JPS58139131A - Inclination adjusting mechanism of photodetector - Google Patents

Abstract

PURPOSE:To shorten the adjustment time and to reduce the production cost, by adjusting longitudinal and lateral inclinations of a photoreceptor independently of each other. CONSTITUTION:A photodetector 3 is held on an element substrate 4 by a proper means so that the light receiving face is turned up, and a plane and U-shaped element supporting plate 5 is fixed pivotally under the element substrate 4. In case of the adjustment for the lateral inclination of the photodetector 3, an adjusting screw 12 is turned to perform the adjustment. The first lever 8 is turned by rotation of the screw 12, and one side part of the element substrate 4 fixed pivotally to one side plate 5b of the element supporting plate 5 is moved vertically in accordance with this turning to adjust the lateral inclination of the photoreceptor 3, and the attitude of the element substrate 4 in the longitudinal direction is not changed in this case. In case of the adjustment for the longitudinal inclination of the photodetector 3, an adjusting screw 17 is turned to turn the second lever 15. In this case, the attitude of the element substrate 4 in the lateral direction is not changed at all.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tilt adjustment mechanism of a light receiving element for exposure control or a light receiving element for distance measurement in a -eye reflex camera, for example.

For example, in a -eye reflex camera, in order to guide the incident light from the photographic lens to the light receiving element for output control or the light receiving element for distance measurement, a part of the incident light is passed through the main mirror for the finder, and then the main mirror There is one in which the light is reflected by a rear sub-mirror and guided to a light receiving element. It is required that this light-receiving element be made small. The inclination of the light-receiving surface of the light-receiving element with respect to the incident optical axis includes a left-right inclination and a front-back inclination when looking at the front of the camera. Adjustment screws were brought into contact with each of the three points, and the inclination of the light-receiving element was adjusted using the adjustment screws.

According to this conventional adjustment mechanism, the configuration is simple, but for example, if you try to adjust the tilt in the left-right direction, the tilt in the front-back direction will also change, and if you try to adjust the tilt in the front-back direction, the tilt in the left-right direction will also change. , adjustment is extremely troublesome. Moreover,
In the case of a distance-measuring light-receiving element, when adjusting the focus, three adjustment screws must be moved by the same amount at the same time, but this inevitably causes tilting. In this case, if the adjustment is done using optical means such as a collimator, the left and right
Since the front and rear tilts can be evaluated at the same time, the adjustment is not that troublesome. However, in the case of distance-measuring photodetectors, evaluations of left and right tilts and front and rear tilts are evaluated separately because they are evaluated electrically. Therefore, in order to see the change in the slope caused by adjusting one slope, it is necessary to switch the electrical output for evaluation, making the adjustment extremely troublesome.

An object of the present invention is to provide a tilt adjustment mechanism for a light receiving element, which is capable of independently adjusting the front and back and left and right tilts of a light receiving element, thereby reducing adjustment time and production costs. Our goal is to provide the following.

The present invention will be explained below with reference to illustrated embodiments.

In FIGS. 1 and 2, a main mirror 1 is installed obliquely on the incident optical path from the photographic lens, and most of the incident light is reflected upward by the mirror 1 and focused on the focusing glass. Mirror 1
A portion of the incident light transmitted through the main mirror 1 is reflected downward by a sub-mirror 2 provided obliquely behind the main mirror 1, and enters a light-receiving element 3.

In FIGS. 1 to 4, the light-receiving element 3 is held on the element substrate 4 by appropriate means with the light-receiving surface facing upward. Below the element substrate 4, there are both side plates 5a that are parallel to each other.
, 5b, and downwardly bent portions 4 formed on both sides of the rear part (2) of the element substrate 4 (right side in Figure 1, upper part in Figure 3).
a14b are pivotally connected to the rear portions of the side plates 5a, 5b of the element support plate 5 by respective shafts 6°7. The tip of one side plate 5b of the element support plate ε is connected to the tip of the second lever 8 with a shaft 9.
It is pivoted by. The lever 8 is provided parallel to the side plate 5b of the element support plate 5, and its base end is pivotally attached to the fixed shaft 10 so as to be rotatable in a vertical plane.

The lever 8 has a tendency to rotate clockwise in FIG. 2 and counterclockwise in FIG. 4 about the shaft 101 due to the elasticity of the spring 11. The tip of the left-right tilt adjusting screw 12 comes into contact with the lower surface of the bent portion 8a formed in the bending portion 8a, thereby restricting the rotation due to the above-mentioned habit.

