Patents by Inventor Kazuki Wakita

Kazuki Wakita 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).

  • Photosensitive body for electrophotography containing amorphous silicon layers
    Patent number: 5164281
    Abstract: A photosensitive body for electrophotography has as its principal constituent a photoconductive layer having amorphous silicon with hydrogen, a surface layer having a greater optical band gap than the photoconductive layer formed on a photoconductive base member, and an intermediate layer sandwiched therebetween.
    Type: Grant
    Filed: November 29, 1989
    Date of Patent: November 17, 1992
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Takashi Hayakawa, Shoichi Nagata, Shiro Narukawa, Kazuki Wakita, Kunio Ohashi, Yoshikazu Fujiwara
  • Heat control for photoreceptor
    Patent number: 5019862
    Abstract: Quality of images formed electrophotographically on a photoreceptor is improved by controllingly switching on and off a heater for the photoreceptor such that the photoreceptor temperature remains higher than the measured ambient temperature by several .degree.C. to 20.degree. plus several .degree.C. At the same time, the output of the charger for the photoreceptor or brightness of an image forming lamp is controlled according to the measured surface temperature of the photoreceptor.
    Type: Grant
    Filed: November 8, 1988
    Date of Patent: May 28, 1991
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masatsugu Nakamura, Kunio Ohashi, Shoichi Nagata, Kazuki Wakita, Katsuhiro Nagayama, Tadashi Tonegawa
  • Electrophotographic image formation apparatus with two bias voltage sources
    Patent number: 4994855
    Abstract: A photoreceptor for an image formation apparatus has a photosensitive layer of a multi-layer structure each having the characteristic of increasing its electrical resistance at a different rate upon expose to light. An image-carrying beam of reflected light from an original to be copied is made incident on the photoreceptor to form a resistance image. An electrostatic latent image is formed therefrom either on the photoreceptor itself or on a transfer medium placed in contact therewith and a visible toner image is formed by applying toner on such an electrostatic image but the resistance image on the photoreceptor remains undisturbed during such image transfer processes. Thus, a plurality of copies of a single original can be produced without exposing the photoreceptor to reflected light therefrom for each copy to be printed.
    Type: Grant
    Filed: May 26, 1988
    Date of Patent: February 19, 1991
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kunio Ohashi, Yoshikazy Fujiwara, Shiro Narikawa, Shoichi Nagata, Kazuki Wakita, Takashi Hayakawa
  • Electrophotographic photoreceptor comprising amorphous silicon layer coated with amorphous inorganic material
    Patent number: 4910111
    Abstract: A photoreceptor with a photoconductive layer of amorphous silicon has an overcoating layer to protect the photoconductive layer and to prevent formation of SiO.sub.x. The overcoating layer is amorphous C.sub.1-x X.sub.x, Ge.sub.1-x X.sub.x, (BNGe).sub.1-x X.sub.x or (BNC).sub.1-x X.sub.x where x is greater than or equal to 0 and smaller than 0.5 and X is H, F or Cl.
    Type: Grant
    Filed: November 8, 1988
    Date of Patent: March 20, 1990
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kazuki Wakita, Syoichi Nagata, Masatsugu Nakamura, Kunio Ohashi, Tadashi Tonegawa, Katsuhiro Nagayama
  • Electrophotographic system
    Patent number: 4757345
    Abstract: An electric photographical copying system which provides a main charger for charging the photo-conductive layer of the recording medium, an optical exposure means for projecting an image of an original onto the photo-conductive layer to make an electrostatic latent image thereon, a developing device for developing the latent image with developer, a transfer device for transferring the image developed onto a copy sheet, a cleaning device for cleaning residual developer on the photo-conductive layer and an erasing device for erasing the surface potential of the photo-conductive layer. The devices are successively activated in an order to use the recording medium repeatedly.
    Type: Grant
    Filed: January 16, 1986
    Date of Patent: July 12, 1988
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kunio Ohashi, Kazuki Wakita, Tadashi Tonegawa, Syoichi Nagata, Masatsugu Nakamura, Kazuo Maeyama