KR0182095B1 - Stereo camera - Google Patents

Abstract

The stereo camera of the present invention includes a mechanism for automatically adjusting the distance between the optical axes of the photographing lenses and a manual adjustment mechanism so that the quick shooting function and the stereoscopic effect correction function are compatible. Lens shift cams are symmetrically installed on the base frame of the stereo camera and pressed by a spring so that the lens shift cams are in pressure contact with the left and right lens plates independently of each other. The lens shift cams are configured to automatically match the shooting ranges of the left and right photographing lenses at the focal length by focusing, irrespective of the feeding amounts of the photographing lenses, and the distance between the optical axes is automatically adjusted in conjunction with the focusing. . In the case where objects in the distant range and the near range coexist, fine adjustment is performed to the optimum distance between the optical axes by adjusting the manual adjustment lens shift knob to move the lens plates toward each other.

Description

Stereo camera

The present invention relates to a stereo camera, and more particularly to a stereo camera having a mechanism for adjusting the distance between the optical axis of two photographic lenses.

In general, in a stereo camera, the distance between the optical axes of two photographic lenses is fixed so that two photographs can be taken simultaneously by a pair of left and right photographic lenses. In the case of this type of stereo camera with a fixed distance between optical axes, as the object distance becomes shorter, the positional deviation of the object in the left and right pictures increases due to the parallax of the two photographic lenses, and the stereoscopic picture of the left and right pictures. The non-overlapping area increases outside of the area. These non-overlapping areas are unobtrusive when mounted on a three-dimensional slide mount by a three-dimensional slide viewer so that a photographic film can be used, and thus, various types of three-dimensional slide mounts having different window widths. Is used to select a three-dimensional slide fitting having a suitable window width therefrom to shield the non-overlapping areas of the left and right pictures. Therefore, the loss of the photograph is large and the shielding amount of the photograph becomes large upon mounting, and axial positioning is not easy.

Therefore, the inventor of the present invention has provided a reflective stereo camera in which the distance between the optical axes of two photographic lenses is adjustable so that the result of parallax correction can be visually confirmed by a finder. In the case of such a stereo camera, the distance between the optical axes of the photographic lenses can be adjusted to match the collimation marks displayed at the same positions of the left and right focus plates so that non-overlapping portions of the left and right photographs can be eliminated. Therefore, it is possible to form a three-dimensional slide having an optimal three-dimensional effect without a picture loss.

The inventor of the present invention also has a synthetic prism that improves visibility by allowing the left and right photographs to be observed by one eye by symmetrically inverting the outer photographic halves of the photographing ranges of the left and right lenses to synthesize one upright image. It has been proposed a reflective stereo camera having a.

In this stereo camera, a mechanism for adjusting the distance between the optical axes of the photographing lenses and a focusing mechanism are interlocked so as to automatically adjust the parallax according to the shooting distance.

The stereo camera having the above-described focusing mechanism linked to each other and a mechanism for automatically adjusting the distance between the optical axes can automatically adjust the distance between the optical axes regardless of the shooting distance, thereby reducing the loss of the stereoscopic imaging area. It can be reduced and has an excellent effect on snapshots. However, few objects in the pictures are located at the same distance, and various distance objects coexist frequently. Therefore, if the focus is on a distant main object, the distance correction between the optical axes of the lenses is insufficient for the object in the close range in the same pictures. Accordingly, when using a three-dimensional slide viewer (viewer), objects of close distance are projected unnaturally from the photograph. In order to correct this, the outside areas of the left and right photographs should be covered properly.

On the other hand, in the case of a stereo camera that can adjust the distance between the optical axes irrespective of the focusing adjustment, the user can obtain a picture by optimizing the parallax while observing the image of the finder, but in this case, the distance adjustment and focusing between the optical axes is in this case. Adjustments must be made separately. In this case, there is no obstacle in playing a still scene, but deterioration of image quality occurs when taking a picture quickly, and therefore it is not used for instant shots.

As described above, a stereo camera having a mechanism for adjusting the distance between optical axes has an advantage, but also has a disadvantage depending on the object to be photographed. However, carrying two types of stereo cameras is inconvenient and expensive.

