JPH0643785Y2 - Camera back cover opening device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a back lid opening device for a drop-in loading camera.

[Conventional technology]

In the drop-in loading type camera, when the back cover is opened to a predetermined angle when loading the film, an opening for loading a cartridge appears at the bottom of the camera body, and the back cover opened to the predetermined angle and the bottom of the camera body. A slit serving as an insertion guide for the film leader portion is formed therebetween. Then, with the film leader portion pulled out to some extent, if the cartridge is axially loaded from the opening, the cartridge is introduced into the predetermined accommodation chamber, and the film leader portion is guided by the slit into the spool chamber. The film loading operation can be simplified.

In such a drop-in-loading camera, the back cover can be opened at a predetermined angle for loading the film, and can be opened widely for maintenance and inspection of the internal mechanism of the camera. There is. Such a camera back cover opening device is disclosed in, for example, US Pat. No. 4,669,845. This publication discloses a configuration in which an opening regulating lever is provided on a back lid which is biased by a spring in the opening direction, and the opening regulating lever is detachably attached to a camera body. When the release control lever is still engaged with the camera body, the back cover is opened only to the film loading position, and the release control lever and the camera body are disengaged to open the back cover largely. You will be able to.

[Problems to be solved by the invention]

However, in the case of the back cover opening device as disclosed in the above publication, the regulating lever must be attached to the case back, and the camera body side must be provided with the engaging portion for engaging and disengaging the regulating lever. However, the number of parts or the number of assembly steps is increased. Also,
When opening the back cover to the fully open position, the engagement between the control lever and the camera body must be released, and when closing the back cover, the control lever and the camera body must be engaged again. Was also inconvenient.

[Purpose of device]

The present invention has been made in order to solve the above-mentioned drawbacks of the prior art, and provides a back cover opening device for a camera which can reduce the number of parts and the number of assembling steps and can be easily opened and closed. The purpose is to provide.

[Means for solving problems]

In order to achieve the above object, the present invention axially attaches a back cover of a camera so that it can be opened and closed, and uses a leaf spring for urging the back cover in the opening direction between the camera body and the back cover. The first and second pressing parts are integrally formed on the inner surface of the back cover, and the leaf springs are sequentially brought into contact with the first and second pressing parts in accordance with the opening angle of the back cover. (2) The back cover is regulated to open at a predetermined open position by interaction with the pressing part,
Furthermore, it can be opened to the fully open position.

[Action]

In the state where the back cover is closed, the back cover is biased in the opening direction via the first pressing portion, so that the back cover is opened when the lock mechanism of the back cover is released. When the back cover reaches a predetermined open position, the second pressing portion abuts against the leaf spring and presses it in the closing direction, so that the biasing force of the leaf spring in the opening direction is canceled out and the back lid stays at that position. Be stopped. To open the case back further, after the leaf spring is deformed by the second pressing portion,
Since the back cover is urged in the opening direction via the second pressing portion, the back cover is opened to the fully open position.

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

〔Example〕

FIG. 1 is an external perspective view of a camera using the present invention, in which the camera body 1 is turned upside down to open the back cover 3 to the regulation position.
A shaft 25 for pivotally mounting the back cover 3 is provided on the camera body 1, and is inserted into a bearing portion 2 formed integrally with the back cover 3. This camera employs a drop-in loading mechanism that loads the film cartridge P from the bottom of the camera body 1 along the axial direction of the cartridge shaft. Therefore, as shown in the figure, when the back cover 3 is opened up to a certain angle about the shaft 25, the opening is restricted, and the opening 4 for inserting the film cartridge P is exposed at the bottom of the camera body 1, A slit 5 is exposed between the bottom of the body 1 and the back cover 3 for facilitating insertion of the film leader portion F pulled out from the film cartridge P into the camera body 1. An opening / closing door 11 for loading a battery is provided at the bottom of the camera body 1.

The back cover 3 has an L-shaped cross section so that its bottom surface extends to the bottom surface side of the camera body 1, and its edge portion 7 is a receiving surface 8 formed on the bottom surface of the camera body 1. When the case back 3 is closed, the inside of the camera is kept light-tight. When the back cover 3 is pushed in the closing direction, the closing protrusion 10 provided on the back cover 3 and the hook 20 provided on the camera body 1 are engaged with each other, and the back cover 3 is locked at the closed position. . Further, by operating the knob 21 on the camera body 1 side, the engagement between the closing projection 10 and the hook 20 is released, so that the back cover 3 can be opened.

As shown in FIG. 2 which is a partial cross-sectional view of the camera body 1 and the back cover 3, the back cover 3 that makes the film winding chamber 24 provided with the winding spool 24a light-tight is The first pressing portion 22 and the second pressing portion 23, which are integrally formed, each have the bearing portion 2
It is provided on the outer periphery of the back cover 3 and rotates integrally with the back cover 3 about the axis 25 of the camera body 1 when the back cover 3 is opened and closed. A leaf spring 26 that applies a biasing force to the back cover 3 in the opening direction is fixed to the camera body 1 by a mounting protrusion 29 in a gap between the body side wall 27 and the battery chamber wall 28 that defines the battery chamber. Battery compartment wall
A protrusion 28a is formed on the plate 28 to apply a biasing force while fixing the position of the leaf spring 26.

