JPH09203964A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a film focal surface from being displaced by separating a camera subbody having a regulating member regulating the film focal surface from a camera body. SOLUTION: A shutter cover plate 30 is fixed at a shutter substrate 10 by a machine screw 90a, and a tunnel rear plate 100 is fixed at the shutter cover plate 30 by a machine screw 90b so that a shutter unit including a film tunnel is formed. Photographing film is housed at a tunnel part formed between a rail at the inside of film provided at the shutter cover plate 30 and the film tunnel rear plate 100, and a position in the direction of an optical axis is regulated. Thus, when dimensions of a bayonet, a mirror box 70 and the shutter cover plate 30 are highly accurately controlled, a rail back dimension is secured without secondary working. When external force is added to the camera body 60, the rail back dimension is not changed because a film surface is separated from the camera body 60.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art The structure of a conventional camera body and a focal plane shutter unit is shown in FIG. Reference numeral 1 denotes a shutter substrate 1 having an aperture 1a. Reference numeral 2 is a shutter mechanism section. A 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. The shutter substrate 1,
The shutter mechanism unit 2, the cover plate 3, the front curtain group 4, and the rear curtain group 5 constitute a shutter unit. A camera body 6 has an aperture 6a that defines a shooting screen. At the time of shooting, the film is defined by the two film outer rails 6b provided on the camera body 6 with respect to the position with respect to the aperture 6a in the up-and-down direction of the camera which is a direction orthogonal to the film advancing direction. Further, the film includes a rail 6c inside the film and a rail 6b outside the film.
The position in the optical axis direction is defined by being housed in the tunnel formed by the step of the. Further, 6d is a film cartridge chamber, and 6e is a spool chamber for winding the film.

FIG. 7 is a vertical sectional view of a conventional interchangeable lens type single-lens reflex camera. Reference numeral 7 is a mirror box that houses a mirror for the finder optical system, and includes screws 9a and 9a.
It is fixed to the body 6 by b. Reference numeral 8 denotes a bayonet having a mounting reference surface 8a for an interchangeable lens, and a screw 9
It is fixed to the mirror box 7 by c. The blade chamber formed by the shutter substrate 1 and the shutter cover plate 3 is arranged between the mirror box 7 and the camera body 6 and fixed to the mirror box 7 or the camera body 6.

[0004]

In the above structure, the focal plane of the camera is ensured by controlling the distance (railback dimension) from the bayonet reference plane 8a to the film inner rail 6b and the film outer rail 6c. . This distance is formed by stacking the thickness dimension of the bayonet 8, the dimension from the bayonet mounting surface of the mirror box 7 to the body mounting surface, and the dimension from the mirror box mounting surface of the body 6 to the inner rail and the outer rail. When these parts are molded with plastic, it is possible to perform highly accurate dimensional control with the single part, but deformation occurs when other parts such as the exterior cover are attached.
It was difficult to obtain a satisfactory railback size. For this reason, conventionally, after the assembly is completed, the railback dimension is controlled by machining the inner rail and the outer rail by machining based on the bayonet surface, but this step causes a cost increase. Also, the camera body 6 has a grip,
Since a large external force is applied by attaching a tripod seat, a suspension ring, etc., there is a problem that the body 6 is deformed by the influence of the external force and the railback is deformed despite the rail processing.

Therefore, an object of the present invention is to secure a film focal plane size without rail processing and to achieve a structure in which the film focal plane size does not change even when a large external force is applied to the camera body.

[0006]

To achieve the above object, the present invention comprises a camera body having a film cartridge chamber and a film winding chamber, and a unit separate from the camera body. It is configured to have an aperture that is arranged between the film winding chamber and defines an exposure screen, and a camera subbody that is provided in the vicinity of the aperture and that includes a defining member that defines a film focal plane.

Further, the camera sub body has a cover portion covering the regulation member with a gap through which a film can pass, and a film entrance / exit opening leading to the film cartridge chamber and the film winding chamber at both ends in the film passing direction. It has a structure having.

[0008]

Since the camera sub-body having the defining member that defines the film focal plane is separated from the camera body, even if a large external force is applied to the camera body, the defining member does not deform and the film focal plane does not shift. Since the cover portion that covers the regulation member is also unitized as a part of the camera sub body, the assembling efficiency is good.

