JP2013020051A - Parallax image acquisition device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a parallax image acquisition device including a monocular optical system that acquires high-quality parallax images with a simple configuration without involving an increase in cost.SOLUTION: A parallax image acquisition device comprises: a lens housing; an imaging optical system that has a plurality of lenses installed in the lens housing, and forms a subject image on an image pickup device; and an optical axis variable member that has an optical surface arranged on the front side of the imaging optical system, and adjusts the optical surface in such a way that the imaging optical system has either one of a first optical axis for providing a first subject image and a second optical axis for providing a second subject image. The first subject image and the second subject image provide a parallax image of the subject.

Description

  The present invention relates to a parallax image acquisition device.

  3D images (stereoscopic images) are more realistic than 2D images (two-dimensional images), and have a greater effect of increasing surprise and excitement. Therefore, there is a strong need to view images as three-dimensional images in various markets. is there. On the other hand, in order to reduce the size of the photographing apparatus and avoid an increase in cost, proposals have been made to acquire a three-dimensional image with a monocular lens.

  For example, Patent Document 1 proposes a method for acquiring a parallax image by shifting a lens in an optical system. In the stereo image generation method described in Patent Document 1, at least one lens among a plurality of lenses arranged on the optical axis is shifted in a plane perpendicular to the optical axis to capture a parallax image.

  Patent Document 2 proposes a method of acquiring a parallax image by driving the entire lens frame. The stereoscopic image forming apparatus described in Patent Document 2 includes a moving unit that changes a relative position between a subject and an imaging unit that captures the subject. The subject is photographed in a first direction and a second direction, and the subject is taken from these two directions. The captured image is created on the same medium.

JP 2010-41381 A Japanese Patent Laid-Open No. 9-171221

However, in the stereo image generation method disclosed in Patent Document 1, it is conceivable that the optical performance is lowered by shifting the lens, and even if a parallax image can be acquired, the image quality may be lowered.
Further, the three-dimensional image forming apparatus disclosed in Patent Document 2 has a problem that the apparatus is first enlarged. Further, since the entire lens frame is moved, a large time lag occurs in photographing from two directions, and therefore, it is not suitable for an apparatus for acquiring an ornamental image such as a digital camera.

  The present invention has been made in view of the above, and it is possible to obtain a parallax image with a single optical system that can obtain a parallax image with a good image quality with a small configuration without significant cost increase. The object is to provide a device that can be obtained.

  In order to solve the above-described problems and achieve the object, a parallax image acquisition device according to the present invention has a lens housing and a plurality of lenses installed in the lens housing, and captures a subject image on an image sensor. An imaging optical system that forms an image and an optical surface that is disposed in front of the imaging optical system, and takes either a first optical axis that provides a first subject image or a second optical axis that provides a second subject image And an optical axis variable member that adjusts the optical surface as the system has, and the first subject image and the second subject image are parallax images of the subject.

  In the parallax image acquisition device according to the present invention, the optical axis variable member has one first incident plane and one first exit plane, and is disposed on the front surface of the imaging optical system; It is preferable that the first incident plane and the first emission plane form a predetermined angle with each other.

  In the parallax image acquisition device according to the present invention, the predetermined angle is preferably 0.1 ° or more and 3 ° or less.

  In the parallax image acquisition device according to the present invention, the first optical element is preferably an optical glass member.

  In the parallax image acquisition device according to the present invention, the first optical element is preferably a resin member.

  In the parallax image acquisition device according to the present invention, the drive unit inserts the first optical element into the front surface of the imaging optical system when giving the first subject image, and takes the first optical element when taking the second subject image. It is preferred to retract from the front of the system.

  In the parallax image acquisition device according to the present invention, the optical axis variable member further includes a second optical element having one second incident plane and one second exit plane, and disposed adjacent to the first optical element. And the driving unit further drives the second optical element, and the second incident plane and the second emission plane form a predetermined angle with each other, and the first optical element and the second optical element capture the image of the subject. It is preferably symmetric with respect to an axis through the element.

