KR100936417B1 - Electromagnetic actuator - Google Patents

Abstract

The upper cover 15 is provided with an end portion 15f facing the circuit board 16 around the support portion 15d that supports the rotation shaft 17. Moreover, the recessed part which a part of rotor 11 enters is formed in the inner surface of 15 d of support parts. In addition, through holes 14a, 14b, 15a, and 15b, which are holes into which lower and upper portions of the coils 13a and 13b enter, are formed in the lower cover 14 and the upper cover 15, respectively. By this structure, miniaturization of the axial direction of the rotating shaft 17 is realized. Moreover, the adhesive layer 20 comprised from the adhesive used for bonding the circuit board 16 to the upper cover 15 is also provided in the part which the circuit board 16 blocks the through-holes 15a and 15b. The adhesive on the surface of the pressure-sensitive adhesive layer 20 can adhere foreign substances coming from the through holes 14a and 14b of the lower cover 14 or a gap between the lower cover 14 and the upper cover 15 to the adhesive surface. have.

Electromagnetic actuators, rotors,

Description

Electromagnetic Actuator {ELECTROMAGNETIC ACTUATOR}

The present invention relates to an electromagnetic actuator.

A step motor is used as an electromagnetic actuator for driving shutters of small cameras mounted on portable electronic devices such as mobile phones. As such a step motor, a small one is preferable.

An example of the step motor for a small camera is disclosed by Unexamined-Japanese-Patent No. 2001-061268 (following patent document 1). The step motor includes a coil in a pair of stators formed in a U shape to reduce the area of the plane.

Moreover, the motor disclosed in Unexamined-Japanese-Patent No. 2003-032991 (following patent document 2) has a structure by which the coil was wound directly on a pair of stators formed in U shape.

[Problem to Solve Invention]

When the step motor disclosed in Patent Document 1 described above is protected by a case, the whole of the step motor becomes thick in the axial direction of the rotating shaft due to the thickness of the case. In addition, there is a problem that dust and the like is easy to enter if not protected by the case.

On the other hand, the step motor disclosed in Patent Document 2 described above has a structure in which foreign matter such as dust easily enters the case of the step motor. If foreign matter enters the gap between the rotor and the stator, the rotational accuracy of the stepper motor is lowered, which may cause rotational failure. In addition, if the step motor is protected by a case to prevent foreign matter from entering, the overall size becomes large.

It is an object of the present invention to provide a miniaturized electromagnetic actuator in view of the above circumstances.

Moreover, an object of this invention is to provide the electromagnetic actuator which a foreign material does not easily enter.

In addition, another object of the present invention is to provide an electromagnetic actuator that maintains high rotational accuracy and is unlikely to cause rotational failure.

[Means for solving the problem]

In order to achieve the above object, the electromagnetic actuator according to the first invention,

Rotor rotating around the axis of rotation, a stator facing the rotor, a coil wound around the stator, a support portion for supporting the rotation axis of the rotor on the inner side facing the rotor, formed around the support portion and the support portion And an upper cover having an end formed more concave than an outer surface, and a circuit board disposed at the end of the upper cover and having a circuit connected to the coil.

Moreover, the inner surface of the said support part may be more concave than the inner surface of the said end part, and a part of the rotor may enter.

The upper cover may be provided with an avoidance hole in which a portion of the coil enters the end portion.

The circuit board may be arranged so as to close the avoidance hole.

Moreover, the winding part of the said stator in which the said coil was wound may be made so that the surface of the side where the said circuit board is arrange | positioned is formed lower than the circumference | surroundings.

In addition, a lower cover may be further provided on the opposite side of the upper cover as viewed from the stator, and the lower cover may include a support portion for supporting the rotating shaft and an avoidance hole into which a part of the coil enters.

The electromagnetic actuator according to the second invention,

A rotor that rotates about a rotating shaft, a stator facing the rotor, a coil wound on the stator, an upper cover which fixes the stator and supports the rotating shaft and has a avoidance hole into which a part of the coil enters; An adhesive layer is provided between at least a portion of the portion facing the hole and an adhesive portion, and the adhesive portion is bonded to the upper cover by an adhesive of the adhesive layer to connect the circuit to the coil. It is characterized by including a circuit board to be provided.

