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Class Information
Number: 181/174
Name: Acoustics > Diaphragm > Particular shape > Variable thickness
Description: Subject matter wherein the thickness of the vibratable partition constituting the diaphragm varies across its surface.










Patents under this class:

Patent Number Title Of Patent Date Issued
8646570 Diaphragm of electric sound converter and its manufacturing method Feb. 11, 2014
8532327 Diaphragm and speaker device provided with the same Sep. 10, 2013
8224016 Electroacoustic transducer having multi-channel diaphragm and hearing aid using the same Jul. 17, 2012
RE42490 Device and method for amplifying suction noise Jun. 28, 2011
7946378 Membrane for an electroacoustic transducer May. 24, 2011
7866439 Membrane for an electroacoustic transducer Jan. 11, 2011
7717230 Device and method for amplifying suction noise May. 18, 2010
7568552 Acoustic passive radiator rocking mode reducing Aug. 4, 2009
7510048 Diaphragms for loudspeaker drive units Mar. 31, 2009
7280668 Ceramic metal matrix diaphragm for loudspeakers Oct. 9, 2007
7275620 Square speaker Oct. 2, 2007
6889796 Loudspeaker suspension May. 10, 2005
6863153 Loudspeaker diaphragm Mar. 8, 2005
6757404 Loud speaker, diaphragm and process for making the diaphragm Jun. 29, 2004
6493452 Speaker unit Dec. 10, 2002
6026929 High frequency radially arcuated center speaker cone with variable thickness Feb. 22, 2000
5744761 Diaphragm-edge integral moldings for speakers and acoustic transducers comprising same Apr. 28, 1998
5714722 Loudspeaker Feb. 3, 1998
5693917 Planar diaphragm loudspeaker Dec. 2, 1997
5619019 Damper for loudspeaker Apr. 8, 1997
4949806 Headset for underwater use Aug. 21, 1990
4939784 Loudspeaker structure Jul. 3, 1990
4928312 Acoustic transducer May. 22, 1990
4847908 Loudspeaker having a two-part diaphragm for use as a car loudspeaker Jul. 11, 1989
4532383 Electroacoustic transducer having a variable thickness diaphragm Jul. 30, 1985
4395597 Speaker diaphragm assembly and a method of manufacturing the same Jul. 26, 1983
4384174 Moving voice coil loudspeaker, peripheral diaphragm support, diaphragm construction, bobbin to diaphragm reinforcement May. 17, 1983
4257325 Mouting of a substantially planar diaphragm defining a sound transducer Mar. 24, 1981
4239090 High accuracy bass reproducer device Dec. 16, 1980
4184563 Planar diaphragm and supporting frame assembly Jan. 22, 1980
4183422 Underwater communications device Jan. 15, 1980
4163876 Electro-acoustic transducer with variable thickness foam surfaced diaphragm Aug. 7, 1979
4132872 Ribbed conical-central dome diaphragm with tapered thickness components Jan. 2, 1979
4086450 Variable thickness cone for a dynamic speaker and quality control inspection method therefor Apr. 25, 1978
4013846 Piston loudspeaker Mar. 22, 1977
4003449 Planar diaphragm Jan. 18, 1977











 
 
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