[0009]

1 and 2 are perspective views showing the configuration of a first embodiment of the present invention. In FIG. 1, reference numeral 10 denotes a shutter substrate, which is provided with an aperture 10a. Reference numeral 20 denotes a shutter mechanism section installed on the shutter substrate 10. Reference numeral 30 denotes a shutter cover plate having an aperture 30a, which is arranged facing the shutter substrate 10 and forms a shutter blade chamber with the shutter substrate 10. The aperture 30a is set smaller in the aperture 10a and the aperture 30a, and the photographing screen is defined by the aperture 30a. In this shutter blade chamber, a blade group 40, 5 composed of a plurality of light-shielding thin plates is provided.
0 is stored, and the blade groups 40 and 50 are the shutter mechanism unit 20.
The opening and closing operation of the aperture 30a is performed. The shutter substrate 10 and the shutter cover plate 30 are fastened to each other at a position avoiding the movable range of the blade groups 40 and 50. A film tunnel rear plate (cover portion) 1 is provided at a position facing the surface of the shutter cover plate 30 opposite to the blade chamber.
00 is arranged and is attached in close contact with the surface 30b of the shutter cover plate. Shutter cover plate 30
Is provided with two in-film rails (regulating members) 30c set to a height lower than the surface 30b, and a film passage path is formed in a space between the film tunnel rear plate 100 and the in-film rails 30c. It is formed. The fastening between the shutter cover plate 30 and the film tunnel rear plate 100 is performed on the surface 30b, which is a position avoiding the film passage path. A camera body 60 is provided with a film cartridge chamber 60d and a film winding chamber 60e.

According to the above construction, the thickness of the shutter cover plate can be increased without changing the shutter efficiency as compared with the conventional one, so that the rigidity of the shutter blade chamber is increased and the shutter substrate 10 is molded with plastic or the high speed shutter is used. Even when the amount of shutter charge is large, the deformation of the blade chamber is reduced as compared with the conventional case, and accurate shutter time can be realized. Further, if the film tunnel rear plate 100 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. Also, the shutter cover plate 30
If is made of plastic, the wall that shields the periphery of the blade chamber and the drive shaft that supports the shutter blade group can be integrally formed, and the cost can be reduced.

In FIG. 2, the shutter cover plate 30 is fixed to the shutter substrate 10 with screws 90a, and the tunnel rear plate 100 is fixed to the shutter cover plate 30 with screws 90b to form a shutter unit including a film tunnel. Reference numeral 70 denotes a mirror box for storing a mirror for a finder optical system. Mirror box 70
Is a bayonet mounting seat 70a having an interchangeable lens mounting reference surface, a mounting seat 70b of the film tunnel rear plate 100, a prism box mounting seat 70c equipped with a screen for photographic image observation and a pentaprism, and a mirror for a finder optical system. The rotary shaft mounting hole 70d is provided. The film tunnel rear plate 100 includes a mounting seat 100a for mounting the mirror box 70, and is fixed to the mirror box 70 with screws 90c. That is, the film tunnel is configured as a unit in a mirror box. The mirror box 70 has screws 90d and 90
It is fixed to the camera body 60 by e.

FIG. 3 is a vertical sectional view showing the structure of the first embodiment of the present invention. 80 is an interchangeable lens mounting reference surface 8
It is a bayonet having 0a and is fixed to the mirror box 70 by screws 90f. Reference numeral 110 denotes a prism box which includes a screen 111 for observing a captured image and a pentaprism 112, and is fixed to a mounting seat 70c provided on the mirror box 70. Reference numeral 120 denotes a finder optical system mirror, which is rotatable around a hole 120a, and the hole 120a is a hole 7 provided in the mirror box.
It is supported by the mirror box 70 so as to be coaxial with 0d. The photographic film includes a rail 30c inside the film provided on the shutter cover plate 30 and a rear plate 1 of the film tunnel.
It is housed in a tunnel portion formed between the optical disc and the optical disc, and its position in the optical axis direction is defined. In the configuration of this embodiment,
The rail-back dimension, which is the distance from the lens mounting reference surface to the rail in the film, is the dimension from the lens mounting surface 80a of the bayonet 80 to the mounting surface of the mirror box 70, and the bayonet mounting surface 70a of the mirror box 70 to the rear of the film tunnel. Dimensions up to the plate mounting surface 70b and the film tunnel rear plate 10
0 from the mirror box mounting surface 100a to the rail 30c in the film, that is, the shutter cover plate 3
It is configured by accumulating dimensions from the film tunnel rear plate mounting surface 100 to the film inner rail 30c at 0.