Therefore, it provides a mechanism for automatically saving the distance between the optical axes to increase the convenience and at the same time the distance between the optical axes to be suitable for both the case where rapid shooting is required and when complete parallax correction by one stereo camera is required. There is a technical problem to be solved to allow adjustments to be made manually.

In order to achieve the above object, the present invention provides a camera body having a structure in which two optical systems of monocular reflective camera bodies are integrated, a pair of photographing lenses, and a pair for mounting the photographing lenses in parallel in the optical axis direction thereof. A reflection type stereo camera comprising a focus adjusting mechanism for adjusting focus by interlocking a lens plate of the lens plate, and a mechanism for adjusting a distance between the optical axes to adjust a distance between the lens plates. Lens shift cams are installed on the base frame supporting the adjustment mechanisms symmetrically with their cam surfaces facing each other, the lens plates are provided with engaging portions in contact with the lens shift cams, and the coupling portions are provided with the lens shift cams. Press the lens plates in a direction of increasing the spacing by a spring so as to make a pressure contact on the A mechanism for automatically adjusting the distance between the optical axes so that the field of view of the left and right photographing lenses is always matched by the lens shift cams irrespective of the feed amounts of the photographing lenses, and by means such as a conveying screw or the like. And a mechanism for manually adjusting the distance between the optical axes by providing an extension contraction mechanism for switching the distance between the pair of lens shifters and arranging the lens plates between the pair of lens shifters. Type stereo camera.

The present invention also has a binocular finder portion having a pair of left and right pentagonal prisms mounted on the left and right focus plates of the stereo camera and the inner quadrilateral portions of the left and right focus plates symmetrically. A monocular finder unit having a synthesizing prism for inverting and synthesizing one upright image is provided so as to be interchangeable with each other.

1 is a perspective view of a main body and a lens unit of a stereo camera according to the present invention.

2 is a perspective view of the lens unit.

3 is a diagram showing a relationship between the distance between optical axes and the focus of a photographing lens when correcting parallax.

4 shows a stereo camera equipped with a binocular finder.

5 is a diagram showing the binocular disparity of the focus plate by the binocular finder unit,

5A is a diagram showing a case where the distance between the optical axes is appropriate.

5B is a diagram showing a case where the distance between optical axes is not suitable.

6 shows a phase shift as the distance between optical axes is adjusted.

FIG. 7 shows a stereo camera equipped with a single-lens finder unit. FIG.

8 is a perspective view showing a synthetic prism.

9 shows the relationship between the size of the composite prism and the pitch of focus plates.

10 is a perspective view showing another embodiment of the synthetic prism.

11A shows an object.

11B, 11C, and 11D respectively show finder images of an object according to the monocular finder portion.

12 is a circuit diagram of an alarm display circuit.

* Explanation of symbols for main parts of the drawings

1: Stereo Camera 2: Camera Body

3: lens part 4R, 4L: shooting lens

5R, 5L: Reflective mirror 6R, 6L: Focus plate

7: Base frame 8: Slide frame

9R, 9L: Lens Plate 13: Lens Shifter

14 Lens shift knob 15 Compression coil spring

5R, 5L: Lens shaft cam 19: Micro switch

Hereinafter, embodiments of the present invention will be described in detail. 1 shows a camera body 2 of a stereo camera 1 and a detachable lens 3. The camera body 1 has a structure in which optical system mechanisms of two optical systems of a single lens type camera are integrally provided in parallel. In the lens unit 3, 45 ° reflecting mirrors 5R and 5L are disposed on the right and left sides to reflect the light rays incident through the photo lenses 4R and 4L to the upper side, and are rotated in the vertical direction. A focal plane shutter (not shown) is disposed behind the reflective mirrors 5R and 5L. Focus plates 6R and 6L are disposed on the reflecting mirrors 5R and 5L, and finder portions to be described later are mounted on the focus plates 6R and 6L.

