Patents by Inventor Masahiko Itaya

Masahiko Itaya 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: 4499169
    Abstract: The invention is directed to a developing method for electrophotography in which an insulating magnetic toner contacts an electrostatic image carrier to develop an electrostatic latent image. A magnetic bias is applied to restrain movement of the magnetic toner toward the image carrier and an alternating electric field is applied to the toner, all subject to the condition V/d.gtoreq.0.1.nu. in which V represents the effective voltage impressed upon the toner, d represents the clearance in millimeters between the image carrier and a developing sleeve, and .nu. represents the frequency in kilohertz of the alternating electric field.
    Type: Grant
    Filed: December 9, 1982
    Date of Patent: February 12, 1985
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Satoshi Haneda, Masahiko Itaya, Makoto Tomono
  • Patent number: 4492456
    Abstract: An electrostatic latent image developing device having a non-magnetic carrier member for carrying a developer and fixed magnets installed inside said carrier member, and a regulating member disposed over the carrier member for regulating a developer layer thickness on the surface of the carrier member at a point between two peaks of a magnetic flux produced by two closely arranged magnets having same polarity inside the carrier member. The regulating member is a doctor blade and the carrier member is a rotatable cylindrical sleeve.
    Type: Grant
    Filed: July 21, 1982
    Date of Patent: January 8, 1985
    Assignee: Knoishiroku Photo Industry Co. Ltd.
    Inventors: Satoshi Haneda, Masahiko Itaya, Minoru Tanaka
  • Patent number: 4491083
    Abstract: A developing apparatus for developing an electrostatic latent image on a charge receptor comprising a developing member for supplying toner to the electrostatic latent image on the charge receptor and an image forming means arranged in developing direction downstream of said developing member, said image forming means including an electrode to which a voltage is applied so as to form an alternating electric field between said charge receptor and said electrode, and means for applying said voltage to said electrode.
    Type: Grant
    Filed: July 22, 1982
    Date of Patent: January 1, 1985
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Masahiko Itaya, Satoshi Haneda, Makoto Tomono
  • Patent number: 4486089
    Abstract: A magnetic brush developing apparatus for an electrophotographic copying machine or electrostatic recording machine has a sleeve in which a plurality of magnetic pieces are arranged in alternating polarity. Each piece has a shape which produces two or more magnetic peaks. The sleeve and the magnets are rotated in opposite directions. As a result of the the above, a soft developer body is obtained, and density unevenness or striping of the image is avoided.
    Type: Grant
    Filed: July 26, 1982
    Date of Patent: December 4, 1984
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Masahiko Itaya, Satoshi Haneda, Yukio Okamoto
  • Patent number: 4480911
    Abstract: In an electrostatic copying apparatus of the type in which a magnetic toner is applied to an image holder such as a drum from a developing roller which in turn receives the toner from a supply roller, a source of relative positive and negative voltages is alternately applied to the developing roller. This produces electric fields which move the toner from the supply roller to the developing roller and then to the image holder with the desired relative polarities.
    Type: Grant
    Filed: June 22, 1982
    Date of Patent: November 6, 1984
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Masahiko Itaya, Satoshi Haneda, Makoto Tomono
  • Patent number: 4479709
    Abstract: A method of cleaning off a residual toner from the surface of an image forming member in an electrophotography apparatus comprises applying an alternating electric field between the surface of the image forming member and a cleaning member, for causing the residual toner to move from the surface of the image forming member to the cleaning member and to adhere on the cleaning member.
    Type: Grant
    Filed: June 8, 1982
    Date of Patent: October 30, 1984
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Kastuhiro Syukuri, Satoshi Haneda, Masahiko Itaya
  • Patent number: 4478870
    Abstract: A corona discharge method wherein corona ion flow having direct current component with a polarity opposite to an electrification polarity of toner on a transfer material is applied on the transfer material such that a density of the ion flow on incoming half area of corona discharge area is more sparsely than that of the ion flow on outgoing half area, in order to transfer the toner from an image receptor onto the transfer material.
    Type: Grant
    Filed: February 11, 1983
    Date of Patent: October 23, 1984
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Satoshi Haneda, Masahiko Itaya
  • Patent number: 4477174
    Abstract: A two-cycle electrophotographic copying apparatus includes a rotatable charge retaining member, a charging device, an exposure mechanism, a developing device and a transferring device sequentially arranged around the charge retaining member in the direction of its rotation. During a first rotation of the charge retaining member, a toner image of an original is formed, and during the second rotation of the charge retaining member, the remaining toner is cleaned from the charge retaining member to prepare it for its next succeeding copying operation.
    Type: Grant
    Filed: July 7, 1982
    Date of Patent: October 16, 1984
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Satoshi Haneda, Makoto Tomono, Masahiko Itaya
  • Patent number: 4431296
    Abstract: A developing apparatus comprising a developing agent conveyor for conveying a developing agent, said developing agent conveyor including a multiplicity of pairs of electrodes each composed of a first electrode and a second electrode faced to said first electrode through a charging space so that an alternating electric field is generated in said charging space by the coactions of said first and second electrodes.
    Type: Grant
    Filed: April 21, 1982
    Date of Patent: February 14, 1984
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Satoshi Haneda, Masahiko Itaya, Makoto Tomono