According to the above construction, there is no concern that the film rail surface will be deformed by the attachment of other parts such as the exterior cover. If the dimension control of the bayonet 80, the mirror box 70 and the shutter cover plate 30 is performed with high accuracy, the secondary processing is performed. The railback dimensions can be ensured without. Further, even if a large external force is applied to the camera body 60 from the grip, tripod mount, suspension ring, etc., the film surface near the shooting screen is separated from the camera body 60, and the railback dimension does not change. Not only that, the rigidity of the camera body 60 may be lower than that of the conventional one. For improving the strength, the camera body formed of the metal insert 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. Reference numeral 61 denotes a cartridge chamber cover member that covers the rear side of the film cartridge chamber 60d provided in the camera body 60 in the optical axis direction, and includes a portion 60b provided in the camera body 60 and a portion 61a provided in the cartridge chamber cover member. Thus, a film entrance / exit is formed at a position facing the film tunnel. 130 is a film cartridge. 62 is a camera body 60
Is a winding chamber cover member that covers the rear side in the optical axis direction of the film winding chamber 60e provided in the camera body 60, and includes a 60c portion provided in the camera body 60 and a 62a portion provided in the winding chamber cover member 62. A film entrance / exit is formed at a position facing the film tunnel. The film take-up spool 60 is provided in the film take-up chamber 60e.
0, film rollers 141 and 142 are installed. The film sent from the film cartridge 130 passes through the film entrance and exit formed by 60b and 61a, passes through the film tunnel formed by the shutter cover plate 30 and the film tunnel rear plate 100, and
0c, through the film entrance and exit formed by 62a,
The film enters the film take-up chamber 60e and is taken up by the film take-up spool 140, and 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.

FIG. 5 is a perspective view showing a second embodiment of the present invention. In this embodiment, a shutter cover plate 30 that also serves as a film rail plate is provided with a mounting surface 30d for mounting the mirror box 70. The configuration of other parts is the same as that of the first embodiment. In the above configuration, the railback dimensions are
The thickness of the bayonet 80, the dimension from the bayonet mounting surface 70a to the shutter cover plate mounting surface 70d of the mirror box 70, and the dimension from the mirror box mounting seat 30d to the in-film rail 30c of the shutter cover plate 30 are accumulated. Since the shutter cover plate 30 does not have a risk of being deformed due to the attachment of other components such as an external cover, the dimension of each component can be managed to secure the railback dimension without secondary processing. The shutter cover plate 30 is a camera body 60.
Since it is separated from the grip, the camera body 60 has a grip,
Even if external force is applied from the tripod mount, suspension ring, etc., the railback dimensions will not change. Further, according to the configuration of this embodiment, the film tunnel rear plate 100 is installed on the camera body 60 side, and the surface 3 of the shutter cover plate 30 is provided with a spring property.
The same effect as described above can be obtained by forming a film tunnel by bringing the film tunnel into close contact with 0b. The film rail plate part that was conventionally provided on the camera body was separated from the camera body, and this film rail plate part was unitized on the mirror box side. No worries,
By managing the dimensions of related parts, it is possible to secure the rail-back dimension, and the rail surface processing process after camera assembly is completed can be eliminated, and a significant cost reduction can be expected.

Further, since the film tunnel is separated from the camera body, even if a large external force is applied to the body from the grip portion, tripod seat, suspension ring, etc., the film rail surface is not deformed and a stable railback dimension can be obtained. You can

[0017]

As described above, according to the present invention, since the camera sub-body having the defining member that defines the film focal plane is separated from the camera body, the defining member is deformed even when a large external force is applied to the camera body. The film focal plane does not shift.

Since the cover portion for covering the regulating member is also unitized as a part of the camera sub body, the assembling efficiency is good.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a first embodiment of the present invention.

FIG. 2 is a perspective view showing the configuration of the first embodiment of the present invention.

FIG. 3 is a vertical sectional view showing the configuration of the first embodiment of the present invention.

FIG. 4 is a horizontal sectional view showing the configuration of the first embodiment of the present invention.

FIG. 5 is a perspective view showing a configuration of a second embodiment of the present invention.

FIG. 6 is a perspective view showing a conventional example.

FIG. 7 is a vertical sectional view showing a conventional example.

[Explanation of symbols]

 10 Shutter Substrate 30 Shutter Cover Plate 60 Camera Body 70 Mirror Box 80 Bayonet Mount 100 Film Tunnel Rear Plate

Claims (3)

[Claims] 1. A camera body having a film cartridge chamber and a film take-up chamber, and a unit separate from the camera body, which is arranged between the film cartridge chamber and the film take-up chamber and displays an exposure screen. A camera comprising: a defining aperture, and a camera sub-body provided near the aperture and having a defining member that defines a film focal plane. 2. The camera sub-body has, on the defining member, a cover portion that covers a space through which a film can pass, and a film that communicates with the film cartridge chamber and the film take-up chamber at both ends in the film passing direction. The camera according to claim 1, further comprising a doorway. 3. The camera according to claim 1, wherein the camera sub-body has a photographing lens attachment reference portion.