Nidec Sankyo Corporation

Kabushiki Kaisha Sankyo Seiki Seisakusho

Hiroshi Kitahara

Tadashi Takeda

Masao Tsuchihashi

Akira Mori

Takeshi Sue

An actuator is provided. A movable body oscillating in an actuator has a shaft, and first and second inner frame members fixed to the shaft. A support body has a cylindrical case, a first and second lid members fixed to the ends of the case, and a first and second outer frame members disposed inside the case. The first inner frame member is connected to the first outer frame member by the first connecting body, and the second inner frame member is connected to the second outer frame member by the second connecting body. The first lid member has a pressing convex portion which abuts the first outer frame member, and the second lid member has a pressing convex portion which abuts the second outer frame member. The number of the pressing convex portions arranged spaced apart along the circumference direction is limited to two or three.

Actuator and lid with pressing convex portions

The actuator includes a movable body, a support body with a case that accommodates the movable body and a coil holder, a connecting body connected to the movable body and the support body, and a magnetic drive circuit including a coil and magnets opposed to the coil in a Z direction and causing the movable body to vibrate in an X direction with respect to the support body. The connecting bodyincludes the first connecting bodydisposed at the position where the movable bodyand the support bodyare opposed to each other in the Z direction (first direction), and the second connecting bodydisposed at the position where the movable bodyand the support bodyare opposed to each other in the X direction (second direction). The first connecting body and the second connecting body are viscoelastic bodies.

Actuator with first connecting body disposed in first direction and second connecting body disposed in second direction

An actuator comprising: a support body; a movable body which is movable with respect to the support body; and a drive mechanism structured to drive the movable body; wherein the drive mechanism comprises: a first magnetic drive circuit which comprises a first coil and a first magnet facing each other in a first direction and is structured to drive the movable body in a second direction perpendicular to the first direction; and a second magnetic drive circuit which comprises a second coil and a second magnet facing each other in the first direction at a position overlapping with the first magnetic drive circuit in the first direction, the second magnetic drive circuit being structured to drive the movable body in a third direction perpendicular to the first direction and intersecting the second direction.

Actuator with two magnetic drive circuits to vibrate a body in two directions

An actuator may include a movable body; a support body; a connecting body arranged where the movable body and the support body face each other to contact both of the movable body and the support body; and a magnetic drive circuit. The magnetic drive circuit may include an air-core coil provided on a first-side member among the movable body and the support body; and a permanent magnet provided on a second-side member among the movable body and the support body to face the coil in a first direction, the magnetic drive circuit being configured to vibrate the movable body with respect to the support body in a second direction crossing the first direction. In the first-side member, the coil may be fixed by an adhesive to a surface of a plate-shaped coil holder on a first side in the first direction while an air-cores is directed in the first direction.

Actuator

An actuator is provided. In order to reduce the planar area of an actuator, a first magnetic drive circuit and a third magnetic drive circuit that vibrate a movable body in an X direction with respect to a support are provided respectively on both sides, in a Z direction, of a second magnetic drive circuit that vibrates the movable body in a Y direction with respect to the support. The movable ranges, in the X direction and the Y direction, of the movable body with respect to the support are regulated by a stopper mechanism constituted between a first magnet and a first coil holder holding a first coil, a stopper mechanism constituted between a second magnet and a second coil holder holding a second coil, and a stopper mechanism constituted between a third magnet and a third coil holder holding a third coil.

Each of holders which holds a coil or a magnet used in a magnetic drive circuit, in a stacked manner in a first direction without causing rattling in an actuator (), a first coil holder () of a first magnetic drive circuit (), a second coil holder () of a second magnetic drive circuit (), and a third coil holder () of a third magnetic drive circuit () are arranged in a stacked manner in a Z direction, and the first coil holder, the second coil holder, and the third coil holder are fastened in the Z direction by a restraining member (). Thus, the first coil holder, the second coil holder, and the third coil holder can be arranged in a stacked manner in the Z direction without causing rattling. The restraining member is constituted by a first member () and a second member () having the same configuration, including size and shape.

In the actuator, the viscoelastic members are arranged at positions at which the support body and the movable body face each other in the first direction, and the magnetic drive circuit drives the movable body in the second direction which crosses the first direction. The viscoelastic members connect the movable body and the support body together while having the thickness direction thereof in the first direction and extending in the second direction. Therefore, resonance caused when the movable body is vibrated can be restricted. Reproducibility of vibration acceleration corresponding to the input signals can be improved by utilizing the spring elements of the viscoelastic members in the shearing direction, thus enabling the actuator to vibrate with delicate nuances. Further, the viscoelastic members can be prevented from being pressed in the thickness direction and greatly deformed, therefore, preventing the gap between the movable body and the support body from greatly varying.

