Linear vibration motor

• US 8,188,623 B2
• Filed: 03/05/2010
• Issued: 05/29/2012
• Est. Priority Date: 07/01/2009
• Status: Expired due to Fees

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Park, Seok Jun, Choi, Jun Kun, Jun, Jae Woo, Oh, Hwa Young, Bang, Je Hyun, Lee, Kwang Hyung, Lee, Kyung Ho, Kim, Yong Jin
• Primary Examiner(s): Leung, Quyen
• Assistant Examiner(s): Mok, Alex W
• Application Number:
  US12/718,466
• Publication Number:
  US 20110001365A1
• Time in Patent Office: 816 Days
• Field of Search: 310/15, 310/17, 310/51, 310/89, 310/12.01, 310/12.31
• US Class Current: 310/15
• CPC Class Codes: H02K 33/16 with polarised armatures moving in alternate directions by reversal or energisation of a single coil system
• CPC Class Codes: H02K 7/08 Structural association with bearings

Abstract

Disclosed herein is a linear vibration motor. The motor includes a casing surrounding the top and widthwise side of the motor, and a bracket surrounding the bottom and lengthwise side of the motor. A plate is provided on an inner surface of a side of the bracket and integrally has a cylindrical part to accommodate a coil. A mass body is provided in a central portion of the bracket and vibrates horizontally, a yoke is provided on a side surface of the mass body, and a magnet is mounted to a central portion of the yoke to be inserted into an internal space of the coil. A spring couples the plate with the yoke, thus transmitting vibratory force to the motor. An extension part extends from an end of the spring, and a bearing is provided on an end of the extension part, thus minimizing friction with the casing.

Claims

1. A linear vibration motor, comprising:

a casing surrounding a top and a widthwise side of the motor, and a bracket surrounding a bottom and a lengthwise side of the motor;

a plate provided on an inner surface of a side of the bracket and integrally having a cylindrical part to accommodate a coil therein;

a mass body provided in a central portion of the bracket and vibrating in a horizontal direction, a yoke provided on a side surface of the mass body, and a magnet mounted to a central portion of the yoke to be inserted into an internal space of the coil;

a spring coupling the plate with the yoke, thus transmitting vibratory force to the motor; and

an extension part extending from an end of the spring, and a bearing provided on an end of the extension part, thus minimizing friction with the casing.

2. The linear vibration motor as set forth in claim 1, wherein the bearing comprises a ball bearing having a shape of a ball.

3. The linear vibration motor as set forth in claim 1, wherein the bearing comprises a cylinder bearing having a shape of a cylinder.

4. The linear vibration motor as set forth in claim 1, wherein the bearing comprises a ring bearing having a shape of a ring.

5. The linear vibration motor as set forth in claim 1, wherein the casing comprises a stepped rail to guide the bearing.

6. The linear vibration motor as set forth in claim 1, wherein the yoke comprises:

a protruding part extending from an edge of the yoke; and

a ball provided on an end of the protruding part to minimize a frictional surface between the mass body and the casing when the mass body is in operation.

7. The linear vibration motor as set forth in claim 6, wherein the casing comprises a stepped rail to guide the ball of the protruding part.