ELECTROSTATIC COPYING METHOD - DAINIPPON PRINTING CO LTD

Title:

ELECTROSTATIC COPYING METHOD

Document Type and Number:

WIPO Patent Application WO/1991/008522

Kind Code:

A1

Abstract:

A master charge retaining medium (2) carrying electrostatic information and a charge retaining medium (3) for copying are arranged in such a manner as to face each other (as shown in Fig. 2(b)). A voltage is applied between the electrodes of both charge retaining media to cause discharge and form a reverse image of electrostatic information onto the charge retaining medium for copying. The capacitance of the master charge retaining medium may be greater sufficiently than that of the charge retaining medium for copying so that the master medium can be copied any number of times with enough contrast maintained. In Fig. 7, a master charge retaining medium having an insulation layer having a high softening point and a charge retaining medium for copying having a thermoplastic resin layer (4a) are arranged in such a manner as to face each other. The thermoplastic resin layer is charged corresponding to the electrostatic image of the master charge retaining medium (2), and it is heated and softened to form corrugation. In this manner, the transfer and development of an image can be repeated any number of times without causing the leak of the static charge.

Inventors:

OKABE MASATO (JP)
IIJIMA MASAYUKI (JP)
AONO TAKASHI (JP)

Application Number:

PCT/JP1990/001551

Publication Date:

June 13, 1991

Filing Date:

November 29, 1990

Export Citation:

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Assignee:

DAINIPPON PRINTING CO LTD (JP)

International Classes:

G03G5/02; G03G5/022; G03G15/18; G03G16/00; (IPC1-7): G03G13/26; G03G15/18; G03G16/00

Foreign References:

JPS54115139A	1979-09-07
JPH04910703B
JPS52142841U	1977-10-29
JPS51148506A	1976-12-20
JPS51106504A	1976-09-21
JPS5194825A	1976-08-19

Other References: