JP2006324281A - Solenoid drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the configuration of a solenoid drive device capable of switching operation by utilizing electromagnetic force, and to reduce power consumption. <P>SOLUTION: There are a pair of stationary magnets 110, 120 arranged oppositely, and a moving magnet 130 arranged between the stationary magnets. One of the stationary magnets and the moving magnet is composed of an electromagnet, and the other is composed of a permanent magnet. The moving magnet is attracted to one of the pair of stationary magnets 110, 120 by attraction magnetic force generated when current conducts to an electromagnet 130 for magnetization. The direction of current conducting to the electromagnet is changed, or current conducts to an electromagnet at an arbitrary side for attracting the moving magnet to the stationary magnet at the arbitrary side, thus switching and moving an armature 140 mounting the moving magnet 130, and hence retaining a switched state even if the conduction of the current is stopped for reducing the power consumption. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a driving device that generates a driving force by using a magnetic force, and more particularly to an electromagnetic driving device that generates a driving force by controlling energization of an electromagnetic solenoid.

  Motors and solenoids are used to drive various mechanisms built in cameras and the like. For example, in the diaphragm mechanism having a two-blade configuration for adjusting the lens light quantity of the camera shown in FIG. 1 to be described later in detail, triangular cutouts 11a and 12a are formed in the first blade plate 11 and the second blade plate 12, respectively. The blades 11 and 12 are moved in the directions opposite to each other in the P and Q directions to adjust the amount of overlap between them, that is, the amount of overlap between the notches 11a and 12a of both blade plates. The diaphragm aperture formed by 11a and 12a is adjusted. In order to adjust the aperture opening, ratchet teeth 15 are provided on a part of the second vane plate 12, and the first vane plate 11 and the second vane are provided by a lock mechanism 10 </ b> A having a latching claw 142 meshing with the ratchet teeth 15. The structure which latches the blade 12 is taken. As shown in FIG. 7, the lock mechanism 10 </ b> A includes an electromagnet 301 as a driving device, a swing arm 302 whose intermediate portion is swingably supported by a support shaft 304, and one end portion of the swing arm 302. An armature 303 provided and attracted to the electromagnet 301, a spring 305 for biasing the swing arm 302, and a pin 306 provided at the other end of the swing arm 302 are in sliding contact with the swing arm 302. The cam 307 is forcibly swung clockwise. The electromagnet 301 includes a magnetic core 311 and a solenoid 312 wound around the core 311, and generates electromagnetic force in the core 311 when the solenoid 312 is energized. The swing arm 302 is provided with a locking claw 308 at a part of one end thereof, and meshes with the ratchet teeth 15 of the second blade 12 to lock the movement of the second blade 12. The spring 305 generates a spring force that urges the armature 303 of the swing arm 302 in a direction away from the electromagnet 301.

  In this locking mechanism 10A, when the solenoid 312 of the electromagnet 301 is not energized, the arm 303 of the swing arm 302 is urged away from the electromagnet 301 by the force of the spring 305, and the locking claw 308 (142) meshes with the ratchet teeth 15. Then, the aperture value is fixed by locking the movement of the first and second blades 11 and 12. When releasing the lock by the locking claw 308, the cam 307 is rotated to swing the swing arm 302 in the clockwise direction, and at the same time, the solenoid 312 is energized, and the armature 302 is moved by the electromagnetic force generated by the core 311. It is adsorbed against the force and maintains the state in which the locking claw 308 is released from meshing with the ratchet teeth 15. Accordingly, the first and second blades 11 and 12 can be moved to adjust the aperture opening.

Thus, the electromagnetic drive device for performing various operations by switching the amateur between the first position and the second position using the electromagnet is widely used in other fields. The flow path switching device for switching the flow path of the discharge air from the main body is configured by an electromagnetic drive device. This flow path switching device includes a switching valve forced movement device for forcibly moving a switching valve for switching between a first flow path and a second flow path to a first position and a second position. An electromagnet and a permanent magnet are used, and the moving position of the switching valve is switched by using a magnetic force such as an attractive force or a repulsive force generated between them. That is, the switching valve is composed of a permanent magnet, and an electromagnet is arranged facing the first flow path opened and closed by the switching valve. It moves to a first position that closes the first flow path. Further, when the electromagnet is energized, the switching valve is moved to the second position where the first flow path is opened and the second flow path is closed by the repulsive force of the electromagnet and the permanent magnet.
JP 2001-207970 A

  In the lock mechanism 10A shown in FIG. 7, when the first and second blades 11 and 12 are movable, that is, when the ratchet teeth 15 are movable, the cam 307 is driven to move the swing arm 302. At the same time as swinging, it is necessary to energize the electromagnet 301 to keep the armature 302 adsorbed. Therefore, in addition to the swing arm 302 and the electromagnet 301 that are directly required to unlock the ratchet teeth 15, a cam 307 for returning the swing arm 302 and a mechanism for driving the cam 307 are required. The structure becomes complicated. Further, while the lock is released, it is necessary to continue energization of the electromagnet 301 in a state where a strong attraction force is exerted by the spring 305 force, and there is a problem that power consumption increases. On the other hand, in order to lock the ratchet teeth 15, a spring 305 for exerting a required urging force is required to urge the swing arm 302, and the number of parts constituting the lock mechanism 10 </ b> A increases. There is.

  On the other hand, in the technique of Patent Document 1, the switching valve is held in a state in which the first flow path is closed using the magnetic force of the permanent magnet, but the switching valve is urged in one direction or returned to the initial position. A mechanism for making it necessary is required, and in Patent Document 1, a configuration using a self-weight or a spring is required. Further, when the first flow path is opened by the switching valve, it is necessary to energize the electromagnet to attract the permanent magnet, that is, the switching valve, and to solve the problem of increasing power consumption during that time. Can not.

  An object of the present invention is to eliminate the need for components such as a spring as a biasing means and a cam as a return means in a drive device that can be switched using electromagnetic force, and to reduce power consumption. A possible electromagnetic drive is provided.

  The electromagnetic drive device of the present invention includes a pair of fixed magnets arranged opposite to each other and a movable magnet arranged between the fixed magnets, and either the fixed magnet or the movable magnet is constituted by an electromagnet, and the other Is constituted by a permanent magnet, and the movable magnet is attracted to one of a pair of fixed magnets by an attractive magnetic force generated when current is passed through the electromagnet and magnetized.

  According to the present invention, when the movable magnet is composed of an electromagnet, the movable magnet is attracted to any side of a pair of fixed magnets composed of permanent magnets by changing the direction of the current flowing through the electromagnet. be able to. In addition, when the movable magnet is composed of permanent magnets, the movable magnet is attracted to either one of the fixed magnets composed of electromagnets by passing current through any side of the pair of fixed magnets composed of electromagnets. Can be made. As a result, the movable magnet can be switched and moved simply by passing an electric current instantaneously through the electromagnet. In any case, even if the electric current is stopped after the movable magnet is attracted to the fixed magnet, Since the state can be maintained, current consumption can be significantly reduced. Moreover, even when the movable magnet is mounted on an amateur that performs a predetermined action, means such as a spring for biasing or holding the armature in one direction and means such as a cam for returning the armature to the initial position are unnecessary. Thus, the configuration can be simplified.

  Here, as a first aspect of the present invention, the pair of fixed magnets is composed of permanent magnets arranged opposite to each other with the magnetic poles facing opposite to each other, and the movable magnet is worn when a current is passed. The electromagnet is magnetized, and the electromagnet is attracted to one of a pair of permanent magnets depending on the direction of the current flowing through the electromagnet. For example, in a pair of permanent magnets, magnetic poles having different S poles and N poles are opposed to each other, and both ends that become S poles or N poles when the electromagnet is magnetized are between the magnetic poles of the pair of permanent magnets. It is arranged. The movable magnet can be switched and moved to a position on an arbitrary side only by changing the direction of the current flowing through the electromagnet.

  As a second form of the present invention, each of the pair of fixed magnets is composed of a pair of electromagnets that are magnetized when an electric current is passed, and each of the movable magnets is composed of a permanent magnet. One of the electromagnets is magnetized to attract the permanent magnet. For example, the pair of electromagnets can change the magnetic pole facing the magnetic pole of the permanent magnet to the S pole or the N pole by controlling the direction of the flowing current. It is possible to switch and move the movable magnet to an arbitrary position by passing an electric current through an arbitrary side of the pair of electromagnets.

  In the present invention, by integrally mounting the movable magnet on the amateur for performing a predetermined action, it is possible to switch the action performed by the amateur as the position of the movable magnet is switched. For example, by configuring the amateur as a part of a lock mechanism for locking the aperture mechanism of the camera, a lock operation with a simple configuration and low power consumption can be realized when setting the aperture opening.

