Actuator, coil and adhesive layer

An actuator includes a movable body having a magnet, a support body having a coil, and a power feeding board with which two lead-out wires extended from a winding part of the coil are connected. The coil includes a first air core coil and a second air core coil. The first air core coil has a first winding part, a first inner side lead-out wire, and a first outer side lead-out wire. The second air core coil has a second winding part whose winding direction is the same as the first winding part and which is overlapped with the first winding part, a second inner side lead-out wire which is extended from the second winding part and whose tip end portion is electrically connected with a tip end portion of the first inner side lead-out wire, and a second outer side lead-out wire extended from the second winding part.

CROSS REFERENCE TO RELATED APPLICATION

The present invention claims priority under 35 U.S.C. § 119 to Japanese Application No. 2021-063219 filed Apr. 2, 2021, the entire content of which is incorporated herein by reference.

TECHNICAL FIELD

At least an embodiment of the present invention may relate to an actuator structured to move a movable body by a magnetic drive mechanism including a magnet and a coil. Further, at least an embodiment of the present invention may relate to a coil which is used in the magnetic drive mechanism.

BACKGROUND

As a device for notifying information by vibration, an actuator has been proposed which is structured to vibrate a movable body supported in a support body by a magnetic drive mechanism. An actuator disclosed in Japanese Patent Laid-Open No. 2020-102902 (Patent Literature 1) includes a movable body, a support body, a connection body which relatively movably connects the movable body with the support body, and a magnetic drive mechanism structured to relatively move the movable body and the support body. The movable body includes a magnet. The support body includes a coil, a coil holder which holds the coil, and a power feeding circuit board which is fixed to the coil holder. The magnet and the coil face each other in a thickness direction of a winding part of the coil to structure the magnetic drive mechanism. A center hole of the winding part opens in a facing direction in which the magnet and the coil face each other. A coil wire which is extended from the winding part is connected with the power feeding circuit board which is disposed on an outer side in a radial direction of the winding part.

A coil is commonly manufactured so that a coil wire is wound around in a height direction on an outer peripheral side of a jig for determining a shape of a center hole. Therefore, when the coil has been completed, a winding start portion of the coil wire is located on an inner peripheral side of the winding part, and a winding end portion is located on an outer peripheral side of the winding part. Therefore, when a coil is to be connected with a power feeding circuit board, the winding end portion is capable of connecting with the power feeding circuit board by extending as it is. However, the winding start portion is required to be extended from an inner peripheral side of the winding part to its outer peripheral side along a surface of the winding part and then, connected with the power feeding circuit board.

In a magnetic drive mechanism, when a gap space between the winding part of the coil and a magnet is set to be narrow, thrust for relatively moving a support body and a movable body can be increased. However, in a case that the winding start portion of the coil wire is extended along a surface of the winding part for connecting the coil with the power feeding circuit board, a gap space between the surface of the winding part and the magnet becomes large by an amount of the winding start portion of the coil wire.

SUMMARY

At least an embodiment of the present invention may advantageously provide an actuator including a coil which is not required to extend a coil wire along a surface of a winding part for leading out an end part of the coil wire to an outer peripheral side with respect to the winding part. Further, at least an embodiment of the present invention may advantageously provide a coil which is not required to extend an end part of a coil wire along a surface of a winding part for leading out the end part of the coil wire to an outer peripheral side with respect to the winding part.

According to at least an embodiment of the present invention, there may be provided an actuator including a movable body having a magnet, a support body having a coil, a coil holder which holds the coil, and a power feeding board with which two lead-out wires extended from a winding part of the coil are connected on an outer peripheral side with respect to the coil, a connection body which relatively movably connects the movable body with the support body, and a magnetic drive mechanism having the magnet and the coil to relatively move the movable body and the support body. The magnet faces the coil in a thickness direction of the winding part. The coil includes a first air core coil having a first winding part, a first inner side lead-out wire extended from the first winding part to an inner peripheral side, and a first outer side lead-out wire extended from the first winding part to an outer side, and a second air core coil having a second winding part whose winding direction is the same as the first winding part and which is overlapped with the first winding part, a second inner side lead-out wire which is extended from the second winding part to an inner peripheral side and whose tip end portion is electrically connected with a tip end portion of the first inner side lead-out wire, and a second outer side lead-out wire extended from the second winding part to an outer side. The winding part includes the first winding part and the second winding part, and the first outer side lead-out wire and the second outer side lead-out wire are the two lead-out wires.