  In the parallax image acquisition device according to the present invention, when the first subject image is taken, the drive unit inserts the first optical element into the front surface of the imaging optical system and retracts the second optical element from the front surface of the imaging optical system. When the second subject image is taken, it is preferable to retract the first optical element from the front surface of the imaging optical system and insert the second optical element into the front surface of the imaging optical system.

  In the parallax image acquisition device according to the present invention, the driving unit preferably includes a pedestal unit that fixes the first optical element and the second optical element, and a rotation urging unit that urges the pedestal unit to rotate. .

  In the parallax image acquisition device according to the present invention, it is preferable that the first subject image and the second subject image are parallax images in the horizontal direction of the subject.

  In the parallax image acquisition device according to the present invention, the imaging optical system is preferably a coaxial optical system.

  In the parallax image acquisition device according to the present invention, the imaging optical system is preferably a folding system.

  The parallax image acquisition device according to the present invention can acquire a parallax image having a good image quality with a small and inexpensive configuration, and can thereby acquire a high-quality stereoscopic image.

1 is a block diagram illustrating a configuration of a digital camera according to a first embodiment of the present invention. It is sectional drawing which shows the structure in the lens housing | casing of the lens module in 1st Embodiment along the optical axis Ax. It is the figure which looked at the more specific internal structure of the lens housing | casing of the lens module in 1st Embodiment from the side. It is the figure which looked at FIG. 3 from the front. It is the conceptual diagram which looked at the digital camera which concerns on 1st Embodiment when acquiring a parallax image from the side. It is a flowchart which shows the flow of the parallax image acquisition method in 1st Embodiment. It is the figure which looked at the more specific internal structure of the lens housing | casing of the lens module which concerns on 2nd Embodiment from the side. It is the figure which looked at FIG. 7 from the front. It is sectional drawing which shows the structure of the optical system of the parallax image acquisition apparatus which concerns on 3rd Embodiment. It is sectional drawing which shows the structure of the optical system of the parallax image acquisition apparatus which concerns on 4th Embodiment.

Hereinafter, an embodiment of a parallax image acquisition device according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by the following embodiment.
In the parallax image acquisition device according to the present invention, a wedge prism is arranged in front of the optical system, and a parallax image is generated by the refraction action of the wedge prism.

(First embodiment)
FIG. 1 is a block diagram showing a configuration of a digital camera 100 according to the first embodiment of the present invention.
A digital camera 100 as a parallax image acquisition device includes a lens module 110 and a camera body 170 to which the lens module 110 can be attached and detached.
In the lens module 110, a plurality of lenses (focus lenses) 111, 112, and 113 as an imaging optical system, a wedge prism 121 as a first optical element, and an imaging element 120 are first in a lens housing 110a. The lens 111, the second lens 112, and the third lens 113 are arranged along the optical axis Ax. Further, a member driving unit 155 as a driving unit for driving the wedge prism 121 is disposed in the lens housing 110a.

  The camera body 170 includes a 3D format conversion unit 142, an output processing unit 143, a recording unit 144, an instruction unit 145, a system control unit 150, and a member control unit 154.

The first lens 111, the second lens 112, and the third lens 113 are arranged in order from the object side to the image side, and in accordance with an instruction signal from the system control unit 150, a lens driving unit (not shown) optical axis Ax. Driven along.
The first lens 111, the second lens 112, and the third lens 113 form a subject image on the image sensor 120. The image sensor 120 photoelectrically converts the subject image formed on the imaging surface to generate an electrical image signal.

  When the instruction unit 145 selects the 3D mode, the 3D format conversion unit 142 is set to the 3D mode by the system control unit 150. The 3D format conversion unit 142 performs 3D format conversion corresponding to the set mode, and generates a stereoscopic image from the parallax image acquired by the image sensor 120. As the 3D format conversion, for example, SIDE BY SIDE, LINE BY LINE, ABOVE-BELOW, and CHECKERBOARD are used.

  The output processing unit 143 outputs an image processed for display by the image processing unit 140 (including an image subjected to 3D format conversion) to an external display device such as a TV. Furthermore, an image output process to a display device that displays a menu related to the operation of the digital camera 100 is also performed.

