JPH11218802A - Single lens reflex camera and method for adjusting mirror assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make easily correctable a distortion when the distortion is caused in a pentagonal mirror assembly after mounting the pentagonal mirror assembly in a camera main body part in a single lens reflex camera using the pentagonal mirror assembly. SOLUTION: The single lens reflex camera 10 is equipped with the pentagonal mirror assembly 28 by which a subject image formed on a focusing screen 24 can be observed from a finder ocular part 30. The assembly 28 has a shell- like plastic mirror assembly body 32 provided with a roof mirror 36 and a plane mirror 38 in the inside. By bending the body 32, the roof angle of the mirror 36 is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a single-lens reflex camera and a method for adjusting a mirror assembly.

[0002]

2. Description of the Related Art The present single-lens reflex camera (hereinafter, referred to as "reflex camera")
Many single-lens reflex cameras have a horizontally extending focusing plate above a quick return mirror, and an eye that allows a subject image formed on the focusing plate to be observed as a top, bottom, left, right normal image. It has a level finder. A method using a pentagonal roof prism (hereinafter, referred to as a pentaprism) is predominantly used as a method for observing the subject image as a vertical, horizontal, or right normal image. In a camera, a system using a finder mirror assembly in which a plurality of mirror surfaces are combined to obtain the same optical path configuration as a pentaprism is also used. That is, since the pentaprism is configured such that an optical path is formed by a plurality of reflection surfaces using total reflection of the surface of the optical glass,
If a finder mirror assembly having mirror surfaces arranged at positions corresponding to the reflection surfaces of the pentaprism is used, the same optical action as when a pentaprism is used can be obtained. The finder mirror assembly thus configured will be referred to as a pentamirror assembly in the following description. When a pentaprism is used for a medium-sized camera, the weight of the pentaprism becomes considerably larger than that of a small camera.For a medium-sized single-lens reflex camera, a pentamirror assembly is used rather than a pentaprism. Is more advantageous.

As described above, the configuration of the pentamirror assembly corresponds to the configuration of the pentaprism. Therefore, the pentamirror assembly has a roof mirror that reflects light incident from the reticle and a light reflected by the roof mirror. A plane mirror that further reflects light and guides the light to a finder eyepiece. Many of the pentamirror assemblies have a shell-like mirror assembly body having a roof mirror and a plane mirror provided inside. The mirror assembly body
It is not necessarily configured as a single component, and may be configured by assembling or engaging a plurality of members. Among the mirrors of the penta-mirror assembly, there are various methods for forming a flat mirror. In some cases, a flat mirror member formed by depositing a metal film on a plate is attached to the inner surface of the mirror assembly body. On the other hand, the construction method of the Dach mirror generally produces a part forming at least a part of the mirror assembly body as a plastic molded article having a pair of inward flat surfaces which intersect at right angles to each other, and the pair of inward It is formed by depositing a metal film on a flat surface. Otherwise,
In most cases, the roof mirrors of a pentamirror assembly are constructed in this manner because it is not easy to form a roof mirror with sufficient performance at low cost.

[0004] To explain this further, in a pentaprism or pentamirror assembly, the mirror surface butting portion at the center of the roof mirror is located at the center of the field of view. Not done. Therefore, an easy method of abutting two glass mirrors at right angles cannot be used. According to the current state of the art, a method of manufacturing a roof mirror having a mirror surface abutting portion that is precise enough to be used for a finder is to form a pair of outwardly facing planes that intersect at right angles with each other on the surface of the prism, Either use the total internal reflection of a plane, or otherwise form a pair of inward-facing planes that intersect at right angles to each other on the surface of the precision plastic molding, and deposit a metal such as silver on those planes. Only two methods are practical methods. Needless to say, a pentaprism is formed by using the total reflection of the prism surface to form a roof mirror, and a pentamirror assembly is formed by using a precision plastic molded product. To this end, pentamirror assemblies often have a plastic shell-like mirror assembly body with a plurality of mirror surfaces inside.

[0005] The wall of the shell-shaped mirror assembly body is constructed to be quite thin, but rather than to reduce the weight, it is necessary to obtain the shape accuracy of the roof mirror. It is being done. That is,
Since the roof mirror forming portion is constituted by walls which are abutted at right angles, the abutting portion forms a shape unique portion, and a plastic molded product is liable to be distorted in the shape unique portion at the time of manufacturing. More specifically, if a plastic molded product has a corner having a shape in which two walls are abutted at a right angle, the inner corner side of the corner has heat in the cooling process after injection molding and is difficult to cool down. On the other hand, the outside corner side is very easy to cool. This difference in cooling rate causes distortion in the plastic molded article, but the difference in cooling rate becomes smaller as the wall thickness of the plastic molded article is reduced. Conversely, if the wall thickness is increased, a large distortion occurs and the accuracy of the shape of the roof mirror cannot be obtained, so that the wall thickness of the mirror assembly body must be reduced.

[0006]

The thin wall thickness of the mirror assembly body is advantageous for weight reduction, but on the other hand it has the problem of insufficient rigidity. That is, when a force is applied to the mirror assembly body when attaching the pentamirror assembly to the camera body (camera chassis or the like), the mirror assembly body is easily elastically deformed, so that the mirror surface of the pentamirror assembly is distorted. I do. Even if the distortion of the mirror surface is very small, the image of the subject in the viewfinder may be distorted and unsightly. For example, if a screw is used to attach a pentamirror assembly by screwing, a very strong force acts on the tightened portion of the screw and a twisting force also acts, so that a considerably large distortion is applied to the pentamirror assembly. This is highly likely to occur and is therefore unsuitable for screw mounting. In addition, with regard to the attachment of ordinary plastic parts, a method of fitting by snap-fitting using the elasticity of the plastic parts is often used, but if this method is used to attach the pentamirror assembly, the attachment is made. Since a residual elastic force is required to maintain the state, the pentamirror assembly may be distorted due to the residual elastic force. Therefore, this method is also unsuitable for mounting a pentamirror assembly.

[0007] For these reasons, in order to attach the penta-mirror assembly to the camera body, adhesives are frequently used at present, and silicone rubber-based adhesives are particularly preferred. Silicone rubber adhesive
Although the volume decreases somewhat during curing, the amount of the decrease is small, and since it remains soft after curing, the cured adhesive itself deforms, preventing the occurrence of distortion of the pentamirror assembly. It is reduced. However, even when a silicone rubber-based adhesive having such preferable characteristics is used, it is impossible to completely prevent the pentamirror assembly from being very slightly distorted after the bonding. Many cameras are rejected in final product inspection due to distortion of the subject image in the viewfinder due to distortion. Until now, if the pentamirror assembly mounted with adhesive had unacceptable distortion, it could not be easily corrected. for that reason,
In most cases, such defective cameras had to be discarded, resulting in considerable losses.

SUMMARY OF THE INVENTION The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a single-lens reflex camera using a finder mirror assembly, in which a finder mirror assembly attached to a camera body is distorted. In such a case, the distortion can be easily corrected. Another object of the present invention is to
An object of the present invention is to make it possible to easily correct a distortion in an optical device using a mirror assembly configured by combining a plurality of mirror surfaces, when the mirror assembly attached to the optical device has a distortion.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a single-lens reflex camera, in which a subject image formed on a reticle is observed from the viewfinder eyepiece of an eye-level finder as a vertical, horizontal, or right image. A finder mirror assembly for reflecting the light incident from the focusing screen, and a plane that further reflects the light reflected by the roof mirror and guides the light to the finder eyepiece. A mirror assembly body made of a shell-like elastically deformable plastic provided with a mirror inside; and a roof angle adjusting means for adjusting a roof angle of the roof mirror by bending the mirror assembly body. Features.
Also, the present invention provides a method according to the first aspect, wherein the roof mirrors are connected at right angles to each other and define a part of the mirror assembly body.
A first mirror surface and a second mirror surface which are respectively provided inside the wall portion and the second wall portion and which abut each other at right angles, and wherein the roof angle adjusting means is provided on the first wall portion; 2
It is characterized by comprising distance adjusting means for adjusting the distance between the end of the second wall away from the first wall and the end of the second wall away from the first wall.

