JPS6023334B2 - Camera shutter release safety device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shutter release safety device for a camera having a shutter speed priority exposure control mechanism.

Furthermore, the present invention relates to a shutter release safety device for checking the depth of field during camera photography.

Cameras that have an aperture control mechanism that automatically controls exposure to provide appropriate exposure by arbitrarily setting photographic conditions such as subject brightness, film sensitivity, and shutter speed have two main control methods for the aperture interlocking member.

One is a method in which the aperture interlocking member of the aperture control mechanism drives the aperture signal section against the elastic force of a spring member disposed on the aperture ring of the lens section.

Another method is to drive the aperture signal member using elastic force such as tension or pressing force of a spring member disposed on the aperture ring of the lens.

The former has the disadvantage that the camera winding torque increases because the aperture interlocking member controls the aperture signal member, requiring a spring member with stronger elastic force to resist the elastic force of the spring member disposed on the aperture ring. have.

The latter method utilizes the elastic force of a spring member disposed on the aperture ring to control the aperture signal member, so it has the advantage that the winding torque of the camera can be small.

However, in the latter method, after the film winding is completed and the shutter charging is completed, the aperture interlocking member resists the spring member disposed on the aperture ring inside the lens unit and moves to the open aperture position (
When checking the depth of field after charging the shutter, the aperture linking member is unlocked, and the aperture linking member is locked again when performing automatic exposure shooting after checking the depth of field. It is necessary to lock the member in the open aperture position (or the maximum aperture position).

In this case, if the operator accidentally presses the shutter release nail while re-engaging to perform automatic exposure shooting after confirming the depth of field, the aperture linking member will move to the open aperture position (or minimum aperture position).
Since the aperture control mechanism is not engaged, that is, the aperture control mechanism is not activated, there is a risk that proper exposure will not be achieved. The present invention aims to solve the above-mentioned drawbacks of a camera in which the aperture signal member is controlled by the aperture interlocking member using the elastic force of the spring member disposed in the aperture ring of the shutter release member. This is to prevent manipulation.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 shows a state in which film winding is completed and shutter charging is completed. In the figure, 1 is a camera body part, 2 is a lens part, and 3 is an aperture ring. 4, it is urged to rotate downward. The aperture ring 3 has a protrusion 3b, and the aperture preset ring 5
It is possible to engage with the protrusion 5a of. 6 is the aperture interlocking plate inside the camera and fixing pin 7. - 72 allows it to slide along the long grooves 60 and 6Q.

Reference numeral 8 denotes a spring member for causing the sliding movement of the aperture interlocking plate 6 to follow the aperture signal member 3a, and its elastic force is weaker than that of the spring member 4.

Reference numeral 6a denotes an engaging protrusion of the aperture interlocking plate that engages the aperture signal plate 3a and the aperture interlocking plate 6, and 9 is a contact piece member integrally provided on the aperture interlocking plate 6, which is disposed on the main plate (not shown). installed resistance 1
0 in conjunction with the sliding movement of the aperture interlocking plate 6 to change the resistance value.

Reference numeral 11 denotes a lever that can be engaged with a ratchet portion 6c of the aperture interlocking plate 6, and is rotatable around a pin 12 arranged on a base plate (not shown), and is biased to rotate counterclockwise by a spring member 13.

The magnet 14 is a magnet for locking the lever bar 11.

Reference numeral 15 denotes a lever for stopping the aperture interlocking plate, which is rotatable around a pin 16, is urged to rotate clockwise by a spring 17, and its operation is controlled by excitation of an electromagnetic release magnet Mg shown in FIG.

The lever 15 for locking the aperture interlocking plate can be locked with the locking portion 6a of the aperture interlocking plate when the aperture interlocking plate 6 is at the top as shown in FIG.

Reference numeral 18 denotes a film winding member that interlocks with a film winding mechanism (not shown); 19 a re-locking member that re-locks the aperture interlocking plate 6 to the open aperture position (or minimum aperture position) after confirming the depth of field; and 20 a re-locking member This is a switch operated by an operating member 19.

A portion of the operating member 19 protrudes outside the camera body 9 and can be manually operated from the outside, or it can be built into the camera and operated automatically using an electromagnetic mechanism or the like.

Next, the operation of the present invention illustrated in FIG. 1 will be explained.

The aperture interlocking plate 6 is operated by the winding material 18 which is linked to the winding mechanism by the winding operation of the film winding lever (not shown).
is pushed up against the elastic force of the spring section 4 stretched over the aperture signal section 3a in the upper direction of the camera, and the aperture interlocking plate 6
The locking portion 6d and the aperture interlocking plate locking lever 15 engage with each other. In this case, the magnet 14 is energized and the lever 11 is disengaged from the ratchet portion 6c of the aperture interlocking plate. Peeling piece member 9
is located at the top of the resistor 10, and the resistance value of the resistor 10 is the maximum value. When the film winding is completed, the film winding material 18 returns to the position shown by the one-dot chain line.

