Linear vibrator

• US 8,269,379 B2
• Filed: 05/06/2010
• Issued: 09/18/2012
• Est. Priority Date: 11/16/2009
• Status: Active Grant

• Current Assignee: AAC Technologies Pte Limited (AAC Technologies Holdings Inc.)
• Original Assignee: AAC Acoustic Technologies Company Limited, American Audio Components, Inc.
• Inventors: Dong, Le-Ping, Xu, Hong-Fu
• Primary Examiner(s): Nguyen, Tran
• Application Number:
  US12/774,925
• Publication Number:
  US 20110115311A1
• Time in Patent Office: 866 Days
• Field of Search: 310/15, 310/17, 310/20, 310 25- 30, 310/81, 381/396, 381/400, 381/401, 381/404, 381/406, 381/412, 340/388.1
• US Class Current: 310/25
• CPC Class Codes: H02K 33/16 with polarised armatures moving in alternate directions by reversal or energisation of a single coil system

Abstract

A linear vibrator is disclosed. The linear vibrator includes a housing having a base and a cover, a number of elastic members connected to the housing, a moving unit suspended inside the housing by the elastic members, a PCB covered by the housing and a coil mounted on the PCB. The base has a bottom wall, a plurality of sidewalls extending vertically from the bottom wall and a blocking ring extending form a central portion of the bottom wall. The moving unit has a magnet assembly and at least a pair of patches and vibrates along a direction parallel to the bottom wall, the coil is located right below the magnet assembly.

Claims

1. A linear vibrator, comprising:

a cover;

a base forming a housing together with the cover, the base defining a bottom wall, a plurality of sidewalls extending vertically from the bottom wall, and a blocking ring extending form a central portion of the bottom wall;

a plurality of elastic members received in the housing, each of the elastic members including a fastening portion connecting to the housing, an elastic arm extending from the fastening portion, and a mounting portion extending from the elastic arm, the elastic arm being deformable parallel to the bottom wall;

a weight suspended in the housing by the elastic members and defining a through hole therein, the weight further defining at least a pair of patches;

a magnet assembly accommodated in the through hole of the weight, a half part of the magnet assembly having magnetic poles opposite to those of the other half, and planes of magnetic poles of the magnet assembly being parallel and facing to the bottom wall of the base; and

a printed circuit board covered by the housing for carrying a coil thereon, the coil being located below the magnet assembly, wherein

the blocking ring is located on the vibration path during vibration of the combination of the weight and the magnet assembly for being capable of withstanding the patches for protecting the elastic members from plastic deformation.

2. The linear vibrator as described in claim 1, wherein the fastening portion of the elastic member includes a first fastening part connecting to one sidewall of the base and a second fastening part connecting to another adjacent sidewall.

3. The linear vibrator as described in claim 2, wherein the fastening portion of the elastic member further includes a third fastening part extending vertically from the second fastening part and paralleling to mounted on the bottom wall.

4. The linear vibrator as described in claim 1, wherein the mounting portion of the elastic member includes an upper part, a lower part opposed from the upper part, and a slot between the upper part and the lower part.

5. The linear vibrator as described in claim 4, wherein the weight defines a positioning portion at least partially received in the slot and sandwiched between the upper part and the lower part.

6. The linear vibrator as described in claim 1, wherein the weight is made from materials having densities higher than 7.8 g/cm3.

7. The linear vibrator as described in claim 1, wherein the magnet assembly has a first magnet part and a second magnet part separately positioned in a through hole of the weight.

8. A linear vibrator, comprising:

a housing including a cover and a base, the base defining a bottom wall, a plurality of sidewalls vertically extending from the bottom wall, and a blocking ring extending form a central portion of the bottom wall;

a plurality of elastic members connected to the housing, each of the elastic members including an elastic arm being deformable parallel to the bottom wall;

a moving unit suspended by the elastic members, the moving unit comprising a magnet assembly and at least a pair of patches, one half of the magnet assembly having magnetic poles opposite to those of the other half, and planes of magnetic poles of the magnet assembly being parallel and facing to the bottom wall of the base; and

a printed circuit board covered by the housing and a coil mounted on the PCB, the coil located below the magnet assembly, wherein

the blocking ring is located on the vibration path during vibration of the moving unit for being capable of withstanding the patches for protecting the elastic members from plastic deformation.

9. The linear vibrator as described in claim 8, wherein the elastic member further including a fastening portion having a first fastening part connecting to one sidewall of the base and a second fastening part connecting to another adjacent sidewall.

10. The linear vibrator as described in claim 9, wherein the elastic member further defines a mounting portion extending from the elastic arm, the mounting portion including an upper part, a lower part opposed from the upper part, and a slot between the upper part and the lower part.

11. The linear vibrator as described in claim 10, wherein the moving unit defines a positioning portion at least partially received in the slot and sandwiched between the upper part and the lower part.

12. The linear vibrator as described in claim 8, wherein the moving unit further comprises a weight accommodating the magnet assembly, the weight being made from materials having densities higher than 7.8 g/cm3.

13. A linear vibrator, comprising:

a housing including a base and a cover, the base having a bottom wall, a plurality of sidewalls extending vertically from the bottom wall, and a blocking ring extending form a central portion of the bottom wall;

a plurality of elastic members connected to the housing;

a moving unit suspended in the housing by the elastic members, the moving unit having a magnet assembly and at least a pair of patches, the moving unit vibrating along a direction parallel to the bottom wall;

a printed circuit board covered by the housing and a coil mounted on the PCB, the coil located below the magnet assembly, wherein

the blocking ring is located on the vibration path during vibration of the moving unit for being capable of withstanding the patches for protecting the elastic members from plastic deformation.

14. The linear vibrator as described in claim 13, wherein the moving unit further comprises a weight surrounding the magnet assembly, the weight being made from materials having densities higher than 7.8 g/cm3.