In the present invention, the reticle may extend horizontally, the finder mirror assembly may be disposed above the reticle, and the mirror assembly body may include the first wall and the first wall. A top wall portion including the second wall portion and a peripheral wall portion connected to the top wall portion, the peripheral wall portion being formed in a shell shape, the peripheral wall portion having a front wall portion provided with the flat mirror inside; A rear wall having an opening facing the finder eyepiece, and left and right side walls extending in the front-rear direction, wherein the first wall and the second wall are arranged side by side. A right end of the first wall portion is connected to the right side wall portion, a left end of the second wall portion is connected to the left side wall portion, and one of the left and right side wall portions of the mirror assembly body is The other is fixed to the mirror assembly mounting portion of the camera body, and the other is the mirror. Are adjusted movable in the right and left with respect to the assembly mounting portion, said distance adjusting means,
The mirror assembly body is characterized by a position adjusting mechanism for adjusting and moving the position of the other side wall portion left and right. Further, the present invention is characterized in that the position adjusting mechanism is a screw mechanism interposed between the other side wall of the mirror assembly body and the mirror assembly mounting portion. Further, the present invention is characterized in that the position adjusting mechanism is a spacer member interposed between the other side wall portion of the mirror assembly body and the mirror assembly mounting portion. Further, the present invention is characterized in that the one side wall portion of the mirror assembly body and the mirror assembly attachment portion are engaged with each other via a locking structure for preventing relative movement in the horizontal direction. . Further, the present invention is characterized in that the left and right side walls of the mirror assembly body are adhered to the mirror assembly mounting portion using an adhesive which is easily deformed even after curing.

Further, the present invention provides a single-lens reflex camera, comprising a finder mirror assembly for enabling a subject image formed on a reticle to be observed from a finder eyepiece, wherein the finder mirror assembly has a roof mirror inside. A mirror assembly body made of a shell-like elastically deformable plastic provided with: a first portion of the mirror assembly body is fixed to a mirror assembly mounting portion of a camera body, and the first portion of the mirror assembly body is A second portion separated from the portion is configured to be movable relative to the mirror assembly mounting portion, and the mirror assembly is moved by moving the second portion of the mirror assembly body relative to the mirror assembly mounting portion; By bending the body, the roof angle of the roof mirror can be adjusted. It is characterized in. Further, the present invention provides a single-lens reflex camera, including a finder mirror assembly that allows a subject image formed on a reticle to be observed from a finder eyepiece, wherein the finder mirror assembly is provided with a roof mirror inside. A mirror assembly body made of a shell-like elastically deformable plastic; and a means for applying an external force to the mirror assembly body to bend, and applying an external force to the mirror assembly body to bend the roof mirror's roof angle. Is made adjustable.

The present invention also relates to a method for adjusting a mirror assembly in an optical apparatus using a mirror assembly formed by combining a plurality of mirror surfaces, wherein the mirror assembly is provided on a surface of an elastically deformable plastic mirror assembly body. The mirror assembly body is formed by providing mirror surfaces at a plurality of locations, a first location of the mirror assembly body is fixed to the optical device, and a second location separated from the first location of the mirror assembly body is attached to the optical device. Relative to the plurality of mirror surfaces by flexing the mirror assembly body by moving the second portion of the mirror assembly body relative to the optical device. It is characterized in that the angle is adjusted. The present invention also provides a method of adjusting a mirror assembly in an optical apparatus using a mirror assembly configured by combining a plurality of mirror surfaces, wherein the mirror assembly is provided at a plurality of locations on a surface of an elastically deformable plastic mirror assembly body. The mirror assembly is formed by providing a mirror surface, and the mirror assembly body is bent by applying an external force to adjust the relative position or relative angle of the plurality of mirror surfaces.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method for adjusting a single-lens reflex camera and a mirror assembly according to the present invention will be described with reference to the accompanying drawings. 1 is a sectional side view of a single-lens reflex camera according to an embodiment of the present invention, FIG. 2 is a right side view of a finder mirror assembly and a mirror assembly sheet used in the single-lens reflex camera of FIG. 1, and FIG. FIG. 4 is a left side view of the finder mirror assembly, and FIGS. 5A and 5B are a plan view and a sectional front view of the finder mirror assembly and the mirror assembly sheet. (A) and (b) are a plan view and a sectional front view of a finder mirror assembly and a mirror assembly sheet provided with a position adjusting mechanism of another specific example, and (a) and (b) of FIG. FIG. 2 is a plan view and a cross-sectional front view of a finder mirror assembly and a mirror assembly sheet provided with an example position adjustment mechanism. That. Note that, similarly to the description of the conventional technique, in the following description, the single-lens reflex camera will be simply referred to as a single-lens reflex camera, and the pentagonal roof prism will be simply referred to as a pentaprism.

FIG. 1 is a sectional side view of a medium-sized single-lens reflex camera 10 according to an embodiment of the present invention, in which a photographing lens is removed and only a camera body 12 is shown. The camera body 12 includes a lens mount 14, a quick return mirror 16, and a focal plane shutter 18. A focusing plate (focusing plate) 24 extending horizontally is disposed above the quick return mirror 16.
A subject image is formed on the focusing screen 24 by the photographing lens. The single-lens reflex camera 10 includes an eye level finder 26. The eye level finder 26
A finder mirror assembly 28 is provided above the focusing screen 24. The subject image formed on the focusing screen 24 is observed from the finder eyepiece 30 as a vertical, horizontal, and right normal image by the finder mirror assembly 28. I can do it.