It is preferable that the pressure-sensitive adhesive layer is provided on all surfaces of the circuit board in contact with the upper cover.

As the material of the pressure-sensitive adhesive layer may be applied a thermosetting acrylic pressure-sensitive adhesive.

[Effects of the Invention]

According to the present invention, it is possible to provide a miniaturized electromagnetic actuator by having an end portion in the cover. In the case where the through hole is provided, since the through hole is blocked by the circuit board, it is difficult for dust or the like to enter inside the electromagnetic actuator. In addition, by attaching foreign substances such as dust or contaminants to the pressure-sensitive adhesive, it is possible to provide an electromagnetic actuator capable of maintaining rotational accuracy and preventing occurrence of rotational defects.

1 is an exploded perspective view showing a configuration of an electromagnetic actuator according to an embodiment of the present invention;

2 is a perspective view showing the overall configuration of the electromagnetic actuator shown in FIG.

FIG. 3 is a cross-sectional view of a drive device including the electromagnetic actuator shown in FIG. 2 (for the electromagnetic actuator, a cross-sectional view indicated by arrows in the line AA ′ of FIG. 2).

4 is a perspective view showing a configuration of a stator included in the electromagnetic actuator shown in FIG. 1;

5 is a block diagram of a control circuit for controlling the electromagnetic actuator according to the embodiment of the present invention.

<Code description>

10: electromagnetic actuator

11: rotor

12: stator

12a to 12c: extreme

12d, 12e: coil winding part

13a, 13b: coil

14: lower cover

14a, 14b: through hole

15: top cover

15a, 15b: through hole

15d: support

15e: bearing hole

15f: end

16: circuit board

17: axis of rotation

20: adhesive layer

30: drive lever

31a, 31b: sector

40: drive device

EMBODIMENT OF THE INVENTION The electromagnetic actuator which concerns on embodiment of this invention is demonstrated with reference to the following drawings.

The electromagnetic actuator 10 is a stepping motor of permanent magnet type (PM (Permanent Magnet) type). The electromagnetic actuator 10 rotates the driving object mounted on the rotor by the rotation of the rotor.

As shown in FIGS. 1 to 3, the electromagnetic actuator 10 includes a rotor 11, a stator 12, a coil 13, a lower cover 14 and an upper cover (that constitute a pair of covers (cases)). 15), the circuit board 16 and the adhesive layer 20 are provided.

The rotor 11 rotates about the rotating shaft 17 by the rotational torque which arises by the magnetic force between the stator 12 and it. The rotor 11 is formed of a magnetic material such as rare earth or iron, for example, and is configured in the form of a cylindrical or disc of a small diameter having a diameter of about 2 mm to 10 mm. In the center of the rotor 11, the rotation shaft 17 is integrally formed with the rotor 11. In addition, the rotating shaft 17 may be formed separately from the rotor 11 and may be fixed to penetrate through the center of the rotor 11. The rotor 11 has a plurality of magnetic poles whose polarities alternately rotate in the rotational direction. These magnetic poles are provided at regular intervals along the rotational direction of the rotor 11.

The stator 12 is for leading the magnetic flux generated in the excited magnetized coil 13 to the magnetized magnetic pole of the rotor 11. The stator 12 is formed of a soft magnetic material, for example. The stator 12 is formed in a C shape as shown in FIG. 4. Both end portions of the stator 12 are formed in a hook shape. The hook-like portion constitutes extremes 12a and 12b that are magnetized by energizing the coil 13. Moreover, the center part of the stator 12 is formed in convex shape, and comprises the extreme value 12c magnetized by the coil 13 energizing. The stator 12 constitutes a three-pole stator. The three extremes 12a, 12b and 12c of the stator 12 are arranged to oppose the magnetic poles provided in the rotor 11.

