阅读说明：本技术 镜头装置以及摄像装置 (Lens device and imaging device ) 是由 城野方博 白龙吉 小山高志 于 2021-03-30 设计创作，主要内容包括：一种镜头装置,包括：旋转限制部,当第二筒在第一位置时,旋转限制部将第一环的旋转限制在第一旋转角度范围,当第二筒在第二位置时,旋转限制部将第一环的旋转限制在第二旋转角度范围,其中,第二筒保持多个透镜,并以在第一位置和第二位置之间可与多个透镜一同在光轴方向上移动的方式布置于第一筒内；以及电路,电路构成为基于第一环相对于第一筒的旋转角度,对驱动机构进行控制以使多个透镜中的至少一个透镜沿着光轴方向移动。旋转限制部包括设于凸轮环的第一限制部以及设于第一环的第二限制部,通过由第一限制部限制第二限制部,将第一环的旋转限制在第一旋转角度范围或第二旋转角度范围。(A lens apparatus, comprising: a rotation restricting portion that restricts rotation of the first ring to a first rotation angle range when the second barrel is in a first position and restricts rotation of the first ring to a second rotation angle range when the second barrel is in a second position, wherein the second barrel holds the plurality of lenses and is arranged in the first barrel so as to be movable in the optical axis direction together with the plurality of lenses between the first position and the second position; and an electric circuit configured to control the driving mechanism to move at least one of the plurality of lenses in the optical axis direction based on a rotation angle of the first ring with respect to the first cylinder. The rotation restricting portion includes a first restricting portion provided to the cam ring and a second restricting portion provided to the first ring, and restricts rotation of the first ring to a first rotational angle range or a second rotational angle range by restricting the second restricting portion by the first restricting portion.)

1. A lens apparatus, comprising: a first barrel containing a plurality of lenses;

a first ring rotatably disposed around the first barrel about an optical axis;

a second barrel that holds the plurality of lenses, and is arranged inside the first barrel so as to be movable in the optical axis direction together with the plurality of lenses between a first position and a second position;

a cam ring that is disposed around the first tube rotatably about an optical axis and includes a cam groove that engages with a cam pin of the second tube via a groove of the first tube in an optical axis direction;

a switching ring that is disposed around the cam ring together with the cam ring rotatably about an optical axis and that receives an operation of switching the second barrel between the first position and the second position via the cam ring by rotating about the optical axis;

a rotation restricting portion that restricts rotation of the first ring to a first rotational angle range when the second cylinder is in the first position; restricting rotation of the first ring to a second rotational angle range when the second cartridge is in the second position; and

an electric circuit configured to control a driving mechanism to move at least one of the plurality of lenses in an optical axis direction based on a rotation angle of the first ring with respect to the first barrel,

the rotation restricting portion includes a first restricting portion provided to the cam ring and a second restricting portion provided to the first ring, and restricts rotation of the first ring to the first rotational angle range or the second rotational angle range by being restricted by the first restricting portion.

2. The lens apparatus according to claim 1, wherein the first restriction portion is provided to an outer peripheral surface of the cam ring,

two second restricting portions are provided on the surface of the first ring on the image plane side,

one of the two second restricting portions is in contact with the first restricting portion at one boundary of the first rotational angle range or one boundary of the second rotational angle range to restrict rotation of the first ring,

the other of the two second limiting portions is in contact with the first limiting portion at the other boundary of the first rotational angle range or the other boundary of the second rotational angle range to limit the rotation of the first ring.

3. The lens device according to claim 1, characterized in that the first ring is a display ring that displays respective indices of rotation angles of the first ring with respect to the first barrel.

4. The lens device according to claim 3, further comprising an operation ring rotatably arranged around the first barrel about an optical axis, receiving an operation of moving at least one of the plurality of lenses in an optical axis direction,

the display ring is arranged to be movable together with the operation ring between a third position and a fourth position in the optical axis direction, and when in the third position, the display ring rotates around the optical axis together with the operation ring along with the rotation of the operation ring; when in the fourth position, the display ring does not rotate about the optical axis together with the operation ring in accordance with the rotation of the operation ring.

5. The lens device according to claim 4, wherein the circuit is configured as follows:

moving at least one of the plurality of lenses in an optical axis direction based on a rotation angle of the display ring relative to the first barrel when the operation ring and the display ring are in the third position;

when the operation ring and the display ring are at the fourth position, the driving mechanism is controlled to move at least one of the plurality of lenses in the optical axis direction based on the rotation amount and the rotation direction of the operation ring.