The finder mirror assembly 28 is such that a plurality of mirror surfaces are combined to obtain the same optical path configuration as that of a pentaprism. As described in the description of the prior art, this is called a pentamirror assembly. To Penta mirror assembly 28
Is mounted on a mirror assembly mounting portion of the camera body. Here, the camera body refers to a structural part that forms a skeleton such as a camera chassis, but is not necessarily configured by a single member. In the illustrated embodiment, the mirror assembly mounting portion of the camera body is configured as a separate member 20, and then assembled to other portions of the camera body.
The member 20 constituting the mirror assembly mounting portion
Is hereinafter referred to as a mirror assembly sheet.
The mirror assembly sheet 20 has an upward facing horizontal support surface 2.
2 and the pentamirror assembly 28
2 and mounted on the mirror assembly sheet 20. 2, 3, and 5 (a) and (b) of FIG.
FIG. 5 is a view showing only those members 20 and 28 taken out in detail, and FIG. 5B is a sectional front view taken along line AA of FIG. 2. As shown in FIGS. 1 and 5, a rectangular opening 20a corresponding to the shape of the reticle 24 is formed in the mirror assembly sheet 20, and the pentamirror assembly is separated from the reticle 24 through the opening 22a. Light enters the interior of the light emitting device 28.

The pentamirror assembly 28 has a plastic shell-shaped mirror assembly body 32.
The mirror assembly body 32 has a shape in which a lower portion facing the reticle 24 and a rear portion facing the loupe ball 34 of the finder eyepiece 30 are open, and light incident from the reticle 24 (the optical axis of this light is A roof mirror 36 that reflects light L1 shown in FIG. 1), and a plane mirror 38 that further reflects the light reflected by the roof mirror 36 (the optical axis of this light is shown L2) and guides the light to the finder eyepiece 30. Are provided inside.

In the mirror assembly body 32, the front wall portion defining the formation portion of the plane mirror 38 is formed as one member by separating it from other portions, and the other portion is formed as another member. After being formed, these two members are joined and integrated. The latter member defines the lower opening of the mirror assembly body 32, the rear opening, and the formation of the roof mirror 36. Both of these two members of the mirror assembly body 32 are precision plastic moldings, and the formation of the roof mirror 36 and the formation of the plane mirror 38 of these members form a high-precision plane, and they are formed. It is manufactured so that the position and angle of the part can be designed values with high accuracy. As described in detail in the description of the prior art, when the wall thickness of those members is increased, the cooling rate during molding is reduced and accuracy is deteriorated. The completed pentamirror assembly 28 is easily elastically deformed by applying only a small force. This means that the rigidity is insufficient, which was a disadvantage in the past, but the present invention turns the disadvantage into an advantage by actively utilizing this characteristic. This will be described in more detail later. On the two members of the mirror assembly body 32 manufactured as precision plastic molded articles, metal is vapor-deposited on the formation part of the roof mirror 36 and the formation part of the plane mirror 38 to form a mirror surface. As the metal to be deposited, a metal having a high reflectance is used, for example, silver or aluminum.

The mirror assembly body 32 thus formed has a top wall portion and a peripheral wall portion connected to the top wall portion, and has a shell-like shape in which the lower portion facing the reticle 24 is open. The top wall of the mirror assembly body 32
As shown in FIGS. 5A and 5B, a substantially trapezoidal first
It is composed of a wall 40a and a second wall 40b, and a third wall 40c of a substantially isosceles triangle in front of the wall 40a, the first wall 40a and the second wall 40b are connected at right angles to each other. I have. A first planar mirror surface 36a is formed inside the first wall portion 40a, and a second planar mirror surface 36b is also formed inside the second wall portion 40b. , 36b are abutted at right angles to each other to form the roof mirror 36. On the other hand, the peripheral wall portion of the mirror assembly body 32 is shown in FIGS.
(B), a front wall portion 44 provided with a plane mirror 38 on the inside, a rear wall portion 46 formed with an opening 46a facing the finder eyepiece 30, and extend in the front-rear direction. It has left and right side walls 48a, 48b. FIG.
(B), the first wall portion 40a and the second wall portion 40b of the top wall portion of the mirror assembly body 32 are arranged side by side, and the right end of the first wall portion 40a is the right side wall portion 48a. (Note that FIG. 5 (b) is a view from the front, so the left side in the figure is the right side of the mirror assembly body 32), and the left end of the second wall 40b is the left side wall 48.
b.

