GB1199462A - Enhancement of Electrostatic Images. - Google Patents

Enhancement of Electrostatic Images.

Info

Publication number
GB1199462A
GB1199462A GB44121/67A GB4412167A GB1199462A GB 1199462 A GB1199462 A GB 1199462A GB 44121/67 A GB44121/67 A GB 44121/67A GB 4412167 A GB4412167 A GB 4412167A GB 1199462 A GB1199462 A GB 1199462A
Authority
GB
United Kingdom
Prior art keywords
layer
charge
zno
image
conductivity
Prior art date
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
GB44121/67A
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.)
Xerox Ltd
Original Assignee
Rank Xerox 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.)
Filing date
Publication date
Application filed by Rank Xerox Ltd filed Critical Rank Xerox Ltd
Publication of GB1199462A publication Critical patent/GB1199462A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B21/00—Indicating the time by acoustic means
    • G04B21/02—Regular striking mechanisms giving the full hour, half hour or quarter hour
    • G04B21/027—Regular striking mechanisms giving the full hour, half hour or quarter hour with locking wheel
    • 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
    • G03G13/04—Exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
    • G03G13/045—Charging or discharging distinct portions of the charge pattern on the recording material, e.g. discharging non-image areas, contrast enhancement
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
    • Y10S430/001—Electric or magnetic imagery, e.g., xerography, electrography, magnetography, etc. Process, composition, or product
    • Y10S430/102—Electrically charging radiation-conductive surface

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)

Abstract

1,199,462. Electroluminescence. RANK XEROX Ltd. 28 Sept., 1967 [29 Sept., 1966], No. 44121/67. Heading C4S. [Also in Division G2] A method for amplifying charge variations in a latent electrostatic charge image comprises forming the image on a surface of a photoconductive material contiguous to or forming a field effect semi-conductor layer, contacting the surface with an electroluminescent layer and applying a potential to produce an electric field at the e.1. layer having an intensity in accord with the conductivity of the f.e.s.c. layer; preferably the f.e.s.c. is able to retain the surface charge when current passes, e.g. Zn, Cd or Pb oxide. A sheet of paper 15 coated with ZnO 17 is placed on a grounded conductor 35, the ZnO is uniformly negatively charged then exposed to an optical image causing discharge over illuminated areas resulting in the reversed charge image. The paper is then placed on an e.1. layer 7 and A.C. applied between adjacent electrodes 8 below the e.1. layer. In illuminated discharged areas the conductivity of the f.e.s.c. ZnO is high and a high current passes through the e.1. layer via the ZnO generating light which results in a further discharge of the charge image. In areas not illuminated the high negative charge reduces the conductivity of the ZnO and little or no current flows through the e.1. material which therefore emits no light and the charge is retained. The process is stopped by removing the paper or stopping the current when it reaches a predetermined value. If the ZnO is on a conductive A1 substrate the electrodes 8 may be replaced by a conductive layer and potential applied between this and the substrate. In another embodiment the latent image is formed on a layer of photoconductive vitreous Se on a f.e.s.c. layer, e.g. vacuum deposited n-type CdS, the layers being separated by an insulating layer. If the p.c. layer is initially charged positive areas of high charge have a high conductivity resulting in decreased contrast. The e.1. material is ZnS: CuCl 2 or ZnS, ZnSe: Cu in P.V.C. resin and electrodes 8 are vapour deposited An or Cu.
GB44121/67A 1966-09-29 1967-09-28 Enhancement of Electrostatic Images. Expired GB1199462A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US58285866A 1966-09-29 1966-09-29

Publications (1)

Publication Number Publication Date
GB1199462A true GB1199462A (en) 1970-07-22

Family

ID=34273128

Family Applications (1)

Application Number Title Priority Date Filing Date
GB44121/67A Expired GB1199462A (en) 1966-09-29 1967-09-28 Enhancement of Electrostatic Images.

Country Status (3)

Country Link
US (1) US3531646A (en)
DE (1) DE1597880B2 (en)
GB (1) GB1199462A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4877699A (en) * 1988-08-25 1989-10-31 Eastman Kodak Company Electrophotographic luminescent amplification process
US10689754B2 (en) * 2017-09-05 2020-06-23 Peter C. Salmon Programmable charge storage arrays and associated manufacturing devices and systems

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3264479A (en) * 1955-01-31 1966-08-02 Sylvania Electric Prod Electroluminescent light amplifier
US2927234A (en) * 1955-11-25 1960-03-01 Rca Corp Photoconductive image intensifier
US3169192A (en) * 1960-05-14 1965-02-09 Philips Corp Negative picture radiating apparatus
BE630893A (en) * 1962-04-10
US3322539A (en) * 1962-11-30 1967-05-30 Gen Electric Electrophotographic process
NL6407445A (en) * 1964-07-01 1966-01-03
US3441736A (en) * 1965-06-01 1969-04-29 Electro Optical Systems Inc Image intensifier including semiconductor amplifier layer

Also Published As

Publication number Publication date
US3531646A (en) 1970-09-29
DE1597880B2 (en) 1977-01-27
DE1597880A1 (en) 1970-10-01

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee