Patents by Inventor Akira Nakajo

Akira Nakajo 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).

  • Patent number: 7545107
    Abstract: There is provided an electrodeless discharge lamp lighting device with small size and low cost by simplifying a noise suppression part and a lighting apparatus having the electrodeless discharge lamp lighting device. A counter circuit of a frequency signal generating circuit repeatedly generates a frequency signal of which the amplitude is varied in a multi-step shape on the basis of an oscillation period of an oscillation circuit. An oscillation circuit outputs an oscillation signal of a frequency corresponding to the amplitude of the frequency signal. A drive circuit drives a switching element of an inverter circuit at the frequency of the oscillation signal and the inverter circuit applies a high-frequency voltage generated by the switching operation of the switching element to an induction coil to start up and light the electrodeless discharge lamp.
    Type: Grant
    Filed: March 28, 2006
    Date of Patent: June 9, 2009
    Assignee: Panasonic Electric Works Co., Ltd.
    Inventors: Shohei Yamamoto, Hiroshi Kido, Akira Nakajo
  • Publication number: 20080157693
    Abstract: There is provided an electrodeless discharge lamp lighting device with small size and low cost by simplifying a noise suppression part and a lighting apparatus having the electrodeless discharge lamp lighting device. A counter circuit of a frequency signal generating circuit repeatedly generates a frequency signal of which the amplitude is varied in a multi-step shape on the basis of an oscillation period of an oscillation circuit. An oscillation circuit outputs an oscillation signal of a frequency corresponding to the amplitude of the frequency signal. A drive circuit drives a switching element of an inverter circuit at the frequency of the oscillation signal and the inverter circuit applies a high-frequency voltage generated by the switching operation of the switching element to an induction coil to start up and light the electrodeless discharge lamp.
    Type: Application
    Filed: March 28, 2006
    Publication date: July 3, 2008
    Applicant: MATSUSHITA ELECTRIC WORKS, LTD.
    Inventors: Shohei Yamamoto, Hiroshi Kido, Akira Nakajo
  • Patent number: 7339329
    Abstract: A ballast for an electrodeless discharge lamp includes a high frequency power supply that supplies a high frequency electric power to an induction coil for operating the lamp. A dimmer controller generates a control signal in response to a dimmer command designating a varying dimming ratio. The control signal defines a first period Ton in which the power supply is controlled to apply a coil voltage of a first level V1 to the induction coil for operating the lamp. The first period is followed by a second period Toff in which the power supply is controlled to apply the coil voltage of a second level V2 that is lower than the first level and fails to sustain the lamp. The control signal defines, between the second period and the first period, a starting period Tst in which the coil voltage increases continuously for smooth transition from an off-condition to an on-condition of the lamp.
    Type: Grant
    Filed: November 21, 2003
    Date of Patent: March 4, 2008
    Assignee: Matsushita Electric Works, Ltd.
    Inventors: Shinji Makimura, Hiroshi Kido, Shingo Masumoto, Yuji Kumagai, Akira Nakajo
  • Patent number: 7262617
    Abstract: A method for manufacturing an integrated circuit, a measurement apparatus of an integrated circuit, and a wafer that reduces damages inflicted on bonding pads while enabling a probe test to be accurately performed. A sensor cell is arranged on a wafer between chip formation regions. The sensor cell has a diaphragm. Sensor pads, connected to a doping region, are arranged on the surface of the diaphragm. Probe needles contact the sensor pads. This strains the doping region and produces a corresponding voltage measured by the probe needles connected to the sensor pads. Relative inclination angle and relative distance of a probe card, which includes the probe needles, and the wafer are determined based on the measured voltage. A conduction test is performed by having the probe needles contact the bonding pad of the wafer while maintaining the determined the relative position.
    Type: Grant
    Filed: July 26, 2006
    Date of Patent: August 28, 2007
    Assignee: Freescale Semiconductor Inc.
    Inventors: Kenji Komatsu, Akira Nakajo
  • Publication number: 20070024300
    Abstract: A method for manufacturing an integrated circuit, a measurement apparatus of an integrated circuit, and a wafer that reduces damages inflicted on bonding pads while enabling a probe test to be accurately performed. A sensor cell is arranged on a wafer between chip formation regions. The sensor cell has a diaphragm. Sensor pads, connected to a doping region, are arranged on the surface of the diaphragm. Probe needles contact the sensor pads. This strains the doping region and produces a corresponding voltage measured by the probe needles connected to the sensor pads. Relative inclination angle and relative distance of a probe card, which includes the probe needles, and the wafer are determined based on the measured voltage. A conduction test is performed by having the probe needles contact the bonding pad of the wafer while maintaining the determined the relative position.
    Type: Application
    Filed: July 26, 2006
    Publication date: February 1, 2007
    Inventors: Kenji Komatsu, Akira Nakajo
  • Publication number: 20060290294
    Abstract: A ballast for an electrodeless discharge lamp includes a high frequency power supply that supplies a high frequency electric power to an induction coil for operating the lamp. A dimmer controller generates a control signal in response to a dimmer command designating a varying dimming ratio. The control signal defines a first period Ton in which the power supply is controlled to apply a coil voltage of a first level V1 to the induction coil for operating the lamp. The first period is followed by a second period Toff in which the power supply is controlled to apply the coil voltage of a second level V2 that is lower than the first level and fails to sustain the lamp. The control signal defines, between the second period and the first period, a starting period Tst in which the coil voltage increases continuously for smooth transition from an off-condition to an on-condition of the lamp.
    Type: Application
    Filed: November 21, 2003
    Publication date: December 28, 2006
    Applicant: MATSUSHITA ELECTRIC WORKS, LTD.,
    Inventors: Shinji Makimura, Hiroshi Kido, Shingo Masumoto, Yuji Kumagai, Akira Nakajo
  • Patent number: 6610717
    Abstract: Dihydropyridine derivatives represented by the following formula: analogs thereof and pharmaceutically acceptable salts thereof have an activity of selectively inhibiting the action of N-type calcium channel, and they are used as therapeutic agents for various diseases relating to N-type calcium channel.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: August 26, 2003
    Assignee: Ajinomoto Co., Inc.
    Inventors: Akira Nakajo, Munetaka Tokumasu, Morikazu Kito, Akira Takahara, Yukitsugu Ono, Tomoko Takeda, Yuki Kajigaya, Hajime Koganei
  • Publication number: 20020193605
    Abstract: Dihydropyridine derivatives represented by the following formula: 1
    Type: Application
    Filed: December 21, 2001
    Publication date: December 19, 2002
    Applicant: AJINOMOTO CO. INC
    Inventors: Akira Nakajo, Munetaka Tokumasu, Morikazu Kito, Akira Takahara, Yukitsugu Ono, Tomoko Takeda, Yuki Kajigaya, Hajime Koganei