Patents by Inventor Sachie Hosogoezawa

Sachie Hosogoezawa 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).

  • Magnetic brush type charging device
    Patent number: 5592264
    Abstract: In an magnetic brush charging apparatus, a following relation is satisfied, .rho..ltoreq.M/H.ltoreq.1.6 .rho., wherein H is a minimum gap distance (cm) between a cylinder and an image carrying member, .rho. is a density (g/cm.sup.3) of magnetic particles and M is an amount (g/cm.sup.2) of magnetic particles existing in a nip region coming in contact with the image carrying member.
    Type: Grant
    Filed: February 17, 1995
    Date of Patent: January 7, 1997
    Assignee: Konica Corporation
    Inventors: Kunio Shigeta, Sachie Hosogoezawa, Masahiro Onodera
  • Charging unit with variable AC voltage
    Patent number: 5457522
    Abstract: An image forming apparatus uses a contact-type charger to charge a photoreceptor. The D.C. current supplied to the charger is measured while the output value of the A.C. voltage is changed within a predetermined range, and the output value of the A.C. voltage is set in accordance with the measurement result.
    Type: Grant
    Filed: April 18, 1994
    Date of Patent: October 10, 1995
    Assignee: Konica Corporation
    Inventors: Satoshi Haneda, Kunio Shigeta, Sachie Hosogoezawa, Hiroyuki Nomori
  • Image forming apparatus with a magnetic brush charger
    Patent number: 5426489
    Abstract: An image forming apparatus such as an electrophotographic copier and an electrophotographic printer. The image forming apparatus includes: a photoreceptor for forming a toner image on its surface; a charger for charging the surface with a bias voltage, including a DC component and a AC component, through a magnetic brush member which is in contact with the surface; a driving unit for moving both of the surface of the photoreceptor and the magnetic brush member in synchronism; a laser unit for imagewisely exposing a predetermined image area of the surface, which is charged by the charger, so that a latent image is formed on the surface; and a discharge lamp for exposing the surface with light so that the surface is discharged.
    Type: Grant
    Filed: March 22, 1994
    Date of Patent: June 20, 1995
    Assignee: Konica Corporation
    Inventors: Satoshi Haneda, Kunio Shigeta, Sachie Hosogoezawa, Hiroyuki Nomori, Masakazu Fukuchi