Aperture control device, aperture control method, aperture control program, exposure control device, exposure control method, exposure control program, interchangeable lens, camera body, and camera
阅读说明:本技术 光圈控制装置、光圈控制方法、光圈控制程序、曝光控制装置、曝光控制方法、曝光控制程序、可换镜头、相机主体及相机 (Aperture control device, aperture control method, aperture control program, exposure control device, exposure control method, exposure control program, interchangeable lens, camera body, and camera ) 是由 宫田真彦 于 2019-01-29 设计创作,主要内容包括:本发明提供一种能够在短时间内准确地设定为目标开口直径的光圈控制装置、光圈控制方法、光圈控制程序、曝光控制装置、曝光控制方法、曝光控制程序、可换镜头、相机主体及相机。在将光圈设定为目标开口直径的情况下,将以第1速度驱动光圈马达时成为目标开口直径的光圈马达的驱动停止位置设为A,将以快于第1速度的第2速度驱动光圈马达(36)达到目标开口直径时产生的开口直径的偏差幅度设为X。将光圈马达的驱动停止位置设为A,驱动开始至位置P为止的区间以第2速度驱动,位置P之后的区间以第1速度驱动。位置P设定为(A-X/2)的位置。(The invention provides a diaphragm control device, a diaphragm control method, a diaphragm control program, an exposure control device, an exposure control method, an exposure control program, an interchangeable lens, a camera body, and a camera, which can accurately set a target aperture diameter in a short time. When the diaphragm is set to a target aperture diameter, A is the stop position of the diaphragm motor that is set to the target aperture diameter when the diaphragm motor is driven at the 1 st speed, and X is the deviation width of the aperture diameter that occurs when the diaphragm motor (36) is driven at the 2 nd speed that is faster than the 1 st speed and reaches the target aperture diameter. The stop position of the diaphragm motor is set to A, the section from the start of driving to the position P is driven at the 2 nd speed, and the section following the position P is driven at the 1 st speed. The position P is set to the position of (A-X/2).)
1. An aperture control device is provided with:
a driving condition setting unit that sets a driving condition of the actuator for the aperture required to reach the set target aperture diameter; and
a drive control unit that drives the actuator under the set drive condition,
when a drive stop position of the actuator, which is a target opening diameter when the actuator is driven at a 1 st speed, is set to A, and a deviation width of the opening diameter, which is generated when the actuator is driven at a 2 nd speed faster than the 1 st speed to reach the target opening diameter, is set to X, the drive condition setting unit sets the drive stop position of the actuator to A, and sets at least a section following (A-X/2) as a low-speed drive section to be driven at the 1 st speed, and a section preceding the low-speed drive section to be driven at the 2 nd speed.
2. The aperture control device according to claim 1,
the driving condition setting unit determines whether or not a deviation width of an opening diameter generated when the actuator is driven at the 2 nd speed is within an allowable range, and sets the actuator to be driven at the 2 nd speed when the deviation width is within the allowable range.
3. The aperture control device according to claim 2,
the aperture control device further includes:
an operation speed setting unit that sets an operation speed of the diaphragm,
the driving condition setting unit sets the actuator to be driven at the 1 st speed when the set operating speed of the diaphragm is low.
4. The aperture control device according to claim 3,
the operation speed setting unit sets the diaphragm to operate at a low speed when the amount of change in the aperture diameter is equal to or less than a 1 st threshold value.
5. The aperture control device according to any one of claims 1 to 4,
the aperture control device further includes:
and a drive speed setting unit that sets the 1 st speed and the 2 nd speed.
6. An interchangeable lens comprising the aperture control device according to any one of claims 1 to 5.
7. A camera body mounting the interchangeable lens according to claim 6.
8. The camera body according to claim 7,
the camera body further includes:
an exposure start condition setting unit that sets an exposure start condition; and
an exposure control unit that starts exposure under a set start condition after the actuator stops driving,
when the speed before the actuator stops driving is equal to or higher than the 2 nd threshold, the exposure start condition setting unit sets the waiting time during a period from when the actuator stops driving to when the exposure is started.
9. The camera body according to claim 8,
the exposure start condition setting unit sets the waiting time during a period from when the actuator stops driving to when the actuator starts driving, when a speed before the actuator stops driving is equal to or higher than a 2 nd threshold value and a maximum variation amount of an aperture diameter of the diaphragm after the actuator stops driving is equal to or higher than a 3 rd threshold value.
10. The camera body according to claim 8,
the exposure start condition setting unit sets the waiting time during a period from when the actuator stops driving to when the actuator starts exposure when the speed before the actuator stops driving is equal to or higher than a 2 nd threshold and the exposure time is equal to or lower than a 4 th threshold.
11. The camera body according to claim 8,
the exposure start condition setting unit sets the waiting time during a period from when the actuator stops driving to when the actuator starts driving, when a speed before the actuator stops driving is equal to or higher than a 2 nd threshold, a maximum variation amount of an aperture diameter of the diaphragm after the actuator stops driving is equal to or higher than a 3 rd threshold, and an exposure time is equal to or lower than a 4 th threshold.
12. The camera body according to claim 10 or 11,
1/2, which is the period of fluctuation of the aperture diameter of the diaphragm after the actuator stops driving, is set as the 4 th threshold value.
13. The camera body according to any one of claims 8 to 12,
the waiting time is set to a time from when the actuator stops driving until the variation in the aperture diameter of the diaphragm converges to a constant value or less.
14. A camera provided with the aperture control device according to any one of claims 1 to 5.
15. The camera according to claim 14, wherein,
the camera is also provided with:
an exposure start condition setting unit that sets an exposure start condition; and
an exposure control unit that starts exposure under a set start condition after the actuator stops driving,
when the speed before the actuator stops driving is equal to or higher than the 2 nd threshold, the exposure start condition setting unit sets the waiting time during a period from when the actuator stops driving to when the exposure is started.
16. The camera according to claim 15, wherein,
the exposure start condition setting unit sets the waiting time during a period from when the actuator stops driving to when the actuator starts driving, when a speed before the actuator stops driving is equal to or higher than a 2 nd threshold value and a maximum variation amount of an aperture diameter of the diaphragm after the actuator stops driving is equal to or higher than a 3 rd threshold value.
17. The camera according to claim 15, wherein,
the exposure start condition setting unit sets the waiting time during a period from when the actuator stops driving to when the actuator starts exposure when the speed before the actuator stops driving is equal to or higher than a 2 nd threshold and the exposure time is equal to or lower than a 4 th threshold.
18. The camera according to claim 15, wherein,
the exposure start condition setting unit sets the waiting time during a period from when the actuator stops driving to when the actuator starts driving, when a speed before the actuator stops driving is equal to or higher than a 2 nd threshold, a maximum variation amount of an aperture diameter of the diaphragm after the actuator stops driving is equal to or higher than a 3 rd threshold, and an exposure time is equal to or lower than a 4 th threshold.
19. The camera of claim 17 or 18,
1/2, which is the period of fluctuation of the aperture diameter of the diaphragm after the actuator stops driving, is set as the 4 th threshold value.
20. The camera of any of claims 15 to 19,
the waiting time is set to a time from when the actuator stops driving until the variation in the aperture diameter of the diaphragm converges to a constant value or less.
21. An exposure control device includes:
a driving condition setting unit that sets a driving condition of the actuator for the aperture required to reach the set target aperture diameter;
a drive control unit that drives the actuator under the set drive condition;
an exposure start condition setting unit that sets an exposure start condition; and
an exposure control unit that starts exposure under a set start condition after the actuator stops driving,
when the speed before the actuator stops driving is equal to or higher than the 5 th threshold, the exposure start condition setting unit sets a waiting time during a period from when the actuator stops driving to when the exposure is started.
22. The exposure control apparatus according to claim 21, wherein,
the exposure start condition setting unit sets the waiting time during a period from when the actuator stops driving to when the actuator starts driving, when a speed before the actuator stops driving is equal to or higher than a 5 th threshold value and a maximum variation amount of an aperture diameter of the diaphragm after the actuator stops driving is equal to or higher than a 6 th threshold value.
