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Class Information
Number: 181/165
Name: Acoustics > Diaphragm > Sectional diaphragm > Concentric annular section
Description: Subject matter wherein the diaphragm has a central section which is attached to and surrounded by at least one concentric, annular portion.










Patents under this class:

Patent Number Title Of Patent Date Issued
8442261 Diaphragm including a first vibrating part of a dome shape or flat shape and a second vibrating part of an annular shape and a loudspeaker using the diaphragm May. 14, 2013
8284964 Compound membrane, method of manufacturing the same, and acoustic device Oct. 9, 2012
8215445 Electroacoustic transducer Jul. 10, 2012
8139784 Compound loudspeaker Mar. 20, 2012
8135164 Speaker Mar. 13, 2012
7438156 Diaphragm, spherical-shell diaphragm and electroacoustic transducer, and method of manufacturing electroacoustic transducer Oct. 21, 2008
7428946 Suspension and electro-acoustic transducer using the suspension Sep. 30, 2008
7360626 Audio speaker with wobble free voice coil movement Apr. 22, 2008
6785397 Electro-acoustic converter Aug. 31, 2004
6578661 Speaker apparatus Jun. 17, 2003
6513623 Speaker Feb. 4, 2003
6095278 Base for holding the tweeter of a speaker Aug. 1, 2000
5590211 Microphone Dec. 31, 1996
5471437 Electrodynamic acoustic transducer Nov. 28, 1995
5339286 Composite electroacoustic transducer Aug. 16, 1994
5283397 Diaphragm for electrodynamic transducer Feb. 1, 1994
5027411 High frequency loudspeaker Jun. 25, 1991
4847908 Loudspeaker having a two-part diaphragm for use as a car loudspeaker Jul. 11, 1989
4837839 Compact speaker assembly with improved low frequency response Jun. 6, 1989
4796725 Electrostatic transducer Jan. 10, 1989
4532383 Electroacoustic transducer having a variable thickness diaphragm Jul. 30, 1985
4379951 Electro-acoustic transducer means Apr. 12, 1983
4357498 Coaxial type multi-way planar diaphragm loudspeaker system Nov. 2, 1982
4320264 Loudspeaker with a heat resistant two-part diaphragm Mar. 16, 1982
4315112 Speaker Feb. 9, 1982
4225757 Broad band dynamic loudspeaker Sep. 30, 1980
4146756 Moving voice coil transducer with diaphragm having concentric sections of opposite curvature Mar. 27, 1979
4132872 Ribbed conical-central dome diaphragm with tapered thickness components Jan. 2, 1979
4064365 Loudspeaker assembly with restructured diaphragm including a tweeter driven by a bass amplifier Dec. 20, 1977











 
 
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