Patents by Inventor Kazuo Shirakawa
Kazuo Shirakawa 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: 7501959Abstract: A signal incoming direction estimation apparatus is constructed so as to comprise a sensor array having plural sensors and the impedance of each of the sensors being set to a predetermined value, respectively, and a variable impedance adjustment means having a variable impedance, being selectively connected to any one of the sensors of the sensor array, and controlling the current distribution of each of the above-mentioned sensors. Due to this, it becomes possible for the signal incoming direction estimation apparatus to carry out a beam scan only by manipulating at least one impedance without simultaneously manipulating all of the sensor impedances and thereby a high-speed beam scan (directional control) becomes possible.Type: GrantFiled: August 26, 2005Date of Patent: March 10, 2009Assignee: Fujitsu LimitedInventor: Kazuo Shirakawa
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Publication number: 20080316090Abstract: A DSSS (Direct Sequence Spectrum Spreading) radar has a transmitting part to transmit a transmitting signal, including a predetermined code sequence, to one or a plurality of targets, a receiving part to receive a received signal corresponding to the transmitting signal which has been reflected from the one or a plurality of targets, and a computing part. The computing part computes a sum signal and a difference signal of received signals received by the receiving part at different points in time, and obtains a Doppler frequency of the one or a plurality of targets based on a phase difference between the sum signal and the difference signal.Type: ApplicationFiled: March 13, 2008Publication date: December 25, 2008Inventor: Kazuo Shirakawa
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Patent number: 7450056Abstract: The search/detection apparatus modulates a carrier signal by a modulation signal, generates a probe signal for detecting the location of a target, and receives the probe signal reflected by the target as an echo signal. Then, the search/detection apparatus detects the existence of an interference signal other than the echo signal from the received signal and modifies the parameter of the modulation signal and/or carrier signal.Type: GrantFiled: May 31, 2006Date of Patent: November 11, 2008Assignees: Fujitsu Limited, Fujitsu Ten LimitedInventors: Kazuo Shirakawa, Naofumi Ohkubo, Tetsuo Seki, Kanako Honda, Osamu Isaji
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Publication number: 20080204306Abstract: A detecting and ranging apparatus and a program product obtain a correct relative velocity vector by a simple calculation based on a relative distance etc. obtained by a plurality of detectors such as a radar etc. by including: two relative distance measurement units receiving a reflected wave of a transmitted electromagnetic wave by an object to be detected, and thereby measuring a relative distance to the object to be detected, arranged at with each other different position; and an actual velocity vector calculation unit calculating an actual velocity vector of the object to be detected moving with an angle made in a direction from either relative distance measurement unit to the object to be detected based on the relative distances measured by the relative distance measurement units.Type: ApplicationFiled: December 13, 2007Publication date: August 28, 2008Inventor: Kazuo Shirakawa
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Publication number: 20080169966Abstract: An on-vehicle radar device has a transmission section for transmitting a radio wave to an object, a receive section for receiving the radio wave reflected by the object, and a processing section for dividing an object detection range into three or more of a plurality of areas, setting a threshold of an intensity of the radio wave received for each of the plurality of areas, and judging the existence of an object by comparing the intensity of the radio wave and the threshold. This processing section sets, based on an auto-cruise control mode or pre-crash mode of the vehicle, a threshold of a part of an area in the object detection range to be lower than the threshold of the other areas, or changes the threshold of the detection area according to the object detection status.Type: ApplicationFiled: August 3, 2007Publication date: July 17, 2008Applicants: FUJITSU TEN LIMITED, FUJITSU LIMITEDInventors: Masataka Tsuchihashi, Nobukazu Shima, Kazuo Shirakawa
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Publication number: 20080136702Abstract: A radar device has a long range radar sensor having a first transmission and receiving section for transmitting and receiving radio wave to a first detection range and a first signal processing section for detecting an object existing in the first detection range; a short range radar sensor having a second transmission and receiving section for transmitting and receiving a radio wave to a second detection range of which width is wider and of which distance is shorter than the first detection range and a second signal processing section for detecting an object existing in the second detection range; and a processing section for integrating information supplied from the first and second signal processing sections. And one of the long range radar sensor and the short range radar sensor stops a detection operation of the object to an overlapped range of both the detection ranges.Type: ApplicationFiled: July 20, 2007Publication date: June 12, 2008Applicants: FUJITSU TEN LIMITED, FUJITSU LIMITEDInventors: Masataka Tsuchihashi, Nobukazu Shima, Kazuo Shirakawa