23. The exposure control apparatus according to claim 21, wherein,
the exposure start condition setting unit sets the waiting time during a period from when the actuator stops driving to when the actuator starts exposure when the speed before the actuator stops driving is equal to or higher than a 5 th threshold and the exposure time is equal to or lower than a 7 th threshold.
24. The exposure control apparatus according to claim 21, wherein,
the exposure start condition setting unit sets the waiting time during a period from when the actuator stops driving to when the actuator starts driving, when a speed before the actuator stops driving is equal to or higher than a 5 th threshold, a maximum variation amount of an aperture diameter of the diaphragm after the actuator stops driving is equal to or higher than a 6 th threshold, and an exposure time is equal to or lower than a 7 th threshold.
25. The exposure control apparatus according to claim 23 or 24, wherein,
1/2, which is the period of fluctuation of the aperture diameter of the diaphragm after the actuator stops driving, is set as the 7 th threshold value.
26. The exposure control apparatus according to any one of claims 21 to 25, wherein,
the waiting time is set to a time from when the actuator stops driving until the variation in the aperture diameter of the diaphragm converges to a constant value or less.
27. A camera body provided with the exposure control device according to any one of claims 21 to 26.
28. A camera provided with the exposure control device according to any one of claims 21 to 26.
29. An aperture control method, comprising the steps of:
setting a target aperture diameter of the diaphragm;
setting a driving condition of an actuator of the diaphragm required for reaching the set target aperture diameter, and setting a driving stop position of the actuator to be a target aperture diameter when the actuator is driven at a 1 st speed as a, and setting a deviation width of an aperture diameter generated when the actuator is driven at a 2 nd speed faster than the 1 st speed to be a target aperture diameter as X, and setting a section after at least (a-X/2) as a low-speed driving section to be driven at the 1 st speed, and a section before the low-speed driving section to be driven at the 2 nd speed; and
and driving the actuator under the set driving condition to operate the diaphragm.
30. An aperture control program that causes a computer to realize the following functions:
a function of setting a target aperture diameter of the diaphragm;
a function of setting a driving condition of an actuator of the diaphragm required to reach the set target aperture diameter, setting a driving stop position of the actuator to be a target aperture diameter when the actuator is driven at a 1 st speed as a, and setting a deviation width of an aperture diameter generated when the actuator is driven at a 2 nd speed faster than the 1 st speed to reach the target aperture diameter as X, setting the driving stop position of the actuator to be a, and setting a section at least after (a-X/2) as a low-speed driving section to be driven at the 1 st speed and a section before the low-speed driving section to be driven at the 2 nd speed; and
and a function of driving the actuator under the set driving condition to operate the diaphragm.
31. A recording medium that is a nonvolatile and computer-readable recording medium, and causes a computer to realize an aperture control function in a case where an instruction stored in the recording medium is read by the computer, the aperture control function comprising:
a function of setting a target aperture diameter of the diaphragm;
a function of setting a driving condition of an actuator of the diaphragm required to reach the set target aperture diameter, setting a driving stop position of the actuator to be a target aperture diameter when the actuator is driven at a 1 st speed as a, and setting a deviation width of an aperture diameter generated when the actuator is driven at a 2 nd speed faster than the 1 st speed to reach the target aperture diameter as X, setting the driving stop position of the actuator to be a, and setting a section at least after (a-X/2) as a low-speed driving section to be driven at the 1 st speed and a section before the low-speed driving section to be driven at the 2 nd speed; and
and a function of driving the actuator under the set driving condition to operate the diaphragm.
32. An exposure control method, comprising the steps of:
setting a target aperture diameter of the diaphragm;
setting a driving condition of an actuator of the diaphragm required to reach the set target aperture diameter;
setting a start condition of exposure and setting a waiting time from when the actuator stops driving to when the actuator starts exposure when a speed before the actuator stops driving is equal to or higher than a 5 th threshold;
driving the actuator under the set driving condition to operate the diaphragm; and
and starting exposure under the set start condition after the actuator stops driving.
33. An exposure control program that causes a computer to realize the following functions:
a function of setting a target aperture diameter of the diaphragm;
a function of setting a driving condition of an actuator of the diaphragm required to reach the set target aperture diameter;
a function of setting a condition for starting exposure and setting a waiting time during a period from when the actuator stops driving to when the actuator starts exposure when a speed before the actuator stops driving is equal to or higher than a 5 th threshold;
a function of driving the actuator under the set driving condition to operate the diaphragm; and
a function of starting exposure with the set start condition after the actuator stops driving.
34. A recording medium that is a nonvolatile and computer-readable recording medium and causes a computer to realize an exposure control function in the case where an instruction stored in the recording medium is read by the computer, the exposure control function comprising:
a function of setting a target aperture diameter of the diaphragm;
a function of setting a driving condition of an actuator of the diaphragm required to reach the set target aperture diameter;
a function of setting a condition for starting exposure and setting a waiting time during a period from when the actuator stops driving to when the actuator starts exposure when a speed before the actuator stops driving is equal to or higher than a 5 th threshold;
a function of driving the actuator under the set driving condition to operate the diaphragm; and
a function of starting exposure with the set start condition after the actuator stops driving.
Technical Field
The present invention relates to a diaphragm control device, a diaphragm control method, a diaphragm control program, an exposure control device, an exposure control method, an exposure control program, an interchangeable lens, a camera body, and a camera, in which an aperture diameter is changed by driving an actuator.
Background
An iris diaphragm is generally used as the diaphragm of a camera lens. This variable aperture is known to produce a difference in the actual aperture diameter (aperture value) depending on the driving speed of the actuator.
Patent document 1 proposes the following: in order to prevent a difference in the actual opening diameter from occurring according to the driving speed of the actuator, the driving amount is corrected according to the driving speed of the actuator. Patent document 1 also proposes the following: in the case of performing deceleration control on the actuator, the driving amount is corrected in accordance with the deceleration rate of the actuator.
Prior art documents
Patent document
Patent document 1: japanese laid-open patent publication No. 2012-013896
Disclosure of Invention
Technical problem to be solved by the invention
Even when driven under the same conditions, the iris diaphragm has a disadvantage that the aperture diameter actually obtained is deviated. This deviation can be suppressed by driving at a low speed, but driving at a low speed has a disadvantage that the time required until the diaphragm operation is completed becomes long. Further, although the deviation can be suppressed by performing deceleration control on the actuator as in patent document 1, there is a disadvantage that the deviation cannot be suppressed properly if the deceleration is performed uniformly as in patent document 1.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a diaphragm control device, a diaphragm control method, a diaphragm control program, an exposure control device, an exposure control method, an exposure control program, an interchangeable lens, a camera body, and a camera, which can accurately set a target aperture diameter in a short time.
Means for solving the technical problem
The means for solving the above problems are as follows.
(1) An aperture control device is provided with: a driving condition setting unit that sets a driving condition of the actuator for the aperture required to reach the set target aperture diameter; and a drive control unit that drives the actuator under the set drive condition, wherein when a drive stop position of the actuator that becomes the target opening diameter when the actuator is driven at the 1 st speed is defined as A, and a deviation width of the opening diameter generated when the actuator is driven at the 2 nd speed faster than the 1 st speed to reach the target opening diameter is defined as X, the drive condition setting unit sets the drive stop position of the actuator as A, and sets a section at least after (A-X/2) as a low-speed drive section to be driven at the 1 st speed, and a section before the low-speed drive section to be driven at the 2 nd speed.
According to this aspect, the actuator is driven at a low speed (1 st speed) in a certain section before the stop of the driving. The drive stop position of the actuator is set to a. This position a is a drive stop position of the actuator that is the target opening diameter when the actuator is driven at a low speed (1 st speed). A section in which the actuator is driven at a low speed (1 st speed) is set as a low-speed driving section. At least the section following (A-X/2) is secured as the low-speed drive section. X is the deviation width of the opening diameter generated when the actuator is driven at a high speed (2 nd speed) to reach the target opening diameter. That is, the speed is reduced at least at a position forward of half (1/2) of the deviation width X, and the low-speed drive is performed. This makes it possible to realize a deviation equivalent to that in the case of driving at a low speed, and to accurately set the target opening diameter. Further, by limiting the section driven at a low speed to a certain section, the target opening diameter can be set in a short time.
(2) The diaphragm control device according to the above (1), wherein the driving condition setting unit determines whether or not a deviation width of the aperture diameter generated when the actuator is driven at the 2 nd speed is within an allowable range, and sets the actuator to be driven at the 2 nd speed when the deviation width is within the allowable range.
According to the present aspect, the driving condition is switched depending on whether or not the magnitude of deviation of the opening diameter generated when the actuator is driven at a high speed (2 nd speed) is within the allowable range. In the case where the deviation width is within the allowable range, it is set to drive the actuator at a high speed (2 nd speed). In other words, when the deviation width exceeds the allowable range, the drive control of (1) above is performed. In the case where the deviation width is within the allowable range even if the driving at the high speed (2 nd speed), it is set that the low-speed driving section is not provided, and the actuator is driven at the high speed (2 nd speed). On the other hand, when the deviation width exceeds the allowable range during driving at a high speed (2 nd speed), the driving control of (1) above is performed to suppress the occurrence of the deviation. Thus, the actuator for controlling the diaphragm can be appropriately driven in accordance with the required accuracy of the aperture diameter.
(3) The aperture control device according to the above (2), further comprising: and an operation speed setting unit that sets an operation speed of the diaphragm, wherein the driving condition setting unit is configured to drive the actuator at the 1 st speed when the set operation speed of the diaphragm is low.
According to this aspect, the operating speed of the diaphragm can be set, and when the set operating speed of the diaphragm is low, it is set that the actuator is always driven at a low speed (1 st speed).
(4) The stop control device according to the above (3), wherein the operation speed setting unit sets the stop to operate at a low speed when the amount of change in the aperture diameter is equal to or less than the 1 st threshold value.
According to this aspect, when the amount of change in the aperture diameter is equal to or less than the 1 st threshold, the diaphragm is set to operate at a low speed. When the amount of change in the opening diameter is small, the amount of driving of the actuator is small, and therefore, even if the actuator is driven at high speed, the effect of shortening the driving time is small. Therefore, in this case, the diaphragm is set to operate at a low speed.
(5) The aperture control device according to any one of the above (1) to (4), further comprising: and a drive speed setting unit for setting the 1 st speed and the 2 nd speed.
According to this embodiment, the 1 st speed and the 2 nd speed can be set. In this case, the 2 nd speed is also always faster than the 1 st speed. That is, the 1 st speed is not faster than the 2 nd speed.
(6) An interchangeable lens comprising the aperture control device according to any one of (1) to (5) above.
According to this aspect, the stop control device according to any one of (1) to (5) is provided in an interchangeable lens of a lens interchangeable camera.
(7) A camera body to which the interchangeable lens according to (6) above is attached.
According to this aspect, in the lens interchangeable camera, the interchangeable lens of (6) above is attached to the camera body. That is, the interchangeable lens provided with the aperture control device according to any one of the above (1) to (5) is attached to the camera body.
(8) The camera body according to the above (7), further comprising: an exposure start condition setting unit that sets an exposure start condition; and an exposure control unit that starts exposure under the set start condition after the actuator stops driving, wherein the exposure start condition setting unit sets a waiting time during a period from when the actuator stops driving to when the speed before the actuator stops driving is equal to or greater than a 2 nd threshold value.
According to this aspect, when the speed of the actuator that drives the diaphragm before stopping driving is equal to or higher than the 2 nd threshold, the waiting time is set during the period from when the actuator stops driving to when the exposure is started. When the speed of the actuator for driving the diaphragm is high before the stop of the driving, a certain time is required until the diaphragm blades completely stop. Therefore, when the speed before the actuator stops driving is high, it is set that a certain waiting time is set after the driving is stopped, and the exposure is started after the waiting time elapses. This enables shooting with accurate exposure. In addition, when the speed before stopping driving is less than the 2 nd threshold, the exposure can be started without waiting time. At this time, the diaphragm blades are stopped in a short time, and therefore, the exposure can be started without waiting time.
(9) The camera body according to the above (8), wherein the exposure start condition setting unit sets the waiting time during a period from when the actuator stops driving to when the exposure is started, when the speed before the actuator stops driving is equal to or higher than the 2 nd threshold value and the maximum variation amount of the aperture diameter of the diaphragm after the actuator stops driving is equal to or higher than the 3 rd threshold value.
According to this aspect, when the speed before the actuator stops driving is equal to or higher than the 2 nd threshold and the maximum variation amount of the aperture diameter of the diaphragm after the actuator stops driving is equal to or higher than the 3 rd threshold, the waiting time is set during the period from the actuator stop driving to the start of exposure. Even in the case where the speed before the actuator stops driving is fast, when the amount of fluctuation of the aperture diameter of the diaphragm is small, the influence on exposure is small. Therefore, in this aspect, the waiting time is set only when the speed before the actuator stops driving is fast and the amount of fluctuation of the aperture diameter of the diaphragm after the actuator stops driving is also large. This enables the time to be set appropriately according to the situation. In addition, the amount of fluctuation of the opening diameter becomes maximum immediately after the actuator stops driving, and converges with time. Therefore, the fluctuation amount here is the fluctuation amount immediately after the stop, that is, the fluctuation amount that becomes maximum (maximum fluctuation amount). The maximum variation is related to the deviation.
(10) The camera body according to the above (8), wherein the exposure start condition setting unit sets the waiting time during a period from when the actuator stops driving to when the exposure time is equal to or greater than the 2 nd threshold and equal to or less than the 4 th threshold.
According to this aspect, when the speed before the actuator stops driving is equal to or higher than the 2 nd threshold and the exposure time is equal to or lower than the 4 th threshold, the waiting time is set during the period from the stop of driving of the actuator to the start of exposure. In the case where the exposure time is long, even if the exposure is started before the diaphragm blades are completely stationary, the influence on the exposure is small. Therefore, in this embodiment, the waiting time is set only when the speed before the actuator stops driving is fast and the exposure time is short. This enables the time to be set appropriately according to the situation.
(11) The camera body according to the above (8), wherein the exposure start condition setting unit sets the waiting time during a period from when the actuator stops driving to when the exposure time is equal to or less than a 4 th threshold value, and when the speed before the actuator stops driving is equal to or more than a 2 nd threshold value, the maximum variation amount of the aperture diameter of the diaphragm after the actuator stops driving is equal to or more than a 3 rd threshold value, and the exposure time is equal to or less than the 2 nd threshold value.
According to this aspect, when the speed before the actuator stops driving is equal to or higher than the 2 nd threshold, the maximum variation amount of the aperture diameter of the diaphragm after the actuator stops driving is equal to or higher than the 3 rd threshold, and the exposure time is equal to or lower than the 4 th threshold, the waiting time is set during the period from the actuator stopping driving to the start of exposure. This enables the time to be set appropriately according to the situation.
(12) The camera body according to the above (10) or (11), wherein 1/2, which is a period of fluctuation of the aperture diameter of the diaphragm after the actuator stops driving, is set as a 4 th threshold value.
According to this embodiment, 1/2, which is the period of fluctuation of the aperture diameter of the diaphragm after the actuator stops driving, is set as the 4 th threshold. That is, whether or not the waiting time is set is determined based on whether or not the exposure time is below 1/2 of the period of fluctuation of the aperture diameter. Thus, whether or not the waiting time is set can be appropriately determined.
(13) The camera body according to any one of the above (8) to (12), wherein a time from when the actuator stops driving until a variation in the aperture diameter of the diaphragm converges to a certain value or less is taken as the waiting time.
According to this aspect, the waiting time is set to a time from when the actuator stops driving until the variation in the aperture diameter of the diaphragm converges to a certain value or less. This enables the time to be set as the waiting time.
(14) A camera provided with the aperture control device according to any one of the above (1) to (5).
According to this aspect, the aperture control device according to any one of (1) to (5) above is provided in a camera.