The tip of the other side plate 5a of the element support plate 5 is pivotally attached to a fixed shaft 14, and the base end of a second lever 15 is also pivotally attached to the fixed shaft 14. The second lever 15 is the element support plate 5
The spring 16 is provided parallel to the side plate 5a of
It has a tendency to rotate clockwise in FIGS. 1 and 4 due to the elasticity of the bending portion 15a, but when the tip of the longitudinal inclination adjustment screw 17 comes into contact with the lower surface of the bent portion 15a, this tendency is prevented. Rotation is restricted. 2nd lever 1
An intermediary lever 19 is pivotally attached to the distal end of the lever 5 by a shaft 18 so as to be rotatable in a vertical plane. The intermediate lever 19 is located between the side plate 5a of the element support plate 5 and the second lever 15. The intermediary lever 19 has bins 19a and 19b at positions with different rotation radii, and these bins 19a and 19b are connected to the side plate 5 of the element support plate 5.
a and the element substrate 4. The wound portion of the spring 20 is inserted into the Ail axis B, one end of the spring 20 is attached to the lower edge of the side plate 5a of the element support plate 5, and the other end of the spring 20 is attached to the bent portion 4C of the element substrate 4. The element substrate 4 and the element support plate 5 are urged to be attracted to each other by the elasticity of the spring 20. However, the gap between the element substrate 4 and the element support plate 5 is such that the pin 19a of the intermediate lever 19 touches the upper edge of the side plate 5a of the element support plate 5, and the pin 19b of the intermediate lever 19 touches the bottom surface of the element substrate 4. It has come to be regulated by the following. Side plate 5a of element support plate 5
A bending portion 5C is provided at the lower edge of the bending portion 5C.
The tip of the focus adjustment screw 21 is in contact with the bottom surface of C. Therefore, by adjusting the screw 21, the element support plate 5 rotates around the fixed shaft 14, and the fulcrum of the element substrate 4 accordingly moves up and down, causing the element substrate 4 to rotate relative to each other. However, as the element support plate 5 rotates, the pin 19a of the intermediate lever 19 is moved up and down by the side plate 5a of the element support plate 5 and rotated about the shaft 18, and the free edge of the element substrate 4 is rotated. Other bin 191) with intermediate lever 19 in the closer position
Therefore, it can be moved up and down. Here, the position of the shaft 18 of the intermediate lever 19 is set to the position 5 of the two bins 19a and 19b, and therefore, by adjusting the screw 21, the element substrate 4 and the light receiving element 3 integrated therewith are aligned with the incident optical axis. It will move vertically in parallel while maintaining a constant posture.

In addition, each adjustment screw 12, 17, 21 has a predetermined stationary part,
For example, assume that it is screwed into the bottom plate of a mirror box.

Next, the operation of the above embodiment will be explained. Now, light receiving element 3
When trying to adjust the left and right inclination of the holder, that is, the difference in level between the left side and the right side in FIG. 3, turn the adjusting screw 12 to adjust it. As the screw 12 rotates, the bent portion 8a of the lever 8 moves up and down, the lever 8 rotates, and the height position of the shaft 9 changes. Accordingly, one side plate 5b of the element support plate 5 and one side part of the element substrate 4 pivotally attached to this side plate 5b are in the vertical movement direction, that is, at the upper side level as shown in FIG. The position does not change at all. In addition, in the case of adjusting the left and right tilt as described above, there is no special rotation axis, but the tilt of the light receiving element is originally adjusted within an extremely small range, and the angle between the element support plate 5 and the shaft 14 is A slight wobbling or a slight deflection of the element support plate 5 is allowed. Of course, if necessary, a shaft may be provided that allows the element support plate 5 and the like to be tilted from side to side.

Next, when the inclination of the light-receiving element 3 in the front-rear direction is to be adjusted, the adjustment screw 17 is turned to make the adjustment.

The rotation of the screw 17 causes the second lever 15 to rotate, and the shaft 18
This is substantially the same as when the intermediate lever 19 is rotated about the pin 19a by moving the position up and down.

As a result, the height position of the pin 19b changes, and while the height position of the shafts 6 and 7 of the element substrate 4 remains unchanged, the level of the free end changes, thereby causing the element substrate 4 and the light receiving element to change. 3
The inclination in the front-back direction is often adjusted. At this time,
There is no change in the horizontal orientation of the light-receiving element substrate 4.

After adjusting the front-rear and left-right tilts of the light-receiving element 3 in this way, in order to correctly form an image on the light-receiving surface of the light-receiving element 3,
When attempting to adjust the focus so that the light receiving surface of the light receiving element is precisely at a position conjugate with the photographic film surface, the focus adjustment screw 21 is rotated. As described above, the rotation of the screw 21 causes the element substrate 4 and the light-receiving element 3 to move in parallel in the optical axis direction, thereby adjusting the focus. At this time, the light-receiving element and the substrate 4 do not tilt forward or backward or left or right.

As described above, according to the present invention, it is possible to independently tilt the light-receiving element in the left-right direction and the front-back direction.
Compared to conventional mechanisms, the tilt of the light receiving element can be adjusted much more easily.

In particular, as in the case of distance-measuring light-receiving elements, the inclination of the light-receiving element is 6.
This is effective in the case where adjustment or focus adjustment is performed while electrically adjusting the curve.

In the illustrated embodiment, the light-receiving element adjustment mechanism is applied to an X-eye flex camera, but the present invention can be applied to any device in which a light-receiving element is used.

[Brief explanation of drawings]

FIG. 1 is a right side view showing an embodiment of the present invention, FIG. 2 is a left side view of the same, FIG. 3 is a plan view, and FIG. 4 is an exploded perspective view. 3... Light receiving element, 4... Element substrate, 5... Element support plate, 6.7... Shaft, 8... Louver, 9... Shaft, 10... Fixed axis, 12...Left and right tilt adjustment screw, 1
4...Fixed shaft, 15...Second lever, 17...Back and forth tilt adjustment screw, 18...Shaft, 19...Intermediate lever, 19a, 19b,... Bin.

Claims (1)

[Claims] 1. An element support plate having one end pivotally attached to the element substrate holding the light receiving element, a first lever having one end pivotally attached to a fixed shaft and the other end pivoting to the element support plate, and a third lever sandwiching the element support plate. a second lever located on the opposite side of the lever and pivotally connected to the fixed shaft;
An intermediary lever is pivotally attached to the second lever and contacts the element substrate and the element support plate at positions with different rotation radii, and the rotation position of the second lever and the rotation of the second lever A tilt adjustment mechanism for a light-receiving element, characterized in that the left-right and front-back tilt of the element substrate is adjusted by adjusting the position.