According to at least an embodiment of the present invention, the coil includes the first air core coil and the second air core coil. The first winding part of the first air core coil and the second winding part of the second coil are overlapped with each other in a state that their winding directions are the same as each other to structure the winding part of the coil. Further, a tip end portion of the first inner side lead-out wire extended from the first winding part of the first air core coil to an inner peripheral side and a tip end portion of the second inner side lead-out wire extended from the second winding part of the second air core coil to an inner peripheral side are electrically connected with each other. As a result, the coil includes, as the two lead-out wires, the first outer side lead-out wire extended from the first winding part to an outer peripheral side and the second outer side lead-out wire extended from the second winding part to an outer peripheral side. Therefore, when two coil wires extended from the winding part are to be connected with a power feeding board located on an outer peripheral side with respect to the winding part, the coil wire is not required to extend along a surface of the winding part. Accordingly, the surface of the winding part and the magnet can be easily approached each other and thus, large thrust relatively moving the movable body and the support body is easily obtained by a magnetic drive mechanism structured of the coil and the magnet. Further, the surface of the winding part and the magnet can be easily approached each other and thus, a size of the device in a thickness direction of the coil where the coil and the magnet face each other can be reduced. In addition, the first air core coil and the second air core coil are structured so that a tip end portion of the first inner side lead-out wire extended from the first winding part to an inner peripheral side and a tip end portion of the second inner side lead-out wire extended from the second winding part to an inner peripheral side are electrically connected with each other. As a result, a length dimension of the first inner side lead-out wire and a length dimension of the second inner side lead-out wire can be sufficiently secured and thus, the first inner side lead-out wire and the second inner side lead-out wire are easily electrically connected with each other.

In at least an embodiment of the present invention, it may be structured that the actuator includes an adhesive layer having a filling part which is filled in an inner side of the first air core coil and in an inside of the second air core coil, and a coil adhesion part which exists between the first air core coil and the second air core coil to adhesively bond the first air core coil to the second air core coil, and the first inner side lead-out wire and the second inner side lead-out wire are sealed in an inside of the filling part. According to this structure, the first air core coil and the second air core coil are fixed and integrated with each other by the adhesive layer. Further, the first inner side lead-out wire and the second inner side lead-out wire whose tip end portions are connected with each other are sealed in the inside of the adhesive layer. Therefore, even when the movable body and the support body are relatively moved to generate vibration, the first inner side lead-out wire and the second inner side lead-out wire are prevented from going out from the center hole of the winding part of the coil.

In at least an embodiment of the present invention, it may be structured that the adhesive layer includes a winding part fixing part which exists between the winding part and the coil holder to fix the coil to the coil holder. According to this structure, sealing of the first inner side lead-out wire and the second inner side lead-out wire in the inside of the adhesive layer, fixing of the first air core coil and the second air core coil, and fixing of the winding part of the coil to the coil holder can be performed by the adhesive layer.

In at least an embodiment of the present invention, it may be structured that the first air core coil and the second air core coil are the same air core coil. According to this structure, a number of components of the air core coil structuring the coil can be reduced.

In at least an embodiment of the present invention, it may be structured that the power feeding board includes a first power feeding board and a second power feeding board which is disposed on an opposite side to the first power feeding board with respect to the winding part, and the first outer side lead-out wire is connected with the first power feeding board, and the second outer side lead-out wire is connected with the second power feeding board. In other words, when the first air core coil and the second air core coil are respectively turned around the center hole, two lead-out wires extended from the coil can be extended in different directions. Therefore, the first power feeding board and the second power feeding board which are disposed on both sides of the winding part of the coil are easily connected with the respective lead-out wires.

Further, according to at least an embodiment of the present invention, there may be provided a coil including a winding part and two lead-out wires extended from the winding part. The coil includes a first air core coil having a first winding part, a first inner side lead-out wire extended from the first winding part to an inner peripheral side, and a first outer side lead-out wire extended from the first winding part to an outer side, and a second air core coil having a second winding part whose winding direction is the same as the first winding part and which is overlapped with a thickness direction of the first winding part, a second inner side lead-out wire which is extended from the second winding part to an inner peripheral side and whose tip end portion is electrically connected with a tip end portion of the first inner side lead-out wire, and a second outer side lead-out wire extended from the second winding part to an outer side, and an adhesive layer which exists between the first air core coil and the second air core coil to adhesively bond the first air core coil to the second air core coil. The winding part includes the first winding part and the second winding part, and the first outer side lead-out wire and the second outer side lead-out wire are the two lead-out wires.

