VOICE COIL SPEAKER

• US 20150326975A1
• Filed: 07/30/2013
• Published: 11/12/2015
• Est. Priority Date: 08/29/2012
• Status: Active Grant

• Current Assignee: Clarion Co., Ltd. (Faurecia SA)
• Original Assignee: Clarion Co., Ltd. (Faurecia SA)
• Inventors: TAKADA, Naoki
• Granted Patent: US 9,319,796 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04R 1/06 Arranging circuit leads; Relieving strain on circuit leads
• CPC Class Codes: H04R 2209/022 Aspects regarding the stray flux internal or external to the magnetic circuit, e.g. shielding, shape of magnetic circuit, flux compensation coils
• CPC Class Codes: H04R 2499/13 Acoustic transducers and sound field adaptation in vehicles
• CPC Class Codes: H04R 3/00 Circuits for transducers , loudspeakers or microphones
• CPC Class Codes: H04R 31/006 Interconnection of transducer parts of diaphragm and outer suspension by moulding H04R31/003
• CPC Class Codes: H04R 9/02 Details
• CPC Class Codes: H04R 9/04 Construction, mounting, or centering of coil
• CPC Class Codes: H04R 9/046 Construction
• CPC Class Codes: H04R 9/06 Loudspeakers

Abstract

A voice speaker in which a signal line is properly designed to suppress deterioration of sound quality is provided.

A voice coil speaker 1 has a diaphragm 24 and a bobbin 21a which is connected to the diaphragm 24 and has a voice coil 22 formed thereon. The bobbin 21a has a bobbin main portion 65 having the voice coil 22 wound therearound, and an extension portion 67 which extends from the bobbin main portion 65 and in which a signal line conducted to the voice coil 22 is formed. The bobbin main portion 65 and the extension portion 67 are integrally formed of a flexible print board, and a site at which the extension portion 67 extends is covered by a shield case 34.

Claims

1. A voice coil speaker comprising:

a diaphragm; and

a bobbin that is connected to the diaphragm and has a voice coil formed thereon, wherein the bobbin has a bobbin main portion around which the voice coil is wound, and an extension portion that extends from the bobbin main portion and in which a signal line conducted to the voice coil is formed, the bobbin main portion and the extension portion are integrally formed of a flexible print board, and a site at which the extension portion extends is covered by a shield case.

2. The voice coil speaker according to claim 1, wherein the shield case is equipped at a back side of a yoke, a cut-out portion is formed in the yoke, and the extension portion is configured to pass through the cut-out portion and extend into the shield case at the back side of the yoke.

3. The voice coil speaker according to claim 2, wherein the yoke has a yoke bottom portion and a yoke protrusion portion protruding from the yoke bottom portion into the bobbin, a side surface cut-out portion is formed at a site corresponding to the extension portion on a side surface of the yoke protrusion portion, a bottom surface cut-out portion intercommunicating with the side surface cut-out portion is formed in the yoke bottom portion, and the extension portion extending from the bobbin main portion is configured to pass through the side surface cut-out portion and the bottom surface cut-out portion and extend into the shield case at the back side of the yoke.

4. The voice coil speaker according to claim 3, wherein the side surface cut-out portion is formed at a site on the side surface of the yoke protrusion portion where the side surface cut-out portion avoids to face the voice coil.

5. The voice coil speaker according to claim 2, wherein a circuit board for processing audio signals is disposed in the shield case equipped at the back side of the yoke, and a tip of the extension portion is connected to the circuit board.

6. The voice coil speaker according to claim 5, wherein a digital driver circuit is mounted on the circuit board.

7. The voice coil speaker according to claim 1, wherein a plurality of extension portions are equipped, and the plurality of extension portions are located to be symmetrical with one another with respect to a center axis of the bobbin.

8. The voice coil speaker according to claim 1, wherein the plurality of extension portions are equipped at equal intervals in a peripheral direction of the bobbin.

9. The voice coil speaker according to claim 1, wherein no shield member is attached to a site of the extension portion that is covered by the shield case.