Patents by Inventor Katsuyuki Hirata

Katsuyuki Hirata 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).

  • Patent number: 5715067
    Abstract: In a digital image forming apparatus, when a latent image is formed on a photoconductor, a light from a light source is emitted in a period of a duty ratio while modulated according to image data, and the latent image is developed and transferred onto a sheet of paper. The duty ratio, defined as a ratio of a light-emitting time of a light exposing the photoconductor to a period for exposing a dot, is changed in the same document according to dot information on the document such as an edge signal. In the modulation of the optical intensity, the light emission onto the photoconductor is performed with a duty ratio which may be set for each dot. Image portions formed with different duty ratios may exist at the same time in a reproduced image. For example, an edge portion in a document is reproduced at the duty ratio of 100% while a non-edge portion is reproduced at the duty ratio less than 100%.
    Type: Grant
    Filed: March 4, 1996
    Date of Patent: February 3, 1998
    Assignee: Minolta Co., Ltd.
    Inventors: Kentaro Katori, Masahiro Kouzaki, Yoshinobu Hada, Yukihiko Okuno, Katsuyuki Hirata
  • Patent number: 5694223
    Abstract: A printer control unit carries out a predetermined calculation based on the amount of adhering toner detected by an AIDC sensor and the surface potential of a photoconductor detected by a V sensor to correct the light emission intensity of a light source to prepare light emission characteristic data for .gamma. correction to obtain an optimal image. A .gamma. correcting unit corrects an image signal output from an image signal processing unit using the calculated light emission characteristic data for .gamma. correction to control the light source to emit light based on the corrected data. More specifically, since the .gamma. correction data is obtained by calculation, optimal .gamma. correction can always be carried out without a memory of a large capacity.
    Type: Grant
    Filed: March 6, 1996
    Date of Patent: December 2, 1997
    Assignee: Minolta Co., Ltd.
    Inventors: Kentaro Katori, Toshifumi Watanabe, Yukihiko Okuno, Masaki Tanaka, Hironobu Nakata, Katsuyuki Hirata