AU536674B2 - Improving maximum density and tonal range of electrographic images - Google Patents

Improving maximum density and tonal range of electrographic images

Info

Publication number
AU536674B2
AU536674B2 AU57518/80A AU5751880A AU536674B2 AU 536674 B2 AU536674 B2 AU 536674B2 AU 57518/80 A AU57518/80 A AU 57518/80A AU 5751880 A AU5751880 A AU 5751880A AU 536674 B2 AU536674 B2 AU 536674B2
Authority
AU
Australia
Prior art keywords
maximum density
toner
latent image
tonal range
obtainable
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.)
Ceased
Application number
AU57518/80A
Other versions
AU5751880A (en
Inventor
George Philip Kasper
Arthur Stanley Kroll
Michael Mosehauer
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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=AU536674(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of AU5751880A publication Critical patent/AU5751880A/en
Application granted granted Critical
Publication of AU536674B2 publication Critical patent/AU536674B2/en
Anticipated expiration legal-status Critical
Ceased 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
    • G03G15/04—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)
  • Dry Development In Electrophotography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Magnetic Brush Developing In Electrophotography (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Liquid Crystal (AREA)
  • Paper (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (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.
AU57518/80A 1979-04-16 1980-04-16 Improving maximum density and tonal range of electrographic images Ceased AU536674B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US3066879A 1979-04-16 1979-04-16
US30668 1979-04-16

Publications (2)

Publication Number Publication Date
AU5751880A AU5751880A (en) 1980-10-23
AU536674B2 true AU536674B2 (en) 1984-05-17

Family

ID=21855368

Family Applications (1)

Application Number Title Priority Date Filing Date
AU57518/80A Ceased AU536674B2 (en) 1979-04-16 1980-04-16 Improving maximum density and tonal range of electrographic images

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
JPS5619067A (en) 1981-02-23
EP0018742B2 (en) 1988-08-24
EP0018742A1 (en) 1980-11-12
FR2454646B1 (en) 1983-12-09
DE3014449A1 (en) 1980-10-30
FR2454646A1 (en) 1980-11-14
BR8002337A (en) 1980-12-02
AU5751880A (en) 1980-10-23
JPH0210954B2 (en) 1990-03-12
DE3014449C2 (en) 1986-03-27
EP0018742B1 (en) 1983-08-10
ATE4435T1 (en) 1983-08-15
DE3064518D1 (en) 1983-09-15

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