JP3984679B2 - Light receiving element position adjustment device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a position adjusting device for a light receiving element used in a small-sized device such as a camera focus detection device.
[0002]
[Prior art]
In recent years, many single-lens reflex cameras are equipped with an autofocus device based on a phase difference detection method using a line sensor, and the focus detection point, which was the central point on the shooting screen at the beginning of the appearance, is also 3 in the horizontal direction. Increasing in the vertical direction, 5 points. However, these are all focus detections for a very narrow point-like range, and the photographer cannot perform focus detection at a free position.
[0003]
In recent years, many proposals have been made on so-called area-type autofocus (hereinafter referred to as “area AF”) in which focus detection is possible at a free position within a two-dimensionally provided focus detection range.
An outline of a camera having a focus detection optical system for realizing the area AF will be described with reference to FIG.
That is, on the optical axis O of the lens mount 1 to which an objective lens (not shown) is attached, a main mirror 2 having a semi-transmissive region at the center is disposed so as to be rotatable, and on the rear surface side of the main mirror 2. The first sub-mirror 3 disposed obliquely on the optical axis O is attached, and the second sub-mirror 6 is provided on the bottom of the camera so as to face the first sub-mirror 3. Reflected through the semi-transmissive region of the mirror 2 via the first sub-mirror 3 and the second sub-mirror 6, and corresponding to the infrared cut filter 8, the aperture 9 having four apertures, and the aperture of the aperture 9 A re-imaging lens block 10 having four lens portions and a third sub-mirror 11 are arranged to receive light by an area sensor 13 which is composed of a light receiving element and has two pairs of two-dimensional light receiving areas perpendicular to each other, and performs focus detection. Going on.
[0004]
In general, in the area AF using the phase difference detection method, the secondary object image projected as a pair has a large two-dimensional spread, so that the size of the sensor increases.
Therefore, by adopting the Z-type optical system as described above, the optical path length from the imaging surface 5 to the area sensor 13 is increased, and among these, the distance between the re-imaging lens block 10 and the area sensor 13 is shortened as much as possible. By doing so, the re-imaging magnification to the area sensor 13 is made as small as possible.
[0005]
[Problems to be solved by the invention]
By the way, in the above-described focus detection configuration, each of the two pairs of light receiving areas arranged orthogonal to each other is positioned on a plane perpendicular to the optical axis and arranged in parallel to each pupil division direction. Is an indispensable condition for detecting an accurate focus state.
However, since an error always occurs between the optical axis and each light receiving surface of the area sensor 13 due to single component accuracy, assembly error, etc., a mechanism for positioning the area sensor 13 with respect to the optical axis is required. .
Further, in the above-described conventional example, it is necessary to adjust the inclination about two orthogonal axes perpendicular to the optical axis because of the two pairs of light receiving areas. In such an adjustment mechanism, there is a method in which the light receiving element is held on the first stage that adjusts the tilt of one axis and the second stage that is overlapped with the first stage that adjusts the tilt around the other orthogonal axis. It is common. However, in the area AF where it is desirable to make the distance between the re-imaging lens block 10 and the area sensor 13 as short as possible, the adjustment method is difficult due to space limitations.
[0006]
In addition, a method not using two adjustment stages is described in Japanese Patent Publication No. 63-88512, but this method is not used for the following reason.
First, because the area sensor is composed of finer pixels than the conventional line sensor for miniaturization, a slight deviation when tightening the screw after adjustment may affect the focus detection. .
Secondly, in the adjustment method using the flexibility of the sensor holder, the sensor holder itself may be deformed due to a change with time or the like and the adjustment may be out of order.
[0007]
In the present invention, in view of the problems of the conventional example described above, the position adjusting device for the light receiving element of the sensor for focus detection can be configured with a small space, and the adjusted sensor can be fixed easily and reliably. An object of the present invention is to provide a position adjusting device for a light receiving element.