The coil 13 excites (magnetizes) the stator 12 by being excited (magnetized) by applying a positive or negative current. The coil 13 is comprised by the coil 13a and the coil 13b. The coil 13a is wound around the coil winding 12d between the extreme value 12a and the extreme value 12c of the stator 12. The coil 13b is also wound by the coil winding part 12e between the extreme value 12b and the extreme value 12c. In addition, the coils 13a and 13b may be provided by inserting a coil wound in advance into the stator 12.

The coils 13a and 13b are wound directly on the coil windings 12d and 12e of the stator 12 without using coil bobbins. Therefore, the diameter of the coil can be made smaller by the thickness of the coil bobbin. As a result, miniaturization of the electromagnetic actuator 10 in the direction of the rotation axis 17 can be achieved. In addition, as shown in FIG. 4, the coil winding part 12d, 12e is formed in the surface on the side in which the circuit board 16 is provided lower than the circumference | surroundings. For this reason, when the coil 13 is based on the stator 12 center, the upper cover 15 side is relatively lower than the lower cover 14 side. The end part 15f of the upper cover 15 mentioned later can be made to approach the lower cover 14 side of a rotor axial direction by that much. For this reason, the circuit board 16 is provided on the edge part 15f of the upper cover 15, and even if the thickness increases only as much as the circuit board 16, the increase in the thickness of the electromagnetic actuator 10 whole can be suppressed. As a result, the miniaturization of the electromagnetic actuator 10 in the direction of the rotation axis 17 is achieved.

The lower cover 14 and the upper cover 15 rotatably support the rotating shaft 17 of the rotor 11. In addition, the lower cover 14 and the upper cover 15 fix the stator 12 and the like on which the rotor 11 and the coil 13 are wound. The lower cover 14 supports the lower side of the rotary shaft 17, and the upper cover 15 supports the upper side of the rotary shaft 17. The lower cover 14 and the upper cover 15 are coupled to each other to support the rotation shaft 17 of the rotor 11 so as to rotatably fix the stator 12.

The lower cover 14 is formed with through holes 14a and 14b which are holes into which the lower part of the coil 13 wound on the stator 12 (part of the lower cover 14 side) enters. In addition, the lower cover 14 is provided with a plurality of protrusions 14c and 14d and bearing holes 14e serving as supports. The plurality of convex portions 14c are coupled to the plurality of concave portions 15c formed on the upper cover 15 to couple the lower cover 14 and the upper cover 15. The plurality of convex portions 14d are coupled to the plurality of concave portions 12f formed in the stator 12. The rotating shaft 17 penetrates through the bearing hole 14e.

The through holes 14a and 14b are formed at positions facing each other with respect to the bearing hole 14e. The lower part of the coil 13 (part of the lower cover 14 side) so that the through holes 14a and 14b can accommodate the lower part of the coils 13a and 13b (part of the lower cover 14 side). It is formed to a minimum size in a range that does not contact with. In addition, the perimeter of the through-holes 14a and 14b is formed in the shape of a taper in conformity with the curved surface of the lower part (part of the lower cover 14 side) of the wound coil 13. This also reduces the size of the electromagnetic actuator 10 in the direction of the rotation axis 17.

The upper cover 15 is formed with a supporting portion 15d for rotatably supporting the rotating shaft 17 and an end portion 15f formed around the supporting portion 15d. The supporting portion 15d is formed to cover the rotor 11 and the end portion 15f is formed to cover the stator 12 to protect them.

Near the center of the inner surface (surface opposite to the rotor 11) of the supporting portion 15d, one end of the rotary shaft 17 is inserted and a bearing hole 15e for supporting the rotary shaft 17 is provided. The outer surface (opposite side of the surface opposite to the rotor 11) of the supporting portion 15d is shaped to protrude to the outer side (the substrate 16 side) with respect to the end portion 15f. The outer surface of the end portion 15f (opposite side of the surface opposing the stator 12) is concave on the basis of the outer surface of the support portion 15d (opposite side of the surface opposing the rotor 11), and the circuit board ( 16) is stored.

