JP2987656B2 - Camera back lid lock device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking device for a camera back cover used for a camera for photographing.

[0002]

2. Description of the Related Art As is well known, a camera is provided with a camera back cover which can be opened and closed to take in and out a film. One side of the camera back cover is hinged on one side near the back of the camera, and can be freely opened and closed. A lock claw is provided on the other side. And
The camera back lid is configured to lock or unlock the locking claw by a locking mechanism provided on the camera body and open and close the locking claw.

[0003]

The above-described lid lock of the camera back cover has a lock structure using a large number of components for the camera body and the camera back cover. Due to the design value error, a gap is generated in the camera back cover that is covered.

In particular, since the camera back cover is provided with a film pressure plate, a patrone holder, and the like, the camera back cover pressed by these components rises in the cover opening direction by the above-described gap.

As a result, when the camera is gripped and photographed, the raised camera back cover moves in the closing direction against the pressing force of the film pressure plate or the patron presser, so that mechanical backlash is felt. This causes a problem that the precision of the camera is impaired. In addition, such a floating gap of the camera back cover sometimes requires special consideration for preventing light leakage, dust prevention, and waterproofing.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to develop a locking device for a camera back cover in which no gap is formed between camera bodies when the camera body is covered.

[0007]

According to a first aspect of the present invention, a locking claw of a camera back lid that is rotatable around a shaft attachment portion as a support shaft is provided in accordance with the operation of the camera. In the lock device that locks to the main body side,
On one side of a vertically long lock plate cover attached to the camera side
Lock plate that allows pivoting and vertical movement and rotation
And give one of the vertical movement forces to this lock plate.
A spring member, and the lock plate has a spring portion.
Move in one direction with the spring force of the material and lock the lock claw on the camera back cover.
The first locking portion to be locked and the locking of the lock claw are released.
At a position where the lock plate cover is
Second to prevent the lock plate from moving in one direction due to the spring force
And a locking claw on the camera back cover.
The locking claw is locked to the portion by the first locking portion
Pushing part for releasing the locking of the second locking part prior to
While allowing up and down movement and rotation.
With the operation lever attached to the lock plate cover,
In addition, this operation lever is an interlocking part that interlocks the lock plate.
The lock plate is interlocked with the rotation of the operation lever.
Is pivoted around a pivot portion within a small range, and the first engagement
Pull the lock claw locked by the stop to the camera body side
The present invention proposes a locking device for a camera back cover having a configuration as described above. As a second invention, the shaft attachment portion is pivoted about a support shaft.
Rotate the camera back lid lock claw according to the lid movement
In a lock device that locks to the camera body, the camera
It is supported on one side of a vertical lock plate cover fixed to the side.
A lock plate that allows vertical movement and rotation
Spring part that applies one vertical movement force to the lock plate
Material, and the lock plate has a spring member
It moves in one direction with the force of the spring and locks the lock claw on the camera back cover
Moving to release the locking of the first locking portion and the locking claw.
At a position to lock part of the lock plate cover.
Second locking for preventing the plate from moving in one direction due to the spring force
And a part of the lock claw on the camera back cover
Prior to the locking claw being locked by the first locking portion
A pushing portion for releasing the locking of the second locking portion.
On the other hand, it allows vertical movement and
With an operating lever attached to the
The operation lever is provided an interlocking section for interlocking the lock plate,
The lock plate is pivoted in conjunction with the rotation of the operation lever.
Is pivoted within a small range around the fulcrum, and
Pull the locked locking claw toward the camera body, and
The lock plate is moved in conjunction with the operation of the operation lever.
Move in the other direction to release the lock pawl and release the second
The locking portion is locked.
A locking device for the camera back lid is proposed.