As shown in FIG. 2, a box-shaped slide frame 8 is assembled to the base frame 7 of the lens unit 3 so as to slide forward and backward, and in front of the slide frame 8. Right and left lens plates 9R and 9L are attached. When the focus knob 10 mounted on the base frame 7 is rotated, the slide frame 8 is photographed by a known transport mechanism (not shown) such as a cam or a rack-and-pinion mechanism (not shown). It moves in the front and rear directions parallel to the optical axis of 5L). The slide frame 8 guides movement by engaging with a guide formed on the base frame 7 or by mounting a guide rail on the base frame 7 and mounting a bush on the slide frame 8 to engage with the guide rail bush. It is supposed to be done. The rear vertical surface of the base frame 7 and the slide frame 8 are coupled to each other by a slide expansion tube structure or bellows formed so that external light does not enter the inner space of the slide frame 8.

The slide frame 8 and the lens plates 9R, 9L are coupled to each other by a dovetail guide mechanism 11, and the lens plates 9R, 9L are slidably in a direction perpendicular to the optical axis. It is. The lens shift shaft 12 is mounted on the upper surface of the slide frame 8 in a direction perpendicular to the optical axis. The right hand screw and the left hand screw are symmetrically formed on both sides of the center of the lens shift shaft 12. The lens shift shafts 12 are coupled to the lens shift shafts 13 having inner spirals which are screwed to the right and left hand screws thereof. When the lens shift knob 14 of the lens shift shaft 12 is rotated, the lens shifts 3 are symmetrically approached or separated from each other according to the rotation direction thereof.

Compression coil springs 15 are arranged on the right and left lens plates 9R and 9L to press the lens plates 9R and 9L in the extending direction, and the lens plates R and 9L. The arm 16 is provided to face the inner side of the lens shift 13 on the upper surface of the ().

In front of the base frame 7, the plate-shaped lens shift cams 17R, 17L are symmetrically mounted to press the rollers 18 positioned below the lens plates 9R, 9L, and thus the rollers ( 18 are in pressure contact with the lens shift cams 17R and 17L in accordance with the operation of the lens shift knob 14. That is, when the lens shift knob 14 is rotated in the direction in which the lens plates 9R and 9L are spaced apart from each other, the lens plates 9R and 9L are moved outward by the compression coil spring 15. As a result, the rollers 18 press the lens shift cams 17R and 17L, and the lens shifts 13 move outward to separate from the arms of the lens plates 9R and 9L. .

When the lens shift knob 14 rotates in the opposite direction, the lens shift 13 pushes the arm 16 from the outside to move the lens plates 9R and 9L in a direction approaching each other, and the roller 14 Are spaced apart from the lens shift cams 17R and 17L.

The lens shift cams 17R and 17L can match the shooting range of the right and left photo lenses 4R and 4L at a predetermined focal length regardless of the feeding amount of the photo lenses 4R and 4L. It is configured to be. 3 shows the relationship between the distance between the optical axes and the focus of the photographic lenses. If a thin lens piece is used, the focal length of the lens is f, the distance from the object to the origin of the lens is L, and the distance from the focal point of the lens to the image forming position is if, if = f ² / The equation Lf holds, and accordingly, the distance between the lens origin and the film plane is f + if.

Further, assuming that the pitch between the left and right exposure surfaces of the stereo camera is P ₁ , the shift amount S1 of the left and right lenses for matching the left and right photographing ranges is given as follows.

That is, the left and right lenses will move in a direction approaching each other by the movement amount S1 calculated from the above equation as the distance from the object to the origin of the lens decreases.

The lens shift cams 17R and 17L shown in FIG. 2 have a structure based on the above equation, and the photo lenses 4R and 4L are positioned at infinite focal positions by the focus knob 10. The lens shift knob 14 rotates in the direction in which the lens plates 9R and 9L are spaced apart from each other. When the rollers 18 press the lens shift cams 17R and 17L to separate the lens shifters 13 from the arms 16, the rollers 18 can automatically store the distance between the optical axes. It is in a state.

In this state, the optical axis intervals of the photographing lenses 4R and 4L are changed along the cam surfaces of the lens shift pit cams 17R and 17L which are linked to the focusing adjustment by the focus knob 10, and accordingly. The photographing ranges of the right and left photographing lenses 4R and 4L of the focal length are always coincident with each other. The pitch of the right and left exposure photographs and the pitch of the maximum optical axes of the photographing lenses 4R and 4L are preferably about 63.5 mm corresponding to the distance between both eyes of the user. The camera body 2 can be replaced with any lens unit by designing the shape of the lens shift cams 17R and 17L so as to match the focal length of the photographing lens to form a lens unit having various focal lengths.