[0008]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention relates to a position adjusting device for a light receiving element in which the light receiving element on which an object image is projected by an imaging lens requires tilt adjustment around two axes orthogonal to each other. The holding member is rotatable around one axis and is movable in the optical axis direction of the imaging lens.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention described in claim 1 includes an imaging lens, a light receiving element on which an object image is projected by the imaging lens, and a sensor holding member that holds the light receiving element. In a light receiving element position adjusting device that requires tilt adjustment about two first and second axes perpendicular to the optical axis and perpendicular to each other, the sensor holding member is parallel to the first axis. By being rotatably attached to a pair of hinge portions arranged side by side, the light receiving element can be adjusted in inclination around the first axis, and when at least one of the hinge portions moves back and forth in the optical axis direction, the light receiving element is Since the tilt adjustment around the second axis is made possible, only the sensor holding member exists between the imaging lens and the light receiving element, so that the light receiving element can be arranged in a very small space. Fixed around the axis at the same time Since it is, a simple configuration.
[0010]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
1 is a sectional view of a mirror box portion of a camera having a focus detection optical system for realizing area AF, FIG. 2 is an exploded perspective view of an AF block portion of the focus detection optical system, and FIG. 3 is a focus detection optical system. It is a top view which shows the structure of the 1st submirror of them.
In the figure, reference numeral 1 denotes a lens mount, and an objective lens (not shown) is attached to the front part thereof. Reference numeral 2 denotes a main mirror which is disposed on the optical axis O of the objective lens and has a semi-transmissive region at the center, and is held by the main mirror receiving plate 22. 3 is a first submirror disposed obliquely on the rear surface of the main mirror 2 on the optical axis O, 4 is an imaging plane, and 5 is a paraxial imaging plane conjugate with the imaging plane 4 by the first submirror 3. , 6 are second sub-mirrors which are arranged on the bottom side of the camera so as to face the first sub-mirror 3 and are attached to the mask member 7 in order to prevent reflection of unnecessary rays. Reference numeral 21 denotes a finder frame.
[0011]
8 is an infrared cut filter, 9 is a stop having four openings described later, 10 is a re-imaging lens block having four lens portions corresponding to the openings of the stop 9, 11 is a third sub mirror, Reference numeral 13 denotes an area sensor having a two-dimensional light receiving area composed of a light receiving element held by the sensor holding member 12, and is supported by an AF main body block 24 described later.
[0012]
Here, as shown in FIG. 3, the first sub-mirror 3 is composed of a substantially oval reflecting portion 3a which is a spheroidal surface and a flange portion 3b for fixing to the sub-mirror receiving plate 23. The reflecting portion 3a A mask 15 serving as an opening is attached. Thus, the first sub-mirror 3 also serves as a field mask that limits the focus detection area. The two focal points defining the ellipse of the reflecting portion 3a are on a line obtained by extending the optical path after the light beam on the optical axis O of the objective lens is refracted by the main mirror 2 to the objective lens side. The optical paths after being reflected by the first sub-mirror 3 are positioned on the extended lines. The second and third submirrors 6 and 11 are both plane mirrors.
[0013]
The diaphragm 9 is made of a light shielding thin plate made of metal or resin, and has four openings 9e, 9f, 9g, 9h, and the openings 9f, 9h are arranged orthogonal to the openings 9e, 9g. Has been.
The re-imaging lens block 10 has a single concave spherical surface 10a centered on the optical axis O of the objective lens deflected by the first sub-mirror 3 on the light incident side, and a convex lens decentered in the opposite direction on the emission side. 10e, 10f, 10g, and 10h (the pair of convex lenses 10e and 10g and the pair of convex lenses 10f and 10h are orthogonal to each other). Further, the center of the concave spherical surface 10a is on the paraxial image plane 5 of the objective lens formed by the first submirror 3, and the centers of the two pairs of convex lenses 10e, 10f, 10g, and 10h are the diaphragm. 9 is set almost equal to the vicinity of the opening.
