JPH0755555Y2 - Angle adjustment device for mirror of single-lens reflex camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an apparatus for adjusting an angle of a main mirror showing a screen condition of a single-lens reflex camera and a mirror such as a sub-mirror used for photometry.

(Prior art and problems to be solved) The structure of the main mirror that swings between the position where the screen condition is observed by the viewfinder and the retracted position during shooting, and the sub-mirror that is swingably provided with respect to this main mirror Various proposals have been made, for example, Japanese Utility Model Publication No. 19192/1986.

In order to maintain the correct angle with respect to the optical axis of the single-lens reflex camera, both mirrors are often provided with angle fine adjustment means at the position where the state of the screen is observed by the viewfinder.

The adjustment of the angle is usually performed and fixed in the manufacturing process, but the adjustment may be deviated for some reason and it may be necessary to readjust it in the repair process.

In such a structure, if the adjustment result of one influences the other, adjustment is not impossible but extremely difficult.

The object of the present invention is that it is not necessary to readjust the angle of the sub mirror after readjusting the angle of the main mirror, and it is not necessary to readjust the angle of the main mirror to readjust the angle of the sub mirror. An object of the present invention is to provide a mirror angle adjusting device for a single-lens reflex camera.

(Means for Solving the Problem) In order to achieve the above object, the mirror angle adjusting device for a single-lens reflex camera according to the present invention has a second position for retracting from a first position where a screen condition is observed by a finder at the time of photographing. In a mirror angle adjusting device of a single-lens reflex camera having a main mirror swinging between positions and a sub-mirror swingably provided with respect to the main mirror, a hinge provided on a rotatable member of the main mirror is used. And a rotation direction of the hinge is substantially parallel to a surface of the sub-mirror at the regular angular position of the first position, and the sub-mirror is swingably supported by a hinge provided on the main mirror frame,
The main mirror is provided so as to be able to move in parallel while maintaining a regular angle by an adjusting means including two eccentric pins, a main mirror hinge position adjusting eccentric pin and a main mirror angle adjusting eccentric pin. The direction of the parallel movement is configured to be substantially parallel to the surface of the sub mirror at the regular angular position.

(Embodiment) A mirror angle adjusting device of a single lens reflex camera according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a right side view of an embodiment of a mirror mechanism using an apparatus for adjusting a mirror angle of a single lens reflex camera according to the present invention, and FIG. 2 is a left side view of the embodiment of the mirror mechanism. In addition,
In FIG. 2, the light receiving elements and the like are omitted and shown in a simplified manner.

FIG. 3 is a right side view of an embodiment of the mirror mechanism for explaining the angular positional relationship of the mirror and the like.

The U-shaped lever 5 is supported by a lever hinge 5a fixed to a side wall of a mirror box (not shown), and is rotatably provided around the hinge 5a.

The main mirror hinge 5b is fixed to the U-shaped lever 5.

The main mirror 1 of the main mirror assembly is fixed to a main mirror frame 2, and the main mirror frame 2 is provided with a main mirror hinge 5b.

The main mirror 1 is rotatable around the main mirror hinge 5b.

One of the springs 13 is hooked on the lever 5 and the other is hooked on the main mirror frame 2, which imparts a counterclockwise rotational force to the main mirror assembly.

The main mirror hinge 5b described above is rotated around the hinge 5a.

The tangent line (l ₁ ) of the locus of rotation of the main mirror hinge 5b during the main adjustment is provided so as to be substantially parallel to the surface (L) at the regular angular position when the sub mirror 3 is used, which will be described later.

The lower limit position of the main mirror frame 2 is defined by the main mirror angle adjusting eccentric pin 6. The position of the main mirror frame hinge 5b is adjusted by the main mirror hinge position adjusting eccentric pin 7 adjusting the position of the U-shaped lever 5.

The sub mirror 3 of the sub mirror assembly is fixed to the sub mirror frame 4, and the sub mirror frame 4 is supported by the sub mirror hinge 2 a fixed to the main mirror frame 2.

One of the springs 14 has a post 4a fixed to the sub-mirror frame 4
The other side is fixed to the side wall of the mirror box (not shown).

The sub-mirror assembly is biased counterclockwise by the spring 14 and rotated about the sub-mirror hinge 2a.

The illustrated position of the sub mirror frame 4 is defined by the eccentric pin 8 for adjusting the sub mirror angle.

In FIG. 2, the mirror up lever 15 is supported by a mirror up lever hinge 15a fixed to a side wall of a mirror box (not shown), and is rotatably provided around the mirror up lever hinge 15a. .

A post 15b fixed to the mirror up lever 15 enters a long groove 2b formed in the main mirror frame 2.