Actuator having a viscoelastic member arranged for a moveable body

In a magnetic drive circuit of an actuator, a first yoke and a second yoke are disposed on both sides in a first direction across a coil, and a first magnet and a second magnet are fixed to the first yoke and the second yoke. The first yoke includes a first connecting plate part and a second connecting plate part that extend toward the second yoke. Thus, welding of the first connecting plate part and the second yoke and the second connecting plate part and the second yoke can be efficiently performed on a different side in the first direction (a side where the second yoke is located).

Actuator having a contacted part with increased strength for restricting a movable range of a movable body

In the actuator, the first end plate part of the first cover member in the support body is layered on one side in the first direction of the holder and faces the first yoke of the movable body from one side in the first direction. The second end plate part of the second cover member in the support body is layered on the other side in the first direction of the holder and faces the movable body from the other side in the first direction. Thus, the first viscoelastic member interposed between the movable body and the first end plate part in the first direction properly contacts with the movable body and the first end plate part. The second viscoelastic member interposed between the movable body and the second end plate part in the first direction properly contacts with the movable body and the second end plate part.

An actuator may include a movable body; a support body; a connecting body disposed in contact with both the movable body and the support body in a position in which the movable body and the support body face each other; and a magnetic driving circuit including a coil in the support body and a permanent magnet in the movable body. The magnetic driving circuit may cause the movable body to vibrate. The support body may include a coil holder that holds the coil, a case that covers a circumference of the movable body and the coil holder, and a power supply board held by the coil holder in a position exposed from the case and to which a coil wire forming the coil is connected.

An actuator may include a movable body; a support body; a connecting body; and a magnetic driving circuit. The magnetic driving circuit may include an air-core coil provided in a first member, and a first permanent magnet provided in a second member so as to face the coil on a first side in a first direction. The magnetic driving circuit may cause the movable body to vibrate with respect to the support body in a second direction which intersects with the first direction. The first member may include a coil holder comprising a plate part in which a coil placement hole is formed, a first plate that overlaps the coil placement hole and the plate part, and an adhesive layer. The coil may face the first permanent magnet via the first plate.

An actuator () is provided A substrate () held by a support () is provided with a total of six power supply electrodes () electrically connected respectively to both ends of a first coil () of a first magnetic drive circuit () that vibrates a movable body () in an X direction, both ends of a second coil () of a second magnetic drive circuit () that vibrates the movable body () in a Y direction, and both ends of a third coil () of a third magnetic drive circuit () that vibrates the movable body () in the X direction. An opening () that exposes the six power supply electrodes () is formed in a cover ().

An actuator is provided. In the actuator, a first magnetic drive circuit and a third magnetic drive circuit that vibrate a movable body in a second direction with respect to a support are provided respectively on both sides in a first direction. A second magnetic drive circuit that vibrates the movable body in a third direction with respect to the support is provided. The first magnetic drive circuit, the second magnetic drive circuit and the third magnetic drive circuit are arranged to be sequentially stacked from one side to the other side in the first direction.

An actuator may include a movable body; a support body; a connecting body disposed in contact with both the movable body and the support body; and a magnetic driving circuit including a coil provided in a first member, and a permanent magnet provided in a second member. The magnetic driving circuit may vibrate the movable body. The first member may include a coil holder and a power supply board. Both end portions of the power supply board may fit, from a second side in the first direction, inside of a pair of slits extending to a first side in the first direction. The power supply board may fit in the pair of slits to a depth in which the power supply board is in contact with a contact portion of the coil holder. The coil wire may be slackened in a section between the coil and a connecting position.

An actuator may include a supporting body; a movable body; a first magnetic drive circuit; a second magnetic drive circuit. The first magnetic drive circuit may include a first coil and a first magnet. The second magnetic drive circuit may include a second coil and a second magnet. The actuator may further include a first yoke on a side of the first coil remote from the second coil; a second yoke on a side of the second coil remote from the first coil; and a third yoke between the first coil and the second coil. The first magnet may be held on a face of the first yoke or a face of the third yoke. The second magnet may be held on a face of the second yoke or a face of the third yoke. The third yoke may be thicker than the first and second yoke.

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Nagano, Japan

Hiroshi Kitahara