Patents by Inventor Kuniyuki Matsui
Kuniyuki Matsui 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: 6037699Abstract: The invention provides a surface acoustic wave device which has a thin film formed on a surface of a substrate adapted to excite longitudinal wave-type surface acoustic waves, longitudinal wave-type quasi surface acoustic waves or longitudinal wave-type surface skimming bulk waves to thereby give an increased electromechanical coupling coefficient and at the same time minimize the temperature coefficient of delay time. For example, in a surface acoustic wave device having an aluminum thin film formed on a surface of a lithium tantalate substrate, the direction of propagation of longitudinal wave-type quasi surface acoustic waves is (40 deg to 90 deg, 40 deg to 90 deg, 0 deg to 60 deg) as expressed in Eulerian angles and within a range equivalent thereto, and the product of wave number of longitudinal wave-type quasi surface acoustic waves and the thickness of the thin film is at least 1.0, preferably in the range of 1.3 to 2.0. The device provided exhibits higher performance than in the paior art.Type: GrantFiled: January 9, 1998Date of Patent: March 14, 2000Assignees: Sanyo Electric Co., Ltd., Yasutaka ShimizuInventors: Yasumi Kobayashi, Kuniyuki Matsui, Yasuhiro Hirao, Kosuke Takeuchi, Kenichi Shibata, Yusuke Takahashi, Tateo Kondo, Yasutaka Shimizu
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Patent number: 6034577Abstract: A surface acoustic wave filter having one or a plurality of filter functional units each comprising a series arm resonator and a parallel arm resonator. Each of the series arm resonator and the parallel arm resonator is constituted by an interdigital transducer and grating reflectors formed on a piezoelectric substrate composed of 64.degree.-rotated Y-cut X-propagating LiNbO.sub.3. The series arm resonator is constructed by electrically connecting a one-port resonator in series with a signal line, and the parallel arm resonator is constructed by electrically connecting a one-port resonator in parallel with the signal line. In the interdigital transducer in the series arm resonator and/or the parallel arm resonator, one or more sets of electrode fingers continuously adjacent to each other are formed.Type: GrantFiled: September 22, 1998Date of Patent: March 7, 2000Assignee: Sanyo Electric Co., Ltd.Inventors: Kuniyuki Matsui, Yasuhiro Hirao, Yasumi Kobayashi, Kousuke Takeuchi, Kenichi Shibata
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Patent number: 5914645Abstract: In a surface acoustic wave device comprising a substrate of lithium tantalate or lithium niobate, and interdigital electrodes formed on the substrate and made of a thin film consisting primarily of aluminum, the interdigital electrodes are optimized in the ratio of the thickness of the film to the period of a plurality of electrode digits connected to a common terminal with propagation loss taken as an objective function. The ratio is set in the range of 0.03 to 0.10 to ensure a lower propagation loss than in the prior art.Type: GrantFiled: June 4, 1997Date of Patent: June 22, 1999Assignee: Sanyo Electric Co., Ltd.Inventors: Yasumi Kobayashi, Kuniyuki Matsui, Naoki Tanaka, Hiroshi Okano, Tatsuro Usuki, Kenichi Shibata
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Patent number: 5877662Abstract: A surface acoustic wave filter according to the present invention is constructed by connecting in series one or two or more filter functional units each comprising a first surface acoustic wave resonator having input and output terminals connected in series with a signal line and a second surface acoustic wave resonator having input and output terminals one of which is connected to the signal line and the other of which is grounded. The first surface acoustic wave resonator is constituted by one interdigital transducer and a pair of electrically open strip type grating reflectors with the interdigital transducer interposed therebetween, and the second surface acoustic wave resonator is constituted by one interdigital transducer and a pair of electrically short strip type grating reflectors with the interdigital transducer interposed therebetween.Type: GrantFiled: April 19, 1996Date of Patent: March 2, 1999Assignee: Sanyo Electric Co., Ltd.Inventors: Yasumi Kobayashi, Kuniyuki Matsui, Yasuhiro Hirao, Kousuke Takeuchi, Hiroshi Kayaki, Yusuke Takahashi, Toshiharu Tanaka, Isao Kiyose, Kenichi Shibata
