阅读说明：本技术 镜头设备和摄像设备 (Lens apparatus and image pickup apparatus ) 是由 上原匠 于 2020-03-13 设计创作，主要内容包括：[问题]提供能够以宽的范围改变基线长度的镜头设备。[方案]镜头设备(120)包括第一光学系统(200R)和与第一光学系统并列布置的第二光学系统(200L)。第一光学系统和第二光学系统从被摄体侧朝向图像侧均依次具有第一光轴(OA1)、第二光轴(OA2)和第三光轴(OA3)。第一光学系统和第二光学系统均绕着平行于第三光轴的轴线旋转,由此第一光学系统和第二光学系统的相应第一光轴之间的距离(L1)比其相应第三光轴之间的距离(L3)改变得大。([ problem ] to provide a lens apparatus capable of changing the base length in a wide range. [ solution ] A lens device (120) includes a first optical system (200R) and a second optical system (200L) arranged in parallel with the first optical system. The first optical system and the second optical system each have a first optical axis (OA1), a second optical axis (OA2), and a third optical axis (OA3) in this order from the object side toward the image side. The first optical system and the second optical system are each rotated about an axis parallel to the third optical axis, whereby a distance (L1) between the respective first optical axes of the first optical system and the second optical system is changed to be larger than a distance (L3) between the respective third optical axes thereof.)

1. A lens apparatus, comprising:

a first optical system; and

a second optical system arranged in parallel with the first optical system,

wherein the first optical system and the second optical system each include a first optical axis, a second optical axis, and a third optical axis in this order from an object side toward an image side, and

when the first optical system and the second optical system are both rotated about an axis parallel to the third optical axis, a distance between the first optical axis of the first optical system and the first optical axis of the second optical system changes to be larger than a distance between the third optical axes.

2. The lens apparatus according to claim 1, wherein the first optical system and the second optical system are each an optical system that deflects an incident light beam twice.

3. The lens apparatus according to claim 1 or 2, wherein the second optical axis is orthogonal to the first optical axis.

4. The lens apparatus according to any one of claims 1 to 3, wherein the third optical axis is parallel to the first optical axis.

5. The lens apparatus according to any one of claims 1 to 4, wherein a distance between the first optical axes changes when the first optical system and the second optical system are both rotated about the third optical axis.

6. The lens apparatus according to any one of claims 1 to 5, wherein a first rotation amount of the first optical system and a second rotation amount of the second optical system are the same angle in opposite directions.

7. The lens apparatus according to any one of claims 1 to 6, wherein the lens apparatus further comprises:

a first rotation mechanism of the first optical system;

a second rotation mechanism of the second optical system; and

a gear configured to connect the first and second rotation mechanisms to each other.

8. The lens apparatus according to any one of claims 1 to 7, wherein the lens apparatus is a stereoscopic imaging lens apparatus configured to form two images having parallax using the first optical system and the second optical system.

9. An image pickup apparatus, comprising:

the lens apparatus according to any one of claims 1 to 8; and

a camera body configured to hold an image sensor.

10. The apparatus according to claim 9, wherein the image sensor is a single image sensor configured to form a first image formed by the first optical system and a second image formed by the second optical system in parallel.

11. The image pickup apparatus according to claim 9 or 10, wherein the lens apparatus is detachable from the camera body.

12. The image capturing apparatus according to any one of claims 9 to 11, wherein the image capturing apparatus further includes:

a detection device configured to detect a position of the third optical axis; and

a control device configured to move a recording pixel range of the image sensor based on a position of the third optical axis.

Technical Field

The present invention relates to a lens apparatus for stereoscopic imaging.

Background

Conventionally, there is known a lens apparatus including two sets of optical systems arranged in parallel and configured to form two images on a single image sensor. In the lens apparatus, images having parallax are projected to the right and left eyes based on the base line length, so that the observer can acquire a stereoscopic effect. The longer the base length, the stronger the stereoscopic effect experienced by the observer. In order to change the base length, the distance between the right optical system and the left optical system must be changed. When the images of the two optical systems are formed side by side on a single image sensor, the images cannot be separated beyond the light receiving range of the optical sensor, and the two images cannot be brought close to each other in a manner of overlapping each other.

