JPS6136982Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a so-called electric shutter in which the shutter closing timing is controlled by an electromagnetic device. This invention relates to an electric shutter that locks the opening/closing operation of the shutter when the shutter is released when the voltage of the battery, which is the driving force source of the device, has decreased to such an extent that the device cannot be operated effectively.

In the above-mentioned electric shutter, that is, in a shutter where the shutter closing timing is controlled by an electromagnetic device, if the battery voltage decreases, the shutter speed becomes inaccurate, and in the case of an electromagnetic release shutter, the shutter speed becomes inaccurate. This causes inconveniences such as the timing of opening becoming inaccurate.

In order to deal with inconvenient situations such as those mentioned above,
In the past, methods have been proposed or implemented, such as displaying the battery voltage drop in the viewfinder, or using mechanical means to maintain a constant shutter speed regardless of the brightness of the subject. The former method described above requires a special circuit or device for displaying the information in the viewfinder, which increases complexity and costs. Moreover, with the latter method, you cannot tell what time it is when the shutter speed is switched to the mechanical shutter speed, so you may be shooting at an inappropriate shutter speed, and you may not know what time it is. This would have caused inconveniences such as not knowing about it.

In view of the above, the present invention is based on an electric shutter equipped with an electromagnetic release device, in which when the voltage of the battery decreases and the magnet no longer functions satisfactorily, the shutter release operations for both opening and closing of the shutter are disabled. As a result, in the case of single-lens reflex cameras, the mirror remains raised and a drop in battery voltage is detected, and in other cameras, there is no sound of the shutter opening and closing, and the next This condition can also be detected by the inability to charge the shutter, and in other words, when the release is operated when the battery is insufficient, the release member is locked in the middle of operation, and the shutter does not open or close at the same time. To provide an electric shutter which can be restored to the state before the release operation by an extremely easy operation when the situation occurs, and can immediately start photographing by charging the shutter again after replacing the battery.

Hereinafter, the present invention will be explained with reference to illustrated embodiments.

In FIGS. 1 to 3, 1 is pivoted by a shaft 2, given levorotation by a spring 3, has a protrusion 1a, and moves to position 4' in conjunction with the unlocking operation. A lock release lever 5 is pivotally connected to a shaft 6, and a spring 7 imparts dextrorotation. The operation of the lock lever 8, which has an arm 5a, a hook 5b forming surfaces A and B, and an arm 5c whose tip engages with the projection 1a, is controlled by an electromagnetic release circuit (not shown). 9 is a closed release magnet whose operation is controlled by an exposure control circuit (not shown);
10 is pivotally connected by a shaft 11, is given levorotation by a spring 12, and has arms 10a, 10b, 1
0c, a corner portion 10d, and a protrusion 10e forming surfaces c and d are integrally formed, and the iron piece 13 attracted to the opening release magnet 8 can freely move forward and backward, but is protruded by the iron piece spring 14. An opening release magnet lever 15 is pivoted by a shaft 16 and is given levorotation by a spring 17.
Arm 15b that engages with 0b, the above-mentioned arm 5
A protrusion 15c forming a surface e that engages with a is integrally formed, and the iron piece 18 attracted to the closing release magnet 9 is urged to protrude by an iron piece spring 19, although it can freely move back and forth. The closing release lever 20 is pivotally connected by a shaft 21, given left-handed rotation by a spring 22, limited in its left-handed rotation by a stopper pin 23, and has a hook 20a that engages with the aforementioned corner 10d. The release start lever 24 is pivotally connected by a shaft 25, given left rotation by a spring 26, and restricted from left rotation by a stopper pin 27.
An opening release lever 28 having an opening drive spring 29 is energized by an opening drive spring 29, and the opening release lever 28 has a
an opening drive member that engages with a and locks its operation;
30 is pivotally connected by a shaft 31, is given levorotation by a spring 32, its left rotation is controlled by a stopper pin 33, and its operation during right rotation is controlled by another stopper pin 34. , Mage 30a, Mage 3 that engages with the arm 15a described above.
A closing release lever 35 having a diameter of 0b is energized by a closing drive spring 36 and is
a closing drive member that engages and locks its operation;
Reference numeral 37 is a stopper pin that limits the right rotation of the opening release lever 24 during the right rotation operation.

