×

Image forming apparatus with charging member supplied with first and second DC voltages of opposite polarities

  • US 5,678,136 A
  • Filed: 07/19/1995
  • Issued: 10/14/1997
  • Est. Priority Date: 07/19/1994
  • Status: Expired due to Term
First Claim
Patent Images

1. An image forming apparatus, comprising:

  • an image bearing member;

    a charging member for charging said image bearing member at a charging position, said charging member being contactable to said image bearing member;

    wherein said charging member is adapted to be supplied with a first DC voltage of a predetermined polarity for forming an image on said image bearing member and contains ion conduction material, and wherein said charging member is adapted to be supplied with a second DC voltage of a polarity opposite from the predetermined polarity when such an area of said image bearing member as is going to be a non-image area of said image bearing member is at a charging position, and wherein when said second DC voltage is applied, said charging member is separated from said image bearing member.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×