Patent document 1 discloses a stereoscopic imaging optical system capable of changing a base line length by decentering and narrowing apertures (diaphragm) in right-eye and left-eye optical systems with respect to respective optical axes without moving positions of two images arranged on an image sensor.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2012-113281

Disclosure of Invention

Problems to be solved by the invention

The stereoscopic imaging optical system disclosed in patent document 1 cannot change the base line length when the aperture is opened. In addition, in the stereoscopic imaging optical system, the variation range of the base line length is limited to the range of the opening diameter of the aperture.

An object of the present invention is to provide a lens apparatus and an image pickup apparatus each capable of changing a base line length in a wide range.

Means for solving the problems

A lens apparatus according to an aspect of the present invention includes: a first optical system; and a second optical system arranged in parallel with the first optical system. The first optical system and the second optical system each include a first optical axis, a second optical axis, and a third optical axis in this order from the object side toward the image side. When the first optical system and the second optical system are both rotated about an axis parallel to the third optical axis, a distance between the first optical axis of the first optical system and the first optical axis of the second optical system changes to be larger than a distance between the third optical axes.

An image pickup apparatus according to another aspect of the present invention includes a lens apparatus and a camera body configured to hold an image sensor.

Other objects and features of the present invention will be described in the following embodiments.

ADVANTAGEOUS EFFECTS OF INVENTION

The present invention can provide a lens apparatus and an image pickup apparatus each capable of changing a base line length in a wide range.

Drawings

Fig. 1 is a schematic diagram of an image pickup apparatus according to the present embodiment.

Fig. 2 is a perspective view of the lens apparatus according to the present embodiment.

Fig. 3 is a sectional view of the lens apparatus according to the present embodiment.

Fig. 4 is an explanatory diagram of the lens apparatus in a state where the base line length is long in the present embodiment.

Fig. 5 is an explanatory diagram of the lens apparatus in a state where the base line length is short in the present embodiment.

Detailed Description

Referring now to the drawings, a detailed description will be given of embodiments according to the present invention.

Referring now to fig. 1, a description will be given of an image pickup apparatus according to the present embodiment. Fig. 1 is a schematic diagram of an image pickup apparatus 100. The image pickup apparatus 100 is capable of taking a stereoscopic image. The image capturing apparatus 100 includes a camera body 110 and a lens apparatus 120. The lens apparatus 120 is an interchangeable lens that can be attached to and detached from the camera body 110. However, the present invention is not limited to the present embodiment, and is applicable to an image pickup apparatus in which the camera body 110 and the lens apparatus 120 are integrated with each other.

The lens apparatus 120 includes a right-eye optical system (first optical system) 200R, a left-eye optical system (second optical system) 200L, and a system control unit (lens system control unit) 121. The camera body 110 includes an image sensor 111, an a/D converter 112, an image processing unit 113, a display unit 114, an operation unit 115, a memory 116, a system control unit (camera system control unit) 117, and a detection unit (detection device) 118. The detection unit 118 may be provided in the lens device 120. When the lens apparatus 120 is attached to the camera body 110, the system control unit 117 of the camera body 110 and the system control unit 121 of the lens apparatus 120 are electrically connected to each other.

The object image includes a right-eye image (first image) formed by the right-eye optical system 200R and a left-eye image (second image) formed by the left-eye optical system 200L, and is arranged on the image sensor 111. The image sensor 111 converts an imaged subject image (optical signal) into an analog electric signal. The a/D converter 112 converts an analog electric signal output from the image sensor 111 into a digital electric signal (image signal). The image processing unit 113 performs various image processes on the digital electric signal (image signal) output from the a/D converter 112.

