Patents by Inventor Toru Sakuragawa
Toru Sakuragawa 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: 11932263Abstract: A travel sickness estimation system includes an estimation unit and an output unit. The estimation unit is configured to perform estimation processing of estimating, based on person information indicating conditions of a person who is on board a moving vehicle, whether or not the person is in circumstances that would cause travel sickness for him or her. The output unit is configured to output a result of the estimation processing performed by the estimation unit.Type: GrantFiled: March 13, 2019Date of Patent: March 19, 2024Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Yuta Moriura, Yoshitaka Nakamura, Yasufumi Kawai, Hiroyuki Handa, Yohei Morishita, Toru Okino, Hiroyuki Hagino, Toru Sakuragawa, Satoshi Morishita
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Publication number: 20210031789Abstract: A travel sickness estimation system includes an estimation unit and an output unit. The estimation unit is configured to perform estimation processing of estimating, based on person information indicating conditions of a person who is on board a moving vehicle, whether or not the person is in circumstances that would cause travel sickness for him or her. The output unit is configured to output a result of the estimation processing performed by the estimation unit.Type: ApplicationFiled: March 13, 2019Publication date: February 4, 2021Inventors: Yuta MORIURA, Yoshitaka NAKAMURA, Yasufumi KAWAI, Hiroyuki HANDA, Yohei MORISHITA, Toru OKINO, Hiroyuki HAGINO, Toru SAKURAGAWA, Satoshi MORISHITA
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Patent number: 7138890Abstract: A SAW resonator includes an IDT electrode formed on a piezoelectric substrate and reflector electrodes disposed on both sides of the IDT electrode. The IDT electrode includes first finger-electrodes, second finger-electrodes and strip-line electrodes. The first and the second finger-electrodes do not overlap with each other but are acoustically coupled together by the strip-line electrodes. This acoustic coupling by the strip-line electrodes eliminates the need for a common bus-bar electrode, so that the loss caused by the resistance of the common bus-bar electrode can be reduced, and the SAW resonator can be downsized.Type: GrantFiled: February 21, 2006Date of Patent: November 21, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiroyuki Nakamura, Shunichi Seki, Kazunori Nishimura, Toru Sakuragawa
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Patent number: 7106150Abstract: A surface acoustic wave filter with little electromagnetic coupling between wires and improved attenuation characteristics is provided. This surface acoustic wave filter comprises: a package having a concavity in the shape of stairs made by laminating dielectrics, a surface acoustic wave element provided on the bottom face of the concavity, a plurality of wires for connecting between a plurality of electrodes provided on the surface of the surface acoustic wave element and a plurality of electrodes provided on one same plane portion of the stairs of the package in correspondence to a plurality of electrodes, and a dummy wire provided between the wires.Type: GrantFiled: September 14, 2004Date of Patent: September 12, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Koji Seo, Tetsuro Shimamura, Toru Sakuragawa, Hiroshi Kushanti, Yuki Satoh
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Publication number: 20060139126Abstract: A SAW resonator includes an IDT electrode formed on a piezoelectric substrate and reflector electrodes disposed on both sides of the IDT electrode. The IDT electrode includes first finger-electrodes, second finger-electrodes and strip-line electrodes. The first and the second finger-electrodes do not overlap with each other but are acoustically coupled together by the strip-line electrodes. This acoustic coupling by the strip-line electrodes eliminates the need for a common bus-bar electrode, so that the loss caused by the resistance of the common bus-bar electrode can be reduced, and the SAW resonator can be downsized.Type: ApplicationFiled: February 21, 2006Publication date: June 29, 2006Inventors: Hiroyuki Nakamura, Shunichi Seki, Kazunori Nishimura, Toru Sakuragawa
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Patent number: 7034634Abstract: A SAW resonator includes an IDT electrode formed on a piezoelectric substrate and reflector electrodes disposed on both sides of the IDT electrode. The IDT electrode includes first finger-electrodes, second finger-electrodes and strip-line electrodes. The first and the second finger-electrodes do not overlap with each other but are acoustically coupled together by the strip-line electrodes. This acoustic coupling by the strip-line electrodes eliminates the need for a common bus-bar electrode, so that the loss caused by the resistance of the common bus-bar electrode can be reduced, and the SAW resonator can be downsized.Type: GrantFiled: March 26, 2004Date of Patent: April 25, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiroyuki Nakamura, Shunichi Seki, Kazunori Nishimura, Toru Sakuragawa