The protruding shapes of the first pressing portion 22 and the second pressing portion 23 are such that when the back cover 3 is closed, only the first pressing portion 22 is biased by the leaf spring 26, and the back cover 3 is for loading the cartridge as described above. When opened to a certain angle, the first pressing portion 22 and the second pressing portion
Both 23 are pressed by the leaf spring 26, and only the second pressing portion is pressed when fully opened.

According to the camera configured as described above, when the back cover 3 is locked at the closed position, the first pressing portion 22 formed on the left side of the bearing portion 2 as shown in FIG. Is biased by the leaf spring 26, but the closing protrusion 10 and the hook 11
The back cover 3 does not rotate due to the engagement with. When the knob 21 is operated to unlock the back cover 3, the back cover 3 is rotated clockwise by the urging force of the leaf spring 26 acting on the first pressing portion 22.

When the back cover 3 opened in this way opens to a certain angle, the third
As shown in the figure, the second pressing portion 23 contacts the leaf spring 26 from above. In this state, the leaf spring 26 that urges the back cover 3 in the opening direction via the first pressing portion 22 is pressed downward by the second pressing portion 23, so that the urging force on the back cover 3 is offset. To be done. Therefore, the back cover 3 comes to be stopped at the fixed open position for loading the cartridge. After loading the cartridge, the back cover 3 is rotated in the closing direction as it is to close the projection.
The 10 may be engaged with the hook 20. If you want to open the back cover 3 wider for inspection and repair inside the camera,
The back cover 3 is manually rotated clockwise. As a result, the first pressing portion 22 separates from the leaf spring 26, the second pressing portion 23 moves while pushing down the leaf spring 26, and after the second pressing portion 23 rotates to the position shown in FIG. The leaf spring 26 receives a biasing force in the upward direction. The back cover 3 is biased in the opening direction from the leaf spring 26 via the second pressing portion 23, and is rotated to the fully opened position shown by the chain double-dashed line in FIG. . In the fully open position, the back cover 3 comes into contact with the edge portion 27a of the body side wall 27 and stops. In addition, when closing the back edge 3 from the fully open position, the back lid 3 can be rotated counterclockwise as it is, as shown in FIG.
After the state shown in the figure, the closing projection 10 is locked to the hook 20, and the closed state shown in FIG. 2 is obtained.

Incidentally, in the above embodiment, the first and second pressing portions 22, 23
The leaf spring 26 and the leaf spring 26 are provided close to the end portion of the shaft 25, but it is of course possible to provide these in the middle portion of the shaft 25. In addition, the first pressing portion 22 and the second pressing portion 23 are not formed as separate protrusions but are formed as continuous raised portions, and both ends thereof may be used as the first and second pressing portions. Good.

[Effect of device]

As described above, in the back lid opening device of the present invention, the regulation protrusion having the first and second pressing portions for regulating the opening and closing of the back lid at the first and second angles is formed at the opening and closing center portion of the back lid. Then
A leaf spring provided between the back cover and the camera body applies a biasing force for pressing them. Therefore, since the number of mechanical parts such as the spring for opening the back lid and the stopper for opening position regulation, which are used in the conventional back lid opening device, can be saved, and the assembling becomes very simple, Great advantages in manufacturing. Further, the opening / closing operation of the back cover is very simple because it is only necessary to push / pull the back cover except for the operation of releasing the back cover lock mechanism.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view on the bottom side showing a state in which a film is loaded into a camera using the present invention. FIG. 2 is a partial sectional view of the camera shown in FIG. 1 when the back cover is closed. FIG. 3 is a partial cross-sectional view of the camera shown in FIG. 1 in a state where the back cover is opened to a certain regulation position. FIG. 4 is a partial cross-sectional view showing a state where the back cover of the camera shown in FIG. 1 is being opened to the fully open position. 1 …… Camera body 2 …… Opening / closing center part 3 …… Back cover 10 …… Closing protrusion 22 …… First pressing part 23 …… Second pressing part 24 …… Film winding chamber 26 …… Leaf spring 27 …… Body side wall 28 ... Battery compartment wall

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Creator Kazuo Kamata 2-26-30 Nishiazabu, Minato-ku, Tokyo, Fuji Photo Film Co., Ltd. (56) References: 62-57233 (JP, U) 46-18289 (JP, Y1)

Claims (1)

[Scope of utility model registration request] 1. A camera back cover opening device for restricting the opening of a back cover rotatably attached to a camera body at a predetermined open position, and opening the back cover to a fully open position beyond the predetermined open position. In, a leaf spring for urging the back lid in the opening direction with respect to the camera body, a first pressing portion formed on the inner surface of the back lid so as to receive the urging force in the opening direction from the leaf spring, and the back lid are When it rotates to a predetermined open position, it comes into contact with the leaf spring, restricts the biasing force of the leaf spring in the opening direction, and stops the opening of the back lid,
Further, when the back lid is opened beyond the predetermined position, the second pressing portion formed on the inner surface of the back lid is opened to receive the biasing force from the leaf spring in the opening direction to open the back lid to the fully opened position. A back cover opening device for a camera, which comprises: