JPH0538335Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a camera having a switch that opens and closes in conjunction with opening and closing of the back cover. PRIOR ART In recent years, many cameras have been equipped with a motor or a motor drive unit for winding and rewinding the film. In some cameras of this type, the loaded film is automatically advanced to the photographable area when the back cover is closed, and these require a switch mechanism that generates a signal when the back cover is closed. becomes. Japanese Utility Model Publication No. 44-11989 discloses a camera in which the switch is closed and the film is moved idly by closing the back cover. However, in the embodiment shown in this invention, the camera back cover operates the switch on the camera body side, so there is a possibility that the switch may close before the back cover is completely closed. There is a great risk that the film will be exposed while it is being fed. In another embodiment, a fixed key member is provided on the camera back, and a movable key member is provided on the opposite side of the camera body and is biased by a spring in the direction of engagement with the fixed key member. It is shown. However, in this embodiment, the switch is closed by a movable key, so the movable key must be locked against the spring to prevent the switch from closing when the back cover is open. and requires a locking member. As a result, the mechanism inside the camera becomes complicated, leading to higher costs and the camera becoming larger. Purpose In view of the above-mentioned points, an object of the present invention is to provide a camera having a simple structure and having a switch that is switched when the back cover is completely closed and in a locked state. Overview The present invention is such that when the back cover is completely locked, the switch mechanism on the main body side is switched by the operating part of the movable member provided on the back cover side. Embodiment An embodiment of the present invention will be explained with reference to FIGS. 1 to 4. FIG. 1 is a perspective view of the main parts of a camera to which this embodiment is applied, seen from above, and FIG. 2 is a perspective view showing a back cover and related members. A back cover 2 is provided on the back of the camera body 1, and is supported by a hinge mechanism 3 on the side surface of the camera body 1 so as to be openable and closable. Inside the back of the camera body 1, there are provided a cartridge chamber 5 into which a film cartridge 4 is loaded and a winding chamber 6 for winding photographed film. Furthermore, a battery 7 is housed on the left side of the cartridge chamber 5 in FIG. 1 for supplying power to a motor (not shown) for winding and rewinding the film. Since the cross section of the film cartridge 4 is substantially circular, a substantially triangular prism-shaped space 8 is formed on the back side of the cartridge chamber 5 on the battery chamber side, as shown in FIG. A fixed key portion 1a and a switch mechanism 10 , which will be described later, extend from the camera body 1 into this space 8. When the back cover is closed, a substantially triangular prism-shaped movable member 11 corresponding to the space 8 provided in the back cover 2 enters the space 8 and engages with the fixed key portion 1a and the switch mechanism 10 as described later. match. Next, the movable member 11 provided on the back cover 2, the fixed key portion 1a of the camera body that engages with the movable member 11, and the switch mechanism 10 will be explained based on FIG.
The fixed key part 1a fixed to the camera body 1 is formed of an L-shaped member having an engaging part 1a' which is a rising part with a curved surface that tapers upward with the wall surface on the back cover side. ing. A normally open switch mechanism 10 is fixed above the fixed key portion 1a.
The switch mechanism 10 includes a support part 10a, a fixed conductive contact piece 10b supported by the support part 10a, a movable conductive contact piece 10c, and a slope that is fixed to the movable contact piece 10c and widens from top to bottom. Insulating passive part 1
It is composed of 0d. This switch mechanism 1
0 is positioned so that when the back cover is closed, the movable contact piece 10c moves in the longitudinal direction of the camera as the passive part 10d is pushed from above by an operating part 11c of the movable member 11, which will be described later. The switch mechanism 10 is connected to a film feed circuit (not shown), and when the switch mechanism 10 is closed, the film is fed by rotating a motor (not shown). In addition, the camera back 2 indicated by the two-dot chain line in FIG.
Two pins 2a are fixed on the inner surface of the camera back 2, and are inserted into two long holes 11a in the vertical direction formed in the movable member 11 in the shape of a substantially triangular prism. On the other hand, it is supported so as to be movable in the vertical direction. The movable member 11 is biased downward by a spring 12 supported by the back cover 2 at one end. On the side surface of the movable member 11, a movable key part 11b is integrally formed, which is L-shaped and has an engaging part 1b' downward, similar to the fixed key part 1a. The fixed key part 1 of this engaging part 11b'
The surface facing a is a curved surface similar to the fixed key portion 1a. The movable member 11 and the fixed key portion 1a are constructed such that when the movable member 11 is at the lowest position, the engaging portions 11b' and 1a' of both members 11 and 1a are located at the same height. Further, on the side surface of the movable member 11, an actuating part 11c is provided which projects in the longitudinal direction of the camera at a position corresponding to the passive part 10d of the switch mechanism 10 provided on the back cover 2. on the other hand,