The pentamirror assembly 28 having the above configuration
Are attached to the mirror assembly sheet 20, the left and right side walls 48a, 48 of the mirror assembly body 32 are attached.
One of b is fixed to the mirror assembly sheet 20, and the other of them is configured to be adjustable to the left and right relative to the mirror assembly sheet 20.
In the following description, for convenience of explanation, the right side wall portion 48a (left side in FIG. 5B) is referred to as a first side wall portion, and the left side wall portion 48a in FIG. 5B (see FIG. 5B). (Right side) side wall portion 48b
Is referred to as a second side wall. In order to achieve such a configuration, in the illustrated embodiment, the second side wall portion 48b and the mirror assembly sheet 20 are engaged with each other via a locking structure that restricts relative movement in the horizontal direction. And More specifically, two pins 50 protruding downward are formed on the end surface of the lower end of the second side wall portion 48b, while the upward supporting surface 22 of the mirror assembly sheet 20 is formed.
Are formed with two holes 52 in which the pins 50 are fitted at positions corresponding to the pins 50. The fitting of the corresponding pin 50 and the hole 52 prevents the relative movement in the horizontal direction between the second side wall portion 48b and the mirror assembly body 32.

Further, the second side wall portion 48b and the mirror assembly sheet 20 are adhered to each other by using an adhesive which is easily deformed even after curing, such as a silicone rubber-based adhesive. 48b is fixed to the mirror assembly sheet 20. Here, the pin 50 and the hole 52 are loosely fitted so that the second side wall portion 48b and the mirror assembly sheet 20 are not firmly connected to each other when they are fitted to each other. The pentamirror assembly 28 is prevented from falling off. The method for fixing the second side wall portion 48b to the mirror assembly sheet 20 is not limited to this, but if the two are firmly connected, a large force is applied to the mirror assembly body 32 by the connection, and the pentamirror assembly Since harmful distortion may occur on the mirror surface of the mirror 28, it is preferable to use a method of loosely fixing instead of firmly fixing.

The first side wall portion 48a of the mirror assembly body 32 is connected to the side wall portion of the mirror assembly sheet 20 via a position adjusting mechanism 54 for moving the position of the first side wall portion 48a right and left. . The position adjusting mechanism 54 is a screw mechanism including a male screw member 56 and a nut member 58. The male screw member 56 is connected to the first side wall portion 48.
The front end portion of the mirror assembly sheet 20a extends through a through hole 20b formed in the side wall portion of the mirror assembly sheet 20 and protrudes outward from the side wall portion of the mirror assembly sheet 20. The nut member 58 is screwed to a distal end portion of the male screw member 56 protruding from the through hole 20b, and is engaged with the outer surface of the side wall of the mirror assembly sheet 20.
As described above, the roof mirror 36 includes the first mirror surface 36a and the second mirror surface 36b, and the position adjusting mechanism 54 is provided outside the first wall portion 40a on which the first mirror surface 36a is formed. (An end remote from the second wall 40b) and an end outside the second wall 40b (on the side remote from the first wall 40a) where the second mirror surface 36b is formed. It is provided as distance adjusting means for adjusting the distance between the parts. That is, the distance can be adjusted by operating the position adjusting mechanism 54 to adjust and move the position of the first side wall portion 48a right and left.

However, the position adjusting mechanism 54 is applied when the interval between the left and right side walls 48a and 48b tends to be narrowed when the pentamirror assembly 28 is attached to the mirror assembly sheet 20. The narrowing of the interval between the side walls 48a and 48b means that
This means that the distance between the outer ends of the first wall portion 40a and the second wall portion 40b connected to the side wall portions is reduced, in which case the first mirror surface 36a and the second
When the roof angle, which is a relative angle between the mirror surface 36b and the mirror surface 36b, becomes narrower than the design value of 90 °, an overlap occurs at the center of the subject image in the viewfinder. In such a case, the nut member 58 is rotated and the male screw member 56 is rotated.
Is pulled out, the first side wall portion 48a moves rightward to elastically deform the mirror assembly body 32, thereby increasing the roof angle, so that the roof angle can be adjusted. In this sense, the position adjusting mechanism 54 causes the mirror mirror 36 to flex by bending the mirror assembly body 32.
This is nothing but a roof angle adjusting means for adjusting the roof angle. still,
The adjustment of the roof angle performed in this manner is performed by adjusting the roof angle by the pentamirror assembly 28 by the mirror assembly sheet 20.
Since the adjustment is performed to return the value to an accurate value before the lens is mounted on the mirror surface, the flatness of the mirror surfaces 36a and 36b is also corrected and improved in accordance with the adjustment of the roof angle. However, using the method of the present invention, it is also possible to correct a roof mirror already having an error in the roof angle at the time of manufacture.

