Class 181/174 - Variable thickness

Subclass of Class 181 - Acoustics
Definition: Subject matter wherein the thickness of the vibratable partition
No. of patents: 29
Last issue date: 03/31/2009

Number	Title	Issue Date
7510048	Diaphragms for loudspeaker drive units A diaphragm for a loudspeaker drive unit (1), the diaphragm comprising a block of material having a first, sound-radiating front face (20) and a second, rear face (22). The block is stiffened by being bound about over the first and second faces ...	03/31/2009
7280668	Ceramic metal matrix diaphragm for loudspeakers This invention provides a method of manufacturing speaker diaphragm for a loudspeaker that has a composite material formed of two layers of ceramic material separated by a light metal substrate and where the core is formed by stamping a sheet of standard gauge alumi...	10/09/2007
7275620	Square speaker A square speaker is disclosed having a novel surround with a novel rounded corner design and with a magnet assembly and former sized, shaped, and arranged to exploit the increased excursions enabled by the novel surround. The arcuate portion of the rounded corner fe...	10/02/2007
7152299	Method of assembling a loudspeaker Electro-dynamic loudspeakers typically include a diaphragm having a conductor applied to one of its surfaces. The diaphragm is secured to a frame. The conductor is connected to a power supply for providing electrical current through linear traces of the conductor th...	12/26/2006
6920957	Loudspeaker diaphragm A loudspeaker diaphragm affixed with a coil includes an edge portion located outside of a portion affixed with the coil and a center portion located inside of the portion affixed with the coil. The center portion is provided thereon with ribs. With these ribs, the h...	07/26/2005
6889796	Loudspeaker suspension An annular surround for a loudspeaker cone wherein a radial cross-section of the surround varies around the circumferential extent of the surround, so as to accommodate peripheral expansion or contraction of the surround by bending. Thus a trough shaped cross-sectio...	05/10/2005
6757404	Loud speaker, diaphragm and process for making the diaphragm A diaphragm is gained by the co-molded of a dome part, a voice coil junction part, a cone part and a peripheral part through the injection mold of thermoplastic resin. The thickness of the central part of the dome is made great so that the resonance amplitude in thi...	06/29/2004
6493452	Speaker unit A speaker unit includes a woofer having a diaphragm with an ellipse shape sound emitting opening, and a separate speaker having an ellipse shape diaphragm with an area smaller than that of the diaphragm of the woofer, located in front of the diaphragm of ...	12/10/2002
6026929	High frequency radially arcuated center speaker cone with variable thickness The present invention is directed to an improved high frequency acoustic speaker center cone, which may be located at a speaker coil tubular support, tube wherein the cone has a plurality of thin, pie-shaped segments radiating outwardly with each of the s...	02/22/2000
5744761	Diaphragm-edge integral moldings for speakers and acoustic transducers comprising same A diaphragm for speakers comprises a self-support, shaped body including a tightly woven synthetic polymer fiber cloth substrate which has at least a diaphragm portion and edge portion shaped integrally with and extending from the diaphragm portion. The d...	04/28/1998
5714722	Loudspeaker The present invention provides a loudspeaker including a case having an inner wall, a front opening, and an edge surrounding the front opening. A diaphragm including a substantially planar front surface, a rear surface, and a periphery is attached to the ...	02/03/1998
5693917	Planar diaphragm loudspeaker A planar diaphragm loudspeaker incorporating a planar diaphragm having multiple sound producing regions, a support frame, and one or more electromagnetic drivers coupled to the sound producing regions on the rear surface of the diaphragm. A first sound pr...	12/02/1997
5619019	Damper for loudspeaker A damper for a loudspeaker has an improved linearity of the amount of strain caused by the vibrational energy to vibrational energy exerted on the damper to enable the loudspeaker to reproduce sounds in a high fidelity. The damper is formed such that the ...	04/08/1997
4949806	Headset for underwater use A headset is provided which includes an inverted cup-shaped housing. The housing contains a rigid membrane which separates the housing into an upper chamber and a lower chamber. An inertial transducer is positioned in the upper chamber secured to the memb...	08/21/1990
4939784	Loudspeaker structure A dipole loudspeaker includes a rigid support containing an opening and a generally planar multi-layered flexible diaphragm mounted on the support and extending across the opening. The diaphragm is formed of a plurality of layers of thin flexible membrane...	07/03/1990