(15) The camera according to the above (14), further comprising: an exposure start condition setting unit that sets an exposure start condition; and an exposure control unit that starts exposure under the set start condition after the actuator stops driving, wherein the exposure start condition setting unit sets a waiting time during a period from when the actuator stops driving to when the speed before the actuator stops driving is equal to or greater than a 2 nd threshold value.
According to this aspect, when the speed of the actuator that drives the diaphragm before stopping driving is equal to or higher than the 2 nd threshold, the waiting time is set during the period from when the actuator stops driving to when the exposure is started. When the speed of the actuator for driving the diaphragm is high before the stop of the driving, a certain time is required until the diaphragm blades completely stop. Therefore, when the speed before the actuator stops driving is high, it is set that a certain waiting time is set after the driving is stopped, and the exposure is started after the waiting time elapses. This enables shooting with accurate exposure. In addition, when the speed before stopping driving is less than the 2 nd threshold, the exposure can be started without waiting time. At this time, the diaphragm blades are stopped in a short time, and therefore, the exposure can be started without waiting time.
(16) The camera according to the above (15), wherein the exposure start condition setting unit sets the waiting time during a period from when the actuator stops driving to when the exposure is started, when the speed before the actuator stops driving is equal to or higher than the 2 nd threshold value and the maximum variation amount of the aperture diameter of the diaphragm after the actuator stops driving is equal to or higher than the 3 rd threshold value.
According to this aspect, when the speed before the actuator stops driving is equal to or higher than the 2 nd threshold and the maximum variation amount of the aperture diameter of the diaphragm after the actuator stops driving is equal to or higher than the 3 rd threshold, the waiting time is set during the period from the actuator stop driving to the start of exposure. Even in the case where the speed before the actuator stops driving is fast, when the amount of variation in the aperture diameter of the diaphragm is small, the diaphragm blades are stationary for a short time after the actuator stops driving. Therefore, in this aspect, the waiting time is set only when the speed before the actuator stops driving is fast and the amount of fluctuation of the aperture diameter of the diaphragm after the actuator stops driving is also large. This enables the time to be set appropriately according to the situation.
(17) The camera according to the above (15), wherein the exposure start condition setting unit sets the waiting time during a period from when the actuator stops driving to when the exposure time is equal to or greater than a 2 nd threshold value and equal to or less than a 4 th threshold value.
According to this aspect, when the speed before the actuator stops driving is equal to or higher than the 2 nd threshold and the exposure time is equal to or lower than the 4 th threshold, the waiting time is set during the period from the stop of driving of the actuator to the start of exposure. In the case where the exposure time is long, even if the exposure is started before the diaphragm blades are completely stationary, the influence on the exposure is small. Therefore, in this embodiment, the waiting time is set only when the speed before the actuator stops driving is fast and the exposure time is short. This enables the time to be set appropriately according to the situation.
(18) The camera according to the above (15), wherein the exposure start condition setting unit sets the waiting time during a period from when the actuator stops driving to when the exposure time is equal to or less than a 4 th threshold value, when the speed before the actuator stops driving is equal to or more than a 2 nd threshold value, the maximum variation amount of the aperture diameter of the diaphragm after the actuator stops driving is equal to or more than a 3 rd threshold value, and the exposure time is equal to or less than the 2 nd threshold value.
According to this aspect, when the speed before the actuator stops driving is equal to or higher than the 2 nd threshold, the maximum variation amount of the aperture diameter of the diaphragm after the actuator stops driving is equal to or higher than the 3 rd threshold, and the exposure time is equal to or lower than the 4 th threshold, the waiting time is set during the period from the actuator stopping driving to the start of exposure. This enables the time to be set appropriately according to the situation.
(19) The camera according to the above (17) or (18), wherein 1/2, which is a period of fluctuation of the aperture diameter of the diaphragm after the actuator stops driving, is set as a 4 th threshold value.
According to this embodiment, 1/2, which is the period of fluctuation of the aperture diameter of the diaphragm after the actuator stops driving, is set as the 4 th threshold. That is, whether or not the waiting time is set is determined based on whether or not the exposure time is below 1/2 of the period of fluctuation of the aperture diameter. Thus, whether or not the waiting time is set can be appropriately determined.
(20) The camera according to any one of the above (15) to (19), wherein a time from when the actuator stops driving until a variation in an aperture diameter of the diaphragm converges to a certain value or less is taken as the waiting time.
According to this aspect, the waiting time is set to a time from when the actuator stops driving until the variation in the aperture diameter of the diaphragm converges to a certain value or less. This enables the time to be set as the waiting time.
(21) An exposure control device includes: a driving condition setting unit that sets a driving condition of the actuator for the aperture required to reach the set target aperture diameter; a drive control unit that drives the actuator under the set drive condition; an exposure start condition setting unit that sets an exposure start condition; and an exposure control unit that starts exposure under the set start condition after the actuator stops driving, wherein the exposure start condition setting unit sets a waiting time during a period from when the actuator stops driving to when the speed before the actuator stops driving is equal to or greater than a 5 th threshold.
According to this aspect, the driving condition of the actuator of the diaphragm is set by the driving condition setting unit. When the set speed before the actuator stops driving is equal to or higher than the 5 th threshold, a waiting time is set during a period from when the actuator stops driving to when exposure is started. When the speed of the actuator for driving the diaphragm is high before the stop of the driving, a certain time is required until the diaphragm blades completely stop. Therefore, when the speed before the actuator stops driving is high, it is set that a certain waiting time is set after the driving is stopped, and the exposure is started after the waiting time elapses. This enables shooting with accurate exposure. In addition, when the speed before stopping driving is less than the 5 th threshold, the exposure can be started without waiting time. At this time, the diaphragm blades are stopped in a short time, and therefore, the exposure can be started without waiting time.
(22) The exposure control device according to the above (21), wherein the exposure start condition setting unit sets the waiting time during a period from when the actuator stops driving to when the exposure is started, when the speed before the actuator stops driving is equal to or higher than a 5 th threshold value and the maximum variation amount of the aperture diameter of the diaphragm after the actuator stops driving is equal to or higher than a 6 th threshold value.
According to this aspect, when the set speed before the actuator stops driving is equal to or higher than the 5 th threshold and the maximum variation amount of the aperture diameter of the diaphragm after the actuator stops driving is equal to or higher than the 6 th threshold, the waiting time is set during the period from the actuator stop driving to the start of exposure. Even in the case where the speed before the actuator stops driving is fast, when the amount of fluctuation of the aperture diameter of the diaphragm is small, the influence on exposure is small. Therefore, in this aspect, the waiting time is set only when the speed before the actuator stops driving is fast and the maximum variation amount of the aperture diameter of the diaphragm after the actuator stops driving is also large. This enables the time to be set appropriately according to the situation.
(23) The exposure control device according to the above (21), wherein the exposure start condition setting unit sets the waiting time during a period from when the actuator stops driving to when the exposure time is equal to or greater than a 5 th threshold and equal to or less than a 7 th threshold.
According to this aspect, when the set speed before the actuator stops driving is equal to or higher than the 5 th threshold and the exposure time is equal to or lower than the 7 th threshold, the waiting time is set during the period from when the actuator stops driving to when the exposure is started. In the case where the exposure time is long, even if the exposure is started before the diaphragm blades are completely stationary, the influence on the exposure is small. Therefore, in this embodiment, the waiting time is set only when the speed before the actuator stops driving is fast and the exposure time is short. This enables the time to be set appropriately according to the situation.
(24) The exposure control device according to the above (21), wherein the exposure start condition setting unit sets the waiting time during a period from when the actuator stops driving to when the exposure time is equal to or less than a 7 th threshold value, and wherein the speed before the actuator stops driving is equal to or more than a 5 th threshold value, and the maximum variation amount of the aperture diameter of the diaphragm after the actuator stops driving is equal to or more than a 6 th threshold value.
According to this aspect, when the set speed before the actuator stops driving is equal to or higher than the 5 th threshold, the maximum variation amount of the aperture diameter of the diaphragm after the actuator stops driving is equal to or higher than the 6 th threshold, and the exposure time is equal to or lower than the 7 th threshold, the waiting time is set during the period from the actuator stopping driving to the start of exposure. This enables the time to be set appropriately according to the situation.