In order to hold the penta-mirror assembly 28 on the mirror assembly sheet 20, if necessary, a part of the first side wall portion 48a and the mirror assembly sheet 20 are bonded together, for example, using a silicone rubber-based adhesive.
The adhesive may be adhered using an adhesive that is easily deformed even after curing. However, the bonding state must be gradual so that the first side wall portion 48a can be moved by operating the position adjusting mechanism 54.

The form of the position adjusting mechanism 54 is not limited to the above-described one, and may be configured in various other forms.
As specific examples, FIGS. 6A and 6B and FIGS. 7A and 7B show two different embodiments. These figures correspond to FIGS. 5A and 5B, and most of the members shown in those figures are shown in FIGS. 5A and 5B. The same or corresponding members are denoted by the same reference numerals, and description thereof is omitted.

The position adjusting mechanism 54 'shown in FIGS. 6A and 6B is different from the position adjusting mechanism 54 in that the screw position of the nut member 58 is set outside the side wall of the mirror assembly sheet 20. Instead, the nut member 5 is located between the pentamirror assembly 28 and the mirror assembly sheet 20.
8 is the same except that it engages with the inner surface of the side wall of the mirror assembly sheet 20.
The position adjusting mechanism 54 ′ is opposite to the case of the position adjusting mechanism 54 when the pentamirror assembly 28 is attached to the mirror assembly sheet 20.
This is applied when the interval of 48b tends to be widened. The widening of the distance between the side walls 48a, 48b means that the first wall 40a connected to them has a larger width.
And the distance between the outer ends of the second wall portion 40b is increased. In this case, since the roof angle is wider than the design value of 90 °, the central portion of the subject image in the viewfinder is enlarged. Defective part occurs in Therefore, in such a case, the nut member 58 is rotated to rotate the male screw member 56.
Is pushed inward, the first side wall portion 48a moves to the left to elastically deform the mirror assembly body 32, thereby narrowing the roof angle, so that the roof angle can be adjusted.

Incidentally, two nut members are screwed into the male screw member 56, and one of the nut members is attached to the mirror assembly sheet 20.
If you arrange the other one on the outside of the side wall part of,
When the penta-mirror assembly 28 is attached to the mirror assembly sheet 20, the gap between the left and right side walls 48a and 48b can be both reduced and expanded, and such a case is also included in the present invention. .

The position adjusting mechanism 54 "shown in FIGS. 7A and 7B has a very simple structure, and the position adjusting mechanism 54" is constituted by a simple spacer member 60. . In this case, spacer members having various thicknesses are prepared in advance, and a spacer member having an appropriate thickness is selected from them, and the first side wall portion 48 of the mirror assembly body 32 is selected.
a and the inner surface of the side wall of the mirror assembly sheet 20. As can be easily understood, this position adjusting mechanism 54 "also enables the position adjusting mechanism 54" of FIG.
Similarly to the position adjusting mechanism 54 'of (b), adjustment for narrowing the roof angle can be performed.

Although the specific embodiments of the present invention have been described above, the principles of the present invention can be implemented in various other forms. For example, for a single-lens reflex camera, it has a viewfinder mirror assembly that allows the subject image formed on the focusing screen to be observed from the viewfinder eyepiece, and the viewfinder mirror assembly has a shell-like elasticity with a roof mirror inside. The present invention can be applied to a single-lens reflex camera having a deformable plastic mirror assembly body, regardless of the specific configuration. That is,
In such a single-lens reflex camera, a first portion of the mirror assembly body is fixed to a mirror assembly mounting portion of the camera body, and a second portion of the mirror assembly body separated from the first portion is mounted on the mirror assembly. The mirror assembly body is configured to be movable and adjustable with respect to the mirror assembly body, and the mirror assembly body is flexed by moving the second portion of the mirror assembly body relative to the mirror assembly mounting portion to thereby reduce the roof angle of the roof mirror. Can be adjusted, thereby obtaining the effect of the present invention. Further, in such a single-lens reflex camera, there is provided a means for applying an external force to the mirror assembly body to bend,
The roof angle of the roof mirror can also be adjusted by applying an external force to the mirror assembly body to bend, thereby obtaining the effect of the present invention. The single-lens reflex camera 1 according to the embodiment of the present invention disclosed above.
0 is the first side wall 4 of the mirror assembly body 32
8a is relatively moved with respect to the mirror assembly sheet 20, and at the time of movement, the external force is applied to the mirror assembly body 32 so that the mirror assembly body 32 bends. Corresponds to any of the above two methods.

