Patents by Inventor Kentaro Eguchi

Kentaro Eguchi 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).

  • Dimming apparatus for fluorescent lamps
    Patent number: 6133697
    Abstract: The present invention is to provide a fluorescent lamp dimming apparatus capable of continuously dimming the fluorescent lamp, and capable of eliminating a fluctuation of light outputs, and in particular, capable of turning ON the fluorescent lamp in a low temperature.
    Type: Grant
    Filed: September 23, 1999
    Date of Patent: October 17, 2000
    Assignees: Mitsubishi Denki Kabushiki Kaisha, Mitsubishi Lighting Fixture Co., Ltd.
    Inventors: Satoshi Nagai, Kenichiro Nishi, Takahisa Hamaguchi, Kentaro Eguchi, Jun Bunya, Osamu Ishikawa
  • Discharge lamp igniting apparatus including feedback control
    Patent number: 5952793
    Abstract: A current flowing through a discharge lamp 4 is detected by a current detecting circuit 5, and the detected current is outputted as a lamp current signal A to a feedback control circuit 7 where a difference between the lamp current signal A and the dimming control signal B is obtained and amplified, and then a simplified signal D is outputted to an adder 12 which adds the amplified signal D to the dimming control signal B to constitute a control signal E. The control signal is fed back to a high frequency power supply 2. When a comparing circuit 15 detects that the light level of the dimming control signal B with respect to the full light becomes higher than or equal to 40% to 60%, the feedback circuit is disconnected by operating a switch 13 provided between an error amplifying circuit 9 and an adder 12 to stop the feedback control.
    Type: Grant
    Filed: March 11, 1997
    Date of Patent: September 14, 1999
    Assignees: Mitsubishi Denki Kabushiki Kaisha, Mitsubishi Lighting Fixture Co., Ltd.
    Inventors: Kenichiro Nishi, Satoshi Nagai, Kentaro Eguchi, Takeshi Arai, Jun Bunya, Kazutaka Shimizu, Koji Shibata, Isamu Ogawa
  • Discharge lamp igniting apparatus for performing a feedback control of a discharge lamp and the like
    Patent number: 5910713
    Abstract: A current flowing through a discharge lamp 4 is detected by a current detecting circuit 5, and the detected current is outputted as a lamp current signal A to a feedback control circuit 7 where a difference between the lamp current signal A and the dimming control signal B is obtained and amplified, and then a amplified signal D is outputted to an adder 12 which adds the amplified signal D to the dimming control signal B to constitute a control signal E. The control signal is fed back to a high frequency power supply 2. When a comparing circuit 15 detects that the light level of the dimming control signal B with respect to the full light becomes higher than or equal to 40% to 60%, the feedback circuit is disconnected by operating a switch 13 provided between an error amplifying circuit 9 and an adder 12 to stop the feedback control.
    Type: Grant
    Filed: August 6, 1998
    Date of Patent: June 8, 1999
    Assignees: Mitsubishi Denki Kabushiki Kaisha, Mitsubishi Lighting Fixture Co., Ltd.
    Inventors: Kenichiro Nishi, Satoshi Nagai, Kentaro Eguchi, Takeshi Arai, Jun Bunya, Kazutaka Shimizu, Koji Shibata, Isamu Ogawa