JPH10293347A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the leakage of light incident from a front side without causing any change in the focal plane size of a film by laying a shading means at the adjacent part of a camera body and a plate for preventing the leakage of light to a film passage. SOLUTION: One end of film passage 30e is formed at a position faced to a film tunnel, using the member 60d of a camera body 60 and the member 61a of a cartridge chamber cover member 61. Also, visors 30d are provided at both ends of a shutter cover plate 30, so as to protect a film against exposure to light incident from a front via a gap or the like between a mirror body 70 and a front cover 170. Furthermore, the members 60d and 60c of the camera body 60 are extended and superposed on the visors 30d, so as to form a wall, thereby preventing the leakage of light at the end of the film passage 30e. In other words, the visors 30d are made larger than the height of the film passage 30e, and superposed on the camera body 60 to form a wall, and the leakage of light at the film passage 30e is thereby prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having a focal plane shutter.

[0002]

2. Description of the Related Art The structure of a conventional camera body and a focal plane shutter is shown in FIG. The shutter substrate 1 has an aperture 1a. The shutter mechanism 2 is a mechanism that implements a shutter function. The cover plate 3 has an aperture 3a. A front curtain group 4 and a rear curtain group 5 are arranged between the shutter substrate 1 and the cover plate 3. A shutter unit is composed of the shutter substrate 1 to the rear curtain group 5 described above.

[0005] The camera body 6 has an aperture 6a for defining a shooting screen. At the time of photographing, the position of the film (not shown) with respect to the aperture 6a in the vertical direction (the direction perpendicular to the film advancing direction) is defined by two outer rails 6c provided on the camera body 6. In addition, by being accommodated in a tunnel formed by a step between the inner rail 6b and the outer rail 6c, the position in the optical axis direction is defined. A film cartridge is housed in the film cartridge chamber 6d. A spool for film winding is housed in the spool chamber 6e.

FIG. 9 is a vertical sectional view of a conventional single-lens reflex camera with interchangeable lenses. The mirror box 7 houses a mirror for the finder optical system, and is fixed to the body 6 by screws 9a and 9b. Bayonet mount 8
Has an interchangeable lens mounting reference surface 8a, and is fixed to the mirror box 7 by screws 9c. Shutter substrate 1
(FIG. 8) and the shutter cover plate 3 (FIG. 8) are disposed between the mirror box 7 and the camera body 6, and are fixed to the mirror box 7 or the camera body 6.

[0005]

The focal plane of the camera is secured by controlling the distance (railback dimension) from the bayonet mount reference plane 8a (FIG. 9) to the inner rail 6b and the outer rail 6c. I have. This distance is formed by stacking the thickness of the bayonet mount 8, the dimensions from the bayonet mount mounting surface of the mirror box 7 to the body mounting surface, and the dimensions from the mirror box mounting surface of the body 6 to the inner rail and the outer rail. ing. When these parts are molded from plastic, high-precision dimensional control is possible with the parts alone, but deformation will occur by attaching other parts such as the exterior cover. It was difficult.

For this reason, conventionally, after the assembly is completed, the inner rail and the outer rail are cut out by mechanical pressure with reference to the bayonet mount surface to control the rail back dimension. This step causes a cost increase. Also, since a large external force is applied to the camera body 6 by attaching a grip, a tripod seat, a suspension ring, and the like,
Despite the rail processing, there has been a problem that the body 6 is deformed by the influence of external force and the rail back is disturbed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and secures a film focal plane dimension without rail processing, so that the film focal plane dimension changes even when the camera body receives a large external force. The purpose of the present invention is to obtain a configuration that does not have light and to prevent light from leaking from the front.

[0008]

According to the first aspect of the present invention, there is provided a film passage having a film cartridge chamber and a film winding chamber, and communicating with the film cartridge chamber and the film winding chamber. (30e)
A camera body (60, 100) having a member (100) forming a part of the camera body (60, 100), and a plate (10) disposed closer to the subject than the film path (30e) and provided adjacent to the camera body (60, 100). Or 30), camera body (60, 100) and plate (10 or 3)
0), and a light shielding means (30d, 10b) for preventing light from leaking to the film path (30e).