In the case of adjusting the deviation of the left and right half phases of the finder to adjust the focal length by attaching a single-lens type, ie, monocular finder, which will be described later, the distance between the optical axes is automatically adjusted. It is necessary to adjust the focus. However, when the distance between the optical axes is manually adjusted, an alarm is generated when the arms 16 are pushed by the lens shifters 13 to separate the rollers 18 from the lens shift cams 17R and 17L. It is necessary to indicate. To this end, the microswitch 19 is mounted outside the moving range of the one arm 16 on the upper surface of the slide frame 8. When the lens shifter 13 is moved to an outer position that does not contact the arm 16 even at the infinite focus position, the lens shifter 13 pushes the pushbutton of the microswitch 19, thereby reducing the distance between the optical axes. It is possible to detect a condition for automatic adjustment.

The electrodes of the microswitch 19 are connected via contacts 20 to contacts (not shown) on the back of the base frame 7. As shown in FIG. 1, a contact portion 21 corresponding to the contact point of the lens portion 3 is provided at the center portion of the front surface of the camera body 2. When the lens unit 3 is attached to the camera body 2, the microswitch 19 is connected to the controller of the camera body 2. A photometric contact point 22 is connected to the photometric element of the finder unit, and near the inner edges of the focus plates 6R and 6L of the camera body 2, a finder unit detection contact point for identifying the type of finder unit to be described later ( 23) and a light emitting element 234 for displaying an alarm is provided.

Referring to FIG. 4, there is shown a stereo camera 1 equipped with a binocular finder part 31, which is one of two types of finder parts. The binocular finder portion 31 includes pentagonal prisms 33R and 33L corresponding to the focus plates 6R and 6L of the camera body 2 assembled to the cover 32. The photometric element 34 is assembled to one side pentagonal prism 33. The contact 35 of the light metering element 34 is in contact with the light metering contact 22 of the camera body 2. The controller is configured to adjust the shutter speed or the auto iris of the photographing lens or all of them so as to impart an appropriate exposure amount to the photographic film so as to constitute a known automatic exposure mechanism.

The binocular finder portion 31 is not provided with a contact corresponding to the finder portion detection contact 23 of the camera body 2. When the binocular finder portion 31 is mounted, the finder portion detecting contact 23 is in an open state.

Light rays incident on the photographing lenses 4R and 4L form an image on the focus plates 6R and 6L through the reflection mirrors 5R and 5L, and the pentagonal prism 33R and 33L. The upright image inverted from the left and right inverted images on the focusing plates 6R and 6L can be observed through the right and left eyepieces. In FIG. 1, the focusing plates 6R and 6L are indicated by a collimation mark MR, ML having three vertical lines at the center and right and left and a circular pattern of the center position. When the focal points of the photographing lenses 4R and 4L are set to infinity, the photographing lenses 4R and 4L move to the outer axis as described above to separate the lens shifters 13 from the arm 16. The distance between the optical axes is automatically adjusted to infinity, and the right and left viewfinder images can be seen by both eyes, and the collimation display (MR) of the right and left focus plates (6R) and (6L) ), MLs are observed to coincide with each other as shown in FIG. 5A.

When the focus knob 10 is rotated to transfer the photographing lenses 4R and 4L, the photographing lenses 4R and 4L are approached to each other along the lens shift cams 17R and 17L. As a result, the left and right shooting ranges are automatically matched regardless of the shooting distance. Therefore, the parallaxes of the photographing lenses 4R and 4L with respect to the object are automatically corrected regardless of the photographing distance, so that the object at the focal point is photographed at the same position on the left and right pictures. As described above, when the film is mounted on the three-dimensional slide mounting port, it is almost impossible to correct the parallax by adjusting the film pitch. Since the non-overlapping portions of the left and right pictures to be shielded by the windows of the slide fitting are reduced, it is possible to construct a three-dimensional slide with low picture loss.

