Flat linear vibrator

• US 8,410,642 B2
• Filed: 05/06/2010
• Issued: 04/02/2013
• 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 N
• Application Number:
  US12/774,890
• Publication Number:
  US 20110115310A1
• Time in Patent Office: 1,062 Days
• Field of Search: 310/15, 310/17, 310 20- 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 vibrating unit suspended in the housing by the elastic members, and a coil positioned in the housing. The base has a bottom wall and a plurality of sidewalls extending vertically from the bottom wall. The vibrating unit has a magnet assembly and vibrates along a direction parallel to the bottom wall. The base further has a block located on the bottom wall. The block is located on a vibration path of the weight contacting the weight during vibration. An effective elastic displacement of the elastic member is not smaller than a distance between the block and a part contacting the block of the weight.

Claims

1. A linear vibrator, comprising:

a cover;

a base forming a housing together with the cover, the base defining a bottom wall and a plurality of sidewalls;

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;

a magnet assembly accommodated in the through hole of the weight, 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 coil positioned on the bottom wall and located below the magnet, wherein

the base further defines a block located on the bottom wall, and the block is located on a vibration path of the weight for contacting the weight during vibration, and an effective elastic displacement of the elastic member is not smaller than a distance between the block and a part of the weight contacting the block of the weight while the weight is still.

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 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.

4. The linear vibrator as described in claim 3, wherein the weight defines a positioning portion at least partially received in the slot and sandwiched between the upper part and the lower part.

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

6. A linear vibrator, comprising:

a housing including a cover and a base, the base defining a bottom wall and a plurality of sidewalls vertically extending from 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 vibrating unit suspended by the elastic members, the vibrating unit comprising a magnet assembly, 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 coil positioned on the bottom wall and located below the magnet, wherein

the base further defines a block located on the bottom wall, and the block is located on a vibration path of the weight for contacting the weight during vibration, and an effective elastic displacement of the elastic member is not smaller than a distance between the block and a part of the weight contacting the block of the weight while the weight is still.

7. The linear vibrator as described in claim 6, 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.

8. The linear vibrator as described in claim 7, 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.

9. The linear vibrator as described in claim 8, wherein the weight defines a positioning portion at least partially received in the slot and sandwiched between the upper part and the lower part.

10. The linear vibrator as described in claim 6 further comprising a weight which is made from materials having densities higher than 7.8 g/cm³.

11. A linear vibrator, comprising:

a housing including a base and a cover, the base having a bottom wall and a plurality of sidewalls extending vertically from the bottom wall;

a plurality of elastic members connected to the housing;

a vibrating unit suspended in the housing by the elastic members, the vibrating unit having a magnet assembly and vibrating along a direction parallel to the bottom wall;

a coil positioned on the bottom wall and facing the magnet assembly, wherein

the base further defines a block located on the bottom wall, and the block is located on a vibration path of the vibrating unit for contacting the vibrating unit during vibration, and an effective elastic displacement of the elastic member is not smaller than a distance between the block and a part of the vibrating unit contacting the block of the weight while the vibrating unit is still.

12. The linear vibrator as described in claim 11 further comprising a weight surrounding the magnet assembly, the weight being made from materials having densities higher than 7.8 g/cm³.