  The recording unit 144 stores the image data converted into the 3D format by the 3D format conversion unit 142 in a nonvolatile manner, and is configured as a removable memory that can be carried out of the digital camera 100 such as a memory card. Therefore, the recording unit 144 may not have a configuration unique to the digital camera 100.

  The instruction unit 145 is a user interface for performing an operation input to the digital camera 100, and is for setting a power button for instructing power on / off, a photographing button for instructing photographing start, a 3D mode, and the like. Imaging mode setting buttons, and various other setting buttons.

The member drive unit 155 includes a pedestal part 131 to which the wedge prism 121 is fixed, and a rotation urging part 133 that enables the pedestal part 131 to rotate around the drive shaft 132 (FIG. 4).
The member control unit 154 outputs a control signal to the member driving unit 155 in accordance with an instruction signal from the system control unit 150. Receiving this control signal, the member driving unit 155 rotationally drives the rotation urging unit 133 so that the wedge prism 121 is disposed at either the position on the optical axis Ax or the position off the optical axis Ax. .
Here, the wedge prism 121 and the member driving unit 155 constitute an optical axis variable member.

  FIG. 2 is a cross-sectional view taken along the optical axis Ax, showing the configuration inside the lens housing 110a of the lens module 110. As shown in FIG. FIG. 2 shows a state in which the wedge prism 121 is disposed on the optical axis Ax. In addition, illustration of the member drive part 155 is abbreviate | omitted in FIG. FIG. 3 is a side view of a more specific internal configuration of the lens housing 110 a of the lens module 110. FIG. 4 is a view of FIG. 3 as viewed from the front. FIG. 3 shows a state in which the wedge prism 121 is on the optical axis Ax.

The wedge prism 121 is preferably a glass member having a refractive index of about 1.5, and is made of, for example, a glass material such as BK7. The wedge prism 121 has a first incident plane 122 and a first emission plane 123 as optical surfaces arranged on the front side of the first lens 111. The first incident plane 122 and the first emission plane 123 are sequentially arranged from the front along the optical axis Ax, and form a predetermined angle θ with respect to each other. Therefore, when the light ray enters the wedge prism 121 from the air, it is refracted by the refraction action and further refracted by the refraction action at the exit surface, so that the angle of the light ray can be changed between the incident side and the exit side. If this angle θ is not less than 0.1 ° and not more than 3 °, the occurrence of chromatic aberration can be reduced, and this angle range is desirable. In addition, the wedge prism 121 is preferably disposed on the incident side from the object side to the first lens 111.
Here, the front side is the object side, and the rear side is the image plane side.

  Due to the rotation of the rotation urging unit 133, the wedge prism 121 supported by the pedestal unit 131 is located on the optical axis Ax (position P1 in FIG. 4) and is displaced from the optical axis Ax (position P2 in FIG. 4). ). For this reason, the angle of the light beam incident on the first lens 111 from the object side can be changed depending on the position of the wedge prism 121. That is, by adjusting the position of the optical surface of the wedge prism 121 with respect to the optical axis Ax by driving the member driving unit 155, when the wedge prism 121 is on the optical axis Ax, the first subject image with respect to the image sensor 120 is displayed. When the wedge prism 121 is located away from the optical axis Ax, the second optical axis that gives a second subject image different from the first subject image to the image sensor 120 is provided. Is configured. In the former case, the light beam L1 (FIG. 2) incident on the wedge prism 121 travels on the first optical axis along the optical axis Ax after being refracted and emitted from the wedge prism 121, and in the latter case, the light beam L2 (FIG. 2). ) Travels on the optical axis Ax along the second optical axis perpendicular to the image sensor 120. Accordingly, since parallax occurs between the first subject image and the second subject image, these subject images become parallax images of the subject, and stereoscopic viewing is possible by reproducing these two images. The parallax image obtained here is a parallax image in the horizontal direction (left-right direction in FIGS. 1 to 3) according to the shape and arrangement direction of the wedge prism 121, but the shape and arrangement direction of the wedge prism 121 are changed. Thus, a parallax image in a desired direction other than horizontal can be obtained.