A rectangular hole 2b is bored in the back cover 2, and a manual operation part 11d formed integrally with the movable member 11 is exposed from the back cover 2 to the outside of the camera. Next, the operation of this embodiment configured as described above will be described. In the open state of the back cover shown in FIG .
is open to the fixed contact piece 10b. On the other hand, the movable member 11 is positioned downward by the spring 12 when the back cover is open. Here, when the film cartridge 4 is loaded as shown in FIG. The engaging part 11b' of the key part 11b of the member 11 collides with the engaging part 11b', and the key part 11b tries to climb over the fixed key part 1a along the curved surface, and the movable member 11 rises against the spring 12. (See Figure 3). Since the movable member 11 rises in this manner, the operating portion 11c provided thereon moves above the driven portion 10d as shown in FIG. 3 without contacting the driven portion 10d of the switch mechanism 10 . When the back cover is further closed, the key part 11b climbs over the top of the fixed key part 1a, the movable member 11 moves downward again by the spring 12, the key part 11b and the fixed key part 1a engage, and the back cover 2 is closed. Lock in closed position. As the movable member 11 moves downward, the actuating portion 11
c moves the passive part 11d in the longitudinal direction of the camera by pushing the inclined surface of the passive part 10d from above, and brings the movable contact piece 10c into contact with the fixed contact piece 10b against its own spring force. Then, a film feed circuit (not shown) is closed, and a motor (not shown) feeds the film from the film cartridge 4 to the photographing movable part. When the film is finished, the operation part 11d protruding from the outside of the back cover 2 is pushed upward against the spring 12 to move the movable member upward, and the fixed key part 1a and the movable member 1 are moved upward.
The back cover can be opened by disengaging the key part 11b. At this time, the actuating part 11c also moves upward and moves from the contact position with the passive part 10d of the switch mechanism 10 , so the movable contact piece 10c returns by its own behavior and becomes non-conductive with the fixed contact piece 10b. , the switch mechanism 10 is opened. In this embodiment, the camera body 1 is provided with the fixed key part 1a and the switch mechanism 10 , and the back cover 2 is provided with the key part 11b of the movable member 11, so when the back cover 2 is opened, the movable member 11 is Even if the switch mechanism 10 is positioned downward by the spring 12, the switch mechanism 10 is not closed because the switch mechanism 10 and the key portion 11b are separated from each other. Therefore, it is not necessary to lock the movable key part in the unlocked position when opening the back cover as in the conventional case, and the locking mechanism is not required, so the cost can be reduced and the camera can be made smaller. Further, since the switch mechanism 10 is closed at the same time that the back cover 2 is completely closed and the key portions 11b and 4a are engaged with each other, light leakage during empty film feeding can be completely prevented. Furthermore, in this embodiment, the fixed key part 1a of the camera body 1 and the switch mechanism 10 are particularly provided in a triangular prism-shaped space 8 that is created when the cartridge 4 is loaded in the cartridge chamber 5.
Move the movable member 11 disposed on the back cover 2 into the space 8
Since it has a triangular prism shape that corresponds to the size of the camera, there is no need to create an additional space for the back cover lock, and the camera can be made more compact. This space is particularly effective because it is a dead space. In this embodiment, the switch mechanism is closed when the back cover is closed, but the present invention is not limited to this, and depending on the circuit configuration of the camera, the switch mechanism may be opened when the back cover is closed. Needless to say, it may be configured as follows. Further, in this embodiment, the switch mechanism is connected to the film feed circuit, but it may also be used to display a warning when the back cover is open, and other applications are possible. Effects As described above, since the camera having the back cover interlocking switch of the present invention is switched after the back cover is locked, it can be highly reliable and free from malfunctions.

[Brief explanation of the drawing]

FIG. 1 is a perspective view from above of a camera showing an embodiment of the present invention. FIG. 2 is a perspective view of the back cover of the camera and related parts. 3 and 4 are perspective views showing the back cover locking mechanism and switch of the camera. 1...Camera body, 1a...Fixed key part, 10 ...
...Switch mechanism, 11...Movable member, 11b...
Key part, 11c...operating part.

Claims (1)

[Scope of Claim for Utility Model Registration] A camera body, a back cover that is provided to the camera body so that it can be opened and closed, a fixed key that is fixed to the camera body, and a movable support on the back cover. a movable member that is biased in one direction with respect to the back cover; a first engagement surface provided on the fixed key portion; and a first engagement surface provided on the movable member and biased in one direction with respect to the back cover; a second engaging surface that engages with the first engaging surface to move the movable member in a direction opposite to the one direction and ride over the fixed key part; a switch mechanism provided at a position facing the movable member of the back cover when the camera back is closed; A camera having a back cover interlocking switch, comprising: a pressing part that comes into contact with and activates the switch mechanism by a backward movement.