Corresponding to the outer shape of the supporting portion 15d and the end portion 15f, the inner surface (surface facing the rotor 11) of the supporting portion 15d is more concave than the inner surface of the end portion 15f (surface facing the stator 12). It is supposed to be done. The upper part of the rotor 11 is accommodated in such a recess. By this, miniaturization of the direction of the rotation axis 17 of the electromagnetic actuator 10 is made.

Further, through-holes 15a and 15b, which are holes into which the upper portion (part of the upper cover 15 side) of the coil 13 wound around the stator 12, are formed in the end 15f of the upper cover 15, is formed. It is. The through holes 15a and 15b are formed at positions facing the bearing hole 15e. The through holes 15a and 15b do not contact the upper part of the coil 13 (part of the upper cover 15 side) to accommodate the upper part of the coil 13 (part of the upper cover 15 side). It is formed in a minimum size to the extent that it does not. Moreover, the perimeter of the through-holes 15a and 15b is formed in the shape of a taper in conformity with the curved surface of the upper part (part of the upper cover 15 side) of the coil 13 wound up. By this, miniaturization of the direction of the rotation axis 17 of the electromagnetic actuator 10 is made. In addition, the upper cover 15 is provided with a plurality of recesses 15c that engage with the convex portions 14c of the lower cover 14.

The circuit board 16 is a circuit board which relays the wiring for supplying electric power to the coil 13, and the circuit 16a is provided in the surface. In the circuit 16a, lands connected to the coil 13 and lands for conducting with other printed boards are formed. Lands for connecting the coils 13 and lands for conducting with other printed circuit boards are connected on the surface of the circuit 16a. When power is supplied from another printed board, the coils 13 pass through lands that conduct with the other boards. Energize As shown in FIG. 3, the circuit board 16 is adhered by an adhesive constituting the pressure-sensitive adhesive layer 20 described later above the end portion 15f of the upper cover 15 (the side opposite to the rotor 11 side). The circuit 16a may be provided with other circuit components.

The circuit board 16 is disposed above the end 15f of the upper cover 15 to block the through holes 15a and 15b. By arranging the circuit board 16 to cover the through holes 15a and 15b, it is possible to prevent foreign substances such as garbage and dust from entering through the through holes 15a and 15b. In addition, since the circuit board 16 is formed in a U shape (armband) and is disposed at the end portion 15f to avoid the support portion 15d of the upper cover 15, the outer surface side of the support portion 15d as shown in FIG. 3. The circuit board 16 is accommodated in the inner side (the rotor 11 side) from the surface of the rotor 11 side (the opposite side to the rotor 11 side). This arrangement of the circuit board 16 also reduces the axial direction of the rotating shaft 17 of the entire electromagnetic actuator 10.

The adhesive layer 20 is a layer comprised from an adhesive. The pressure-sensitive adhesive adheres foreign matter such as garbage or dust, which penetrates through a gap between the through holes 14a and 14b, the lower cover 14 and the upper cover 15. If foreign matter penetrates between the rotor 11 and the stator 12, the rotational accuracy of the rotor 11 is lowered, so that rotational failure may occur. The adhesive layer 20 adheres such foreign matters to the adhesive face to prevent foreign matters from invading the dangerous part. The adhesive layer 20 is formed by apply | coating an adhesive over all the surfaces of the back surface (surface adhere | attached with the upper cover 15 side) of the circuit board 16. FIG. That is, the pressure-sensitive adhesive layer 20 is provided at the portion where the bonding portion between the circuit board 16 and the upper cover 15 and the through holes 14a and 14b are blocked. In addition, the circuit board 16 is adhere | attached with the upper cover 15 by the said adhesive. The pressure sensitive adhesive also serves as an adhesive for bonding the circuit board 16 to the upper cover 15. As the pressure-sensitive adhesive, for example, a thermosetting acrylic pressure-sensitive adhesive may be used. The adhesive layer 20 exposes the adhesive surface to the inner surface side (rotor 11 side) of the upper cover 15 through the through holes 15a and 15b of the upper cover 15.