The coil in accordance with at least an embodiment of the present invention includes, as the two lead-out wires, the first outer side lead-out wire and the second outer side lead-out wire which are extended from the winding part to an outer peripheral side. Therefore, when two coil wires extended from the winding part are to be connected with a power feeding board located on an outer peripheral side with respect to the winding part, the coil wire is not required to extend along a surface of the winding part.

In at least an embodiment of the present invention, it may be structured that the adhesive layer includes a filling part which is filled in an inner side of the first air core coil and in an inner side of the second air core coil, and the first inner side lead-out wire and the second inner side lead-out wire are sealed in an inside of the filling part. According to this structure, the first air core coil and the second air core coil are fixed and integrated with each other by the adhesive layer. Further, the first inner side lead-out wire and the second inner side lead-out wire whose tip end portions are connected with each other are sealed in the inside of the adhesive layer.

Effects of the Invention

In the actuator in at least an embodiment of the present invention, when end parts of two coil wires are to be connected with a power feeding board located on an outer peripheral side, the coil wire is not required to extend along a surface of the winding part. As a result, the surface of the winding part and the magnet can be easily approached each other and thus, large thrust relatively moving the movable body and the support body is easily obtained by a magnetic drive mechanism structured of the coil and the magnet. Further, the surface of the winding part and the magnet can be easily approached each other and thus, a size of the device in a thickness direction of the coil where the coil and the magnet face each other can be reduced.

According to the coil in at least an embodiment of the present invention, when end parts of two coil wires are to be extended to an outer peripheral side with respect to the winding part, the coil wire is not required to extend along a surface of the winding part. Further, the first air core coil and the second air core coil which structure the coil are provided with lead-out wires extended from the respective winding parts to an inner peripheral side, and tip end portions of the respective lead-out wires are electrically connected with each other. Therefore, a length dimension of the first inner side lead-out wire and a length dimension of the second inner side lead-out wire can be sufficiently secured and thus, the first inner side lead-out wire and the second inner side lead-out wire are easily electrically connected with each other.

DETAILED DESCRIPTION

FIG.1is a perspective view showing an actuator to which the present invention is applied.FIG.2is a cross-sectional view showing an actuator which is cut in a longitudinal direction.FIG.3is an exploded perspective view showing an actuator.FIG.4is an exploded perspective view showing an actuator in which a case is detached.

An actuator1in this embodiment is used as a tactile device for transmitting information by vibration. As shown inFIG.1, the actuator1is provided with an outward appearance in a rectangular prism shape. The actuator1generates vibration in a shorter direction in the outward appearance. In the following descriptions, a shorter direction in which vibration is generated is referred to as an “X” direction, and a longitudinal direction of the actuator1which is a direction perpendicular to the “X” direction is referred to as a “Y” direction. Further, in the following descriptions, a thickness direction of the actuator1which is a direction perpendicular to the “X” direction and the “Y” direction is referred to as a “Z” direction. Further, one side in the “X” direction is referred to as an “X1” direction side and the other side is referred to as an “X2” direction side. One side in the “Y” direction is referred to as a “Y1” direction side and the other side is referred to as a “Y2” direction side. One side in the “Z” direction is referred to as a “Z1” direction side and the other side is referred to as a “Z2” direction side.

As shown inFIG.2, the actuator1includes a support body3having a case2which forms an outer shape, and a movable body5which is accommodated in an inside of the case2. Further, the actuator1includes connection bodies6and7which connect the support body3with the movable body5relatively movably in the “X” direction, and a magnetic drive mechanism8structured to relatively move the movable body5and support body3in the “X” direction.

The support body3includes a coil10, a coil holder11which holds the coil10, a first plate12overlapped with the coil holder11on the “Z1” direction side, and a second plate13overlapped with the coil holder11on the “Z2” direction side. A thickness direction of the coil10is directed in the “Z” direction. The coil10is located at a center in the “Z” direction in an inside of the case2. Further, the support body3includes a power feeding circuit board14(power feeding board) which is held by an end face on the “Y1” direction side of the coil holder11. Electric power is supplied to the coil10through the power feeding circuit board14.

The movable body5includes a magnet16and a yoke17. The magnet16faces the coil10of the support body3in the “Z” direction. The coil10and the magnet16structure the magnetic drive mechanism8. The connection body6and the connection body7are respectively members in a rectangular prism shape. Each of the connection body6and the connection body7is provided with at least one of elasticity and viscoelasticity.

As shown inFIGS.2and4, the movable body5includes a first magnet21and a second magnet22as the magnet16. The first magnet21is located on the “Z1” direction side with respect to the coil10. The second magnet22is located on the “Z2” direction side with respect to the coil10. Each of the first magnet21and the second magnet22is polarized into two portions in the “X” direction. A magnetized polarizing line of the first magnet21is extended in the “Y” direction at a center in the “X” direction. A magnetized polarizing line of the second magnet22is extended in the “Y” direction at a center in the “X” direction.