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Patent number: 5844453Abstract: A surface acoustic wave filter according to the present invention has one or a plurality of filter functional units each comprising a series arm resonator and a parallel arm resonator. Each of the series arm resonator and the parallel arm resonator is constituted by a interdigital transducer and grating reflectors formed on a piezoelectric substrate composed of 64.degree.-rotated Y-cut X-propagating LiNbO.sub.3. The series arm resonator is constructed by electrically connecting a one-port resonator in series with a signal line, and the parallel arm resonator is constructed by electrically connecting a one-port resonator in parallel with the signal line. In the interdigital transducer in the series arm resonator and/or the parallel arm resonator, one or more sets of electrode fingers continuously adjacent to each other are formed.Type: GrantFiled: May 29, 1996Date of Patent: December 1, 1998Assignee: Sanyo Electric Co., Ltd.Inventors: Kuniyuki Matsui, Yasuhiro Hirao, Yasumi Kobayashi, Kousuke Takeuchi, Kenichi Shibata
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Patent number: 5808523Abstract: A high-frequency filter having series and parallel electrode patterns formed on a mount substrate, surface acoustic wave resonators connected to a signal input/output line of the electrode patterns in series, and coaxial dielectric resonators having respective one input/output terminals connected to the signal input/output line and the other input/output terminals connected to a ground element. In such a composite high-frequency filter, the surface acoustic wave resonators form the resonators in the serial arms while the coaxial dielectric resonators form resonators in the parallel arms. The high-frequency filter can meet all the requirements of enhanced miniaturization, selectivity and power handling.Type: GrantFiled: October 28, 1997Date of Patent: September 15, 1998Assignee: Sanyo Electric Co., Ltd.Inventors: Yasumi Kobayashi, Kuniyuki Matsui, Yasuhiro Hirao, Kousuke Takeuchi, Kenichi Shibata
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Patent number: 5760522Abstract: The invention provides a surface acoustic wave device which has a thin film formed on a surface of a substrate adapted to excite longitudinal wave-type surface acoustic waves, longitudinal wave-type quasi surface acoustic waves or longitudinal wave-type surface skimming bulk waves to thereby give an increased electromechanical coupling coefficient and at the same time minimize the temperature coefficient of delay time. For example, in a surface acoustic wave device having an aluminum thin film formed on a surface of a lithium tantalate substrate, the direction of propagation of longitudinal wave-type quasi surface acoustic waves is (40 deg to 90 deg, 40 deg to 90 deg, 0 deg to 60 deg) as expressed in Eulerian angles and within a range equivalent thereto, and the product of wave number of longitudinal wave-type quasi surface acoustic waves and the thickness of the thin film is at least 1.0, preferably in the range of 1.3 to 2.0. The device provided exhibits higher performance than in the paior art.Type: GrantFiled: April 9, 1996Date of Patent: June 2, 1998Assignees: Sanyo Electric Co., Ltd., Yasutaka ShimizuInventors: Yasumi Kobayashi, Kuniyuki Matsui, Yasuhiro Hirao, Kosuke Takeuchi, Kenichi Shibata, Yusuke Takahashi, Tateo Kondo, Yasutaka Shimizu
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Patent number: 5719537Abstract: In a resonator-type surface acoustic wave filter comprising a lithium tantalate substrate, lithium niobate substrate or lithium tetraborate substrate having a cut plane of high velocity, the direction of propagation of surface acoustic waves is set within the range of (40 deg to 90 deg, 40 deg to 90 deg, 0 deg to 60 deg) as expressed in Eulerian angles, and the frequency difference .increment.f between the resonance frequency frs of series resonators and the resonance frequency frp of parallel resonators is set within a predetermined range formulated with the center frequency, the capacitance Cos of the series resonators and the capacitance Cop of the parallel resonators taken as parameters. Optimum ranges of the required design parameters are thus clarified to assure the resonator-type surface acoustic wave filter of higher performance.Type: GrantFiled: April 9, 1996Date of Patent: February 17, 1998Assignees: Sanyo Electric Co., Ltd., Yasutaka ShimizuInventors: Kuniyuki Matsui, Yasuhiro Hirao, Yasumi Kobayashi, Kosuke Takeuchi, Kenichi Shibata, Masami Ikeda, Toshiharu Tanaka, Yasutaka Shimizu
