JPH052908Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a camera back cover opening/closing detection device, specifically, a camera back cover opening/closing detection device that detects the open/closed state of the camera back using a switch. .

[Prior Art] An opening/closing locking key is provided on the main body side of the camera and moves back and forth when pushed by a protruding key fixed to the back cover, and works with the key to lock the back cover. In a camera in which a switch is turned on and off by moving this key, and the switch signal is used to obtain, for example, a signal to start driving the built-in motor, the switch turns off when the back cover is opened, and the switch is turned off when the back cover is closed. The switch must be turned on when the switch is in the locked state.

However, since the locking key is designed to automatically move back and forth, when the back cover is opened, the locking key moves back and forth and returns to its original position, causing the problem that the switch is turned on. Was. Therefore, conventional devices have been provided with a mechanism that prevents the locking key from moving back when the back cover is open.

[Problems that the invention aims to solve] Therefore, the conventional device requires a mechanism that prevents the locking key from moving back and the switch from closing when the back cover is open, which makes it more complicated and expensive. There was a drawback.

The purpose of the present invention is to prevent the back cover opening/closing detection means from moving, even if the movable opening/closing locking key for locking the camera back is moved carelessly when the camera back is opened, regardless of the movement of the opening/closing locking key. To provide an opening/closing detection device for a camera back cover capable of keeping a detection switch in an on or off state.

[Means and effects for solving the problems] The present invention provides a camera that detects that the back cover is in the closed position with respect to the camera body and holds the back cover in the closed position. A fixed key part provided on the lid and having a key part and a pushing surface is biased toward the camera body toward a position where it engages with the key part of the fixed key part, and is also biased in a biasing direction and in a counter biasing direction. It is provided so that it can slide freely in the direction,
The locking key part which is once retracted to the non-engaging position by the fixed key part and then returned to the engaging position by this urging force to engage and close the back cover. a movable key portion having a protrusion protruding in a direction in which the key portion engages; and a movable key portion disposed at a position opposite to the protrusion portion of the movable key portion, and when the movable key portion is in a biased state, the protrusion near the position where the protruding part of the movable key part is retracted by the pressing surface of the fixed key part when the movable key part is moved in the opposite biasing direction. When the movable key moves in the biasing direction and the movable key moves in the biasing direction, the movable key engages with the locking key, and the movable key moves in the biasing direction. a camera back opening/closing detection means that engages with the protrusion provided on the part; and a camera back opening/closing detection that detects that the camera back is closed in conjunction with the engagement between the camera back opening/closing detection means and the protrusion. A switch is provided so that the detection switch of the back cover opening/closing detection means is kept in the on or off state regardless of the movement of the movable key part.

[Example] The present invention will be explained below with reference to an illustrated example. As shown in FIGS. 1 to 3, the back cover opening/closing detection device according to the present invention includes a protruding key 1, which is a fixed key part integrally attached to the camera back cover (not shown), and a protruding key 1 built into the camera body 3. An opening/closing locking key 2, which is a movable key part, cooperates with the protruding key 1 to lock the back cover in the closed state, and a pressing surface 1c of the protruding key 1.
and a camera back opening/closing detection mechanism 4 having a detection arm 11 and a switch opening/closing arm 12, which are camera back opening/closing detection means that are pushed and moved by the protruding arm 2c of the opening/closing locking key 2, and this detection mechanism 4. The main part thereof is composed of a detection switch S which is turned on and off by the switch opening/closing arm 12.

The protruding key 1, which is a fixed key part, is attached to the camera body 3.
It is formed of two upper and lower key parts 1a and 1b extending in an L-shape toward the opening/closing locking key 2 on the side,
The tops of the key parts 1a and 1b are formed with inclined edges that push the key parts 2a and 2b of the opening/closing locking key 2, and the detection member 1 is formed on the top end surface of the lower key part 1a.
A pushing surface 1c for pushing 1 is formed.

As shown in FIG. 1, the opening/closing locking key 2 is formed of an elongated strip-shaped plate material that is disposed on the side surface of the camera body 3 so as to be movable up and down while being held between protrusions 3a to 3d. On the outer surface, the above-mentioned key part 1a,
A locking key portion 2a protrudes in an inverted L shape toward 1b,
2b is formed, and a protruding arm 2c, which is a protruding part for pushing the detection member 11, is formed on the lower side. Further, the ends of the locking keys 2a, 2b and the protruding arm 2c are each formed with an inclined edge. Opening/closing locking key 2 formed in this way
has a vertically elongated spring storage opening 2d in the center of its upper part, and the upper part of the opening 2d is fitted into a square protrusion 3e protruding from the camera body 3.
A double-acting coil spring 5 is housed inside. Therefore, the opening/closing locking key 2 has a tendency to move downward due to the tension of the coil spring 5 acting on the lower surface of the square projection 3e and the opening 2d.
This movement due to habit is regulated by the protrusion 3e, and the locking position thereof becomes the return position of the opening/closing locking key 2, that is, the locking position of the back cover.

Further, a back cover opening knob 6 is integrally attached to the middle of the outer surface of the opening/closing locking key 2. Then, the back cover opening knob 6 is exposed on the outer surface of the camera body 3, and the opening/closing locking key 2 and the back cover opening/closing detection member 11, which will be described later, are covered with a cover 7 as shown in FIG. It is being said.

The camera back opening/closing detection mechanism 4 is shown in FIGS. 3 and 6.
As shown in the figure, it is attached to a through hole 3g bored in a side wall 3f of a main body cover 3A of the camera main body 3. The camera back opening/closing detection mechanism 4 includes a camera back opening/closing detection member formed by a detection arm 11 and a switch opening/closing arm 12.
It is composed of a support shaft 8 that supports the opening/closing arm 12 and the detection arm 11, and a biasing spring 9.

The detection arm 11 is disposed below the opening/closing locking key 2 (see FIG. 1) and facing the protruding arm 2c. This detection arm 11 has a supporting shaft 8 on the back side of the base.
The tip of the free end extending diagonally upward to the left (as viewed in FIG. 1) is separated into a fork shape. That is, as shown in FIG.
A first pushing part 11a that extends so as to face the pushing surface 1c of a and is pushed and moved by the pushing surface 1c, and the right side of this first pushing part 11a (in FIG. 1). and the protruding arm 2c
It is formed of two prongs with the second pushing part 11b that is pushed by.

FIG. 3 is an exploded perspective view of the camera back opening/closing detection mechanism 4 seen from the back side, and the support shaft 8 whose one end is fixed to the base of the detection arm 11 is made of an elastic synthetic resin material or the like. A large diameter portion 8A rotatably fits into the through hole 3g of the side wall 3f, and a large diameter portion 8A extends inward from the large diameter portion 8A to allow the switch opening/closing arm 12 to swing freely. It is formed by a supporting narrow diameter portion 8B. The large diameter portion 8A has a circumferential groove 8a in the middle, and when it is fitted into the through hole 3g, an O-ring packing 10 is fitted into the circumferential groove 8a as shown in FIG. through hole 3
G is fitted. The narrow diameter portion 8B extending inward is connected to the opening/closing arm mounting portion 8b, which is formed into an oval cross-section with a flat upper and lower surface as shown in FIGS. 3, 6, and 8, and a spring. A disc 8d for preventing the spring 9 from coming off is integrally formed at the distal end. In addition, this narrow diameter portion 8B is provided with a slot 8e that penetrates vertically along the central axis except for the retaining disc 8d. A V-shaped notch 8f is provided toward the top of the tip, and a protruding fin 8g for preventing the opening/closing arm 12 from slipping out is formed at the boundary between the opening/closing arm attachment portion 8b and the spring attachment portion 8c.

The switch opening/closing arm 1 is swingably fitted to the opening/closing arm mounting portion 8b of the support shaft 8 formed in this manner.
As shown in FIG. 3, the switch 2 has a wide switch pushing part 12a at its tip, and has a drum-shaped mounting through hole 12b bored at its base. To attach the switch opening/closing arm 12 to the attachment part 8b, the through hole 12b is fitted into the attachment part 8b by utilizing the elastic deformation of the retaining disc 8d, the protruding fin 8g, and the slot 8e. Then, since the through hole 12b is formed in the shape of a drum, the support shaft 8 only rotates from the state shown in FIG. 9B to the state shown in FIG. 10B with respect to the switch opening/closing arm 12; It rotates integrally with the switch opening/closing arm 12.

Further, the spring 9 wound around the spring mounting portion 8c of the support shaft 8 is composed of a coiled torsion spring, as shown in FIG. The other end 9b is bent inward. And this other end 9
As shown in FIGS. 6 and 7, b is the retaining disc 8d.
It is inserted into the sliding part 8e through the notch 8f, which gives the support shaft 8 and the detection arm 11 the habit of rotating clockwise in FIGS. 3 and 7. As shown in FIG. 9B, the force is blocked by a portion of the flat surface of the opening/closing arm mounting portion 8b of the support shaft 8 coming into contact with a portion of the inner surface of the hourglass-shaped through hole 12b. In addition, in this state, the sensing arm 1
1 is arranged such that its first pushing part 11a faces the key part 1a and is located at a position where it is pushed by the key part (see FIG. 1).

On the other hand, a detection switch S is arranged near the switch pushing part 12a. As shown in FIG. 3, this detection switch S is composed of two leaf switches formed by bending thin elastic conductive plates. That is, the upper elastic conductive piece SA includes a conductive contact piece SA a that extends horizontally forward from the vertical substrate SA _c , a contact piece SA _b that extends forward and obliquely upward, and the above-mentioned conductive contact piece SA _. The lower elastic conductive piece SB extends horizontally from _{the vertical board SB c toward} the front of the conductive contact piece _{SA a .} It is formed of a conductive contact piece SB _a that extends downward and forms a normally closed switch in cooperation with the same contact piece SA _a , and a contact contact piece SB _b that extends horizontally toward the front.

As shown in FIG. 4, the upper elastic conductive piece SA _is connected to the main body cover 3A
is pushed into the mounting part 13a using elasticity,
It is fixed by its own elasticity. In this fixed state, the regulating piece SA _d is in contact with the top surface of the other mounting part 13b of the main body cover 3A, and when the switch is opened, the conductive contact piece SA _a does not follow the downward movement of the conductive contact piece SB _a . be regulated accordingly. In addition, the lower elastic conductive piece SB is also connected to the vertical substrate SB _c as shown in Fig. 5.
By pushing the right-angled bent piece SB _d into the mounting portion 13b using its elasticity, it is fixed by its own elasticity.

Both elastic conductive pieces SA formed in this way,
When a camera internal component (not shown) is installed inside the main body cover 3A, the SB has an upper elastic conductive layer attached to a part of the wiring print pattern of the circuit boards 15A, 15B (see FIG. 9B) incorporated in the internal component. Piece
The contact piece SA _b of SA and the contact piece SB _b of the lower elastic conductive piece SB are in pressure contact with each other, and the switch S is connected to the electric circuit. Furthermore, this switch S is a normally closed switch in which conductive contacts SA _a and SB _a come into contact with each other due to their own elasticity, and the switch is opened when the back cover is closed. .

The back cover opening/closing detection device of this embodiment is configured as described above. Next, to explain its effect, the 9th
As shown in Figures A and B, when the back cover is opened, the protruding key 1 is separated from the opening/closing locking key 2 and the detection arm 11, so the locking key 2 is in the backward position due to its own habit, that is, the locking It is in the stop position, and the detection arm 11 is also in the first position protruding toward the back cover. Therefore, the switch opening/closing arm 12 is also separated from the detection switch S, and the switch S is on.

Next, when the camera back is closed after loading the film, etc., the protruding key 1 is first pressed, as shown in FIG. 10A.
The lower key part 1a is locked by the inclined edge of the key part 2a.
The inclined edge of the locking key 2 is pressed, and the locking key 2 moves upward against its own tendency, that is, moves forward. Further, at this time, the first pushing portion 11a of the sensing arm 11 is pushed by the pushing surface 1c, so the sensing arm 11 rotates clockwise around the central axis of the support shaft 8. When this rotates, the support shaft 8 also rotates clockwise, so as shown in FIG. 10B, the narrow diameter portion 8B of the support shaft 8
The opening/closing arm mounting portion 8b of the switch opening/closing arm 12 is separated from one inner surface that has been in contact with the other inner surface within the drum-shaped through hole 12b of the switch opening/closing arm 12, and is attached to the support shaft 8 and the switch opening/closing arm here. 12 is integrated,
As the support shaft 8 rotates, the opening/closing arm 12 also rotates clockwise.

In this way, the first pushing portion 1 is moved by the pushing surface 1c.
1a is pressed and the detection arm 11 rotates clockwise, the second pushing part 11b pushes the protruding arm 2 of the opening/closing locking key 2.
It enters the moving path of c. However, in this state, the switch opening/closing arm 12 does not yet come into contact with the conductive contact piece _SBa of the switch S, so the switch S is in the on state.

When the back cover is completely closed and the key part 1a is removed from the locking key part 2a as shown in FIG. move. When this moves back, the protruding arm 2
Since the second pushing portion 11b is pushed by the inclined edge c, the sensing arm 11 further rotates clockwise. Therefore, the support shaft 8 also continues to rotate clockwise, causing the switch opening/closing arm 12 to rotate clockwise. At this point, as shown in FIG. 11B, the switch pushing part 12a of the opening/closing arm 12 comes into contact with the conductive contact piece _SBa of the switch S.

Then, as shown in FIG. 12A, the opening/closing locking key 2
As a result of the backward movement, the locking key portion 2a locks with the key portion 1a, and the locking key portion 2b locks with the key portion 1b, so that the back cover is locked in the closed state. Further, as the opening/closing locking key 2 moves to the return position, the protruding arm 2c further pushes the second pushing part 11b, so the detection arm 11 further rotates clockwise, and the supporting shaft 8 and the switch opening/closing accordingly. By rotating the arm 12 in the clockwise direction, the conductive contact piece SB _a is separated from the conductive contact piece SA _a by the switch pushing portion 12 a. Therefore, as shown in FIG. 12B, the switch S is opened, and the signal indicating that the switch S is turned off detects that the back cover is completely closed. In addition, in this back cover closed state, the protruding arm 2c
are the first pushing part 11a and the second pushing part 1 of the detection arm 11.
1b (see FIG. 12B).

On the other hand, when opening the back cover, if you move the back cover opening knob 6 upward with your finger, the opening/closing locking key 2, the detection arm 11, and the switch opening/closing arm 12 will move in the reverse order of the above explanation. The fixed back cover of the unlocked protruding key 1 can be easily opened and the switch S
is also turned on.

In the above embodiment, the locking key part 2a is pressed by the key part 1a of the protruding key 1 fixed to the back cover, and the first pushing part 11a of the detection arm 11 is pushed by the pushing surface 1c. This may be done by separating the key part 1a and the pushing surface 1c, and forming the pushing surface 1c by a protrusion provided on the back cover, or by pushing the first pushing part 11a with the back cover itself. Of course, it is okay to do so.

Further, in the above embodiment, the opening/closing arm mounting portion 8b of the support shaft 8 is formed into an oval shape in cross section, and is inserted through the drum-shaped through hole 12b of the switch opening/closing arm 12. If the through hole 12b has a circular shape instead of a drum shape, the switch opening/closing arm 12 will rotate to the position 12A shown by the dotted line in FIG. 9B. It will end up being put away. Therefore, by making the through hole 12b into a drum shape, the rotation range is restricted, and
Space can also be saved. Further, in the above embodiment, the switch S is turned off when the back cover is closed, but the switch S may be turned on.

Furthermore, as shown in FIG. 13, in the camera 16 to which the back cover opening/closing detection device of the present invention is applied, if the gap between the camera body and the back cover 17 is waterproofed with packing 18, the support for the back cover opening/closing detection mechanism 4 is Since the shaft 8 is already waterproofed with an O-ring packing 10, it is possible to easily make the camera waterproof by simply attaching the packing 18.

[Effects of the invention] As described above, according to the invention, the movable key part and the back cover opening/closing detection member that is linked to the back cover opening/closing detection switch are configured separately, so when the back cover is opened, the movable key Even if the part is moved carelessly, the protrusion provided on the movable key part and the back cover opening/closing detection member will not engage with each other. It can be held in the on or off state. Therefore, there is no need to provide a mechanism to hold the movable key part in its moving position (forward movement position) when the back cover is open, unlike conventional ones, and the back cover opening/closing detection switch operates reliably. Therefore, the back cover opening/closing signal will not be generated erroneously, and malfunction of the camera can be prevented.

[Brief explanation of the drawing]

1 is a front view of a camera back cover opening/closing detection device showing an embodiment of the present invention, FIG. 2 is a side view of the camera showing a state in which the detection device shown in FIG. 1 is covered with a cover, and FIG. Figure 3 is an exploded perspective view of the camera back opening/closing detection mechanism, Figures 4 and 5 are perspective views showing the shape of the elastic conductive piece of the detection switch and its mounting manner, and Figure 6 is an exploded perspective view of the camera back opening/closing detection mechanism. A cross-sectional view of the detection mechanism,
Figure 7 is a rear view of the camera back opening/closing detection mechanism;
The figure is a plan view of the support shaft of the camera back opening/closing detection mechanism, FIGS. 9A, B to 12A, B are operational diagrams of the camera back opening/closing detection device of the above embodiment, and FIG. FIG. 2 is a plan view showing a cross section of the main parts of a waterproof camera to which the invention is applied. 1...Fixed key part (protruding key), 2...Movable key part (opening/closing locking key), 2c...Protruding part (protruding arm), 3...
... Camera body, 11... Back cover opening/closing detection member (back cover opening/closing detection means), S... Back cover opening/closing detection switch.

Claims (1)

[Scope of Claim for Utility Model Registration] In a camera that detects that the back cover is in the closed position with respect to the camera body and holds the back cover in the closed position, a fixed key portion having a pushing surface; and a fixed key portion provided on the camera body so as to be biased toward a position engaging with the key portion of the fixed key portion and slidable in a biasing direction and a counter-biasing direction. a locking key portion that is once retracted to a non-engaging position by the fixed key portion and then returned to an engaging position by the urging force to engage and close the back cover; and a protrusion protruding in a direction in which both of the key parts engage, the movable key being disposed at a position opposite to the protrusion of the movable key, and the movable key being in an energized state. Sometimes, the protrusion is located on the camera body side with respect to the protrusion, and when the movable key is moved in the opposite direction, the protrusion of the movable key is retracted by the pressing surface of the fixed key. When the movable key is moved to a position near the position where the movable key is moved, the locking key engages with the locking key, and the pressing force on the movable key is released, as the movable key moves in the biasing direction. A back cover opening/closing detection means that engages with the protrusion provided on the movable key part; A camera back cover opening/closing detection device comprising: a cover opening/closing detection switch;