When the shutter is released, the locking portion 6d of the aperture interlocking plate and the aperture interlocking plate locking bar 15 are disengaged by the operation of an electromagnetic release mechanism (not shown). The spring member 4 has a stronger elastic force than the spring member 8 that tensions the aperture interlocking plate 6 toward the upper part.
As a result, the diaphragm interlocking plate starts to descend. When the aperture interlocking plate 6 descends to a position with photographic conditions (appropriate aperture value) suitable for the photographic information (subject brightness, film sensitivity, shutter speed, etc.), resistance is exerted by the lowering of the reinforcement member 9 integrally formed with the aperture interlocking plate 6. The resistance value of the body 10 is detected, the magnet 14 is demagnetized by the action of a control circuit (not shown), the lever 11 is engaged with the ratchet portion 6c of the aperture interlocking plate by the action of the spring member 13, and the lowering of the aperture final plate 6 is stopped. , sprouting control is performed.

When checking the depth of field after film winding is complete and the shutter is charged, the aperture ring of the lens must be rotated freely, and the aperture movement plate locking bar 15 must be engaged with the aperture interlocking plate 6. For example, it is necessary to separate the diaphragm operation member 22 in FIG. 1 to release the diaphragm interlocking plate 6 below the camera body.

If you release the engagement of the bar 15 by locking the iris interlocking plate 6 and the aperture interlocking plate and then releasing the shutter after checking the depth of field, you will not be able to obtain an appropriate aperture, so the iris interlocking plate 6 and the iris interlocking plate will be locked again. It is necessary to engage the bar 15 to enable automatic sprouting control.

To do this, as described above, the winding member 18, which moves in the film winding mechanism due to the film winding operation, locks the aperture interlocking plate 6 and the aperture interlocking plate, thereby locking the bar 15. They get rolled up together. In the present invention, an operating section 19 is provided to re-engage the aperture interlocking plate after confirming the depth of field, so that the aperture interlocking plate can be easily reengaged.

The position of the operating member 19 indicated by the dotted line in FIG.
The figure shows a state in which the aperture movement plate is locked and re-engaged with the lever 15. However, if the operator accidentally releases the shutter when the operating part 19 is not in the position shown by the solid line, the aperture movement plate will be re-engaged. Since the interlocking plate 6 is obstructed by the operation section 19, proper exposure control cannot be performed.

Therefore, it is necessary to provide a safety device that prevents the shutter release from operating when the operating member 19 is not at the position indicated by the solid line in order to prevent improper exposure. FIG. 2 shows an example of a circuit diagram of a safety device.

In FIG. 2, SW2 is a switch that is interlocked with the release of the rice roll, SW2 is a switch that indicates the completion of winding, and SW3 is a switch that is operated from contact 2 when the operating member 19 shown in FIG. 1 is in the position shown by the solid line. E indicates a power source. Mg
C is the electromagnetic release magnet of the aperture interlocking plate regulating means, C,
is a Mg power supply capacitor, R is a charging resistor, Tr is a Mg current control transistor, R2 and R3 are resistors, C
2 is a capacitor. In the figure, switches SW,
, SW2, and SW3 are turned on, the current charged in the Mg spring capacitor C, flows through Mg, and the Mg
is actuated by suction, the bar 15 locking the aperture interlocking plate is rotated counterclockwise, and the engagement with the aperture interlocking plate is released, thereby performing proper budding control.

When the operating member 19 is aligned with the solid line in Fig. 1 and the SW is set to SW30N, and the shutter release is turned on when the winding completion switch SW20N is turned on, the circuit shown in Fig. 2 is configured and the aperture interlocking plate locking lever 15 and counterclockwise are turned on. Rotate in the direction to enable automatic exposure control.

When the operating member 19 is in the position indicated by the dotted line in Figure 1, SW3 is turned OF.
F is reached and the operator accidentally presses the shutter release nail.
Even if W, ON' is turned off, the circuit shown in FIG. 2 is not configured, and the lever 15 for locking the aperture interlocking plate is not closed and any deliberate operation is prevented. As described above, the present invention provides an aperture interlocking plate that operates in conjunction with the aperture mechanism in an automatic exposure control camera that controls exposure by driving the aperture signal member 3a using the elastic force of the spring member 4 disposed in the aperture mechanism. By providing an operating member 19 for controlling the angle of view 6 and a signal member 10 controlled by the operating member 19, it is possible to prevent erroneous operations after the 0-degree field of view confirmation operation.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram. Evening 3...Aperture ring, 5...Aperture preset ring,
4, 8, 13, 17... Spring member, 6...
...Aperture interlocking plate, 15...Aperture interlocking plate locking lever, M
g... Electromagnetic release magnet for controlling the lever for locking the aperture interlocking plate, 18... Winding member, 19...
...0 operation member. Figure 7 Figure 2

Claims (1)

[Claims] 1. In a camera in which an aperture interlocking member is actuated by the biasing force of a spring provided in an aperture mechanism on the photographing lens side, a locking member for locking the aperture interlocking member at an initial position is provided, and the locking operation of the locking member is provided. a depth confirmation member that releases the shutter independently of the release operation, and a re-operation member that locks the aperture interlocking member to the locking member irrespective of the winding operation, and is interlocked with the operation of the re-operation member. 1. A shutter release safety device for a camera, characterized in that the signal member prohibits a release operation by its operation.