(25) The exposure control apparatus according to the above (23) or (24), wherein 1/2, which is a period of fluctuation of the aperture diameter of the diaphragm after the actuator stops driving, is set as a 7 th threshold value.
According to this embodiment, 1/2, which is the period of fluctuation of the aperture diameter of the diaphragm after the actuator stops driving, is set as the 7 th threshold. That is, whether or not the waiting time is set is determined based on whether or not the exposure time is below 1/2 of the period of fluctuation of the aperture diameter. Thus, whether or not the waiting time is set can be appropriately determined.
(26) The exposure control apparatus according to any one of the above (21) to (25), wherein a time from when the actuator stops driving until a variation in the aperture diameter of the diaphragm converges to a certain value or less is taken as the waiting time.
According to this aspect, the waiting time is set to a time from when the actuator stops driving until the variation in the aperture diameter of the diaphragm converges to a certain value or less. This enables the time to be set as the waiting time.
(27) A camera body provided with the exposure control device according to any one of the above (21) to (26).
According to this aspect, the exposure control device according to any one of (21) to (26) is provided in a camera body of a lens interchangeable camera.
(28) A camera provided with the exposure control device according to any one of the above items (21) to (26).
According to this aspect, the exposure control device according to any one of (21) to (26) above is provided in a camera.
(29) An aperture control method, comprising the steps of: setting a target aperture diameter of the diaphragm; setting a driving condition of an actuator of a diaphragm required to reach a set target aperture diameter, and setting a driving stop position of the actuator to be a target aperture diameter when the actuator is driven at a 1 st speed as a, and setting a deviation width of the aperture diameter generated when the actuator is driven at a 2 nd speed faster than the 1 st speed to reach the target aperture diameter as X, wherein the driving stop position of the actuator is set to be a, and at least a section following (a-X/2) is set to be driven at the 1 st speed as a low-speed driving section and a section preceding the low-speed driving section is set to be driven at a 2 nd speed; and driving the actuator under the set driving condition to operate the diaphragm.
According to this aspect, the actuator is driven at a low speed (1 st speed) in a certain section before the stop of the driving. The drive stop position of the actuator is set to a. This position a is a drive stop position of the actuator that is the target opening diameter when the actuator is driven at a low speed (1 st speed). A section in which the actuator is driven at a low speed (1 st speed) is set as a low-speed driving section. At least the section following (A-X/2) is secured as the low-speed drive section. X is the deviation width of the opening diameter generated when the actuator is driven at a high speed (2 nd speed) to reach the target opening diameter. That is, the speed is reduced at least at a position forward of half (1/2) of the deviation width X, and the low-speed drive is performed. This makes it possible to realize a deviation equivalent to that in the case of driving at a low speed, and to accurately set the target opening diameter. Further, by limiting the section driven at a low speed to a certain section, the target opening diameter can be set in a short time.
(30) An aperture control program that causes a computer to realize the following functions: a function of setting a target aperture diameter of the diaphragm; a function of setting a driving condition of an actuator of a diaphragm required to reach a set target aperture diameter, and setting a driving stop position of the actuator as a, and setting a section at least after (a-X/2) as a low-speed driving section to be driven at a 1 st speed and a section before the low-speed driving section to be driven at a 2 nd speed, when a driving stop position of the actuator which becomes the target aperture diameter when the actuator is driven at the 1 st speed is set as a, and a deviation width of the aperture diameter generated when the actuator is driven at the 2 nd speed faster than the 1 st speed is set as X; and a function of driving the actuator to operate the diaphragm under the set driving condition.
According to this aspect, the actuator is driven at a low speed (1 st speed) in a certain section before the stop of the driving. The drive stop position of the actuator is set to a. This position a is a drive stop position of the actuator that is the target opening diameter when the actuator is driven at a low speed (1 st speed). A section in which the actuator is driven at a low speed (1 st speed) is set as a low-speed driving section. At least the section following (A-X/2) is secured as the low-speed drive section. X is the deviation width of the opening diameter generated when the actuator is driven at a high speed (2 nd speed) to reach the target opening diameter. That is, the speed is reduced at least at a position forward of half (1/2) of the deviation width X, and the low-speed drive is performed. This makes it possible to realize a deviation equivalent to that in the case of driving at a low speed, and to accurately set the target opening diameter. Further, by limiting the section driven at a low speed to a certain section, the target opening diameter can be set in a short time.
(31) An exposure control method, comprising the steps of: setting a target aperture diameter of the diaphragm; setting a driving condition of an actuator of the diaphragm required to reach the set target aperture diameter; setting a condition for starting exposure and setting a waiting time from when the actuator stops driving to when the actuator starts exposure when the speed before the actuator stops driving is not less than a 5 th threshold; driving an actuator under the set driving condition to operate the diaphragm; and starting exposure under the set start condition after the actuator stops driving.
According to this aspect, first, the target aperture diameter of the diaphragm is set. Next, the driving conditions of the actuator for the diaphragm required to reach the set target aperture diameter are set. Next, the exposure start condition is set based on the set driving condition of the actuator of the diaphragm, and the waiting time is set as necessary. That is, it is determined whether or not the set speed before the actuator stops driving is equal to or higher than the 5 th threshold, and if the speed is equal to or higher than the 5 th threshold, the waiting time is set during the period from the actuator stopping driving to the start of exposure. Then, the actuator is driven under the set driving conditions to set the diaphragm to the target aperture diameter. The exposure is started after the actuator of the diaphragm stops driving. At this time, when the waiting time is set, exposure is started after the waiting time elapses.
(32) An exposure control program that causes a computer to realize the following functions: a function of setting a target aperture diameter of the diaphragm; a function of setting a driving condition of an actuator of the diaphragm required to reach the set target aperture diameter; a function of setting a waiting time from the stop of the driving of the actuator to the start of the exposure when a speed before the stop of the driving of the actuator is equal to or higher than a 5 th threshold value; a function of driving the actuator to operate the diaphragm under the set driving condition; and a function of starting exposure under the set start condition after the actuator stops driving.
According to this aspect, first, the target aperture diameter of the diaphragm is set. Next, the driving conditions of the actuator for the diaphragm required to reach the set target aperture diameter are set. Next, the exposure start condition is set based on the set driving condition of the actuator of the diaphragm, and the waiting time is set as necessary. That is, it is determined whether or not the set speed before the actuator stops driving is equal to or higher than the 5 th threshold, and if the speed is equal to or higher than the 5 th threshold, the waiting time is set during the period from the actuator stopping driving to the start of exposure. Then, the actuator is driven under the set driving conditions to set the diaphragm to the target aperture diameter. The exposure is started after the actuator of the diaphragm stops driving. At this time, when the waiting time is set, exposure is started after the waiting time elapses.
Effects of the invention
According to the present invention, the target opening diameter can be accurately set in a short time.
Drawings
Fig. 1 is a front perspective view showing an embodiment of a camera according to the present invention.
Fig. 2 is a rear perspective view showing an embodiment of a camera according to the present invention.
Fig. 3 is a block diagram showing an electrical configuration of the camera.
Fig. 4 is a block diagram showing an electrical configuration of the interchangeable lens.
Fig. 5 is a diagram showing a schematic configuration of the light amount adjustment mechanism.
Fig. 6 is a block diagram of main functions implemented by the camera microcomputer.
Fig. 7 is a conceptual diagram of drive control of the aperture motor.
Fig. 8 is a block diagram of functions of the aperture control device.
Fig. 9 is a graph showing a relationship between the aperture diameter of the diaphragm and the magnitude of deviation.
Fig. 10 is a flowchart showing a procedure of setting the driving conditions of the aperture motor in the aperture control device.
Fig. 11 is a block diagram of functions of the aperture control device.
Fig. 12 is a flowchart showing a procedure of setting the driving conditions of the aperture motor in the aperture control device.
Fig. 13 is a graph showing the transition of the fluctuation of the aperture diameter after the stop of the driving of the aperture motor.