A post 15c is fixed to the mirror up lever 15, and a cam 5c is formed on one side of the lever 5.

In FIG. 1, the condenser lens 9, the half mirror 10, and the light receiving elements 11 and 12 are integrated by a holder (not shown) and fixed to the lower portion of a mirror box (not shown).

The general operation of the mirror mechanism of the single-lens reflex camera is as follows.

At the first position where the screen condition is observed by the finder, the light reflected by the main mirror 1 is guided to the finder as shown in FIG. To form a primary image on the equivalent surface of the film.

In order to form the primary image accurately on this surface, the main iller 1 is kept at 45 ° with respect to the optical axis of the camera, and the surface of the main mirror 1 is exactly 45 ° with the film equivalent surface. It is necessary to keep the angle and adjustment is necessary.

The light receiving lens 9 forms the primary image on the light receiving element 11 and the light receiving element 12 via the half mirror 10, respectively.

Therefore, the optical axis of the camera and the optical axis of the condenser lens 9 must maintain the relationship between the incident angle and the reflection angle with respect to the sub mirror 3, and adjustment is required.

The light receiving element 11 is for TTL direct light control and TTL spot flash meter, and the light receiving element 12 is for TTL spot metering.

As described above, the light can be divided and supplied by the half mirror 10 to the elements having different uses and functions, and a plurality of photometric methods can be realized by using one optical system.

Also, by adjusting the transmittance of the half mirror 10,
It is possible to adjust the amount of light guided to each light receiving element, and thus it is possible to obtain a dynamic range suitable for the purpose.

In the shooting state, the mirror up lever 15 is interlocked with a quick return mechanism (not shown in FIG. 2).
Starts rotating counterclockwise around the mirror up lever hinge 15a.

Along with the rotational movement of the mirror up lever 15, a pin 15c fixed to the lever 15 hits a cam 5c formed on the lever 5 to rotate the lever 5 counterclockwise and fix it to the mirror up lever 15. The main mirror 1 is retracted along the locus of the main mirror frame hinge 5b fixed to the lever 5 while rotating counterclockwise by the pin 15b in the long groove 2b formed in the main mirror frame 2. become.

Further, the sub-mirror 3 also moves the sub-mirror frame hinge 2a as the main mirror 1 retracts in FIG. 1, and as is generally known, the sub-mirror frame is formed in a long groove formed on the side wall of the mirror box (not shown). The post 4a fixed to 4 hits. Then, the counterclockwise rotation of the sub-mirror 3 is regulated, and the moment applied to the sub-mirror frame 4 by the spring 14 at a certain position is changed from the counterclockwise direction to the clockwise direction, so that the main mirror frame 2 is covered with the outerwear Then, it becomes a retracted state.

The reverse operation is performed when returning from the retracted state.

The main mirror 1 has an eccentric pin 6 for adjusting the main mirror angle.
Adjusted to a more regular angle.

Further, by combining with the adjustment of the eccentric pin 7 for adjusting the main mirror hinge position, the main mirror 1 can be moved in parallel while keeping the angle of the main mirror 1 in a normal state.

The sub mirror 3 is adjusted to a regular angle by the eccentric pin 8 for adjusting the sub mirror angle.

The main mirror frame hinge 5b is fixed to the lever 5, and the lever 5 can rotate about the lever hinge 5a. Therefore, the main mirror frame hinge 5b rotates about the lever hinge 5a.

At this time, in FIG. 3, when the normal angle with respect to the optical axis of the sub-mirror 3 is θ, the main mirror frame hinge 5b is rotationally moved in a direction in which a straight line l ₁ parallel to the straight line L having an inclination θ is substantially tangent. With this configuration, the main mirror frame hinge 5b moves along the substantially straight line l ₁ .

Therefore, when the main mirror 1 is adjusted to a regular angle, the sub-mirror frame hinge 2a also moves substantially along the straight line l ₂ parallel to the straight line L.

Therefore, after readjusting the angle of the main mirror 1,
There is no need to readjust submirror 3.

Further, since the main mirror 1 can be moved in parallel while maintaining the regular angle, it is possible to prevent one-sided blur of the image on the focus glass due to readjustment.

Further, since the sub mirror 3 is supported by the sub mirror frame hinge 2a, it is not necessary to readjust the main mirror 1 even if the angle of the sub mirror 3 is readjusted.

The adjustment of the mirror in the manufacturing process will be described as an example. All mirror adjustments are done with respect to the lens mount.

(1) Adjust the angles of the main and sub mirrors with the mirror box alone.

(2) Attach the mirror box to the lens that is focused on the surface corresponding to the film in advance.

