JPH0233136B2 - ICHIGANREFUKAMERANOMIRAACHOSEISOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention pivots a reflex mirror at the rotating end of a mirror support member that is pivotally supported on both sides of a mirror box and is swingably provided, so that when the mirror is raised, the mirror A mirror for adjusting the mirror position of a single-lens reflex camera (single-lens reflex camera) having a mirror drive mechanism of the type that rotates a support member to move the mirror in an arc toward the rear (toward the film gate side) of the pivot position of the mirror. This invention relates to an adjustment device.

As shown in Fig. 1, a single-lens reflex camera has a reflex mirror M arranged on the photographic optical path that passes through the photographic lens L and reaches the film F, and the optical path reflected by the mirror M corresponds to the position of the film F surface. A focusing screen S is provided, and the image formation state on the focusing screen S is observed with a viewfinder to perform focusing (so-called focusing) of the lens L. At the time of release, the mirror M is raised and moved out of the photographing optical path, and a shutter (not shown) is opened to form a subject image on the film F and expose it. For this reason,
If the positions of the film F surface and the focusing screen S do not correspond correctly to the reflecting surface of the mirror M, accurate focusing will not be possible.
The position of the film surface F is determined mechanically by the film gate of the camera body, and can be achieved with high precision relatively easily, but the position of the focusing screen S depends on the processing accuracy of both the camera body and mirror box. It is difficult to obtain highly accurate positional relationships due to the influence of Furthermore, the accuracy of the 45° tilt position of the mirror M cannot be made highly accurate due to many unstable factors, making it difficult to accurately set the positions of the reflective surface of the mirror M and the screen S. Therefore, a spacer is inserted between the focusing screen S and the mirror box mounting part to adjust the relative position, but since only coarse adjustment is possible, fine adjustment of the relative position (including parallelism) is possible. This is done by adjusting the position and angle of the mirror M.

Japanese Patent Laid-Open No. 52-135727 discloses that a reflex mirror is pivotally supported at the rotating end of a mirror support member that is pivotally supported at both ends of a mirror box and swingably provided, and when the mirror is raised, the mirror is supported. A mirror drive mechanism that rotates a member to move the pivot position of the mirror in an arc toward the rear (towards the film gate) (this type of mechanism is called a "swing-back mirror up mechanism"), and when the mirror is raised, This is a single-lens reflex camera that has a mirror drive mechanism that reduces the protrusion of the mirror rotation end toward the lens, making the mirror movement less likely to be obstructed by the rear end of the photographing lens, which has a short back focus. The pivoting part of the mirror by the mirror support member at the mirror rest position and the stopper member to which the rotating end of the mirror is locked can be simultaneously displaced, and the position of the stopper member can be adjusted independently. , a system that solves the adjustment of the position and angle of the mirror with a simple configuration is shown.

However, the position and angle adjustment in this case is on the optical axis, that is, the center of the mirror, and the pivot positions of the mirror support member on both sides of the mirror box are aligned, that is, the left and right fulcrum axes of the mirror support member are aligned. It cannot be said to be complete unless it is matched correctly. If the left and right fulcrum sides are not adjusted to match, the viewfinder function may be impaired due to unilateral blurring of the viewfinder image due to left and right tilting of the mirror, or the function of the camera may be impaired due to unsmooth operation. become.

Conventionally, this matching adjustment of the left and right fulcrum axes has been carried out using, for example, the second
This was done using the configuration shown in the figure.

In Fig. 2, 1 is a mirror, 2 is a mirror support member that pivotally supports the mirror 1 at one end, and 3 is a mirror support member that is pivoted to the right side wall (left side in the figure) of a mirror box (not shown) at the center and supports the mirror at one end. A first adjustment lever that pivots on the right side of the other end of the member 2 and displaces the pivot point by rotation; 4 is a spring that biases the first adjustment lever 3 in a predetermined rotation direction; 5 is a first adjustment lever; 1 adjusting lever 3 with spring 4
The first adjusting screw 6 is rotated against the left side wall of the mirror box in the center (right side in the figure).
a second adjustment lever which is pivotally attached to the mirror supporting member 2 at one end, and which pivots to displace the pivot point in a direction substantially perpendicular to the displacement direction of the first adjustment lever; , 7 is a spring that biases the second adjustment lever 6 in the expected rotation direction, 8 is a second adjustment screw that rotates the second adjustment lever 6 against the spring 7, and 9 is a spring that biases the second adjustment lever 6 in the expected rotation direction. An eccentric pin 10 serving as a stopper member for locking the rotating end of the mirror 1 is pivotally attached to the left side wall of the mirror box at the center, supports the eccentric pin 9 in a rotatable manner, and rotates the eccentric pin 9. An adjustment cam that displaces the pivot shaft of the mirror 1 by an amount equal to the displacement; 11 is a spring that biases the adjustment cam 10 in a predetermined rotation direction; and 12 is an adjustment screw that rotates the adjustment cam 10 against the spring 11. be.

