Patents by Inventor Hidekazu Kitamura
Hidekazu Kitamura 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: 8405472Abstract: An elastic wave filter device includes first and second inductance elements included in a laminated substrate and first and second elastic wave filter chips mounted on the laminated substrate by flip-chip bonding. The first and second inductance elements provided in the laminated substrate include first and second coil patterns, respectively, which are provided in a plane located at a certain height level in the laminated substrate. The second coil pattern is arranged in a region in which the first coil pattern is provided.Type: GrantFiled: October 25, 2010Date of Patent: March 26, 2013Assignee: Murata Manufacturing Co., Ltd.Inventor: Hidekazu Kitamura
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Publication number: 20110037535Abstract: An elastic wave filter device includes first and second inductance elements included in a laminated substrate and first and second elastic wave filter chips mounted on the laminated substrate by flip-chip bonding. The first and second inductance elements provided in the laminated substrate include first and second coil patterns, respectively, which are provided in a plane located at a certain height level in the laminated substrate. The second coil pattern is arranged in a region in which the first coil pattern is provided.Type: ApplicationFiled: October 25, 2010Publication date: February 17, 2011Applicant: Murata Manufacturing Co., Ltd.Inventor: Hidekazu KITAMURA
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Patent number: 6794956Abstract: A circuit substrate includes resistive films are disposed on the surfaces of lands included in a circuit pattern and these resistive films are used as resistances connected in series to a capacitor. Therefore, the resistances are connected in series without increasing the inductance in the capacitor, and accordingly, a circuit having a small impedance variation with respect to frequency can be obtained. Therefore, it is possible to obtain a power supply circuit and so forth having stable operation and fast response.Type: GrantFiled: August 20, 2002Date of Patent: September 21, 2004Assignee: Murata Manufacturing Co., Ltd.Inventors: Masaaki Taniguchi, Hidekazu Kitamura
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Patent number: 6618929Abstract: A laminated common-mode choke coil is disclosed in which the coupling characteristics of first and second coil electrodes are improved so as to reduce normal mode impedance. A first coil electrode and a second coil electrode are laminated across an insulating layer. The first coil electrode is formed in a spiral shape in an area from a first external electrode to a first through-hole electrode (point L). A second coil electrode is formed in a spiral shape in an area from a third external electrode to a second through--hole electrode (point K). Both coil electrodes are spirally overlapped with each other in an area from point B to point K. Three coil embodiments are also disclaosed.Type: GrantFiled: January 22, 2002Date of Patent: September 16, 2003Assignee: Murata Manufacturing Co., Ltd.Inventor: Hidekazu Kitamura
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Publication number: 20030057470Abstract: A circuit substrate includes resistive films are disposed on the surfaces of lands included in a circuit pattern and these resistive films are used as resistances connected in series to a capacitor. Therefore, the resistances are connected in series without increasing the inductance in the capacitor, and accordingly, a circuit having a small impedance variation with respect to frequency can be obtained. Therefore, it is possible to obtain a power supply circuit and so forth having stable operation and fast response.Type: ApplicationFiled: August 20, 2002Publication date: March 27, 2003Applicant: Murata Manufacturing Co., LtdInventors: Masaaki Taniguchi, Hidekazu Kitamura
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Patent number: 6448879Abstract: A coil component uses a magnetic material having a relative permeability of a specified value or more which permits deviations in inductance to vary within a narrow range, even if the magnetic substrate material has a relative permeability having large deviations. The coil component includes a pair of magnetic substrates, non-magnetic layers and a coil. The non-magnetic layers and the coil are laminated between the magnetic substrates. A relative permeability of a material of the magnetic substrates is set such that a combined magnetic resistance R1 of the magnetic substrates which define a closed series magnetic circuit including the pair of magnetic substrates and the non-magnetic layers, and a combined magnetic resistance R2 of the non-magnetic layers have a relationship: R2>R1.Type: GrantFiled: December 16, 1998Date of Patent: September 10, 2002Assignee: Murata Manufacturing Co., Ltd.Inventor: Hidekazu Kitamura
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Patent number: 6441539Abstract: A piezoelectric resonator includes a laminated structure having a piezoelectric laminate, at least one pair of electrodes and a substrate. The piezoelectric laminate includes at least one first piezoelectric layer having a positive temperature coefficient of a resonant frequency and at least one second piezoelectric layer which has a negative temperature coefficient of a resonant frequency. The at least one pair of electrodes interpose at least one of the first and second piezoelectric layers. The substrate supports the laminated structure and holds a portion of the laminated structure such that a suspended portion of the laminated structure vibrates in response to application of a voltage across the pair of electrodes.Type: GrantFiled: November 6, 2000Date of Patent: August 27, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Hidekazu Kitamura, Kazuhiro Inoue, Masaki Takeuchi
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Publication number: 20020093415Abstract: A laminated common-mode choke coil is disclosed in which the coupling characteristics of first and second coil electrodes are improved so as to reduce normal mode impedance. A first coil electrode and a second coil electrode are laminated across an insulating layer. The first coil electrode is formed in a spiral shape in an area from a first external electrode to a first through-hole electrode (point L). A second coil electrode is formed in a spiral shape in an area from a third external electrode to a second through--hole electrode (point K). Both coil electrodes are spirally overlapped with each other in an area from point B to point K. Three coil embodiments are also disclaosed.Type: ApplicationFiled: January 22, 2002Publication date: July 18, 2002Inventor: Hidekazu Kitamura
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Patent number: 6356181Abstract: A laminated common-mode choke coil is disclosed in which the coupling characteristics of first and second coil electrodes are improved so as to reduce normal mode impedance. A first coil electrode and a second coil electrode are laminated across an insulating layer. The first coil electrode is formed in a spiral shape in an area from a first external electrode to a first through-hole electrode (point L). A second coil electrode is formed in a spiral shape in an area from a third external electrode to a second through-hole electrode (point K). Both coil electrodes are spirally overlapped with each other in an area from point B to point K. Three coil embodiments are also disclosed.Type: GrantFiled: May 11, 1998Date of Patent: March 12, 2002Assignee: Murata Manufacturing Co., Ltd.Inventor: Hidekazu Kitamura
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Patent number: 6181232Abstract: A coil element includes a composite member located on a first magnetic substrate, a second magnetic substrate disposed on the composite member and an adhesive layer located therebetween. The composite member includes coil patterns and insulating layers. The adhesive layer is composed of a material having a relative magnetic permeability of more than about 1.0. Alternatively, the insulating layers, excluding a portion which surrounds an overlapping region of coil patterns, are composed of a material having a relative magnetic permeability of more than about 1.0. Alternatively, the insulating layers are provided with holes in the approximate central regions of the insulating layers surrounded by the coil patterns, and the holes are filled with the material of the adhesive layer.Type: GrantFiled: July 23, 1998Date of Patent: January 30, 2001Assignee: Murata Manufacturing Co., Ltd.Inventor: Hidekazu Kitamura