The display unit 114 displays various types of information. The display unit 114 is realized by using an electronic viewfinder or a liquid crystal panel, for example. The operation unit 115 serves as a user interface for giving instructions to the image capturing apparatus 100 by a user. When the display unit 114 has a touch panel, the touch panel also constitutes one of the operation units 115. The memory 116 stores various data such as image data processed by the image processing unit 113. The memory 116 stores programs. The memory 116 is realized by using, for example, a ROM, a RAM, and an HDD. The system control unit 117 controls the entire image capturing apparatus 100 in an integrated manner. The system control unit 117 is realized by using a CPU, for example.

Referring now to fig. 2 and 3, a description will be given of the configuration of the lens apparatus 120. Fig. 2 is a perspective view of the lens apparatus 120. Fig. 3 is a sectional view of right-eye optical system 200R and left-eye optical system 200L. In the following description, R is added to the end of the reference numeral in the description of the right-eye optical system, and L is added to the end of the reference numeral in the description of the left-eye optical system. In the description common to both the right-eye optical system and the left-eye optical system, R and L are not added to the end of the reference numeral.

The lens apparatus 120 has a right-eye optical system 200R and a left-eye optical system 200L. The right-eye optical system 200R and the left-eye optical system 200L include, in order from the object side toward the image side: first optical axes OA1R and OA 1L; second optical axes OA2R and OA2L, which are substantially orthogonal to the first optical axis; and third optical axes OA3R and OA3L, which are parallel to the first optical axis. The right-eye optical system 200R and the left-eye optical system 200L include first lenses 210R and 210L, second lenses 220R and 220L, and third lenses 230R and 230L, respectively, along respective optical axes. The right-eye optical system 200R and the left-eye optical system 200L have first prisms 211R and 211L and second prisms 221R and 221L, respectively. The first prisms 211R and 211L deflect the light beams along the first optical axes OA1R and OA1L and guide them to the second optical axes OA2R and OA2L, respectively. The second prisms 221R and 221L deflect the light beams along the second optical axes OA2R and OA2L and guide them toward the third optical axes OA3R and OA 3L.

On the image sensor 111 in the camera body 110, a right-eye imaging circle ICR imaged by the right-eye optical system 200R and a left-eye imaging circle ICL imaged by the left-eye optical system 200L are formed in parallel (in parallel). Preferably, the imaging circles ICR and ICL are sized and the spacing distance between the imaging circles ICR and ICL is set so that the imaging circles ICR and ICL do not overlap each other. For example, consider a region in which the light receiving range of the image sensor 111 is divided into left and right halves with respect to the center. Preferably, the center of the right-eye imaging circle ICR is set to the approximate center of the right-side area of the light reception range, and the center of the left-eye imaging circle ICL is set to the approximate center of the left-side area of the light reception range.

A distance between the first optical axis OA1R of the right-eye optical system 200R and the first optical axis OA1L of the left-eye optical system 200L is referred to as a base length L1. The longer the base length L1, the greater the stereoscopic effect during observation. However, if the base line length L1 exceeds approximately 1/20 of the object distance, the stereoscopic effect may become excessively strong. Therefore, when the object distance is short, the base length L1 is preferably shortened.

A detailed description will be given of a method of changing the base length L1. The right-eye optical system 200R and the left-eye optical system 200L have first lens holding members 212R and 212L, second lens holding members 222R and 222L, and third lens holding members 231R and 231L, respectively. The first lens holding members 212R and 212L hold the first lenses 210R and 210L and the first prisms 211R and 211L, respectively. The second lens holding members 222R and 222L hold the second lenses 220R and 220L and the second prisms 221R and 221L, respectively. The second lens holding members 222R and 222L constitute a first rotation mechanism for the right-eye optical system 200R and a second rotation mechanism for the left-eye optical system 200L, respectively. The third lens holding members 231R and 231L hold the third lenses 230R and 230L, respectively. The right-eye optical system 200R and the left-eye optical system 200L are fixed to the lens base 123, respectively. The lens base 123 is fixed to the lens mount unit 122 for connecting the lens apparatus 120 to the camera body 110.