6. The lens device according to claim 4, further comprising: a friction member disposed between respective faces of the operation ring and the display ring that face each other, the friction member causing the display ring to generate a frictional force when the operation ring and the display ring are in the third position, the frictional force causing the display ring and the operation ring to rotate together with rotation of the operation ring; and

a resistance member that causes the display ring to generate a resistance force when the operating ring and the display ring are in the fourth position, the resistance force preventing the display ring and the operating ring from rotating together with rotation of the operating ring.

7. The lens device according to claim 6, wherein the resistance member includes: a first engaging member fixed to the display ring; and a second engaging member fixed to the cam ring, the second engaging member engaging with the first engaging member when the operation ring and the display ring are at the fourth position.

8. The lens device according to claim 7, wherein the first engaging member includes a plurality of first convex portions, and the second engaging member includes a plurality of second convex portions that engage with the plurality of first convex portions.

9. The lens device according to claim 6, wherein the display ring covers a part of an outer peripheral surface of the operation ring,

the friction member is disposed between the portion of the outer peripheral surface of the operation ring and a portion of the inner peripheral surface of the display ring opposite to the portion of the outer peripheral surface of the operation ring.

10. The lens device according to claim 4, further comprising a cover ring disposed around the first barrel, the cover ring covering an outer peripheral surface on which the index of the display ring is displayed when the operation ring and the display ring are in the fourth position.

11. An image pickup apparatus, comprising: the lens device according to any one of claims 1 to 10; and

and an image sensor for photographing the image formed by the plurality of lenses.

Technical Field

The present invention relates to a lens device and an imaging device.

Background

Patent document 1 describes "the user selects whether to set the normal autofocus operation mode or the manual focus operation mode by operating the focus mode switching operation unit 5".

[ Prior art documents ]

[ patent document ]

[ patent document 1] Japanese patent application laid-open No. 2013-7906

Disclosure of Invention

[ technical problem to be solved by the invention ]

When the shooting mode is switched by rotation of a ring such as an operation ring included in the lens apparatus, structural restrictions are generated.

[ MEANS FOR SOLVING PROBLEMS ] to solve the problems

A lens apparatus according to an aspect of the present invention may include a first barrel that accommodates a plurality of lenses. The lens device may include a first ring rotatably disposed around the first barrel about the optical axis. The lens device may include a second barrel that holds the plurality of lenses and is arranged in the first barrel so as to be movable in the optical axis direction together with the plurality of lenses between the first position and the second position. The lens apparatus may include a cam ring including a cam groove rotatably arranged around the first barrel about the optical axis, and engaged with a cam pin of the second barrel via a groove of the first barrel in the optical axis direction. The lens apparatus may include a switching ring that is disposed around the cam ring together with the cam ring rotatably about the optical axis and that receives an operation of switching the second barrel between the first position and the second position via the cam ring by rotating about the optical axis. The lens device may include a rotation restricting portion that restricts rotation of the first ring to a first rotational angle range when the second barrel is in the first position, and restricts rotation of the first ring to a second rotational angle range when the second barrel is in the second position. The lens apparatus may include a circuit configured as follows: the driving mechanism is controlled to move at least one of the plurality of lenses in the optical axis direction based on a rotation angle of the first ring with respect to the first barrel. The rotation restricting portion includes a first restricting portion provided to the cam ring and a second restricting portion provided to the first ring, and the rotation of the first ring can be restricted to the first rotational angle range or the second rotational angle range by the first restricting portion restricting the second restricting portion.

The first restriction portion may be provided on an outer peripheral surface of the cam ring. The second restriction portion may be provided in two on the surface on the image plane side of the first ring. One of the two second limiting portions may contact the first limiting portion at one boundary of the first rotational angle range or one boundary of the second rotational angle range, limiting rotation of the first ring. The other of the two second limiting portions may contact the first limiting portion at the other boundary of the first rotation angle range or the other boundary of the second rotation angle range, and limit the rotation of the first ring.

The first ring may be a display ring that displays a respective indication of the angle of rotation of the first ring relative to the first barrel.

The lens apparatus may include an operation ring rotatably arranged around the first barrel about the optical axis, and receiving an operation of moving at least one of the plurality of lenses in the optical axis direction. The display ring may be disposed to be movable together with the operation ring between a third position and a fourth position in the optical axis direction, and when in the third position, the display ring may be rotatable together with the operation ring about the optical axis in accordance with rotation of the operation ring, and when in the fourth position, the display ring may not be rotatable together with the operation ring about the optical axis in accordance with rotation of the operation ring.