The area sensor 13 includes two-dimensional light receiving areas 13e, 13f, 13g, and 13h, and a pair of the light receiving areas 13e and 13g and a pair of the light receiving areas 13f and 13h are orthogonal to each other.
[0014]
The diaphragm 9 and the re-imaging lens block 10 are coaxially mounted on the shafts 24i and 24j of the AF main body block 24 using the positioning holes 9i, 9j and 10i and 10j, respectively, and the mutual positional accuracy is guaranteed. The AF body block 24 is fixed in a state.
Further, the AF main body block 24 is provided with holes 24a on both sides, and the adjusters 14 are attached to the holes 24a so as to be slidable in the vertical direction, and projecting integrally with the adjusters 14. Arc-shaped sliding portions 12a provided on both sides of the sensor holding member 12 made of a metal plate are in contact with the hinge portion 14a. The surface of the cover glass 13 a affixed to the light receiving surface side of the area sensor 13 is in contact with the lower surface of the sensor holding member 12.
Each light receiving area 13e, 13g and 13f, 13h of the area sensor 13 is composed of a plurality of sensor rows 101 and 102 each composed of a number of pixels each having a rectangular opening as shown in FIG. The sensor trains are paired.
[0015]
Here, as an optical path for focus detection, the light beams that have passed through the apertures 9e, 9f, 9g, and 9h of the diaphragm 9 are respectively connected to the third sub-mirror by the convex lenses 10e, 10f, 10g, and 10h of the re-imaging lens block 10. 11, secondary object images are formed in the light receiving areas 13e, 13f, 13g, and 13h of the area sensor 13, respectively. Note that the light flux that has passed through the elements with different subscripts does not reach a predetermined position on the area sensor 13 and therefore does not contribute to focus detection. The detection system using the light beam passing through the elements indicated by the subscripts e and g separates the exit pupil of the objective lens in the vertical direction, while using the light beam passing through the elements indicated by the subscripts f and h. Separates the exit pupil of the objective lens laterally.
Hereinafter, a detection system that separates the pupil in the vertical direction is referred to as a “first focus detection system”, and a detection system that separates the pupil in the horizontal direction is referred to as a “second focus detection system”.
[0016]
Accordingly, the focus detection light beam will be described. First, a light beam from an objective lens (not shown) is transmitted through the main mirror 2 and then reflected by the first sub mirror 3 in a direction substantially along the inclination of the main mirror 2. The first sub-mirror 3 is an elliptical mirror as described above, and can substantially project the vicinity of two focal points. Here, one focal point is set to the optical equivalent point of the representative exit pupil position of the objective lens, and the other focal point is set to the optical equivalent point of the stop 9 to provide a function as a field lens. The representative exit pupil position of the objective lens is a hypothetical pupil position unique to the focus detection system that is comprehensively determined in consideration of the exit window conditions of various photographing lenses mounted on the camera.
[0017]
Further, the light beam reflected by the first sub-mirror 3 is reflected again by the second sub-mirror 6 and enters the infrared cut filter 8. Here, infrared rays that cause a decrease in focus detection accuracy are removed, and only light in a wavelength region in which the aberration correction of the objective lens is sufficiently reached the diaphragm 9 and the re-imaging lens block 10 placed behind. To do. The light beam converged by the action of the re-imaging lens block 10 forms a secondary object image on the area sensor 13 via the third sub-mirror 11.
[0018]
FIG. 7 shows a focus detection area on the imaging surface 4 of the focus detection apparatus according to the present embodiment. 111 indicates a range in the first focus detection system, and 112 indicates a range in the second focus detection system. . The secondary object image on the area sensor 13 corresponding to the focus detection area formed by the convex lenses 10e, 10g and 10f, 10h of the re-imaging lens block 10 is: FIG. 103e, 103g and 104f, 104h shown in a lattice form, which are pairs of images whose relative positional relationship should be detected.