The yoke17is made of magnetic material. The yoke17is structured by assembling two members, i.e., a first yoke23and a second yoke24. The first yoke23is provided with a first plate part25in a flat plate shape which is long in the “Y” direction, and a pair of connection plate parts26which are curved to the “Z2” direction side from a center portion in the “Y” direction toward an outer side in the “X” direction and extended to the “Z2” direction side at both end edges in the “Y” direction of the first plate part25. The first magnet21is held by a face on the “Z2” direction side of the first plate part25. The second yoke24is provided with a second plate part27which faces the first plate part25in the “Z” direction, and a pair of projecting parts28which are projected to the “X1” direction side and to the other “X2” direction side from an intermediate portion in the “Y” direction of the second plate part27. The second magnet22is held by a face on the “Z1” direction side of the second plate part27. A pair of the projecting parts28of the second yoke24are joined to tip end portions on the “Z2” direction side of a pair of the connection plate parts26by a method such as welding. As a result, the first yoke23and the second yoke24are integrated with each other as one body to structure the yoke17.

FIG.5is an exploded perspective view showing the support body3in which a case is detached.FIG.6is an exploded perspective view showing the support body3in which a case is detached and which is viewed from an opposite side toFIG.5.FIG.5is a view showing the support body3which is viewed from the “Z2” direction side, andFIG.6is a view showing the support body3which is viewed from the “Z1” direction side.FIG.7is an explanatory view showing a fixing method of the coil10to the coil holder11.

As shown inFIGS.1and2, the case2includes a first case member31and a second case member32which are overlapped with each other in the “Z” direction. The first case member31is attached to the coil holder11from the “Z1” direction side. The second case member32is attached to the coil holder11from the “Z2” direction side. As shown inFIG.3, the first case member31is provided with a first plate part33in a rectangular shape, and a pair of side plate parts34which are extended to the “Z2” direction side from both end edges in the “X” direction of the first plate part33. A pair of the side plate parts34are located on both sides in the “X” direction of the coil holder11. The second case member32is provided with a second plate part35in a rectangular shape and a pair of side plate parts36which are extended to the “Z1” direction side from both end edges in the “X” direction of the second plate part35. A pair of the side plate parts36are located on both sides in the “X” direction of the coil holder11.

As shown inFIGS.5and6, a contour shape of the coil holder11when viewed in the “Z” direction is a rectangular shape which is long in the “Y” direction. The coil holder11is provided with a plate part40which is extended in the “Y” direction at a center in the “X” direction. A coil arrangement hole41is provided at a center of the plate part40. The coil arrangement hole41is a through hole in an elliptical shape which is long in the “Y” direction. Further, the coil holder11is provided with cut-out parts42and43which are formed by cutting out a center portion in the “Y” direction of the plate part40to an inner side.

Further, the coil holder11is provided, on the “Y1” direction side with respect to the cut-out parts42and43, with a side plate part44, which is protruded to the “Z1” direction side and to the “Z2” direction side from an edge on the “X1” direction side of the plate part40, and a side plate part45which is protruded to the “Z1” direction side and to the “Z2” direction side from an edge on the “X2” direction side of the plate part40. An opposing face of the side plate part44to the side plate part45is provided with a plurality of groove parts44awhich are extended to the “Z1” direction side and to the “Z2” direction side from the plate part40. Further, an opposing face of the side plate part45to the side plate part44is provided with a plurality of groove parts45awhich are extended to the “Z1” direction side and to the “Z2” direction side from the plate part40. In addition, the coil holder11is provided with a side plate part46which is protruded to the “Z1” direction side from an end edge on the “Y1” direction side of the plate part40and connects an end on the “Y1” direction side of the side plate part44with an end on the “Y1” direction side of the side plate part45.

Further, the coil holder11is provided, on the “Y2” direction side with respect to the cut-out parts42and43, with a side plate part47, which is protruded to the “Z1” direction side and to the “Z2” direction side from an edge on the “X1” direction side of the plate part40, and a side plate part48which is protruded to the “Z1” direction side and to the “Z2” direction side from an edge on the “X2” direction side of the plate part40. In addition, the coil holder11is provided with a side plate part49which is protruded to the “Z1” direction side and to the “Z2” direction side from an end edge on the “Y2” direction side of the plate part40and connects an end on the “Y2” direction side of the side plate part47with an end on the “Y2” direction side of the side plate part48. An opposing face of the side plate part47to the side plate part48is provided with a plurality of groove parts47awhich are extended to the “Z1” direction side and to the “Z2” direction side from the plate part40. Further, an opposing face of the side plate part48to the side plate part47is provided with a plurality of groove parts48awhich are extended to the “Z1” direction side and to the “Z2” direction side from the plate part40.