Fig. 14 is a block diagram of functions of the exposure control apparatus.
Fig. 15 is a flowchart showing an exposure control procedure.
Fig. 16 is a flowchart showing an exposure control procedure.
Fig. 17 is a flowchart showing an exposure control procedure.
Fig. 18 is a flowchart showing an exposure control procedure.
Fig. 19 is a flowchart showing a processing procedure when the waiting time is set based on the speed and the exposure time before the stop of the driving of the aperture motor.
Fig. 20 is a graph showing the transition of the fluctuation of the aperture diameter after the stop of the driving of the aperture motor.
Detailed Description
Hereinafter, preferred embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.
Diamond 1. first embodiment diamond solid
[ appearance Structure ]
Fig. 1 is a front perspective view showing an embodiment of a camera according to the present invention. Fig. 2 is a rear perspective view showing an embodiment of a camera according to the present invention.
The camera 1 shown in fig. 1 and 2 is a lens-interchangeable digital camera, and includes an
Interchangeable lens
The
The lens mount is a mount for the
The
The focus ring 16 is an operation member for focus adjustment. The focus ring 16 is rotatably provided around the lens barrel 12. When the focus ring 16 is rotated, the focus adjustment mechanism operates according to the operation direction and the operation amount. That is, the focus lens group moves in accordance with the operation direction and the operation amount, and focus adjustment is performed.
The aperture ring 18 is an operation member for setting an aperture. The aperture ring 18 is rotatably provided around the lens barrel 12. The aperture ring 18 has an aperture value (not shown) that can be set printed on its outer periphery at a constant interval. The aperture ring 18 is rotated to align a desired aperture value to a position of an index (not shown) provided in the lens barrel 12, thereby setting an aperture.
Camera body
The
The body mount 102 is a mounting portion for the
The sub-display 106 is disposed on the upper surface of the
An Electronic View Finder (EVF)108 is provided on the upper part of the
The
The
[ Electrical Structure ]
Fig. 3 is a block diagram showing an electrical configuration of the camera.
When the
Interchangeable lens
Fig. 4 is a block diagram showing an electrical configuration of the interchangeable lens.
The
< Focus adjustment mechanism >
The
The
< light quantity adjustment mechanism >
Fig. 5 is a diagram showing a schematic configuration of the light amount adjustment mechanism.
The light
The
The
< lens Microcomputer >
The
The
The
When driving the
Camera body
The
< image sensor >
The
The
< shutter >
The
< analog Signal processing section >
The analog
<ADC>
The ADC222 converts the analog image signal output from the analog
< digital Signal processing section >
The digital
< phase difference AF processing Unit >
The phase difference af (auto focus)
< memory card interface and memory card >
The
< main display >
< sub-display >
The sub-display 106 is constituted by an LCD. The display of the sub-display 106 is controlled by the
< electronic viewfinder >
A display portion of the Electronic Viewfinder (EVF)108 is constituted by an LCD. The display of the
< Camera operating part >
The
< time measurement section >
The
< Camera Microcomputer >
The
Fig. 6 is a block diagram of main functions implemented by the camera microcomputer.
By executing a predetermined program, the
[ Exposure control device ]
The
The aperture value and the shutter speed are determined according to the exposure mode. In the case of aperture priority, the shutter speed for shooting at an appropriate exposure is determined according to the aperture value set by the photographer. In the case where the shutter speed is prioritized, the aperture value for shooting at an appropriate exposure is determined according to the shutter speed set by the photographer. In the case of automation, the aperture value and the shutter speed for photographing at an appropriate exposure are determined according to the brightness of the subject. In the case of manual operation, the aperture value and the shutter speed set by the photographer are set.
The
[ AF control device ]
The
[ recording control device ]
The recording control means 256 controls recording of image data obtained by shooting. The recording control means 256 generates an image file of a predetermined format from image data obtained by shooting, and records it in the
[ main display control device ]
Primary
[ Secondary display control device ]
The sub-display control means 260 controls the display of the sub-display 106. The sub-display control means 260 acquires information displayed in the sub-display 106 and displays the acquired information in a predetermined format in the sub-display 106.
[ EVF display control device ]
The EVF
[ Aperture control ]
As described above, when driving the
Brief summary of the invention
In the camera 1 of the present embodiment, when the
Fig. 7 is a conceptual diagram of drive control of the aperture motor.
The aperture diameter (target aperture diameter) of the
The position at which the
The position P at which the driving speed of the
By setting the driving conditions of the
Aperture control device
Fig. 8 is a block diagram of functions of the aperture control device.
As described above, the
The
< Aperture Motor drive Condition setting section >
The diaphragm motor driving
The stop position a at which the
The stop position of the
The deviation width X of the aperture diameter, which is generated when the
The difference in magnitude between when the
< Aperture Motor drive control Unit >
The diaphragm motor
< storage section for diaphragm control information >
The diaphragm control
Aperture control method based on aperture control device
Next, a method of controlling the
First, information of an aperture value (opening diameter) to be set is acquired. The acquired aperture value (aperture diameter) becomes a target aperture value (target aperture diameter).
When the exposure mode is aperture-priority or manual, the aperture value set by the aperture ring 18 is directly set as the aperture value to be set. In the other mode, the aperture value set on the camera body side is the aperture value to be set. At this time, the
Next, the driving condition of the
Next, the
By driving in this manner, the target opening diameter can be accurately set in a short time.
[ movement of Camera ]
The camera 1 is configured by attaching the
When the focus adjustment mode of the camera 1 is autofocus, if the
When the
The image signal obtained by the exposure is subjected to predetermined signal processing, and recorded in the
[ modified examples ]
Data on the amplitude of deviation
As described above, the data on the deviation width X is obtained in advance for each aperture diameter that can be set by the
In the case of obtaining the deviation width, all the aperture diameters that can be set by the
Fig. 9 is a graph showing a relationship between the aperture diameter of the diaphragm and the magnitude of deviation. In fig. 9, the horizontal axis represents the aperture diameter (aperture value) of the aperture, and the vertical axis represents the deviation width.
As shown in fig. 9, the aperture diameter and the deviation magnitude have a relationship, and the smaller the aperture diameter, the smaller the deviation magnitude (the smaller the aperture, the smaller the deviation magnitude). This is because the smaller the aperture diameter of the
Since the opening diameters and the variation widths have a fixed relationship in this manner, the variation widths can be actually measured for a plurality of opening diameters, and the variation occurrence tendency can be obtained from the measurement results to obtain the variation width of each opening diameter. For example, when the aperture value can be changed to 1/3 steps, the deviation width is obtained for 1 step, and the tendency of occurrence of the deviation is obtained from the measurement result. Then, the deviation width is obtained from the obtained generation tendency with respect to the aperture value between each stage.
Further, the data of the deviation width may be obtained from the generation tendency and held in the form of a function, instead of a table.
Diamond-2 implementation
In the present embodiment, the driving conditions of the
[ Structure ]
The basic configuration of the
The diaphragm motor driving
When the
[ Effect ]
Fig. 10 is a flowchart showing a procedure of setting the driving conditions of the aperture motor in the aperture control device according to the present embodiment.
First, a target aperture diameter is set from the set aperture value (step S1).
Next, information of the deviation width X is acquired from the set target opening diameter (step S2). The deviation width X is a deviation width of the aperture diameter generated when the
Next, it is determined whether the acquired deviation width X is within the allowable range (step S3).
In the case where the acquired deviation width X is within the allowable range (deviation width ≦ allowable range), the driving condition is set to drive the
On the other hand, in the case where the acquired deviation width X is out of the allowable range (deviation width > allowable range), the driving condition is set to decelerate the driving diaphragm motor 36 (step S5). The setting at this time is performed in the same order as that described in embodiment 1 above. That is, the position a at which the target aperture diameter is obtained when the
As described above, in the present embodiment, the driving condition of the
[ modified examples ]
The allowable range may also be variable. For example, as the control mode of the
Diamond-3 implementation
When the
In the diaphragm control device of the present embodiment, the operation speed of the
[ Structure ]
Fig. 11 is a block diagram of functions of the aperture control device according to the present embodiment.
