JP2571715Y2 - Electromagnet device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnet device used as an actuator for driving a shutter of a camera or the like, and more particularly, to an electromagnet or a permanent magnet for an iron core to attract and hold an iron piece by the action of an electromagnet or permanent magnet. The present invention relates to an electromagnet device that utilizes an iron piece lever to attract and hold an iron piece lever.

[0002]

2. Description of the Related Art For example, in a camera or the like, an electromagnet device in which an iron core attracts and holds an iron piece by the action of an electromagnet or a permanent magnet is widely used as an actuator for driving a shutter. The basic configuration of this type of electromagnet device is represented by that shown in FIG.
There are those represented by. The type shown in FIG. 9 is called an energization holding type or the like. When a current is applied to the coil 102, a magnetic force is generated in the iron core 101 and the iron piece member 103 is attracted. When the energization is turned off, the magnetic force disappears and the urging force of the spring 107 causes The iron piece member 103 is separated and rotates around the shaft 106. The type shown in FIG. 10 is called a self-holding type or a demagnetizing release type. When a magnetic force is generated in the iron core 201 by the action of the permanent magnet 210 and the coil 202 is not energized, the iron piece member 203 is When the coil 201 is energized and the coil 202 is energized, the magnetic force of the iron core 201 is canceled out, and the iron piece member 203 is separated by the urging force of the spring 207 and rotates around the shaft 206.

[0003] A specific example of the related art will be described in the case of an electromagnet apparatus of a current holding type. In FIG. 8, reference numeral 21 denotes a substantially U-shaped iron core to which a coil 22 is attached. Reference numeral 23 denotes an iron piece having a flat adsorption surface formed thereon.
It is adsorbed by two end faces P ₃ and P ₄ . Reference numeral 24 denotes an iron piece shaft, which is fixed to the iron piece 23 by caulking or the like, and a collar 24a is fixedly attached to the end opposite to the iron piece 23.
Reference numeral 25 denotes an iron piece lever, which is rotatably mounted on a shaft 26 as an axis, and is given a rotational force in a direction away from the iron core 21 by an urging member 27 such as a spring. A guide hole 25a having an inner diameter larger than the outer diameter of the iron piece shaft 24 is formed in the iron piece lever 25 so as to have a predetermined play with the iron piece shaft 24. Reference numeral 28 denotes a coil spring, which is arranged around the iron piece shaft 24 between the iron piece 23 and the iron piece lever 25 so as to absorb overrun of the iron piece lever 25.

FIG. 8 shows, for example, a state in which the shutter is overcharged and the like. When the coil 22 is energized and the iron piece 23 is adsorbed on the iron core 21,
A pressing member 29 such as a pin operated by driving from a camera body (not shown) presses the iron piece lever 25 against the urging member 27, and presses the iron piece 23 toward the iron core 21 to attract the iron piece 23. Holding. From such a state,
When the energization of the coil 22 is turned off after the pressing by the pressing member 29 is released, the iron piece lever 25
The iron piece 23 is separated from the iron core 21 by pressing in contact with the flange 24a of the iron piece shaft 24 at the outer peripheral surface 25b at the end of the iron piece shaft 24.

[0005]

However, in the prior art, as shown in FIG. 8, the contact between the collar 24a of the iron piece shaft 24 and the iron piece lever 25 is surface contact or contact at two points. If the surface accuracy or the dimensional accuracy of each contact portion is not achieved to a predetermined level, the action of the iron piece lever 25 is
This causes the balance to be lost with respect to the suction (separation) surface of the substrate, resulting in poor hold and deviation in the timing of separation. However, achieving predetermined surface accuracy and dimensional accuracy is not easy in manufacturing, and is inconvenient. Also,
In the conventional configuration, the action on the iron piece 23 is biased due to the rotational moment generated by the rotation of the iron piece lever, and the iron piece 23 is swung,
A uniform action could not be achieved on the adsorption (separation) surface, which was inconvenient.

On the other hand, for example, Japanese Utility Model Publication No. 61-576
No. 7 proposes a technique in which a brim portion of an iron piece mounting shaft and an iron piece lever come into contact with each other on a small surface. However, according to the technology described in the gazette, since the contact is small but the surface is in contact, the bias of the contact due to the processing accuracy of the surface and the like cannot be completely eliminated. Further, Japanese Utility Model Publication No. 3-9291 proposes a technique in which the point of action of the rotary lever with respect to the mover is formed as a projection, and this point of action is shifted from the center line of the mover. This is effective in that the rotational moment that weakens the holding force can be reduced, but on the other hand, it has the advantage of arranging the action point on the center line of the iron piece, which is advantageous in suppressing variation in the timing of separation. It could not be used.

