Patents by Inventor Masahiko Hirao
Masahiko Hirao 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: 9872260Abstract: A power adjustment method includes: measuring output power that is obtained when input power to be amplified in a linear region is input to a power amplifier configured to amplify input power linearly in the linear region and amplify input power nonlinearly in a nonlinear region; deriving a straight line connecting a measurement point corresponding to the measured output power and a boundary point between the linear region and the nonlinear region in a coordinate plane representing input/output characteristics; acquiring information on an approximate equation that is stored in advance in correspondence with the measured output power, the approximate equation representing a relation between input power and output power in the nonlinear region; and storing information on the derived straight line and the acquired information on the approximate equation in a semiconductor integrated circuit provided at a preceding stage of the power amplifier.Type: GrantFiled: May 29, 2016Date of Patent: January 16, 2018Assignee: FUJITSU LIMITEDInventors: Nobuhide Hachiya, Takashi Tanii, Yasuhiro Murakami, Yusuke Yamamori, Yasuaki Takeuchi, Masahiko Hirao, Manabu Murakami, Mikio Hayashihara
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Publication number: 20160278028Abstract: A power adjustment method includes: measuring output power that is obtained when input power to be amplified in a linear region is input to a power amplifier configured to amplify input power linearly in the linear region and amplify input power nonlinearly in a nonlinear region; deriving a straight line connecting a measurement point corresponding to the measured output power and a boundary point between the linear region and the nonlinear region in a coordinate plane representing input/output characteristics; acquiring information on an approximate equation that is stored in advance in correspondence with the measured output power, the approximate equation representing a relation between input power and output power in the nonlinear region; and storing information on the derived straight line and the acquired information on the approximate equation in a semiconductor integrated circuit provided at a preceding stage of the power amplifier.Type: ApplicationFiled: May 29, 2016Publication date: September 22, 2016Applicant: FUJITSU LIMITEDInventors: NOBUHIDE HACHIYA, TAKASHI TANII, YASUHIRO MURAKAMI, Yusuke Yamamori, YASUAKI TAKEUCHI, MASAHIKO HIRAO, MANABU MURAKAMI, Mikio Hayashihara
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Patent number: 9130522Abstract: A first signal path has one or a plurality of coils arranged in series, the coils being connected to the output of a first amplifier. A second signal path has the same number of coils as the coils of the first signal path, the coils being arranged in series and connected to the output of a second amplifier. Coupling paths have capacitors and couple the first signal path and the second signal path at both ends of the corresponding coils on the first signal path and the second signal path. A SW controlling unit switches a switch to a contact when a signal is input from the first amplifier and switches the switch to a contact when a signal is input from the second amplifier.Type: GrantFiled: July 30, 2013Date of Patent: September 8, 2015Assignee: FUJITSU LIMITEDInventors: Kazushige Kishigami, Kenji Iwai, Atsushi Kudo, Nobuhide Hachiya, Masahiko Hirao
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Publication number: 20130316663Abstract: A first signal path has one or a plurality of coils arranged in series, the coils being connected to the output of a first amplifier. A second signal path has the same number of coils as the coils of the first signal path, the coils being arranged in series and connected to the output of a second amplifier. Coupling paths have capacitors and couple the first signal path and the second signal path at both ends of the corresponding coils on the first signal path and the second signal path. A SW controlling unit switches a switch to a contact when a signal is input from the first amplifier and switches the switch to a contact when a signal is input from the second amplifier.Type: ApplicationFiled: July 30, 2013Publication date: November 28, 2013Applicant: FUJITSU LIMITEDInventors: KAZUSHIGE KISHIGAMI, Kenji IWAI, ATSUSHI KUDO, NOBUHIDE HACHIYA, MASAHIKO HIRAO
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Patent number: 8478334Abstract: A first casing and a second casing movably connected to the first casing are provided. PAs amplify a transmit signal. FET switches are provided between the ground and respective transmission paths connecting the PAs and an antenna. When an intermediate voltage is applied, the FET switch has a capacitance according to the applied intermediate voltage. An open or close detection unit acquires the impedance of the antenna corresponding to the positional relationship of the first casing and the second casing. A control unit turns one of a plurality of switches ON and applies the intermediate voltage to the FET switches to achieve a capacitance whereby the impedance of the PA arranged on the transmission path where the switch is ON and the impedance of the antenna are matched based on the impedance of the antenna acquired by the open or close detection unit.Type: GrantFiled: January 20, 2012Date of Patent: July 2, 2013Assignee: Fujitsu LimitedInventors: Kenji Iwai, Kazushige Kishigami, Atsushi Kudou, Masahiko Hirao, Nobuhide Hachiya
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Patent number: 8438912Abstract: A detection device (10) includes: covers (1-3); an oscillator (4); antennas (9, 11, 12), a testing space (13), and a minute space (14). The testing space (13) and minute space (14) are formed in the covers (1-3). The minute space (14) is open to the testing space (13). The oscillator (4) is disposed in the testing space (13) such that its edge portions are inserted into the minute space (14). The antenna (9) works together with the antenna (12) to apply an electromagnetic field to the oscillator (4). The antenna (11) works together with the antenna (12) to receive a reception signal composed of a vibration signal from the oscillator (4).Type: GrantFiled: December 9, 2010Date of Patent: May 14, 2013Assignee: Japan Science and Technology AgencyInventors: Hirotsugu Ogi, Fumihito Kato, Masahiko Hirao
