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EP0454869A1
Expired / Lapsed
EP
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Electrostatic information recording medium and electrostatic information recording/reproducing method
Assignee: Dai Nippon Printing Co Ltd
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Filing: 1990-11-16
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Granted: —
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Expires: 2010-11-16
Abstract
Abstract An electrostatic information recording medium of the invention comprises: an electrode layer (13) and a charge-holding layer, wherein the charge-holding layer is made up of a laminate of a resin layer (11a) having a low glass transition temperature and a heat-resistant insulating layer (11b); at least an electrode layer (13) and a charge-holding layer, as well as a polymer layer provided on the charge-holding layer, the polymer layer containing a pentaflurostyrene as a monomer component and having a weight average molecular weight of 10,000 to 2,000,000; a photoconductive layer and a charge-holding layer arranged between a pair of electrodes, wherein an electrostatic latent image formed by the exposure while applying a voltage across the two electrodes or formed by the application of a voltage while effecting the exposure, is held on the surface of the charge-holding layer by peeling the charge-holding layer from the electrode; or a charge transit layer formed on the electrode, wherein information by toner is recorded on the surface of the charge transit layer and when an electrostatic charge is given to the surface, the charge given onto the toner is poured into the charge transit layer through electrically conductive material of toner to form electrostatic information corresponding to toner information on the charge transit layer maintaining excellent electrostatic information-holding characteristics, and wherein the electrostatic information stored in the electrostatic information recording medium remains very stable since it is stored in the charge-holding layer and, at the time of reproducing information, the potential difference between the electrode and the surface potential is measured to easily detect the potential difference, enabling the information to be easily reproduced maintaining high quality and high resolution.
Inventors
- 👤 Minoru C/O Dai Nippon Printing Co. Ltd. Utsumi
- 👤 Hiroyuki c/o Dai Nippon Printing Co. Ltd. OBATA
- 👤 Seiji c/o Dai Nippon Printing Co. Ltd. TAKE
- 👤 Masayuki c/o Dai Nippon Printing Co. Ltd. IIJIMA
- 👤 Hironori c/o Dai Nippon Printing Co.Ltd KAMIYAMA
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 16:06
CPC Classifications
G; G11; G11B; G11B9/00; G11B9/08; G03; G03G; G03G15/00; G03G15/04; G03G15/04036; G03G15/04045; G03G15/04072; G03G15/22; G03G15/221; G03G5/00; G03G5/02; G11B11/00; G11B11/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
36 words
An electrostatic information-recording medium including an electrode layer and a charge-retaining layer, characterized in that said charge-retaining layer comprises a laminate of a resin layer having a low glass transition temperature with a heat-resistant, insulating layer.
Claim 2
Dependent Claim
33 words
An electrostatic information-recording medium as claimed in Claim 1, wherein the resin layer having a low glass transition temperature and the heat-resistant, insulating layer are laminated on the electrode layer in that order.
Claim 3
Dependent Claim
33 words
An electrostatic information-recording medium as claimed in Claim 1, wherein the heat-resistant, insulating layer and the resin layer having a low glass transition temperature are laminated on the electrode layer in that order.
Claim 4
Dependent Claim
118 words
A process for recording and reproducing electrostatic information, characterized by: recording the information in an electrostatic information-recording medium as such, said recording medium comprising an electrode layer and a charge-retaining layer, said charge-retaining layer comprising a laminate of a resin layer having a low glass transition temperature with a heat-resistant, insulating layer, or recording the information in said recording medium while said recording medium is heated at a temperature higher than said glass transition temperature of said resin layer having a low glass transition temperature, or recording the information in said recording medium and, then, heating said recording medium at a temperature higher than the glass transition temperature of said resin layer having a low glass transition temperature.
Claim 5
Dependent Claim
166 words
A process for recording and reproducing electrostatic information, characterized by: locating a photosensitive member including a photosensitive layer on at least an electrode layer in opposite relation to an electrostatic information-recording medium including an electrode layer and a charge-retaining layer, said charge-retaining layer comprising a laminate of a resin layer having a low glass transition temperature with a heat-resistant, insulating layer, and recording the information in said recording medium by exposing said recording medium to light with the application of voltage between both said electrodes or applying voltage between said both electrodes while said recording medium is exposed to light, or recording the information in said recording medium while said recording medium is heated at a temperature higher than the glass transition temperature of said resin layer having a low glass transition temperature, or recording the information in said recording medium and, then, heating said recording medium at a temperature higher than the glass transition temperature of said resin layer having a low glass transition temperature.
