Patents by Inventor Hidehiko Fujikawa
Hidehiko Fujikawa 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: 9188671Abstract: In a malfunction detection mode, a controller is configured to compare an output of a phase-detector obtained when controlling to input an oscillation signal to only the phase-detector, with an output of the phase-detector obtained when controlling to input the oscillation signal to both of a transmitter and the phase-detector. If a change (difference) of signal levels of the outputs is equal to or more than a prescribed threshold, the controller determines that there is no malfunction in the transmitter and a receiver. If the change of the signal levels is less than the prescribed threshold, the controller determines that there is a malfunction in the transmitter or the receiver.Type: GrantFiled: September 24, 2012Date of Patent: November 17, 2015Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Toru Mugiuda, Fumihiro Kasano, Hidehiko Fujikawa, Yutaka Abe, Toshimasa Takagi, Kazushi Goto
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Publication number: 20140241125Abstract: In a malfunction detection mode, a controller is configured to compare an output of a phase-detector obtained when controlling to input an oscillation signal to only the phase-detector, with an output of the phase-detector obtained when controlling to input the oscillation signal to both of a transmitter and the phase-detector. If a change (difference) of signal levels of the outputs is equal to or more than a prescribed threshold, the controller determines that there is no malfunction in the transmitter and a receiver. If the change of the signal levels is less than the prescribed threshold, the controller determines that there is a malfunction in the transmitter or the receiver.Type: ApplicationFiled: September 24, 2012Publication date: August 28, 2014Applicant: PANASONIC CORPORATIONInventors: Toru Mugiuda, Fumihiro Kasano, Hidehiko Fujikawa, Yutaka Abe, Toshimasa Takagi, Kazushi Goto
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Patent number: 8576664Abstract: A moving object detection system is provided with an existence detection part, an integrating part and an existence judgment part. Based on first and second detection signals, the existence detection part calculates a rotation angle of each transition factor that is obtained from the first and second detection signals and rotates around the origin in a two-dimensional coordinate system. The existence detection part is configured so that the rotation angle becomes less than 90 degrees. The integrating part integrates each rotation angle to obtain an integrated angle. The existence judgment part judges whether or not a moving object approaching or leaving a receiver of the device exists in a detection area based on the integrated angle and a threshold angle.Type: GrantFiled: March 15, 2007Date of Patent: November 5, 2013Assignee: Panasonic CorporationInventors: Fumihiro Kasano, Toshimasa Takagi, Hidehiko Fujikawa, Toru Mugiuda
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Patent number: 8218395Abstract: A moving object detecting apparatus includes: a transmitting/receiving unit for radiating an ultrasonic wave and receiving a reflective wave reflected from an object present in a monitoring space; a phase detection circuit for mixing reference signals with a reflective signal and obtaining a pair of Doppler signals each having an amplitude depending on a phase difference from the reference signal, each of the Doppler signals having a different phase from each other; a rotation angle calculation unit for calculating a rotation angle; a cumulative addition unit for accumulating the rotation angle; and a comparison unit for comparing the accumulated rotation angle with a threshold value. In the moving object detecting apparatus, a single ultrasonic vibrator is commonly used in the transmitting unit and the receiving unit.Type: GrantFiled: December 16, 2011Date of Patent: July 10, 2012Assignee: Panasonic CorporationInventors: Fumihiro Kasano, Susumu Katayama, Toru Mugiuda, Kazushi Goto, Hidehiko Fujikawa, Motohiro Minamino
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Publication number: 20120087210Abstract: A moving object detecting apparatus includes: a transmitting/receiving unit for radiating an ultrasonic wave and receiving a reflective wave reflected from an object present in a monitoring space; a phase detection circuit for mixing reference signals with a reflective signal and obtaining a pair of Doppler signals each having an amplitude depending on a phase difference from the reference signal, each of the Doppler signals having a different phase from each other; a rotation angle calculation unit for calculating a rotation angle; a cumulative addition unit for accumulating the rotation angle; and a comparison unit for comparing the accumulated rotation angle with a threshold value. In the moving object detecting apparatus, a single ultrasonic vibrator is commonly used in the transmitting unit and the receiving unit.Type: ApplicationFiled: December 16, 2011Publication date: April 12, 2012Applicant: Panasonic Electric Works Co., Ltd.Inventors: Fumihiro KASANO, Susumu Katayama, Toru Mugiuda, Kazushi Goto, Hidehiko Fujikawa, Motohiro Minamino
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Patent number: 7746220Abstract: A moving object detection apparatus comprises a transmitter, a receiver, a detection portion, a binary conversion portion and a judgment portion. The transmitter emits energy waves with a first frequency to a detection area. When receiving incoming energy waves from the detection area, the receiver generates an electric signal corresponding to the incoming energy waves. The detection portion obtains a detection signal from a reference signal with the first frequency and the electric signal. The binary conversion portion compares the detection signal with a conversion threshold signal to obtain a binary signal. The judgment portion judges whether or not a moving object approaching or leaving the receiver exists in the detection area based on the binary signal.Type: GrantFiled: December 29, 2006Date of Patent: June 29, 2010Assignee: Panasonic Electric Works Co., Ltd.Inventors: Toshimasa Takagi, Fumihiro Kasano, Hidehiko Fujikawa
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Publication number: 20100052972Abstract: A moving object detection system is provided with an existence detection part, an integrating part and an existence judgment part. Based on first and second detection signals, the existence detection part calculates a rotation angle of each transition factor that is obtained from the first and second detection signals and rotates around the origin in a two-dimensional coordinate system. The existence detection part is configured so that the rotation angle becomes less than 90 degrees. The integrating part integrates each rotation angle to obtain an integrated angle. The existence judgment part judges whether or not a moving object approaching or leaving a receiver of the device exists in a detection area based on the integrated angle and a threshold angle.Type: ApplicationFiled: March 15, 2007Publication date: March 4, 2010Applicant: Panasonic Electric Works Co., LtdInventors: Fumihiro Kasano, Toshimasa Takagi, Hidehiko Fujikawa, Toru Mugiuda
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Publication number: 20090016162Abstract: A moving object detection apparatus comprises a transmitter, a receiver, a detection portion, a binary conversion portion and a judgment portion. The transmitter emits energy waves with a first frequency to a detection area. When receiving incoming energy waves from the detection area, the receiver generates an electric signal corresponding to the incoming energy waves. The detection portion obtains a detection signal from a reference signal with the first frequency and the electric signal. The binary conversion portion compares the detection signal with a conversion threshold signal to obtain a binary signal. The judgment portion judges whether or not a moving object approaching or leaving the receiver exists in the detection area based on the binary signal.Type: ApplicationFiled: December 29, 2006Publication date: January 15, 2009Applicant: MATSUSHITA ELECTRIC WORKS, LTD.Inventors: Toshimasa Takagi, Fumihiro Kasano, Hidehiko Fujikawa