  Next, a parallax image acquisition method using the digital camera 100 will be described with reference to FIGS. 5 and 6. Here, FIG. 5 is a conceptual diagram of the digital camera 100 viewed from the side when the parallax image is acquired. FIG. 6 is a flowchart showing the flow of the parallax image acquisition method. In FIG. 5, the light rays incident on the lens module 110 are simply displayed.

  When the user operates the instruction unit 145 to activate the camera and set the shooting mode (still image), imaging starts. Subsequently, since it is the same as that of the existing camera, detailed description is omitted, but the user sets the imaging condition corresponding to the shooting environment and the shooting mode. Imaging conditions include, for example, an aperture, shutter speed, ISO sensitivity, and focal length.

  Next, the system control unit 150 determines whether or not the mode selected by the user is the 3D mode (step S101). If the selected mode is the 2D (two-dimensional) mode (N in step S101), the image is captured like an existing 2D camera without performing stereoscopic imaging (step S201).

On the other hand, when the 3D mode is selected (Y in step S101), the state shifts to a state where stereoscopic imaging is possible.
Processing of AE (automatic exposure), AF (autofocus), and AWB (auto white balance) is executed by an existing method to display a through image (step S102).
Here, since AE, AF, and AWB are performed by an existing method, description thereof is omitted.

  Subsequently, the system control unit 150 determines whether or not the release button has been half-pressed (step S103). While the release button is not pressed halfway (N in step S103), the AE, AF, and AWB processes (step S102) are repeatedly executed, and the processing results are sequentially updated.

  If the release button is pressed halfway (Y in step S103), AE, AF, and AWB processes are executed (step S104). This process is executed by an existing method as in step S102 and stored in the recording unit 144.

The processes from step S102 to S104 are repeated until the release button is fully pressed (while N in step S105).
When the release button is fully pressed by the user (Y in step S105), the system control unit 150 executes acquisition of the first image for stereoscopic imaging (first imaging) (step S106). Here, the first image is the second subject image acquired in a state where the wedge prism 121 is disposed at a position off the optical axis Ax. Further, in the first photographing, since the light beam enters the first lens 111 without passing through the wedge prism 121, an image similar to the normal 2D photographing can be obtained.

  When the first imaging is finished, the system control unit 150 drives the member driving unit 155 as a light beam control member to place the wedge prism 121 on the optical axis Ax (step S107), and the second image of the stereoscopic imaging Acquisition (second imaging) is executed (step S108). Here, the second image is the first subject image acquired with the wedge prism 121 on the optical axis Ax.

When the second imaging (step S108) is completed, the system control unit 150 instructs the member control unit 154 to drive the member driving unit 155 to move the wedge prism 121 to a position off the optical axis Ax. A signal is transmitted (step S111).
In addition, the system control unit 150 causes the 3D format conversion unit 142 to perform 3D format conversion on the images acquired by the first shooting and the second shooting (step S109). The converted data is recorded in the recording unit 144 (step S110).

  When the parallax images (first subject image and second subject image) stored as described above are output from the output processing unit 143 to the external display device and played back, stereoscopic viewing becomes possible. In the digital camera 100, the wedge prism 121 supported by the pedestal 131 is switched between the two optical axes by moving it in and out of the optical axes Ax of the first lens 111, the second lens 112, and the third lens 113. Since the optical axis along the optical axis Ax is a common optical system, the apparatus is not increased in size and a high-quality parallax image can be acquired.

(Second Embodiment)
A parallax image acquisition apparatus according to the second embodiment will be described with reference to FIGS. 7 and 8.
The parallax image acquisition device according to the second embodiment is different from the parallax image acquisition device according to the first embodiment in that two optical axis variable members are used. Other configurations are the same as those of the parallax image acquisition device according to the first embodiment, and the same reference numerals are used for the same members, and detailed descriptions thereof are omitted.