To assemble the electromagnetic actuator 10, insert the tip of one end of the rotary shaft 17 of the rotor 11 into the bearing hole 14e of the lower cover 14, and the top of the other end of the rotary shaft 17 of the rotor 11. It is inserted into the bearing hole 15e of the cover 15. At the same time, the convex portion 14d of the lower cover 14 is coupled to the recessed portion 12f of the stator 12 on which the coil 13 is wound so that the rotor 11 and the stator 12 are connected to the lower cover 14. And the upper cover 15.

Then, the convex portion 14c of the lower cover 14 is inserted into the concave portion 15c of the upper cover 15 to which the circuit board 16 is adhered by the adhesive of the pressure sensitive adhesive layer 20, thereby bonding or caulking. Secure the lower cover 14 and the upper cover 15. In addition, the electromagnetic actuator 10 can be easily assembled by connecting the coil 13 to the land of the circuit 16a.

The electromagnetic actuator 10 applies the positive current or the negative current to the coils 13a and 13b to magnetize the extremes 12a to 12c of the stator 12. As a result, a suction or repulsion force is generated between the extreme values 12a to 12c and the magnetic poles of the rotor 11 to generate a rotational torque in the rotor 11 to rotate the rotor 11.

A driving device of a sector using the electromagnetic actuator 10 will be described with reference to FIG. 3. The drive device 40 of the sector may be used for the shutter of the camera. The sector drive device 40 is equipped with an electromagnetic actuator 10 having a drive lever 30 and a pair of sectors 31 (31a, 31b).

The drive lever 30 is a transmission unit for transmitting the driving force of the rotor 11 to the sector 31. The drive lever 30 is fixed to the rotation shaft 17. The drive lever 30 rotates about the rotation shaft 17 in accordance with the rotation of the rotor 11. The pair of sectors 31 opens and closes the shutter opening (not shown) even when driven by the drive lever 30. The pair of sectors 31 is composed of a first sector 31a and a second sector 31b. The drive lever 30 is connected to the drive lever holes 311a and 311b of the first sector 31a and the second sector 31b.

In the drive device 40 of the sector 31, for example, when the rotor 11 is rotated in the counterclockwise rotation in FIG. 3, the first sector 31a is counterclockwise through the drive lever 30. At the same time as the rotation, the second sector 31b rotates clockwise through the drive lever 30. That is, as the counterclockwise rotation of the first sector 31a is rotated, the locking pin is fitted into the locking pin cutout of the second sector 31b to rotate the second sector 31b in the clockwise direction. In this way, the shutter passage is closed by rotating in the direction in which the first sector 31a and the second sector 31b approach each other.

When the rotor 11 is rotated in the clockwise direction, the first sector 31a rotates in the clockwise direction through the drive lever 30 and the second sector 31b is halved through the drive lever 30. Rotate clockwise. That is, with the clockwise rotation of the first sector 31a, the locking pin is fitted into the locking pin cutout of the second sector 31b to rotate the second sector 31b counterclockwise. In this way, the shutter passage is opened by the first sector 31a and the second sector 31b rotating in a direction away from each other. In this way, the sector drive device 40 drives the first sector 31a and the second sector 31b.

Here, a control circuit for controlling the electromagnetic actuator 10 with respect to the sector drive device 40 will be described with reference to FIG. 5. The control part 50 is equipped with the CPU (Central Processing Unit) 51, the memory 52, and the driver 53, as shown in FIG. The CPU 51 performs control and arithmetic processing of the entire electromagnetic actuator 10. The memory 52 stores a program or control information for controlling the electromagnetic actuator 10. The driver 53 excites the coils 13a and 13b by flowing a positive or negative driving current in the form of a pulse in response to a control signal from the CPU 51. The operation button 54 is connected to the CPU 51.

When the operation button 54 is pressed, the CPU 51 instructs the driver 53 of the output of the positive current or the negative current in order to drive the electromagnetic actuator 10. The driver 53 causes a positive current or a negative current to flow through the coils 13a and 13b of the electromagnetic actuator 10 according to the instruction. The rotor 11 then rotates clockwise or counterclockwise, and the first sector 31a and the second sector 31b rotate in opposite directions to open and close the shutter. In this way, the CPU 51 drives the shutter.

