JP2003207830A - Camera body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the dimensional variation of a front body and a rear body due to the molding, and to attain the accurate dimensions in connecting both bodies. <P>SOLUTION: The camera body constituted by joining a casing-like 1st body to which a photographic lens can be attached and a 2nd body having an opening and also having a reference plane for positioning a recording medium, is characterized in that the 1st body is brought into contact with nearly the same plane as the plane with the opening formed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a body structure of a camera, and more particularly, to a shape of a rear body forming an aperture, a shape of a front body forming a photographing optical path, and a docking mode of the front body and the rear body.

[0002]

2. Description of the Related Art Conventionally, a framework inside a camera is formed by two structures, which are roughly divided into a front body and a rear body. Taking a single-lens reflex camera as an example, the front body has a bayonet mount with an interchangeable lens, a main mirror,
A prism box etc. will be installed to wait for the function to secure the shooting optical path. In addition, the rear body is equipped with a patrone chamber for loading a film patrone, a spool chamber for winding the film drawn from the patrone, an aperture that regulates the shooting screen, etc.By docking the front body and the rear body, It constitutes the framework. The docking configuration of the conventional camera is shown in FIGS. 6 and 7.

FIG. 6 is a perspective view showing a first conventional example.
In FIG. 6, the rear body 410 has an aperture 411 that defines a shooting screen, a cartridge chamber 412, and a spool chamber 413. The rear body 410 includes a front body 420, which will be described next, and a docking surface 41 on the side of the cartridge chamber.
4 to 415 and spool chamber side docking surfaces 416 to 4
It is docked (contacted) at 17.

The front body 420 has a bayonet mount mounting surface 421. The front body 420 is attached to the docking surfaces 422 to 422a on the cartridge chamber side and the docking portions 423 to 424 on the spool chamber side in the rear body 410.
Is docked with.

FIG. 7 is a perspective view showing a second conventional example.
In FIG. 7, the rear body 430 has an aperture 431 that defines a shooting screen, a cartridge chamber 432, and a spool chamber 433. The rear body 430 includes a front body 450, which will be described next, and a docking surface 43 on the side of the cartridge chamber.
4 to 435, spool chamber side docking surfaces 436 to 43
7, near the aperture upper docking surface 438-43
9, and aperture lower docking surfaces 440-44
Docked at 1.

The front body 450 includes a bayonet mount mounting surface 451 and a docking portion 452 on the side of the cartridge chamber.
453, spool chamber side docking parts 454 to 455, prism box storage part rear side docking parts 456 to 45
7. Bayock mount mounting surface lower docking part 45
8 to 459, docked with the rear body 430.

In FIG. 7, in addition to the four positions in the example of FIG. 6, the rear body 430 has two docking surfaces on the upper side near the aperture and two docking surfaces on the lower side of the aperture on the front side of the cartridge chamber and the spool chamber. The front body 450 has two docking surfaces on the rear side of the prism box storage portion and two on the back side below the bayonet mount mounting surface.

[0008]

In recent cameras, a front body and a rear body are molded by plastic molding,
In the front body, the dimension in the optical axis direction from the bayonet mount mounting surface to the rear body docking surface and the dimension in the optical axis direction from the film rail surface to the front body docking surface in the rear body are precisely controlled. The dimensions from the lens mount surface to the film rail when the body and rear body are docked are set with high precision without adjustment.

However, in the configuration of FIG. 6, the patrone chamber and the spool chamber on the rear body side are deformed back and forth due to molding, and the dimension from the rail surface to the docking surface cannot be accurately reproduced in many cases.

In the configuration of FIG. 7, the prism box storage portion on the front body side is deformed by molding, and the dimension from the bayonet mount mounting surface to the rear upper docking surface cannot be accurately reproduced in many cases. The docking surface on the upper rear part of the body is a downward pulling type, and the docking surface on the lower back side of the bayonet mount mounting surface is a downward pulling type.

The present invention has been made in view of the above problems, and an object of the present invention is to reduce the dimensional variation due to the molding of the front body and the rear body and accurately reproduce the dimensions when docked.

[0012]

To achieve this object, a camera body according to a first aspect of the present invention has a housing-shaped first body to which a taking lens can be attached, an opening, and In a camera body configured by joining a second body having a reference surface for positioning a recording medium, the first body is brought into contact with a surface substantially the same as the surface having the opening.

A camera body according to a second aspect of the present invention is the camera body according to the first aspect, wherein the first body and the second body are fixed to each other by fastening means at the peripheral portion of the opening.

A camera body according to a third aspect of the present invention is characterized in that, in the first or the second aspect, the reference surface constitutes a film rail or an attachment surface of the image pickup device.

A camera body according to a fourth aspect of the present invention is the camera body according to any one of the first to third aspects, wherein a surface of the first body that contacts the second body is provided with a shutter unit of the camera.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

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

In FIG. 1, the rear body 110 includes an aperture 111, a cartridge chamber 112, and a spool chamber 113.
Have. The rear body 110 is docked with the front body 120 described below at the aperture upper docking surfaces 114 to 115 and the aperture lower docking surfaces 116 to 117.

