ATE4435T1 - METHOD FOR IMPROVING THE MAXIMUM DENSITY AND TONE RANGE OF ELECTROGRAPHIC IMAGES AND ELECTROGRAPHIC COPY MACHINE FOR CARRYING OUT THE METHOD. - Google Patents

METHOD FOR IMPROVING THE MAXIMUM DENSITY AND TONE RANGE OF ELECTROGRAPHIC IMAGES AND ELECTROGRAPHIC COPY MACHINE FOR CARRYING OUT THE METHOD.

Info

Publication number
ATE4435T1
ATE4435T1 AT80301189T AT80301189T ATE4435T1 AT E4435 T1 ATE4435 T1 AT E4435T1 AT 80301189 T AT80301189 T AT 80301189T AT 80301189 T AT80301189 T AT 80301189T AT E4435 T1 ATE4435 T1 AT E4435T1
Authority
AT
Austria
Prior art keywords
electrographic
maximum density
improving
carrying
images
Prior art date
Application number
AT80301189T
Other languages
German (de)
Inventor
George Philip Kasper
Arthur Stanley Kroll
Michael Mosehauer
Original Assignee
Eastman Kodak Company
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=21855368&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=ATE4435(T1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Eastman Kodak Company filed Critical Eastman Kodak Company
Application granted granted Critical
Publication of ATE4435T1 publication Critical patent/ATE4435T1/en

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
    • G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
    • G03G15/04027—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material and forming half-tone image

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Dry Development In Electrophotography (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Magnetic Brush Developing In Electrophotography (AREA)
  • Liquid Crystal (AREA)
  • Paper (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Photoreceptors In Electrophotography (AREA)

Abstract

The image quality obtainable by an electrographic copying process in which an electrostatic latent image formed by imagewise exposure of a uniformly charged photoconductive layer, or otherwise, is developed with a toner can be improved if the latent image comprises discrete charge bearing zones, preferably formed by a supplementary exposure through a half-tone screen, and if additionally the toner is electrically conductive either intrinsically or as a result of electrical break-down. In this manner, the maximum density obtainable in a copy can be increased and the contrast decreased sufficiently to allow good reproduction of both continuous tone and high contrast images.
AT80301189T 1979-04-16 1980-04-15 METHOD FOR IMPROVING THE MAXIMUM DENSITY AND TONE RANGE OF ELECTROGRAPHIC IMAGES AND ELECTROGRAPHIC COPY MACHINE FOR CARRYING OUT THE METHOD. ATE4435T1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US3066879A 1979-04-16 1979-04-16
EP80301189A EP0018742B2 (en) 1979-04-16 1980-04-15 Method of improving maximum density and tonal range of electrographic images and an electrographic copying apparatus using the method

Publications (1)

Publication Number Publication Date
ATE4435T1 true ATE4435T1 (en) 1983-08-15

Family

ID=21855368

Family Applications (1)

Application Number Title Priority Date Filing Date
AT80301189T ATE4435T1 (en) 1979-04-16 1980-04-15 METHOD FOR IMPROVING THE MAXIMUM DENSITY AND TONE RANGE OF ELECTROGRAPHIC IMAGES AND ELECTROGRAPHIC COPY MACHINE FOR CARRYING OUT THE METHOD.

Country Status (7)

Country Link
EP (1) EP0018742B2 (en)
JP (1) JPS5619067A (en)
AT (1) ATE4435T1 (en)
AU (1) AU536674B2 (en)
BR (1) BR8002337A (en)
DE (2) DE3014449C2 (en)
FR (1) FR2454646A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8400922A (en) * 1984-03-23 1985-10-16 Oce Nederland Bv METHOD FOR MAKING COPIES.

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2598732A (en) * 1949-03-09 1952-06-03 Haloid Co Electrophotography
DE1175985B (en) * 1959-11-05 1964-08-13 Agfa Ag Process for making electro-photographic images
US3337339A (en) * 1962-10-01 1967-08-22 Xerox Corp Screen xerography
NL298605A (en) * 1962-10-01
US3335003A (en) * 1963-10-09 1967-08-08 Xerox Corp Reflex xerographic process
US3627526A (en) * 1969-12-29 1971-12-14 Rca Corp Electrophotographic recording elements with half-tone screen coatings thereon
US3681071A (en) * 1970-01-02 1972-08-01 Rca Corp Method of pressure treating electrophotographic recording elements to change their sensitivity to light
ZA73911B (en) * 1972-03-15 1973-11-28 Minnesota Mining & Mfg Electrographic development process
US3905822A (en) * 1973-10-23 1975-09-16 Xerox Corp Compound screen for object screening
US4051536A (en) * 1975-03-14 1977-09-27 Xerox Corporation Electronic halftone imaging system
US4083632A (en) * 1976-04-05 1978-04-11 Xerox Corporation Multi-frequency screen
JPS52143826A (en) * 1976-05-26 1977-11-30 Mita Industrial Co Ltd Electric recording method
US4076857A (en) * 1976-06-28 1978-02-28 Eastman Kodak Company Process for developing electrographic images by causing electrical breakdown in the developer

Also Published As

Publication number Publication date
FR2454646B1 (en) 1983-12-09
FR2454646A1 (en) 1980-11-14
DE3064518D1 (en) 1983-09-15
EP0018742A1 (en) 1980-11-12
AU536674B2 (en) 1984-05-17
JPH0210954B2 (en) 1990-03-12
EP0018742B2 (en) 1988-08-24
DE3014449A1 (en) 1980-10-30
JPS5619067A (en) 1981-02-23
EP0018742B1 (en) 1983-08-10
BR8002337A (en) 1980-12-02
AU5751880A (en) 1980-10-23
DE3014449C2 (en) 1986-03-27

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Legal Events

Date Code Title Description
UEP Publication of translation of european patent specification
UEP Publication of translation of european patent specification
REN Ceased due to non-payment of the annual fee