According to the second aspect of the present invention, the light shielding means (30
d, 10b) is in the shape of an eaves.

According to a third aspect of the present invention, the light shielding means is a plate-like member (190) having an overlapping portion between the camera body and the plate.

According to a fourth aspect of the present invention, the light shielding means is an elastic member.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 4 are perspective views showing a first embodiment of a camera according to the present invention.

In FIG. 1, an aperture 10a is provided on a shutter substrate 10. Shutter mechanism 2
0 is set on the shutter substrate 10. The shutter cover plate 30 has an aperture 30a, is disposed opposite to the shutter substrate 10, and forms a shutter blade chamber 10c with the shutter substrate 10. When the aperture 10a and the aperture 30a are compared, the aperture 30a
a is set smaller, and the shooting screen is defined by the aperture 30a. In the shutter blade chamber 10c, blade groups 40 and 50 each including a plurality of light-shielding thin plates are stored. The blade groups 40 and 50 are driven by the shutter mechanism 20, and the aperture 30a
Open / close operation. The fastening of the shutter substrate 10 and the shutter cover plate 30 is performed at a position outside the movable range of the blade groups 40 and 50.

On the back surface (left side in FIG. 1) of the shutter cover plate 30, a rear plate 100 of the film tunnel is arranged. The rear plate 100 of the film tunnel is attached to the shutter cover plate 30 in a state of being in close contact with the surface 30b. The shutter cover plate 30 is provided with two in-film rails 30c formed in a groove shape on the surface 30b, and a film passage 30e is formed between the rear plate 100 of the film tunnel and the in-film rail 30c. . The fastening of the shutter cover plate 30 and the rear plate 100 of the film tunnel is performed by the
This is a position avoiding the film path 30e. The camera body 60 is provided with a film cartridge chamber 60d and a film winding chamber 60e. Note that the film passage 30e will be described in detail when describing FIG.

According to the above configuration, the thickness of the shutter cover plate 30 can be increased without changing the shutter efficiency from the conventional one, so that the rigidity of the shutter blade chamber 10c increases,
Even if the shutter substrate 10 is molded of plastic or the shutter charging force is large in a high-speed shutter,
The deformation of the shutter blade chamber 10c is reduced as compared with the related art, and accurate shutter time can be realized. If the rear plate 100 of the film tunnel is fixed to the shutter cover plate 30, the rigidity of the shutter cover plate 30 can be further increased. In this case, the thickness of the shutter cover plate 30 can be reduced, the distance between the film surface and the shutter blades can be made shorter than before, and the shutter efficiency can be increased. Furthermore, if the shutter cover plate 30 is made of plastic, a wall that shields the periphery of the blade chamber and a drive shaft that supports the shutter blade group can be integrally formed, so that the cost can be reduced.

In FIG. 2, the shutter cover plate 30 is fixed to the shutter substrate 10 by screws 90a, and the rear tunnel plate 100 is fixed to the shutter cover plate 30 by screws 90b to form a shutter unit including a film tunnel. Eaves 30d are provided at both ends of the shutter cover plate 30 so that light from the front enters the film passage 30e and does not leak to the film (see FIG. 4 described later). Reference numeral 70 denotes a mirror box for storing a mirror for a finder optical system. The mirror box 70 includes a bayonet mount mounting seat 70 a having a mounting reference surface for the interchangeable lens, and a mounting seat 7 for the film tunnel rear plate 100.
0b, a mounting box 70c for a prism box having a screen for observing a photographed image and a pentaprism, and a mounting hole 70d for a rotation shaft of a mirror for a finder optical system.

The rear panel 100 of the film tunnel has a mounting seat 100a for the mirror box 70, and is fixed to the mirror box 70 by screws 90c. That is, the film tunnel is configured as a unit in a mirror box. The mirror box 70 is fixed to the camera body 60 by screws 90d and 90e.

