JPS6210736Y2 - - Google Patents

Description

[Detailed description of the invention] The invention is a release lock device for an electric shutter;
Specifically, in electric shutters in which at least one of the opening and closing operations of the shutter is controlled by an electromagnetic device, if normal photography cannot be taken due to low voltage or other reasons, the operation of the release member is controlled by mechanical means. The present invention relates to a release lock device that is blocked by the lock.

Conventionally, in electric shutters, when the electromagnetic device cannot function normally due to a drop in the power supply voltage, or when the subject brightness is lower than a certain level and proper photography cannot be taken, the operation of the release member is mechanically controlled. There are known release lock devices that prevent the release of the lock from occurring and issue a warning to the operator.

For example, a conventional release lock device has a structure as shown in Figure 1, and the iron piece lever has a spring behavior that acts on the electromagnetic device, so if the shutter release is inadvertently released during exposure. There was an inconvenience that the shutter remained open.

Hereinafter, a conventional release lock device will be briefly explained based on FIG.

First, under appropriate conditions, when the release plate 2 is pressed down from the shutter set state shown in the figure, a switch (not shown) is closed in conjunction with the initial operation, voltage is applied to the exposure control circuit, and the electromagnetic device 3 is activated. Power is applied. Therefore, the iron piece 5 which is crimped to the iron core 4 of the electromagnetic device by a weak spring 12
is adsorbed and held on the iron core 4 as it is. after that,
As the release plate 2 continues to be pressed down, the first cam 2
Even when the tip 6a of the warning lever 6 comes to a position facing the tip 6a of the warning lever 6, the right rotation of the warning lever 6 is prevented by the iron piece lever 7 which is held by suction. Thereafter, by continuing to push down the release plate 2, the protrusion 2b
opens and pushes the locking lever 8 to rotate it to the right, releasing the restraint on the opening/closing lever 9. Opening/closing lever 9 released from restraint
rotates to the left to open the shutter blade (not shown).

Thereafter, after a predetermined period of time has elapsed, the electromagnetic device 3 is de-energized by well-known means. As a result, the adsorption and holding of the iron piece lever 7 is released, and the warning lever 6 and the iron piece lever 7 are integrally rotated to the right by the strong spring 13. At this time, since the cam 2c of the release plate 2 faces the tip 6a of the warning lever 6, right rotation is not prevented. By turning the iron piece lever 7 to the right, the arm portion 7a pushes the closing locking lever 10 to rotate it to the left, and the locking of the closing lever 11 is released. The closing lever 11, which has been released from the restraint, rotates to the left, and the opening/closing lever 9 is reversely rotated to the right, closing the shutter blade and completing one exposure.

Next, a case where the release operation is performed under inappropriate conditions will be explained.

In this case, even if the release plate 2 is pressed down from the shutter set state and the switch is closed,
Since no voltage is applied to the exposure control circuit, the electromagnet 3 is not energized. Therefore, the iron piece 5 is not attracted to the iron core 4. Thereafter, the release plate 2 continues to be pressed down, and the first cam 2a moves to the tip 6a of the warning lever 6.
When the warning lever 6 comes to a position facing the cam 2a, the warning lever 6 is released from its restraint and rotates to the right by the spring 13 together with the iron piece lever 7, and the tip 6a enters the cam 2a. Since the depth of this cam 2a is shallow, the right rotation of the warning lever 6 is restricted, and the arm portion 7a of the iron piece lever 7 cannot push the closing locking lever 10. Therefore, the tip 6a of the warning lever 6 prevents the release plate 2 from being pressed down thereafter.

Next, a case will be described in which the release plate 2 is inadvertently released from being pressed down while the shutter is operating.

In this case, the opening/closing lever 8 is rotated to the right by pressing down the release plate 2, and after the opening/closing lever 9 starts turning to the left, the pressing down of the release plate 2 is released. restore to state. Therefore, as is already clear, even if the switch is opened by restoring the release plate 2 and the electromagnetic device 3 is de-energized, the right rotation of the warning lever 6 and the iron piece lever 7 is inhibited, and the closed lock is prevented. lever 10
is not operated. Therefore, the shutter remained open for a long time, which was inconvenient.
This inconvenience is a fundamental drawback of using a single iron lever to perform two movements (closing the blades and locking the release), and in order to solve this problem it was necessary to create a complicated structure. .