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Patent number: 6909341Abstract: In a surface acoustic wave (SAW) filter including a substrate and an electrode formed on the substrate, the electrode includes a base layer, a first metal layer made of a metal consisting of Al or consisting mainly of Al, and having a given orientation relative to the substrate, a second layer for preventing the first metal layer from migration of Al atoms occurring in vertical to the substrate, and a third layer for adjusting a thickness of the layer. In this SAW filter having an arbitrary layer thickness, the layer hardly causes grain boundary diffusion, and grains of the layer can be made fine for effective resistance to stress. Thus, in this SAW filter, the migration of the Al atoms of the electrode that is associated with the SAW propagation-induced stress imposed on the electrode is inhibited. Accordingly, the filter exhibits excellent resistance against electric power.Type: GrantFiled: October 23, 2001Date of Patent: June 21, 2005Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Ryoichi Takayama, Hidekazu Nakanishi, Tetsuo Kawasaki, Toru Sakuragawa, Yasuhiko Yokota
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Patent number: 6891449Abstract: An antenna duplexer has a power durability to a signal input from an antenna terminal and has stable characteristics. The antenna duplexer includes an input terminal, a transmission filter including a surface acoustic wave (SAW) filter having an input port connected to the input terminal, a phase shifter having an input port connected to an output port of the transmission filter, a reception filter having an input port connected to an output port of the phase shifter, an output terminal connected to the output port of the reception filter, and an antenna terminal connected between the transmission filter and the phase shifter. The transmission filter has a power durability at the output port of the filter, being equal to or larger than a power durability at the input port of the filter.Type: GrantFiled: March 1, 2002Date of Patent: May 10, 2005Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Ryoichi Takayama, Tetsuo Kawasaki, Yuki Satoh, Kozo Murakami, Toru Sakuragawa
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Publication number: 20050062559Abstract: A surface acoustic wave filter with little electromagnetic coupling between wires and improved attenuation characteristics is provided. This surface acoustic wave filter comprises: a package having a concavity in the shape of stairs made by laminating dielectrics, a surface acoustic wave element provided on the bottom face of the concavity, a plurality of wires for connecting between a plurality of electrodes provided on the surface of the surface acoustic wave element and a plurality of electrodes provided on one same plane portion of the stairs of the package in correspondence to a plurality of electrodes, and a dummy wire provided between the wires.Type: ApplicationFiled: September 14, 2004Publication date: March 24, 2005Inventors: Koji Seo, Tetsuro Shimamura, Toru Sakuragawa, Hiroshi Kushitani, Yuki Satoh
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Publication number: 20040212450Abstract: A SAW resonator includes an IDT electrode formed on a piezoelectric substrate and reflector electrodes disposed on both sides of the IDT electrode. The IDT electrode includes first finger-electrodes, second finger-electrodes and strip-line electrodes. The first and the second finger-electrodes do not overlap with each other but are acoustically coupled together by the strip-line electrodes. This acoustic coupling by the strip-line electrodes eliminates the need for a common bus-bar electrode, so that the loss caused by the resistance of the common bus-bar electrode can be reduced, and the SAW resonator can be downsized.Type: ApplicationFiled: March 26, 2004Publication date: October 28, 2004Inventors: Hiroyuki Nakamura, Shunichi Seki, Kazunori Nishimura, Toru Sakuragawa
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Patent number: 6759924Abstract: A small-sized multi-frequency antenna duplexer using surface acoustic wave filters to be applicable to a plurality of frequencies. This antenna duplexer includes two surface acoustic wave (SAW) filters for transmission and reception having passing bands of mutually different frequencies, a phase shift substrate, and a package for accommodating them. The passing band of each antenna duplexer is mutually different from other's passing band. This multi-frequency antenna duplexer includes a plurality of antenna duplexers. In one package, transmitter surface acoustic wave filters, receiver surface acoustic filters, and phase shift substrates are mounted. Thus, the multi-frequency antenna duplexer are reduced in size.Type: GrantFiled: June 14, 2002Date of Patent: July 6, 2004Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Toru Sakuragawa, Yuki Satoh, Kozo Murakami, Ryoichi Takayama