With this configuration, the eccentric pin 9 and the adjustment cam 10 adjust the mirror position and angle on the optical axis in the same manner as in the case of the above-mentioned Japanese Patent Laid-Open No. 52-135727. The first adjustment lever 3 and the second adjustment lever 6 are used to adjust the pivot point of the other end of the mirror support member 2, that is, the fulcrum axis position, in different directions on the right and left sides of the mirror box, respectively. The left and right fulcrum axes were adjusted to match.

However, in this case, adjustment must be made on both sides of the mirror box to match the left and right fulcrum axes, making the adjustment extremely complicated. There is a shutter control unit, mirror quick return mechanism, etc. on the film winding side, so there is almost no space available, and the left side, that is, the cartridge side, has more space than the right side, which is inappropriate. Ta.

The present invention has been made in view of the above circumstances, and is capable of adjusting the alignment of the fulcrum axes in response to left and right blurring and front and back blurring of the viewfinder image independently and even on only one side of the mirror box. It is an object of the present invention to provide a mirror adjustment device for a single-lens reflex camera that can be implemented with a simple configuration.

That is, a feature of the present invention is that a reflex mirror is pivotally supported at the rotating end of a mirror support member that is pivotally supported and swingably provided on both sides of a mirror box, and when the mirror is raised, the mirror is In a mirror adjustment device for adjusting the mirror position of a single-lens reflex camera having a mirror drive mechanism of a type that rotates a support member to move the pivot position of the mirror in a circular arc backward, the pivot end of the mirror support member is provided. at least one of the two sides,
A first position adjusting means for adjusting the position in a substantially approximate circular arc direction centered on the mirror pivot position in the rest position, and the pivot portion is adjusted in a substantially radial direction of the approximate circular arc independently of the first position adjusting means. The present invention also includes a second position adjustment means for position adjustment.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 3, parts that have substantially the same functions as those in FIG. 2 are given the same reference numerals, and their explanations will be omitted. FIG. 3 shows the state seen from the left side.
The shaft 13 is a left-hand pivot shaft of the mirror support member 2, and the right-hand pivot shaft is fixed, for example, to the right wall of a mirror box (not shown). axis 14
is a shaft for pivotally attaching the mirror 1 to the mirror support member 2; in this case, it engages with an adjustment cam 10 protruding to the left side of the mirror support member 2; Lever 15
is a mirror support member 2 with a shaft 13 coupled to one end.
The other end is pivotally connected to one end of a lever 17 via a shaft 16, and the intermediate portion is pivotally connected to one end of a lever 19 via a shaft 18. This lever 15 is biased to the left in the figure by a spring 20 at a location between the shaft 13 and the shaft 18 near the shaft 18. The other end of the lever 17 abuts the adjustment screw 21, and the intermediate portion is pivotally supported by a shaft 22. The other end of the lever 19 is the shaft 23
It is pivotally connected to one end of the lever 24 via a. The other end of the lever 24 abuts the adjustment screw 25, and the intermediate portion is pivotally supported by the shaft 22. The shaft 22 is fixed to the left side wall of the mirror box. The spring 26 urges the lever 17 clockwise in the drawing about the shaft 22, and the spring 27 urges the lever 24 counterclockwise in the drawing about the shaft 22. That is, the adjustment screw 21 is
7 in the counterclockwise direction in the drawing against the spring 26, and the adjusting screw 25 turns the lever 24 in the clockwise direction in the drawing against the spring 27.

These levers 15, 17, 19 and 24 are
A four-bar rotational chain mechanism is constructed, and one of the shafts 22, which is a rotation pair coupling point, is fixed to a mirror box.

Thus, the means for adjusting the relative positions of the pivot parts at both ends of the mirror support member 2 using the adjustment screw 21 is used as a first position adjustment means, and the adjustment means using the adjustment screw 25 is used as a second position adjustment means.

Next, the operation in such a configuration will be explained.

When lever 17 is pressed by adjusting screw 21,
The lever 17 rotates counterclockwise against the spring 26, moving the shaft 13 substantially downward in the figure and along an approximately approximate circular arc centered on the shaft 14 in the figure. At this time, the lever 24 is
It is fixed by the biasing force 7. The operation of the shaft 13 position by the adjustment screw 21, which is the first position adjustment means, is caused to move approximately along the approximate circular arc by the action of the link mechanism forming the four-section rotation chain, so the mirror support member 2 is not particularly supported. The right side rotation end will move upward, and the rotation axis of mirror 1 will also move in the same way, so the tilt of mirror 1 in the left and right direction will change, and this has nothing to do with adjusting the front and rear blur of the viewfinder image. Furthermore, the left and right blurring of the viewfinder image can be adjusted almost independently.

