Patents by Inventor Kiyotaka Tajima
Kiyotaka Tajima has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7067959Abstract: A piezoelectric diaphragm has principal-surface electrodes formed on upper and lower principal surfaces of a multilayer ceramic body. An internal electrode is disposed in an interface between adjacent piezoelectric ceramic layers. The upper and lower principal surfaces of the multilayer ceramic body are substantially entirely covered with a resin layer. A first cutout is formed in a side-edge portion, along the first side surface electrode, of the upper resin layer such that the upper principal-surface electrode is partially exposed in the first cutout. A second cutout is formed in a side-edge portion, along the first side surface electrode, of the lower resin layer such that the lower principal-surface electrode is partially exposed in the second cutout. The locations of the first and second cutouts formed in the upper and lower resin layers, respectively, are selected such that they do not oppose each other.Type: GrantFiled: October 7, 2003Date of Patent: June 27, 2006Assignee: Murata Manufacturing Co., LTD.Inventors: Tetsuo Takeshima, Kiyotaka Tajima, Yuji Kosugi
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Patent number: 7042138Abstract: A piezoelectric type electroacoustic transducer includes a piezoelectric vibrating plate including a plurality of piezoelectric ceramic layers laminated to each other with an internal electrode being interposed between the piezoelectric ceramic layers, and main surface electrodes disposed on the main surfaces on the front and back sides of the piezoelectric vibrating plate, whereby the piezoelectric vibrating plate is surface-flexural-vibrated in the thickness direction thereof with an AC signal applied between the main surface electrodes and the internal electrode, and a box having supporting portions on which the outer peripheral portions on the back side of the piezoelectric vibrating plate is supported, the piezoelectric vibrating plate having a protecting film substantially on the entire surface on the back-side only or on the front and back sides of the piezoelectric vibrating plate, and the protecting film being formed by applying a resin in a film-shape and hardening the resin, or by bonding an adhesiType: GrantFiled: January 27, 2004Date of Patent: May 9, 2006Assignee: Murata Manufacturing Co., Ltd.Inventors: Yuko Yokoi, Kiyotaka Tajima, Manabu Sumita
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Patent number: 6894423Abstract: A piezoelectric electroacoustic transducer is miniaturized and has a reduced frequency, and even when a diaphragm has a warp or winding, the resonance frequency is be stabilized. The piezoelectric electroacoustic transducer includes a substantially rectangular piezoelectric diaphragm flexurally vibrating in a thickness direction in response to the application of an alternating signal between electrodes and a casing for accommodating the piezoelectric diaphragm, wherein the casing is provided with supporting members for supporting four corners of the piezoelectric diaphragm.Type: GrantFiled: June 26, 2002Date of Patent: May 17, 2005Assignee: Murata Manufacturing Co., Ltd.Inventors: Tetsuo Takeshima, Yoshitaka Nakamura, Kiyotaka Tajima
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Publication number: 20040201326Abstract: A piezoelectric type electroacoustic transducer includes a piezoelectric vibrating plate including a plurality of piezoelectric ceramic layers laminated to each other with an internal electrode being interposed between the piezoelectric ceramic layers, and main surface electrodes disposed on the main surfaces on the front and back sides of the piezoelectric vibrating plate, whereby the piezoelectric vibrating plate is surface-flexural-vibrated in the thickness direction thereof with an AC signal applied between the main surface electrodes and the internal electrode, and a box having supporting portions on which the outer peripheral portions on the back side of the piezoelectric vibrating plate is supported, the piezoelectric vibrating plate having a protecting film substantially on the entire surface on the back-side only or on the front and back sides of the piezoelectric vibrating plate, and the protecting film being formed by applying a resin in a film-shape and hardening the resin, or by bonding an adhesiType: ApplicationFiled: January 27, 2004Publication date: October 14, 2004Applicant: Murata Manufacturing Co., Ltd.Inventors: Yuko Yokoi, Kiyotaka Tajima, Manabu Sumita
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Publication number: 20040124748Abstract: A piezoelectric diaphragm has principal-surface electrodes formed on upper and lower principal surfaces of a multilayer ceramic body. An internal electrode is disposed in an interface between adjacent piezoelectric ceramic layers. The upper and lower principal surfaces of the multilayer ceramic body are substantially entirely covered with a resin layer. A first cutout is formed in a side-edge portion, along the first side surface electrode, of the upper resin layer such that the upper principal-surface electrode is partially exposed in the first cutout. A second cutout is formed in a side-edge portion, along the first side surface electrode, of the lower resin layer such that the lower principal-surface electrode is partially exposed in the second cutout. The locations of the first and second cutouts formed in the upper and lower resin layers, respectively, are selected such that they do not oppose each other.Type: ApplicationFiled: October 7, 2003Publication date: July 1, 2004Applicant: Murata Manufacturing Co., Ltd.Inventors: Tetsuo Takeshima, Kiyotaka Tajima, Yuji Kosugi