(3) Adjust the focus glass and fix it at the focus position.

At this point, the film equivalent surface and the focus glass have an equivalent positional relationship.

(4) Install the mirror box in the body.

(5) Assemble the camera to the completed state.

(6) The rail is ground to have a predetermined size based on the lens mount and a distance from the lens mount to the rail surface. As a problem that occurs at this time, the rail surface is cut too much. A void appears on the processed rail surface, and the rail is ground until the void is no longer visible.

As a result, the distance from the lens mount to the rail surface becomes shorter than the predetermined dimension.

Therefore, (7) insert a washer or the like between the lens mount and the mirror box mounting surface to adjust the distance between the lens mount and the rail surface to a predetermined dimension.

○ For this reason, the focus position of the focus glass adjusted in (1), (2), and (3) goes wrong. That is, since the lens mount is moved forward, the optical path length is extended. Disassembling the camera and re-adjusting the focus glass is time consuming, laborious and inefficient.

(8) Shake the angle of the mirror to absorb the extended optical path length.

○ Here, the image on the optical axis (translation is not necessary if only focusing is considered.) However, in order to focus from one corner to another on the focus glass, it is necessary to move the mirror in parallel. .

At the time of repair Dismantling repair is almost the same as manufacturing.

If the focus on the focus glass is out of order for some reason, for example, if the size of the replaced focus glass has not been adjusted, adjust the angle of the main mirror and focus on the focus glass. , There is no need to readjust the angle of the sub-mirror.

Various modifications can be made to the embodiment described in detail above within the scope of the present invention.

Since the hinge and the hinge hole are relative, any of them may be the shaft.

The sub-mirror hinge fixed to the main mirror frame
It suffices that the main mirror is adjusted to move in a direction substantially along the straight line formed by the normal angle of the sub mirror.

The method of guiding the light to the plurality of light receiving elements is not limited to the half mirror and may be a prism.

(Effects of the Invention) As described in detail above, in the mirror angle adjusting device for a single-lens reflex camera according to the present invention, the main mirror is supported by the hinge provided on the rotatable member, and the rotation direction of the hinge is The sub mirror is substantially parallel to the surface at the regular angular position at the first position, the sub mirror is swingably supported by the hinge provided on the main mirror frame, and the regular angle is secured by the adjusting means. The main mirror is provided so as to be movable in parallel, and the direction of the parallel movement of the main mirror is substantially parallel to the surface of the sub-mirror at the regular angular position.

Therefore, it is not necessary to readjust the angle of the sub mirror after readjusting the angle of the main mirror.

There is no need to readjust the angle of the main mirror to readjust the angle of the sub mirror.

After the readjustment of the angle of the main mirror, one-sided blurring of the image on the focus glass does not occur.

A plurality of light receiving elements can be properly used in one optical system for photometry with different purposes and functions.

[Brief description of drawings]

FIG. 1 is a right side view of an embodiment of a mirror mechanism using a mirror angle adjusting device of a single lens reflex camera according to the present invention. FIG. 2 is a left side view of an embodiment of the mirror mechanism. FIG. 3 is a right side view of an embodiment of the mirror mechanism for explaining the angular positional relationship of the mirror and the like. 1 …… Main mirror 2 …… Main mirror frame 2a …… Sub mirror hinge 3 …… Sub mirror 4 …… Sub mirror frame 4a …… Post 5 …… Lever 5a …… Lever hinge 5b …… Main mirror hinge 6 …… Main mirror angle Adjustment eccentric pin 7 …… Main mirror hinge position adjustment eccentric pin 8 …… Sub-mirror angle adjustment eccentric pin 9 …… Receiving lens 10 …… Half mirror 11 …… Receiving element 12 …… Receiving element

Claims (1)

[Scope of utility model registration request] 1. A main mirror that swings between a first position for observing a screen condition by a finder and a second position that is retracted at the time of photographing, and a sub-mirror swingably provided with respect to this main mirror. In a mirror angle adjusting device for a single-lens reflex camera, a main mirror is supported by a hinge provided on a rotatable member, and a rotation direction of the hinge is a surface at a regular angular position of the sub-mirror at the first position. And a sub-mirror that is swingably supported by a hinge provided on a main mirror frame, and that includes a main mirror including two eccentric pins, a main mirror hinge position adjusting eccentric pin and a main mirror angle adjusting eccentric pin. It is provided so as to be able to move in parallel while the regular angle is ensured by the adjusting means configured, and the direction of the parallel movement of the main mirror is set in front of the sub-mirror. An angle adjusting device for a mirror of a single-lens reflex camera, which is configured to be substantially parallel to a surface at a regular angular position.