JP2010128308A - Optical device and imaging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To photograph a best stereoscopic photograph of a subject in an optional photographing distance. <P>SOLUTION: There are provided a first deflection member 21 for deflecting a first light beam from an object incident into a first view field of an optical system 3, a second deflection member 22 for deflecting a second light beam having a parallax with respect to the first light beam from the object to be incident into a second view field different from the first view field of the optical system 3, and regulation means 24, 25 for regulating deflection directions in at least one of the first deflection member 21 and the second deflection member 22. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical apparatus and an imaging apparatus for stereoscopic photography.

2. Description of the Related Art There is known a stereoscopic photography optical device that is mounted on a photographing lens of a camera and forms two images having parallax side by side on an imaging surface. Thereby, for example, two images taken with a reversal film can be stereoscopically viewed using a twin-lens viewer (see, for example, Patent Document 1).
Japanese Unexamined Patent Publication No. 07-152096

  However, the above-described conventional stereoscopic photography optical device has a problem that the best stereoscopic photography can be obtained only at a specific subject distance.

(1) The invention according to claim 1 deflects the first light beam that deflects the first light beam from the object and enters the first field of view of the optical system, and the second light beam that has parallax from the first light beam from the object. A second deflecting member that is incident on a second field of view different from the first field of view of the optical system, and an adjusting unit that adjusts the deflection direction of at least one of the first deflecting member and the second deflecting member.
(2) According to a second aspect of the present invention, in the optical device according to the first aspect, the first deflection member has a first reflection surface, and the second deflection member has a second reflection surface facing the first reflection surface. The adjusting means adjusts a relative angle between the first reflecting surface and the second reflecting surface.
(3) According to a third aspect of the present invention, in the optical device according to the first or second aspect, the adjusting means includes a deflection direction of the first light beam by the first deflection member and a deflection of the second light beam by the second deflection member. Adjust the direction evenly.
(4) According to a fourth aspect of the present invention, in the optical device according to any one of the first to third aspects, the optical system is adjustable in focus, and the adjusting means is deflected in accordance with the focus adjustment state of the optical system. Adjust the direction.
(5) The invention of claim 5 is an image pickup apparatus comprising the optical device according to any one of claims 1 to 4 and an image pickup element for picking up an image by the optical system.
(6) According to a sixth aspect of the present invention, in the imaging device according to the fifth aspect, the adjusting means adjusts the deflection direction of at least one of the first deflecting member and the second deflecting member, so that the image sensor with respect to the optical system The image of the first visual field and the image of the second visual field are made to coincide with each other at a position on the object side conjugate with the image.
(7) According to a seventh aspect of the present invention, in the imaging apparatus according to the fifth or sixth aspect, the image pickup apparatus further includes a focus detection unit that detects a focus adjustment state of the optical system, and the adjustment unit is a focus detection result by the focus detection unit The change direction of at least one of the first and second change members is adjusted according to the position of the optical system in the optical axis direction.

  According to the present invention, the best three-dimensional photograph can be taken with respect to a subject at an arbitrary photographing distance.

  An embodiment in which the present invention is applied to a digital camera will be described. The present invention is not limited to a digital camera, and can be applied to, for example, a film camera.

  FIG. 1 is a cross-sectional view showing the structure of a digital camera according to an embodiment. A digital camera 1 according to an embodiment includes an optical adapter 2 for photographing a three-dimensional photograph, a photographing lens 3 and a camera body 4. The stereoscopic adapter 2 is configured to be detachable from the front end of the photographic lens 3, and the photographic lens 3 is configured to be detachable from the camera body 4.

  The optical adapter 2 for stereoscopic photography has a pair of first optical path deflecting mirror 21 and second optical path deflecting mirror 22 arranged opposite to each other, and the center of these optical path deflecting mirrors 21 and 22 (the optical axis of the photographing lens 3). A first actuator 24 that adjusts the optical path deflection angle of the first optical path deflection mirror 21, and a second actuator 25 that adjusts the optical path deflection angle of the second optical path deflection mirror 22. A photographing field of the photographing lens 3 is divided into two at the center, and a first image and a second image having parallax are separately formed. The photographing lens 3 includes a lens 31, a diaphragm 32, a drive control device 33 that drives and controls these optical members, and the like. Furthermore, the camera body 4 includes an image sensor 41 such as a CCD or CMOS, a control device 42, and the like.

  FIG. 2A is a cross-sectional view of the photographing light beam in a plane including the optical axis L of the photographing lens 3, and shows a photographing optical path. As shown in FIG. 2A, the first optical path deflecting mirror 21, the second optical path deflecting mirror 22, and the prism 23 of the optical adapter 2 for stereoscopic photography are used to convert the light flux from the subject into the first field of view taken by the taking lens. And enter the second visual field in half. The first light beam from the subject is reflected by the first optical path deflecting mirror 21 and the prism 23, enters the first field of view of the photographing lens 3, is guided to the imaging surface 41a of the imaging element 41, and is shown in FIG. Thus, the first image of the subject is formed on the imaging surface. Similarly, the second light beam from the subject is reflected by the second optical path deflecting mirror 22 and the prism 23, enters the second field of view of the photographing lens 3, and is guided to the imaging surface 41a of the imaging element 41, as shown in FIG. ), A second image having a parallax with the first image of the subject is formed on the imaging surface. In this embodiment, as shown in FIG. 2B, the light beam reaching the center of the first image is called the central light beam of the first field of view, and the light beam reaching the center of the second image is the center light beam of the second field of view. Call it.