4928312	Acoustic transducer An acoustic transducer loudspeaker for converting variations of electrical energy into corresponding variations of acoustic energy is formed of one piece of foamed polymer material having different densities in different portions thereof. The one piece of...	05/22/1990
4847908	Loudspeaker having a two-part diaphragm for use as a car loudspeaker An electrodynamic loudspeaker (1) has a diaphragm comprising a central part (2) and a peripheral part (3), and a voice-coil device (9, 10) coupled to the central part (2). The surface ratio S2 /S1 complies with the relationship 0.5�...	07/11/1989
4532383	Electroacoustic transducer having a variable thickness diaphragm To provide for good wide range frequency response utilizing only a single lightweight diaphragm in a peripherally-driven electroacoustic transducer, the diaphragm is made with a variable thickness. The region along the peripheral edge of the diaphragm is ...	07/30/1985
4395597	Speaker diaphragm assembly and a method of manufacturing the same A speaker diaphragm assembly comprises a body made of a foam resin, and a sound radiating surface portion integrally formed with the body. In one embodiment, the sound radiating surface portion is made of a foam resin the density of which is greater than ...	07/26/1983
4384174	Moving voice coil loudspeaker, peripheral diaphragm support, diaphragm construction, bobbin to diaphragm reinforcement The diaphragm of a speaker is supported by a viscous supporting member placed in an annular gap defined between the periphery of the diaphragm and the inner surface of a frame structure and by a conventional damper. Grooves may be made in the periphery of...	05/17/1983
4257325	Mouting of a substantially planar diaphragm defining a sound transducer Mounting of a substantially planar diaphragm defining a sound transducer, having a central portion surrounded by stepwise interconnected outer plates to assure correctly guided vibratory movement of the central portion. Recesses in the central portion ope...	03/24/1981
4239090	High accuracy bass reproducer device The present invention is directed to an apparatus for reproducing the bass components of an audio signal with a high degree of accuracy and minimal distortion, utilizing an enclosure of relatively small size. The apparatus comprises a substantially sealed...	12/16/1980
4184563	Planar diaphragm and supporting frame assembly A substantially planar diaphragm and supporting frame assembly, preferably for loudspeakers, where on the rear face side of said diaphragm there is an asymmetrically shaped sound producing portion defining the central portion of said diaphragm, which cent...	01/22/1980
4183422	Underwater communications device A communications device for use under water by a human speaker. A tubular base member has a mouthpiece located at one open end thereof and an inflatable air bag mounted about another open end thereof. In use, the speaker places the mouthpiece around his m...	01/15/1980
4163876	Electro-acoustic transducer with variable thickness foam surfaced diaphragm An electro-acoustic transducer having a flat sound radiating plane is disclosed, in which a voice coil bobbin having a voice coil wound around an outer circumference thereof is inserted in an air gap defined by an inner pole piece and an outer pole piece ...	08/07/1979
4132872	Ribbed conical-central dome diaphragm with tapered thickness components A movable coil type electroacoustic vibrating plate of rigid structure, composed of two principal parts, one being a thin-walled annular plate portion, having concentrical outer periphery and inner periphery, of substantially truncated conical configurati...	01/02/1979
4086450	Variable thickness cone for a dynamic speaker and quality control inspection method therefor A dynamic speaker including a cone, which is of relatively thin rigid truncated cone shape, having a number of radial ribs extending from the central opening portion toward the peripheral portion thereof, and being progressively diminishing, in respect of...	04/25/1978
4013846	Piston loudspeaker An electroacoustic loudspeaker having a rigid, light-weight diaphragm and a substantially closed loop magnet support of a magnetically permeable material having a channel-shaped cross-section and supported adjacent and spaced from the diaphragm with the o...	03/22/1977
4003449	Planar diaphragm A planar diaphragm, preferably for loudspeakers where, on the rear face side there is an asymmetrically shaped sound producing portion, surrounded by marginal and channel shaped portions to assure that sound waves generated by said sound producing portion...	01/18/1977

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Class 181/174 - Variable thickness