Further, the coil holder11is, as shown inFIG.5, provided with a pair of slits51and52at end parts on the “Y1” direction side of the side plate parts44and45facing each other in the “X” direction. Each of a pair of the slits51and52is extended in the “Z” direction. An end on the “Z2” direction side of each of a pair of the slits51and52is opened. In addition, the coil holder11is provided with two guide grooves53, which are extended in parallel with each other from the coil arrangement hole41to the “Y1” direction side, on a face on the “Z2” direction side of the plate part40.

In this embodiment, the coil10is provided with a winding part55which is formed by winding a coil wire in an elliptical shape, and a first outer side lead-out wire56and a second outer side lead-out wire57which are extended to the “Y1” direction side from an outer peripheral side of the winding part55. The winding part55is provided with two effective side portions55a, which are extended in the “Y” direction and are arranged in parallel with each other in the “X” direction, and two curved side portions55bin a circular arc shape each of which connects both ends in the “Y” direction of the two effective side portions55awith each other. The winding part55is accommodated in the coil arrangement hole41. Each of the first outer side lead-out wire56and the second outer side lead-out wire57is routed in an inside of each of the guide grooves53from the coil arrangement hole41. The coil10is fixed to the coil holder11by an adhesive layer59shown inFIG.2. As the details will be described later, as shown inFIGS.2,5and6, the coil10is provided with a first air core coil71and a second air core coil72which are overlapped with each other in the “Z” direction.

As shown inFIGS.4and5, the power feeding circuit board14is held by the coil holder11by utilizing a pair of the slits51and52provided at an end on the “Y1” direction side of the coil holder11. In other words, end edges on both sides in the “X” direction of the power feeding circuit board14are respectively fitted into the slits51and52from the “Z2” direction side. As a result, the power feeding circuit board14is supported by an opening edge of an opening part of the coil holder11which is surrounded by the side plate part44, the side plate part45and the side plate part46on the “Y1” direction side. The power feeding circuit board14is supported so that its board surface formed with a wiring pattern15faces toward the “Y1” direction side. The power feeding circuit board14is fixed to the coil holder11by an adhesive.

In this embodiment, as shown inFIG.7, the first outer side lead-out wire56extended from the winding part55of the coil10to the “Y1” direction side along the guide groove53is bent to the “Z2” direction side and is electrically connected with the power feeding circuit board14. Further, the second outer side lead-out wire57extended from the winding part55of the coil10to the “Y1” direction side along the guide groove53is bent to the “Z2” direction side and is electrically connected with the power feeding circuit board14.

As shown inFIGS.5and6, the first plate12is provided with a first plate part61in a rectangular shape which covers the plate part40from the “Z1” direction side, and a plurality of first claw parts62which are obliquely protruded to the “Z1” direction side and toward an outer side in the “X” direction from both sides in the “X” direction of the first plate part61. The first claw parts62are respectively inserted into a groove part44aprovided in the side plate part44, a groove part45aprovided in the side plate part45, a groove part47aprovided in the side plate part47, and a groove part48aprovided in the side plate part48from the “Z2” direction side. When the first plate12is contacted with the plate part40of the coil holder11from the “Z1” direction side, the first claw parts62are set in a state that they are elastically abutted with the side plate part44, the side plate part45, the side plate part47and the side plate part48.

Further, the second plate13is provided with a second plate part63in a rectangular shape which covers the plate part40from the “Z2” direction side, and a plurality of second claw parts64which are obliquely protruded to the “Z2” direction side and toward an outer side in the “X” direction from both sides in the “X” direction of the second plate part63. The second claw parts64are respectively inserted into a groove part44aprovided in the side plate part44, a groove part45aprovided in the side plate part45, a groove part47aprovided in the side plate part47, and a groove part48aprovided in the side plate part48. When the second plate13is contacted with the plate part40of the coil holder11from the “Z2” direction side, the second claw parts64are set in a state that they are elastically abutted with the side plate part44, the side plate part45, the side plate part47and the side plate part48.