This invention was made in view of the above drawbacks.
To provide a release lock device with a simple configuration, characterized in that a shutter can be closed even if a release operation is inadvertently released during photographing.

The present invention will be explained below based on an embodiment shown in the drawings.

First, the configuration will be explained with reference to FIG. 2, which shows the state after the shutter is set.

In the figure, reference numeral 21 denotes a shutter substrate on which an aperture 21a is formed, but its outer shape is omitted. 22 is a release plate, which has a bent portion 22a,
A notch 22b is formed and the shaft is slidably guided by shafts 23 and 24 planted in the substrate 21,
The upward tendency is exerted by the spring 25, but is suppressed by the stopper. A pin 22c is installed on the release plate 22 and controls a power switch SW, which will be described later. 26 is a release lever, which includes hook parts 26a, 26b and arm parts 26c, 26.
d, is pivotally supported by the shaft 23, and the spring 2
8, the levorotatory behavior is exerted, but it is restrained by coming into contact with a stopper (not shown). Note that the hook portions 26a and 26b are formed to overlap in the direction perpendicular to the plane of the paper.

29 is a set plate, which includes a bent portion 29a and a locking portion 29.
b. Forming the pressing part 29c, a shaft 30 mounted on the substrate, and also slidably guided by the shaft 31, and a rightward force is applied by a charged spring 32, as described below. The control lever 33 is restrained by coming into contact with the bent portion 33b.

33 is a control lever, which includes an arm portion 33a and a bending portion 33.
The iron piece 35a of the iron piece lever 35, which will be described later, is an electromagnetic device.
It comes into contact with the Mg iron core and is restrained.

35 is an iron piece lever, an iron piece 35a, a bent part 35
b, forming a lock portion 35c, and locking the control lever 33;
The release plate 22 is pivoted on the arm 33a by a shaft 36, and a spring 37 applies a right turning force, but the lock 35c comes into contact with the side surface of the release plate 22 and is restrained. Note that when the control lever 3 is set, the iron piece lever 35 is prevented from turning to the right, so that the iron piece 35a is rotated by the right turning force of the control lever 33 as described above. It is crimped onto the core. Here, the iron piece 35
a is arranged between the shaft 31 and the pivot shaft 36.

Reference numeral 38 denotes a hold lever, which forms an arm portion 38a, is pivotally supported by the shaft 31, and is given a left turning force by a charged spring 39, but is restrained by the hook 26a of the release lever 26. has been done. Note that one end of the spring 39 is fixed on a second substrate (existing parallel to the upper side of the paper) not shown.

41 is an opening/closing lever forming a locking portion 41a;
The interlocking pin 41b and the restoring pin 41c are installed, and the spring 43 is supported by the shaft 24 and charged.
A left turning force is applied by the locking portion 4.
1a comes into contact with the hook 26b of the release lever 26 and is restrained. The interlocking pin 41b is interlocked with a shutter blade (not shown) to open and close it.

In this case, the shutter blade is usually composed of two blades, each of which rotates in opposite directions.
Furthermore, each blade is divided into two parts, so that the timing of starting operation is different.
This slows down the opening operation of the shutter blades,
This is to obtain appropriate aperture characteristics. In other words, it is composed of a first blade that operates in conjunction with the left rotation of the opening/closing lever 41 immediately, and a second blade that operates in conjunction with a slight delay.When the second blade operates in conjunction, the left rotation of the opening/closing lever 41 is delayed. This means that For this purpose, the interlocking hole of the second blade (interlocking pin 41
(b) is made larger than the interlocking hole of the first blade, and the spring behavior of restoring is applied to the second blade.

SW is a power switch connected to a well-known control circuit (not shown), and in the set state shown in the figure, it is open and the control circuit is cut off.

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

First, a case will be described in which the release lock mechanism is activated due to a drop in power supply voltage or the like.

When the release plate 22 is pressed down from the set state shown in FIG. 2, the pin 22c presses the switch PW by its initial action to close the switch.