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Patent number: 5719536Abstract: In a resonator-type surface acoustic wave filter comprising a lithium tantalate substrate, lithium niobate substrate or lithium tetraborate substrate having a cut plane of high velocity, the direction of propagation of surface acoustic waves is set within the range of (40 deg to 90 deg, 40 deg to 90 deg, 0 deg to 60 deg) as expressed in Eulerian angles, and the capacitance Cos of the series resonators and the capacitance Cop of the parallel resonators are set within a predetermined range formulated with the center frequency taken as a parameter. Optimum ranges of the required design parameters are thus clarified to assure the resonator-type surface acoustic wave filter of higher performance.Type: GrantFiled: April 9, 1996Date of Patent: February 17, 1998Assignees: Sanyo Electric Co., Ltd., Yasutaka ShimizuInventors: Kuniyuki Matsui, Yasuhiro Hirao, Yasumi Kobayashi, Kosuke Takeuchi, Kenichi Shibata, Yusuke Takahashi, Tateo Kondo, Yasutaka Shimizu
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Patent number: 5675207Abstract: A surface acoustic wave convolver of the present invention includes, on a surface of a piezoelectric substrate, a pair of comb-like surface acoustic wave excitation electrodes 2 and 3, and a center electrode 4. The excitation electrodes 2 and 3 are disposed opposed to each other at a specified interval while the center electrode 4 having a shorter width than a length of the excitation electrodes 2 and 3 is positioned between the electrodes 2 and 3. The center electrode 4 propagates the surface acoustic waves respectively produced by the excitation electrodes 2 and 3 in reverse directions to each other to obtain a convolution output signal. A pair of reflectors 10 are positioned on opposite sides of a region defined between the excitation electrode 2 and one end of the center electrode 4 with a width equivalent to that of the center electrode 4.Type: GrantFiled: May 22, 1996Date of Patent: October 7, 1997Assignee: Sanyo Electric Co., Ltd.Inventors: Yasuhiro Hirao, Kuniyuki Matsui, Yasumi Kobayashi, Kousuke Takeuchi, Kenichi Shibata
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Patent number: 5663697Abstract: A surface acoustic wave filter according to the present invention is constructed by connecting in series one or two or more filter functional units each comprising a first surface acoustic wave resonator having input and output terminals connected in series with a signal line and a second surface acoustic wave resonator having input and output terminals one of which is connected to the signal line and the other of which is grounded. The first surface acoustic wave resonator is constituted by one interdigital transducer and a pair of electrically open strip type grating reflectors with the interdigital transducer interposed therebetween, and the second surface acoustic wave resonator is constituted by one interdigital transducer and a pair of electrically short strip type grating reflectors with the interdigital transducer interposed therebetween.Type: GrantFiled: April 22, 1996Date of Patent: September 2, 1997Assignee: Sanyo Electric Co., Ltd.Inventors: Yasumi Kobayashi, Kuniyuki Matsui, Yasuhiro Hirao, Kousuke Takeuchi, Hiroshi Kayaki, Yusuke Takahashi, Toshiharu Tanaka, Isao Kiyose, Kenichi Shibata
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Patent number: 5543757Abstract: A surface acoustic wave filter according to the present invention is constructed by connecting in series one or two or more filter functional units each comprising a first surface acoustic wave resonator having input and output terminals connected in series with a signal line and a second surface acoustic wave resonator having input and output terminals one of which is connected to the signal line and the other of which is grounded. The first surface acoustic wave resonator is constituted by one interdigital transducer and a pair of electrically open strip type grating reflectors with the interdigital transducer interposed therebetween, and the second surface acoustic wave resonator is constituted by one interdigital transducer and a pair of electrically short strip type grating reflectors with the interdigital transducer interposed therebetween.Type: GrantFiled: September 6, 1994Date of Patent: August 6, 1996Assignee: Sanyo Electric Co., Ltd.Inventors: Yasumi Kobayashi, Kuniyuki Matsui, Yasuhiro Hirao, Kousuke Takeuchi, Hiroshi Kayaki, Yusuke Takahashi, Toshiharu Tanaka, Isao Kiyose, Kenichi Shibata