JPS6226742Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is a locking device for a blade driving member in an electric shutter, specifically, in an electric focal plane shutter equipped with a quick-return type mirror, the blade is attracted by an electromagnet. Reducing the spring load of the locking device for the shutter blade drive member, which releases the lock of the shutter blade drive member to enable the shutter blade to operate, and then locks the shutter blade drive member again after the shooting is completed, which is restored by the shutter set operation. Regarding.

For example, a conventional locking device for a blade driving member has a first
As shown in the figure, when the locking lever 2 forming the iron piece portion 2a is attracted by the electromagnet 3 and rotates to the right against the force of the spring 4, the bent portion 2b releases the engagement with the hook 5a. As a result, the drive lever 5, which is released from the restraint, is rotated to the left by the spring 6 and operates the shutter blade via the pin 5b. Then, when the shutter is set after the photographing is completed, the drive lever 5 is rotated to the right from the position shown by the two-dot chain line against the spring 6, and at the final stage, the rear surface of the hook 5a pushes against the bent portion 2b and the locking lever 5 is rotated to the right. 2 (which has already returned to its left rotation due to the demagnetization of the electromagnet 3) is rotated to the right, and finally the state shown in FIG. 1 is set.

However, in the configuration of the conventional example described above, since the electromagnet 3 of the locking lever 2 is attracted against the spring 4, an electromagnet that can obtain a large attractive force is required, which increases the size of the device, which is undesirable. Ta.

The present invention was devised in view of the above-mentioned drawbacks of the prior art, and it is an object of the present invention to provide a locking device that can sufficiently attract even a small electromagnet.

An object of the present invention is to provide a locking lever member as a double lever type consisting of a first lever forming an engaging part of a drive member and a second lever forming an iron piece part. This is achieved by only connecting the lever with a very weak spring, eliminating the need for any other springs, and instead controlling the lever in conjunction with the up and down movements of the mirror.

That is, when the shutter is set, the second lever is locked to the mirror in the down state, so the drive member can be locked in the set position while only the first lever is rotated against the restoring spring. . Also, when shooting starts, the mirror goes up and the second lever is unlocked, so the second lever and the first lever are attracted by the electromagnet and rotate as a unit to control the driving member. Release the lock.

During this suction, no resistance to the suction rotation acts.

The present invention will be described below based on one embodiment shown in the drawings.

First, the configuration will be explained with reference to FIG. 2 showing the shutter set state.

In the figure, reference numeral 12 denotes a locking lever (first lever member) for the leading blade, which forms a bent portion 12a and is pivotally supported by a shaft 13 that is set up on the plate 11. A left turning force is applied by a spring 14 mounted between the two, but it is restrained by contacting a stopper 15.

Reference numeral 16 denotes an iron piece lever (second lever member) for the leading blade, which forms bent portions 16a, 16b and an iron piece 16c, is pivotally supported by the shaft 13, and is given a right turning force by the spring 14. However, it is restrained by coming into contact with a bent portion 45a of a lock lever 45, which will be described later.

18 is a drive lever for the leading blade, and the hook part 18
a and a pin 18b that interlocks the leading blade, and a shaft 19 that is set on the plate 11.
The hook portion 18a engages with the bent portion 12a and is restrained, although a levorotatory driving force is applied by the spring 20. 21 is a stopper.

Reference numeral 22 designates an electromagnet for the leading blade, which is composed of an iron core 23 and a coil 24, and the iron core 23 is fixed to the plate 11.

Reference numeral 32 denotes a locking lever (first lever member) for the rear blade, which forms a bent portion 32a, and is connected to the plate 11
The spring 3 is supported by a shaft 33 installed in the spring 3, and is mounted between the iron piece lever 36 described later
4 exerts a left-turning force, but it comes into contact with the stopper 35 and is restrained.

Reference numeral 36 denotes an iron piece lever (second lever member) for the rear blade, which forms bent portions 36a, 36b and an iron piece 36c, is pivotally supported by the shaft 33, and is given a right turning force by the spring 34. However, it is restrained by coming into contact with a bent portion 45b of a lock lever 45, which will be described later.

38 is a drive lever for the rear blade, and the hook part 38
a and a pin 38b that interlocks the rear blades, and a shaft 39 that is set on the plate 11.
The hook portion 38a engages with the bent portion 32a and is restrained, although a levorotatory driving force is applied by the spring 40. 41 is a stopper.

Reference numeral 42 denotes an electromagnet for the rear blade, which consists of an iron core 43 and a coil 44, and the iron core 43 is fixed to the plate 11.

45 is a lock lever with bent parts 45a and 45b.
It is rotatably attached to a mirror box 47, which will be described later, via a rotation shaft 48, which will be described later.

Reference numeral 47 denotes a mirror box, which has a window 47a (FIG. 6) formed in its side plate, is arranged on the plate 11, and includes a rotating shaft 48, a mirror 49 fixed to the rotating shaft 48, and a mirror 49 fixed to the rotating shaft 48. It is composed of a pin 50 set up on the side surface and a spring 51 wound around the rotating shaft 48. As shown in FIG. 6, the mirror 49 is pushed by one end of the spring 51 and is inclined at approximately 45 degrees, and constitutes a part of the finder optical system.

Next, the operation of the above configuration will be explained.

