COMPOSITE SPEAKER

• US 20120263338A1
• Filed: 06/04/2010
• Published: 10/18/2012
• Est. Priority Date: 12/21/2009
• Status: Active Grant

• Current Assignee: FPS Inc.
• Original Assignee: C/O FPS Incorporated
• Inventors: Hori, Masashi, Kobayashi, Kuniyuki, Saotome, Hiromi, Iwata, Masahiro
• Granted Patent: US 8,548,190 B2
• Time in Patent Office: Days
• US Class Current: 381/398
• CPC Class Codes: H04R 3/02 for preventing acoustic reaction , i.e. acoustic oscillatory feedback specially adapted for hearing aids H04R25/453

Abstract

A composite speaker is provided capable of obtaining larger sound output than that of a conventional flat panel speaker and flat speaker when input with an audio signal of the same strength. The composite speaker includes: one magnet or a plurality of magnets disposed at predetermined intervals to each other; a yoke for forming a magnetic circuit with a magnetic gap to the magnets; a voice coil disposed in a gap between the magnets and the yoke so as to interlink with the magnetic circuit; a diaphragm with the voice coil fixed to one face thereof; a frame that supports the diaphragm at peripheral edge portions of the diaphragm and houses the magnets and the yoke; a speaker base plate fixed to the frame at the side of the frame supporting the diaphragm or at the side of the frame opposite to the side supporting the diaphragm; and a phase rotation member configured by an elastic member provided between the speaker base plate and the yoke; wherein sound is generated from both the diaphragm and the speaker base plate.

Claims

1. A composite speaker comprising:

a plurality of magnets disposed at predetermined intervals;

a yoke that forms a magnetic circuit having a magnetic gap with respect to the magnets;

a voice coil disposed in the gap between the magnets and the yoke so as to interlink with the magnetic circuit;

a diaphragm with the voice coil fixed to one face thereof;

a frame to which peripheral edge portions of the diaphragm are directly fixed and that houses the magnets and the yoke;

a speaker base plate fixed to the frame at a side thereof opposite to a side supporting the diaphragm; and

an elastic member formed from an elastic material selected from the group consisting of a thermoplastic elastomer, a vulcanized rubber and a soft resin, or formed from a foamed body of an elastic material selected therefrom, and inserted between a base face of the yoke and the speaker base plate;

wherein sound is generated from both the diaphragm and the speaker base plate.

3. The composite speaker of claim 1, wherein the magnets are disposed in a row such that two adjacent magnet poles are the reverse of each other.

4. The composite speaker of claim 1, further comprising a back plate provided between the speaker base plate and both the frame and the elastic member.

5. The composite speaker of claim 1, wherein the speaker base plate has a flat plate shape with a high order curve profile represented by the following equation, wherein the center point of the speaker base plate is at the origin of xy coordinates, r is the radius, and i is a number from 5 to 7:

rⁱ=|x|ⁱ+|y|ⁱ

6. The composite speaker of claim 1, wherein the diaphragm and the frame are formed from aluminum alloy.

10. The composite speaker of claim 3, wherein the speaker base plate has a flat plate shape with a high order curve profile represented by the following equation, wherein the center point of the speaker base plate is at the origin of xy coordinates, r is the radius, and i is a number from 5 to 7:

rⁱ=|x|ⁱ+|y|ⁱ

11. The composite speaker of claim 3, wherein the diaphragm and the frame are formed from aluminum alloy.

12. The composite speaker of claim 4, wherein the diaphragm and the frame are formed from aluminum alloy.

2. A composite speaker comprising:

a plurality of magnets disposed at predetermined intervals;

a yoke that forms a magnetic circuit having a magnetic gap with respect to the magnets;

a voice coil disposed in the gap between the magnets and the yoke so as to interlink with the magnetic circuit;

a diaphragm with the voice coil fixed to one face of the diaphragm;

a frame to which peripheral edge portions of the diaphragm are directly fixed and that houses the magnets and the yoke;

a speaker base plate fixed to the frame at a side thereof supporting the diaphragm; and

an elastic member formed from an elastic material selected from the group consisting of a thermoplastic elastomer, a vulcanized rubber and a soft resin, or formed from a foamed body of an elastic material selected therefrom, and inserted between a base face of the yoke and a base face of the frame;

wherein sound is generated from both the diaphragm and the speaker base plate.

7. The composite speaker of claim 2, further comprising a back plate provided between the speaker base plate and both the frame and the elastic member.

8. The composite speaker of claim 2, wherein the speaker base plate has a flat plate shape with a high order curve profile represented by the following equation, wherein the center point of the speaker base plate is at the origin of xy coordinates, r is the radius, and i is a number from 5 to 7:

rⁱ=|x|ⁱ+|y|ⁱ

9. The composite speaker of claim 2, wherein the diaphragm and the frame are formed from aluminum alloy.

13. The composite speaker of claim 7, wherein the diaphragm and the frame are formed from aluminum alloy.