[0008]

[Action] Since the locking plate has a one-way movement force for locking the lock pawl, the camera back cover is operated tegmentum locking plate
Of the second locking portion is released, and the lock claw is locked by the first locking portion of the lock plate. Further, since the operating lever you move in one direction in conjunction with the move of the lock plate, by turning operation of the operation lever, pivoted in a range locking plate is small, the camera present a locking pawl engaged
Pull the camera back cover close to the camera body.
On the other hand, when the operation lever is moved in the other direction, the lock plate
It moves in the other direction against the spring force and releases the lock of the lock claw by the first locking portion . Thus, the camera back lid can be freely opened. Also, the lock plate may move in the other direction.
From the above, the second locking portion is locked to a part of the lock plate cover
Then, the lock plate is held at the moving position.

[0009]

Next, embodiments of the present invention will be described with reference to the drawings. 1A is a partial view of a camera back cover having a lock claw, FIG. 1B is a front view of a lock mechanism provided on a camera body, and FIG. 2 is a cross-sectional view taken along a line PP of FIG. 1B. It is.
FIGS. 1A and 1B show a state when the camera back cover is opened.

The camera back cover 10 has a hinge on one side near the back side of the camera body and a lock claw 11 on the other side as shown in FIG. The lock claw 11 is provided with a pushing portion 11a for releasing the locking of the return movement of the lock plate described later.

The lock mechanism is provided on the side of the camera body 20 to lock or unlock the lock claw 11 of the camera back cover 10. This lock mechanism includes a lock plate 22 between a lock plate cover 21 fixed to the camera body 20 and the camera body 20, and a lock plate cover 2
Operation lever 23 attached to 1 to enable rotation and movement
It has.

The lock plate 22 is of an elongated plate shape, and its lower side is bent into a trapezoid so as to protrude outside the lock plate cover 21. The lock plate 22 has its long hole 22 d slidably fitted to the circular projection 21 a of the lock plate cover 21 and is prevented from coming off by a screw 24. The lock plate 22 has an elastic member 25 formed of a synthetic resin material or the like.
Is fixed, and a second locking portion 25 a is provided at the tip of the elastic member 25. The second locking portion 25a can be locked to a locking receiving portion 21b formed on a part of the lock plate cover-21. Further, the lock plate 22 includes
A first locking portion 22a for locking the lock claw 11 of the camera back cover 10 is provided, and an operation lever 23 is provided at a lower end thereof.
Is provided with an interlocking pin 22b for driving the lock plate 22 by the above operation.

The lock plate 22 constructed as described above is always upwardly moved by a compression spring 26 interposed between its arm 22c and a spring hook 21c fixed to the lock plate cover 21 (see FIG. Although the moving force is applied to 1), the illustrated state is maintained by locking the second locking portion 25a to the locking receiving portion 21b. An electric brush 27 is provided on the arm 22c of the lock plate 22. The electric brush 27 slides on the surface of the double-sided printed circuit board 28 fixed to the camera body 20, and the lock plate 22 is locked in the locking direction (FIG. 1).
The electric contact pieces 29a, 29b
When the lock plate 22 moves in the unlocking direction (downward in FIG. 1), the electric connection between the electric connection pieces 29a and 29b is electrically connected.

The operation lever 23 is attached to the lock plate cover 21 with a screw 30 so as to be movable in the vertical direction (FIG. 1), and is moved upward from a second position shown in FIG. Then, it is configured to be rotatable. That is, as shown in FIG. 3, the shaft portion 23a of the operation lever 23 has a rectangular cross-section in which the thickness is formed in one direction.
3a slides within the shaft hole 21d of the lock plate cover 21 and rotates.

The shaft hole 21d of the lock plate cover 21 is shown in FIG.
As shown in a generally semi-circular hole 21d _1, and more become the elongated hole 21d ₂ that communicates with this hole 21d _1, also
The holes 21d ₁ is formed is Dangata portion 21d _3. The operation lever 23 is moved downward, and the second lever is moved as shown in FIG.
3A, the shaft portion 23a is at the position shown in FIG. 3A with respect to the shaft hole 21d. In this state, the operation lever 23 does not rotate. When the operation lever 23 is moved upward, the shaft portion 23a moves in the shaft hole 21d as shown in FIG. 3B. When the operation lever 23 moves to the first position in this manner, the shaft portion 23a can rotate as shown in FIG. 3C, so that the operation lever 23 can be rotated counterclockwise. . Incidentally, when rotates the operation lever -23 in this way, since the shaft portion 23a is engaged with the Dangata portion 21d _3, movement of the operating lever -23 is prevented.

The operation lever 23 is provided with an interlock lever-3.
1 is integrally mounted. The interlocking lever 31 moves and rotates together with the operation lever 23, and has forked tongue portions 31a and 31b formed on its arms, and a lock plate 22 is provided between the tongue portions 31a and 31b. Interlocking pin 22b
Is rushing. Further, a spring 32 having a weak spring force is hooked between the one tongue piece 31a and the spring hook 21e provided on the lock plate cover 21, and the clockwise rotation is applied to the interlock lever 31 and the operation lever 23. A rotating force is applied.

Further, a lock release button 33 is provided on the lower end side of the lock plate cover-21. The lock release button 33 is constantly applied with a projecting force by a spring 34. In FIG. 1B, the operation of the operation portion 33a is suppressed by the operation lever 23, and the protrusion 33b is provided.
Are immersed in the lock plate cover-21. When the operation lever 23 is rotated in the first position, the lock release button 33 is moved to the concave portion 23b of the operation lever 23.
And works to maintain the rotational position of the lever 23.

The cover operation and the cover opening operation of the lock device configured as described above will be described. Since the lock mechanism of the camera body 20 is in the open state as shown in FIG.
In this state, the camera back cover 10 is operated to be covered. With this cover operation, the lock claw 11 abuts against the first locking portion 22a of the lock plate 22, and the lock claw 11 and the locking portion 22
The lock plate 22 moves slightly downward (FIG. 1 (B)) by the tapering action of (a). Since this movement of the lock plate 22 causes the first locking portion 22a to retreat from the front side of the lock claw 11, the lock claw 11 further advances, and the pushing portion 11a of the lock claw 11 is moved by the advance of the lock claw 11. As shown in FIG. 4, the stopper 25a comes into contact with the second locking portion 25a, and the locking of the locking portion 25a is released from the locking receiving portion 21b.

When the locking of the second locking portion 25a is released,
The lock plate 22 moves in the locking direction (upward in FIG. 1B) by the tensile force of the spring 26, and locks the lock claw 11 with the first locking portion 22a as shown in FIG. Since the interlocking lever 31 is pulled up by the interlocking pin 22b of the lock plate 22, the operation lever 23 also moves upward and moves from the second position shown in FIG.
To the first position shown in FIG. When the operation lever 23 moves in this manner, its shaft 23a is moved to the position shown in FIG.
3B from FIG. Further, the spring 32 is
Since the pulling force is sufficiently weak as compared with the above, the lock plate 22 is extended by moving the lock plate 22 as described above. Further, when the operation lever 23 moves as described above, the protrusion 33b of the unlock button 33 is moved to the operation lever.
23 abuts on a position other than the concave portion 23b.

When the lock plate 22 moves upward as described above, the electric brush 27 slides from the position shown in FIG. 1 to the position shown in FIG. 5 to cut off the electric connection between the electric contact pieces 29a and 29b, and An electric signal indicating that the back cover 10 is in the covered state is output.

At the stage of being covered as described above, a gap of α + β is formed between the camera back cover 10 and the camera body 20 (or the lock plate cover). Here, α is the cumulative error of each component, and β is the design value error.

The operation lever 23 is rotated counterclockwise after being moved to the first position shown in FIG. In this case, the shaft portion 23a of the operation lever 23 rotates in the shaft hole 21d from FIG. 3B to FIG.
3 is prevented from descending. When the operation lever 23 is rotated, the projecting portion 33 of the unlock button 33 is rotated.
b enters the concave portion 23b, and the return rotation of the operation lever 23 is prevented.

The interlock lever 31 turns in the same direction in accordance with the turning operation of the operation lever 23, and the interlock pin 22b is pushed out by the tongue piece 31b. As a result, the lock plate 22 pivots counterclockwise within a small range around the screw 24 as shown in FIG. 6, so that the first locking portion 22a pulls the lock claw 11 toward the camera body 20 side. The camera back cover 10 is brought into close contact with the camera body 20. Fig. 7 shows the operation lever.
23 is a cross-sectional view of the lock device showing a portion 23. As shown in FIG.
The degree of close contact can be further increased by providing the. However, the elastic member 35 is not always necessary for implementing the present invention.

When the camera back cover 10 is opened, the operation part 33a of the lock release button 33 is pressed in FIG. By the pressing operation, the protruding portion 33b is immersed and the concave portion 23
In order to escape from b, the operation lever 23 is returned clockwise and rotated. When the operation lever 23 that has been turned back is moved downward and moved to the second position, the interlock lever 31 is moved.
The lock plate 22 interlocked with the lock release direction (FIG. 5)
, The lock claw 11 is disengaged from the first locking portion 22a, and the second locking portion 25a is locked to the locking receiving portion 21b.

That is, the operation sequence is as shown in FIG. 6, FIG. 5, FIG. 4, and FIG. 1, and the camera back cover 10 can be opened under the operation of FIG. When the lock claw 11 comes off the first locking portion 22a, the camera back cover 10 operates so as to be lifted from the camera body 20 by a spring force of a film pressure plate, a patrone press, or the like.

[0026] Figure 8 to form a serrated irregular portion 23c in place of the concave portion 23b of the operation lever -23, the projecting portion 33b of the lock release button 33 above embodiment to form a small protrusion 33b ₁ Example in the modification, as shown in FIG. 8 (B), there the small protrusion 33b ₁ as configured to abut on the uneven portion 23c. With such a configuration, the operation lever 23 can be rotated according to the size of the gap between the camera back cover 10 and the camera body 20 to absorb the gap. 9 forms a curved shape portion 31b ₁ to the tongue portion 31b of the interlock lever -31, there as contact configuration the curved shape portion 31b ₁ to the interlocking pin 22b, the other in the same configuration 8 and (B) is there.

In the above embodiment, since the camera back cover 10 is double-locked, the reliability is improved without opening the camera back cover 10 even when the camera is dropped or the camera is shocked. It is effective for. In addition, even with such a double lock configuration, the present invention can be implemented without increasing the cost as compared with the conventional one and without changing the shape of the camera body, which is advantageous for downsizing the camera.

In the above embodiment, since the electric brush 27 is disposed near the screw 24, even if the lock plate 22 is turned by the rotation of the operation lever 23, the electric contact pieces 29a,
9b can be reliably connected and disconnected.

[0029]

As described above, according to the lock device of the present invention, the gap between the camera body and the camera body that occurs when the camera back cover is covered can be reliably absorbed, and when the camera is grasped. The result is a precise camera with no mechanical backlash. In addition, since the camera back cover is in close contact with the camera body, the lock device is effective for light leakage, dust prevention, and waterproofing of the camera.

[Brief description of the drawings]

FIG. 1A is a partial view showing a camera back cover, and FIG.
(B) is a front view of the lock mechanism provided in the camera body.

FIG. 2 is a sectional view taken along the line PP of FIG. 1 (B).

3 (A), 3 (B), and 3 (C) are partial views showing an operation in which a shaft portion of an operation lever moves within a shaft hole of a lock plate cover and rotates.

FIG. 4 is a partial cross-sectional view of a lock mechanism showing a lock operation process when the camera back cover is operated to cover the camera body.

FIG. 5 is a partial cross-sectional view similar to FIG. 4, illustrating a locking operation process when a locking claw of a camera back cover is locked.

