Patents by Inventor Kazunori Hayami
Kazunori Hayami 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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Publication number: 20170276771Abstract: A method for controlling a laser radar device, the method includes: closing a first switch configured to open or close a power supply circuit including a laser element; applying a voltage in a forward direction to the laser element; illuminating an object with an electromagnetic wave emitted from the laser element; applying, to the laser element, a voltage in a reverse direction that is opposite to the forward direction when the first switch is opened; detecting a reflected wave from the object; and measuring a location of the object.Type: ApplicationFiled: January 25, 2017Publication date: September 28, 2017Applicant: FUJITSU LIMITEDInventors: Kazunori Hayami, Koichi Iida
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Publication number: 20170047844Abstract: A power supply apparatus includes: a power supply circuit, including a switch configured to perform switching at a frequency, configured to generate an output voltage to be supplied to a load device; a phase compensator configured to perform feedback control of switching duty of the switch in accordance with the output voltage, and change a response characteristic of the output voltage to a load fluctuation of the load device in accordance with a reference voltage and the output voltage; and a controller configured to apply a pilot signal over a frequency range to the reference voltage, monitor the output voltage, and control the response characteristic in accordance with the pilot signal and the output voltage.Type: ApplicationFiled: June 27, 2016Publication date: February 16, 2017Applicant: FUJITSU LIMITEDInventor: Kazunori Hayami
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Patent number: 9461542Abstract: A power supply apparatus includes a power supply section and a control section. The power supply section includes a first switch which performs switching of power-supply output, an inductor and a capacitor which form an LC circuit that resonates current flowing through the first switch, and a second switch which changes capacitance of the capacitor. The control section finds in advance a correspondence between a time ratio of a switching pulse of the first switch and a resonance frequency which matches an edge of a switching pulse having each time ratio, and controls switching of the second switch so as to resonate the LC circuit at a resonance frequency corresponding to a time ratio at operation time.Type: GrantFiled: July 30, 2014Date of Patent: October 4, 2016Assignee: FUJITSU LIMITEDInventors: Kazunori Hayami, Yoshiyasu Nakashima, Yu Yonezawa
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Publication number: 20150084607Abstract: A power supply apparatus includes a power supply section and a control section. The power supply section includes a first switch which performs switching of power-supply output, an inductor and a capacitor which form an LC circuit that resonates current flowing through the first switch, and a second switch which changes capacitance of the capacitor. The control section finds in advance a correspondence between a time ratio of a switching pulse of the first switch and a resonance frequency which matches an edge of a switching pulse having each time ratio, and controls switching of the second switch so as to resonate the LC circuit at a resonance frequency corresponding to a time ratio at operation time.Type: ApplicationFiled: July 30, 2014Publication date: March 26, 2015Inventors: Kazunori Hayami, Yoshiyasu Nakashima, Yu Yonezawa
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Patent number: 7595656Abstract: An interface circuit includes a driver circuit (12) made up of a combination of a plurality of transistors, a calibration circuit (14) for performing selection of on and off of one or more of the plurality of transistors for adjusting on-resistance thereof, and a terminating resistor (13) that is connected to an output side of the driver circuit (12). One or more of the transistors are turned on based on an output of the calibration circuit (14), so that a combination resistance value of the on-resistance and the terminating resistor matches characteristic impedance of the transmission line. The driver circuit (12), the calibration circuit (14) and the terminating resistor (13) are formed on the same semiconductor integrated circuit SK, and the calibration circuit (14) detects process variation and temperature variation of the transistor and the resistor formed on the semiconductor integrated circuit (SK).Type: GrantFiled: November 29, 2007Date of Patent: September 29, 2009Assignee: Fujitsu LimitedInventors: Kazunori Hayami, Tetsuya Ohtani
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Patent number: 7538626Abstract: A voltage controlled oscillator circuit includes a ring oscillator including a plurality of delay circuits that are connected like a ring and a voltage to current converter circuit for controlling current flowing in the ring oscillator so as to change an oscillation frequency thereof. The voltage to current converter circuit 11 is provided with a shunt circuit for shunting a part of current obtained by converting input voltage, and the shunted part of the current is used for controlling the current flowing in the ring oscillator.Type: GrantFiled: July 26, 2006Date of Patent: May 26, 2009Assignee: Fujitsu LimitedInventors: Tatsuya Yamaguchi, Kazunori Hayami, Satoshi Yamamoto