[0019]
Here, unlike the interval between the apertures 9e and 9g of the diaphragm 9 and the interval between the apertures 9f and 9h, the second focus detection system having a larger interval is more sensitive to the movement of the secondary object image. Focus detection is possible.
In addition, in the first focus detection system with a narrow interval, focus detection is possible in an area determined by the size of the first sub-mirror 3, but in the second focus detection system with a large interval, the opening of the main mirror 2 and Since the region through which the light beam can pass is limited to the opening of the mask member 7 on the second sub mirror 6 and the size of the representative pupil, the focus detection range is different.
[0020]
Furthermore, due to the first sub-mirror 3 being curved and inclined, each image has a considerably large distortion having no symmetry with respect to the optical axis as shown in FIG. However, even if such distortion exists, there is no problem as a focus detection device for a camera that requires particularly quick focusing if the following two conditions are satisfied.
First, in order to obtain an accurate in-focus determination, the conditions correspond to the same position on the object on the pair of sensor rows to be detected at least when the objective lens is in focus. The secondary object image is projected, that is, the magnification difference between the two images is small in the direction orthogonal to the sensor array. Second, in order to obtain accurate defocus detection, when the defocus of the objective lens occurs, a secondary object image corresponding to the same position on the object is positioned on the pair of sensor rows to be detected. It is projected with a certain phase difference.
[0021]
Therefore, this focus detection system will be described from this point of view. For the first focus detection system that separates the pupil in the vertical direction, the paper surface of FIG. 1 in which the inclination of the first submirror 3 coincides with the pupil separation direction. Therefore, the distortion of each of the secondary object images 103e and 103g has a fan shape symmetrical to the paper surface.
However, if attention is paid to the difference in distortion between the two images, it is slight, and there is almost no difference in image magnification between the secondary object images 103e and 103g in the horizontal direction in the figure corresponding to the direction orthogonal to the pupil separation. . Therefore, FIG. If it is placed on the sensor array in the light receiving area as shown in Fig. 1, it is projected on any sensor array on one light receiving area. Object image paired with object image Is projected onto the corresponding sensor array on the other light receiving sensor. That is, the first condition is satisfied.
[0022]
Further, the distortion of the secondary object image is caused by the first sub-mirror 3, that is, the pupil projection optical system, and the distortion generated on the paraxial image plane 5 of the first sub-mirror 3 is directly applied by the re-imaging lens block 10. It can be said that it is projected on the area sensor 13. Therefore, the moving direction of the secondary object image is the direction in which the openings 9e and 9g of the diaphragm 9 are arranged, and the arrow D shown in FIG. ₁ Direction. Therefore, by setting the sensor array as shown in FIG. 6 as described above, the second condition is also satisfied at the same time, and with this, the relative positional relationship of the secondary object images is compared to determine the defocus amount of the objective lens. be able to.
[0023]
Next, for the second focus detection system that separates the pupil in the horizontal direction, the difference in image magnification between the two images becomes smaller in the direction orthogonal to the separation of the pupil, this time near the center of the imaging surface. It is only an area.
Therefore, if the light receiving area is limited to only this portion, the object image projected on an arbitrary sensor row on one light receiving area is projected on the corresponding sensor row on the other light receiving area. Thus, the first condition is satisfied.
[0024]
As shown in FIG. 6, the moving direction of the paired secondary object images 104f and 104h is the alignment direction of the aperture openings 9f and 9h for the same reason as in the first focus detection system, and the sensor array is as shown in the figure. By setting to, the second condition has already been satisfied.
In FIG. 7, the focus detection area 112 in the second focus detection system becomes the central portion in the imaging surface 4 due to the above-described reason in addition to the above-described aperture interval.
