JPH0414736Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to an improvement in an electromagnetic shutter mechanism that is controlled by an electromagnetic device and that opens and closes the shutter blades using a single drive spring.

Prior Art This type of conventional electromagnetic shutter mechanism has the advantage of reducing the number of parts and downsizing the mechanism, as described in, for example, Japanese Utility Model Application Publication No. 59-33028, but on the other hand,
Since one drive spring must be charged with the force necessary to both open and close the shutter blade, the force of the electromagnetic device must be increased, resulting in an increase in size and cost of the electromagnetic device. There was a problem.

Purpose In view of the above problems, the present invention aims to provide an electromagnetic shutter mechanism that achieves miniaturization and cost reduction of electromagnetic devices.

Overview The electromagnetic shutter mechanism according to the present invention charges the drive spring by multiple suction operations of the electromagnetic device, releases the shutter with the last suction, and closes the shutter with the final release. This allows the electromagnetic device to have less power.

Embodiment Hereinafter, the present invention will be explained in detail based on an illustrated embodiment. FIG. 1 shows a set state of the shutter of the present invention, and 1 is a substrate having an exposure opening 1a and a guide hole 1b, 2 and 3. 4 is a pair of shutter blades pivotally mounted on the back surface of the substrate 1 and having small elongated holes 2a and 3a; 4 is pivotally mounted on the substrate 1 and has pins 4a and 4b implanted on the surface; Pins 4 that fit into the small elongated holes 2a and 3a, respectively
This is an opening/closing lever which has numerals c and 4d implanted therein, and further has an engaging portion 4e at the tip and an escape hole 4f at the center. However, the pin 4b is provided at a position farther from the pivot point of the opening/closing lever 4 than the pin 4a. 5
an opening lever 6 which is pivotally mounted on the substrate 1 and whose tip 5a abuts the pin 4a from below in the drawing;
is pivotally mounted coaxially with the closing lever 5 on the base plate 1, and has one arm 6a abutting the pin 4b from above in the drawing, and an engaging edge 6 continuous to the other arm 6b in two steps.
c and a closing lever having an engaging claw 6d and a stepped portion 6e, and further having a protruding portion 6f in the center; and 7, which is stretched between the opening lever 5 and the closing lever 6; There is a drive spring that closes the dextrorotation behavior and gives the lever a left rotation behavior. 8 is pivotally mounted on the base plate 1 and is given right-handed rotation by a spring 9, and has a claw portion 8b that engages with the engaging portion 4e and a pin 8c implanted at the tip of the one arm portion 8a. 10 is an opening locking lever 8 on the base plate 1, and the other arm 8d faces within the rotation locus of the protrusion 6f and has a pin 8e implanted in the other arm 8d. It is pivoted coaxially with the lever 6 and is given right-handed rotation by a spring 11, and the tip of one arm 10a abuts the tip edge of the other arm 6b of the closing lever 6, so that when the closing lever 6 rotates to the right, a stepped portion is formed. This is an intermediate latch lever having a lower bent portion 10b that engages with the pin 6e, and the other arm portion 10c can come into contact with the pin 8e from below in the drawing. 12 is fixed to a pin 13 that slides into the guide hole 1b, and has a downwardly bent portion 12b at the tip of one arm portion 12a that sequentially engages with an engaging edge 6c and an engaging claw 6d; 12c is a two-pronged suction lever that contacts the pin 8c from the right side in the drawing; 14 is a suction lever that is wound around the pin 13;
2 and a pin 15 implanted on the substrate 1, and a spring 16 is attached to the substrate 1 and the actuator 16a is attached to the pin 15. 13, and is an electromagnetic plunger that is controlled by a control circuit (not shown) and repeats the downward suction operation of the suction lever 12 twice when the shutter is released.

Since the electromagnetic shutter mechanism according to the present invention is constructed as described above, the electromagnetic plunger 16 is first excited by the shutter release signal from the control circuit, and the suction lever 12 is moved against the spring 14 as shown in FIG. When it is sucked downward as shown by the solid line, the lower bent portion 12b of the suction lever 12 engages with the engagement edge 6c, so that the closing lever 6 is rotated to the right by a predetermined amount, and the drive spring 7 is charged. Ru. At the same time, the stepped portion 6e of the closing lever 6 moves downward from the lower bent portion 10b, so the intermediate latch lever 10 rotates to the right due to the elasticity of the spring 11, and the lower bent portion 10b engages with the stepped portion 6e, thereby closing. Latch the lever 6 in that position. At this time, the arm portion 6a of the closing lever 6 is separated from the pin 4b. When the electromagnetic plunger 16 is demagnetized, the suction lever 12 is separated upwardly as shown by the chain line in FIG. After performing the swinging movement, it engages with the engagement claw 6d.

Subsequently, when the electromagnetic plunger 16 is excited a second time and the suction lever 12 is sucked downward again as shown by the solid line in FIG.
is further rotated to the right, and the drive spring 7 is further charged. On the other hand, due to this clockwise rotation of the closing lever 6, the protruding portion 6f pushes the arm portion 8d and causes the opening locking lever 8 to rotate counterclockwise against the spring 9, so that the claw portion 8b
is removed from the engaging portion 4e of the opening/closing lever 4. Therefore, the opening/closing lever 4 is rotated to the left by the elasticity of the drive spring 7 via the opening lever 6 and the pin 4a.
The shutter blades 2 and 3 are opened. Also, by turning the opening locking lever 8 to the left, the pin 8e is moved to the arm portion 10.
c is pushed to rotate the intermediate latch lever 10 to the left against the spring 11, so that the lower bent portion 10b is disengaged from the stepped portion 6e and the latch to the closing lever 6 is released. When the opening/closing lever 4 is rotated to the left, its arcuate tip edge prevents the tip or intermediate protrusion of the arm 8a of the opening/closing lever 8, thereby maintaining the latched state. Incidentally, the left side edge from the tip of the arm 8a of the opening/closing lever 8 to the protrusion may be formed in the same arc shape as the tip edge of the opening/closing lever 4.

Next, when a shutter closing signal is output from the control circuit at a predetermined timing and the electromagnetic plunger 16 is demagnetized again, the suction lever 12 is separated upwardly as shown by the chain line in FIG. 3 due to the elasticity of the spring 14, and the arm 12c is rotated to the right by being guided by the pin 8c, so that the downward bent portion 12
b is removed from the claw portion 6d, and the restraint on the closing lever 6 is released. Therefore, the opening/closing lever 4 is rotated to the right by the elastic force of the drive spring 7 via the closing lever 6 and the pin 4b, and the shutter blades 2 and 3 are closed. The shutter blades 2 and 3 can be closed by a single drive spring 7 because the distance from the pivot point of the opening/closing lever 4 to the pin 4b is longer than the distance from the pin 4a, so the rotational moment in the closing direction is This is because the rotational moment in the opening direction is larger. Furthermore, it goes without saying that with the above configuration, it is possible to close the shutter blades 2 and 3 in the middle of opening.

Finally, each member returns to the set state shown in FIG. 1 and the blade opening/closing process is completed, but in the present electromagnetic shutter mechanism, the driving spring 7 is charged by two (multiple) suction operations of the electromagnetic plunger 16. At the same time, the final suction causes the shutter to release, and the final release causes the shutter to close, so the force of the electromagnetic plunger 16 can be small. Therefore, it is possible to reduce the size and cost of the electromagnetic plunger 16.

The electromagnetic shutter mechanism of the present invention has a plurality of engagement claws 6d of the closing lever 6, and the electromagnetic plunger 16
It is also possible to set the suction operation to three or more times. Further, when the present electromagnetic shutter mechanism is applied to a camera equipped with a lens drive mechanism, the lens drive is released and/or latched by suction and separation operations other than the final attraction and separation operations of the electromagnetic plunger 16. It may be configured.

Effects of the Invention As described above, the electromagnetic shutter mechanism according to the present invention has the practically important advantage of being able to realize miniaturization and cost reduction of the electromagnetic device.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the set state of an embodiment of the electromagnetic shutter mechanism according to the present invention, Fig. 2 is a plan view showing the first stage charge state of the drive spring 7, and Fig. 3 shows the blade open state. FIG. 1... Board, 2, 3... Shutter blade, 4...
Opening/closing lever, 5... Opening lever, 6... Closing lever, 7... Drive spring, 8... Opening locking lever, 9
... Spring, 10 ... Intermediate latch lever, 11 ...
Spring, 12... Suction lever, 13... Pin, 14
... Spring, 15 ... Pin, 16 ... Electromagnetic plunger.

Claims (1)

[Claims for Utility Model Registration] A shutter blade opening/closing lever which is provided with an opening pin and a closing pin sequentially from the axis side at different distances from the axis, and which opens and closes the shutter blade by rotating around the axis; An opening lever capable of pushing the opening pin, a closing lever provided with a plurality of stages of engagement parts and capable of pushing the closing pin, and a drive spring stretched between the opening lever and the closing lever. , a latch lever that latches the closing lever in stages when the drive spring is in a charged state; and a latch lever that locks the opening/closing lever in the blade closed position and unlatches the latch lever in conjunction with the release of the locking operation. A locking lever and an electromagnetic device for attracting and separating a suction lever that engages with the engaging portion of the closing lever are provided, and the first suction operation of the electromagnetic device charges the drive spring, and the last The suction action releases the locking of the opening/closing lever by the locking lever and unlatches the latch lever, and the opening/closing lever is actuated in the blade opening direction by the opening lever, and the final separation action causes the opening/closing lever to be operated by the closing lever. An electromagnetic shutter mechanism that operates the blades in the direction of closing the blades.