Patents by Inventor Tatsuya Houmoto

Tatsuya Houmoto 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).

  • Signal processing device for optical pick-up and a semiconductor device for the optical pick-up
    Patent number: 5796689
    Abstract: A signal processing device for optical pick-up includes an information signal silicon photo diode (SPD) group having a plurality of silicon photo diodes. A first electrode of each of the respective silicon photo diodes is connected to a common connection node. A second electrode of each of the respective silicon photo diodes is connected to a corresponding electric potential. An information signal amplifier includes an input node connected to the common connection point and an output node for outputting an information signal. A focus signal SPD group includes a plurality of silicon photo diodes. First electrodes of each of the respective silicon photo diodes of the focus signal SPD group are connected in common and further are connected to the input node of the information signal amplifier.
    Type: Grant
    Filed: December 19, 1996
    Date of Patent: August 18, 1998
    Assignees: Mitsubishi Denki Kabushiki Kaisha, Mitsubishi Electric Engineering Co., Ltd.
    Inventors: Tatsuya Houmoto, Fumihide Murao