  The first actuator 24 adjusts the optical path deflection angle of the first optical path deflection mirror 21, and the second actuator 25 adjusts the optical path deflection angle of the second optical path deflection mirror 22. These first actuator 24 and second actuator 25 can change the direction of the subject luminous flux incident on the first visual field and the second visual field. FIG. 3 shows a photographing optical path when a light beam from an object at infinity is incident on the first and second visual fields of the photographing lens. FIG. 4 shows a light beam from a subject at a finite subject distance. The imaging optical path when entering the second field of view is shown. The first actuator 24 and the second actuator 25 drive and control the optical path deflection angles of the first optical path deflection mirror 21 and the second optical path deflection mirror 22 in accordance with a command signal from the control device 42 of the camera body 4.

  The drive control device 33 for the photographic lens 3 includes a microcomputer and an actuator (not shown), and performs focus adjustment of the lens 31 and aperture adjustment of the diaphragm 32 in accordance with a command signal from the control device 42 of the camera body 4.

  The image pickup device 41 of the camera body 4 picks up the first image and the second image formed on the image pickup surface by the optical adapter 2 for taking a three-dimensional photograph and the taking lens 3, and outputs an image signal. In the imaging element 41, a large number of imaging pixels are two-dimensionally arranged on the imaging surface, and a plurality of focus detection pixels are arranged in a part of the imaging pixel arrangement. Each of these focus detection pixels includes a microlens and a pair of photoelectric conversion elements, and receives a light beam that has passed through a pair of regions of the exit pupil of the lens 31. The control device 42 detects the focus adjustment state (defocus amount) of the lens 31 by a so-called pupil division phase difference detection method based on the focus detection signals output from the pair of photoelectric conversion elements of the focus detection pixels. Based on the focus detection result, the driving amount of the lens 31 is calculated, and a lens driving command signal is output to the driving control device 33 of the photographing lens 3.

  The drive control device 33 for the photographic lens 3 controls the drive of the lens 31 according to the lens drive command signal, detects the position of the lens 31, and outputs it to the control device 42 of the camera body 4. The control device 42 calculates the subject distance (shooting distance) based on the defocus amount and detection position of the lens 31, and determines the optical path deflection angles of the first optical path deflection mirror 21 and the second optical path deflection mirror 22 according to the subject distance. Calculate. Then, an optical path deflection angle command signal is output to the first actuator 24 and the second actuator 25, and the optical path deflection angles of the first optical path deflection mirror 21 and the second optical path deflection mirror 22 are adjusted.

  For example, when the subject distance calculated based on the defocus amount and the detection position of the lens 31 is infinity, as shown in FIG. 3, the luminous flux from the subject at infinity with respect to the first visual field and the second visual field. The first optical path deflecting mirror 21 so that the image of the first field of view coincides with the image of the second field of view at a position (infinite position) on the object side conjugate with the image sensor 41 with respect to the photographing lens 3. The optical path deflection angle of the second optical path deflection mirror 22 is adjusted. If the calculated subject distance is finite, the first field of view and the second field of view overlap at the position of the subject distance on the optical axis L of the lens 31, as shown in FIG. 3, the optical paths of the first optical path deflecting mirror 21 and the second optical path deflecting mirror 22 so that the image of the first field of view coincides with the image of the second field of view at a position on the subject side (finite position) conjugate with the image sensor 41. Adjust the deflection angle evenly.

  As described above, according to the embodiment, it is possible to take the best stereoscopic photograph of the subject at an arbitrary shooting distance.

Sectional drawing which shows the structure of the digital camera of one embodiment The figure which shows the imaging | photography optical path of one Embodiment The figure which shows the imaging | photography optical path in the case of making the light beam from the infinity subject enter into the 1st, 2nd visual field of a taking lens The figure which shows the imaging | photography optical path in the case of making the light beam from the object in a finite object distance enter into the 1st, 2nd visual field of an imaging lens

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Digital camera, 2; Optical adapter for stereo photography, 3; Shooting lens, 21; 1st optical path deflection mirror, 22: 2nd optical path deflection mirror, 23; Prism, 24; 1st actuator, 25; 33; drive control device, 41; imaging device, 42; control device

Claims (7)

A first deflecting member for deflecting a first light beam from an object to be incident on a first field of view of the optical system;
A second deflecting member that deflects the first light flux from the object and a second light flux having a parallax to enter a second visual field different from the first visual field of the optical system;
An optical apparatus comprising: an adjusting unit that adjusts a deflection direction of at least one of the first deflection member and the second deflection member. The optical device according to claim 1.
The first deflecting member has a first reflecting surface;
The second deflecting member has a second reflecting surface facing the first reflecting surface;
The optical device is characterized in that the adjusting means adjusts a relative angle between the first reflecting surface and the second reflecting surface. The optical device according to claim 1 or 2,
The optical device is characterized in that the adjusting means uniformly adjusts the deflection direction of the first light beam by the first deflection member and the deflection direction of the second light beam by the second deflection member. In the optical device according to any one of claims 1 to 3,
The optical system is adjustable in focus;
The optical device according to claim 1, wherein the adjusting means adjusts the deflection direction according to a focus adjustment state of the optical system. An optical device according to any one of claims 1 to 4,
An image pickup apparatus comprising: an image pickup device that picks up an image by the optical system. The imaging apparatus according to claim 5,
The adjusting means adjusts the deflection direction of at least one of the first deflecting member and the second deflecting member to thereby adjust the first visual field at a position on the object side conjugate with the imaging device with respect to the optical system. An image pickup apparatus characterized by matching an image with an image of the second visual field. In the imaging device according to claim 5 or 6,
A focus detection means for detecting a focus adjustment state of the optical system;
The adjusting means adjusts the changing direction of at least one of the first and second changing members according to a focus detection result by the focus detecting means and a position of the optical system in the optical axis direction. An imaging device.

Images