The circuit may be configured as follows: moving at least one of the plurality of lenses in the optical axis direction based on a rotation angle of the display ring relative to the first barrel when the operation ring and the display ring are in the third position; when the operation ring and the display ring are at the fourth position, the driving mechanism is controlled to move at least one of the plurality of lenses in the optical axis direction based on the rotation amount and the rotation direction of the operation ring.

The lens apparatus may include a friction member disposed between respective faces of the operation ring and the display ring facing each other, the friction member causing the display ring to generate a friction force that rotates the display ring and the operation ring together with rotation of the operation ring when the operation ring and the display ring are in the third position. The lens apparatus may include a resistance member that causes the display ring to generate a resistance force that prevents the display ring and the operation ring from rotating together with the rotation of the operation ring when the operation ring and the display ring are in the fourth position.

The resistance member may include a first engaging member fixed to the display ring and a second engaging member fixed to the cam ring, the second engaging member engaging with the first engaging member when the operation ring and the display ring are in the fourth position.

The first engaging member may include a plurality of first protrusions. The second engaging member may include a plurality of second convex portions that engage with the plurality of first convex portions.

The display ring may cover a portion of the outer peripheral surface of the operation ring. The friction member may be disposed between a portion of an outer peripheral surface of the operation ring and a portion of an inner peripheral surface of the display ring opposite to the portion of the outer peripheral surface of the operation ring.

The lens device may include a cover ring disposed around the first barrel, covering an outer peripheral surface of the display ring that displays the index of the display ring when the operation ring and the display ring are in the fourth position.

The image pickup device may include a lens device and an image sensor that picks up an image imaged through a plurality of lenses.

When the shooting mode is switched by rotating a ring such as an operation ring included in the lens device, structural restrictions can be avoided.

In addition, the above summary does not list all necessary features of the present invention. Furthermore, sub-combinations of these feature sets may also constitute the invention.

Drawings

Fig. 1 is an external perspective view showing an imaging device according to the present embodiment.

Fig. 2 is a diagram showing an example of a functional block diagram of the imaging apparatus according to the present embodiment.

Fig. 3 is a diagram showing a side view of the lens portion set to the full-time manual focus mode.

Fig. 4 is a diagram showing a side view of the lens part set in the distance scale manual focus mode.

Fig. 5 is a sectional perspective view of the lens portion in which the operation ring and the display ring are moved to the image plane side position state in the optical axis direction.

Fig. 6 is a sectional perspective view of the lens portion in which the operation ring and the display ring are moved to the object side position state in the optical axis direction.

Fig. 7 is a sectional perspective view of an enlarged portion including the friction member and the resistance member when the operation ring and the display ring are at the image plane side position.

Fig. 8 is a sectional perspective view of an enlarged portion including the friction member and the resistance member when the operation ring and the display ring are at the object side position.

Fig. 9 is a diagram showing a positional relationship of the rotation restricting portion in the normal shooting mode.

Fig. 10 is a diagram showing a positional relationship of the rotation restricting portion in the normal shooting mode.

Fig. 11 is a diagram showing a positional relationship of the rotation restricting portion in the normal shooting mode.

Fig. 12 is a diagram showing a positional relationship of the rotation restricting portion in the macro imaging mode.

Fig. 13 is a diagram showing a positional relationship of the rotation restricting portion in the macro imaging mode.

Fig. 14 is a diagram showing a positional relationship of the rotation restricting portion in the macro imaging mode.

Fig. 15 is a diagram showing a positional relationship of the potentiometer in the normal shooting mode.

Fig. 16 is a diagram showing a positional relationship of the potentiometer in the normal shooting mode.

Fig. 17 is a diagram showing a positional relationship of the potentiometer in the normal shooting mode.

Fig. 18 is a diagram showing a positional relationship of the potentiometer in the normal shooting mode.

Fig. 19 is a diagram showing a positional relationship of the potentiometer in the macro imaging mode.

Fig. 20 is a diagram showing a positional relationship of the potentiometer in the macro shooting mode.

Fig. 21 is a diagram showing a positional relationship of the potentiometer in the macro shooting mode.

Fig. 22 is a diagram showing a positional relationship of the potentiometer in the macro shooting mode.

Fig. 23 is a diagram for explaining the relationship between the arc length of the resistor and the arc length of the region indicating the distance scale of the ring.

Fig. 24 is a diagram for explaining the relationship between the arc length of the resistor and the arc length of the region indicating the distance scale of the ring.