However, in this case, the power supply voltage is low, so normal operation is not performed, and the electromagnetic device Mg is not energized. Therefore, although the iron piece 35a is crimped to the iron core, it is not attracted.

In this state, when the release plate 22 is further pushed down, the bent portion 22a is moved to the release lever 26.
Immediately before pressing , the notch 22b touches the lock part 3
In order to come to a position opposite to 5c, iron piece lever 35
is rotated to the right by the spring 37, and the lock portion 35c enters the notch 22b. Therefore, even if an attempt is made to push down the release plate 22 further, the pushing down is prevented. This situation is shown in FIG.

When the release plate 22 is prevented from being pressed down, the operator notices that there is an abnormality in the electric shutter.
By releasing the depression of the release plate 22, the release plate 22 slides upward by the restoring force of the spring 25 and returns to its original state.

Next, the operation when the power supply voltage etc. are normal will be explained.

When the release plate 22 is pushed down from the set state shown in FIG. 2, the switch SW is closed in the same manner as described above, the control circuit is activated, the electromagnetic device Mg is energized, and the iron piece 35a is attracted to the iron piece in the crimped state.

After that, push down the release plate 22 further,
Even when the notch 22b comes to a position facing the lock portion 35c, the iron piece lever 35 is prevented from rotating to the right by the attraction of the iron piece 35a. Therefore, pressing down of the release plate 22 is not prevented. As the release plate 22 is subsequently pushed down, the bent portion 22a pushes the arm portion 26c of the release lever 26 to rotate it to the right, releasing the hold lever 38 and the opening/closing lever 41 from being restrained.

The unlocked opening/closing lever 41 is rotated to the left by the spring 43, the shutter blade is opened via the interlocking pin 41b, and the aperture 21a is opened.

On the other hand, hold lever 3 was released from the restraint at the same time.
8 tries to turn left by the spring 39, but at this time, the iron piece 3 has already been energized by the electromagnetic device Mg.
5a is adsorbed to the iron core, so the bent part 33c
It comes in contact with and is restrained. Then, when the hold lever 38 comes into contact with the bent portion 33c, a left rotation force is applied to the control lever 33.
This condition is shown in FIG.

Thereafter, when a predetermined period of time has elapsed, the control circuit operates to cut off the power to the electromagnetic device Mg, and the electromagnetic device is demagnetized. Therefore, the control lever 33 is
Due to the restoring force, it rotates to the left through the bending portion 33c. Due to this left rotation, the bent portion 33b is
9 is released, and the set plate 29 begins to slide rightward by the restoring force of the spring 32. The left rotation of the control lever 33 is limited by contact with a stopper, and the right rotation of the iron piece lever 35 by the spring 37 is limited by contact with the side surface of the release plate 22. This condition is shown in FIG.

At the final stage of the subsequent slide of the set plate 29, the pressing part 29c presses the restoring pin 41c,
The bent portion 29a presses the arm portion 38a. and,
When the restoring pin 41c is pressed, the opening/closing lever 41 is reversely rotated to the right, closing the shutter blade and completing one exposure. Further, by pressing the arm portion 38a, the hold lever 38 is rotated to the right. By turning the hold lever 38 to the right, a right turning force acts on the control lever 33 via the spring 34, and although the control lever 33 rotates slightly to the right, the bent portion 33b does not touch the set plate 29.
The vehicle is restrained by contacting the side of the vehicle. This state is shown in FIG.

The above operation is an explanation of the case where the electromagnetic device Mg demagnetizes and closes the shutter blade after the shutter blade is fully opened, but unlike this, the electromagnetic device Mg demagnetizes and closes the shutter blade while the shutter blade is opening. In some cases.

Furthermore, the above is a case where the depression of the release plate is maintained until the end of exposure, but next we will explain the case where the depression of the release plate is inadvertently released while the shutter blade is open.

In this case, the release plate 22 is released from being pressed down before the electromagnetic device Mg is demagnetized from the state shown in FIG. 4, and the shutter blade is released.