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Publication number: 20080122681Abstract: An arriving direction estimating device for estimating the arriving direction of an arriving wave with high accuracy and at high speed by using a sensor array. The arriving direction estimating device comprises a receiving section for generating a baseband signal from the arriving signals received by sensors, a matrix creating section for creating a spatial average covariance matrix R by combining the correlation vector of the baseband signal, a projection matrix creating section for creating a projection matrix Q from the matrix R depending on the number of signals of the arriving signals, a scale matrix creating section for creating a scale matrix S from a partial matrix of the matrix R, and an estimating section for estimating the arriving direction of the arriving wave from the angle distribution or an algebraic equation by using QS?1QH defined using the projection matrix Q and the scale matrix S.Type: ApplicationFiled: June 19, 2007Publication date: May 29, 2008Inventor: Kazuo Shirakawa
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Patent number: 7379020Abstract: A radio wave direction-of-arrival estimation apparatus and method that can estimate, at high speed and with good accuracy, the direction of arrival of a plurality of incoming waves having high correlation.Type: GrantFiled: March 10, 2006Date of Patent: May 27, 2008Assignee: Fujitsu LimitedInventors: Masataka Tsuchihashi, Yasushi Seike, Kazuo Shirakawa, Jingmin Xin
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Publication number: 20080106458Abstract: Provide an on-vehicle radar device that performs transmission control of a monitoring signal, following fixed rules, so that interference with other radar devices can be avoided with certainty. An on-vehicle radar device comprises a transceiver which transmits/receives a monitoring signal at a specified frequency band and transmits a priority order signal at a frequency within the above-mentioned frequency band, and a controller which switches the signals transmitted by the transceiver. The transceiver receives a priority order signal of another radar device, and when interference with the signal of the other radar device is detected, the controller, based on the priority order of that other device and on the priority order of the device itself, shifts, by a specified frequency amount, the frequency band of the monitoring signal transmitted by the transceiver.Type: ApplicationFiled: March 30, 2007Publication date: May 8, 2008Applicants: FUJITSU TEN LIMITED, FUJITSU LIMITEDInventors: Kanako Honda, Osamu Isaji, Kazuo Shirakawa, Naofumi Ohkubo, Tetsuo Seki
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Publication number: 20080024352Abstract: A wide monitor area can be covered by switching the connection between a plurality of sensors and a transmission/reception device using a switch device of a target detection apparatus in a time division manner. When only two target detection apparatuses are used in positioning a target, the position of a target can be identified according to the information about an area common to both angle ranges covered by the two apparatuses or the total propagation distance information from one apparatus to the other apparatus through each target.Type: ApplicationFiled: January 26, 2007Publication date: January 31, 2008Inventor: Kazuo Shirakawa
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Publication number: 20080007455Abstract: An incoming direction estimation apparatus estimates an incoming direction of a radar wave using three or more sensors or antennas simultaneously. An arithmetic expression for estimating an incoming direction of a radar wave is configured as sin?1((½?a)*tan?1b). The “a” is d/? determined by an antenna interval and by a wavelength ? of a carrier, or such, carrying the radar wave. A simultaneous use of three antennas makes it possible to set the a as a value depending on a value d0=a0? based on the interval between first antennas and value d1=a1? based on the interval between second antennas. Therefore, if a wide field of vision of an incoming direction is needed, it is only necessary to adjust (d1?d0)/?=(a1?a0), in place of the absolute interval of antennas a=d/?, thereby making it possible to lessen a limitation on the design of antennas and set a field of vision of the incoming direction appropriately.Type: ApplicationFiled: August 17, 2007Publication date: January 10, 2008Applicant: FUJITSU LIMITEDInventor: Kazuo Shirakawa
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Publication number: 20070188373Abstract: The search/detection apparatus modulates a carrier signal by a modulation signal, generates a probe signal for detecting the location of a target, and receives the probe signal reflected by the target as an echo signal. Then, the search/detection apparatus detects the existence of an interference signal other than the echo signal from the received signal and modifies the parameter of the modulation signal and/or carrier signal.Type: ApplicationFiled: May 31, 2006Publication date: August 16, 2007Applicants: Fujitsu Limited, Fujitsu Ten LimitedInventors: Kazuo SHIRAKAWA, Naofumi Ohkubo, Tetsuo Seki, Kanako Honda, Osamu Isaji
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Publication number: 20070176822Abstract: A wide monitor area can be covered by switching the connection between a plurality of sensors and a transmission/reception device using a switch device of a target detection apparatus in a time division manner. When only two target detection apparatuses are used in positioning a target, the position of a target can be identified according to the information about an area common to both angle ranges covered by the two apparatuses or the total propagation distance information from one apparatus to the other apparatus through each target.Type: ApplicationFiled: April 7, 2006Publication date: August 2, 2007Inventor: Kazuo Shirakawa