[ notation ] to show

100 image pickup device

102 image pickup part

110 image pickup control unit

120 image sensor

130 memory

160 display part

162 indicating part

200 lens part

201 operating ring

202 display ring

203 switching loop

204 cover ring

206 function ring

207 Friction member

208 first engaging member

209 second engaging member

210 resistance member

211 first lens group

212 second lens group

213 third lens group

214 fourth lens group

215 light quantity control mechanism

220 fixed cylinder

222 straight-in tube

224 cam ring

225 cam pin

230 circuit board

240 rotation restricting part

241 first limiting part

244 first rotation angle range

245 second range of rotation angle

250 potentiometer

251 resistor

252 sliding sheet

253 flexible printed circuit board

270 driving mechanism

280 lens control part

290 memory

2021 leaf spring

2201 straight groove

2241 cam groove

2421, 2422 second limiting part

Detailed Description

The present invention will be described below with reference to embodiments of the invention, but the following embodiments do not limit the invention according to the claims. Moreover, all combinations of features described in the embodiments are not necessarily essential to the inventive solution. It will be apparent to those skilled in the art that various changes and modifications can be made in the following embodiments. It is apparent from the description of the claims that the modes to which such changes or improvements are made are included in the technical scope of the present invention.

The claims, the specification, the drawings, and the abstract of the specification contain matters to be protected by copyright. The copyright owner would not make an objection to the facsimile reproduction by anyone of the files, as represented by the patent office documents or records. However, in other cases, the copyright of everything is reserved.

Fig. 1 is a diagram showing an example of an external perspective view of an imaging apparatus 100 according to the present embodiment. Fig. 2 shows an example of a functional block diagram of the imaging apparatus 100 according to the present embodiment. The imaging device 100 includes an imaging section 102 and a lens section 200. The imaging unit 102 includes an image sensor 120, an imaging control unit 110, and a memory 130. The image sensor 120 may be formed of a CCD or a CMOS. The image sensor 120 captures an image imaged through the lens. The image sensor 120 outputs image data of an optical image formed through the lens to the image pickup control section 110. The imaging control unit 110 may be configured by a microprocessor such as a CPU or MPU, a microcontroller such as an MCU, or the like. The memory 130 may be a computer-readable recording medium and may also include at least one of flash memories such as an SRAM, a DRAM, an EPROM, an EEPROM, and a USB memory. The memory 130 stores programs and the like necessary for the imaging control unit 110 to control the image sensor 120 and the like. The memory 130 may be provided inside the housing of the image pickup apparatus 100. The memory 130 may be configured to be detachable from the housing of the image pickup apparatus 100.

The imaging unit 102 may further include an instruction unit 162 and a display unit 160. The instruction unit 162 is a user interface for receiving an instruction from the user to the image pickup apparatus 100. The display unit 160 displays an image captured by the image sensor 120, various setting information of the imaging apparatus 100, and the like. The display portion 160 may be composed of a touch panel.

The lens part 200 includes a first lens group 211, a second lens group 212, a third lens group 213, and a fourth lens group 214. The lens portion 200 includes a light amount control mechanism 215, a driving mechanism 270, and a lens control portion 280. The first lens group 211, the second lens group 212, the third lens group 213, and the fourth lens group 214 may function as a single focus lens. The first lens group 211, the second lens group 212, the third lens group 213, and the fourth lens group 214 are arranged to be movable along the optical axis. The lens portion 200 may be an interchangeable lens that is provided to be attachable to and detachable from the image pickup portion 102. The driving mechanism 270 moves at least one of the second lens group 212 and the third lens group 213 in the optical axis direction. The driving mechanism 270 may move the first lens group 211 or the fourth lens group 214 in the optical axis direction. The lens control unit 280 drives the driving mechanism 270 in accordance with a lens control command from the image pickup unit 102, and moves the second lens group 212 and the third lens group 213 in the optical axis direction. For example, the lens control instruction is a focus control instruction. The driving mechanism 270 may include a motor, a cam ring driven by the motor, and a moving frame that moves in the optical axis direction along with the lens as the cam ring rotates. The motor may be a stepper motor, a DC motor, a coreless motor, or an ultrasonic motor.

The lens portion 200 also includes a memory 290. The memory 290 stores control values of the driving mechanism 270 and the lens moved by the driving mechanism 270. The memory 290 may include at least one of flash memories such as SRAM, DRAM, EPROM, EEPROM, and USB memory.

The light amount control mechanism 215 controls the amount of light incident on the image sensor 120. The light amount control mechanism 215 includes at least one of an aperture mechanism and a shutter mechanism. The light control mechanism 215 may include a plurality of aperture blades. Light control mechanism 215 may include an actuator. The actuator may be an electromagnetic actuator. The electromagnetic actuator may be an electromagnet, a solenoid, or a stepper motor. The light amount control mechanism 215 can receive a command from the lens control unit 280, drive an actuator, adjust the degree of overlapping of a plurality of aperture blades, and adjust the aperture size.