In the electromagnetic actuator 10 of the present embodiment, the coils 13a and 13b are wound directly on the coil winding portions 12d and 12e of the stator 12 without using coil bobbins. In addition, since the surface on the side where the circuit board 16 is provided on the coil winding portions 12d and 12e is formed lower than the surroundings, the end portion 15f of the upper cover 15 is the lower cover 14 in the rotor shaft direction. Approached to the side. In addition, the through holes 14a and 14b of the lower cover 14 and the through holes 15a and 15b of the upper cover 15 have a lower portion (part of the lower cover 14 side) and an upper portion of the coils 13a and 13b. The part (part of the upper cover 15 side) is accommodated. Moreover, the U-shaped circuit board 16 is arrange | positioned at the edge part 15f, avoiding the support part 15d. Furthermore, a recess is formed in the inner surface (surface opposite to the rotor 11) of the support portion 15d of the upper cover 15, and a part of the rotor 11 (circuit board 16 side) is accommodated. By such a structure, the electromagnetic actuator 10 of this embodiment realizes miniaturization of the axial direction of the rotating shaft 17. As shown in FIG.

Moreover, in the electromagnetic actuator 10 of this embodiment, the adhesive layer 20 comprised from the adhesive used to adhere | attach the upper cover 15 to the back surface (surface which contacts the upper cover 15 side) of the circuit board 16 is carried out. ) May be provided. In addition, the adhesive surface of the pressure-sensitive adhesive layer 20 is to adhere foreign substances coming from the through hole (14a, 14b) of the lower cover 14 or the gap between the lower cover 14 and the upper cover 15. Therefore, it is possible to reduce or prevent foreign matter from entering the space of the rotor 11 and the stator 12, for example, without requiring an extra thickness. Therefore, the occurrence of rotation failure can be prevented by maintaining the rotation accuracy of the rotor 11.

In addition, since the drive device 40 of the present embodiment is provided with the above-described electromagnetic actuator, the drive device 40 can be miniaturized and can be driven with high accuracy without causing a malfunction.

As mentioned above, although this invention was described based on embodiment, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, in the present embodiment, an example of a three-pole stator 12 in which two coils 13a and 13b are wound has been described, but the present invention can also be applied to a two-pole stator in which one coil is wound. have. In this case, the number of through holes formed in the lower cover 14 and the upper cover 15 may be one.

The present invention can also be applied to electromagnetic actuators having a plurality of two-pole stators wound around one coil. In this case, through holes corresponding to the number of coils wound around each stator are formed in the lower cover 14 and the upper cover 15, respectively.

In addition, the number of coils wound around one stator may be three or more, and through holes corresponding to the number of coils are formed in the lower cover 14 and the upper cover 15, respectively.

In addition, in this embodiment, the example provided with the recessed part which a part of rotor 11 enters in the inner surface (surface facing the rotor 11) of the support part 15d of the upper cover 15 was demonstrated. However, it is not necessary for the supporting portion 15d to have a recessed portion.

In addition, in this embodiment, the example using the circuit board 16 formed in U shape was demonstrated. However, since it is only necessary to avoid the support part 15d and to cover the through holes 15a and 15b, it is not necessary to form the U shape.

In addition, in this embodiment, the example in which the circuit board 16 enters inside (the rotor 11 side) rather than the outer surface (surface on the opposite side to the rotor 11 side) of the support part 15d was demonstrated. However, it is not necessary for the whole circuit board 16 to necessarily enter, and a part of circuit board 16 may be outward rather than the outer surface of the support part 15d.

In addition, in this embodiment, the example which forms the periphery of the through-hole 14a, 14b, 15a, 15b in taper form was demonstrated. However, for example, when the shape in which the coil 13 is wound is not a curved surface, it is not necessary to form it in a taper form.

In addition, in this embodiment, although the example which formed the bearing hole 15e of the rotating shaft 17 which protruded toward the circuit board 16 side of the upper cover 15 was demonstrated, in the support part 15d of the upper cover 15, A through hole may be formed as a bearing hole for supporting the rotating shaft 17.