(Fixing of Coil to Coil Holder)

Next, a fixing method of the coil to the coil holder will be described below. As shown inFIG.7, when the support body3is to be manufactured, the first plate12is overlapped with the plate part40of the coil holder11from the “Z1” direction side. Then, the first claw parts62of the first plate12are respectively inserted into the groove parts44a,45a,47aand48aprovided in the side plate parts44,45,47and48. As a result, the first plate12is supported by the coil holder11in a state that the first plate12closes the coil arrangement hole41from the “Z1” direction side.

Next, the winding part55of the coil10is disposed in the coil arrangement hole41. Then, an adhesive58is filled in a center hole10aof the winding part55. After that, the second plate13is overlapped with the plate part40of the coil holder11from the “Z2” direction side, and the second claw parts64of the second plate13are respectively inserted into the groove parts44a,45a,47aand48aprovided in the side plate parts44,45,47and48. As a result, the second plate13is supported by the coil holder11.

In this embodiment, the adhesive58filled in the center hole10aof the winding part55enters between the winding part55and the first plate12on the “Z1” direction side of the winding part55to flow into a gap space between the first plate12and the plate part40of the coil holder11and reaches between the winding part55and an inner wall face of the coil arrangement hole41. Further, the adhesive58enters between the winding part55and the second plate13on the “Z2” direction side of the winding part55to flow into a gap space between the second plate13and the plate part40of the coil holder11and reaches between the winding part55and the inner wall face of the coil arrangement hole41.

Therefore, when the adhesive58is cured, as shown inFIG.2, the winding part55is fixed to the inner wall face of the coil arrangement hole41in the plate part40of the coil holder11by the adhesive layer59which is a cured adhesive58. Further, the first plate12is fixed to the plate part40of the coil holder11by the adhesive layer59. In addition, the second plate13is fixed to the plate part40of the coil holder11by the adhesive layer59. In other words, the adhesive layer59which is the cured adhesive58is provided with a filling part59ain which the adhesive58is filled in the center hole10aof the winding part55, a winding part fixing part59bwhich fixes the winding part55to the plate part40of the coil holder11, a first plate fixing part59cwhich fixes the first plate12to the plate part40of the coil holder11, and a second plate fixing part59dwhich fixes the second plate13to the plate part40of the coil holder11.

As shown inFIGS.2and4, each of the connection bodies6and7is formed in a rectangular prism shape which is extended long in the “X” direction. The connection body6is disposed between the first yoke23and the first plate12. More specifically, the connection body6is structured of two members and is sandwiched at two positions, i.e., between end portions on the “Y1” direction side of the first yoke23and the first plate12, and between end portions on the “Y2” direction side of the first yoke23and the first plate12. The connection body7is disposed between the second yoke24and the second plate13. More specifically, the connection body7is structured of two members and is sandwiched at two positions, i.e., between an end portion on the “Y1” direction side of the second yoke24and an end portion on the “Y1” direction side of the second plate13, and between an end portion on the “Y2” direction side of the second yoke24and an end portion on the “Y2” direction side of the second plate13. The connection bodies6and7are gel members made of silicone gel. Each of the connection body6and the connection body7is set in a compressed state in the “Z” direction between the support body3and the movable body5.

In this embodiment, in a state that the movable body5is supported by the support body3through the connection bodies6and7, the coil10is disposed between the first magnet21and the second magnet22in the “Z” direction. When this state is viewed in the “Z” direction, the effective side portions55aof the winding part55face the first magnet21on the “Z1” direction side and face the second magnet22on the “Z2” direction side. Further, both end portions in the “Y” direction of the first plate part25of the first yoke23and the second plate part27of the second yoke24are disposed between the side plate part44and the side plate part45and between the side plate part47and the side plate part48of the coil holder11in the “X” direction. In addition, a pair of the connection plate parts26of the yoke17are located in the cut-out part43between the side plate part44and the side plate part47in the “Y” direction and in the cut-out part44between the side plate part45and the side plate part48. The side plate part44, the side plate part45, the side plate part47and the side plate part48of the coil holder11function as abutting parts which restrict a movable range when the movable body5is moved in the “X” direction.

Wiring lines from a device on which the actuator1is mounted are connected with the wiring patterns15of the power feeding circuit board14. In this embodiment, when an electric current is supplied to the coil10in a predetermined direction through the power feeding circuit board14, the movable body5supported by the support body3is moved to one side in the “X” direction. After that, when a direction of the electric current is reversed, the movable body5is moved to the other side in the “X” direction. When a direction of the electric current supplied to the coil10is repeatedly reversed, the movable body5is vibrated.

Next, detail of the coil10will be described below with reference toFIGS.8and9.FIG.8is a cross-sectional view showing the coil10which is cut in the “X” direction.FIG.9is an exploded perspective view showing the coil10.