The right-eye optical system 200R and the left-eye optical system 200L are configured to be rotatable about third optical axes OA3R and OA3L, respectively. In the present embodiment, the outer peripheral portions 231aR and 231aL of the third lens holding members 231R and 231L are fitted to the circumferential surfaces 123aR and 123aL of the lens base 123 centered on the third optical axes OA3R and OA 3L. When the right-eye optical system 200R and the left-eye optical system 200L are rotated about the third optical axes OA3R and OA3L, the imaging circles ICR and ICL on the image sensor 111 do not move, and the positions of the first optical axes OA1R and OA1L move. Therefore, when the right-eye optical system 200R and the left-eye optical system 200L are rotated by the same angle in opposite directions, the base line length L1 can be changed while the first optical axes OA1R and OA1L of the right-eye optical system 200R and the left-eye optical system 200L are maintained in a side-by-side relationship.

As shown in fig. 2, the second lens holding members 222R and 222L of the right-eye optical system 200R and the left-eye optical system 200L are connected to each other at gears 222aR and 222aL provided to the second lens holding members 222R and 222L, respectively. Thus, the right-eye optical system 200R and the left-eye optical system 200L can be reliably rotated by the same angle in opposite directions.

Fig. 4 is an explanatory diagram of the lens apparatus 120 in a state where the base length L1 is long. Fig. 4 (a) is a front view of the lens apparatus 120 as viewed from the object side, and fig. 4 (B) shows the positions of the first optical axes OA1R and OA1L, the second optical axes OA2R and OA2L, the third optical axes OA3R and OA3L, and the imaging circles ICR and ICL. Fig. 5 is an explanatory diagram of the lens apparatus 120 in a state where the base length L1 is short. Fig. 5 (a) is a front view of the lens apparatus 120 as viewed from the object side, and fig. 5 (B) shows the positions of the first optical axes OA1R and OA1L, the second optical axes OA2R and OA2L, the third optical axes OA3R and OA3L, and the imaging circles ICR and ICL. Fig. 5 shows that the right-eye optical system 200R and the left-eye optical system 200L are rotated about the third optical axes OA3R and OA3L, respectively, and that the base line length L1 between the first optical axes OA1R and OA1L is shorter than the base line length L1 of fig. 4.

When fig. 4 and 5 are compared with each other, the second optical axes OA2R and OA2L extend in the horizontal direction in fig. 4, and the second optical axes OA2R and OA2L are arranged obliquely in fig. 5. Fig. 5 shows a shorter baseline length L1 than fig. 4. Since the third optical axes OA3R and OA3L are rotational centers, the third optical axes OA3R and OA3L do not move or the imaging circles ICR and ICL do not move. Since the imaging circles ICR and ICL do not move, even if the baseline length L1 changes, the imaging circles ICR and ICL do not lie outside the light receiving range of the image sensor 111, or the imaging circles ICR and ICL for the right and left eyes do not overlap each other. For example, assume that the dimensions of the image sensor 111 are 24mm long by 36mm wide, and the diameters of the imaging circles ICR and ICL areThe separation distance between the third optical axes OA3R and OA3L is 18mm, and the lengths of the second optical axes OA2R and OA2L are 21 mm. When the right-eye optical system 200R and the left-eye optical system 200L are configured such that the second optical axes OA2R and OA2L extend in the horizontal direction, the base line length L1 shown in fig. 4 is 60mm, which is substantially equal to the eye width of an adult. When both the right-eye optical system 200R and the left-eye optical system 200L are rotated by 60 degrees about the third optical axes OA3R and OA3L from this stateAs shown in fig. 5, the base length L1 is reduced to about 39 mm.