In addition, in this embodiment, although the adhesive layer 20 was provided in the surface which the circuit board 16 and the upper cover 15 contact, it is not necessary to necessarily provide the adhesive layer 20, and the circuit board 16 is upper side. What is necessary is just a structure which can be fixed to the cover 15. Also in this case, since the through holes 15a and 15b are blocked by the circuit board 16, foreign matter can be prevented from entering the electromagnetic actuator 10 to some extent.

Furthermore, in this embodiment, the adhesive layer 20 was provided over all the surfaces of the surface where the circuit board 16 and the upper cover 15 meet. However, the pressure-sensitive adhesive layer 20 may be provided only at the bonding portion between the circuit board 16 and the upper cover 15, and the pressure-sensitive adhesive layer if the circuit board 16 covers a part of the through holes 14a and 14b. 20 may be partially provided on the back surface of the circuit board 16.

In addition, in this embodiment, the example in which the electromagnetic actuator 10 is a stepping motor was demonstrated. However, the present invention is not limited to the stepping motor, but can be applied to, for example, a rocking motor provided with an angle determining member and limited in a range within which the rotation is possible.

In addition, in this embodiment, the example which uses the electromagnetic actuator 10 for the shutter drive apparatus of a camera was demonstrated. However, the present invention is not limited to the present embodiment, and may be used, for example, in an aperture device of a camera, a vibration generator of a mobile phone, or the like, or may be used in a copy machine, a facsimile machine, a printer, or the like.

The embodiment disclosed this time is only an example and is not restrictive. It is intended that the scope of the invention include all modifications that come within the meaning and range of equivalency and the scope of the claims as indicated by the claims rather than the foregoing description.

This application is based on the JP Patent application 2005-293997 for which it applied on October 6, 2005, and Japanese Patent application 2005-303448 for which it applied on October 18, 2005. In this specification, it is contained with reference to the specification of JP Patent application 2005-29597 and JP 2005-303448, a claim, and the whole drawing.

According to the present invention, it is possible to provide an electromagnetic actuator having a smaller size, higher rotational accuracy, and less rotational failure, and a drive device having the same.

Claims (9)

A rotor that rotates about an axis of rotation, A stator opposing the rotor, Coil wound around the stator, An upper cover having a support portion for supporting the rotational axis of the rotor on an inner surface facing the rotor and an end portion formed around the support portion, the end portion being more concave than the outer surface of the support portion, and A circuit board disposed at an end of the upper cover and having a circuit connected to the coil; Electromagnetic actuator comprising a. The method of claim 1, The inner surface of the support portion is concave than the inner surface of the end portion, the electromagnetic actuator, characterized in that a portion of the rotor enters. The method of claim 1, The hole into which a part of the said coil enters is formed in the edge part of the said upper cover, The electromagnetic actuator characterized by the above-mentioned. The method of claim 3, And the circuit board is arranged to close the hole. The method of claim 1, The winding part of the stator in which the coil is wound, An electromagnetic actuator, wherein the surface of the side on which the electric circuit board is disposed is formed lower than the surroundings. The method of claim 1, And a lower cover on an opposite side of the upper cover as viewed from the stator, wherein the lower cover has a support for supporting the rotating shaft and a hole into which a part of the coil enters. A rotor that rotates about an axis of rotation, A stator opposing the rotor, Coil wound around the stator, An upper cover which fixes the stator and supports the rotational shaft and has a hole through which a part of the coil enters; A pressure-sensitive adhesive layer is disposed between the at least part of the portion facing the hole and the adhesive portion, and the adhesive portion is bonded to the upper cover by the pressure-sensitive adhesive of the pressure-sensitive adhesive layer, and connected to the coil. Circuit board with isolated circuit Electromagnetic actuator comprising a. The method of claim 7, wherein The pressure-sensitive adhesive layer is provided over all the surfaces in contact with the circuit board and the upper cover, the electromagnetic actuator. The method of claim 7, wherein The material of the pressure-sensitive adhesive layer is an electromagnetic actuator, characterized in that the thermosetting acrylic pressure-sensitive adhesive.

Images