The coil10is, as shown inFIG.5, provided with the winding part55which is structured by winding a coil wire in an elliptical shape, and two lead-out wires (first outer side lead-out wire56and second outer side lead-out wire57) which are extended from the winding part55to the “Y1” direction side. The winding part55is accommodated in the coil arrangement hole41provided in the plate part40of the coil holder11and is fixed to the coil holder11by the adhesive layer59. The first outer side lead-out wire56and the second outer side lead-out wire57are connected with the power feeding circuit board14which is located on an outer peripheral side with respect to the winding part55.

In this embodiment, the coil10includes the first air core coil71and the second air core coil72. As shown inFIG.9, the first air core coil71is provided with a first winding part71a, a first inner side lead-out wire71bwhich is extended to an inner peripheral side from the first winding part71a, and a first outer side lead-out wire71cwhich is extended to an outer side from the first winding part71a. The second air core coil72is provided with a second winding part72a, a second inner side lead-out wire72bwhich is extended to an inner peripheral side from the second winding part72a, and a second outer side lead-out wire72cwhich is extended to an outer side from the second winding part72a.

The second winding part72aof the second air core coil72is overlapped with the first winding part71ain the “Z” direction in a state that its winding direction is the same as the first winding part71a. A tip end portion of the second inner side lead-out wire72bwhich is extended to an inner peripheral side from the second winding part72ais electrically connected with a tip end portion of the first inner side lead-out wire71bwhich is extended to an inner peripheral side from the first winding part71aof the first air core coil71. The tip end portion of the second inner side lead-out wire72band the tip end portion of the first inner side lead-out wire71bare connected with each other by soldering or thermal caulking. As a result, the coil10is provided with the first winding part71aof the first air core coil71and the second winding part72aof the second air core coil72as the winding part55. Further, the coil10is provided with the first outer side lead-out wire71cand the second outer side lead-out wire72cwhich are extended to the “Y1” direction side from the winding part55as two lead-out wires (first outer side lead-out wire56and second outer side lead-out wire57of a coil wire) which are extended from the winding part55.

In this embodiment, as shown inFIG.7, when the support body3of the actuator1is to be structured, the adhesive58is filled in the center hole10aof the winding part55of the coil10. The adhesive58which is filled in the center hole10aof the winding part55of the coil10covers the first inner side lead-out wire71bof the first air core coil71and the second inner side lead-out wire72bof the second air core coil72whose tip end portions are connected with each other as shown by the chain line inFIG.7. Further, the adhesive58filled in the center hole10aof the winding part55of the coil10flows into a gap space between the first plate12and the plate part40of the coil holder11, a gap space between the winding part55and the inner wall face of the coil arrangement hole41, and a gap space between the second plate13and the plate part40of the coil holder11and, in addition, a gap space between the first air core coil71and the second air core coil72.

Therefore, when the adhesive58is cured, as shown inFIG.2, the adhesive layer59structured of the cured adhesive58is provided with the filling part59awhich is filled in the center hole10aof the coil10, the winding part fixing part59bwhich fixes the winding part55to the plate part40of the coil holder11, the first plate fixing part59cwhich fixes the first plate12to the plate part40of the coil holder11, the second plate fixing part59dwhich fixes the second plate13to the plate part40of the coil holder11, and a coil adhesion part59ewhich adhesively bonds the first air core coil71to the second air core coil72. In other words, the coil10is, as shown inFIG.8, provided with the filling part59afilled in the center hole10aof the coil10and the coil adhesion part59ewhich adhesively bonds the first air core coil71and the second air core coil72to each other. Further, the first inner side lead-out wire71bof the first air core coil71and the second inner side lead-out wire72bof the second air core coil72are sealed in the inside of the filling part59ain a state that they are electrically connected with each other.

FIG.10is an explanatory view showing a manufacturing method of a commonly used coil. Commonly, a winding part101of a coil100is structured by winding a coil wire in a height direction and to an outer peripheral side around a jig105which determines a shape of its opening part. Therefore, as shown inFIG.10, when the coil100is completed, a winding start portion103of the coil wire is located on an inner peripheral side of the winding part101and a winding end portion104is located on an outer peripheral side of the winding part101. Accordingly, when the coil100is to be connected with a power feeding circuit board which is located on an outer peripheral side with respect to the coil100, the winding end portion104can be extended as it is and connected with the power feeding circuit board. However, the winding start portion103is required to be extended from an inner peripheral side to an outer peripheral side along a surface101aof the winding part101. As a result, the winding start portion103is provided with a crossing portion103awhich is placed on and along the surface101aof the winding part101from an inner peripheral side to an outer peripheral side.