First, when the shutter button is pressed from the state shown in FIG. 2, the mirror 49 goes into the up state as shown in FIGS.
Rotate to the left in conjunction with 9. As a result, the bent portion 45
a, 45b retreats to release the pressure on the bent portions 16b, 36b, and the iron piece levers 16, 3 are released from restraint.
6 are rotated to the right by springs 14 and 34, respectively. Then, the bent portions 16a and 36a are respectively connected to the locking lever 1.
2 and 32, right rotation is inhibited. This state is shown for the iron piece lever 16 by a two-dot chain line, and for the iron piece lever 36 by a solid line.

Then, when the switch is operated in conjunction with the subsequent depression of the shutter button, the electromagnet 22 is energized in pulses and is instantaneously energized.
aspirate. This suction causes the iron piece lever 16 to rotate to the right, and the bent portion 16a pushes the locking lever 12 to rotate it to the right, releasing the engagement between the hook 18a and the bent portion 12a. As a result, the drive lever 18 is rotated to the left by the spring 20, actuating the leading blade via the pin 18b. Therefore, the aperture is opened and exposure begins. The state at this time is shown in FIG.

After that, when the proper exposure time has elapsed, the electromagnet 42 is pulse-energized and momentarily becomes energized, attracting the iron piece 36c and rotating the iron piece lever 36 to the right, as shown by the two-dot chain line in FIG. let
This right rotation causes the bent portion 36a to move towards the locking lever 32.
Push to turn it to the right, and then remove the hook 38a and the bent part 32a.
disengage. As a result, the drive lever 38 is rotated to the left by the spring 40, operating the rear blade via the pin 38b. Therefore, the aperture is covered and one exposure operation is completed.

When the iron piece lever 36 is attracted by the electromagnet 42 and rotates to the right, it comes into contact with the iron core 43 and stops, but the locking lever 32 slightly overruns and charges the spring 34. Therefore, the locking lever 32 is then rotated to the left by the spring 34, comes into contact with the stopper 35, and is stopped. At this time, the iron piece lever 36 is also pushed and rotated to the left. The state at this time is shown in FIG. Locking lever 12 for leading blade, iron piece lever 16
The same applies to

On the other hand, the mirror 49
rotates to the right and enters the down position (Fig. 6). Then, in conjunction with the right rotation of the mirror 49, the lock lever 4
5 is also right-handed, and the bent portions 45a and 45b are the bent portions 16.
b, 36b to lock the iron levers 16, 36 while rotating them to the left. As a result, the iron levers 16 and 36 are restrained by the stoppers 17 and 37 and the bent portions 45a and 45b, respectively, and cannot be rotated to the right or to the left. The state at this time is shown in FIG.

When the film winding and shutter setting operations are performed after photographing, the drive levers 18 and 38 are rotated to the right against the springs 20 and 40, and the hook portion 18 is turned to the right in the final stage.
The rear surfaces of the levers 12a and 38a press against the bent portions 12a and 32a, causing the locking levers 12 and 32 to rotate clockwise and slightly overrun. After the drive levers 18, 38 overrun, the locking levers 12, 32
4 and 34, respectively, to return to left rotation.

Then, when the setting force is released, drive lever 1
8, 38 are reversed and rotated to the left, but the hook portions 18a, 38
a is engaged with and restrained by the bent portions 12a and 32a,
The set state shown in FIG. 2 is reached.

The above is an explanation of the embodiment of the locking device according to the present invention, but it goes without saying that the present invention is not limited to this embodiment, and various changes can be made in implementation.

As mentioned above, in this invention, the locking lever is a double lever type, connected by a weak spring, and the locking lever is locked in the locking position by a locking member that operates in conjunction with the up and down movements of the mirror. Because of this structure, when the lock by the lock member is released, no resistance acts on the locking lever, so the attraction force by the electromagnet can be small. Since the locking lever is locked, the restraint of the locking lever will not be released by mistake due to vibration or the like, and therefore, there is an effect that malfunction of the drive lever is prevented.

[Brief explanation of the drawing]

Figure 1 is a plan view illustrating the outline of a conventional example;
The figure is a plan view of an embodiment of the present invention, FIGS. 3 to 5 are plan views explaining the operation of FIG. 2, and FIG.
FIG. 7 is a left side view illustrating the operation of FIG. 6. 12, 32... Lock lever (first lever member), 14, 34... Spring, 16, 36... Iron piece lever (second lever member), 18, 38... Drive lever, 22, 42... ...Electromagnet, 45...Lock lever, 47...Mirror box, 49...Mirror.

Claims (1)

[Scope of Claim for Utility Model Registration] A shutter blade drive lever member, a locking lever member that locks the drive lever member in a set position, and a locking lever member that locks the drive lever member by suctioning the locking lever member. An electric shutter equipped with an electromagnetic device that controls exposure by releasing the shutter, and a quick return mirror device that goes into an up state prior to the start of exposure and goes down in conjunction with the end of exposure, a first lever member forming a locking portion that locks the drive lever member;
An iron piece is formed that is attracted to the electromagnet device, and engages with the first lever member in the movement direction of the electromagnet device and before contacting the electromagnet device, and The first lever member is configured in a double lever type with a second lever member that integrally moves the first lever member in the direction of releasing the lock from the drive lever member by the movement of the first lever member being displaced in the direction of being attracted and abutting, and A spring is hung between the first lever member and the second lever member, and further, the second lever member is connected to the mirror device in the down state. By being pushed by the moving member, it is restrained to a non-attraction position with respect to the electromagnet device, but when the mirror device is displaced to the up state, the pushing movement is released and it is placed in a state where it can be attracted by the electromagnet device. Furthermore, when the second lever member is in the inhibited state, the spring moves the first lever member to the locking position with respect to the drive lever member via the second lever member. A locking device for a blade driving member, characterized in that it is towed.