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Patent number: 6714098Abstract: An antenna duplexer capable of optimally decreasing the insertion loss and the voltage standing wave ratio (VSWR) at a center frequency and its vicinity in the pass band in transmitter-band of the device. The output port of transmitter surface-acoustic-wave (SAW) filter (11) is electrically connected with phase shift circuit (13), to which receiver SAW filter (12) is also electrically connected. The transmitter and receiver SAW filters have different pass bands and attenuate the other pass band with each other. Phase shift circuit (13) shifts the phase of receiver SAW filter (12) in the transmitter-band. In addition, phase shift circuit (13) has the characteristic impedance in which the magnitude of the reflection coefficient at the center frequency in the transmitter-band of receiver SAW filter (12) is to be not less than 0.8 and the phase angle of reflection coefficient at the center frequency in the transmitter-band of receiver SAW filter (12) takes the range from 0° to 45°.Type: GrantFiled: October 19, 2001Date of Patent: March 30, 2004Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Kazushi Nishida, Katsuya Fujii, Ichiro Kameyama, Toru Sakuragawa, Hiroshi Fujinaka
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Publication number: 20030174028Abstract: In a surface acoustic wave (SAW) filter including a substrate and an electrode formed on the substrate, the electrode includes a base layer, a first metal layer made of a metal consisting of Al or consisting mainly of Al, and having a given orientation relative to the substrate, a second layer for preventing the first metal layer from migration of Al atoms occurring in vertical to the substrate, and a third layer for adjusting a thickness of the layer. In this SAW filter having an arbitrary layer thickness, the layer hardly causes grain boundary diffusion, and grains of the layer can be made fine for effective resistance to stress. Thus, in this SAW filter, the migration of the Al atoms of the electrode that is associated with the SAW propagation-induced stress imposed on the electrode is inhibited. Accordingly, the filter exhibits excellent resistance against electric power.Type: ApplicationFiled: October 8, 2002Publication date: September 18, 2003Inventors: Ryoichi Takayama, Hidekazu Nakanishi, Tetsuo Kawasaki, Toru Sakuragawa, Yasuhiko Yokota
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Publication number: 20030137364Abstract: An antenna duplexer capable of optimally decreasing the insertion loss and the voltage standing wave ratio (VSWR) at a center frequency and its vicinity in the pass band in transmitter-band of the device. The output port of transmitter surface-acoustic-wave (SAW) filter (11) is electrically connected with phase shift circuit (13), to which receiver SAW filter (12) is also electrically connected. The transmitter and receiver SAW filters have different pass bands and attenuate the other pass band with each other. Phase shift circuit (13) shifts the phase of receiver SAW filter (12) in the transmitter-band. In addition, phase shift circuit (13) has the characteristic impedance in which the magnitude of the reflection coefficient at the center frequency in the transmitter-band of receiver SAW filter (12) is to be not less than 0.8 and the phase angle of reflection coefficient at the center frequency in the transmitter-band of receiver SAW filter (12) takes the range from 0° to 45°.Type: ApplicationFiled: October 19, 2001Publication date: July 24, 2003Inventors: Kazushi Nishida, Katsuya Fujii, Ichiro Kameyama, Toru Sakuragawa, Hiroshi Fujinaka
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Publication number: 20020186097Abstract: A small-size multi-frequency antenna duplexer using surface acoustic wave filters and capable of dealing with a plurality of frequencies. Each antenna duplexer comprises two surface acoustic wave (SAW) filters used for transmission and reception, respectively, and having different frequency pass bands; a phase substrate; and a package housing the foregoing filters and substrate. The pass bands of the antenna duplexers are different from one another. This multi-frequency antenna duplexer comprises a plurality of antenna duplexers. A respective package (14) contains a transmitting surface acoustic wave filter (11a, 11b), a receiving surface acoustic wave filter (12a, 12b) and a phase substrate (13a, 13b). In this way, the size of multi-frequency antenna duplexer can be reduced.Type: ApplicationFiled: June 14, 2002Publication date: December 12, 2002Inventors: Toru Sakuragawa, Yuki Satoh, Kozo Murakami, Ryoichi Takayama
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Band switching filter using a surface acoustic wave resonator and an antenna duplexer using the same