[0025]
It is possible to detect the focal position of the objective lens by outputting the light amount distribution as an electrical signal using such an area sensor 13 and detecting the relative positional relationship between the images on the pair of sensor arrays as detection targets. Is possible. At this time, if a sensor array to be detected is appropriately selected, a two-dimensional imaging state can be detected on the imaging surface.
[0026]
Now, the two pairs of light receiving areas arranged orthogonally are positioned on a plane perpendicular to the optical axis, and are arranged in parallel to the direction of each pupil division to detect an accurate focus state. It is an indispensable condition. However, an error always occurs between the optical axis and each light receiving surface of the area sensor 13 due to single component accuracy, assembly error, and the like.
[0027]
First, considering the case where the area sensor 13 moves in the optical axis direction, the luminous flux emitted from the re-imaging lens block 10 is as follows. While spreading Therefore, when the area sensor 13 approaches the re-imaging lens block 10 (moves upward in FIG. 1), the secondary object image on the surface of the light receiving area is reduced with the optical axis as the center, and conversely, it is enlarged when it is farther away. It will be.
However, in this case, there is almost no difference in image magnification between the secondary object images paired in both the first and second focus detection systems, particularly in the direction orthogonal to the division of the pupil. The same object image is projected onto the sensor array, and the first and second focus detection conditions described above are satisfied. (However, the condition is that the light receiving surface position error is not extreme.)
[0028]
Next, in the case where the area sensor 13 rotates around the area sensor center A in FIG. 6, the paired object image is orthogonal to the pupil division in both cases of the first and second focus detection systems. If attention is paid to the direction of movement, the respective light receiving areas will move in opposite directions, so it is clear that the object images at different positions are projected onto the corresponding sensor rows, making it impossible to detect the focus. .
[0029]
Next, a state where the area sensor 13 is extremely inclined around the zz axis shown in FIG. At this time, as shown in FIG. 8, a difference in magnification occurs in the direction of the y-y axis due to the distance difference from the re-imaging lens block 10, and the secondary object images are 103e ', 103g', 104f ', 104h'. become. Here, the first focus detection system is greatly affected, and object images with completely different image magnifications are projected onto the paired light receiving areas 13e and 13g. An object image at a completely different position is projected onto a pair of sensor rows as it goes outward from the center in a direction orthogonal to the division of the pupil, and the first condition described above cannot be satisfied.
Note that the positional deviation in the pupil division direction can satisfy the second focus detection condition described above by correcting the relative relationship between the image positions in the pupil division direction.
[0030]
Next, when the area sensor 13 is extremely inclined about the yy axis shown in FIG. 6, the secondary object images are z-like 103e ″, 103g ″, 104f ″, 104h ″ as shown in FIG. A difference in magnification occurs in the z-axis direction, and the second focus detection system is greatly affected for the same reason as in the case around the z-z axis.
[0031]
Therefore, a mechanism for adjusting the position of the area sensor 13 with respect to the actual optical axis is required so as not to cause the above problem. However, the adjuster 14 and the sensor holding member 12 adjust the position of the area sensor 13. Hereinafter, the operation and adjustment procedure will be described with reference to FIGS. 4 and 5.
4 is a side view of the sensor adjustment mechanism, and FIG. 5 is a sectional view taken along the line kk of FIG.
The package of the area sensor 13 is held by semicircular cutouts 13b (see FIG. 2) and bottom portions provided on the four sides by an adjustment tool (not shown). The adjusters 14 are both spring-biased in the direction F by a tool (not shown).
When the area sensor 13 is moved by the adjusting tool, the sensor holding member 12 follows the urging force applied to the adjuster 14 while being in contact with the cover glass 13a.
[0032]
As an adjustment procedure, an adjustment corresponding to the rotation around the area sensor center A is first performed. Here, the first focus detection system FIG. The output of the sensor array corresponding to the position P shown in FIG. The reason is that the central sensor row is not easily affected by the tilt of the area sensor around the yz axes and the zz axes that are not adjusted at this stage.