In the image pickup apparatus 100 thus configured, the lens section 200 may be a single focus lens that can switch a plurality of shooting modes. The plurality of shooting modes include: a full-time manual focusing mode in which focusing control is performed by Manual Focusing (MF) after performing focusing control by Auto Focusing (AF); and a distance scale manual focusing mode for performing focusing control by manual focusing using the distance scale. The distance scale manual focus mode includes: a mode in which a distance from an object in focus is a first distance range; and a mode in which the distance to the focused object is a second distance range including a distance shorter than that of the first distance range. More specifically, the distance scale manual focus mode includes: the distance to the subject is a normal shooting mode including a first distance range from infinity to a first distance (e.g., 0.5m), and the distance to the subject is a macro shooting mode including a second distance range from the first distance (e.g., 0.5m) to a second distance (e.g., 0.3m) shorter than the first distance.

Fig. 3 is a side view showing the lens part 200 set to the full-time manual focus mode. Fig. 4 is a side view showing the lens part 200 set to the distance scale manual focus mode.

The lens portion 200 includes: an operation ring 201, a display ring 202, a switching ring 203, and a function ring 206 rotatable around an optical axis. The lens portion 200 also includes a cover ring 204 that does not rotate about the optical axis. The operation ring 201 receives an operation of moving at least one of the second lens group 212 and the third lens group 213 in the optical axis direction to perform focus control. The display ring 202 displays distance scales representing distances from an object in focus as respective indices of rotation angles around the optical axis. The operation ring 201 and the display ring 202 are movable in the optical axis direction.

Fig. 3 shows a state when the operation ring 201 and the display ring 202 are moved to the image plane side position in the optical axis direction. Fig. 4 shows a state when the operation ring 201 and the display ring 202 are moved to the object side position in the optical axis direction. When the operation ring 201 and the display ring 202 are located at the image plane side position in the optical axis direction, the cover ring 204 covers a region indicating the distance scale of the display ring 202. When the operation ring 201 and the display ring 202 are located at the object side position along the optical axis direction, the region indicating the distance scale of the display ring 202 is exposed without being covered with the cover ring 204.

When the operation ring 201 and the display ring 202 are located at the image plane side position in the optical axis direction, the lens unit 200 is set to the full-time manual focus mode. When the operation ring 201 and the display ring 202 are located at the object side position in the optical axis direction, the lens section 200 is set to the distance scale manual focus mode.

The function ring 206 accepts an operation of switching the settings of various shooting conditions of the image pickup apparatus 100. For example, the function loop 206 accepts an operation of switching an F value or a shutter speed. The shooting conditions to be switched may be selected by the user in advance.

Fig. 5 is a sectional perspective view of the lens portion 200 in which the operation ring 201 and the display ring 202 are moved to an image-surface-side position state in the optical axis direction. Fig. 6 is a sectional perspective view of the lens portion 200 in which the operation ring 201 and the display ring 202 are moved to the object side position state in the optical axis direction.

The lens part 200 includes a fixed barrel 220 accommodating a first lens group 211, a second lens group 212, a third lens group 213, and a fourth lens group 214. The fixed barrel 220 is an example of a first barrel. The operation ring 201 is rotatably disposed around the fixed barrel 220 about the optical axis. The operation ring 201 accepts an operation from a user focus adjustment. The operation ring 201 receives an operation of moving at least one of the second lens group 212 and the third lens group 213 in the optical axis direction. The display ring 202 is rotatably arranged around the fixed cylinder 220 about the optical axis, and is arranged to be movable in the optical axis direction together with the operation ring 201 between an object side position and an image plane side position. The lens part 200 further includes a circuit substrate 230 surrounding the outer circumference of the fourth lens group 214.

The lens portion 200 also includes a friction member 207. The friction member 207 is disposed between respective faces of the operation ring 201 and the display ring 202 which face each other, and when the operation ring 201 and the display ring 202 are at the object side position, the friction member causes the display ring 202 to generate a frictional force which rotates the display ring 202 and the operation ring 201 together with the rotation of the operation ring 201.

The lens portion 200 also includes a resistance member 210. When the operation ring 201 and the display ring 202 are at the image plane side position, the resistance member 210 causes the display ring 202 to generate resistance that prevents the display ring 202 and the operation ring 201 from rotating together with the rotation of the operation ring 201.

