Patents by Inventor Masayuki Tamada

Masayuki Tamada 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).

  • Image sensor driving circuit
    Patent number: 4788595
    Abstract: An image sensor driving circuit for driving an image sensor by applying a voltage thereto comprises a voltage supplying circuit for supplying a positive or negative polarity voltage to the image sensor responsive to a control signal, a converting circuit for converting an output photocurrent of the image sensor into a detection voltage, an inverting circuit for inverting the detection voltage responsive to the control signal, and a control circuit for generating the control signal. The control signal has a predetermined period so that the voltage supplying circuit alternately supplies the positive and negative polarity voltages with the predetermined period and the inverting circuit inverts the detection voltage only during one of first and second halves of each period of the control signal.
    Type: Grant
    Filed: November 13, 1987
    Date of Patent: November 29, 1988
    Assignees: Ricoh Company, Ltd., Tohoku Ricoh Co., Ltd.
    Inventors: Masayuki Tamada, Junichi Takahashi