JPH0119128Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a sprocket release button which releases a film feeding sprocket from a winding transmission mechanism by pushing the button and enables film rewinding.

The sprocket release button is usually located in a recess on the bottom of the camera. This is because placing it at the bottom of the camera is natural and easy in terms of mechanical design, and because it is only used for rewinding or, in extremely rare cases, for multiple exposure, operability is not a big issue. Conceivable. Moreover, by providing the recess, it is also prevented from being operated inadvertently.

However, this structure is unsuitable for structural cameras that utilize the bottom surface of the camera for a motor drive, or for cameras that have a motor drive mechanism coupled to the bottom surface of the camera as an attachment.

The purpose of this invention is to improve the utilization of the space on the bottom of the camera by providing a sprocket release button on the top of the camera, and to solve all the various problems that would occur if the release button was provided on the top of the camera. The purpose of the present invention is to provide a sprocket release button structure.

In order to achieve the above object, the structure of the sprocket release button according to the present invention is such that the sprocket release button is provided at a lower position near the periphery of the upper surface of the viewfinder cover of the camera, and the release button is provided on the lower surface side. A cavity is provided for accommodating the release button in the protruding position, and is pivoted to the finder cover so as to be movable between a position for accommodating the release button and a release position for exposing the release button such that the release button can be pushed, and the upper surface thereof is connected to the upper surface of the finder cover. a button cover lever that is at approximately the same height as the release button and has a rear wall surface that is substantially continuous with the rear wall surface of the front cover at a position that accommodates the release button;
The button cover lever is comprised of biasing means for biasing the button cover lever toward a position that accommodates the sprocket release button.

According to the above configuration, the problem of the release button being operated inadvertently is solved, and a preferable external design of the camera can be obtained, so that the object of the present invention can be completely achieved.

The structure according to the present invention will be described in more detail below with reference to the drawings and the like.

FIG. 1 is a plan view showing a state in which the button cover lever accommodates the button, and FIG. 2 is a plan view showing the button cover lever in an open state in which it can be operated.

A portion 1b from the rear of the viewfinder cover 1 is one step lower than a portion 1a, and a release button 3 is made to protrude from this portion 1a.

When the release button 3 is pushed down, the sprocket release shaft 7 is pushed down, and the engagement between the sprocket (not shown) and the hoisting force transmission mechanism is released, and a state in which rewinding is possible is formed. In addition, as shown in Figure 3, button 3
There is no problem even if the center of the shaft 7 is shifted from the center of the shaft 7, and the position of the button is not strictly limited to the position of the sprocket. As shown in FIG. 5, the button cover lever 2 has a boss 2c, and a cavity 2b that can sufficiently accommodate the top of the button 3 is provided on the lower side. Further, a protrusion 2a is provided on the front surface to make it easier to rest your fingers on. This button cover 2
The top surface is at approximately the same height as the top surface of the finder cover 1, and the back wall surface forms a surface that is continuous with the back wall surface of the finder cover 1 at a position where the release button 3 is accommodated. is given. Therefore, when the release button 3 is housed, the top surface and back surface of the button cover lever 2 are continuously integrated with the top surface and back surface of the finder cover 1, as if forming a part of the finder cover 1. looks like.

As shown in FIGS. 3 and 4, this button cover lever 2 has a boss 2c at one end of the front cover 1.
It is inserted into the bearing part provided in part b. A stop plate 5 is attached to the lower end of the boss 2c with a screw 4.
A spring 6 is hung between this stop plate and the cover 1. 3 and 4, the spring 6 is shown inserted between the screw 4 and the stop plate 5. This spring 6 is not shown because it biases the assembly of the button cover 2, stopper plate 5, and screw 4 so that the button cover 2 is in the position shown in FIG. 1 with respect to the viewfinder cover 1. At the position where one end of the spring 6 is attached to the winder cover 1
The other end is hung on the stop plate 5. This spring 6 applies a clockwise rotational force to the button cover lever 2 in FIGS. 1 and 2, and the button cover lever 2 is normally positioned at the position shown in FIG. 1 (FIGS. 3 and 4). As a result, the lower cavity 2 of the button cover lever 2
The button 3 is accommodated in b, forming a state in which the button cannot be pressed down carelessly.

When it is necessary to operate the release button 3, the button 3 can be operated by bringing the button cover lever 2 to the open position in the counterclockwise direction as shown in FIG.

Since the structure according to the present invention is configured as described above, the following features can be obtained.

Since the button cover lever 2 normally accommodates the button 3, the problem of the operator unconsciously pressing the button 3 is completely solved.

Further, it is possible to completely prevent an accident in which the part of the camera's viewfinder cover where the button 3 is provided hits a surrounding object and the sprocket is released.

Next, when the button cover lever 2 is in the release button storage position, the lever 2 can be shaped as if it were a part of the viewfinder cover 1, resulting in a very cohesive design.

When operating the button 3, the button 3 can be operated with one finger while preventing the cover lever 2 from returning, so it can be said that the operability is excellent.

[Brief explanation of the drawing]

1 and 2 are plan views of a camera employing the structure according to the present invention, with FIG. 1 showing the sprocket release button in the retracted position and FIG. 2 showing the sprocket release button in the open position. Figure 3 is a cross-sectional view taken along the line A-A in Figure 1, and Figure 4 is a cut-away end view taken along the line B-B. Not shown. FIG. 5 is an enlarged view of the button cover lever. 1... Winder cover, 2... Button cover lever, 3... Sprocket release button, 4... Screw, 5... Stop plate, 6... Spring, 7... Sprocket release shaft.

Claims (1)

[Scope of utility model registration request] A sprocket release button is provided near the periphery of the top surface of the camera camera at a lower position, and a cavity is provided on the lower surface side to accommodate the release button in a protruding position. It is pivoted to the window cover so as to be movable between a retracted position and a release position where it is exposed so as to be pushed, and whose upper surface is approximately at the same height as the upper surface of the window window cover, and at which the release button is accommodated. A sprocket release button comprising: a button cover lever whose wall surface forms a surface substantially continuous with the rear wall surface of the viewfinder cover; and urging means for urging the button cover lever toward a position in which the sprocket release button is accommodated. structure.