As shown in fig. 11, the
When the amount of change in the aperture value (aperture diameter) is equal to or less than the 1 st threshold, the aperture operation
When the operating speed of the
[ Effect ]
Fig. 12 is a flowchart showing a procedure of setting the driving conditions of the aperture motor in the aperture control device according to the present embodiment.
First, a target aperture diameter (target aperture value) is set from the set aperture value (step S10).
Next, the amount of change in the aperture diameter of the
Next, it is determined whether or not the calculated amount of change in the opening diameter is equal to or less than the 1 st threshold (step S12).
When the amount of change in the aperture diameter is equal to or less than the 1 st threshold (when the amount of change in the aperture diameter is equal to or less than the 1 st threshold), the driving condition is set such that the
On the other hand, when the amount of change in the opening diameter is equal to or less than the 1 st threshold (when the amount of change in the opening diameter > the 1 st threshold), information on the deviation width X is acquired from the set target opening diameter (step S14). The deviation width X is a deviation width of the aperture diameter generated when the
Next, it is determined whether the acquired deviation width X is within the allowable range (step S15).
In the case where the acquired deviation width X is within the allowable range (in the case where the deviation width is ≦ the allowable range), the driving condition is set to drive the
On the other hand, in the case where the acquired deviation width X is out of the allowable range (in the case where the deviation width > the allowable range), the driving condition is set to decelerate the driving diaphragm motor 36 (step S17). The setting at this time is performed in the same order as that described in embodiment 1 above. That is, the position a at which the target aperture diameter is obtained when the
As described above, according to the
[ modified examples ]
In the above embodiment, when the amount of change in the aperture diameter is equal to or less than the 1 st threshold value, the
Further, the operating speed of the
Further, the operating speed of the
Example 4 diamond solid
Fig. 13 is a graph showing the transition of the fluctuation of the aperture diameter after the stop of the driving of the aperture motor. In fig. 13, the horizontal axis represents time, and the vertical axis represents the aperture diameter of the diaphragm.
As shown in fig. 13, when the
The camera of the present embodiment sets a waiting time before starting exposure as necessary. Specifically, information on the driving speed of the
The waiting time is set to a time sufficient for the swing of the diaphragm blades 32a to converge. The 2 nd threshold is appropriately set in consideration of the influence on the exposure. As described above, in the camera of the present embodiment, the
The exposure start condition is set by the
[ Structure ]
Fig. 14 is a block diagram of main functions of the exposure control apparatus according to the present embodiment.
The
Photometry section
The photometry section 252A detects the brightness of the subject from the image signal obtained from the
Exposure setting section
The exposure setting unit 252B sets an aperture value and a shutter speed for shooting at an appropriate exposure based on the photometric result by the photometry unit 252A.
The aperture value and the shutter speed are determined according to the exposure mode. In the case of aperture priority, the shutter speed for shooting at an appropriate exposure is determined according to the aperture value set by the photographer. In the case where the shutter speed is prioritized, the aperture value for shooting at an appropriate exposure is determined according to the shutter speed set by the photographer. In the case of automation, the aperture value and the shutter speed for photographing at an appropriate exposure are determined according to the brightness of the subject. In the case of manual operation, the aperture value and the shutter speed set by the photographer are set.
Exposure Start Condition setting section
The exposure start condition setting unit 252C sets the exposure start condition based on the information of the driving condition of the
In the camera of the present embodiment, since the
Exposure control section
The exposure control unit 252D controls the driving of the
Further, the
As described above, the waiting time is set to a time sufficient for the swing of the diaphragm blades 32a to converge. In the present embodiment, when the
[ Effect ]
Fig. 15 and 16 are flowcharts showing an exposure control procedure.
As shown in fig. 15, first, it is determined whether or not the
When the
When the aperture value is set, the driving condition of the
If the speed of the
On the other hand, when the speed before the stop of the
Then, as shown in fig. 16, it is determined whether or not the
On the other hand, when the
Then, it is determined whether or not the driving of the
Here, if it is determined that the waiting time is set, exposure is started after the waiting time elapses. At this time, when the driving of the
On the other hand, if it is determined that the waiting time is not set, exposure is performed without waiting for the elapse of the waiting time (step S36). That is, exposure is started immediately after the stop of driving of the
As described above, according to the
[ modified examples ]
In the above embodiment, the waiting time is set to have the same length, but the waiting time may be set individually according to the driving conditions of the
Diamond 5 implementation
In the present embodiment, the waiting time is set when the speed before the stop of the
Even if the speed before the stop of the driving of the
[ Structure ]
The basic configuration of the apparatus in the exposure control apparatus according to the present embodiment is the same as that of the exposure control apparatus described in embodiment 4. The exposure start condition setting unit 252C sets the exposure start condition.
The amount of variation in the opening diameter is related to the magnitude of the deviation. The exposure start condition setting unit 252C acquires information of the deviation width of the aperture diameter generated when the
The 3 rd threshold is set in consideration of the influence on the exposure.
[ Effect ]
Fig. 17 and 16 are flowcharts showing an exposure control procedure.
As shown in fig. 17, first, it is determined whether or not the
When the
When the aperture value is set, the driving condition of the
When the speed before the stop of the
Here, the maximum variation amount of the opening diameter is calculated from the information of the deviation width. When the maximum fluctuation amount of the aperture diameter is equal to or greater than the 3 rd threshold (when the maximum fluctuation amount of the aperture diameter is equal to or greater than the 3 rd threshold), a waiting time is set before the exposure is started (step S46).
On the other hand, when the maximum variation amount of the opening diameter is smaller than the 3 rd threshold (when the maximum variation amount of the opening diameter < the 3 rd threshold), the waiting time is not set. In step S44, if it is determined that the speed before the stop of the
Then, as shown in fig. 16, it is determined whether or not the
On the other hand, when the
Then, it is determined whether or not the driving of the
Here, if it is determined that the waiting time is set, exposure is started after the waiting time elapses. At this time, when the driving of the
On the other hand, if it is determined that the waiting time is not set, exposure is performed without waiting for the elapse of the waiting time (step S36). That is, exposure is started immediately after the stop of driving of the
As described above, according to the
Diamond 6 implementation
In the present embodiment, the waiting time is set when the speed before the stop of the
When the exposure time is long, the influence of the fluctuation in the opening amount after the stop of the driving on the exposure is small. Therefore, in this case, the waiting time is not set, and the exposure is started immediately after the stop of the driving of the
[ Structure ]
The basic configuration of the apparatus in the exposure control apparatus according to the present embodiment is the same as that of the exposure control apparatus described in embodiment 4. The exposure start condition setting unit 252C sets the exposure start condition. The exposure start condition setting unit 252C determines whether or not the exposure time is equal to or less than the 4 th threshold value based on the information of the shutter speed set by the exposure setting unit 252B. The 4 th threshold is set in consideration of the influence on the exposure.
[ Effect ]
Fig. 18 and 16 are flowcharts showing an exposure control procedure.
As shown in fig. 18, first, it is determined whether or not the
When the
When the aperture value is set, the driving condition of the
When the speed before the stop of the
When the maximum fluctuation amount of the aperture diameter is equal to or greater than the 3 rd threshold (when the maximum fluctuation amount of the aperture diameter is equal to or greater than the 3 rd threshold), it is also determined whether the exposure time is equal to or less than the 4 th threshold (step S56). If the exposure time (shutter speed) is equal to or less than the 4 th threshold (if the exposure time is equal to or less than the 4 th threshold), a waiting time is set before the exposure is started (step S57).
