US 4,792,512 AGranted

Method of developing electrostatic images using two component developer and AC charging

AssigneeKonishiroku Photo Industry Co., Ltd.

InventorsSatoshi Haneda, Takashi Itoh, Ken Nakamura, Makoto Tomono

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Abstract

A charging method of an electrostatic image developer which makes it possible to electrically charge an insulating one-component developer or a two-component developer consisting of a toner and a carrier to a desired charged state and which comprises introducing the developer into a charging space between a pair of sheet-like charging members opposing each other in which space an alternating field is formed, and oscillating the developer by means of the alternating field for charging it. A developing method of a non-contact or contact system which develops the electrostatic image by use of the developer charged electrically by the above-mentioned charging method.

Claims8

Dependent claims

A method for developing an electrostatic latent image on the surface of an electrostatic image support member which comprises:

(i) forming an electrostatic latent image on said surface of the electric image support member,
(ii) transferring electrostatically charged developer which comprises a toner and a magnetic carrier which is coated with an insulating resin on the surface of a developer transfer member into a developing region by the relative movement between a magnet positioned in said developer transfer member and said developer transfer member, and
(iii) applying an a.c. field between said electrostatic image support member and said developer transfer member so as to develop said electrostatic latent image in accordance with a non-contact developing system.

Dependencies are inferred from the claim text.

Facts

Application: 07/064,211Filed 19 Jun 1987 · continuation
Priority: JP 56-2539025 Feb 1981
Granted: 20 Dec 1988
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G03G 15/0907
Using magnetic brush: with bias voltage
G03G 15/065
For developing: arrangements for controlling the potential of the developing electrode
Y10S 430/102
Electric or magnetic imagery, e.g., xerography, electrography, magnetography, etc. Process, composition, or product: electrically charging…
G03G
Electrography

Family

Serial349,999Parent of this division · filed 18 Feb 1982
Serial588,095Parent of this continuation · filed 9 Mar 1984
Serial833,439Parent of this continuation · filed 24 Feb 1986
US 4,675,267 AParent of this continuation
US 4,450,220 AParent of this division
US 4,792,512 AThis patent

From the US filing history. Foreign family members aren’t listed.