  Next, embodiments of the present invention will be described with reference to the drawings. 2 and 3 show an embodiment in which the electromagnetic driving device of the present invention is applied to the lock mechanism 10 of the diaphragm mechanism of the camera shown in FIG. That is, as described with reference to FIG. 1, triangular notches 11 a and 12 a are provided in the first blade plate 11 and the second blade plate 12, respectively, as an aperture mechanism having a two-blade configuration for adjusting the lens light amount. The diaphragm apertures formed by the notches 11a and 12a are adjusted by moving the blades 11 and 12 in opposite directions and adjusting their positions. The first blade 11 is hooked to the camera fixing portion 14 by a spring 13 and is urged in the Q direction. The second vane plate 12 has a serrated ratchet tooth 15 formed in the length direction on the lower side, and a latching pawl 142 (to be described later) of the lock mechanism 10 can be engaged with the ratchet tooth 15. . A charge lever 16 that is rotated is connected to the first blade plate 11 and the second blade plate 12, and the rotation axis of the charge lever 16 is connected to a charge mechanism that does not appear in the drawing. The lock mechanism 10 is constituted by the electromagnetic drive device of the present invention.

  FIG. 2 is a plan view of the locking mechanism, and FIG. 3 is a cross-sectional view taken along line AA. In FIG. 2, a part is shown in a cutaway view. A pair of permanent magnets 110 and 120 as fixed magnets, an electromagnet 130 as one movable magnet, and the electromagnet 130 in a recess 103 provided on the surface of the base member 101 having a fixing hole 102 for a camera body or the like. A mounted amateur 140 is provided. The pair of permanent magnets 110 and 120 are first and second permanent magnets that are formed in a substantially U shape with both ends directed in a substantially parallel direction. The extreme part is magnetized to the N or S pole. Both permanent magnets 110 and 120 are fixedly supported in the recess 103 with their magnetic pole ends facing each other. At this time, the magnetic pole ends of the permanent magnets 110 and 120 are so that different magnetic poles face each other, that is, the N extreme part of one permanent magnet faces the S extreme part of the other permanent magnet. Moreover, it is fixedly supported in a state where it is positioned so as to have a required gap between the opposing ends of both ends. In order to position the permanent magnets 110 and 120 on the base member 101, in the embodiment, triangular cutouts 111 and 121 are provided on both end surfaces of the permanent magnets 110 and 120, and the cutouts 111 and 121 are formed on the base member 101. Are fitted into triangular protrusions 104 and 105 provided on the surface.

  The armature 140 is disposed between the pair of first and second permanent magnets 110 and 120. The armature 140 is supported on the base member 101 by a support shaft 141 at the base end, and is horizontal along the support shaft 141, that is, along a surface direction parallel to the bottom surface of the recess 103 of the base member 101. It can be swung. The front end of the armature 140 is configured as a triangular locking claw 142, and the locking claw 142 protrudes from or retracts from one side of the base member 101 as the armature 140 swings. 1, the locking claw 142 can be engaged with the ratchet teeth 15 when protruding, and positioned with respect to the second vane plate 12 so as to be released from the engagement with the ratchet teeth 15 when retracted. It is fixed.

  Although the electromagnet 130 is partially broken in FIG. 2, the electromagnet 130 includes a rectangular core-shaped ferromagnetic core 131 that is penetrated and supported from the proximal end portion to the distal end portion of the armature 140. The both ends of the core 131 in the length direction are positioned in the opposing gaps of the opposite N pole and S pole ends of the pair of permanent magnets 110 and 120, respectively. In addition, a solenoid 132 is formed by winding a conducting wire so as to surround the periphery of the core 131 in the longitudinal direction, and the electromagnet 130 is configured by the solenoid 132 and the core 131.

  Here, the gap formed by the magnetic pole ends of the pair of permanent magnets 110 and 120 is such that the gap dimension located on the distal end side of the armature 140 is larger than the gap dimension located on the proximal end side, As a result, when the armature 140 swings around the support shaft 141, the core 131 of the electromagnet 130 can swing integrally with the armature 140 in both gaps. Both end portions of 131 can be brought close to or in contact with magnetic pole end portions of the pair of permanent magnets 110 and 120. Here, both end parts shall contact each magnetic pole end part of each permanent magnet.

  In the above lock mechanism, when the solenoid 132 of the electromagnet 130 as a movable magnet is energized, the ferromagnetic core 131 is magnetized by the magnetic field generated by the solenoid 132. Here, if energization is performed so that a current flows through the solenoid 132 in a preset direction, as shown in FIG. 2, the core 131 is magnetized at the S pole at the base end and the N pole at the tip end. Is magnetized. Therefore, the base end portion of the core 131 is attracted to the north pole of the second permanent magnet 120, and the tip portion is attracted to the south pole of the same second permanent magnet 120. The armature 140 is swung in the clockwise direction indicated by the arrow in FIG. 2 about the support shaft 141 until it is in contact with and attracted to each magnetic pole end of the permanent magnet 120. At this time, since both ends of the core 131 and the both magnetic pole ends of the first permanent magnet 110 have the same polarity, a repulsive magnetic force is applied between them, and the core 131 swings quickly. . As a result, the engaging claw 142 at the tip of the armature 140 is retracted and retracted into the lock mechanism 10. Even if the current flow to the solenoid 132 is stopped in this state, the second permanent magnet 120 and the core 131 form a closed magnetic circuit, so that the core 131 is maintained in the magnetized state. The electromagnet 130 and the amateur 140 are kept in that state.

  From this state, when energization is performed so that a current flows in the opposite direction to the solenoid 132 of the electromagnet 130, the core 131 is magnetized to the N pole at this time, as shown in FIG. The tip is magnetized to the south pole. Therefore, the proximal end portion of the core 131 is attracted to the south pole of the first permanent magnet 110, the distal end portion is attracted to the north pole of the same first permanent magnet 110, and both end portions of the core 131 are attracted to the first permanent magnet. The armature 140 is swung in the counterclockwise direction indicated by the arrow in the figure about the support shaft 141 until it is in contact with and attracted to both magnetic pole ends of 110. At this time, since repulsive magnetic force is applied between both end portions of the core 131 and both magnetic pole end portions of the second permanent magnet 120, the core 131 is swung quickly. As a result, the locking claw 142 at the tip of the amateur 140 protrudes from the locking mechanism 10. After that, even if the current flow to the solenoid 132 is stopped, the core 131 is configured with the first permanent magnet 110 that is attracted to form a closed magnetic circuit, so that the core 131 maintains the previous magnetized state, The state of the electromagnet 130 is maintained.

  Therefore, in the aperture mechanism of FIG. 1 using the lock mechanism 10, the charge lever 16 is rotated clockwise by the charge mechanism (not shown) to cause the first blade 11 to resist the biasing force of the spring 13 in the P direction. Move to. At the same time, the second blade 12 is moved in the Q direction. At this time, the aperture has the largest opening area. At this time, in the lock mechanism 10, the electromagnet 130 is oscillated as shown in FIG. 2, and the locking claw 142 is retracted and held in a state released from the meshing with the ratchet teeth 15. . From this state, when the charging force by the charge lever 16 is eliminated by a signal for setting the aperture value inside the camera, the first blade plate 11 starts to move in the Q direction and the second blade plate 12 starts to move in the P direction. The opening changes in the closing direction. Then, as shown in FIG. 4, when the blades 11 and 12 move to the predetermined aperture opening, a current in the opposite direction is passed through the solenoid 132 of the electromagnet 130 to project the latching pawl 142, and the ratchet teeth 15. To mesh. Thereby, the movements of the second blade plate 12 and the first blade plate 11 are locked, and the aperture opening is fixed to the adjustment value.

  As described above, in the lock mechanism of the embodiment, since the distance between the pair of permanent magnets 110 and 120 and the armature 140 is very small, by changing the direction of the current flowing through the electromagnet 130, The electromagnet 130 can be selectively attracted to either one of the permanent magnets 110 and 120, or the other can be maintained even after the current flow is stopped. it can. That is, when it is desired to change the swinging direction of the armature 140, that is, the moving position, the current is instantaneously passed through the electromagnet 130 in the polarity (direction) corresponding to the swinging direction. Can be stopped. Therefore, even if the armature 140 is attracted to any permanent magnet, that is, in a state where the locking claw 142 meshes with the ratchet teeth 15 to fix the aperture opening, or is released from meshing with the ratchet teeth 15. In any case where the first and second blades 11 and 12 can be moved and the aperture opening can be adjusted, it is not necessary to keep the current flowing through the electromagnet 130, and the current consumption is markedly reduced. Can be reduced.

  Further, in the lock mechanism 10, when the electromagnet 130, that is, the armature 140 oscillates in the reciprocating direction between the pair of permanent magnets 110 and 120, it is oscillated by the magnetic force in any direction. Therefore, the spring 303 for urging the armature 302 in one direction as in the prior art shown in FIG. 7 is unnecessary, which is advantageous in reducing the number of parts constituting the lock mechanism. Further, in this lock mechanism 10, since the distance between the armature 140 and the pair of permanent magnets 110 and 120 is very small, the armature 140 can be attracted by a weak electromagnetic force, and the armature 140 is returned to the initial position. 7, for example, the conventional cam mechanism shown in FIG. 7 is not required, which is advantageous in reducing the number of parts and simplifying and downsizing the structure of the lock mechanism. Incidentally, since the magnetic force is inversely proportional to the square of the distance, in the conventional configuration of FIG. 7, a return operation by an external force such as a cam mechanism is indispensable for returning the amateur. In this case, when the armature is swung in either direction, the attractive force by one permanent magnet and the repulsive force by the other permanent magnet act synergistically. It is possible to switch between locking and releasing the lock by swinging.

  FIG. 5 is a configuration diagram of a second embodiment in which the present invention is applied to the same locking mechanism as the first embodiment. In the second embodiment, the first and second pair of electromagnets 210 and 220 are fixedly disposed in the recess 203 of the base member 201 as opposed to each other as a fixed magnet, and an armature 240 is provided between the electromagnets 210 and 220. The base end portion of the base member 201 is swingably supported by the support shaft 241, and a locking claw 242 is provided at the distal end portion. In addition, a rectangular rod-shaped permanent magnet 230 magnetized with N poles and S poles at both ends as a movable magnet is integrally mounted on the armature 240, and both magnetic pole ends of the permanent magnet 230 are connected to the electromagnets 210 and 220. Are disposed in the opposing gaps of the magnetic pole ends. The pair of electromagnets 210 and 220 has cores 211 and 221 made of a ferromagnetic material formed in a U-shape, and solenoids 212 and 222 are wound around the cores 211 and 221, respectively.

  In the second embodiment, current is selectively passed through one of the solenoids 212 and 222 of the pair of electromagnets 210 and 220 to magnetize the cores 211 and 221 to attract the permanent magnet 230. Force or repulsive force is generated, and the armature 240 on which the permanent magnet 230 is mounted is swung around the support shaft 241. For example, when a current is passed through the first electromagnet 210 and the S and N poles are magnetized as shown in FIG. 5, the permanent magnet 230 swings counterclockwise as indicated by the arrow in FIG. 1 is attracted to the electromagnet 210, and the locking claw 242 protrudes from the base member 201, and is engaged with the ratchet teeth 15 shown in FIG. Even if energization of the first electromagnet 210 is stopped in this state, the attracted state of the permanent magnet 230 is maintained by the closed magnetic path formed by the permanent magnet 230 and the core 211 of the first electromagnet 210, and the locking claw The locked state of the ratchet teeth 15 by 142 is maintained.

  Further, from the state shown in FIG. 5, a current in the opposite direction flows through the solenoid 212 of the first electromagnet 210 of the pair of electromagnets, and a current in the opposite direction flows through the solenoid 222 of the second electromagnet 220. As shown in FIG. 6, as shown in FIG. 6, the polarities of the S and N poles of the core 211 of the first electromagnet 210 are reversed and a repulsive force acts on the permanent magnet 230, and at the same time, the second electromagnet 220 causes the permanent magnet 230. A suction force is generated. As a result, the permanent magnet 230 swings clockwise as indicated by an arrow in the drawing and is attracted to the second electromagnet 220 at both ends of the magnetic pole, and the locking claw 242 is retracted from the base member 201, as shown in FIG. The meshing with the ratchet teeth 15 shown is released. Even if the current supply to the first and second electromagnets 210 and 220 is stopped in this state, the attracted state of the permanent magnet 230 is maintained by the closed magnetic path formed by the permanent magnet 230 and the core 221 of the second electromagnet 220. Thus, the unlocked state of the ratchet teeth 15 by the locking claws 242 is maintained.

  As described above, also in the second embodiment, the swing position of the permanent magnet 230 is changed by instantaneously passing a current through the first and second electromagnets 210 and 220, and the armature 240 is locked and locked. The release can be switched, and after that, even if the current flow is stopped, the swing position of the amateur 240 can be maintained, so that the power consumption can be reduced. Further, as in the first embodiment, a spring or the like for urging the amateur in one direction is unnecessary, and a cam mechanism for returning the amateur to the initial position is unnecessary.

  In the first and second embodiments, the example of the configuration for swinging the armature has been described. However, in the electromagnetic drive device of the present invention, an armature equipped with an electromagnet or a permanent magnet is disposed in a region sandwiched between a pair of permanent magnets or an electromagnet. Of course, as long as the moving position of the armature is changed, the armature can be moved in a linear direction along a direction in which the pair of fixed magnets face each other.

  Further, the electromagnetic drive device of the present invention can be applied not only to the diaphragm mechanism of the camera shown in Embodiment 1, but also as a mechanism element that performs mechanical switching in various electronic devices.

It is a schematic block diagram of the aperture mechanism of the camera to which the electromagnetic drive device of this invention is applied. It is the plane block diagram which fractured | ruptured a part of locking mechanism (electromagnetic drive device) of Example 1 of this invention. It is sectional drawing of the location which follows the AA line of FIG. FIG. 3 is a plan configuration diagram similar to FIG. 2 for explaining the operation of the first embodiment. 6 is a plan configuration diagram of Example 2. FIG. FIG. 6 is a plan configuration diagram similar to FIG. 5 for explaining the operation of the second embodiment. It is a block diagram of an example of the conventional lock mechanism (electromagnetic drive device).

Explanation of symbols

10 Locking mechanism (electromagnetic drive device)
11 First blade 12 Second blade 13 Spring 14 Aperture opening 15 Ratchet teeth 16 Charge lever 101 Base member 110 First permanent magnet (first fixed magnet)
120 second permanent magnet (second fixed magnet)
130 Electromagnet (movable magnet)
140 Amateur 142 Locking Claw 210 First Electromagnet (First Fixed Magnet)
220 Second electromagnet (second fixed magnet)
230 Permanent magnet (movable magnet)
240 amateur 242 claw

Claims (9)

  A pair of fixed magnets arranged opposite to each other, and a movable magnet arranged between the fixed magnets, wherein either the fixed magnet or the movable magnet is composed of an electromagnet, and the other is composed of a permanent magnet, the electromagnet An electromagnetic driving device characterized in that the movable magnet is attracted to either one of the pair of fixed magnets by an attractive magnetic force generated when the magnet is magnetized by passing a current through it.   The pair of fixed magnets is composed of permanent magnets arranged opposite to each other with magnetic poles facing opposite to each other, and the movable magnet is composed of an electromagnet that is magnetized when a current is passed through the electromagnet. The electromagnetic drive device according to claim 1, wherein the electromagnet is attracted to either one of the pair of permanent magnets according to a direction of a flowing current.   In the pair of permanent magnets, magnetic poles having different S poles and N poles are opposed to each other, and both end portions that become S poles or N poles when the electromagnet is magnetized are the magnetic poles of the pair of permanent magnets. The electromagnetic drive device according to claim 2, wherein the electromagnetic drive device is disposed between the electromagnetic drive devices.   Each of the pair of fixed magnets is composed of a pair of electromagnets that are magnetized when an electric current is passed, and the movable magnet is composed of a permanent magnet, and magnetizes one of the pair of electromagnets. The electromagnetic drive device according to claim 1, wherein the permanent magnet is attracted.     The pair of electromagnets can change a magnetic pole facing the magnetic pole of the permanent magnet to an S pole or an N pole by controlling a direction of a current flowing therethrough. Electromagnetic drive device.   6. The electromagnetic drive device according to claim 1, wherein the movable magnet is integrally mounted on an amateur for performing a predetermined action.   The armature is configured to be swingable about a base end portion, and the movable magnet is attracted to one of a pair of fixed magnets as the armature swings. The electromagnetic drive device described.   The armature is configured to be linearly movable in an opposing direction of the pair of fixed magnets, and the movable magnet is attracted to one of the pair of fixed magnets as the amateur moves. The electromagnetic drive device described in 1. 9. The electromagnetic driving device according to claim 6, wherein the amateur constitutes a part of a lock mechanism for locking a diaphragm mechanism of a camera.

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