Claim 6
Dependent Claim
35 words
An electrostatic information-recording medium comprising at least an electrode layer and a charge-retaining layer, characterized in that said charge-retaining layer is a pentafluorostyrene polymer layer and having a weight-average molecular weight of 10,000 to 2,000,000.
Claim 7
Dependent Claim
49 words
An electrostatic information-recording medium comprising at least an electrode layer and a charge-retaining layer, characterized in that said charge-retaining layer is obtained by the successive lamination of a fluoropolymer layer and a pentafluorostyrene polymer layer and having a weight-average molecular weight of 10,000 to 2,000,000 on said electrode layer.
Claim 8
Dependent Claim
99 words
A process for recording and reproducing electrostatic information, characterized by: locating a photosensitive member including a photoconductive layer on at least an electrode layer in opposite and contact or non-contact relation to an electrostatic information-recording medium obtained by laminating on at least an electrode layer a pentafluorostyrene polymer layer having a weight-average molecular weight of 10,000 to 2,000,000, and forming an electrostatic charge pattern on said recording medium by exposing said recording medium to light with the application of voltage between both said electrodes or applying voltage between both said electrodes while said recording medium is exposed to light.
Claim 9
Dependent Claim
107 words
A process for recording and reproducing electrostatic information, characterized by: locating a photosensitive member including a photoconductive layer on at least an electrode layer in opposite and contact or non-contact relation to an electrostatic information-recording medium obtained by the successive lamination on at least an electrode layer of a fluoropolymer layer and a pentafluorostyrene polymer layer and having a weight-average molecular weight of 10,000 to 2,000,000, and forming an electrostatic charge pattern on said recording medium by exposing said recording medium to light with the application of voltage between both said electrodes or applying voltage between both said electrodes while said recording medium is exposed to light.
Claim 10
Dependent Claim
79 words
An electrostatic information-recording medium including a photoconductive layer and a charge-retaining layer between a pair of electrodes, characterized in that said recording medium is exposed to light with the application of voltage between said pair of electrodes or voltage is applied between said pair of electrodes while said recording medium is exposed to light to form an electrostatic latent image, and the associated electrode is released from said charge-retaining layer to carry said latent image on said charge-retaining layer.
Claim 11
Dependent Claim
113 words
A process for recording and reproducing electrostatic information, characterized by: providing an electrostatic information-recording medium including a photoconductive layer and a charge-retaining layer between a pair of electrodes, exposing said recording medium to light with the application of voltage between said both electrodes or applying voltage between both said electrodes while said recording medium is exposed to light, thereby forming an electrostatic latent image, grounding both said electrodes, releasing the associated electrode from said charge-retaining layer to allow the charges on said associated electrode to remain on said charge-retaining layer by release discharge, and subjecting said recording medium to uniform exposure to carry said latent image on the surface of said charge-retaining layer.
Claim 12
Dependent Claim
74 words
An electrostatic information-recording medium including a charge transport layer on an electrode, characterized in that electrostatic information is recorded on the surface of said charge transport layer by toner development, and electrostatic charges are thereafter applied on said surface to inject the charges applied on said toner into said charge transport layer through an electrically conductive layer of said toner, thereby forming electrostatic information corresponding to the toner information on said charge transport layer.
Claim 13
Dependent Claim
106 words
A process for recording the information of an electrostatic information-recording medium, characterized by: locating a photosensitive member including a photoconductive layer on an electrode in opposite relation to an electrostatic information-recording medium including a charge transport layer on an electrode, carrying out image exposure from said photosensitive member with the application of voltage between both said electrodes, or applying voltage between both said electrodes while image exposure is carried out from said photosensitive member or said recording medium, and separating said recording medium from said photosensitive member for toner development of charges on the surface of said recording medium thus separated, thereby forming a toner image.
References Cited (Backward Citations)
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