Patents by Inventor Yosuke Kuroiwa

Yosuke Kuroiwa 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).

  • Light receiving circuit, semiconductor laser device, and optical pickup device
    Patent number: 7470886
    Abstract: There is provided a light receiving circuit capable of preventing an output variation of the light receiving circuit due to a change in ambient temperature with a simple configuration. The light receiving circuit is provided with a photodiode 4 for LD power monitoring and an I-V amplifier 5 connected with a feedback resistor 13, wherein a light receiving section 16 of the photodiode 4 is covered with a protective film 19. Temperature dependences between a light transmittance of the protective film 19 in accordance-with a shift of a wavelength of a laser beam due to a change in ambient temperature, and a resistance value of the feedback resistor 13 are set in such a way that they may be mutually compensated and an output voltage from the light receiving circuit may be constant for a temperature change.
    Type: Grant
    Filed: January 10, 2006
    Date of Patent: December 30, 2008
    Assignee: Panasonic Corporation
    Inventors: Yuzo Shimizu, Hisatada Yasukawa, Shinichi Hamaguchi, Kenji Imaizumi, Shinichi Miyamoto, Yosuke Kuroiwa
  • Light receiving circuit, semiconductor laser device, and optical pickup device
    Publication number: 20060233207
    Abstract: There is provided a light receiving circuit capable of preventing an output variation of the light receiving circuit due to a change in ambient temperature with a simple configuration. The light receiving circuit is provided with a photodiode 4 for LD power monitoring and an I-V amplifier 5 connected with a feedback resistor 13, wherein a light receiving section 16 of the photodiode 4 is covered with a protective film 19. Temperature dependences between a light transmittance of the protective film 19 in accordance-with a shift of a wavelength of a laser beam due to a change in ambient temperature, and a resistance value of the feedback resistor 13 are set in such a way that they may be mutually compensated and an output voltage from the light receiving circuit may be constant for a temperature change.
    Type: Application
    Filed: January 10, 2006
    Publication date: October 19, 2006
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Yuzo Shimizu, Hisatada Yasukawa, Shinichi Hamaguchi, Kenji Imaizumi, Shinichi Miyamoto, Yosuke Kuroiwa