[0033]
For the adjustment, two oblique charts V and W shown in FIG. 7 are given as projection objects at the same distance. The secondary object images of these charts should be formed as Ve, Vg, We, Wg as shown in FIG. 10, but if the area sensor 13 is rotating clockwise, the chart V , W secondary object images are formed on the light receiving areas 13e, 13g as Ve ′, We ′, Vg ′, Wg ′ indicated by broken lines. Therefore, a difference of ΔV−ΔW occurs between the chart V and the chart W in the relative positional relationship between the image signals obtained by the two sensor arrays at the center. Since such a difference does not occur for object images at the same distance, the area sensor 13 may be rotated around the optical axis by an adjustment tool so as to cancel this difference.
[0034]
Next, position adjustment corresponding to the rotation of the area sensor 13 around the zz axis is performed.
This time, adjustment is performed using a sensor array corresponding to the outer edge Q or R of the focus detection range of the first focus detection system shown in FIG. This is because the outside of the focus detection area is most affected by the difference in image magnification as described above. The principle of adjustment is the same as described above, and two oblique charts are placed at the Q or R position, and the area sensor 13 may be tilted so as to eliminate the difference in the relative positional relationship between the image signals of the corresponding sensor rows.
[0035]
FIG. 4 shows the movement of the sensor holding member 12 and the area sensor 13 when adjusting the tilt around the zz axis. That is, when the area sensor 13 is rotated around the zz axis (axis perpendicular to the paper surface at the position 13i in the figure) on the light receiving surface 13c on the sensor chip by the adjustment tool, the sensor holding member 12 is covered. While causing slight slippage with the glass 13 a, the adjuster 14 slides around the hinge portion 14 a and rotates to follow the area sensor 13.
[0036]
Finally, position adjustment corresponding to the rotation of the area sensor 13 around the yy axis is performed. here FIG. As shown in FIG. 4, adjustment is performed using a sensor array corresponding to the outer edge S or T of the focus detection range of the second focus detection system. Here, similarly, two diagonal charts may be placed at the position S or T, and the area sensor 13 may be tilted so as to eliminate the difference in the relative positional relationship between the image signals of the corresponding sensor rows.
[0037]
FIG. 5 shows the movement of the sensor holding member 12 and the area sensor 13 when adjusting the tilt around the yy axis.
First, when the area sensor 13 is tilted to the left as indicated by a solid line, the sensor holding member 12 is tilted in the same manner as the area sensor 13 by receiving the urging force of the adjuster 14, and the left and right adjusters 14 are vertically moved. It will be in a state with a step. Then, when the area sensor 13 is rotated clockwise around the yy axis (axis perpendicular to the paper surface at the position 13j in the drawing) on the light receiving surface 13c on the sensor chip by the adjustment tool, the sensor holding member 12 is While pushing up the left adjuster 14, the right adjuster 14 is rotated by following the area sensor 13 while being lowered by the biasing force F. When the area sensor 13 is rotated up to the two-dot chain line, the left and right adjusters 14 have steps opposite to the initial steps as indicated by the two-dot chain line 14 '.
[0038]
After the adjustment as described above, the AF main body block 24, the sensor holding member 12, and the area sensor 13 are bonded around the hinge portions 14 a of the two adjusters 14 at the left and right as shown by the hatched portion 30. At this time, an adhesive having a short curing time, such as a UV adhesive, is used and removed from the adjusting tool after curing by ultraviolet irradiation or the like.
[0039]
Therefore, as is apparent from FIGS. 4 and 5, in this embodiment, the tilt adjustment around the two axes with respect to the area sensor 13 is performed in a limited small space between the AF main body block 24 and the area sensor 13. Can do. Moreover, since the adjusters 14 can move in the optical axis direction, for example, the area sensor 13 In the direction of the optical axis Even if the dimensions are changed, the light receiving surface 13c can be arranged at an ideal position without changing the shape of any part.