However, if the objects are at different distances in the pictures, the relative positions between the object in the near field range and the collimation marks (MR) and (ML) are right and left when the focus is on the far-away object. 5b according to the user's collimation that the right and left collimation marks (MR) and (ML) do not coincide with each other and are noticed in an object in the near field range as a result of being different from the focus plates 6R and 6L. As shown in FIG. In this case, when the lens shift knob 14 is rotated as shown in FIG. 6 to reduce the distance between the optical axes of the photographing lenses 4R and 4L, the objects 1R and 1L are in the near field range. ) Are moved in the direction approaching each other in the right and left focus plate (6R), (6L), the objects (1R), (1L) in the near field range by the pentagonal prism (33R), (33L) The left and right inverted upright viewfinder images are moved opposite to each other in a direction spaced from the focus plates. The parallaxes of the collimation marks MR and ML of the focus plates 6R and 6L are corrected as shown in FIG. 5A to reach a point where the collimation marks MR and ML match. The fields of view of the photographing lenses 4R and 4L generally coincide in the distance between objects in the near field of view.

In the case of manually adjusting the distance between the optical axes, the relative front and rear positions of the object relative to the collimation mark (MR) and (ML) are indicated by the collimation marks (MR) and (ML) of the focus plates 6R and 6L. ) Changes in response to the shift amount within the lens shift range where they coincide with each other. Within the lens shift range where the collimation display (MR) and (ML) coincide with each other, an excellent stereoscopic effect is obtained regardless of the shift amount, but a specific effect is required to deviate the object within the near field range from the photograph to the above state. In this case, the above effects are not obtained. If the whole object is observed from a distance from the collimation display (MR) and (ML) where the above adjustments coincide with each other, the three-dimensional image of the near field range is focused at a close distance when recognized by the three-dimensional slide viewer. It is not caught, and instead, a solid slide having a natural solid effect is obtained.

When the three-dimensional side photographed as described above is mounted on the three-dimensional slide mounting hole, the parallax is corrected in an optimal state with respect to the object in the left and right pictures, and thus it is not necessary to shield the non-overlapping parts, It is possible to use a three-dimensional slide fitting having a window of substantially the same size as the photo size of the, resulting in no loss of the picture.

If the slides are mounted in the solid slide fitting, the stereoscopic effect confirmed by the finder at the time of shooting if the slides are mounted in a reference position where the right and left centers of the window of the solid slide mounting do not coincide with the right and left centers of the slides. In this case, it is not necessary to adjust the mounting position of the slide in response to the shooting distance of the object.

7 shows a stereo camera 1 equipped with a monocular finder portion 41. The synthesizing prism 43 assembled to the cover 42 synthesizes one upright image by symmetrically inverting the outer half of the photograph half within the photographing range of the right and left lenses of the stereo camera proposed by the inventor of the present invention. Prism to make.

The monocular finder portion 41 has a photometric element 4 on the side of the synthetic prism 43, the contact 45 of the photometric element 43 is in contact with the contact 22 of the camera body (2) have. A contact 46 is also provided in contact with the finder portion detecting contact 23 of the camera body 2.

The synthetic prism 43 is made of photo resin or optical fiber, and is composed of two total reflection prisms formed symmetrically as a single structure. As shown in FIG. 8, two 180-degree reflective prism portions 47R and 47L coupled in parallel have one side half outside the incidence plane and a 90-degree reflective prism portion for receiving light from the bottom ( 48R) and (48L) are combined. The inner halves of the 180 degree reflective prism portions 47R and 47L constitute the continuous projection plate 49.

As shown in FIG. 9, the pitch P ₂ between the vertices of the 180 degree reflectors 47R and 47L is equal to 1/2 of the pitch P ₁ between the centers of the left and right exposure photographs. Correspondingly, the full width W is slightly wider than the pitch P ₁ of the photos.

As shown in FIG. 8, the composite prism 43 has the incidence planes of the right and left 90 degree total reflection prism portions 48R, 48L on the inner half regions of the focus plates 6R, 6L. It is configured to be disposed on the facing right and left focus plates, so that the light rays incident on the 90 degree reflective prism portions 48R, 48L from the bottom are totally reflected three times from the projection plate 49. It comes out in the horizontal direction.

