JPS6128185Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a camera back cover device which is pivotably mounted on a camera body and can be opened and closed, and particularly relates to a camera back cover device suitable for a camera equipped with a simple film loading device.

When carrying a camera while traveling, it is preferable that the camera be small and lightweight. Therefore, in recent years, there has been a call for miniaturization of cameras, and various efforts have been made to make cameras smaller.

In order to facilitate the loading of film, a method has been adopted in which the back cover is pivoted to the camera body and opened and closed using a hinge, but in many cases the hinge portion is a protrusion in relation to the exterior of the camera.

FIG. 1 is a cross-sectional view showing an embodiment of a conventional camera back. In the figure, 1 indicates the main body, and 2 indicates the back cover. The back cover 2 is pivoted by a back cover hinge 3 having a shaft 4. The film stored in a film supply chamber 10, which is a film supply space, passes between the pressure plate 6 and the main body 1, and is sent by a sprocket 7 to a film winding chamber 5, which forms a film winding space. Reference numeral 9 denotes a spool, and the film winding chamber 5 must form a cylindrical space with at least some margin for the maximum diameter for winding the film.
Reference numeral 11 denotes a key plate for locking the back cover on the main body side, which forms a locking means for locking the back cover to the main body 1. 2b
2a is a locking claw on the back cover side, and 2a is a light leak prevention piece for the back cover lock. In the conventional device, the hinge portion 4 protrudes to the side of the body, similar to the structure described above. This protrusion is placed on camera holding during shooting operation.
It gives a strange feeling to the palm of your hand. Furthermore, in recent years, cameras have been commercialized that can be carried without using a case by simply putting them in the pockets of jackets, pants, etc., or in handbags, but these protrusions can cause damage to pockets and other items. There is. As a countermeasure to these problems, there is a method of increasing the thickness of the main body 1 so that the hinge part of the back cover is the same, but this goes against the trend of making cameras more compact.

An example is shown in FIG. It is clear that if the configuration is as shown in FIG. 2, the width of the camera will be increased.

An object of the present invention is to provide a back cover device that is suitable for camera holding without increasing the size of the camera body due to the pivoting part of the back cover in conjunction with a simple camera loading device.

In order to achieve the above object, the camera back cover device according to the present invention guides the leading edge of the film pushed through the exposure opening to the take-up spool, and automatically captures and winds the leading edge of the film. In the back cover device of a camera having the device, the inner surface is provided integrally with the camera body so as to guide the leading end of the film from the exposure opening toward the spool,
a fixed guide wall forming a rear wall surface of the film winding chamber; and a fixed guide wall provided on the outer surface of the fixed guide wall at a position corresponding to the spool, and on a thick part of the guide wall inside the outline of the camera body. The cardinal branch and
and a back cover pivotably supported on the fixed guide wall via the pivot portion so as to be freely openable and closable.

According to the above configuration, the object of the present invention can be completely achieved.

The present invention will be explained in more detail below with reference to the drawings. FIG. 3 is a cross-sectional view showing an embodiment of the camera back cover device according to the present invention.

In the figure, 22 is a camera body, which is normally molded integrally with a frame forming the exposure opening 12. A film cartridge 9 is housed in the film supply chamber 10. A film take-up spool 21 is provided in the film take-up chamber 5. The spool 21 is provided with a large number of protrusions at the height of the perforation of the film. When the film is pulled out from the cartridge 9, placed on the sprocket 13, and the back cover is closed, the pressure plate 14 presses the film against the rail surface forming the focal plane. A normal winding operation rotates the sprocket 13 and transports the film to the right in the figure. In this embodiment, a fixed guide wall 23 is provided integrally with the camera body 22. The inner surface of the fixed guide wall 23 forms the inner wall surface of the film take-up chamber 5, and also has an inner wall surface that guides the leading end of the film in the direction shown by the broken line P. The roller arm 18 is rotatable about a shaft 20 and is biased counterclockwise in the figure by a spring 19. A roller 17 is rotatably supported at the tip of the arm 18.

The perforation near the tip of the film fed along the inside of the roller arm 18 engages with the claw of the spool 21 near the roller 17, and is wound up by the counterclockwise rotation of the spool 21. Further detailed structure and modification of this simple loading device are disclosed in Utility Model Application No. 54-166288 and Utility Model Application No. 56-83734.
is explained in detail.

A hinge shaft 16 of the back cover 15 is provided at a position corresponding to the central axis of the spool 24 on the outside surface of the fixed guide wall 23 and the back surface of the camera, and the back cover 15 can be opened and closed around this shaft 16. . Reference numeral 24 indicates a key plate provided on the body side of the camera, and 25 indicates a back cover pawl that is locked by the key plate.

In the device according to the present invention, the support shaft of the back cover is placed closer to the center of the camera instead of the left and right edges, so the hinge part may protrude to the side edges of the camera, and to prevent this protrusion, the sides are thickened to prevent escape. There is no need to provide it.

In addition, the fixed guide wall forms the outline of the camera and surrounds the film winding chamber.
The quick loading mechanism is effectively protected.

Various modifications can be made to the embodiments described in detail above within the scope of the present invention.

In this embodiment, the fixed guide wall 23 is connected to the camera body 2.
It is installed separately from 2 and fixed, but
It may be formed integrally. Moreover, it is also possible to further provide other guide members inside the guide wall, if necessary. The simple loading mechanism may also have other configurations.

In short, the camera back device according to the present invention has a structure that substantially seals the spool side of the simple loading device from the outside, and utilizes this structure to move the pivot position of the camera back toward the center of the camera to improve operability (camera holding). ), and provides a camera external shape suitable for miniaturization.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing a conventional back cover device, respectively, and FIG. 3 is a cross-sectional view showing an embodiment of the back cover device according to the present invention. 1...Main body (camera body), 2...Back cover, 3
... Hinge, 4 ... Hinge shaft, 5 ... Film take-up chamber, 6 ... Pressure plate, 7 ... Sprocket, 9 ...
Spool, 10... Film supply chamber, 11... Key plate, 12... Exposure opening, 13... Sprocket, 14... Pressure plate, 15... Back cover, 16... Hinge shaft, 17... Guide roller, 18... Roller arm, 19... Roller arm spring, 20... Support shaft, 21... Spool, 22... Main body (camera body), 23... Fixed guide wall, 24... Key board,
25...Back cover claw.

Claims (1)

[Scope of utility model registration request] In a camera back cover device that has a simple film loading device that guides the leading edge of the film pushed through the exposure opening to a take-up spool and automatically captures and winds the leading edge of the film, the inner surface of the film is a fixed guide wall provided integrally with the camera body so as to guide the leading end of the film in the spool direction and forming a back wall surface of the film take-up chamber; and a position corresponding to the spool on the outer surface of the fixed guide wall,
The guide wall includes a pivot portion provided in a thick portion of the guide wall inside the outline of the camera body, and a back cover pivotably supported to the fixed guide wall via the pivot portion so as to be openable and closable. Features camera back cover device.