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Publication number: 20080180130Abstract: An interface circuit includes a driver circuit (12) made up of a combination of a plurality of transistors, a calibration circuit (14) for performing selection of on and off of one or more of the plurality of transistors for adjusting on-resistance thereof, and a terminating resistor (13) that is connected to an output side of the driver circuit (12). One or more of the transistors are turned on based on an output of the calibration circuit (14), so that a combination resistance value of the on-resistance and the terminating resistor matches characteristic impedance of the transmission line. The driver circuit (12), the calibration circuit (14) and the terminating resistor (13) are formed on the same semiconductor integrated circuit SK, and the calibration circuit (14) detects process variation and temperature variation of the transistor and the resistor formed on the semiconductor integrated circuit (SK).Type: ApplicationFiled: November 29, 2007Publication date: July 31, 2008Applicant: Fujitsu LimitedInventors: Kazunori Hayami, Tetsuya Ohtani
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Publication number: 20070236298Abstract: A voltage controlled oscillator circuit includes a ring oscillator including a plurality of delay circuits that are connected like a ring and a voltage to current converter circuit for controlling current flowing in the ring oscillator so as to change an oscillation frequency thereof. The voltage to current converter circuit 11 is provided with a shunt circuit for shunting a part of current obtained by converting input voltage, and the shunted part of the current is used for controlling the current flowing in the ring oscillator.Type: ApplicationFiled: July 26, 2006Publication date: October 11, 2007Inventors: Tatsuya Yamaguchi, Kazunori Hayami, Satoshi Yamamoto
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Patent number: 6868200Abstract: The present invention is directed to the provision of a wavelength division multiplexing optical transmission apparatus and, more particularly, to a wavelength division multiplexing optical transmission apparatus having high wavelength stability unaffected by the temperature characteristics, aging, etc. of an arrayed-waveguide grating (AWG) and its peripheral components.Type: GrantFiled: February 19, 2002Date of Patent: March 15, 2005Assignee: Fujitsu LimitedInventors: Koichi Kimotsuki, Kazunori Hayami, Tatsuo Nagayoshi, Takanori Maki
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Publication number: 20040013428Abstract: A light source generates a continuous wave light. A data signal source generates a data signal. A pilot signal is multiplexed on the data signal. The frequency of the pilot signal is much lower than that of the data signal. An LN modulator modulates the continuous wave light using the data signal on which the pilot signal is multiplexed. A data detection unit monitors whether a frequency component two times as high as the frequency of the pilot signal is contained in the output light from the LN modulator. Unless the frequency component two times as high as the frequency of the pilot signal is contained, it is determined that the data signal has stopped or disappeared, and outputs an alarm.Type: ApplicationFiled: February 13, 2003Publication date: January 22, 2004Applicant: FUJITSU LIMITEDInventors: Isao Nakajima, Kazunori Hayami
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Publication number: 20030026528Abstract: The present invention is directed to the provision of a wavelength division multiplexing optical transmission apparatus and, more particularly, to a wavelength division multiplexing optical transmission apparatus having high wavelength stability unaffected by the temperature characteristics, aging, etc. of an arrayed-waveguide grating (AWG) and its peripheral components.Type: ApplicationFiled: February 19, 2002Publication date: February 6, 2003Applicant: FUJITSU LIMITEDInventors: Koichi Kimotsuki, Kazunori Hayami, Tatsuo Nagayoshi, Takanori Maki
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Patent number: 6317249Abstract: The present invention relates to an optical transmitter and particularly to an optical transmitter including an external optical modulator such as Mach-Zehnder type optical modulator which modulates the light from a light source to output an optical signal with a drive voltage signal generated depending on an input signal According to the present invention is achieved by providing an optical modulator, which add weighting to operating point control signal in accordance with optical output level of the modulator.Type: GrantFiled: December 6, 1999Date of Patent: November 13, 2001Assignee: Fujitsu LimitedInventors: Hiroshi Nakamoto, Takao Naito, Kazunori Hayami, Shinji Sonoda
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Patent number: 5088106Abstract: A phase shift circuit includes a first trailing-edge elongating circuit that elongates a trailing edge of each pulse of an input clock signal so as to fall gradually and outputs a first clock signal having a first elongated fall time. A signal inversion circuit inverts the first clock signal supplied from the first trailing-edge elongating circuit and outputs an inverted version of the first clock signal. A second trailing-edge elongating circuit elongates a trailing edge of each pulse of the inverted version of the first clock signal so as to fall gradually and outputs a second clock signal having a second elongated fall time. The second clock signal is an output signal of the phase shift circuit and lags behind the input clock signal by a predetermined time based on the first and second elongated fall times. The present invention further provides a repeater which uses the above-mentioned phase shift circuit.Type: GrantFiled: March 9, 1990Date of Patent: February 11, 1992Assignee: Fujitsu LimitedInventors: Mitsuo Kitamura, Kazunori Hayami