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US 2018/0006542 A1Published application
Vibration actuator
AssigneeJahwa Electronics Co., Ltd.
InventorsNAM JIN CHOI, KYUNG HOON JO, SOON KOO SHIM, YOUNG BIN CHONG, WON GOOK LEE, MIN GOO LEE
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Abstract
A vibration actuator includes a bracket coupled to a case to form an inner space; a stator having a circuit board coupled to an upper surface of the bracket, a coil connected to the circuit board, and a yoke provided in the coil; a vibrator having a permanent magnet disposed at an outer side of the coil and a weight coupled to an outer circumference of the permanent magnet; an elastic member configured to connect the stator and the vibrator and elastically support the vibrator; and a non-magnetic damper provided between the weight and the elastic member.
Claims17
1:
- A vibration actuator, comprising:
- a bracket coupled to a case to form an inner space;
- a stator having a circuit board coupled to an upper surface of the bracket, a coil connected to the circuit board, a yoke provided in the coil, and a wing portion located on an upper portion of the coil;
- a vibrator having a permanent magnet disposed at an outer side of the coil and a weight coupled to an outer circumference of the permanent magnet;
- and
- an elastic member configured to connect the stator and the vibrator and elastically support the vibrator;
- wherein a ratio of a thickness of the wing portion of the yoke to a thickness of the permanent magnet is 0.05 to 0.7.
4 more elements
2:
- The vibration actuator according to claim 1, further comprising:
- a plate interposed between the vibrator and the elastic member.
3:
- The vibration actuator according to claim 1, further comprising:
- a non-magnetic damper provided between the weight and the elastic member,
- wherein the non-magnetic damper is made of liquid grease.
4:
- The vibration actuator according to claim 1, further comprising:
- a magnetic fluid applied on an upper surface of the permanent magnet.
(canceled)
(canceled)
7:
- The vibration actuator according to claim 1, wherein a ratio of a diameter of the wing portion to an inner diameter of the permanent magnet is 0.4 to 0.99.
8:
- The vibration actuator according to claim 1, wherein the permanent magnet is a neodymium magnet plated with a non-magnetic metal.
9:
- The vibration actuator according to claim 8, wherein the neodymium magnet plated with the non-magnetic metal expands an effective vibration frequency bandwidth by at least 30% on the basis of 1 G of the vibration actuator in comparison to a nickel-plated neodymium magnet.
10:
- The vibration actuator according to claim 9, wherein the vibration actuator including the non-magnetic metal-plated neodymium magnet has an effective vibration frequency bandwidth of 52 to 56 Hz.
11:
- A vibration actuator, comprising:
- a bracket coupled to a case to form an inner space;
- a stator having a circuit board coupled to an upper surface of the bracket, a coil connected to the circuit board, a yoke provided in the coil, and a wing portion located on an upper portion of the coil;
- a vibrator having a permanent magnet disposed at an outer side of the coil and a weight coupled to an outer circumference of the permanent magnet;
- and
- an elastic member configured to connect the stator and the vibrator and elastically support the vibrator,
- wherein a ratio of a diameter of the wing portion of the yoke to an inner diameter of the permanent magnet is 0.4 to 0.99.
4 more elements
12:
- The vibration actuator according to claim 11, further comprising:
- a non-magnetic damper provided between the weight and the elastic member.
13:
- The vibration actuator according to claim 11, wherein the permanent magnet is a neodymium magnet plated with a non-magnetic metal.
14:
- The vibration actuator according to claim 13, wherein the neodymium magnet plated with the non-magnetic metal expands an effective vibration frequency bandwidth by at least 30% on the basis of 1 G of the vibration actuator in comparison to a nickel-plated neodymium magnet.
15:
- The vibration actuator according to claim 14, wherein the vibration actuator including the non-magnetic metal-plated neodymium magnet has an effective vibration frequency bandwidth of 52 to 56 Hz.
16:
- The vibration actuator according to claim 1, further comprising:
- a first damper provided at the upper surface of the bracket and a second damper provided at a lower surface of an upper portion of the case.
17:
- The vibration actuator according to claim 1, wherein the ratio of a thickness of the wing portion of the yoke to the thickness of the permanent magnet is 0.25 to 0.5.
Dependencies are inferred from the claim text.