Therefore, when the release plate 22 is released from the state shown in FIG.
It slides upward due to the restoring force of the switch.
PW opens. This opening of the switch SW is performed after the notch 22b passes a position opposite to the lock portion 35c of the iron piece lever 35. When the switch SW is opened, the control circuit is cut off and the electromagnetic device Mg is demagnetized. Furthermore, the upward slide of the release lever 22 releases the pressure on the release lever 26, and the release lever 26 attempts to rotate to the left. However, at this time, the arm portion 26d is in contact with the opening/closing lever 41, and its left rotation is inhibited. Therefore, even when the release lever 22 is restored, the hold lever 38 is not restrained, and a left rotation force is applied to the control lever 33.

Therefore, when the release lever 22 is restored to its original state, the power switch SW is opened and the electromagnetic device Mg is demagnetized, and the control lever 33 is rotated to the left by the spring 39. By this left rotation, the restraint of the set plate 29 is released, and it slides to the right in the same manner as described above, thereby restoring the hold lever 38. At the same time, the opening/closing lever 41 is turned clockwise to close the shutter blade. Then, at the final stage of clockwise rotation of the opening/closing lever 41, the contact with the release lever 26 is released, and the release lever 26 is released.
rotates to the left, and the hook portions 26a and 26b enter the left-handed rotation locus of the hold lever 38 and opening/closing lever 41.

Finally, the shutter setting operation will be explained.

When the set plate 29 is slid to the left in preparation for the next photograph from the photographing completion state shown in FIG. 6 (the release plate 22 and release lever 26 are already in the state shown in FIG. 2), the opening/closing lever 41 and the hold lever are 38 is released, and each lever becomes restrained by the hook portions 26a, 26b of the release lever 26. Thereafter, as the set plate 29 slides to the left, the control lever 33, which is released from the restraint on the side surface of the set plate 29, rotates to the right by the restoring force of the spring 34, and the bent portion 33b moves to the right of the set plate 29. Enter the trajectory of the direction slide. On the other hand, by turning the control lever 33 to the right, the iron piece 35 of the iron piece lever
A is crimped to the iron core of the electromagnetic device Mg. and,
After that, if the setting force of the setting plate 29 is released,
The setting plate 29 returns slightly to the right and is restrained by the bent portion 33b of the control lever 33, completing the setting operation. This set state is shown in FIG.

The above is a description of the configuration and operation of one embodiment of the present invention, but it goes without saying that the present invention is not limited thereto.

For example, in the above-described embodiment, a configuration in which the release plate is directly locked has been described, but the present invention is not limited to this, and a member related to the opening operation of the shutter may be locked.

Since the present invention has the above-mentioned configuration, despite its extremely simple configuration, it is possible to reliably lock the shutter release even when the power supply voltage drops or the subject brightness is lower than a certain level. There is an effect that it can be done.

Furthermore, even if the shutter release state is inadvertently released during photography, the shutter can be closed, so there is no inconvenience caused by leaving the aperture open.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the set state of the conventional example, FIG. 2 is a plan view of the set state of an embodiment of the present invention, and FIG.
4, 5, and 6 are explanatory diagrams of the operation of FIG. 2, respectively. 22...Release plate, 22b...Notch, 26
... Release lever, 29 ... Set plate, 33 ... Control lever, 34 ... Spring, 35 ... Iron piece lever,
35a...iron piece, 35c...lock part, 37...
Spring, 38...Hold lever, 39...Spring,
41... Opening/closing lever, Mg... Electromagnetic device, SW...
Power switch.

Claims (1)

[Claims for Utility Model Registration] A release-related member for controlling the opening of the shutter, an electromagnetic device for controlling the closing timing of the shutter, a closing control lever member on which a spring action acts on the electromagnetic device, and a shutter release member for controlling the shutter release. a holding member which is unlocked by a later operation and causes the closing control lever member to have a spring behavior in a direction away from the electromagnetic device; a holding member pivotally held on the closing control lever member and having an iron piece at one end; It has a lock part at the other end, and has a spring behavior in the direction of moving away from the electromagnetic device, but in the shutter set state, the release-related member prevents the release-related movement, and the iron piece is crimped to the electromagnetic device. an iron piece lever member, and when the electromagnetic device is not energized during the initial operation of the shutter release, the iron piece lever member is activated by the spring behavior when the release-related member is released from the restraint. A release lock device for an electric shutter, wherein the release lock device is moved away from the electromagnetic device, and the lock portion prevents the release-related member from operating.