Patents by Inventor Tohru Miyasaka

Tohru Miyasaka 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).

  • Device for measuring surface potentials at photosensitive body and electrostatic recording apparatus using said device
    Patent number: 5182596
    Abstract: A device for measuring a surface potential at a photosensitive body including: a potential sensor for measuring surface potentials at a plurality of positions on the photosensitive body; a plurality of sample hold circuits; and an adder for adding each measured surface potential held in each sample hold circuit, or an adder which adds up each measured surface potential and average the sum. The addition or averaging of the measured values serves to eliminate eccentricity-induced errors and noise in the surface potential measurements, thereby allowing a correct surface potential to be obtained.
    Type: Grant
    Filed: July 10, 1991
    Date of Patent: January 26, 1993
    Assignees: Hitachi Koki Co., Ltd., Hitachi Ltd.
    Inventors: Takashi Nakazawa, Minoru Ohshima, Masami Ishikawa, Tsukasa Ogawa, Tohru Miyasaka, Takao Umeda