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US 6,744,895 B2Granted
Loudspeaker
AssigneeCitizen Electronics Co., Ltd.
InventorsKazumi Miyamoto, Masahito Furuya
Life of this patent
Estimating the term…
Abstract
A loudspeaker has first and second diaphragms provided in a case. A first voice coil is provided for vibrating the first diaphragm, and a second voice coil is provided for vibrating the second diaphragm. A first permanent magnet is provided for applying a magnetic flux to the first voice coil, and a second permanent magnet is provided for applying a magnetic flux to the second voice coil.
Claims1
A loudspeaker, comprising:
- a cylindrical case;
- a first diaphragm provided in the case at an upper side portion thereof;
- a second diaphragm provided in the case at a lower side portion thereof;
- an annular first voice coil secured to an underside of the first diaphragm for vibrating the first diaphragm;
- an annular second voice coil secured to an upper side of the second diaphragm for vibrating the second diaphragm;
- an annular first permanent magnet;
- a second permanent magnet disposed within an inner space of the annular first permanent magnet;
- a first magnetic gap formed on an outer side of the second permanent magnet for applying a magnetic flux to the first voice coil;
- and
- a second permanent magnetic gap formed on an inner side of the annular first permanent magnet for applying a magnetic flux to the second voice coil.
7 more elements
Dependencies are inferred from the claim text.