SLIM TYPE SPEAKER AND MAGNETIC CIRCUIT THEREFOR

• US 20120308070A1
• Filed: 04/27/2012
• Published: 12/06/2012
• Est. Priority Date: 04/28/2011
• Status: Abandoned Application

• Current Assignee: BSE Company Limited (BSE Holdings Company Limited)
• Original Assignee: BSE Company Limited (BSE Holdings Company Limited)
• Inventors: LEE, Han Ryang, KIM, Kyu Dong
• Application Number:
  US13/458,392
• Publication Number:
  US 20120308070A1
• Time in Patent Office: Days
• US Class Current: 381/412
• CPC Class Codes: H04R 9/025 Magnetic circuit

Abstract

A magnetic circuit and a speaker including the magnetic circuit. The speaker includes: a bottom case; a magnetic circuit including a perpendicular-magnetized permanent magnet and a horizontal-magnetized permanent magnet spaced apart from each other by a predetermined interval; a diaphragm; a voice coil attached on a surface of the diaphragm, disposed in a magnetic gap between the perpendicular-magnetized permanent magnet and the horizontal-magnetized permanent magnet and which vibrates the diaphragm; and a front cover coupled to the bottom case to fix the magnetic circuit and the diaphragm. The magnetic circuit includes a perpendicular-magnetized permanent magnet and a plurality of horizontal-magnetized permanent magnets. The perpendicular-magnetized permanent magnet is disposed between the plurality of horizontal-magnetized permanent magnets such that the plurality of horizontal-magnetized permanent magnets support the diaphragm and interact with the perpendicular-magnetized permanent magnet to create a uniform magnetic field.

Claims

1. A magnetic circuit for a slim type speaker, comprising:

a perpendicular-magnetized permanent magnet;

a plate that is formed of a paramagnetic material and is attached to a surface of the perpendicular-magnetized permanent magnet; and

horizontal-magnetized permanent magnets that are arranged at opposite sides of the perpendicular-magnetized permanent magnet and are spaced apart from the perpendicular-magnetized permanent magnet by a predetermined interval,

wherein the perpendicular-magnetized permanent magnet and the horizontal-magnetized permanent magnets interact with each other to form a uniform magnetic field.

2. The magnetic circuit of claim 1, wherein a thickness of the horizontal-magnetized permanent magnet is greater than a thickness of the perpendicular-magnetized permanent magnet.

3. The magnetic circuit of claim 2, wherein the thickness of the horizontal-magnetized permanent magnet is equal to a total thickness of the perpendicular-magnetized permanent magnet and the plate.

4. The magnetic circuit of claim 1, wherein the perpendicular-magnetized permanent magnet has a bar shape and is disposed between the horizontal-magnetized permanent magnets, and

wherein the horizontal-magnetized permanent magnets each have a bar shape, are arranged at the opposite sides of the perpendicular-magnetized permanent magnet, and are spaced apart from the perpendicular-magnetized permanent magnet by the predetermined interval to form a magnetic gap.

5. A slim type speaker comprising:

a bottom case;

a magnetic circuit comprising a perpendicular-magnetized permanent magnet and a horizontal-magnetized permanent magnet which are spaced apart from each other by a predetermined interval on the bottom case, and a plate attached to a surface of the perpendicular-magnetized permanent magnet;

a diaphragm;

a voice coil that is attached on a lower surface of the diaphragm, is disposed in a magnetic gap between the perpendicular-magnetized permanent magnet and the horizontal-magnetized permanent magnet, and vibrates the diaphragm; and

a front cover that is coupled to the bottom case to closely fix the magnetic circuit and the diaphragm.

6. The slim type speaker of claim 5, wherein the magnetic circuit comprises a perpendicular-magnetized permanent magnet;

a plate that is formed of a paramagnetic material and is attached to a surface of the perpendicular-magnetized permanent magnet; and

a plurality of horizontal-magnetized permanent magnets each having a bar shape,

wherein the perpendicular-magnetized permanent magnet is disposed between the plurality of horizontal-magnetized permanent magnets that are disposed in parallel to each other such that the plurality of horizontal-magnetized permanent magnets support the diaphragm and interact with the perpendicular-magnetized permanent magnet to form a uniform magnetic field.

7. The slim type speaker of claim 5, wherein the voice coil is a wound type coil or a flexible printed circuit board (FPCB) type coil.