Furthermore, when the lever 24 is pressed by the adjustment screw 25, which is the second position adjustment means, the lever 24 rotates clockwise against the spring 27, and at this time, the lever 17, which is one of the four-bar rotation chain, Since it is fixed by the bias of the spring 26, the shaft 1
3 is moved in the direction toward the axis 14 in the figure along approximately the radial direction of the approximate arc. At this time,
The movement of the mirror support member 2 is based on the shaft 14 at the left rotation end.
3 gradually moves downward to the right in FIG. 3 while sliding on the cam surface of the adjustment cam 10, the right rotation end, which is not particularly supported (restricted), similarly gradually moves downward in parallel. Move to. Therefore, in the mirror 1 whose lower end is fixedly supported by the eccentric pin 9, only its upper end (pivot end) moves downward, and the inclination in the front and back direction changes. Therefore, front and back blur can be adjusted almost independently, regardless of left and right blur adjustment of the viewfinder image.

Since these adjustment operations are independent of each other, it is possible to easily match the left and right fulcrum axes, and it is possible to rationally prevent blurring of the viewfinder image, malfunctions, etc.

Moreover, since the adjustment mechanism can be configured on only one side, it is extremely advantageous in terms of space, and adjustment work can be easily performed.

Note that if the adjustment screw 21 is configured to be supported on the lever 17 side, all the mirror position and angle adjustments, such as alignment of the left and right fulcrum axes, can be made by adjusting from the front and bottom of the camera body, making it very difficult to assemble the camera. preferable.

Further, the adjustment screw 21 is placed in parallel with the adjustment screw 25,
The corresponding end of the lever 17 may be curved downward as shown in the figure to contact the adjustment screw 21. In that case, the position and angle of the mirror can be adjusted only from the bottom side, which is extremely convenient for assembling the camera. convenient.

Furthermore, the shaft on the right side of the mirror box corresponding to the shaft 13 was assumed to be fixed to the mirror box.
An adjustment mechanism similar to that for the shaft 13 may be provided for this shaft as well. In this case, there is an advantage that adjustment can be made by massaging any one side.

In addition, the present invention can be implemented in various modifications.

As detailed above, according to the present invention, the mirror adjustment device is capable of adjusting the alignment of the fulcrum axes in response to left and right blurring and front and back blurring of the viewfinder image independently and even on only one side of the mirror box. can be provided.

[Brief explanation of drawings]

FIG. 1 is a principle diagram for explaining the mirror adjustment of a single-lens reflex camera, FIG. 2 is a perspective view showing the configuration of an example of a conventional device, and FIG. 3 is a schematic configuration diagram showing the configuration of an embodiment of the present invention. It is. DESCRIPTION OF SYMBOLS 1... Reflex mirror, 2... Mirror support member, 9... Eccentric pin, 10... Adjustment cam, 1
1, 20, 26, 27...Spring, 12, 2
1, 25...adjustment screw, 13, 14, 16, 1
8, 22, 23...axis, 15, 17, 19, 24
……lever.

Claims (1)

[Scope of Claims] 1. A reflex mirror is pivotally supported at the rotating end of a mirror support member which is pivotally supported and swingably provided on both sides of a mirror box, and when the mirror is raised, the mirror support member is rotated. In the mirror adjustment device for adjusting the mirror position of a single-lens reflex camera, the mirror drive mechanism has a mirror drive mechanism of a type that moves the pivot position of the mirror in a circular arc rearwardly. a first position adjusting means for adjusting the position of one pivot in a substantially approximate circular arc direction centered on the mirror pivot position in the rest position; A mirror adjusting device for a single-lens reflex camera, comprising a second position adjusting means that adjusts the position independently of the adjusting means. 2. The first and second position adjustment means form a four-node rotation chain in which one rotation pair connection point is fixed to the mirror box, and the first and second position adjustment means rotate at the rotation pair connection point fixed to the mirror box. Either one of the third and fourth links facing the second link extends from the joint point of the third and fourth links and is connected to the pivot end of the mirror support member; When one of the first and second links is fixed and the other is rotated, the pivot position of the mirror support member is set in a substantially approximate circular arc direction centered on the mirror pivot position in the stationary position and the approximate circular arc. a link device that moves the link device in a substantially radial direction; a spring that biases the first and second links of the link device in respective predetermined rotational directions; and a spring that biases the first and second links of the link device in a direction of rotation; 2. The mirror adjusting device for a single-lens reflex camera according to claim 1, further comprising an adjusting screw for rotating the mirror box with respect to the mirror box. 3. The single-lens reflex camera according to claim 1 or 2, wherein the first and second position adjustment means are provided only on the side wall of the mirror box on the side of the cartridge storage section. Mirror adjustment device.