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Patent number: 7196656Abstract: An apparatus for estimating direction of arrival of signal is provided that has excellent performance in terms of angular resolution and the number of signals that can be identified. In an array sensor comprising a plurality of sensor elements, the two outermost sensor elements are alternately selected by a switch for use as a transmitting sensor, and the other sensor elements are selected in time division fashion as receiving sensors. With this arrangement, the effective aperture is increased to about twice the physical aperture, to improve angular resolution in a direction-of-arrival estimator.Type: GrantFiled: December 21, 2004Date of Patent: March 27, 2007Assignee: Fujitsu LimitedInventor: Kazuo Shirakawa
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Publication number: 20060261968Abstract: A signal incoming direction estimation apparatus is constructed so as to comprise a sensor array having plural sensors and the impedance of each of the sensors being set to a predetermined value, respectively, and a variable impedance adjustment means having a variable impedance, being selectively connected to any one of the sensors of the sensor array, and controlling the current distribution of each of the above-mentioned sensors. Due to this, it becomes possible for the signal incoming direction estimation apparatus to carry out a beam scan only by manipulating at least one impedance without simultaneously manipulating all of the sensor impedances and thereby a high-speed beam scan (directional control) becomes possible.Type: ApplicationFiled: August 26, 2005Publication date: November 23, 2006Inventor: Kazuo Shirakawa
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Publication number: 20060208947Abstract: A radio wave direction-of-arrival estimation apparatus and method that can estimate, at high speed and with good accuracy, the direction of arrival of a plurality of incoming waves having high correlation.Type: ApplicationFiled: March 10, 2006Publication date: September 21, 2006Inventors: Masataka Tsuchihashi, Yasushi Seike, Kazuo Shirakawa, Jingmin Xin
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Publication number: 20060066474Abstract: An apparatus for estimating direction of arrival of signal is provided that has excellent performance in terms of angular resolution and the number of signals that can be identified. In an array sensor comprising a plurality of sensor elements, the two outermost sensor elements are alternately selected by a switch for use as a transmitting sensor, and the other sensor elements are selected in time division fashion as receiving sensors. With this arrangement, the effective aperture is increased to about twice the physical aperture, to improve angular resolution in a direction-of-arrival estimator.Type: ApplicationFiled: December 21, 2004Publication date: March 30, 2006Inventor: Kazuo Shirakawa
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Patent number: 5100498Abstract: A patterned structure including a plurality of patterned sheet members which have respective configurations and which are partially superposed on each other and which cooperate with each other to define a plurality of voids. At least one of the sheet members includes a thin-walled portion whose thickness is smaller than a thickness of the other portion. The thin-walled portion is formed by etching the appropriate sheet member or members. The thin-walled portion of one sheet member engages the corresponding thin-walled portion or the other portion of the other sheet member or members.Type: GrantFiled: March 1, 1991Date of Patent: March 31, 1992Assignees: NGK Insulators, Ltd., Toppan Printing Co., Ltd.Inventors: Yukihisa Takeuchi, Tetsuo Watanabe, Azuma Yamamoto, Kazuo Shirakawa, Takao Segawa
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Patent number: 5023700Abstract: A patterned structure including a plurality of patterned sheet members which have respective configurations and which are partially superposed on each other and which cooperate with each other to define a plurality of voids. At least one of the sheet members includes a thin-walled portion whose thickness is smaller than a thickness of the other portion. The thin-walled portion is formed by etching the appropriate sheet member or members. The thin-walled portion of one sheet member engages the corresponding thin-walled portion or the other portion of the other sheet member or members.Type: GrantFiled: June 16, 1989Date of Patent: June 11, 1991Assignees: NGK Insulators, Ltd., Toppan Printing Co., Ltd.Inventors: Yukihisa Takeuchi, Tetsuo Watanabe, Azuma Yamamoto, Kazuo Shirakawa, Takao Segawa
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Patent number: 4433043Abstract: A water based photosensitive composition comprises a hydrolyzate of a mammal collagen and a photosensitizer serving to cross-link the hydrolyzate when exposed to an active light. The hydrolyzate has a number-average molecular weight, Mn, of 2,000 to 30,000 and an intrinsic viscosity, [.eta.], of 0.060 to 0.155 dl/g in a 0.15 mole citric acid buffer solution maintained at 40.degree.C. Also, the hydrolyzate is capable of maintaining the formability of the collagen fold. A photoresist pattern formed by using the composition exhibits a high resolution, a good dyeing property and a strong corrosion resistance.Type: GrantFiled: November 13, 1981Date of Patent: February 21, 1984Assignees: Toppan Printing Co., Ltd., Nippi, Inc.Inventors: Yoshikatu Sawada, Kazuo Shirakawa, Takeo Sugiura