Patent number: 6472953Abstract: A band switching filter includes a resonator circuit having a surface acoustic wave resonator, a switching element and an impedance element. The filter selectively passes or attenuates a signal through one of two pass bands using a single filter. The resonant frequency of the resonator circuit can be shifted to another frequency by selectively connecting the surface acoustic wave resonator to an impedance element using a switching element.Type: GrantFiled: March 10, 2000Date of Patent: October 29, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Toru Sakuragawa, Yuki Sato, Katsuya Fujii, Kozo Murakami, Ryoichi Takayama -
Publication number: 20020140519Abstract: An antenna duplexer has a power durability to a signal input from an antenna terminal and has stable characteristics. The antenna duplexer includes an input terminal, a transmission filter including a surface acoustic wave (SAW) filter having an input port connected to the input terminal, a phase shifter having an input port connected to an output port of the transmission filter, a reception filter having an input port connected to an output port of the phase shifter, an output terminal connected to the output port of the reception filter, and an antenna terminal connected between the transmission filter and the phase shifter. The transmission filter has a power durability at the input terminal, being equal to or larger than a power durability at the antenna terminal.Type: ApplicationFiled: March 1, 2002Publication date: October 3, 2002Inventors: Ryoichi Takayama, Tetsuo Kawasaki, Yuki Satoh, Kozo Murakami, Toru Sakuragawa
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Patent number: 6445261Abstract: The invention relates to a SAW filter, an antenna duplexer using the same, and a mobile communication terminal using the same, and assures a high withstanding power characteristic and a sufficient isolation between transmitting terminal and receiving terminal. The invention relates to a ladder-type SAW filter composed by alternately connecting a serial branch having at least one SAW resonator connected in series to a signal path, and a parallel branch having at least one SAW resonator connected between the signal path and the ground, in which the sizes of wiring patterns of the parallel branch are smaller than wiring patterns of the serial branch. Therefore, in the case of the serial-branch input type, inductive components of the parallel-branch wiring patterns can be decreased, so that a large reflection coefficient may be obtained in the rejection band.Type: GrantFiled: April 13, 2000Date of Patent: September 3, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Naoki Yuda, Toru Sakuragawa, Ryouichi Takayama, Kozo Murakami, Yuki Satoh
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Patent number: 6404302Abstract: The present invention relates to a surface acoustic wave (SAW) filter which is used for cellular phones and other mobile communication equipment. The object of the present invention is to realize a SAW filter of which attenuation characteristics and pass characteristics can be set arbitrarily. The SAW filter of the present invention comprises comb-shaped electrodes facing each other disposed on the same piezoelectric substrate, at least two resonators with an input and output terminals, and an equivalent transmission line which is connected between an output terminal of a first resonator and an input terminal of a second resonator. The phase of the transmission line can be adjusted from 5 degrees to 175 degrees arbitrarily at the series resonance frequency of the resonators. This structure realizes a band-stop filter or a band-pass filter whose attenuation characteristics and pass characteristics can be set arbitrarily.Type: GrantFiled: September 5, 2000Date of Patent: June 11, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yuki Satoh, Toru Sakuragawa, Kozo Murakami
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Patent number: 6310422Abstract: The present invention relates to a surface acoustic wave filter used in frequency filter of portable telephone and other mobile communication device, and is intended to realize a surface acoustic wave filter capable of obtaining a stable filter characteristic even in the event of input of a large signal. The invention includes resonators (5) to (8) formed on a piezoelectric substrate (3), through-holes (12) provided near the resonators (5) to (8), and a conductive material (13) filling up the through-holes (12), in which the through-holes (12) filled up with the conductive material (13) are electrically grounded. In this constitution, by the through-holes (12) provided near the resonators (5) to (8) and filled up with the conductive material (13), the heat generated in the resonators (5) to (8) when a large signal is applied to the input terminal (1) can be released, so that a stable filter characteristic may be maintained if a large signal is applied.Type: GrantFiled: February 28, 2000Date of Patent: October 30, 2001Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yuki Satoh, Toru Sakuragawa, Mitsuhiro Furukawa, Ryouichi Takayama