Linear vibration device

• US 8,624,450 B2
• Filed: 07/25/2011
• Issued: 01/07/2014
• Est. Priority Date: 12/30/2010
• Status: Active Grant

• Current Assignee: AAC Technologies Pte Limited (AAC Technologies Holdings Inc.), American Audio Components, Inc.
• Original Assignee: AAC Acoustic Technologies Company Limited, American Audio Components, Inc.
• Inventors: Dong, Le-Ping, Xu, Hong-Fu, Zhou, Shi
• Primary Examiner(s): Kim, John K
• Assistant Examiner(s): Singh, Rohit
• Application Number:
  US13/190,445
• Publication Number:
  US 20120169151A1
• Time in Patent Office: 897 Days
• Field of Search: 310/15, 310/17, 310/20, 310/21, 310/27, 310/29, 310/32, 310/36, 310/25, 310/12.31, 310/12.27
• 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 vibration device is disclosed. The linear vibration device includes a housing, a plurality of elastic members received in the housing, each of the elastic member has a fastening portion connecting to the housing, an elastic arm extending from the fastening portion, and a mounting portion extending from the elastic arm, a moving unit suspended in the housing by the elastic members, a coil located below the moving unit, a supporting portion coupling to the elastic member, the supporting portion has a supporting plate covering at least a part of a top surface of the moving unit and a supporting arm extending downwardly from the supporting plate for pushing the mounting portion toward the positioning portion of the moving unit, the mounting portion has a fender defining a top part above the top surface of the moving unit for restricting the position of the supporting plate.

Claims

1. A linear vibration device, comprising:

a cover;

a crust forming a housing together with the cover, the crust defining a bottom wall and a plurality of sidewalls extending upwardly and perpendicularly from 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;

a moving unit suspended in the housing by the elastic members, the moving unit including an aperture in a middle portion thereof for receiving a magnet assembly and a plurality of positioning portions engaging with the mounting portions of the elastic members;

the magnet assembly accommodated in the aperture and defining a first magnet part and a second magnet part separately each other, the first magnet part having magnetic poles opposite to those of the second magnet part and planes of the magnetic poles of the magnet assembly being parallel and facing to the bottom wall of the crust;

a PCB at least partially covered by the bottom wall of the crust;

a coil mounted on the PCB and located below the magnet assembly;

a supporting portion coupling to the elastic member, the supporting portion defining a supporting plate covering at least a part of a top surface of the moving unit and a supporting arm extending downwardly from the supporting plate for pushing the mounting portion toward the positioning portion of the moving unit;

wherein

the mounting portion defines a main board and a fender extending parallelly from the two ends of the main board, the fender having a top part above the top surface of the moving unit for restricting the position of the supporting plate.

2. The linear vibration device as described in claim 1, wherein the elastic arm defines a first arm extending perpendicularly from the fastening portion and a second arm connected to the first arm by a U-shaped connecting portion.

3. The linear vibration device as described in claim 1, wherein a blocking ring extends perpendicularly from a bottom wall of the housing and forms a though hole, for receiving the annular coil.

4. The linear vibration device as described in claim 1, wherein the supporting portion further defines a supporting arm extending perpendicularly from the supporting plate, a supporting part extending perpendicularly from the supporting arm and substantially parallel to the supporting plate.

5. The linear vibration device as described in claim 1, wherein the moving unit defines a weight suspending in the housing by the elastic members, the aperture in a middle portion thereof for receiving the magnet assembly.

6. The linear vibration device as described in claim 5, wherein the first magnet part and the second magnet part separately positioned in the aperture of the weight.