FIG. 3 is a vertical sectional view showing the structure of the first embodiment of the present invention. The bayonet mount 80 has an interchangeable lens attachment reference surface 80a, and is fixed to the mirror box 70 with screws 90f. Prism box 11
Numeral 0 includes a screen 111 for photographed image observation and a pentaprism 112, and is fixed to a mounting seat 70c (FIG. 2) provided on the mirror box 70. The mirror 120 for the finder optical system is rotatable about a hole 120a, and the hole 120a is provided in a hole 70d provided in the mirror box 70.
It is supported by the mirror box 70 so as to be coaxial with (FIG. 2). The photographic film (not shown) is housed in a tunnel formed between the in-film rail 30c provided on the shutter cover plate 30 and the rear plate 100 of the film tunnel, and is placed in the optical axis direction (horizontal direction in FIG. 3). The position of is specified.

In this embodiment, the rail back dimension, which is the distance from the lens mounting reference plane to the in-film rail 30c, is the dimension from the lens mounting surface 80a of the bayonet mount 80 to the mounting surface with the mirror box 70, and the mirror. The dimensions from the bayonet mount mounting surface 70a of the box 70 to the film tunnel rear plate mounting surface 70b, and the dimensions from the mirror box mounting surface 100a of the film tunnel rear plate 100 to the in-film rail 30c, ie, after the film tunnel on the shutter cover plate 30 It is constituted by the accumulation of the dimensions from the plate mounting surface 30b to the in-film rail 30c. Therefore,
There is no concern that the film rail surface will be deformed due to the attachment of other components such as the exterior cover, and if the bayonet mount 80, mirror box 70, and shutter cover plate 30 are dimensionally controlled with high precision, the railback dimensions can be secured without secondary processing. be able to. Also, even if a large external force is applied to the camera body 60 from the grip, tripod mount, suspension ring, or the like,
The film surface near the photographing screen is separated from the camera body 60, and the railback dimension does not change. In addition, the camera body 60 may have a lower rigidity than before, and in order to increase the strength, the camera body conventionally formed of metal inserts may be formed of only plastic, or the body thickness may be reduced. It is also possible to reduce the size and weight of the body.

FIG. 4 is a horizontal sectional view showing the structure of the first embodiment of the present invention. The cartridge chamber cover member 61 is connected to the film cartridge chamber 6 provided in the camera body 60.
0d covers the rear side in the optical axis direction. Camera body 60
60b provided in the cartridge and the cartridge chamber cover member 6
One end of the film passage 30e is formed at a position facing the film tunnel by the member 61a provided in the first member. The film cartridge 130 includes a film 131.
Is stored. The take-up chamber cover member 62 covers the rear side in the optical axis direction of the film take-up chamber 60e provided in the camera body 60. A member 60c provided on the camera body 60 and a member 62a provided on the winding chamber cover member 62
Thus, the other end of the film passage 30e is formed at a position facing the film tunnel.

Here, the film passage 30e is a member 6
1a and the cartridge chamber entrance (one end of the film passage) formed by the member 60b, the member 62a and the member 60c
, And a part of the film passage formed by the member 100 and the member 30.

A film take-up spool 140, film rollers 141 and 142 are provided in the film take-up chamber 60e.
Is installed. The film sent from the film cartridge 130 passes through the film path 30e formed by the members 60b and 61a, and passes through the film tunnel formed by the shutter cover plate 30 and the rear plate 100 of the film tunnel, and the members 60c and 62c.
a into the film take-up chamber 60e through the film path 30e formed by the film take-up spool 140a.
The operation of loading the film into the camera is completed. That is, the film is held by the camera body unit in the cartridge chamber 60d and the winding chamber 60e, and is held in the mirror box unit near the exposure screen. Two single-cell type lithium batteries 180 are housed in the battery chamber 60f. A front cover 170 and a rear cover 160 cover the camera body 60 from the front side or the rear side, respectively.

