Patents by Inventor Akiko Takeya

Akiko Takeya 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).

  • Discharge lamp lighting apparatus
    Patent number: 6967449
    Abstract: The present invention relates to a discharge lamp lighting apparatus in which overshoot occurring when the polarity of AC rectangular wave voltage/current is inverted is suppressed. An inverter converts DC power supplied by a converter to AC rectangular wave power and outputs the AC rectangular wave power. A power calculation unit generates a power detection signal based upon a voltage detection signal and a current detection signal detected on the output side of the converter. A control target value setting unit outputs an output power command value to be used to control the DC power so as to achieve a target value. A correction signal generation unit outputs a correction signal to be used to correct the output power command value in conformance to the power detection signal in synchronization with a polarity inversion of the AC rectangular wave power.
    Type: Grant
    Filed: March 24, 2004
    Date of Patent: November 22, 2005
    Assignee: TDK Corporation
    Inventors: Yutaka Ishihara, Akiko Takeya, Masayuki Yamashima
  • Discharge lamp lighting apparatus
    Publication number: 20040189217
    Abstract: The present invention relates to a discharge lamp lighting apparatus in which overshoot occurring when the polarity of AC rectangular wave voltage/current is inverted is suppressed. An inverter converts DC power supplied by a converter to AC rectangular wave power and outputs the AC rectangular wave power. A power calculation unit generates a power detection signal based upon a voltage detection signal and a current detection signal detected on the output side of the converter. A control target value setting unit outputs an output power command value to be used to control the DC power so as to achieve a target value. A correction signal generation unit outputs a correction signal to be used to correct the output power command value in conformance to the power detection signal in synchronization with a polarity inversion of the AC rectangular wave power.
    Type: Application
    Filed: March 24, 2004
    Publication date: September 30, 2004
    Applicant: TDK CORPORATION
    Inventors: Yutaka Ishihara, Akiko Takeya, Masayuki Yamashima