[0040]
FIG. 11 shows a second embodiment of the present invention. In order to simplify the description, the same parts as those in the first embodiment are denoted by the same reference numerals, and only different points will be described.
FIG. 11 is a front view of the main part of the sensor adjustment mechanism.
In this embodiment, one of the hinge portions 14a of the adjuster 14 (the right side in the drawing in the present embodiment) is a fixed hinge portion 24b formed integrally with the AF main body block 24. Other configurations are the same as those of the first embodiment.
[0041]
In the present embodiment having the above configuration, the initial position of the area sensor 13 in the optical axis direction can be easily determined using the fixed hinge portion 24b as a clue, and the number of parts can be reduced.
In the tilt adjustment around the yy axis, the area sensor 13 rotates around the contact portion between the sensor holding member 12 and the fixed hinge portion 24b of the AF main body block 24. The change in angle in quantity is narrower than in the first embodiment. In addition, a slight change in the optical axis direction of the light receiving surface 13c also occurs, but as described above, it hardly affects the focus detection.
[0042]
【The invention's effect】
As described above, the present invention described in claim 1 includes an imaging lens, a light receiving element on which an object image is projected by the imaging lens, and a sensor holding member that holds the light receiving element. In the light receiving element position adjusting device that requires tilt adjustment around the first and second axes perpendicular to the optical axis of the imaging lens and perpendicular to each other, the sensor holding member is The light receiving element can be tilt-adjusted around the first axis by being rotatably attached to a pair of hinge parts arranged in parallel with one axis, and at least one of the hinge parts advances and retreats in the optical axis direction. Since the light receiving element can adjust the inclination around the second axis, only the sensor holding member exists between the imaging lens and the light receiving element, and can be configured in a very space-saving manner. Minimize the reduction magnification of the secondary imaging system It is highly effective in the area AF with Kusuru necessary, also configuration is simple, the assembling workability for easy fixing of the adjusted light receiving element is very well.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a camera having a focus detection system in an area AF according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view showing a configuration of an AF main body block of the focus detection system.
FIG. 3 is a plan view similarly showing the configuration of the first sub-mirror.
FIG. 4 is a side view showing an adjustment state of the area sensor, similarly;
5 is a cross-sectional view taken along the line kk of FIG.
FIG. 6 is also an explanatory view showing a light receiving area of the area sensor.
FIG. 7 is an explanatory diagram showing a focus detection range on an imaging screen.
FIG. 8 is a first explanatory diagram showing the influence of the tilt of the area sensor.
FIG. 9 is a second explanatory diagram showing the influence of the tilt of the area sensor.
FIG. 10 is an explanatory diagram of a procedure for adjusting the tilt of the area sensor.
FIG. 11 is a front view showing an adjustment state of an area sensor in a second embodiment of the present invention.
[Explanation of symbols]
1 .... lens mount, 2 .... main mirror, 3 .... first sub mirror, 6 .... second sub mirror, 9 .... stop, 10 .... re-imaging lens block, 11 .... third sub mirror, 12..Sensor holding member, 12a..Sliding part, 13..Area sensor, 13e, 13f, 13g, 13h..Light receiving area, 14..Adjuster, 14a..Hinge part, 15..Mask, 24. AF body block, 24b. Fixed hinge part.

Claims (1)

An imaging lens; a light receiving element on which an object image is projected by the imaging lens; and a sensor holding member that holds the light receiving element. The light receiving element is perpendicular to the optical axis of the imaging lens. In the device for adjusting the position of the light receiving element that requires the tilt adjustment around the first and second axes orthogonal to each other, the sensor holding member rotates with a pair of hinge portions arranged in parallel with the first axis. It is possible to adjust the inclination of the light receiving element around the first axis, and when at least one of the hinge portions moves back and forth in the optical axis direction, the light receiving element can be adjusted to tilt around the second axis. An apparatus for adjusting the position of a light receiving element, characterized in that

Images