FIG. 6 is a partial view of the lock mechanism when the camera back lid is locked by rotating the operation lever.

FIG. 7 is a sectional view of a lock mechanism showing an operation lever portion.

FIG. 8A is a partial view similar to FIG. 6, but showing a modified example in which an operation lever is provided with an uneven portion for determining the amount of rotation. FIG. 8B is a simplified view showing a state in which the small protrusion of the lock release button abuts on the uneven portion of the operation lever to prevent the operation lever from returning and rotating.

FIG. 9 is a partial view similar to FIG. 8A showing a modified example in which a curved portion is provided on the tongue piece of the interlocking lever.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Camera back lid 11 Lock claw 11a Pushing part 20 Camera body 21 Lock plate cover 21b Lock receiving part 21d Shaft hole 22 Lock plate 22a First locking part 22b Interlocking pin 23 Operation lever 23a Shaft part 23b Concave shape Part 25a Second locking part 31 Interlocking levers 31a, 31b Tongue piece 33 Lock release button

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-161938 (JP, A) JP-A-4-212945 (JP, A) JP-A-1-136931 (JP, A) JP-A-60-1985 216342 (JP, A) JP-A-3-223738 (JP, A) JP-A-3-241329 (JP, A) JP-A-58-83830 (JP, A) JP-A-59-44030 (JP, A) Japanese Utility Model Application No. Sho 59-121642 (JP, U) Japanese Utility Model Application No. Sho 59-176022 (JP, U) Japanese Utility Model Utility Model No. 58-62334 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G03B 17/02

Claims (2)

(57) [Claims] 1. A locking device for locking a locking claw of a camera back lid, which is rotatable around a shaft attachment portion as a support shaft, to a camera body side in accordance with a cover operation, wherein a vertical portion fixed to a camera side portion.
Up and down movement supported by one side of long lock plate cover
And a lock plate that enables rotation
And a spring member for applying a moving force in one direction.
In addition, the lock plate is moved in one direction by the spring force of the spring member.
First locking portion that moves and locks the locking claw of the camera back cover
At the movement position where the lock claw is unlocked.
To lock the spring force of the lock plate.
A second locking portion for preventing movement in one direction due to
In addition, the lock claw is part of the lock claw on the camera back cover.
Prior to being locked by the first locking portion, the second
While providing a pushing portion for releasing the locking of the locking portion,
In the lock plate cover.
It has an operating lever attached, and this operating lever has
An interlocking part that interlocks the lock plate is provided, and the operation lever is turned.
The above lock plate is linked to the pivoting operation, and is less
Pivoted within the range and locked by the first locking portion.
A locking device for a camera back cover, wherein a hook is drawn to a camera body side . (2) The back of the camera that can be swiveled around the shaft attachment part
Lock the locking claw on the lid toward the camera
Lock device that locks vertically to the side of the camera.
Up and down movement supported by one side of long lock plate cover
And a lock plate that enables rotation
And a spring member for applying a moving force in one direction.
In addition, the lock plate is moved in one direction by the spring force of the spring member.
First locking portion that moves and locks the locking claw of the camera back cover
At the movement position where the lock claw is unlocked.
To lock the spring force of the lock plate.
A second locking portion for preventing movement in one direction due to
In addition, the lock claw is part of the lock claw on the camera back cover.
Prior to being locked by the first locking portion, the second
While providing a pushing portion for releasing the locking of the locking portion,
In the lock plate cover.
It has an operating lever attached, and this operating lever has
An interlocking part that interlocks the lock plate is provided, and the operation lever is turned.
The above lock plate is linked to the pivoting operation, and is less
Swivel within the range and by the first locking portion Locked lock
Pull the fingernail toward the camera body and use the operating lever
Move the lock plate in the other direction in conjunction with the
Release of the lock claw and locking of the second locking portion
The camera back cover lock
Device.