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GB1419520A - Method and apparatus for forming a positive electrostatic image - Google Patents

Method and apparatus for forming a positive electrostatic image

Info

Publication number
GB1419520A
GB1419520A GB4542772A GB4542772A GB1419520A GB 1419520 A GB1419520 A GB 1419520A GB 4542772 A GB4542772 A GB 4542772A GB 4542772 A GB4542772 A GB 4542772A GB 1419520 A GB1419520 A GB 1419520A
Authority
GB
United Kingdom
Prior art keywords
screen
field
forming
conductive
nov
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
GB4542772A
Inventor
Hewitt D Crane
George J Eilers
Gerald L Pressman
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.)
Electroprint Inc
Original Assignee
Electroprint Inc
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 Electroprint Inc filed Critical Electroprint Inc
Publication of GB1419520A publication Critical patent/GB1419520A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/34—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the powder image is formed directly on the recording material, e.g. by using a liquid toner
    • G03G15/344—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the powder image is formed directly on the recording material, e.g. by using a liquid toner by selectively transferring the powder to the recording medium, e.g. by using a LED array
    • G03G15/346—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the powder image is formed directly on the recording material, e.g. by using a liquid toner by selectively transferring the powder to the recording medium, e.g. by using a LED array by modulating the powder through holes or a slit

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)

Abstract

1419520 Electro-photographic apparatus ELECTROPRINT Inc 11 Nov 1972 [11 Nov 1971] 45427/72 Heading G2H A developed image of an original 30 is produced on a paper held on conductive plate 20 by projection of toner particles from source 14 through modulating screen 24. The screen 24 comprises an array of individually controllable apertures, each with means for forming a first field within the aperture so polarized as to block the passage of particles, means for forming a second field counteracting the first field and means for discharging the second field. Preferably the screen 24 comprises an insulating layer 40 between two conductive layers 38, 42, and has a photo-conductive layer towards its rear face 28. Until projected light from the original falls on the photo-conductive layer surrounding an aperture in the screen, fields set up between the conductive layers 38, 42 block the passage of toner particles.
GB4542772A 1971-11-11 1972-11-11 Method and apparatus for forming a positive electrostatic image Expired GB1419520A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19787771A 1971-11-11 1971-11-11

Publications (1)

Publication Number Publication Date
GB1419520A true GB1419520A (en) 1975-12-31

Family

ID=22731103

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4542772A Expired GB1419520A (en) 1971-11-11 1972-11-11 Method and apparatus for forming a positive electrostatic image

Country Status (9)

Country Link
US (1) US3713734A (en)
JP (1) JPS5642868B2 (en)
CA (1) CA1021006A (en)
CH (1) CH579293A5 (en)
DE (1) DE2255132A1 (en)
FR (1) FR2159885A5 (en)
GB (1) GB1419520A (en)
IT (1) IT966842B (en)
NL (1) NL7214968A (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4014694A (en) * 1972-08-17 1977-03-29 Electroprint, Inc. Method and apparatus for forming a positive electrostatic image
JPS5427145B2 (en) * 1973-08-01 1979-09-07
GB1480842A (en) * 1973-06-19 1977-07-27 Canon Kk Electrophotography
US4006983A (en) * 1973-10-29 1977-02-08 Electroprint, Inc. Electrostatic color printing systems using modulated ion streams
US3942980A (en) * 1974-07-16 1976-03-09 Addressograph-Multigraph Corporation Ion modulator device and method of using in positive and negative modes
US4086088A (en) * 1976-03-25 1978-04-25 Addressograph Multigraph Corporation Imaging methods for use with charged particle modulator device
JPS53131A (en) * 1976-06-24 1978-01-05 Olympus Optical Co Ltd Electrophotographic device
US4168164A (en) * 1976-07-08 1979-09-18 Konishiroku Photo Industry Co., Ltd. Screen process for forming electrostatic latent images
JPS53108441A (en) 1977-03-04 1978-09-21 Olympus Optical Co Ltd Zerographic apparatus
JPS53109636A (en) * 1977-03-07 1978-09-25 Olympus Optical Co Ltd Electrophotographic method and apparatus
US4158564A (en) * 1977-04-04 1979-06-19 Electroprint, Inc. Method and apparatus for controlling the gray scale response of a multilayer image forming screen
DE2827642C2 (en) * 1977-06-24 1982-06-24 Olympus Optical Co., Ltd., Tokyo Control grid for image-wise modulation of an ion current in an electrostatic copier
US4218124A (en) * 1977-11-22 1980-08-19 Konishiroku Photo Industry Co., Ltd. Photo-sensitive screen for producing electrostatic latent image
JPS5412752A (en) * 1978-05-16 1979-01-30 Canon Inc Photosensitvie screen
US4600292A (en) * 1983-04-07 1986-07-15 Konishiroku Photo Industry Co., Ltd. Photoconductive screen

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA553355A (en) * 1958-02-18 International Business Machines Corporation Apparatus and method for xerographic printing
DE1156308B (en) * 1956-01-10 1963-10-24 Albert Lieb Method and apparatus for producing images by electrophotographic means
US3339469A (en) * 1962-08-06 1967-09-05 Sun Chemical Corp Electrostatic printing apparatus
JPS41832Y1 (en) * 1964-06-16 1966-01-27
US3680954A (en) * 1965-04-30 1972-08-01 Eastman Kodak Co Electrography
US3532422A (en) * 1966-07-14 1970-10-06 Electroprint Inc Method and apparatus for electrostatic color reproduction
US3645614A (en) * 1968-03-01 1972-02-29 Electroprint Inc Aperture-controlled electrostatic printing system employing ion projection
US3603790A (en) * 1968-04-30 1971-09-07 Kodak Ltd Electroradiographic process

Also Published As

Publication number Publication date
FR2159885A5 (en) 1973-06-22
AU4695272A (en) 1974-03-28
DE2255132A1 (en) 1973-05-17
US3713734A (en) 1973-01-30
NL7214968A (en) 1973-05-15
JPS5642868B2 (en) 1981-10-07
CA1021006A (en) 1977-11-15
JPS4859840A (en) 1973-08-22
CH579293A5 (en) 1976-08-31
IT966842B (en) 1974-02-20

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee