JPH11133481A - Electromagnetic driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize an electromagnetic driving device. SOLUTION: First and second driving coils 41 and 42 are provided on the rotary drive disk side of a yoke 12 and further, permanent magnets 43 and 44 are attached to a rotary drive disk. The first and second driving coils 41 and 42 are of circuit patterns formed on the surface of a printed circuit board having the surface parallel with the plane surface of the rotary drive disk and made by winding on axes extended in directions perpendicular to the plane surface of the rotary drive disk respectively. The first and second driving coils 41 and 42 are formed so that their driving parts 41a and 42a are adjacent to each other. The permanent magnets 43 and 44 are extended in circular-arc shapes along a disk of the rotary drive disk, in the directions crossing driving parts 41a, 41b, 42a and 42b. The permanent magnets 43 and 44 are disposed to make the N-poles 43N and 44N adjacent to each other. Currents flow though the first/second driving coils 41 and 42, in fixed directions, to rotate the rotary drive disk.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic driving device provided for opening and closing a lens shutter of a compact camera, for example.

[0002]

2. Description of the Related Art Conventionally, as an electromagnetic drive device for a lens shutter, a permanent magnet having an S-pole and an N-pole is fixed to a rotary drive plate along a rotational direction, and by controlling the state of energization of a drive coil, It is known that a rotary driving plate rotates in a predetermined direction, and the aperture blade is driven to open and close in conjunction with the rotation. The rotary drive plate has a circular hole at the center position corresponding to the opening of the shutter, and the drive coil is provided at a position that does not interfere with the circular hole, so that its axis is parallel to the axis of the rotary drive plate. Are located. That is, a part of the drive coil is a drive unit extending in the radial direction of the rotary drive plate,
When a current flows through the drive unit, a rotating force is generated in the permanent magnet, that is, the rotary drive plate.

[0003]

The maximum rotational movement of the rotary drive plate depends on the width of the drive unit of the drive coil. Therefore, in order to open and close the aperture blade by a predetermined amount, the width of the drive unit of the drive coil must be determined accordingly. For this reason, conventionally, the rotary drive plate needs to have a certain size, which has been an obstacle to downsizing of the shutter device.

An object of the present invention is to further reduce the size of an electromagnetic driving device for driving a shutter device and the like.

[0005]

An electromagnetic drive device according to the present invention is provided with a moving member movably provided along a predetermined plane, and is connected to the moving member, and is displaced in conjunction with the movement of the moving member. A driven member, a conductive wire wound around an axis extending in a direction perpendicular to the plane, a pair of driving coils arranged along the plane and adjacent to each other, and attached to the moving member, And a pair of driving coils, a portion formed in a direction intersecting with the moving direction of the moving member is substantially perpendicular to the moving direction of the moving member, and each of the driving coils has a pair of driving magnets. In the coil, the distance between the conductors on the side adjacent to the other coil when viewed from the axis is formed so as to be half of the distance between the conductors on the side opposite to the side adjacent to the other coil. It is specially arranged that To.

Preferably, in the pair of drive coils,
The winding directions of the conductors are opposite to each other.

[0007] Preferably, the pair of drive coils is a printed wiring board having a spiral conductive pattern formed on an insulating substrate.

[0008] The pair of drive coils is, for example, a multilayer printed wiring board having a plurality of copper foil layers on which a conductor pattern is further formed, each conductor pattern being insulated by an insulating layer.

Preferably, in a multilayer printed wiring board,
The winding direction of the conductive pattern formed on the side corresponding to one surface of the insulating layer and the conductive pattern formed on the side corresponding to the other surface of the insulating layer are opposite directions.

The pair of drive coils is, for example, a double-sided printed wiring board in which conductive patterns are formed on both surfaces of a single insulating substrate. Each of the drive coils of the pair of drive coils is formed on one surface of the insulating substrate. The winding directions of the conductor pattern and the conductor pattern formed on the other surface are opposite to each other.

Preferably, when the drive coils of the pair of drive coils are seen through from one surface of the insulating substrate, the direction of current flow is the same.

The moving member has, for example, a disk, and is rotatable around the center of the disk.

Preferably, when the moving member moves, the range of movement of the adjacent poles of the pair of permanent magnets is between the respective axes of the pair of drive coils, and is opposite to the adjacent poles of the pair of permanent magnets. Is in the range between the ends of the pair of drive coils opposite to the adjacent ends and the respective axes.

The permanent magnet extends, for example, in a circumferential direction around the predetermined point at a position away from the predetermined point by a predetermined distance, and is provided on the movable member so as to be rotatable along the circumferential direction. Each of the drive coils has a fan shape centered on a predetermined point.

Preferably, a plurality of combinations of a permanent magnet and a pair of drive coils are provided so as to be symmetrical with respect to a predetermined point, and the permanent magnet of each combination is provided on a moving member.

The driven member is, for example, an aperture of a camera.
The size of the opening formed by the diaphragm blade is adjusted in conjunction with the movement of the moving member.

Further, the electromagnetic drive device according to the present invention includes a first drive coil wound around a first axis extending in a direction perpendicular to a predetermined surface, and a first drive coil wound in a direction perpendicular to the predetermined surface. A second drive coil wound around a second axis extending and disposed along a predetermined surface adjacent to the first drive coil, the second drive coil having an S pole and an N pole, the same pole being adjacent to the second drive coil; And a pair of permanent magnets disposed so as to perform an electromagnetic force generated between the pair of permanent magnets by driving a current through the first and second drive coils. The first and second drive coils may include a distance between the first and second axes along a line along the drive direction, and an end portion of the first drive coil adjacent to the second drive coil. And the distance between the end opposite to the first axis and the first drive center.
The distance between the end opposite to the end adjacent to the drive coil and the second axis is substantially the same.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are plan views showing a lens shutter of a compact camera to which an electromagnetic drive device according to an embodiment of the present invention is applied, FIG. 5 is a longitudinal sectional view thereof, and FIG.
FIG. 3 is a diagram schematically showing a drive coil and a permanent magnet of the electromagnetic drive device. 1 shows a closed state of the shutter, and FIG. 2 shows an open state of the shutter. FIGS. 3 and 4 show only one diaphragm blade, and correspond to FIGS. 1 and 2, respectively.

As shown in FIG. 5, the fixed housing 11 has a bottomed cylindrical shape, a circular hole 11b is formed at the center of the bottom plate 11a, and a disk-shaped yoke is formed at the opening edge of the cylindrical portion 11c. 12 are fitted. At the center of the yoke 12, a circular hole 12a having substantially the same size as the circular hole 11b of the fixed housing 11 is formed. The fixed housing 11 is formed of, for example, a synthetic resin, and the yoke 12 is formed of, for example, a magnetic material such as an iron alloy.

In the space formed by the fixed housing 11 and the yoke 12, there is provided a rotary driving plate 13 serving as a moving member.
Is housed. The rotary driving plate 13 has a disk 13a having substantially the same size as the yoke 12, and a cylinder 1 having an inner diameter slightly smaller than the circular holes 11b and 12a in the center of the disk 13a.
3b is provided. The rotary drive plate 13 is supported by the fixed housing 11 via a bearing (not shown), and is rotatable around its axis.

As shown in FIGS. 1 and 2, between the bottom plate 11a of the fixed housing 11 and the disk 13a of the rotary drive plate 13, three aperture blades 14, 1
5 and 16 are provided. Aperture blades 14, 15, 16
Are provided with pins 14a, 15a, 16a, and these pins 14a, 15a, 16a are rotatably supported by the fixed housing 11. That is, the aperture blades 14, 1
5 and 16 are rotatable with respect to the fixed housing 11.

As shown in FIGS. 3 and 4, the rotary drive plate 13 has three circumferential slits 13 extending in the circumferential direction.
c, 13d, and 13e, and three radial slits (cam grooves) 13f, 13g, and 13h extending in the radial direction are formed. The circumferential slits 13c, 13d, and 13e are provided at equal intervals in the circumferential direction, and the radial slits 13f,
3g and 13h are also provided at equal intervals in the circumferential direction. The circumferential slit 13c is between the radial slits 13h and 13f, and the circumferential slit 13d is a radial slit 13f.
13g, the circumferential slit 13e is arranged between the radial slits 13g, 13h.

The pins 14a of the aperture blades 14, 15, 16
15a, 16a are circumferential slits 13c, 13d, 13
e. Also, pins 14b, 15b, 16 are provided on the surfaces of the aperture blades 14, 15, 16 on the side of the rotary drive plate 13.
b, these pins (cam followers) 14b,
15b, 16b are radial slits 13f, 13g, 13
h is slidably supported. That is, the aperture blade 1
4, 15, 16 are connected to the rotary drive plate 13 via pins 14b, 15b, 16b.

The diaphragm blade 14 is formed by rounding each corner of a substantially triangular plate and providing an arc-shaped notch 14c at a position shifted from the center of one side of the triangle to one corner. You. The pins 14a and 14b are provided near the two corners on the side where the notch 14c is not provided. The other diaphragm blades 15 and 16 have the same configuration, and are formed with arc-shaped notches 15c and 16c, respectively.

When the rotary drive plate 13 is at the position shown in FIGS. 1 and 3, the pins 14b, 15b, 16b engage with the inner ends of the radial slits 13f, 13g, 13h, and the aperture blades 14, 15,. Reference numeral 16 denotes a position rotated clockwise, and an opening formed by the opening of the cylinder 13b, the circular hole 11b of the fixed housing 11, and the circular hole 12a of the yoke 12 (hereinafter, “unit opening”) is closed. ing. At this time, the pins 14a, 15a, 16a are locked to one ends of the circumferential slits 13c, 13d, 13e, thereby preventing the rotation drive plate 13 from further rotating clockwise. The aperture blades 14, 15,
Numeral 16 is superimposed so that the aperture blade 14 is located closest to the fixed housing 11 and the aperture blade 16 is located closest to the rotary drive plate 13. That is, the unit aperture is the aperture blade 1
Blocked by 4, 15 and 16.

When the rotary drive plate 13 rotates counterclockwise from the position shown in FIGS.
When the pins 14b, 15b, and 16b rotate counterclockwise, the pins 14b, 15b, and 16b
f, 13g, and 13h.
5 and 16 rotate counterclockwise. With this rotation, the overlapping area of the aperture blades 14, 15, 16 becomes smaller, and eventually an opening is formed by the notches 14c, 15c, 16c, and the size of this opening depends on the amount of rotation of the rotary drive plate 13. It is getting bigger. Then, as shown in FIG. 4, the pins 14b, 15b, 16b
3g, 13h, and engage with the outer ends of the aperture blades 14, 1
Reference numerals 5 and 16 are located at positions rotated counterclockwise, and the unit openings are opened. At this time, the pins 14a, 15a, 1
6a is locked to the other end of the circumferential slits 13c, 13d, 13e, thereby preventing the rotation drive plate 13 from rotating further in the counterclockwise direction.

In order to rotate the rotary drive plate 13, the first and second drive coils 4 are provided on the rotary drive plate side of the yoke 12.
1 and 42 are provided, and permanent magnets 43 and 44 are attached to the rotary drive plate 13. A multilayer printed wiring board is used for the first and second drive coils 41 and 42. The multilayer printed wiring board is a laminated body having a plurality of layers on which a conductor pattern is formed, and each layer on which the conductor pattern is formed is insulated from each other by an insulating layer such as a resin. Drive coils 41, 4
2 are formed. Such a multilayer printed wiring board 40
Are arranged such that the plane thereof is parallel to the rotary drive plate 13.

FIG. 7 is an enlarged view of the first and second drive coils 41 and 42 of FIG. First drive coil 41
Is a direction perpendicular to the plane of the rotary drive plate 13, that is, FIG.
7, and is wound around a first axis 41d extending in a direction perpendicular to the plane of FIG. Similarly, the second drive coil 42 is wound around a second axis 42d.

The first drive coil 41 includes drive units 41 a and 41 b extending along the radial direction of the yoke 12 and the yoke 1.
And an outer peripheral portion 41c extending along the outer peripheral edge of the second outer peripheral portion. Similarly, the second drive coil 42 includes drive units 42a and 42
b, and an outer peripheral portion 42c. Further, the first and second drive coils 41 and 42 are formed such that the drive unit 41a and the drive unit 42a are adjacent to each other. Also, the first
Each of the second drive coils 41 and 42 has a sector shape centered on a point on the central axis of the unit opening.

The permanent magnets 43 and 44 are positioned at a predetermined distance from a point on the central axis of the unit opening, and are arranged in a circumferential direction around the point, that is, the driving units 41a, 41b,
It extends in a direction intersecting with 42a and 42b. The permanent magnets 43 and 44 have substantially the same length, and are arranged such that the N poles 43N and 44N are adjacent to each other. The length from the S pole 43S of the permanent magnet 43 to the S pole 44S of the permanent magnet 44 is equal to the length of the driving unit 4 of the first driving coil 41.
1b, the driving portion 42b of the second driving coil 42 extends from the edge 41e on the side opposite to the edge 41e near the winding axis.
Is substantially equal to the length up to the edge 42e near the winding axis (see FIG. 7).

When the rotary drive plate 13 rotates, the permanent magnets 43 and 44 allow the adjacent N poles 43N and 44N to move between the first shaft center 41d of the first drive coil 41 and the second drive coil 42.
Of the permanent magnet 43, the S pole 43S of the permanent magnet 43 always moves between the edge 41e and the edge 41f of the driving portion 41b of the first driving coil 41. S
The pole 44S is disposed so as to always move between the edge 42e and the edge 42f of the drive section 42b of the second drive coil 42.

FIG. 8 is a view transparently showing a conductor pattern corresponding to the first and second drive coils 41 and 42 on one insulating substrate of the laminate constituting the multilayer printed wiring board 40. FIG. 9 is an exploded view of the insulating substrate. The portion indicated by the solid line is a conductive wire pattern formed on the surface 50A on the disk 13a side of the rotary drive plate 13 in the insulating substrate 50, and the portion indicated by the broken line is the insulating substrate 50.
5 is a conductor pattern formed on the surface 50B on the yoke 12 side. The conductive wire patterns formed on the surfaces 50A and 50B are formed in a spiral shape so as not to overlap with each other when viewed from a direction perpendicular to the surfaces 50A and 50B. When viewed from a direction orthogonal to the surfaces 50A and 50B, the winding direction of the conductive pattern of the first drive coil 41 and the winding direction of the conductive pattern of the second drive coil 42 are opposite to each other. In each of the drive coils, the winding pattern of the conductive pattern formed on the surface 50A and the winding direction of the conductive pattern formed on the side corresponding to the surface 50B are opposite to each other. Further, each of the driving units 41a, 41b, 42
The circuits corresponding to a and b are in the direction perpendicular to the rotation direction of the rotary drive plate 13, that is, the disk 13 of the rotary drive plate 13.
It is formed along the radial direction of a.

The pitch P1 of the conductor pattern of the driving portions 41a, 42a of the first and second driving coils 41, 42
Is the pitch P of the conductor pattern of the driving units 41b and 42b.
About half of 2. Accordingly, the first and second shaft centers 41d, 4d,
2d and the driving unit 41 of the first driving coil 41
The distance between the edge 41f of b and the first axis and 41d is substantially the same as the distance between the edge 42f of the drive section 42b of the second drive coil 42 and the second axis 42d. In other words, the first
Edges 41e, 41f of the drive section 41b of the drive coil 41 of FIG.
X, the edge 4 of the driving portion 41a of the first coil 41
1g, the angle Y formed by the edge 42g of the drive section 42a of the second coil 42, and the drive section 42b of the second drive coil 42
The angles Z formed by the edges 42e and 42f are substantially the same.

In the first drive coil 41, the end 41h near the first axis 41d of the conductor pattern formed on the surface 50A of the insulating substrate 50 and the first axis of the conductor pattern formed on the surface 50B. The end 41i near the core 41d is electrically connected via an IVH (Inner Via Hole) not shown. Similarly, in the second drive coil 42, an end 42h near the second axis 42d of the conductor pattern formed on the surface 50A and an end 42h near the second axis of the conductor pattern formed on the surface 50B. The unit 42i is electrically connected via an IVH (not shown).

Referring to FIG. 9, the winding directions of the first and second drive coils 41 and 42 and the current flow will be described. FIG. 9 is an exploded view of the insulating substrate 50. First
The direction of winding of the second drive coils 41 and 42 is such that the direction of current flow is the same for both the surfaces 50A and 50B of the insulating substrate 50 in the drive units 41a and 42a, that is, orthogonal to the surfaces 50A and 50B. It is formed so that the direction in which current flows when viewed through from the same direction. As shown in FIG. 9, for example, the first drive coil 41
When a current is passed in the α direction to the
a flows from the circular hole 12a to the outer peripheral edge of the yoke 12, and the current flowing through the driving portion 42a of the second drive coil 42 similarly flows from the circular hole 12a to the outer peripheral edge of the yoke 12. Further, also on the surface 50B, the current flowing through the driving portions 41a and 42a of the first and second driving coils 41 and 42 flows from the circular hole 12a to the outer peripheral edge of the yoke 12. on the other hand,
In this case, the direction of the current flowing through the drive units 41b and 42b of the first and second drive coils 41 and 42 is the surface 50A,
50B, a circular hole 1 is formed from the outer peripheral edge of the yoke 12.
2a.

Conversely, when a current is applied to the first drive coil 41 in the β direction on the surface 50A, the current flowing through the drive section 41a flows from the outer peripheral edge of the yoke 12 to the circular hole 12a, and the second drive coil 42 The same applies to the direction of the current flowing through the drive section 42a. Also on the surface 50B, the current flowing through the driving portions 41a and 42a of the first and second driving coils 41 and 42 flows from the outer peripheral edge of the yoke 12 to the circular hole 12a. On the other hand, in this case, the first and second drive coils 4
The currents flowing through the drive units 41b and 42b of the first and second components go from the circular hole 12a to the outer peripheral edge of the yoke 12.

A multilayer printed wiring board 40 is obtained by laminating a plurality of insulating substrates having the same configuration as the above-described insulating substrate 50 with an insulating layer interposed therebetween and by thermocompression bonding. Each conductor pattern is electrically connected via an IVH. Note that the multilayer printed wiring board 40 may be formed by a build-up method in which an insulating layer and a copper foil layer are sequentially stacked, in addition to stacking a plurality of insulating substrates each having a conductor pattern formed on both surfaces. After being laminated on the insulating layer, a conductive pattern having the same configuration as the above-described conductive pattern is formed on the copper foil layer. Similarly, the conductor patterns of each layer are electrically connected via IVH. Further, instead of the multilayer printed wiring board, a double-sided printed wiring board having conductor patterns formed on both surfaces of a single insulating substrate may be used.

As shown in FIG. 6, the combination of the permanent magnet and the driving coil as described above
, That is, symmetrically with respect to the center of rotation of the disk 13 a of the rotary drive plate 13. By providing a plurality of combinations of the permanent magnets and the drive coils, the driving force on the rotary driving plate 13 is increased, and by arranging them in point symmetry, the manner of applying the driving force on the rotary driving plate 13 becomes uniform. The rotation operation of the rotation drive plate 13 becomes smooth. The combination of the permanent magnet and the drive coil is not limited to two, and three or more combinations may be provided as long as they are symmetrically arranged with respect to the center of rotation of the disk 13a.

Next, the operation of the present embodiment will be described. FIG.
FIG. 4 is a diagram schematically showing a positional relationship between first and second drive coils 41 and 42 and permanent magnets 43 and 44. When no current is supplied to the first and second drive coils 41 and 42, the S pole 4 of the permanent magnet 43 is turned off as shown in FIG.
3S is located at the end of the drive section 41b of the first drive coil 41 opposite to the vicinity of the center of the winding and opposite to the permanent magnet 4
The N pole 43N of No. 3 and the N pole 44N of the permanent magnet 44 are located at the end near the center of the winding in the drive unit 41a. Further, the S pole 44S of the permanent magnet 44 is located at the end near the center of the winding in the drive section 42b of the second drive coil 42. At this time, as shown in FIG. 1 and FIG. 3, the rotary drive plate 13 is at a position rotated relatively clockwise, and the apertures of the units are closed by the aperture blades 14, 15, and 16.

When a current is supplied in the α direction, a counterclockwise rotating force acts on the rotary drive plate 13,
The permanent magnets 43 and 44 also start to move with the start of the rotation of the motor, and the relative positional relationship between the first and second drive coils 41 and 42 and the permanent magnets 43 and 44 is, for example, as shown in FIG. Become. When the current is continuously supplied in the α direction, the rotary drive plate 13 further rotates counterclockwise, and the permanent magnet 4
The positional relationship between 3, 3 and the first and second drive coils 41, 42 is as shown in FIG. That is,
The S pole 43S of the permanent magnet 43 is located at an end near the center of the winding in the driving section 41b of the first driving coil 41, and has the N pole 43N of the permanent magnet 43 and the N pole of the permanent magnet 44.
The pole 44N is located at an end near the center of the winding in the driving section 42a of the second driving coil. The S pole 44S of the permanent magnet 44 is connected to the drive unit 4 of the second drive coil 42.
2b, it is located at the end opposite to the vicinity of the center of the winding. At this time, as shown in FIGS. 2 and 4, the rotary drive plate 13 is at a position rotated relatively counterclockwise, and the apertures of the aperture blades 14, 15, 16 are opened.

In this state, when a current is supplied in the β direction, a clockwise rotational force acts on the rotary drive plate 13. Thereby, the first and second drive coils 41, 4
The relative positional relationship between the permanent magnets 2 and the permanent magnets 43 and 44 changes from the state of (c) to the state of (a) through the state of (b) according to the rotation of the rotary drive plate 13. Permanent magnets 43, 44
Rotate to the position shown by the solid line in FIG.
The unit openings are closed by 5 and 16.

As described above, the pitch P1 of the wire patterns of the drive portions 41a and 42a of the first and second drive coils 41 and 42 is about half of the pitch P2 of the wire patterns of the drive portions 41b and 42b. Because of this (see FIG. 8), the total width W1 of the driving units 41a and 42a and the width W of the driving unit 41b
2. The width W3 of the drive section 42b is substantially the same. as a result,
At the time of the rotation operation of the rotary drive plate 13, that is, the N pole 43N of the permanent magnet 43 and the N pole 44N of the permanent magnet 44
When moving over a distance straddling the drive unit 42a, the S pole 43S of the permanent magnet 43 and the S pole 44S of the permanent magnet 44 are always located on the drive unit 41b and the drive unit 42b, respectively. That is, the state in which the magnetic fluxes of the permanent magnets 43 and 44 always pass through the respective drive units of the first and second drive coils 41 and 42 is maintained, so that the position of the permanent magnets 43 and 44, that is, the position of the rotary drive plate 13 Irrespective of this, the generated driving force is applied to the rotary driving plate 13 constantly and without bias.

As described above, in this embodiment, the aperture blade 1
The apertures 4, 15, and 16 are opened and closed in conjunction with the rotation of the rotary drive plate 13. When the present invention is applied to the aperture device, the intensity of the coil current is controlled according to the rotational displacement of the aperture blade. By doing so, the opening degree of the throttle can be adjusted to a predetermined value. Further, according to the present embodiment, the aperture blades 14, 15, 1
The outer diameter of the electromagnetic drive device can be greatly reduced as compared with the conventional device while maintaining the opening / closing stroke of 6 at a predetermined size.

According to the present embodiment, the conductor pattern of the multilayer printed wiring board 40 is used as the drive coil. Since such a conductive wire pattern is formed by etching a copper foil laminated on the surface of an insulating substrate or the like, the degree of design freedom is high. That is, each drive unit of each drive coil is formed with a predetermined pitch so that the first and second drive coils 41 and 42 have a sector shape centered on a point on the central axis of the unit opening as a whole. It is easy to do.

As a result, the driving units 41a, 41b, 42
a, 42b are formed in a direction perpendicular to the driving direction of the rotary driving plate 13, and the magnetic fluxes of the permanent magnets 43, 44 always drive the driving portions 41a, 41b, 42a of the first and second driving coils. , 42b is maintained. That is, the driving units 41a, 41b, 42
a, 42b and the permanent magnets 43, 44 passing therethrough
Are maintained such that the directions of the magnetic fluxes are always orthogonal. Therefore, the electromagnetic force generated when a current flows through the conductor pattern of each drive unit can be efficiently used as the drive force. In addition, the cost is lower and more economical than when a similar drive coil is formed by winding a fine wire.

On the other hand, it is very difficult to partially change the pitch of the winding of a conventional coil formed only by winding of a conductive wire, and usually the same coil width is used in all parts. I have. Therefore, in order to obtain the same drive stroke as the drive device of the present embodiment by using a coil configured only by winding the conductive wire in the coil of the electromagnetic drive device, it is necessary to increase the width of the coil. Accompanying this, the outer dimensions of the coil are increased, which hinders miniaturization of the entire electromagnetic drive device.

In the coil formed by winding the conductive wire, the winding direction is not parallel to a line extending in the radial direction of the driving plate from the center of rotation by increasing the width of the coil, that is, the driving direction. As the portion that is not orthogonal to the direction increases outward, the driving force in the rotating direction caused by the energization is reduced.

[0048]

As described above, according to the present invention, the size of the electromagnetic drive device can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing a lens shutter according to an embodiment of the present invention, showing a closed state.

FIG. 2 is a plan view showing an open state of a lens shutter shown in FIG.

FIG. 3 is a plan view showing the same state as FIG. 1 and showing only one diaphragm blade.

FIG. 4 is a plan view showing the same state as FIG. 2 and showing only one diaphragm blade.

FIG. 5 is a longitudinal sectional view of the lens shutter shown in FIG.

FIG. 6 is a plan view showing an arrangement of coils of the lens shutter shown in FIG.

FIG. 7 is an enlarged view of the drive coil of FIG.

FIG. 8 is a perspective view showing a conductive wire pattern of a drive coil.

FIG. 9 is an exploded perspective view of a printed wiring board on which a drive coil is formed.

FIG. 10 is a schematic diagram showing a positional relationship between a drive coil and a permanent magnet.

[Explanation of symbols]

 12 Yoke 13 Rotary drive plate 14, 15, 16 Aperture blade 41 First drive coil 42 Second drive coil 43, 44 Permanent magnet

Claims (14)

[Claims] A moving member movably provided along a predetermined plane; a driven member coupled to the moving member and displaced in conjunction with movement of the moving member; and a direction perpendicular to the plane. And a pair of driving coils arranged along the plane and adjacent to each other, attached to the moving member, and having an S pole and an N pole along the moving direction. A pair of drive coils, a portion formed in a direction intersecting the moving direction of the moving member is substantially orthogonal to the moving direction of the moving member, and the axis of each driving coil is When viewed from the viewpoint, the interval between the conductors on the side adjacent to the other coil is formed to be half of the interval between the conductors on the side opposite to the side adjacent to the other coil, and the pair of permanent magnets are arranged so that the same poles are adjacent to each other. It is special that Electromagnetic driving device according to. 2. The electromagnetic drive device according to claim 1, wherein, in the pair of drive coils, winding directions of the conductive wires are opposite to each other. 3. The electromagnetic drive device according to claim 2, wherein the pair of drive coils are printed wiring boards having a spiral conductive pattern formed on an insulating substrate. 4. The multi-layer printed wiring board according to claim 1, wherein the pair of drive coils further include a plurality of copper foil layers on which a conductor pattern is formed, and each conductor pattern is insulated by an insulating layer. Item 4. The electromagnetic drive device according to item 3. 5. A winding of a conductive pattern formed on a side corresponding to one surface of the insulating layer and a conductive pattern formed on a side corresponding to the other surface of the insulating layer in the multilayer printed wiring board. The electromagnetic drive device according to claim 4, wherein the direction is a reverse direction. 6. The electromagnetic drive device according to claim 3, wherein the pair of drive coils is a double-sided printed wiring board having the conductor pattern formed on both surfaces of a single insulating substrate. 7. In each of the driving coils of the pair of driving coils, the winding directions of the conductive wire pattern formed on one surface of the insulating substrate and the conductive wire pattern formed on the other surface are opposite to each other. The electromagnetic drive device according to claim 6, wherein: 8. The electromagnetic drive device according to claim 3, wherein when the respective drive coils of the pair of drive coils are seen through from one surface of the insulating substrate, the current flows in the same direction. . 9. The apparatus according to claim 1, wherein the moving member has a disk, and is rotatable around the center of the disk.
3. The electromagnetic drive device according to 1. 10. The moving range of an adjacent pole of the pair of permanent magnets when the moving member moves is between respective axes of the pair of drive coils, and is adjacent to the pair of permanent magnets. 2. The electromagnetic drive according to claim 1, wherein a moving range of the pole on the opposite side of the pole is between an end of the pair of drive coils opposite to an adjacent end and each axis. 3. apparatus. 11. The moving member according to claim 1, wherein the permanent magnet extends in a circumferential direction around the predetermined point at a position away from a predetermined point by a predetermined distance, and is attached to the moving member so as to be rotatable along the circumferential direction. The electromagnetic drive device according to claim 1, wherein each of the drive coils of the pair of drive coils has a fan shape centered on the predetermined point. 12. A plurality of combinations of the permanent magnet and the pair of drive coils are provided so as to be symmetrical with respect to the predetermined point, and the permanent magnet of each combination is provided on the moving member. The electromagnetic drive device according to claim 11, wherein: 13. The apparatus according to claim 12, wherein the driven member is a diaphragm of a camera, and a size of an opening formed by the diaphragm blade is adjusted in conjunction with movement of the moving member. Electromagnetic drive. 14. A first driving coil wound around a first axis extending in a direction perpendicular to a predetermined plane, and a second driving coil wound around a first axis extending in a direction perpendicular to the predetermined plane. And a second drive coil disposed adjacent to the first drive coil and disposed along the predetermined surface, and having a south pole and a north pole, and disposed so that the same pole is adjacent to the second drive coil. An electromagnetic drive device comprising: a pair of permanent magnets, wherein an electromagnetic force generated between the pair of permanent magnets by applying a current to the first and second drive coils is used as a driving force. 1st and 2nd
Of the first coil along a line along the driving direction.
A distance between an end of the first drive coil opposite to an end adjacent to the second drive coil, and a distance between the first axis and the second axis. An electromagnetic drive device, wherein a distance between an end opposite to an end adjacent to the first drive coil and the second axis is substantially equal to each other.