Loudspeaker

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having electrostatic element

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Details

381192, 381197, H04R 2500

Patent

active

056640242

ABSTRACT:
The loudspeaker of the invention includes: a frame; a diaphragm, a planar shape thereof being non-axisymmetric having a larger diameter and a smaller diameter when the diaphragm is viewed from a vibration direction thereof; a band-shaped edge portion provided around an outer periphery of the diaphragm, an outer periphery of the edge portion being connected to the frame and an inner periphery of the edge portion being connected to the diaphragm; a cylindrical voice coil bobbin in a non-axisymmetric shape having a larger diameter and a smaller diameter which includes a pair of opposed faces parallel to each other in a larger diameter direction, one end portion of the voice coil bobbin being connected to the diaphragm; a voice coil wound around the voice coil bobbin; a plurality of voice coil bobbin reinforcing members in a plate shape which are bridged between the pair of opposed faces parallel to each other of the voice coil bobbin; and a plurality of magnetic circuits having a gap for applying magnetic fluxes to at least a part of the voice coil.

REFERENCES:
patent: 1846351 (1932-02-01), Murkham et al.
patent: 2105934 (1938-01-01), Stevens
patent: 3134057 (1964-05-01), Tsunoo et al.
patent: 3496307 (1970-02-01), Sotome
patent: 3873784 (1975-03-01), Doschek
patent: 3935400 (1976-01-01), Koga
patent: 4334127 (1982-06-01), Shimada et al.
patent: 4492827 (1985-01-01), Shintaku
Search Report for European Appl. 95106124.1, mailed Jul. 27, 1995.

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