The present invention can be applied to other types of single-lens reflex cameras, can be applied to cameras other than single-lens reflex cameras, and can also be applied to a wide variety of optical devices in general. It is. For example, in an optical device using a mirror assembly configured by combining a plurality of mirror surfaces, the mirror assembly can be adjusted using the present invention. In this case, first, the mirror assembly is formed by providing mirror surfaces at a plurality of locations on the surface of an elastically deformable plastic mirror assembly body. Then, a first portion of the mirror assembly body is fixed to the optical device, and a second portion of the mirror assembly body, which is separated from the first portion, is configured to be movable with respect to the optical device. Further, the second position of the mirror assembly body may be moved relative to the optical device to bend the mirror assembly body to adjust the relative positions or angles of the plurality of mirror surfaces. Thereby, the effect of the present invention can be obtained. Alternatively, in such a case, the mirror assembly is formed by providing mirror surfaces at a plurality of positions on the surface of a mirror assembly body made of an elastically deformable plastic, and then the mirror assembly body is bent by applying an external force. By doing so, the relative positions or relative angles of the plurality of mirror surfaces may be adjusted, and the effect of the present invention can be obtained. It is apparent that the single-lens reflex camera 10 according to the embodiment of the present invention described above corresponds to the configuration of these optical devices.

In the embodiment of the present invention described above, the mirror surface is provided on the mirror assembly body.
Although a method of depositing metal on the surface of the mirror assembly body has been used, a method of providing a mirror surface is not limited to this. For example, a mirror member formed by evaporating a metal on a glass plate may be bonded to the mirror assembly body using an adhesive that easily deforms even after curing, such as a silicone rubber-based adhesive. Are included in the present invention.

[0031]

As is apparent from the above description, according to the present invention, a mirror assembly having a combination of a plurality of mirror surfaces, such as a single-lens reflex camera using a finder mirror assembly having a roof mirror, is provided. In the optical apparatus used, the mirror assembly is formed by providing mirror surfaces at a plurality of positions on the surface of an elastically deformable plastic mirror assembly body, and the plurality of mirror surfaces are formed by bending the mirror assembly body. The relative position or relative angle of is adjusted. Therefore, when distortion has occurred in the mirror assembly after the mirror assembly has been attached to the optical device, the distortion can be easily corrected. This is a great advantage when the mirror assembly is likely to be distorted at the time of mounting, such as a finder mirror assembly of a single-lens reflex camera.

[Brief description of the drawings]

FIG. 1 is a sectional side view of a single-lens reflex camera according to an embodiment of the present invention.

FIG. 2 is a right side view of a finder mirror assembly and a mirror assembly sheet used in the single-lens reflex camera of FIG. 1;

FIG. 3 is a front view of a finder mirror assembly and a mirror assembly sheet.

FIG. 4 is a left side view of the finder mirror assembly.

FIGS. 5A and 5B are a plan view and a sectional front view of a finder mirror assembly and a mirror assembly sheet, respectively.

FIGS. 6A and 6B are a plan view and a sectional front view of a finder mirror assembly and a mirror assembly sheet having a position adjusting mechanism of another specific example.

FIGS. 7A and 7B are a plan view and a sectional front view of a finder mirror assembly and a mirror assembly sheet provided with a position adjusting mechanism of still another specific example.

[Explanation of symbols]

Reference Signs List 10 single-lens reflex camera 20 mirror assembly sheet 24 focusing plate 28 finder mirror assembly (pentamirror assembly) 30 finder eyepiece 32 mirror assembly body 36 roof mirror 38 plane mirror 54, 54 ', 54 "position adjusting mechanism

Claims (11)

