Linear vibration motor having elastic pieces provided with vibration arms

Patent metadata

Field	Value
Publication number	US-11025146-B2
Application number	US-201616307619-A
Country	US
Kind code	B2
Filing date	Dec 29, 2016
Priority date	Jun 6, 2016
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

A linear vibration motor having elastic pieces provided with vibration arms comprises housing, a mass block, and elastic pieces. The elastic pieces connect the mass block and the housing to provide an elastic force in Z axis direction such that the mass block performs a movement up and down. The elastic pieces are provided with two vibration arms, and the two vibration arms are symmetrical about the X axis when rotating 180 degrees around the X axis. The elastic pieces are S-shaped or inverted Z-shaped, or formed by the combination of two V-shaped vibration arms. The elastic pieces have two or four elastic pieces, and disposed on symmetrical two sides of the mass block.

First claim

The invention claimed is:

1. A linear vibration motor comprising a housing, a mass block, and elastic pieces connecting the mass block and the housing, wherein the elastic pieces have at least two elastic pieces which are respectively arranged on two symmetric sides of the mass block, the elastic pieces provide an elastic force in a Z axis direction, and the mass block moves up and down in the Z axis direction; and
wherein each side of the mass block is provided with a respective support plate, and a central portion of each of the support plate is provided with a notch penetrating through the support plate in an up-down direction; and
wherein each of the elastic pieces is provided with two vibration arms, an upper vibration arm and a lower vibration arm, the two vibration arms are 180 degrees symmetrical about a X axis, middle portions of the elastic pieces are fixed in the notch, and the two vibration arms of the elastic pieces are respectively located on an upper side and a lower side of the support plates.

2. The linear vibration motor of claim 1 , wherein the linear vibration motor further comprises a stopper which is locked into the notch, and middle portions of the elastic pieces and the stopper are welded and fixed in the notch.

3. The linear vibration motor of claim 2 , wherein the support plate(s) comprise two support plates, and the two support plates are disposed on two symmetrical sides of the mass block respectively, and the elastic pieces comprise two elastic pieces corresponding to the support plates; or
the support plate(s) comprise four support plates, and the four support plates are arranged on four sides of the mass block respectively, and the elastic pieces comprise four elastic pieces corresponding to the support plates; and
the elastic pieces disposed on two symmetrical sides of the mass block are 180 degrees symmetrical about the Z axis.

4. The linear vibration motor according to claim 3 , wherein the elastic pieces are S-shaped elastic pieces,
the middle portions of the S-shaped elastic pieces are welded and fixed in the notches of the support plates, and each of the S-shaped elastic pieces are provided with the two vibration arms which are respectively located on the upper side and lower side of the support plate; and free ends of the two vibration arms are provided with welding planes, and the two vibration arms are fixed in inner sides of the housing by welding each of the welding planes respectively.

5. The linear vibration motor according to claim 4 , wherein lengths of the S-shaped elastic pieces are greater than lengths of the support plates.

6. The linear vibration motor according to claim 3 , wherein each of the elastic pieces comprises two V-shaped vibration arms and one connecting piece, and the V-shaped vibration arms are integrally formed with the connecting piece; the two V-shaped vibration arms are 180 degrees symmetrical about the X axis, and openings of the two V-shaped vibration arms are opposite to each other;
the connecting piece is fixed in the notch, and the two V-shaped vibration arms are respectively located on the upper side and the lower side of the support plates; and free ends of the two V-shaped vibration arms are provided with welding planes, and the two V-shaped vibration arms are fixed in inner sides of the housing by welding each of the welding planes respectively.

7. The linear vibration motor according to claim 6 , wherein lengths of the V-shaped vibration arms are no more than ½ of lengths of the support plates.

8. The linear vibration motor according to claim 3 , wherein the elastic pieces are anti-Z-shaped elastic pieces;
the middle portions of the anti-Z-shaped elastic pieces are welded and fixed in the notches of the support plates, and the anti-Z-shaped elastic pieces are provided with the two vibration arms which are respectively located on the upper side and lower side of the support plate; and free ends of the two vibration arms are provided with welding planes, and the two vibration arms are fixed in inner sides of the housing by welding each of the welding planes respectively.

9. The linear vibration motor according to claim 8 , wherein lengths of the anti-Z-shaped elastic pieces are no more than lengths of the support plates.

10. The linear vibration motor of claim 1 , wherein the elastic pieces are made of a single material or a composite material, or a material in which a composite layer is added at later stage of processing.

Assignees

• Goertek Inc

Inventors

• Shi Hua
• Sun Hongchao

Classifications

• H02K7/065

  Electromechanical oscillators; Vibrating magnetic drives · CPC title

• H02K33/18

  with coil systems moving upon intermittent or reversed energisation thereof by interaction with a fixed field system, e.g. permanent magnets · CPC title

• H02K33/02 Primary

  with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs · CPC title

• B06B1/045

  using vibrating magnet, armature or coil system · CPC title

• H02K33/00

  Motors with reciprocating, oscillating or vibrating magnet, armature or coil system (arrangements for handling mechanical energy structurally associated with motors H02K7/00, e.g. H02K7/06) · CPC title