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Patent number: 6744180Abstract: A piezoelectric electroacoustic transducer includes two electrodes, a substantially square piezoelectric diaphragm producing a bending vibration in the thickness direction thereof in response to application of an alternating voltage between the two electrodes, a housing for housing the piezoelectric diaphragm, an elastic sealant for sealing the gap between the periphery of the diaphragm and the inner side surface of the housing, supports, disposed in the housing, for supporting at least two mutually opposing sides of the piezoelectric diaphragm or the four corners of the piezoelectric diaphragm, grooves which are disposed in the housing so as to face the periphery of the rear surface of the piezoelectric diaphragm and in which the elastic sealant is filled, and walls defining inner portions of the grooves, arranged such that the upper surfaces of the walls are located below those of the supports, for preventing the elastic sealant from flowing out to the bottom of the housing.Type: GrantFiled: October 16, 2002Date of Patent: June 1, 2004Assignee: Murata Manufacturing Co., Ltd.Inventors: Yoshitaka Nakamura, Kiyotaka Tajima, Tetsuo Takeshima, Yuko Yokoi, Tadashi Okuzawa
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Publication number: 20030107300Abstract: A piezoelectric electroacoustic transducer includes two electrodes, a substantially square piezoelectric diaphragm producing a bending vibration in the thickness direction thereof in response to application of an alternating voltage between the two electrodes, a housing for housing the piezoelectric diaphragm, an elastic sealant for sealing the gap between the periphery of the diaphragm and the inner side surface of the housing, supports, disposed in the housing, for supporting at least two mutually opposing sides of the piezoelectric diaphragm or the four corners of the piezoelectric diaphragm, grooves which are disposed in the housing so as to face the periphery of the rear surface of the piezoelectric diaphragm and in which the elastic sealant is filled, and walls defining inner portions of the grooves, arranged such that the upper surfaces of the walls are located below those of the supports, for preventing the elastic sealant from flowing out to the bottom of the housing.Type: ApplicationFiled: October 16, 2002Publication date: June 12, 2003Applicant: Murata Manufacturing Co., Ltd.Inventors: Yoshitaka Nakamura, Kiyotaka Tajima, Tetsuo Takeshima, Yuko Yokoi, Tadashi Okuzawa
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Patent number: 6570299Abstract: A piezoelectric electroacoustic transducer includes a substantially square piezoelectric diaphragm flexually vibrating in a plate-thickness direction in response to application of an alternating signal between electrodes, a substantially rectangular insulating case having a supporting member disposed inside sidewalls of the case for supporting the diaphragm, terminals having internal connections exposed in a vicinity of the supporting member and external connections exposed outside the case and electrically connecting to the internal connections, a first adhesive applied to a shortest route located between the external periphery of the diaphragm and the internal connections and connecting the diaphragm to the internal connections so as to fix the diaphragm to the case, a conductive adhesive applied to electrodes of the diaphragm and the internal connections via the upper surface of the first adhesive by detouring from the shortest route to connect the diaphragm to the internal connections for electrically conType: GrantFiled: May 30, 2002Date of Patent: May 27, 2003Assignee: Murata Manufacturing Co., Ltd.Inventors: Tetsuo Takeshima, Manabu Sumita, Kiyotaka Tajima, Yuichi Sakai
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Publication number: 20030015942Abstract: A piezoelectric electroacoustic transducer is miniaturized and has a reduced frequency, and even when a diaphragm has a warp or winding, the resonance frequency is be stabilized. The piezoelectric electroacoustic transducer includes a substantially rectangular piezoelectric diaphragm flexurally vibrating in a thickness direction in response to the application of an alternating signal between electrodes and a casing for accommodating the piezoelectric diaphragm, wherein the casing is provided with supporting members for supporting four corners of the piezoelectric diaphragm.Type: ApplicationFiled: June 26, 2002Publication date: January 23, 2003Applicant: Murata Manufacturing Co., Ltd.Inventors: Tetsuo Takeshima, Yoshitaka Nakamura, Kiyotaka Tajima
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Publication number: 20020195901Abstract: A piezoelectric electroacoustic transducer includes a substantially square piezoelectric diaphragm flexually vibrating in a plate-thickness direction in response to application of an alternating signal between electrodes, a substantially rectangular insulating case having a supporting member disposed inside sidewalls of the case for supporting the diaphragm, terminals having internal connections exposed in a vicinity of the supporting member and external connections exposed outside the case and electrically connecting to the internal connections, a first adhesive applied to a shortest route located between the external periphery of the diaphragm and the internal connections and connecting the diaphragm to the internal connections so as to fix the diaphragm to the case, a conductive adhesive applied to electrodes of the diaphragm and the internal connections via the upper surface of the first adhesive by detouring from the shortest route to connect the diaphragm to the internal connections for electrically conType: ApplicationFiled: May 30, 2002Publication date: December 26, 2002Applicant: Murata Manufacturing Co., Ltd.Inventors: Tetsuo Takeshima, Manabu Sumita, Kiyotaka Tajima, Yuichi Sakai
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Patent number: 5965615Abstract: The invention relates to a hydroxyl radical scavenger and a remedy composition for a disease caused by a hydroxyl radical, which each comprise, as an active ingredient, a betaine represented by the formula (1):(CH.sub.3).sub.3 N.sup.+ (CH.sub.2).sub.n COO.sup.- (1)wherein n is an integer of 1-5, or an acid-addition salt or ester salt thereof. The betaine is useful in treating a disease caused by a hydroxyl radical, in particular, cardiopathy.Type: GrantFiled: March 25, 1997Date of Patent: October 12, 1999Assignees: Taiho Pharmaceutical Co., Ltd., Valsts zinatniska iestade - bezpelnas organizacija Latvijas organiskas sintezes institutsInventors: Ivars Kalvinsh, Maris Veveris, Yasushi Abiko, Kiyotaka Tajima