| US 7,454,031 B2 | ||
| Multifunction speaker | ||
| Hiroo Kajiwara, Yamanashi-ken (Japan); and Kazumi Miyamoto, Yamanashi-ken (Japan) | ||
| Assigned to Citizen Electronics Co., Ltd., Fujiyoshida-shi, Yamanashi-ken (Japan) | ||
| Filed on Mar. 15, 2005, as Appl. No. 11/79,103. | ||
| Claims priority of application No. 2004-077672 (JP), filed on Mar. 18, 2004. | ||
| Prior Publication US 2005/0207610 A1, Sep. 22, 2005 | ||
| Int. Cl. H04R 25/00 (2006.01) | ||
| U.S. Cl. 381—396 [381/396; 381/189; 381/191; 381/430] | 4 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 outer peripheral portion thereof;
a magnetic circuit comprising a pole piece having a center pole and a flange having positioning projections axially projecting
from peripheral portions of the flange, the magnetic circuit further comprising an annular magnet positioned around the center
pole and mounted on a surface of the flange, and an annular top plate mounted on the annular magnet and configured to form
a magnetic gap between the center pole and the annular top plate, the magnetic circuit being resiliently supported in the
frame by the supporting spring;
a diaphragm secured to the frame at an outer peripheral edge thereof and having a surface opposing the magnetic circuit;
a coil secured to a surface of the diaphragm and inserted in the magnetic gap;
wherein the positioning projections each have an inside surface configured to be adhesively engaged with an outer periphery
of the annular magnet, and the annular magnet is configured to be positioned by the inside surfaces of the positioning projections.
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