The front body 120 has a mirror box 121 for accommodating a main mirror and bayonet mount mounting surfaces 122 to 126 (one position on the lower left side is not shown). The front body 120 is docked with the rear body 110 at the aperture upper docking portions 127 to 128 and the aperture lower docking portions 129 to 130. The docking of the front body 120 and the rear body 110 is realized by attaching the rear body 110 to the front body 120 from the rear side of the optical axis with the docking screws 161 to 164.

The bayonet mount 140 is mounted in the bayonet mount mounting holes 141 to 146 by bayonet mount mounting screws 151 to 156. Bayonet mount mounting screws 151-156
Attaches the bayonet mount 140 to the front body 120 from the front side of the optical axis. A schematic perspective view in which this state is clear is shown in FIG.

As shown in FIG. 2, the front body 120 includes a bayonet mount mounting surface 131, a penta mirror (penta prism) housing portion 132, and the mirror box 1.
It has a box-shaped structure provided with 21, and has a shape that is not easily affected by deformation during molding.

Also, the six locations on the bayonet mounting surface are
It is provided on the same plane on the front side of the optical axis, and is formed by a die that is pulled out on the front side. Four positions on the rear body docking surface are provided on the same plane on the rear side in the optical axis direction, and are formed in a mold for pulling out on the rear side. As described above, by forming the respective mounting surfaces with the same mold, the dimensional variation is reduced.

FIG. 3 is a front view of the rear body 110 as seen from the front side in the optical axis direction. Docking surface 114-115 above the aperture and docking surface 1 below the aperture
16 to 117 are confirmed.

FIG. 4 is a rear view of the front body 120 viewed from the rear side in the optical axis direction. Docking surfaces 127-128 above the aperture and docking surfaces 129-130 below the aperture are identified.

FIG. 5 is a rear view of the front body 120 with a focal plane shutter attached, as viewed from the rear side in the optical axis direction. The shutter 170 has screws 171 to 17
2 is attached to the front body 120. The docking surfaces 127 to 130 are provided outside the shutter 170. In the docking of the front body 120 and the rear body 110, if it is necessary to make a fine adjustment to the dimension from the bayonet mount surface to the film rail surface, it is sufficient to put washers for dimension adjustment on these four docking surfaces and dock. If the heights of the four docking surfaces are aligned, a thin plate having a hole larger than the aperture may be placed behind the shutter, and the plate may be sandwiched between the docking surfaces for docking. Further, when the film rail serving as the reference surface of the rear body 110 is made of metal, it is configured to be harder than plastic, so that it is possible to more accurately measure the dimensions. Further, the presence of the highly rigid shutter unit on the contact surfaces of the front body 120 and the rear body 110 makes it possible to obtain more accurate dimensions.

[0026]

As described above, according to the camera body of the present invention, the first body is brought into contact with substantially the same plane as the reference plane of the second body having the opening, so that the deformation during molding can be prevented. Reduces the influence of variations due to influence and mold configuration,
By suppressing the dimensional variation of the front body and the rear body, it becomes possible to accurately reproduce the dimension in the optical axis direction from the bayonet mount mounting surface to the film rail surface when docked.

Further, according to the invention of claim 4, since the shutter unit which is made harder than the plastic is present, the size can be more accurately obtained.

[Brief description of drawings]

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

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

FIG. 3 is a front view showing an embodiment of a camera body according to the present invention.

FIG. 4 is a rear view showing an embodiment of a camera body according to the present invention.

FIG. 5 is a rear view showing an embodiment of the camera body according to the present invention.

FIG. 6 is a perspective view showing an example of a conventional camera body.

FIG. 7 is a perspective view showing an example of a conventional camera body.

[Explanation of symbols]

110 rear body 111 aperture 112 Patrone Room 113 spool room 114 Aperture Upper docking surface 116 Aperture lower docking surface 120 front body 121 mirror box 122 Bayonet mount mounting surface 127 Aperture upper docking part 129 Aperture lower docking part 140 bayonet mount 141 holes 151 screw 161 docking screw 170 shutter 171 screw

Claims (4)

[Claims] 1. A housing-shaped first body to which a photographic lens can be attached and a second body having an opening and a reference surface for positioning a recording medium are joined together. The camera body according to claim 1, wherein the first body is in contact with a surface substantially the same as the surface on which the opening is present. 2. The camera body according to claim 1, wherein the first body and the second body are fixed to each other by fastening means at a peripheral portion of the opening. 3. The camera body according to claim 1, wherein the reference surface constitutes a film rail or a mounting surface of an image pickup device. 4. The camera body according to claim 1, wherein a shutter unit of the camera is provided on a surface of the first body that abuts the second body.