  FIG. 7 is a side view of a more specific internal configuration of the lens housing 210a of the lens module 210 according to the second embodiment. FIG. 8 is a front view of FIG. FIG. 7 shows a state where the first wedge prism 221 and the second wedge prism 222 are on the optical axis Ax of the first lens 111, the second lens 112, and the third lens 113.

  The lens module 210 includes a plurality of lenses (focus lenses) 111, 112, and 113 as an imaging optical system, a first wedge prism 221 as a first optical element, and a second optical element in a lens housing 210a. The second wedge prism 222 and the image sensor 120 are arranged along the optical axis Ax of the first lens 111, the second lens 112, and the third lens 113. 7 and 8, the illustration of the image sensor 120 is omitted.

Furthermore, a first member driving unit 255 that drives the first wedge prism 221 and a second member driving unit 256 that drives the second wedge prism 222 are arranged in the lens housing 210a.
The first member drive unit 255 includes a first pedestal portion 231 to which the first wedge prism 221 is fixed, and a first rotation urging portion that enables the first pedestal portion 231 to rotate around the first drive shaft 232. 233. The second member driving unit 256 includes a second pedestal 241 to which the second wedge prism 222 is fixed, and a second rotation urging unit that allows the second pedestal 241 to rotate around the second drive shaft 242. 243.

The first member driving unit 255 and the second member driving unit 256 receive the control signal from the member control unit 154 (FIG. 1) and arrange the first wedge prism 221 and the second wedge prism 222 on the optical axis Ax, respectively. Alternatively, the drive unit is retracted from the optical axis Ax. The first member drive unit 255 and the second member drive unit 256 may be separate drive units that rotate the first wedge prism 221 and the second wedge prism 222, respectively, or the first wedge prism 221 and the second wedge prism. It is good also as a drive part common to rotation of 222. FIG.
Here, each of the first wedge prism 221 and the first member driving unit 255, and the second wedge prism 222 and the second member driving unit 256 constitutes an optical axis variable member.

Each of the first wedge prism 221 and the second wedge prism 222 is preferably a glass member having a refractive index of about 1.5, and is made of a glass material such as BK7.
The first wedge prism 221 has a first incident plane 221 a and a first exit plane 221 b as optical surfaces arranged on the front side of the first lens 111. The first incident plane 221a and the first emission plane 221b are sequentially arranged from the front along the optical axis Ax, and form a predetermined angle θ with respect to each other.
Further, the second wedge prism 222 has a second incident plane 222a and a second exit plane 222b as optical surfaces arranged on the front side of the first lens 111. The second incident plane 222a and the second exit plane 222b are sequentially arranged from the front along the optical axis Ax, and form a predetermined angle θ with respect to each other.

  The second wedge prism 222 is disposed on the front side of the first wedge prism 221. The first wedge prism 221 and the second wedge prism 222 are both arranged so that the wedge shapes are alternated when arranged on the optical axis Ax. Further, the first wedge prism 221 and the second wedge prism 222 are arranged so as to be symmetric with respect to the optical axis Ax that is an axis passing through the subject and the image sensor 120.

  In each of the first wedge prism 221 and the second wedge prism 222, light incident from the air is refracted by the refraction action, and further refracted by the refraction action on the exit surface. The angle can be changed. If the angle θ is not less than 0.1 ° and not more than 3 °, the occurrence of chromatic aberration can be reduced, and this angle range is desirable. Further, the first wedge prism 221 and the second wedge prism 222 are preferably arranged on the incident side from the object side to the first lens 111.

  The first rotation urging unit 233 is driven to rotate around the first drive shaft 232 in accordance with a control signal from the member control unit 154. The first wedge prism 221 supported by the first pedestal portion 231 is displaced from the position on the optical axis Ax (position P11 in FIG. 8) and the optical axis Ax by the rotation of the first rotation urging portion 233. It arrange | positions in either of the positions (position P12 of FIG. 8). Further, the second rotation urging unit 243 is driven to rotate around the second drive shaft 242 in accordance with a control signal from the member control unit 154. Due to the rotation of the second rotation urging portion 243, the second wedge prism 222 supported by the second pedestal portion 241 deviates from the position on the optical axis Ax (position P21 in FIG. 8) and the optical axis Ax. It arrange | positions in either of the positions (position P22 of FIG. 8).

