Patents by Inventor Takuma Kuzushita
Takuma Kuzushita 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: 11863161Abstract: An acoustic wave filter includes a first resonance circuit including a first series arm resonator and a first capacitive element. The first series arm resonator is provided on a path connecting a first terminal and a second terminal. The first capacitive element is coupled in parallel with the first series arm resonator. The first series arm resonator includes a first divided resonator and a second divided resonator coupled in series with each other. The first resonance circuit includes a second resonance circuit including the first divided resonator and a second capacitive element coupled in parallel with the first divided resonator.Type: GrantFiled: December 1, 2020Date of Patent: January 2, 2024Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Tetsu Takahashi, Toru Yamaji, Takuma Kuzushita
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Publication number: 20210203306Abstract: An acoustic wave filter includes a first resonance circuit including a first series arm resonator and a first capacitive element. The first series arm resonator is provided on a path connecting a first terminal and a second terminal. The first capacitive element is coupled in parallel with the first series arm resonator. The first series arm resonator includes a first divided resonator and a second divided resonator coupled in series with each other. The first resonance circuit includes a second resonance circuit including the first divided resonator and a second capacitive element coupled in parallel with the first divided resonator.Type: ApplicationFiled: December 1, 2020Publication date: July 1, 2021Inventors: Tetsu TAKAHASHI, Toru YAMAJI, Takuma KUZUSHITA
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Patent number: 10177740Abstract: A ladder filter includes a piezoelectric substrate, an insulating film on the piezoelectric substrate, first and second electrodes provided on the piezoelectric substrate and including a pair of busbars and plurality of electrode fingers, a first line electrode at least a portion of which is defined by the busbar at one side of the first electrode, a second line electrode at least a portion of which is defined by the busbar at one side of the second electrode, and a third line electrode laminated on the second line electrode. The first line electrode and the second line electrode are electrically connected to different electric potentials. The first line electrode is separated from the second line electrode by a predetermined distance. At least a portion of the third line electrode is overlapped with at least a portion of the first line electrode with the insulating film interposed therebetween in a laminating direction.Type: GrantFiled: March 24, 2017Date of Patent: January 8, 2019Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Akira Michigami, Koichiro Kawasaki, Takuma Kuzushita
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Patent number: 10090823Abstract: An elastic wave resonator includes series divided resonators on a piezoelectric substrate, first and second outer busbars, a first interstage busbar, first to fourth electrode fingers and first and second dummy electrode fingers. Third dummy electrode fingers are not provided at at least one of a side where the second electrode fingers are provided and a side where the third electrode fingers are provided or third dummy electrode fingers having a length smaller than lengths of the first and second dummy electrode fingers are provided at at least one of a side where the second electrode fingers are provided and a side where the third electrode fingers are provided. The third electrode fingers are arranged on an extension to which the second electrode fingers extend.Type: GrantFiled: March 28, 2017Date of Patent: October 2, 2018Assignee: Murata Manufacturing Co., Ltd.Inventor: Takuma Kuzushita
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Publication number: 20170201228Abstract: An elastic wave resonator includes series divided resonators on a piezoelectric substrate, first and second outer busbars, a first interstage busbar, first to fourth electrode fingers and first and second dummy electrode fingers. Third dummy electrode fingers are not provided at at least one of a side where the second electrode fingers are provided and a side where the third electrode fingers are provided or third dummy electrode fingers having a length smaller than lengths of the first and second dummy electrode fingers are provided at at least one of a side where the second electrode fingers are provided and a side where the third electrode fingers are provided. The third electrode fingers are arranged on an extension to which the second electrode fingers extend.Type: ApplicationFiled: March 28, 2017Publication date: July 13, 2017Inventor: Takuma KUZUSHITA
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Publication number: 20170194938Abstract: A ladder filter includes a piezoelectric substrate, an insulating film on the piezoelectric substrate, first and second electrodes provided on the piezoelectric substrate and including a pair of busbars and plurality of electrode fingers, a first line electrode at least a portion of which is defined by the busbar at one side of the first electrode, a second line electrode at least a portion of which is defined by the busbar at one side of the second electrode, and a third line electrode laminated on the second line electrode. The first line electrode and the second line electrode are electrically connected to different electric potentials. The first line electrode is separated from the second line electrode by a predetermined distance. At least a portion of the third line electrode is overlapped with at least a portion of the first line electrode with the insulating film interposed therebetween in a laminating direction.Type: ApplicationFiled: March 24, 2017Publication date: July 6, 2017Inventors: Akira MICHIGAMI, Koichiro KAWASAKI, Takuma KUZUSHITA
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Patent number: 9455682Abstract: In an elastic wave filter device, an elastic wave filter element chip is mounted on a board. In the elastic wave filter element chip, a ladder filter including a plurality of series arm resonators and a plurality of parallel arm resonators are provided. In/on the board, a first inductor connected in parallel to the series arm resonator and a second inductor connected between the parallel arm resonators P1-P3 and a ground potential are provided. In/on the board, a shield electrode is located between the first inductor and the second inductor.Type: GrantFiled: February 6, 2015Date of Patent: September 27, 2016Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Takuma Kuzushita, Yasumasa Taniguchi, Takashi Miyake
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Publication number: 20150155850Abstract: In an elastic wave filter device, an elastic wave filter element chip is mounted on a board. In the elastic wave filter element chip, a ladder filter including a plurality of series arm resonators and a plurality of parallel arm resonators are provided. In/on the board, a first inductor connected in parallel to the series arm resonator and a second inductor connected between the parallel arm resonators P1-P3 and a ground potential are provided. In/on the board, a shield electrode is located between the first inductor and the second inductor.Type: ApplicationFiled: February 6, 2015Publication date: June 4, 2015Applicant: MURATA MANUFACTURING CO., LTD.Inventors: Takuma KUZUSHITA, Yasumasa TANIGUCHI, Takashi MIYAKE
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Patent number: 8710940Abstract: An elastic wave device includes a piezoelectric substrate, an IDT electrode located on the piezoelectric substrate, and a capacitive electrode that is located on the piezoelectric substrate and is connected in series with the IDT electrode. The capacitive electrode includes a plurality of capacitive electrode portions, each of which includes a pair of mutually interdigitated comb-shaped electrodes. The plurality of capacitive electrode portions are connected with each other in parallel. The plurality of capacitive electrode portions are arranged such that an intersecting width direction D1 of the capacitive electrode portions is inclined with respect to an intersecting width direction D2 of the IDT electrode. The plurality of capacitive electrode portions are arrayed in an elastic-wave propagating direction D3 of the IDT electrode.Type: GrantFiled: September 28, 2012Date of Patent: April 29, 2014Assignee: Murata Manufacturing Co., Ltd.Inventors: Shinichi Sogoya, Tetsuro Okuda, Takuma Kuzushita