The images reversed up, down, left, and right through the lenses 4R, 4L are inverted up and down by the reflection mirrors 5R, 5L, and are upright images inverted left and right by the focus plates 6R, 6L. Are formed. The images of the inner halves of the right and left focus plates 6R and 6L are inverted symmetrically from side to side. That is, the outer halves of the photographing range of the right and left lenses 4R and 4L are inverted left and right in symmetry by the prism 11. Therefore, the upright image of the outer half in the photographing range of the left lens 4L is projected on the left half of the projection surface 49 of the prism 43, and the upright image of the outer half of the photographing range of the right lens 4R is the projection surface 49 Is projected onto the right half of the photon), and a picture is synthesized. The focus plates 6R, 6L need not have the same size as the photograph, but may have a size that is equal to or slightly larger than the incident surface of the prism having a size that is approximately one half of the photograph size.

FIG. 10 shows another embodiment of the synthetic prism of the monocular finder portion, which is different from the prism 43 shown in FIG. 7 of the synthetic prism. The left and right halves of the central 90 degree reflective prism portion 52 are shown in FIG. And inner half portions of the projection planes of the 180 degree reflective prism portions 53R and 53L which are coupled to them. Similar to the prism 43 shown in FIG. 7, the light beam is totally reflected three times in this prism as well. The pitches and the full widths of the vertices of the 180 degree reflective prism portions 53R and 53L are all the same as the prism 43.

When the monocular finder portion 41 as described above is mounted, the lens portion 3 is set in a state of automatically adjusting the distance between the optical axes, and thus the images of the focus plates 6R and 6L are set. The focus adjustment state can be determined by the deviation in the finder of the side half except for the case where the focus adjustment state is visually recognized, and the focus adjustment can be easily performed even in a dark shooting environment.

Referring to FIG. 11A, an object is shown, and view images of the monocular finder portion 41 are shown in FIGS. 11B, 11C, and 11D. When the stereo camera is rotated in the horizontal direction to place the object shown in FIG. 11a in the center of the picture. If the object is focused, the object positioned at the intersection of the left and right views is the same as that shown in FIG. 11b. It looks like a form.

If an object is positioned far away from the focal position, that is, far from the intersection of the left and right lens fields, the object will appear as shown in FIG. 11C, and if the object is placed further away, the object will be Observed dual phases spaced to the left and to the right. On the other hand, when the object is located in a range close to the intersection of the left and right lens field of view, the portion located at the center dead center is hidden so that it appears to have a narrow width as shown in FIG. In this way, the focus knob 10 is rotated so that an object other than the finder picture can be seen as a substance, and thus the picture is focused.

Moreover, depending on the object, parallax may not be easily corrected and focus may not be easily adjusted. It can be difficult to determine focusing and parallax, especially if the object is a vertical or horizontal line. In this case, the stereo camera should be tilted right or left from the horizontal state to easily ensure that the focus is adjusted.

When the right and left lenses 4R and 4L of the stereo camera 1 are focused to infinity, the optical axes are positioned at the center of the right and left exposure photographs. When the monocular finder portion 41 is mounted, the viewfinder image synthesized by the outer half of the field of view of the right and left lenses 4R and 4L is visible, and thus the pitch of the optical axes of the lenses 4R and 4L. The central area toward the centers of the right and left photographing ranges by the same width as is outside the field of view. However, the invisible range is a very narrow linear section, with very few objects to be hidden within this range. When the stereo camera is deflected in the horizontal direction, the entire object within all the shooting ranges is visible, so there is no inconvenience when taking a picture.

When the monocular finder portion 41 is mounted so that the distance between the optical axes can be automatically stored, the parallax is corrected in conjunction with the focus adjustment, and thus the non-overlapping portion is left on the left and right pictures. Almost never exist. However, if the object is focused at a distant distance and shooting is performed with insufficient parallax correction for an object in the near field of view, the parallax is corrected by moving the outer parts of the left and right photographic films when mounted similarly to the conventional method. Needs to be. However, the area of the non-overlapping portions of the left and right pictures is remarkably reduced in comparison with a general stereo camera which is not equipped with a mechanism for adjusting the distance between the optical axes, thereby obtaining a stereoscopic slide having very low picture loss.