By such movement of the first wedge prism 221 and the second wedge prism 222, the angle of the light beam incident on the first lens 111 from the object side can be changed. That is, by adjusting the positions of the optical surfaces of the first wedge prism 221 and the second wedge prism 222 with respect to the optical axis Ax by driving the first member drive unit 255 and the second member drive unit 256, for example, the first wedge drive unit When the prism 221 is on the optical axis Ax and the second wedge prism 222 is retracted from the optical axis Ax, a first optical axis that provides a first subject image to the image sensor 120 is configured, When the first wedge prism 221 and the second wedge prism 222 are on the optical axis Ax, a second optical axis that provides a second subject image different from the first subject image to the image sensor 120 is configured. In the former, the light beam incident on the first wedge prism 221 is refracted and emitted from the first wedge prism 221 along the first optical axis that is not perpendicular to the imaging surface of the image sensor 120 and then to the image sensor 120. In the latter case, the light beam travels on the optical axis Ax along the second optical axis perpendicular to the image sensor 120. As a result, a parallax occurs between the first subject image and the second subject image, and stereoscopic viewing is possible by reproducing these two images.
Note that the positions of the first wedge prism 221 and the second wedge prism 222 with respect to the optical axis Ax are not limited to the example described above, and the first optical axis and the second optical axis are the first wedge prism 221 and the second wedge prism 222, respectively. It can be arbitrarily determined according to the position.
In addition, about another structure, an effect | action, and an effect, it is the same as that of 1st Embodiment.

(Third embodiment)
FIG. 9 is a cross-sectional view showing the configuration of the optical system of the parallax image acquisition device according to the third embodiment.
The parallax image acquisition device according to the third embodiment is different from the parallax image acquisition device according to the first embodiment in that a bending optical system is used as the optical system. Other configurations are the same as those of the parallax image acquisition device according to the first embodiment, and detailed description of the same members is omitted.

  As shown in FIG. 9, the wedge prism 321 (optical axis variable member) as the first optical element in the third embodiment has the same configuration as the wedge prism 121 of the first embodiment, and includes the bending optical system 301. It is arranged in front of the most object side surface. The wedge prism 321 is supported by the pedestal portion 131 in the same manner as the wedge prism 121 of the first embodiment, and the wedge prism 321 is driven on the optical axis Ax2 of the bending optical system 301 by driving the member driving portion 155. Or a position deviating from the optical axis Ax2. Thus, when the wedge prism 321 is on the optical axis Ax2, the first optical axis for providing the first subject image to the image sensor 120 is configured, and the wedge prism 321 is at a position off the optical axis Ax. Constitutes a second optical axis that gives the image sensor 120 a second subject image different from the first subject image. Since a parallax occurs between the first subject image and the second subject image, a stereoscopic view is possible by reproducing these two images.

Here, similarly to the second embodiment, a wedge prism as a second optical element may be added, and the first optical axis and the second optical axis may be configured using two wedge prisms.
Other configurations, operations, and effects are the same as those in the first embodiment.

(Fourth embodiment)
FIG. 10 is a cross-sectional view showing the configuration of the optical system of the parallax image acquisition device according to the fourth embodiment.
The parallax image acquisition device according to the fourth embodiment is different from the parallax image acquisition device according to the first embodiment in that a DOE (Differential Optical Element) is used as the first optical element. Other configurations are the same as those of the parallax image acquisition device according to the first embodiment, and detailed description of the same members is omitted.

The DOE 421 is a diffraction grating formed such that a plurality of grooves are parallel to each other along a direction perpendicular to the optical axis Ax of the first lens 111, the second lens 112, and the third lens 113. The DOE 421 is disposed on the front surface side of the first lens 111 and controls incident light using a light diffraction phenomenon. The incident light beam is diffracted at different angles depending on the order, but the diffraction efficiency of a specific order can be enhanced by the shape of the groove. In other words, the angle of the incident light beam can be deflected to a specific angle. Therefore, as shown in FIG. 10, by disposing the DOE 421 on the front surface of the optical system, it is possible to control the angle of the optical axis and acquire a parallax image.
In addition, about another structure, an effect | action, and an effect, it is the same as that of 1st Embodiment.