[0007] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to make the adsorption and holding of the iron piece and the iron core uniform and stable, and to set the timing at the time of separation. An object of the present invention is to provide an electromagnet apparatus which is less accurate and has less variation.

[0008]

To achieve the above object, an electromagnet apparatus according to the present invention comprises an iron core having a coil, an iron piece having a flat attracting surface to be attracted to the iron core, and An attached connecting member, and an iron piece lever which is loosely fitted to the connecting member, is provided with a rotational force around one end by an urging member, and acts to separate the iron piece from the iron core via the connecting member. In the electromagnet device, the connecting member is attached to the iron piece at a position that does not overlap with the center line of the iron core, and the iron piece lever is formed such that a protrusion that contacts the connecting member substantially on the center line of the iron core is formed. It was done.

[0009]

The protrusion formed on the iron piece lever abuts on the connecting member attached to the iron piece at a position not overlapping with the center line of the iron core, substantially on the center line of the iron core, and presses the connecting member. Thus, the influence of the rotational moment by the iron piece lever is prevented from affecting the suction surface of the iron piece. As a result, the action of the iron pieces on the adsorption surface becomes uniform, and the variation in the adsorption and holding is reduced.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a sectional view showing a first embodiment of the electromagnet device of the present invention. In FIG. 1, reference numeral 1 denotes a substantially U-shaped iron core on which a coil 2 is wound and attached. Coil 2
Is connected to a drive circuit (not shown) and an arithmetic circuit (CPU) so that selective energization can be performed. Reference numeral 3 denotes an iron piece, on which a flat suction surface is formed, on which the iron piece 3 is sucked by the _two end faces P ₁ and P ₂ of the iron core 1. Reference numeral 4 denotes an iron piece axis, which is located at a position not overlapping with the center line A of the iron core 1, and in the embodiment of FIG.
_At a position close to the _second side, it is fixed and attached to the iron piece 3 by appropriate means such as caulking. A flange 4a is attached to an end of the iron piece shaft 4 opposite to the iron piece 3.

Reference numeral 5 denotes an iron piece lever, which is rotatably mounted on a shaft 6 as an axis, and to which a biasing member 7 applies a rotating force in a clockwise direction. 5a is a guide hole formed in the iron piece lever 5, having an inner diameter larger than the outer diameter of the iron piece shaft 4, and having a predetermined play with the iron piece shaft 4. . Reference numeral 5b denotes a projection formed on the iron piece lever 5, which comes into contact with the collar 4a of the iron piece shaft 4 on a substantially center line of the iron core 1 as described later. Reference numeral 8 denotes a coil spring, which is disposed around the iron piece shaft 4 between the iron piece 3 and the iron piece lever 5, and is capable of absorbing an overrun of the iron piece lever 5 so that overcharging or the like can be performed.

FIG. 1 shows a state of the shutter, such as overcharging, in which the coil 2 is energized and the iron piece 3 is held by the iron core 1 by suction. A pressing member 9 such as a pin operated by a drive from a camera body (not shown) presses the iron piece lever 5 counterclockwise against the urging member 7.
The iron piece 3 is pressed toward the iron core 1 via the coil spring 8 to maintain the suction state.

FIG. 2 shows a first embodiment of the electromagnet apparatus of the present invention.
It is sectional drawing which shows Example of (a). When the energization of the coil 2 is turned off after the pressing of the pressing member 9 is released from the state of FIG. 1, the urging member 7 rotates the iron lever 5 in the clockwise direction, and the protrusion formed on the iron lever 5. 5b is an iron core 1
, Ie, on a line where L ₁ and L ₂ are substantially equal to each other, comes into contact with the collar 4 a of the iron piece shaft 4. FIG. 2 shows this state.

When the iron piece lever 5 is further rotated clockwise, the collar 4a is pressed at one point of the projection 5b, so that the rotation of the iron piece lever 5 causes the rotation of the iron piece shaft 4 in the clockwise direction. small acts to swing, while in the mass of the iron piece shaft 4 is an end face P ₁ side of the iron piece 3 as a fulcrum iron shaft 4 is attached at a position closer to iron piece 3 to the end surface P ₂ side Since a large left-handed rotation moment is generated, the left-handed rotation moment cancels the action of trying to turn rightward in the clockwise direction, thereby preventing the head from turning. Therefore, small swing of the iron piece 3 due to the rotation of the iron piece lever 5 is prevented, and the iron piece 3
Are separated from the two end faces P ₁ and P ₂ at the same time, and the variation in the separation timing is reduced.

FIG. 3 is a plan view of the iron piece 3 of the first embodiment. The end faces P ₁ and P ₂ of the iron core 1 to which the iron piece 3 is adsorbed are shown. Reference numeral 3a denotes a hole or the like in which the iron piece shaft 4 is fixed. In the first embodiment, the iron piece 3
As shown in the figure, the plane shape is a substantially rectangular shape, but by changing the distribution state of the mass by changing the shape of the iron piece 3 to an appropriate shape according to the degree of the swing of the iron piece shaft 4 described above, The bias of the action on the iron piece 3 due to the rotation moment generated by the rotation of the iron piece lever 5 is corrected by the mass of the iron piece 3 to completely prevent the influence of the rotation moment due to the rotation of the iron piece lever 5. Can be.

FIG. 4 shows a specific example. FIG. 4 is a plan view showing the second embodiment of the electromagnet device of the present invention, and showing the iron piece 33 in which the state of mass distribution is changed. The iron piece 33 is substantially the same thickness as the iron piece 3 in FIG.
Is formed. Therefore, a range where the mass is large is formed by the enlarged portion 33b, so that the bias of the action due to the rotational moment of the iron piece lever 5 is balanced. Reference numeral 33a denotes a hole or the like in which the iron piece shaft 4 is fixed.

FIG. 5 shows a third embodiment of the electromagnet device according to the present invention. The bias of the action due to the rotation moment due to the rotation of the iron piece lever 5 is corrected by correcting a part of the iron piece 3 to be brought into contact with the iron piece lever 5. That is, as shown in FIG. 5, the iron piece 43 is formed with an extension 43a that can be brought into contact with the iron piece lever 5, and this extension 43a
The iron lever 5 is abutted and pressed to balance the bias of the action caused by the rotational moment.

[0018] In the third embodiment from the first embodiment, although a case where iron shaft 4 is attached to the end surface P ₂ side of the iron core 1 with respect to the center line of the iron core 1, FIG. As in the fourth embodiment of the electromagnet device of the present invention shown in FIG. 6 and the fifth embodiment of the electromagnet device of the present invention shown in FIG. may also be attached to the end face P ₁ side, the effect is the third from the first embodiment
This is the same as that of the embodiment.

In the above-described embodiment of the present invention, the description has been made of the electromagnet apparatus of the current holding type. However, the same applies to a self-holding type (demagnetized release type) electromagnet apparatus having a holding permanent magnet. Of course, the effect can be obtained. It is also very effective for other driving purposes in an electromagnet apparatus in which a rotating member such as the iron lever 5 and the iron piece 3 are connected.

[0020]

As described above, according to the present invention, the connecting member is attached to the iron piece at a position that does not overlap the center line of the iron core, and the iron piece lever is connected substantially on the center line of the iron core. Because the projections that come into contact with the members are formed, the suction holding between the iron piece and the iron core is made uniform and stable,
In the separation, the variation in the timing is reduced to make the timing accurate, and the imbalance with respect to the suction (separation) surface due to the bias of the action due to the rotational moment due to the rotation of the iron piece lever is eliminated. An electromagnet device can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the electromagnet device of the present invention.

FIG. 2 is a sectional view showing a first embodiment of the electromagnet device of the present invention.

FIG. 3 is a plan view showing an iron piece in the first embodiment of the electromagnet device of the present invention.

FIG. 4 is a plan view of an iron piece showing a second embodiment of the electromagnet device of the present invention.

FIG. 5 is a sectional view showing a third embodiment of the electromagnet device of the present invention.

FIG. 6 is a sectional view showing a fourth embodiment of the electromagnet device of the present invention.

FIG. 7 is a sectional view showing a fifth embodiment of the electromagnet device of the present invention.

FIG. 8 is a sectional view showing a conventional example.

FIG. 9 is a sectional view showing a basic configuration of an electromagnet device.

FIG. 10 is a sectional view showing a basic configuration of an electromagnet device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 iron core 2 coil 3 iron piece 4 iron piece shaft 5 iron piece lever 6 axis 7 biasing member 8 coil spring 9 pressing member

Claims (3)

(57) [Scope of request for utility model registration] 1. An iron core having a coil, an iron piece having a flat suction surface to be sucked to the iron core, a connecting member attached to the iron piece, and one end side of the connecting member loosely fitted by the urging member. An iron piece lever which is provided with a rotational force about the axis and acts to separate the iron piece from the iron core via the connecting member, wherein the connecting member does not overlap the center line of the iron core. An electromagnet device characterized in that the iron piece lever is formed with a projection that abuts on the connecting member substantially on the center line of the iron core. 2. The bias of the action due to the rotation of the iron piece lever,
The electromagnet device according to claim 1, wherein the iron piece is formed so as to be corrected by the mass of the iron piece. 3. The bias of the action due to the rotation of the iron piece lever,
The electromagnet device according to claim 1, wherein the iron piece is formed so that the iron piece is corrected by abuttingly pressing the iron piece lever.