Patents Examined by Noach Vuong
  • Patent number: 6771576
    Abstract: An optical reproduction apparatus in accordance with the present invention has a gain control circuit for controlling a gain of an amplifier circuit which amplifies a reproduction signal in accordance with amplitudes of the reproduction signal from an optical recording medium. The amplitude is sent to a power control calculation circuit which controls the reproduction power of a light beam in accordance with the amplitude. The gain control circuit has a slower response speed than that of the power control circuit at least during a period when the power control circuit controls the reproduction power. This allows to provide an optical reproduction apparatus that can realize the stable reproduction power and automatic gain control even to the unevenness of the amplitudes of the reproduction signal.
    Type: Grant
    Filed: April 11, 2001
    Date of Patent: August 3, 2004
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Tetsuya Okumura, Shigemi Maeda