In the present embodiment, the right-eye optical system 200R and the left-eye optical system 200L are rotated about the third optical axes OA3R and OA3L, respectively (where the centers of rotation coincide with the third optical axes OA3R and OA 3L), but the present invention is not limited to the present embodiment. The right-eye optical system 200R and the left-eye optical system 200L are rotated about axes parallel to the third optical axes OA3R and OA3L, respectively, so that the base line length L1 (distance between the first optical axes) changes more than the distance L3 between the third optical axes. That is, as long as the rotation center is located near the third optical axes OA3R and OA3L, the distance between the first optical axes OA1R and OA1L (the baseline L1) becomes larger than the distance between the third optical axes OA3R and OA3L when the ratio of the rotation radii is considered. If the separation distance between the imaging circles ICR and ICL and the recording pixel range of each of the right and left eyes with respect to the light receiving range of the image sensor 111 have margins, the right-eye optical system 200R and the left-eye optical system 200L are respectively rotated to change the base line length L1.

When the rotation center is set at a position away from the third optical axes OA3R and OA3L and the right-eye optical system 200R and the left-eye optical system 200L are rotated, the positions of the imaging circles ICR and ICL move on the image sensor 111. In this case, it is preferable to shift the recording pixel range in accordance with the shift amounts of the imaging circles ICR and ICL. Alternatively, the amounts of movement of the imaging circles ICR and ICL may be recorded as data, and the positions of the imaging circles may be added as metadata to a data file for storing still image data and moving image data.

The positions of the third optical axes OA3R and OA3L may be calculated by the designed positions and the rotation amounts of the respective rotation axes of the right-eye optical system 200R and the left-eye optical system 200L. For example, a potentiometer may be used as the rotation amount detection unit (detection means) 118. The system control unit (control means) 117 can move the recording pixel range of the image sensor 111 based on the positions of the third optical axes OA3R and OA 3L. The positions of the third optical axes OA3R and OA3L may be replaced with the light intensity centers of the imaging circles ICR and ICL. The light intensity centers of the imaging circles ICR and ICL can be obtained from the luminance distribution of the image sensor 111.

Thus, in the present embodiment, the lens apparatus 120 has a first optical system (right-eye optical system 200R) and a second optical system (left-eye optical system 200L) arranged in parallel with the first optical system. The first optical system and the second optical system have first optical axes OA1R and OA1L, second optical axes OA2R and OA2L, and third optical axes OA3R and OA3L, respectively, in this order from the object side toward the image side. When the first optical system and the second optical system are rotated about an axis parallel to the third optical axis, a distance between the first optical axes of the first optical system and the second optical system (a base length L1) changes larger than a distance L3 between the third optical axes.

Preferably, the first optical system and the second optical system are optical systems that deflect the incident light beam twice. Preferably, the second optical axis is orthogonal to the first optical axis. Preferably, the third optical axis is parallel to the first optical axis. Preferably, the first optical system and the second optical system are rotated about the third optical axis to change a distance between the first optical axes. Preferably, the first rotation amount of the first optical system and the second rotation amount of the second optical system are the same angle in opposite directions.

Preferably, the lens apparatus includes a first rotation mechanism (second lens holding member 222R) for the first optical system, a second rotation mechanism (second lens holding member 222L) for the second optical system, and gears (222aR and 222aL) that connect the first rotation mechanism and the second rotation mechanism to each other. Preferably, the lens apparatus is a stereoscopic imaging lens apparatus capable of taking two images having parallax using the first optical system and the second optical system.

Preferably, the image sensor 111 is a single image sensor that images the first image formed by the first optical system and the second image formed by the second optical system side by side. Preferably, the image capturing apparatus 100 includes detection means (the detection unit 118) for detecting the position of the third optical axis and control means (the system control unit 117) for moving the recording pixel range of the image sensor based on the position of the third optical axis.

The present embodiment can provide a lens apparatus and an image pickup apparatus each capable of changing the base line length in a wide range.

Although the preferred embodiments of the present invention have been described, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the gist thereof.