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Publication number: 20120318052Abstract: A detection device (10) includes: covers (1-3); an oscillator (4); antennas (9, 11, 12), a testing space (13), and a minute space (14). The testing space (13) and minute space (14) are formed in the covers (1-3). The minute space (14) is open to the testing space (13). The oscillator (4) is disposed in the testing space (13) such that its edge portions are inserted into the minute space (14). The antenna (9) works together with the antenna (12) to apply an electromagnetic field to the oscillator (4). The antenna (11) works together with the antenna (12) to receive a reception signal composed of a vibration signal from the oscillator (4).Type: ApplicationFiled: December 9, 2010Publication date: December 20, 2012Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCYInventors: Hirotsugu Ogi, Fumihito Kato, Masahiko Hirao
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Publication number: 20120238224Abstract: A first casing and a second casing movably connected to the first casing are provided. PAs amplify a transmit signal. FET switches are provided between the ground and respective transmission paths connecting the PAs and an antenna. When an intermediate voltage is applied, the FET switch has a capacitance according to the applied intermediate voltage. An open or close detection unit acquires the impedance of the antenna corresponding to the positional relationship of the first casing and the second casing. A control unit turns one of a plurality of switches ON and applies the intermediate voltage to the FET switches to achieve a capacitance whereby the impedance of the PA arranged on the transmission path where the switch is ON and the impedance of the antenna are matched based on the impedance of the antenna acquired by the open or close detection unit.Type: ApplicationFiled: January 20, 2012Publication date: September 20, 2012Applicant: FUJITSU LIMITEDInventors: Kenji Iwai, Kazushige Kishigami, Atsushi Kudou, Masahiko Hirao, Nobuhide Hachiya
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Patent number: 6109108Abstract: An electromagnetic acoustic transducer is provided which includes magnets and a sheet type coil unit. The magnets are permanent magnets or electromagnets to provide a static magnetic field to an object to be inspected. The coil unit includes a pair of spiral or meander coils of an electrically conductive material, sandwiched between upper and middle insulation sheet and middle and lower insulation sheet. The coils are used for transmission and reception, respectively. All the ends of the respective coils extend through throughholes formed through the upper and middle insulation sheets to the surface of the ultrasonic transducer, and are connected to external leads. The ends for earth are commonly connected to form a common ground terminal. The inspection system with the electromagnetic acoustic resonance which is a combination of resonant technique and a non-contact electromagnetic acoustic transducer can accomplish evaluating the absolute value of ultrasonic attenuation.Type: GrantFiled: September 29, 1997Date of Patent: August 29, 2000Assignee: Ebara CorporationInventors: Toshihiro Ohtani, Hirotsugu Ogi, Masahiko Hirao
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Patent number: 6038925Abstract: A focusing electromagnetic acoustic transducer is provided which comprises a pair of meander coils, three insulation sheets and a magnet. The meander coils are formed on both surfaces of one of the insulation sheets to be positioned such that the meander coils are coincident with each other, and they are covered with the other insulation sheets. Each of the meander coils comprises a plurality of coil segments wherein intervals between adjacent coil segments sequentially are varied from one end to the other end. The magnet is positioned above the layers consisting the meander coils and insulation sheets. The coil segments of each meander coil are straight lines in parallel with each others, sector shapes on respective circulars having the same center point, or generally circular shapes having the same center point.Type: GrantFiled: March 20, 1998Date of Patent: March 21, 2000Assignee: Ebara CorporationInventors: Toshihiro Ohtani, Hirotsugu Ogi, Masahiko Hirao
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Patent number: 5963731Abstract: Each of a plurality of simulation programs is linked with a data conversion library and is executed as a simulation process. A data conversion process is executed in correspondence with each simulation process. In exchanging data resulted from simulation by the simulation process of one of the simulation programs with simulation processes of the other simulation programs, the data conversion process provided for a sending simulation process determines a receiving simulation process to which the data is to be sent, and sends the data to the data conversion process corresponding to the receiving simulation process. The data conversion process for the receiving simulation process performs data conversion for absorbing difference between the base of the sending simulation process and the base of the receiving simulation process, and transfers the data after the conversion to the receiving simulation process.Type: GrantFiled: December 24, 1996Date of Patent: October 5, 1999Assignee: Hitachi, Ltd.Inventors: Nobutoshi Sagawa, Mikio Nagasawa, Sigeo Ihara, Katsuro Kikuchi, Masahiko Hirao, Kirin Ka, Satoshi Itoh, Yoshio Suzuki
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Patent number: 5811682Abstract: An electromagnetic acoustic transducer for magnets and a sheet type coil unit. The magnets are permanent magnets or electromagnets to provide a static magnetic field to an object to be inspected. The coil unit includes a pair of spiral or meander coils of an electrically conductive material, sandwiched between upper and middle insulation sheet and middle and lower insulation sheet. The coils are used for transmission and reception, respectively. All the ends of the respective coils extend through throughholes formed through the upper and middle insulation sheets to the surface of the ultrasonic transducer, and are connected to external leads. The ends for earth are commonly connected to form a common ground terminal. The inspection system with the electromagnetic acoustic resonance which is a combination of resonant technique and a non-contact electromagnetic acoustic transducer can evaluates the absolute value of ultrasonic attenuation.Type: GrantFiled: December 12, 1996Date of Patent: September 22, 1998Assignee: Ebara CorporationInventors: Toshihiro Ohtani, Hirotsugu Ogi, Masahiko Hirao