GB1172873A – Electrography and Photosensitive Element therefor
– Google Patents
GB1172873A – Electrography and Photosensitive Element therefor
– Google Patents
Electrography and Photosensitive Element therefor
Info
Publication number
GB1172873A
GB1172873A
GB940567A
GB940567A
GB1172873A
GB 1172873 A
GB1172873 A
GB 1172873A
GB 940567 A
GB940567 A
GB 940567A
GB 940567 A
GB940567 A
GB 940567A
GB 1172873 A
GB1172873 A
GB 1172873A
Authority
GB
United Kingdom
Prior art keywords
layer
photo
trapping
conductive
conductive layer
Prior art date
1966-03-07
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB940567A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Katsuragawa Electric Co Ltd
Original Assignee
Katsuragawa Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1966-03-07
Filing date
1967-02-28
Publication date
1969-12-03
1967-02-28
Application filed by Katsuragawa Electric Co Ltd
filed
Critical
Katsuragawa Electric Co Ltd
1969-12-03
Publication of GB1172873A
publication
Critical
patent/GB1172873A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
G—PHYSICS
G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
G03G5/02—Charge-receiving layers
G03G5/024—Photoelectret layers
G—PHYSICS
G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
G03G13/00—Electrographic processes using a charge pattern
G03G13/056—Electrographic processes using a charge pattern using internal polarisation
Abstract
1,172,873. Electrographic material. KATSURAGAWA DENKI K.K. 28 Feb., 1967 [7 March, 1966], No. 9405/67. Heading H1K. A photo-sensitive element for use in electrography comprises a thin photo-conductive layer, at least one side of the layer being integrally bonded with a trapping layer and a highly insulating layer on the surface of the trapping layer. The photo-conductive layer changes its volume specific resistivity by at least a factor of 10 upon irradiation and the trapping layer contains a large number of impurity levels which trap charge carriers injected therein sufficiently deep to prevent thermal release of the carriers. A method of electrography comprises applying a D.C. voltage of one polarity across a photo-sensitive element as above and then applying a D.C. voltage of opposite polarity across the element concurrently with imagewise exposure. The conductive layer 1 (Fig. 1) may be of Al, paper, Nesa glass or plastics sheet. The photo-conductive layer 2 may be sintered or vapour deposited films of CdS, CdSe, Se, ZnO, polyvinyl carbazole or mixtures thereof. The trapping layer 3 may be ZnS, ZnCdS 2 activated with Cu, Ag or Pb, anthracene, anthraquinone, S or PbO. The insulating layer 5 may be transparent and of polyester. A combined photo-conductive and trapping layer may be made by diffusing impurities into a layer of photo-conductive material and then performing a second diffusion to give at least one thin layer which has trapping properties. The D.C. voltages may be applied either with an electrode or a corona discharge. A drum 14 (Fig. 4) has a conductive layer 1 thereon, a photo-conductive layer 2, a trapping layer 3 and an insulating layer 5. An object 18 is illuminated by light sources 19 and focused on to the drum by the optical system 20. A corona discharge 15 and if required a light source 16 first apply a voltage of one polarity to the drum and a second corona discharge 17 applies a voltage of opposite polarity. In an alternative embodiment (Fig. 3, not shown), a charging and exposing system using an electrode is disclosed. It is said that the sequential application of voltages of opposite polarities produces an apparent change in the dielectric constant of the trapping layer and that differences in the persistent internal polarization due to exposed and unexposed portions of the layer are thereby emphasized. Development of the electrostatic image may take place under illumination since the charge pattern can only be erased by the application of an electric field.
GB940567A
1966-03-07
1967-02-28
Electrography and Photosensitive Element therefor
Expired
GB1172873A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
JP1420366
1966-03-07
Publications (1)
Publication Number
Publication Date
GB1172873A
true
GB1172873A
(en)
1969-12-03
Family
ID=11854539
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB940567A
Expired
GB1172873A
(en)
1966-03-07
1967-02-28
Electrography and Photosensitive Element therefor
Country Status (6)
Country
Link
BR
(1)
BR6787559D0
(en)
CH
(1)
CH486725A
(en)
FR
(1)
FR1513169A
(en)
GB
(1)
GB1172873A
(en)
NL
(1)
NL159793B
(en)
SU
(1)
SU478468A3
(en)
1967
1967-02-28
GB
GB940567A
patent/GB1172873A/en
not_active
Expired
1967-03-01
CH
CH309167A
patent/CH486725A/en
not_active
IP Right Cessation
1967-03-06
BR
BR18755967A
patent/BR6787559D0/en
unknown
1967-03-07
FR
FR97750A
patent/FR1513169A/en
not_active
Expired
1967-03-07
NL
NL6703561A
patent/NL159793B/en
not_active
IP Right Cessation
1967-03-07
SU
SU1160600A
patent/SU478468A3/en
active
Also Published As
Publication number
Publication date
DE1522655A1
(en)
1969-10-16
NL159793B
(en)
1979-03-15
CH486725A
(en)
1970-02-28
FR1513169A
(en)
1968-02-09
SU478468A3
(en)
1975-07-25
BR6787559D0
(en)
1973-05-17
NL6703561A
(en)
1967-09-08
DE1522655B2
(en)
1972-11-30
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Legal Events
Date
Code
Title
Description
1970-04-15
PS
Patent sealed
1983-03-23
PE
Patent expired