In the magnetic drive mechanism8, when a gap space between the winding part101of the coil100and the magnet16is set to be narrow, thrust for relatively moving the support body3and the movable body5can be increased. However, in a case that the winding start portion103of the coil wire is placed on and along the surface101aof the winding part101of the coil100, a gap space between the surface101aof the winding part101and the magnet16is required to be separated from each other by an amount of the winding start portion103(crossing portion103a).

On the other hand, in the coil10in this embodiment, as shown inFIGS.5and9, both of the two wires, i.e., the first outer side lead-out wire56and the second outer side lead-out wire57(first outer side lead-out wire71cand second outer side lead-out wire72c) extended from the winding part55are extended from an outer peripheral side of the winding part55. Therefore, two coil wires extended from the winding part55are to be connected with the power feeding circuit board14(power feeding board) which is located on an outer peripheral side with respect to the winding part55, the coil wire is not required to extend along the surface of the winding part55. Accordingly, in the magnetic drive mechanism8, in comparison with a case that the conventional coil100is used, a gap space between the winding part55and the magnet16can be narrowed. As a result, thrust for relatively moving the support body3and the movable body5can be increased.

Further, the surface of the winding part55and the magnet16can be easily come close to each other and thus, a size of the actuator1can be reduced in a thickness direction of the coil10where the coil10and the magnet16face each other.

In addition, in this embodiment, the first air core coil71and the second air core coil72are structured so that a tip end portion of the first inner side lead-out wire71bextended to an inner peripheral side from the first winding part71aand a tip end portion of the second inner side lead-out wire72bextended to an inner peripheral side from the second winding part72aare electrically connected with each other. In other words, the first air core coil71and the second air core coil72are provided with respective lead-out wires which are extended to an inner peripheral side from the respective winding parts55, and the tip end portions of the respective lead-out wires are electrically connected with each other. As a result, a length dimension of the first inner side lead-out wire71band a length dimension of the second inner side lead-out wire72bcan be sufficiently secured. Therefore, the first inner side lead-out wire71band the second inner side lead-out wire72bare electrically connected with each other easily.

In this embodiment, the coil10includes the adhesive layer59provided with the filling part59a, which is filled on an inner side of the first air core coil71and an inner side of the second air core coil72, and the coil adhesion part59ewhich exists between the first air core coil71and the second air core coil72to adhesively bond the first air core coil71and the second air core coil72to each other. The first inner side lead-out wire71band the second inner side lead-out wire72bare sealed in an inside of the filling part59a. Therefore, the first air core coil71and the second air core coil72are fixed and integrated with each other by the adhesive layer59. Further, the first inner side lead-out wire71band the second inner side lead-out wire72bwhose tip end portions are connected with each other are sealed in the inside of the adhesive layer59. Therefore, even when the movable body5and the support body3are relatively moved to generate vibration, the first inner side lead-out wire71band the second inner side lead-out wire72bare prevented from going out from the center hole10aof the winding part55of the coil10to interfere with the magnet16or the like.

Further, according to this embodiment, fixing of the winding part55of the coil10to the coil holder11, sealing of the first inner side lead-out wire71band the second inner side lead-out wire72bin the inside of the adhesive layer59, and fixing of the first air core coil71and the second air core coil72are performed by the adhesive layer59.

In addition, in this embodiment, the first air core coil71and the second air core coil72are the same air core coil10. Therefore, a number of components of the air core coil10structuring the coil10can be reduced.

Modified Embodiments

In this embodiment, the first air core coil71and the second air core coil72may be air core coils10having different shapes. For example, a winding number of the first air core coil71may be different from that of the second air core coil72.

Further, in the embodiment described above, two wires, i.e., the first outer side lead-out wire56and the second outer side lead-out wire57(first outer side lead-out wire71cand second outer side lead-out wire72c) extended from the winding part55are respectively extended to the “Y1” direction side. However, it may be structured that the first outer side lead-out wire56(first outer side lead-out wire71c) is extended from the winding part55to the “Y1” direction side and the second outer side lead-out wire57(second outer side lead-out wire72c) is extended to the “Y2” direction side.

In this case, the second air core coil72is overlapped with the first air core coil71in a state that the second air core coil72is turned by 180° in a winding direction around the center hole. Further, in this case, the power feeding circuit board14(power feeding board) includes a first power feeding board and a second power feeding board disposed on an opposite side to the first power feeding board with respect to the winding part55, and the first outer side lead-out wire71cis connected with the first power feeding board and the second outer side lead-out wire72cis connected with the second power feeding board.