  As described above, the parallax image acquisition device according to the present invention is useful in terms of acquiring a parallax image with a good image quality without a significant increase in cost with a small configuration.

DESCRIPTION OF SYMBOLS 100 Digital camera 110 Lens module 110a Lens housing 111 1st lens 112 2nd lens 113 3rd lens 120 Image pick-up element 121 Wedge prism 122 1st entrance plane 123 1st exit plane 131 Base part 132 Drive shaft 133 Rotation biasing part 140 Image processing unit 142 3D format conversion unit 143 Output processing unit 144 Recording unit 145 Instruction unit 150 System control unit 154 Member control unit 155 Member driving unit 170 Camera body 210 Lens module 210a Lens housing 221 First wedge prism 221a First incident plane 221b First exit plane 222 Second wedge prism 222a Second entrance plane 222b Second exit plane 231 First pedestal portion 232 First drive shaft 233 First rotation biasing portion 241 Second pedestal portion 242 Second drive Axis 243 second bending rotation urging unit 255 first member driving unit 256 second member driving unit 301 an optical system 321 wedge prism

Claims (12)

A lens housing;
An imaging optical system that has a plurality of lenses installed in the lens housing and forms a subject image on the imaging device;
The imaging optical system has an optical surface disposed in front of the imaging optical system, and the imaging optical system has either a first optical axis that provides a first subject image or a second optical axis that provides a second subject image. An optical axis variable member for adjusting the optical surface;
Have
The parallax image acquisition apparatus, wherein the first subject image and the second subject image are parallax images of the subject. The optical axis variable member is
A first optical element having one first incident plane and one first exit plane and disposed in front of the imaging optical system;
A drive unit for driving the first optical element;
Have
The parallax image acquisition apparatus according to claim 1, wherein the first incident plane and the first emission plane form a predetermined angle with each other.   The parallax image acquisition apparatus according to claim 2, wherein the predetermined angle is not less than 0.1 ° and not more than 3 °.   The parallax image acquisition apparatus according to claim 2, wherein the first optical element is an optical glass member.   The parallax image acquisition apparatus according to claim 2, wherein the first optical element is a resin member.   The drive unit inserts the first optical element into the front surface of the imaging optical system when giving the first subject image, and puts the first optical element into the front surface of the imaging optical system when giving the second subject image. The parallax image acquisition device according to claim 2, wherein the parallax image acquisition device according to claim 2 is saved. The optical axis variable member further includes a second optical element having one second incident plane and one second exit plane, and disposed adjacent to the first optical element,
The driving unit further drives the second optical element;
The second incident plane and the second emission plane are at the predetermined angle with each other,
The parallax image according to any one of claims 2 to 5, wherein the first optical element and the second optical element are symmetrical with respect to an axis passing through the subject and the imaging element. Acquisition device.   When the first subject image is taken, the driving unit inserts the first optical element into the front surface of the imaging optical system and retracts the second optical element from the front surface of the imaging optical system. The parallax according to claim 7, wherein when a subject image is taken, the first optical element is retracted from the front surface of the imaging optical system, and the second optical element is inserted into the front surface of the imaging optical system. Image acquisition device.   The said drive part has the base part which fixes the said 1st optical element and the said 2nd optical element, and the rotation urging part which urges | biases a rotational movement to the said pedestal part, The 7 or characterized by the above-mentioned. The parallax image acquisition device according to claim 8.   The parallax image acquisition apparatus according to any one of claims 1 to 9, wherein the first subject image and the second subject image become a parallax image of the subject in a horizontal direction.   The parallax image acquisition apparatus according to any one of claims 1 to 10, wherein the imaging optical system is a coaxial optical system.   The parallax image acquisition device according to any one of claims 1 to 10, wherein the imaging optical system is a bending system.

Images