Diaphragm, flat-type acoustic transducer, and flat-type...

Details Diaphragm, flat-type acoustic transducer, and flat-type... Diaphragm, flat-type acoustic transducer, and flat-type...

2005-11-08

2005-11-08

Tran, Sinh (Department: 2646)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S399000

Reexamination Certificate

active

06963654

ABSTRACT:
A first conductor and a second conductor are provided at a diaphragm. The first and second conductors intersect magnetic force lines between north poles and south poles of permanent magnets M which are adjacent to one another. When electricity passes through the conductors, a direction in which a force from the magnetic field acts on the current is substantially orthogonal to a surface of the diaphragm. Therefore, the diaphragm can be oscillated in the direction orthogonal to the diaphragm surface. The conductors have widths of from 1000 μm to 2000 μm. Therefore, relative errors in the widths caused by etching can be greatly reduced compared to the prior art, and etching is easier. Moreover, the conductors are arranged in a zigzag pattern. Because the conductors do not have a coil form, a large number of through-holes is not required as in conventional products.

REFERENCES:
patent: 4337379 (1982-06-01), Nakaya
patent: 4471173 (1984-09-01), Winey
patent: 4480155 (1984-10-01), Winey
patent: 5297214 (1994-03-01), Bruney
patent: 6480614 (2002-11-01), Denda et al.
patent: 3159714 (2001-04-01), None
patent: WO-99/03304 (1999-01-01), None

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