Eaves 30d are provided at both ends of the shutter cover plate 30 so that light from the front such as a gap between the mirror box 70 and the front cover 170 does not leak to the film. Further, the members 60b and 60c of the camera body are extended and overlapped with the eaves 30d to form a wall to prevent light leakage at the end of the film passage 30e. That is, as shown in FIG. 5, members 60b and 60
If the eaves 30d are not formed by extending c, the member 60
In one film passage 30e formed by the member b and the member 61a, and in the other film passage 30e formed by the member 60c and the member 62a, light from the front (subject side) may leak to the film. is there. Therefore, the eaves 30d are made larger than the height of the film passage 30e, and are overlapped with the camera body to form a wall to prevent light leakage in the film passage 30e.

FIG. 6 is a horizontal sectional view showing a second embodiment of the present invention. In this embodiment, at both ends of the shutter substrate,
An eave 10b for preventing light leakage from the front is provided. Note that the eaves 10b are different from the first embodiment shown in FIG. 4 in that the position is formed forward (toward the subject).
The configuration of the other parts is common to the first embodiment.

FIG. 7 is a horizontal sectional view showing a third embodiment of the present invention. In this embodiment, light leakage is prevented by covering the gap between the shutter cover plate 30 and the side surfaces of the camera body members 60b and 60c with a maltprene 190.

In the configuration of the embodiment described above, the rail back dimension is the thickness dimension of the bayonet mount 80, the dimension from the bayonet mount mounting surface 70a of the mirror box 70 to the shutter cover plate mounting surface 70b, the shutter cover plate 30 Is determined by the accumulation of the dimensions from the film tunnel rear plate mounting surface 30b to the in-film rail 30c in FIG. Therefore, by managing the dimensions of each part, it is possible to secure the rail back dimensions without secondary processing.

Further, since the shutter cover plate 30 is separated from the camera body 60, even if an external force is applied to the camera body 60 from a grip, a tripod seat, a suspension ring or the like, the railback dimension does not change.

Further, according to the structure of each embodiment, the rear plate 100 of the film tunnel is installed on the camera body 60 side, and both members 30b of the shutter cover plate 30 are provided with a spring property.
The same effect as described above can be obtained by forming a film tunnel in close contact with the film.

[0030]

As described above, according to the camera of the present invention, the film passage (30) is disposed adjacent to the camera body (60, 100) and the plate (10 or 30).
e) The light shielding means (30d, 10b) for preventing light leakage to the e) secures the film focal plane dimension without rail processing, and changes the film focal plane dimension even when the camera body receives a large external force. It is possible to obtain a configuration that does not have light and to prevent leakage of light from the front.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a camera according to the present invention.

FIG. 2 is a perspective view showing a first embodiment of the camera according to the present invention.

FIG. 3 is a longitudinal sectional view showing a first embodiment of the camera according to the present invention.

FIG. 4 is a cross-sectional view showing a first embodiment of the camera according to the present invention.

FIG. 5 is a cross-sectional view illustrating an example of a camera.

FIG. 6 is a cross-sectional view showing a second embodiment of the camera according to the present invention.

FIG. 7 is a cross-sectional view showing a third embodiment of the camera according to the present invention.

FIG. 8 is a perspective view showing an example of a conventional camera.

FIG. 9 is a longitudinal sectional view showing an example of a conventional camera.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Shutter board 30 Shutter cover plate 30d Mirror box attachment seat 30e Film passage 60 Camera body 70 Mirror box 80 Bayonet mount 100 Rear plate of film tunnel

Claims (4)

[Claims] A camera body having a film cartridge chamber and a film take-up chamber, and having a member forming a part of a film passage leading to the film cartridge chamber and the film take-up chamber; A plate disposed on the side and provided adjacent to the camera body; and a light blocking means disposed at an adjacent portion between the camera body and the plate and preventing light from leaking into the film path. . 2. The camera according to claim 1, wherein said light shielding means has an eaves shape. 3. The camera according to claim 1, wherein said light shielding means is a plate-like member having an overlapping portion between said camera body and said plate. 4. The camera according to claim 1, wherein said light shielding means is an elastic member.