The lens portion 200 also includes a linear barrel 222 and a cam ring 224. The linear barrel 222 holds the first lens group 211, the second lens group 212, the third lens group 213, and the fourth lens group 214. The straight-moving barrel 222 is disposed within the fixed barrel 220 in such a manner as to be movable in the optical axis direction together with the first lens group 211, the second lens group 212, the third lens group 213, and the fourth lens group 214 between a normal shooting position in which a photographable distance range is set to a first distance range (for example, a range from infinity to 0.5m) and a macro shooting position in which a photographable distance range is set to a second distance range (for example, a range from 0.5m to 0.3 m).

The cam ring 224 is disposed around the fixed barrel 220 rotatably about the optical axis, and includes a cam groove 2241 (shown in fig. 6) that engages with a cam pin 225 of the straight-moving barrel 222 via a straight-moving groove 2201 of the fixed barrel 220 in the optical axis direction.

The switching ring 203 and the cam ring 224 are arranged together rotatably around the optical axis around the cam ring 224. The switching ring 203 receives an operation of switching the rectilinear motion tube 222 between the normal shooting position and the macro shooting position via the cam ring 224.

By rotating the switching ring 203 around the optical axis, the cam ring 224 is rotated around the optical axis. By rotating the cam ring 224, the cam pin 225 is guided by the straight-moving groove 2201 and the cam groove 2241, and the straight-moving cylinder 222 moves between the normal shooting position and the macro shooting position in the optical axis direction.

Fig. 7 is a sectional perspective view of an enlarged portion including the friction member 207 and the resistance member 210 when the operation ring 201 and the display ring 202 are at the image plane side position. Fig. 8 is a sectional perspective view of an enlarged portion including the friction member 207 and the resistance member 210 when the operation ring 201 and the display ring 202 are in the object side position.

The display ring 202 covers a part of the outer peripheral surface of the operation ring 201. The friction member 207 is disposed between a portion of the outer peripheral surface of the operation ring 201 and a portion of the inner peripheral surface of the display ring 202 opposite to the portion of the outer peripheral surface of the operation ring 201. The display ring 202 can be pressed on the operation ring 201 side in the optical axis direction by the plate spring 2021.

The friction member 207 may be bonded to a portion of the outer circumferential surface of the operation ring 201 by an adhesive. The friction member 207 may be suede-like artificial leather. The friction member 207 may be, for example, Ultrasuede (registered trademark) or Ecsaine (registered trademark).

The resistance member 210 includes a first engaging member 208 fixed to the display ring 202 and a second engaging member 209 held by the fixed cylinder 220, and when the operation ring 201 and the display ring 202 are at the image surface side position, the second engaging member 209 engages with the first engaging member 208. The first engaging member 208 includes a plurality of first protrusions. The plurality of first convex portions are arranged at equal intervals on the image surface side surface of the display ring 202.

The second engaging member 209 is held by the fixed cylinder 220 by being fixed to the cam ring 224, and engages with the first engaging member 208 when the operation ring 201 and the display ring 202 are at the image plane side position. The second engaging member 209 includes a plurality of second convex portions that engage with the plurality of first convex portions when the operation ring 201 and the display ring 202 are at the image plane side position. A plurality of second protrusions are arranged at equal intervals on the outer peripheral surface of the cam ring 224.

When the operation ring 201 and the display ring 202 are at the object side position, the lens control unit 280 controls the driving mechanism 270 to move at least one of the second lens group 212 and the third lens group 213 in the optical axis direction based on the rotation angle of the display ring 202 with respect to the fixed cylinder 220, and performs focus control. The lens control unit 280 is configured to: when the operation ring 201 and the display ring 202 are at the image surface side position, the driving mechanism 270 is controlled to move at least one of the second lens group 212 and the third lens group 213 in the optical axis direction based on the rotation amount and the rotation direction of the operation ring 201.

According to the lens unit 200 configured as such, when the distance scale manual focus mode is performed, that is, when the operation ring 201 and the display ring 202 are at the object side position, the display ring 202 rotates with the rotation of the operation ring 201 due to the frictional force of the friction member 207. On the other hand, in the full-time manual focus mode, that is, when the operation ring 201 and the display ring 202 are at the image plane side position, the first engaging member 208 fixed to the display ring 202 and the second engaging member 209 fixed to the cam ring 224 are engaged with each other. Thus, the operation ring 201 can be operated with an operation torque exceeding the frictional force of the friction member 207, and the operation ring 201 does not rotate with the rotation of the display ring 202. Therefore, even if switching is made from the distance scale manual focus mode to the full-time manual focus mode, the display ring 202 can maintain the shooting distance set in the distance scale manual focus mode.