[Claims] 1. A single-lens reflex camera, comprising: a finder mirror assembly for enabling a subject image formed on a reticle to be observed from a finder eyepiece of an eye-level finder as upper, lower, left, and right normal images; Is a shell-shaped elastically deformable inner side provided with a roof mirror for reflecting light incident from the focusing plate and a plane mirror for further reflecting the light reflected by the roof mirror and guiding the light to the finder eyepiece. A single-lens reflex camera comprising: a plastic mirror assembly body; and a roof angle adjusting means for adjusting a roof angle of the roof mirror by bending the mirror assembly body. 2. The roof mirror according to claim 1, wherein the first mirror surface is provided inside a first wall portion and a second wall portion connected at a right angle to each other and defining a part of the mirror assembly body, and the first mirror surface is abutted at right angles to each other. And a second mirror surface, wherein the roof angle adjusting means is configured such that an end of the first wall portion on a side away from the second wall portion and a first wall portion of the second wall portion. 2. The single-lens reflex camera according to claim 1, further comprising a distance adjusting means for adjusting a distance between the remote end and the remote end. 3. The reticle, wherein the reticle extends horizontally, the finder mirror assembly is disposed above the reticle, and the mirror assembly body comprises the first wall and the second wall. And a peripheral wall connected to the top wall, the peripheral wall being formed in a shell shape, the peripheral wall being provided with a front wall provided with the flat mirror inside and the finder contacting. A rear wall having an opening facing the eye, and left and right side walls extending in the front-rear direction; the first wall and the second wall being arranged side by side; A right end of the wall is connected to the right side wall, a left end of the second wall is connected to the left side wall, and one of the left and right side walls of the mirror assembly body is a camera body. The other is fixed to the mirror assembly mounting portion and the other is the mirror assembly 3. The apparatus according to claim 2, wherein the distance adjusting means is configured to be capable of adjusting and moving the position of the other side wall of the mirror assembly body to the left and right with respect to the mounting part. Single-lens reflex camera. 4. The single-lens reflex camera according to claim 3, wherein the position adjusting mechanism is a screw mechanism interposed between the other side wall of the mirror assembly body and the mirror assembly mounting portion. 5. The mirror according to claim 3, wherein the position adjusting mechanism is a spacer member interposed between the other side wall of the mirror assembly body and the mirror assembly mounting portion.
The described single-lens reflex camera. 6. The mirror assembly body according to claim 3, wherein the one side wall portion of the mirror assembly body and the mirror assembly mounting portion are engaged with each other via a locking structure for preventing relative movement in the horizontal direction. The single-lens reflex camera according to any one of the preceding claims. 7. The mirror assembly body according to claim 1, wherein the left and right side walls of the mirror assembly body are bonded to the mirror assembly mounting portion using an adhesive that is easily deformed even after curing. Single-lens reflex camera. 8. A single-lens reflex camera, comprising: a finder mirror assembly for enabling a subject image formed on a reticle to be observed from a finder eyepiece; wherein the finder mirror assembly includes a shell having a roof mirror provided inside. An elastically deformable plastic mirror assembly body, wherein a first portion of the mirror assembly body is fixed to a mirror assembly mounting portion of a camera body, and is separated from the first portion of the mirror assembly body. A second portion is configured to be movable relative to the mirror assembly mounting portion, and the second portion of the mirror assembly body is relatively moved with respect to the mirror assembly mounting portion to bend the mirror assembly body. This makes it possible to adjust the roof angle of the roof mirror. A single-lens reflex camera to be a sign. 9. A single-lens reflex camera, comprising: a finder mirror assembly for allowing a subject image formed on a reticle to be observed from a finder eyepiece; wherein the finder mirror assembly has a shell provided with a roof mirror inside. A mirror assembly body made of an elastically deformable plastic having a shape, comprising: means for applying an external force to the mirror assembly body to bend; and applying an external force to the mirror assembly body to bend the roof angle of the roof mirror. Adjustable, single-lens reflex camera characterized by the following. 10. A method of adjusting a mirror assembly in an optical apparatus using a mirror assembly configured by combining a plurality of mirror surfaces, wherein the mirror assembly is provided at a plurality of positions on a surface of an elastically deformable plastic mirror assembly body. A mirror surface is formed, a first portion of the mirror assembly body is fixed to the optical device, and a second portion of the mirror assembly body separated from the first portion is moved and adjusted with respect to the optical device. The second position of the mirror assembly body is relatively moved with respect to the optical device to bend the mirror assembly body, thereby adjusting a relative position or a relative angle of the plurality of mirror surfaces. A method for adjusting a mirror assembly, characterized in that: 11. A method for adjusting a mirror assembly in an optical apparatus using a mirror assembly configured by combining a plurality of mirror surfaces, wherein the mirror assembly is provided at a plurality of positions on a surface of an elastically deformable plastic mirror assembly body. A method of adjusting a mirror assembly, wherein the mirror assembly body is formed by providing a mirror surface, and a relative position or a relative angle of the plurality of mirror surfaces is adjusted by applying an external force to the mirror assembly body to bend. .