When the monocular finder part 41 which adjusts the focus by the deviation of the lateral upper half of the finder picture is mounted, if the distance between the optical axes of the photographing lenses 4R and 4L is corrected manually, Even if the same focal position is obtained by the parallax change of the right pictures, the deviation of one side upper half of the lateral side is changed, and it is impossible to adjust the focus on this phase deviation, and as a result, the distance between the optical axes is set automatically. It is necessary. Therefore, if it is wrong to adjust the distance between optical axes manually when the monocular finder part 41 is mounted, it is necessary to display an alarm by appropriate means.

12 shows an embodiment of an alarm display circuit. When the monocular finder unit 41 is mounted on the camera body 2, the contact 46 of the monocular finder unit 41 comes into contact with the finder unit detection contact 23 of the camera body 2. The micro switch 19 of the lens unit 3 is normally in a closed state, and the transistor Q1 for driving the light emitting diode 24 of the light emitting element is disposed between the optical axes when the monocular finder unit 41 is mounted. In the state of manually adjusting the distance, that is, in the ON state in which the microswitch 19 is not pressed, it is connected to the negative power supply through the main body ground wire. Accordingly, the alarm display circuit is operated so that the free-operating multivibrator 25 starts to operate, and the transistor Q1 operates so that the light emitting diodes 24 emit light for a predetermined time interval. This warns the user of the manually operated distance between the optical axes.

On the other hand, as shown in FIG. 4, since the binocular finder portion 31 is not provided with a contact corresponding to the finder portion detection contact point 23, the light emitting diode 24 is mounted with the binocular finder portion 31. As shown in FIG. It does not emit light regardless of the state of adjusting the distance between the optical axes, and in this case, the automatic state and the manual state are arbitrarily switched for shooting. Of course, the light emitting diodes 24 do not emit light when the finder parts 31 and 41 are not mounted to the camera body 2.

It is to be noted that the present invention is not limited to the above-described embodiments and can be modified in various ways within the technical scope of the present invention, and such modified embodiments are also within the scope of the present invention.

According to the stereo camera of the present invention as described above, a mechanism for automatically adjusting the distance between the optical axes of the lenses to which the focusing is fixed is provided, and the manual adjustment of the distance between the optical axes is also performed. Therefore, when using a mechanism that automatically adjusts the distance between the optical axes, the shooting ranges of the left and right lenses at the focal length are matched only by the focusing adjustment, and the left and right parallaxes of the object at the focal length are appropriate. In this way, the non-overlapping portions of the left and right photographs, that is, the photographing is made in a state in which the photo loss of the stereoscopic image is suppressed.

In the case where a distant object and an object in a close range coexist, manual adjustment of the distance between the optical axes is performed, and an optimal calibration state is achieved while obtaining the effect of parallax correction by adjusting the distance between the optical axes by the binocular finder unit. You can make a shot with Therefore, the above-described functions are used according to the state, and as a result, high-quality stereoscopic photographs are easily obtained, thus greatly contributing to the spread of stereoscopic photographs.

Claims (2)

Focusing is achieved by interlocking a camera body having a structure in which two optical systems of monocular reflection camera bodies are integrated, a pair of lens lenses, and a pair of lens plates for mounting the lens lenses parallel to the optical axis direction thereof. A reflective stereo camera having a focusing mechanism and a mechanism for adjusting a distance between the optical axes to adjust a distance between the lens plates, wherein the lens shifts to a base frame supporting the lens plates and the focusing mechanisms. The cams are provided such that their cam faces are symmetrically opposed to each other, the lens plates are provided with engaging portions in contact with the lens shift cams, and the lens plates are pressed in contact with the lens shift cams. Presses the lens in a direction of increasing intervals by a spring to view the fields of view of the left and right photographing lenses. A mechanism for automatically adjusting the distance between the optical axes so that the cams always coincide with each other regardless of the feeding amounts of the photographing lenses, and an extension for switching the distance between the pair of lens shifters by means such as a feeding screw. And a mechanism for providing a contracting mechanism and manually adjusting the distance between optical axes by arranging the lens plates between the pair of lens sheets. The binocular finder portion having a pair of left and right pentagonal prisms mounted on the left and right focus plates of the stereo camera, and the inner photo halves of the left and right focus plates are symmetrically. A reflective stereo camera, wherein the monocular finder portions having a synthetic prism for synthesizing one upright image by inverting left and right are configured to be interchangeable with each other.