Further, in the distance scale manual focus mode, the rotational angle range in which the display ring 202 is rotatable is physically limited to the rotational angle range corresponding to the distance scale. That is, the display ring 202 cannot rotate beyond a predetermined rotation angle range. Here, in the distance scale manual focus mode, the user may want to rotate the manipulation ring 201 beyond a predetermined rotation angle range of the display ring 202. However, the display ring 202 rotates only together with the operation ring 201 by the frictional force of the frictional member 207. Therefore, when the operation ring 201 is rotated beyond the predetermined rotational angle range of the display ring 202, if an operation torque exceeding the frictional force of the friction member 207 is generated at the operation ring 201, only the operation ring 201 is rotated. Thereby, when the operation ring 201 is to be rotated beyond the predetermined rotational angle range of the display ring 202, the load generated by the first engaging member 208 of the display ring 202 and the second engaging member 209 of the cam ring 224 can be reduced. Therefore, the first engaging member 208 and the second engaging member 209 do not need to have high rigidity, and the first convex portion and the second convex portion can be arranged at a fine pitch. Accordingly, when the distance scale manual focus mode is switched to the full-time manual focus mode, the first engaging member 208 and the second engaging member 209 are engaged with each other, whereby the rotational displacement of the display ring 202 can be minimized.

Further, the structure in which the rotational angle range in which the display ring 202 can be rotated is physically limited to the rotational angle range corresponding to the distance scale in the distance scale manual focus mode will be described.

Fig. 9, 10, and 11 show the positional relationship of the rotation restricting unit 240 in the normal shooting mode. Fig. 12, 13, and 14 show the positional relationship of the rotation restricting unit 240 in the macro imaging mode. When the linear cylinder 222 is in the normal shooting position, the rotation restricting section 240 restricts the rotation of the display ring 202 to the first rotation angle range 244. When the linear cylinder 222 is at the macro photographing position, the rotation restricting part 240 restricts the rotation of the display ring 202 to the second rotation angle range 245.

The rotation restricting section 240 includes a first restricting section 241 provided to the cam ring 224 and second restricting sections 2421, 2422 provided to the display ring 202. By restricting the second restrictions 2421, 2422 by the first restriction part 241, the rotation of the display ring 202 is restricted to the first rotational angle range 244 or the second rotational angle range 245.

The first restriction portion 241 is provided on the outer peripheral surface of the cam ring 224. The first restriction portion 241 may be a pin protruding from an outer circumferential surface of the cam ring 224. The second limiting parts 2421, 2422 may be convex or concave parts provided on the surface of the display ring 202 on the image plane side. The second limiting part 2421 contacts the first limiting part 241 at one boundary of the first rotation angle range 244 or one boundary of the second rotation angle range 245 to limit the rotation of the display ring 202. The second limiting part 2422 contacts the first limiting part 241 at the other boundary of the first rotation angle range 244 or the other boundary of the second rotation angle range 245 to limit the rotation of the display ring 202.

The first restriction portion 241 is fixed to the cam ring 224. The cam ring 224 rotates in accordance with the switching of the switching ring 203 in the normal shooting mode and the macro shooting mode, and rotates together with the switching ring 203. Therefore, in the normal shooting mode and the macro shooting mode, the position of the first restriction part 241 with respect to the fixed barrel 220 is changed. Therefore, in the normal shooting mode and the macro shooting mode, the change in the position of the rotation angle range in which the rotation of the display ring 202 is restricted.

The rotation restricting portion 240 is provided to the cam ring 224 and the display ring 202. Thus, even in the full-time manual focus mode, when the switching ring 203 is rotated, the cam ring 224 is rotated, and the normal shooting mode and the macro shooting mode are switched. That is, the linear cylinder 222 is switched between the normal shooting position and the macro shooting position. Also, according to the rotation of the cam ring 224, the position of the first restriction portion 241 is changed, and the rotational angle range of the display ring 202 is switched between the first rotational angle range 244 and the second rotational angle range 245.

The lens part 200 includes a photo interrupter for detecting a rotation amount and a rotation direction of the operation ring 201. The lens part 200 further includes a potentiometer for detecting a rotation angle of the display ring 202. In the full-time manual focus mode, the lens control unit 280 controls the driving mechanism 270 to move at least one of the second lens group 212 and the third lens group 213 in the optical axis direction based on the rotation amount and the rotation direction of the operation ring 201 detected by the photointerrupter, thereby performing focus control. In the distance scale manual focus mode, the lens control unit 280 controls the driving mechanism 270 to move at least one of the second lens group 212 and the third lens group 213 in the optical axis direction based on the rotation angle of the display ring 202 with respect to the fixed cylinder 220, thereby performing focus control.