Next, the operation will be explained.

First, make sure the battery voltage is sufficient.
The operation when both the opening release magnet 8 and the closing release magnet 9 can exert sufficient attraction force will be explained with reference to FIGS. 1 and 2.

In FIG. 1, a release operating member (not shown) is operated, and thereby the electromagnetic release circuit (not shown) and the power supply circuit of the exposure control circuit are first closed, and the open release magnet 8 and the close release magnet 9 are closed. Start operation, each iron piece 1
3 and 18 are held by suction.

The release operation member moves the release start lever 20 by its spring 2 by the next operation.
2 to the right to disengage the hook 20a from the corner 10d.

As shown in FIG. 1, the iron piece 13 is attached with a slight amount of play relative to the opening release magnet lever 10 so that it will come into closer contact with the opening release magnet 8 in the charging state of the shutter. This play is absorbed by the iron piece spring 14, and the iron piece spring 14 is compressed during charging, but as described above, when the hook 20a disengages from the corner 10d,
The opening release magnet lever 10 rotates to the left by an amount corresponding to this play, and this time, as the iron piece 13 is attracted to the opening release magnet 8, the left rotation is stopped again, resulting in the state shown in FIG. becomes.

In FIG. 2, as described above, when the opening release magnet lever 10 rotates to the left by the amount of play of the iron piece 13, the arm 10b rotates the arm 15b.
Similarly, the closed release magnet lever 15, which was being held down, rotated to the left by the play of the iron piece 18.
It is stopped by a closing release magnet 9.

Due to this slight counterclockwise rotation of the closing release magnet lever 15, the lock lever 5, whose arm 5a was restrained by the protrusion 15c, rotates to the right following the protrusion 15c, but it remains in an extremely slight clockwise rotation. , does not affect other parts at all.

In the operation from the state shown in FIG. 2, first, the opening release magnet 8 stops operating by the control operation of an electromagnetic release circuit (not shown), and thereby the iron piece 13 is released from its adsorption and holding. Then, the opening release magnet lever 10 rotates to the left, pushes the lock 24b with its arm 10a, rotates the opening release lever 24 to the right, and disengages the lock 24a from the opening drive member 28. As a result, the opening driving member 28 is actuated by the urging force of the opening driving spring 29 to open the shutter. In the above, the opening release magnet lever 10 rotates to the left to push the shutter 24b with the arm 10a to open the shutter, and then further rotates to the left, so that the opening release lever 24 also rotates to the right, and finally makes that right rotation stopper pin 3
Suppressed by 7. As a result, the opening release magnet lever 10 is also prevented from rotating to the left.
At this time, the protrusion 10e is held so that its surface d is within the locus of the movement of the surface a of the hook 5b when the lock lever 5 is actuated, which will be described later.

Next, by operating the exposure control circuit (not shown), the operation of the close release magnet 9 is stopped at an appropriate time, and when the iron piece 18 is released from its adsorption and holding, the close release magnet lever 15 is rotated to the left. Push the cover 30b with the arm 15a, rotate the closing release lever 30 to the right, and release the closing drive member 35.
The engagement by the shank 30a is released. This causes the closing drive spring 36 to actuate the closing drive member 35 to close the shutter and complete exposure. At this time, the close release magnet lever 15 rotates the close release lever 30 to the right to complete the closing release of the shutter, and then rotates the close release lever 30 to the right until it is restrained by the stopper pin 34, and then is stopped by this restraint. Ru. Further, as the closing release magnet lever 15 rotates to the left, the arm 5a follows the surface e of the protrusion 15c and rotates slightly to the right, but soon the surface a of the hook 5b turns to the lock lever, which has already stopped. It engages with the surface d of the protrusion 10e of No. 10, and its right rotation is inhibited.

After opening and closing the shutter as described above,
Charging is performed by a charge operating member (not shown) that controls the shutter opening drive member 28 and closing drive member 3.
5 to a position where it can engage with the locks 24a and 30a, respectively, and rotate the open release magnet lever 10 to the right against the spring 12 to engage its corner 10d with the hook 20a. It is done by letting By turning the opening release magnet lever 10 to the right, the opening release lever 24 is rotated to the left by the spring 26 until it is restrained by the stopper pin 27, and the opening release lever 24 is rotated to the left by the spring 26.
is opened and brought to a position where it is engaged with the drive member 28. Also, close release magnet lever 1
5 rotates its arm 15b to the right by being pushed by the arm 10b, compresses the iron piece spring 19, closes the iron piece 18, and is held in a state pressed against the release magnet 9. Further, when the opening release magnet lever 10 rotates to the right as described above, the surface a of the lock lever 5 deviates from the surface d and rotates to the right, but since the closing release magnet lever 15 rotates to the right as described above, the surface of the lock lever 5 rotates to the right as described above. The arm 5a is pushed at e and rotates to the left again, at which time the opening release magnet lever 10
There is no obstacle to the right rotation operation of the

With the above steps, the shutter charging is completed, and each member returns to the charged state shown in FIG. 1 again.

Next, a case where the battery voltage decreases will be explained.

To avoid repeating the description of the operation in the case of normal battery voltage described above, in FIG. When the net lever 10 stops rotating to the left, the springs 12 and 17 are stronger than the force with which the open release magnet 8 and the close release magnet 9 attract and hold the iron pieces 13 and 18. The magnet lever 15 simultaneously rotates to the left with its arms 10b and 15b engaged.

As mentioned above, when the opening release magnet lever 10 is released from the lock and turning to the left, the closing release magnet lever 15 also turns to the left.
At the same time, the lock lever 5, which engages the arm 5a with the surface e, is rotated to the right. That is, the lock lever 5 rotates to the right at the same time as the opening release magnet lever 10 rotates to the left, but in this case, the closing release magnet lever 15 closes its left rotation and is not held by the release magnet 9, so the lock lever 5 rotates to the left.
opens its hook 5b and reaches its trajectory before the protrusion 10e is actuated by counterclockwise rotation of the release magnet lever 10, and then engages with the surface c of the protrusion 10e that has caught up with the surface b. As a result, the opening release magnet lever 10 is stopped from rotating to the left, and the closing release magnet lever 15, which is engaged with the arm 10b by the arm 15b, is also prevented from rotating to the left.

The above state is shown in FIG. 3, and since the opening release magnet lever 10 and the closing release magnet lever 15 are both locked in operation in the middle of their operation, the opening release lever 24, Neither the closing release lever 30 is operated, and the opening drive member 28 and the closing drive member 35 are both maintained in a charged state.

When the photographer (cameraman) finds himself in the above situation, the shutter does not operate even though he has performed the release operation, and if the camera is a single-lens reflex camera, the shutter does not operate. Since it does not open or close, and therefore does not activate the mirror return mechanism in the camera's mirror box that is activated when the shutter is closed, the mirror remains in the flipped up position, and it is immediately noticed that the battery is low.

From the release lock state shown in Figure 3, the first
To return to the initial charge state shown in the figure, operate an operating member (not shown) to move the release pin 4 to position 4' to temporarily return to the pre-charge state, and then Try performing the charge operation again.

By the operation of the release pin 4 described above, the lock release lever 1 is released from its restraint and rotates to the left following the release pin 4 by the spring 3, and pushes the arm 5c with its protrusion 1a to rotate the lock lever 5 to the left. Seshime,
Disengage surface c from surface b. As a result, the opening release magnet lever 10 is released from its lock and rotates to the left together with the closing release magnet lever 15.

The opening driving member 28 and the closing driving member 35 are simultaneously unlocked and activated by the above-mentioned operation, but since both members operate at the same time and there is no back-and-forth operation, the shutter can be opened and closed. The charge is simply released without any activation.

Next, a second embodiment of the present invention shown in FIG. 4 will be described, avoiding duplication with the above-described first embodiment.

In FIG. 4, the closing release magnet lever 115 has a pin 115c, to which the arm 105a of the lock lever 105 is engaged. Further, the opening release magnet lever 110 has a protrusion 110e provided on the arm 110b, which is attached to the hook 105b of the lock lever 105.
related to.

In the above configuration, the normal shutter opening/closing operation is the same as that of the first embodiment already explained, so the explanation will be omitted, and only the operation when the voltage of the battery (not shown) drops. To explain, FIG. 4 shows the charging state of the shutter, and in this state, the release start lever 20 is turned to the right, the open release magnet lever 110 is turned to the left, the restraint of the arm 115b by the arm 110b is released, and the closed release magnet is released. When the net lever 115 is also rotated to the left, the pin 115
The arm 105a follows c, and the lock lever 10
5 rotates to the right.

Due to its clockwise rotation, the lock lever 105 blocks the trajectory of the protrusion 110e with the hook 105b faster than the projection 110e passes, and locks the opening release magnet lever 110 from turning to the left, thus locking the opening release magnet lever 110. 115 is also locked in its left rotation, and the opening drive member 28 and the closing drive member 35 are both kept locked and their release operations are locked.

This locked state is released by turning the lock release lever 1 to the left, pushing the arm 105c with the protrusion 1a, and turning the lock lever 105 to the left. That is, this causes the hook 105
b from the protrusion 110e, turn both the opening release magnet lever 110 and the closing release magnet lever 115 to the left, and open the opening drive member 28.
and a closing drive member 35 are simultaneously started to release the charge state without opening or closing the shutter.

In the first and second embodiments described above, by replacing the battery and operating the double exposure mechanism of the camera to perform the winding operation, it is possible to charge only the shutter without needlessly winding unexposed film. .

To release the locked state, use the lock lever 5.
This may also be done by directly rotating 105 to the left.

According to the present invention, in the electric shutter equipped with the electromagnetic release circuit as described above, when the voltage of the battery decreases, the opening release magnet levers 10, 110 are held in a state slightly moved from the charging state. This inhibits the closing release magnet lever 15, 115, and locks the operation of the opening release magnet lever 10, 110 by the lock lever 5, 105 interlocked with the closing release magnet lever 15, 115. Close the release magnet lever 1
Since it also inhibits the operation of 5,115,
The signal caused by the voltage drop in the battery of the electric shutter, which consists of two electromagnets, is reliably transmitted to the photographer (cameraman), and only one component, the lock lever 5,105, is required for this purpose, so the minimum number of parts is required. Since only an increased number of parts is required and the structure is very simple, it can be implemented at low cost and has very effective practical effects in terms of function and economy.

[Brief explanation of drawings]

FIG. 1 is a front view showing the charging state of the first embodiment of the present invention, FIG. 2 is a front view showing the state immediately after the release operation is performed when the battery is sufficiently charged in FIG. 1, and FIG. The figure is a front view showing a case where the release operation is performed when the battery capacity is insufficient in FIG. 1, and FIG. 4 is a front view showing a second embodiment of the present invention. 1...Lock release lever, 4...Release pin, 5
... Lock lever, 8 ... Open release magnet, 9 ... Closed release magnet, 10 ... Open release magnet lever, 13, 18 ... Iron piece, 15 ... Closed release magnet lever, 2
0... Release start lever, 24... Opening release lever, 28... Opening drive member, 29...
Opening drive spring, 30...Close release lever, 3
5... Closing drive member, 36... Closing drive spring.

Claims (1)

[Claims for Utility Model Registration] An open release magnet 8 whose operation is controlled by an electromagnetic release circuit, a closed release magnet 9 whose operation is controlled by an exposure control circuit, and the above-mentioned open release magnet. When it is biased in the direction away from 8 and is in the shutter charge state,
The open release magnet levers 10 and 110 are locked by the release start lever 20 in a position where they are pressed against this bias, and the shutter release magnet levers 10 and 110 are biased in a direction away from the aforementioned close release magnet 9 and are in the shutter charging state. When,
A closing release magnet lever 15, 115 is held in a position pressed against the closing release magnet 9 by the aforementioned opening release magnet lever 10, 110 against this bias, and the aforementioned closing release magnet. Netlever 15,
115 closes and moves away from the release magnet 9.
and the above-mentioned opening release magnetic lever 10,
When the magnet operating voltage is not sufficient for the operation of the magnet 110 to open and move away from the release magnet 8, the holding is removed and at the same time the close release magnet levers 15, 115 close and move away from the release magnet 9, The lock levers 5, 105, which operate in accordance with this operation, open and lock the release magnet levers 10, 110 in the middle of their operation, and then close the release magnet levers 15, 115 in the middle of their operation. It gets stuck. An electric shutter release lock device equipped with an electromagnetic release circuit.