Multifunction speaker

• US 20050207610A1
• Filed: 03/15/2005
• Published: 09/22/2005
• Est. Priority Date: 03/18/2004
• Status: Active Grant

• Current Assignee: Citizen Electronics Company Limited
• Original Assignee: Citizen Electronics Company Limited
• Inventors: Miyamoto, Kazumi, Kajiwara, Hiroo
• Granted Patent: US 7,454,031 B2
• Time in Patent Office: Days
• US Class Current: 381/396
• CPC Class Codes: B06B 1/045 using vibrating magnet, armature or coil system
• CPC Class Codes: H04M 1/03 Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
• CPC Class Codes: H04R 2201/34 Directing or guiding sound by means of a phase plug
• CPC Class Codes: H04R 2400/11 Aspects regarding the frame of loudspeaker transducers
• CPC Class Codes: H04R 2499/11 Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
• CPC Class Codes: H04R 31/006 Interconnection of transducer parts of diaphragm and outer suspension by moulding H04R31/003
• CPC Class Codes: H04R 9/00 Transducers of moving-coil, moving-strip, or moving-wire type

Abstract

A multifunction speaker has a frame made of an insulation material and having a cylindrical portion, a pair of supporting springs secured to the frame and to a magnetic circuit for supporting the magnetic circuit. The magnetic circuit comprises a pole piece having a center pole and a flange on which an annular magnet is mounted. The flange of the pole piece has a pair of positioning projections projected from a periphery of the flange for positioning the magnet.

Claims

1. A multifunction speaker comprising:

a frame made of an insulation material and having a cylindrical portion;

at least one supporting spring secured to the frame at an peripheral portion thereof;

a magnetic circuit comprising a pole piece having a center pole and a flange on which an annular magnet is mounted, and the magnetic circuit forming a magnetic gap and resiliently supported in the frame by the supporting spring at an inner portion thereof;

a diaphragm secured to the frame at a peripheral edge thereof;

a coil secured to a lower part of the diaphragm and inserted in the magnetic gap;

wherein the flange of the pole piece has at least one positioning portion for positioning the magnet.

2. The multifunction speaker according to claim 1 wherein the positioning portion comprises a plurality of positioning projections.

3. The multifunction speaker according to claim 2 wherein the positioning projections comprises a pair of positioning projections projected from a periphery of the flange.

4. The multifunction speaker according to claim 3 wherein the center pole of the pole piece has a cylindrical shape, and the positioning projections are radially and axially projected on a centerline of the pole piece so that each of the positioning projections opposes each other and has an arcuated inside wall which has the same central axis as those of the center pole and the annular magnet.

5. The multifunction speaker according to claim 4 wherein the adhering area of the annular magnet to the flange is three-dimensional.