JPS5619067A - Method of improving maximum density and tone range of electronic record image - Google Patents

Method of improving maximum density and tone range of electronic record image

Info

Publication number
JPS5619067A
JPS5619067A JP4924380A JP4924380A JPS5619067A JP S5619067 A JPS5619067 A JP S5619067A JP 4924380 A JP4924380 A JP 4924380A JP 4924380 A JP4924380 A JP 4924380A JP S5619067 A JPS5619067 A JP S5619067A
Authority
JP
Japan
Prior art keywords
maximum density
toner
electronic record
record image
tone range
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.)
Granted
Application number
JP4924380A
Other languages
Japanese (ja)
Other versions
JPH0210954B2 (en
Inventor
Fuiritsupu Kasupaa Jiyooji
Sutanrei Kurooru Aasaa
Moosenhaueru Mihaeru
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=JPS5619067(A) "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 JPS5619067A publication Critical patent/JPS5619067A/en
Publication of JPH0210954B2 publication Critical patent/JPH0210954B2/ja
Granted 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)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (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.
JP4924380A 1979-04-16 1980-04-16 Method of improving maximum density and tone range of electronic record image Granted JPS5619067A (en)

Applications Claiming Priority (1)

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

Publications (2)

Publication Number Publication Date
JPS5619067A true JPS5619067A (en) 1981-02-23
JPH0210954B2 JPH0210954B2 (en) 1990-03-12

Family

ID=21855368

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4924380A Granted JPS5619067A (en) 1979-04-16 1980-04-16 Method of improving maximum density and tone range of electronic record image

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) DE3064518D1 (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.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS494532A (en) * 1972-03-15 1974-01-16
JPS51114133A (en) * 1975-03-14 1976-10-07 Xerox Corp Method of and apparatus for half tone duplication

Family Cites Families (11)

* 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
US3905822A (en) * 1973-10-23 1975-09-16 Xerox Corp Compound screen for object screening
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS494532A (en) * 1972-03-15 1974-01-16
JPS51114133A (en) * 1975-03-14 1976-10-07 Xerox Corp Method of and apparatus for half tone duplication

Also Published As

Publication number Publication date
AU536674B2 (en) 1984-05-17
DE3064518D1 (en) 1983-09-15
EP0018742A1 (en) 1980-11-12
BR8002337A (en) 1980-12-02
EP0018742B1 (en) 1983-08-10
JPH0210954B2 (en) 1990-03-12
AU5751880A (en) 1980-10-23
DE3014449C2 (en) 1986-03-27
EP0018742B2 (en) 1988-08-24
DE3014449A1 (en) 1980-10-30
ATE4435T1 (en) 1983-08-15
FR2454646A1 (en) 1980-11-14
FR2454646B1 (en) 1983-12-09

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