Fig. 15, 16, 17, and 18 show positional relationships of the potentiometer 250 in the normal shooting mode. Fig. 19, 20, 21, and 22 show positional relationships of the potentiometer 250 in the macro imaging mode.

Potentiometer 250 includes a resistor 251 and a wiper 252. The resistor 251 is provided on the outer peripheral surface of the cam ring 224 and has an arc shape. The slider 252 is provided on the display ring 202, and slides on the resistor 251 while contacting the resistor 251. The potentiometer 250 detects the rotation angle of the display ring 202 relative to the cam ring 224 based on the potential of the slider 252.

The potentiometer 250 also includes a flexible printed circuit board 253. One end of the flexible printed circuit board 253 is electrically connected to one end of the resistor 251. The other end of the flexible printed circuit board 253 is electrically connected to the circuit substrate 230. The resistor 251 is electrically connected to the circuit substrate 230 through the flexible printed circuit board 253, and thus can rotate around the optical axis together with the cam ring 224 in a state of being electrically connected to the circuit substrate 230.

According to the rotation of the cam ring 224, the resistor 251 moves relative to the fixed tube 220. In the normal photographing mode, the potentiometer 250 may detect a rotation angle of the display ring 202 with respect to the cam ring 224 in the first rotation angle range 244 in which the display ring 202 rotates. On the other hand, in the macro photography mode, the potentiometer 250 may detect the rotation angle of the display ring 202 with respect to the cam ring 224 in the second rotation angle range 245 in which the display ring 202 rotates. Therefore, the arc length of the resistor 251 may be shorter than that of the region where the distance scale as an index of the display ring 202 is displayed.

As shown in FIG. 23, it is contemplated that the arc length of resistor 251 may be longer than the arc length of the region of the distance scale displaying ring 202, or longer than the arc length of the region of the distance scale displaying ring 202. However, if the arc length of the resistor 251 is long, the detection accuracy may be degraded due to the relationship between the voltage that can be applied to the resistor 251 and the noise. On the other hand, as shown in fig. 24, according to the present embodiment, the resistor 251 moves with respect to the area of the distance scale of the display ring 202 in the normal shooting mode and the macro shooting mode. Therefore, the arc length of the resistor 251 may be shorter than that of the region where the distance scale as an index of the display ring 202 is displayed. The arc length of the resistor 251 becomes short, and thus a decrease in detection accuracy can be prevented.

In the normal photographing mode, the size of the first rotation angle range 244 in which the display ring 202 can be rotated is the same as the size of the second rotation angle range 245 in which the display ring 202 can be rotated in the macro photographing mode. Therefore, the arc length of the resistor 251 may be half the length of the arc length of the region displaying the distance scale as an index of the display ring 202.

Since the resistor 251 moves relative to the fixed cylinder 220, the lens control unit 280 cannot specify the rotation angle of the display ring 202 relative to the fixed cylinder 220 from only the detection result of the potentiometer 250. Therefore, the lens control unit 280 controls the driving mechanism 270 to move at least one of the second lens group 212 and the third lens group 213 in the optical axis direction based on the rotational position of the switching ring 203 with respect to the fixed cylinder 220 and the rotational angle of the display ring 202 detected by the potentiometer 250, thereby performing focus control.

The lens part 200 includes a photo interrupter that detects rotation of the switching ring 203. The lens control unit 280 determines whether the switching ring 203 is at the rotational position corresponding to the normal shooting mode or the rotational position corresponding to the macro shooting mode based on the detection result of the photo interrupter. The lens control unit 280 may determine the rotation angle of the display ring 202 with respect to the fixed cylinder 220 based on the determination result of whether the switch ring 203 is at the rotation position corresponding to the normal shooting mode or the rotation position corresponding to the macro shooting mode and the rotation angle of the display ring 202 detected by the potentiometer 250. Lens control unit 280 may control drive mechanism 270 to move at least one of second lens group 212 and third lens group 213 in the optical axis direction based on the determined rotation angle of display ring 202 with respect to fixed cylinder 220, thereby performing focus control.

The present invention has been described above using the embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various changes and modifications can be made in the above embodiments. It is apparent from the description of the claims that the modes to which such changes or improvements are made are included in the technical scope of the present invention.

It should be noted that the execution order of the operations, procedures, steps, and stages of the devices, systems, programs, and methods shown in the claims, the description, and the drawings of the specification may be implemented in any order as long as it is not particularly explicitly indicated as "before. The operational flow in the claims, the specification, and the drawings of the specification is described using "first", "next", and the like for convenience, but it is not necessarily meant to be performed in this order.