Assignee: Foster Electric Co., Ltd.

Location: Tokyo, JP
No. of patents: 19

Number	Title	Issue Date
7324834	Speaker system A speaker system functioning as a stand capable of power supply to a mobile phone and hand-free communication and being capable of derived surround reproduction or stereo reproduction is provided. An enclosure (201), on which a mobile phone is placed, include...	01/29/2008
D558187	Speaker diaphragm dome	12/25/2007
7184567	Thin speaker and method of manufacturing the speaker A thin speaker having a magnetic circuit (2) disposed at the front of a cone-like diaphragm, wherein an internal magnetic type magnetic circuit (2) and a vibration system are supported by a sufficiently strong frame formed of two pieces having an outli...	02/27/2007
7181041	Flat speaker of full-face driving Ring magnets (5) are concentrically placed with certain spacings (6) on a magnetic frame (4). The magnetic members on the magnets (5) are removed, and the magnets are arranged so that the polarities of adjacent magnets (5)are alter...	02/20/2007
6940991	Damper for loudspeaker and method for manufacturing same A damper for loudspeaker is constituted by mounting tubular knitted tinsel cords through an adhesive agent of acrylic emulsions having a tackiness onto one surface of a corrugated damper body. The damper is thereby rendered easily manufacturable and highly flexible ...	09/06/2005
6899794	Speaker device, and method and device for producing the same A liquefied paper material is used as raw materials. A paper frame member 1 supporting a vibrating plate is paper-skimmed and formed. On paper-skimming and forming, a central hole for use in voice coils, air-release hole 1a releasing air pressur...	05/31/2005
6845166	Plane driving type electroacoustic transducer A plane driving type electroacoustic transducer having a film of diaphragm with a conduction pattern formed thereon and a magnetic circuit, wherein a vibration damping layer is provided on the diaphragm. ...	01/18/2005
6832106	Electroacoustic transducer A diaphragm for electroacoustic transducers including loudspeakers as formed substantially in a dome shape having an outer periphery of a circular shape and made excellent in tone quality is provided. The dome shape of the diaphragm has an irregular section with a c...	12/14/2004
6771792	Track-shaped loudspeaker An elongated oval track-shaped loudspeaker has a diaphragm of a track-shape having major and minor axes, and a pole piece of an elongated oval shape and disposed to conform its major axis to that of the diaphragm, whereby a sufficient space is secured for a width si...	08/03/2004
6371241	Speaker device A speaker frame is constructed from dried paper pulp. Features in the speaker frame such as holes or slits are formed by carbonizing corresponding sections in the dried paper pulp and applying shear processing to remove the carbonized material. A carboniz...	04/16/2002
6183674	Manufacturing method of diaphragm for use in electroacoustic transducers A manufacturing method of diaphragms for use in electroacoustic transducers simultaneously joins an edge and a diaphragm body upon molding the diaphragm body through an injection molding with a set of mating molds for forming the diaphragm body, with the ...	02/06/2001
6134337	Loudspeaker In a loudspeaker, a diaphragm is equally divided circumferentially into a plurality of regions which have the same shape with each other. Each of the divided regions is formed by a hyperbolic paraboloid. The hyperbolic paraboloid is obtained by moving a s...	10/17/2000
5796054	Loudspeaker diaphragm A loudspeaker diaphragm is provided as an injection molded material including 50 to 80 weight % of a matrix resin of polyolefins and 20 to 50 weight % of flaky mica having an average aspect ratio of more than 10 and including at least 3 weight % or more o...	08/18/1998
5740264	Miniature electroacoustic transducer An electroacoustic transducer has a diaphragm body including a planar diaphragm having an outer periphery in an elongated generally elliptical shape with semicircular ends and major and minor axes, and an elastometic edge having an outer periphery of an e...	04/14/1998
5740265	Loudspeaker unit and loudspeaker system employing the unit A loudspeaker unit includes a magnetic system of dual magnetic gaps formed with a permanent magnet disk carrying on both sides top and bottom plates and a cylindrical yoke surrounding the plates to form therebetween upper and lower magnetic gaps, and a vi...	04/14/1998
5705108	Method for making edge for loudspeaker diaphragm An edge for loudspeaker diaphragm is made by disposing a diaphragm one of a pair of mating molds, disposing a strip-shaped base material of the edge on the said one of the molds, and hot-molding them with the other mold mated with the one mold. Foaming ac...	01/06/1998
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
5511131	Loudspeaker A loudspeaker has two magnets disposed directly with respect to voice coils for generating a repulsion magnetic field at the voice coils, without interposition of yoke but with mutually repulsing magnetic polarities of the magnets, and a diaphragm directl...	04/23/1996
5371806	Loudspeaker A loudspeaker has two magnets disposed directly with respect to voice coils for generating a repulsion magnetic field at the voice coils, without interposition of yoke but with mutually repulsing magnetic polarities of the magnets, and a diaphragm directl...	12/06/1994

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Assignee: Foster Electric Co., Ltd.