On the other hand, in the case where the exposure time is greater than the 4 th threshold (in the case where the exposure time > the 4 th threshold), the waiting time is not set. In step S55, if it is determined that the maximum variation of the opening diameter is smaller than the 3 rd threshold (maximum variation of the opening diameter < the 3 rd threshold), the waiting time is not set. Similarly, in step S44, when it is determined that the speed before the stop of the driving of the
Then, as shown in fig. 16, it is determined whether or not the
On the other hand, when the
Then, it is determined whether or not the driving of the
Here, if it is determined that the waiting time is set, exposure is started after the waiting time elapses. At this time, when the driving of the
On the other hand, if it is determined that the waiting time is not set, exposure is performed without waiting for the elapse of the waiting time (step S36). That is, exposure is started immediately after the stop of driving of the
As described above, according to the
[ modified examples ]
Determination of whether or not to set waiting time
In the above embodiment, the waiting time is set when the speed before the stop of driving of the
Fig. 19 is a flowchart showing a processing procedure when the waiting time is set based on the speed and the exposure time before the stop of the driving of the aperture motor.
At this time, first, it is determined whether or not the
When the
When the aperture value is set, the driving condition of the
When the speed before the stop of the
On the other hand, in the case where the exposure time is greater than the 4 th threshold (in the case where the exposure time > the 4 th threshold), the waiting time is not set. In step S64, if it is determined that the speed before the stop of the
In this manner, the waiting time may be set in accordance with the speed and the exposure time before the stop of the driving of the
4 th threshold
Fig. 20 is a graph showing the transition of the fluctuation of the aperture diameter after the stop of the driving of the aperture motor. In fig. 20, the horizontal axis represents time, and the vertical axis represents the aperture diameter of the diaphragm.
As shown in fig. 20, the period T of the fluctuation of the aperture diameter of the
In this way, by setting 1/2 of the period T of fluctuation of the aperture diameter to the 4 th threshold, it can be more appropriately determined whether or not the waiting time is set.
Other embodiments diamond solid
[ position for switching the drive speed of the aperture motor ]
In the above embodiment, the position P at which the driving of the
[ Aperture ]
In the above-described embodiments, the case where the present invention is applied to a camera using a variable aperture was described as an example, but the application of the present invention is not limited to this. The present invention can be applied to a camera using a diaphragm that varies an actual aperture diameter (aperture value) according to a driving speed of an actuator. In other words, the present invention can be applied to a camera using a diaphragm that varies the aperture diameter according to the driving speed.
In the above embodiment, the actuator for driving the diaphragm is a stepping motor, but the actuator for driving the diaphragm is not limited to this. Further, by using the stepping motor, open-loop control can be performed, and the configuration and control of the apparatus can be simplified.
[ Driving speed of Aperture Motor ]
The driving speed of the
The 1 st speed and the 2 nd speed may be variable according to a setting by a user, an imaging mode, or the like. In this case, the aperture control device is provided with a drive speed setting unit for setting the 1 st speed and the 2 nd speed.
When the user sets the 1 st speed and the 2 nd speed, the 1 st speed and the 2 nd speed are set by, for example, the
When the 1 st speed and the 2 nd speed are set according to the shooting mode or the like, the 1 st speed and the 2 nd speed are set by the
[ Structure of Camera ]
In the above-described embodiments, the case where the present invention is applied to a lens interchangeable camera has been described as an example, but the application of the present invention is not limited thereto. The present invention can also be applied to a lens-integrated camera in which a lens is integrally assembled to a camera body.
In the above embodiment, the
In the above-described embodiments, the case where the present invention is applied to a digital camera has been described as an example, but the application of the present invention is not limited to this. It is also applicable to a so-called silver salt camera. Further, the present invention can be applied to a video camera, a television camera, a movie camera, and the like, and can also be similarly applied to an electronic device having an image pickup function (for example, a mobile phone, a smartphone, a tablet computer, a notebook computer, and the like).
[ Aperture control device and Exposure control device ]
In the above-described embodiments, the case where the diaphragm control device and the exposure control device according to the present invention are combined was described as an example, but the diaphragm control device and the exposure control device may be used separately.
When used alone, the exposure control device can replace the 2 nd threshold value, the 3 rd threshold value, and the 4 th threshold value with the 5 th threshold value, the 6 rd threshold value, and the 7 th threshold value, which are described in the above embodiments.
For example, when determining whether or not to set the waiting time based on the speed before the stop of the driving of the
When determining whether or not to set the waiting time based on the speed before the stop of driving the
When determining whether or not to set the waiting time based on the speed and the exposure time before the stop of the driving of the
When determining whether or not to set the waiting time based on the speed before the stop of the
[ others ]
In the above-described embodiment, the functions of the aperture control device, the exposure control device, and the like are realized by a microcomputer, but the hardware configuration for realizing these functions is not limited to this. Can be constituted by various processors. The various processors include a CPU, which is a general-purpose processor functioning as a processing unit for executing software (program) to perform various processes, a PLD (Programmable Logic Device), which is a processor capable of changing a Circuit configuration after manufacturing, such as an FPGA (Field Programmable Gate Array), and a dedicated Circuit, which is a processor having a Circuit configuration specifically designed to execute a Specific process, such as an ASIC (Application Specific Integrated Circuit). The medium storing the predetermined program (the diaphragm control program, the exposure control program, and the like) may be a non-transitory computer-readable recording medium such as a hard Disk, a CD (Compact Disk), a DVD (Digital versatile Disk), or various semiconductor memories.
One processing unit may be constituted by one of these various processors, or may be constituted by two or more processors of the same kind or different kinds. For example, the present invention may be configured by a plurality of FPGAs, or may be configured by a combination of a CPU and an FPGA.
Further, a plurality of processing units may be configured by one processor. As an example in which a plurality of processing units are configured by one processor, the following method is used in 1 st, as represented by a computer such as a client or a server: one processor is configured by a combination of one or more CPUs and software, and functions of a plurality of processing units are exerted by the processor. 2, as represented by a system on Chip (SoC) and the like, the following method is provided: a processor is used in which the functions of the entire system including a plurality of processing units are realized by one IC chip (Integrated Circuit). In this manner, the various processing units are configured as a hardware configuration using one or more of the various processors described above.
More specifically, the hardware configuration of these various processors is a circuit in which circuit elements such as semiconductor elements are combined.
Description of the symbols
1-camera, 10-interchangeable lens, 12-lens barrel, 14-lens operating section, 16-focus ring, 18-aperture ring, 20-focus adjusting mechanism, 22-focus lens group, 26-focus motor, 28-motor driving circuit, 30-light amount adjusting mechanism, 32-aperture, 32 a-aperture blade, 32B-aperture, 36-aperture motor, 38-motor driving circuit, 40-lens microcomputer, 42-focus control device, 44-aperture control device, 44A-aperture motor driving condition setting section, 44B-aperture motor driving control section, 44C-aperture control information storage section, 44D-aperture operating speed setting section, 100-camera body, 102-body side mount, 104-main display, 104a-LCD drive circuit, 106-sub display, 106a-LCD drive circuit, 108-electronic viewfinder, 108a-LCD drive circuit, 110-camera operation section, 111-sensitivity dial, 112-delete button, 113-power lever, 114-shutter button, 115-drive button, 116-sub display illumination button, 117-shutter speed dial, 118-play button, 119-front instruction dial, 120-rear instruction dial, 121-focus lever, 122-shortcut menu button, 123-menu/ok button, 124-select button, 125-display/return button, 126-function 1 button, 127-function 2 button, 128-function 3 button, 129-4 th function button, 130-5 th function button, 140-timer portion, 150-image sensor, 152-image sensor drive circuit, 154-shutter, 156-shutter drive circuit, 220-Analog signal processing portion, 222-ADC (Analog-to-digital converter), 224-digital signal processing portion, 226-phase difference AF processing portion, 228-memory card interface, 230-memory card, 250-camera microcomputer, 252-exposure control device, 252A-light measuring portion, 252B-exposure setting portion, 252C-exposure start condition setting portion, 252D-exposure control portion, 254-AF control device, 256-recording control device, 258-main display control device, 260-sub-display control device, 262-EVF display control device, L-optical axis, period of variation in aperture diameter of T-diaphragm, S1-S5-setting order of driving condition of diaphragm motor, S10-S17-setting order of driving condition of diaphragm motor, S20-S25-exposure control order, S30-S36-exposure control order, S40-S46-exposure control order, S50-S57-exposure control order, S60-S66-exposure control order.
- 上一篇:一种医用注射器针头装配设备
- 下一篇:相机模块