GB1406794A - Contrast control in electrostatic copying utilizing liquid development - Google Patents

Contrast control in electrostatic copying utilizing liquid development

Info

Publication number
GB1406794A
GB1406794A GB379073A GB379073A GB1406794A GB 1406794 A GB1406794 A GB 1406794A GB 379073 A GB379073 A GB 379073A GB 379073 A GB379073 A GB 379073A GB 1406794 A GB1406794 A GB 1406794A
Authority
GB
United Kingdom
Prior art keywords
original
charged
size
areas
dots
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
GB379073A
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 Corp
Original Assignee
Xerox Corp
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 Xerox Corp filed Critical Xerox Corp
Publication of GB1406794A publication Critical patent/GB1406794A/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
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/10—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer
    • G03G15/101—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer for wetting the recording material
    • G03G15/102—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer for wetting the recording material for differentially wetting the recording material
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Wet Developing In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

1406794 Half-tone electrophotography XEROX CORP 25 Jan 1973 [28 Jan 1972] 3790/73 Heading G2H The contrast of a half-tone reproduction of an original is controlled by using the original to form an array of dots, or other information elements, as higher charged parts of an electrostatic latent image, surrounded by lower charged areas, and developing with a liquid developer which initially adheres to the higher-charged parts only and subsequently migrates into the lower-charged areas. The size of each developer dot so formed depends on its original size and on the charges of the dots and surrounding areas. Methods of controlling these include control of the exposure of a photoconductive surface and defocusing of an incident pattern of electromagnetic radiation. Adjustment of dot size may be used to correct colour balance in multi-colour reproduction, e.g. by the making of lithographic printing plates.
GB379073A 1972-01-28 1973-01-25 Contrast control in electrostatic copying utilizing liquid development Expired GB1406794A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00221669A US3817748A (en) 1972-01-28 1972-01-28 Contrast control in electrostatic copying utilizing liquid development

Publications (1)

Publication Number Publication Date
GB1406794A true GB1406794A (en) 1975-09-17

Family

ID=22828811

Family Applications (1)

Application Number Title Priority Date Filing Date
GB379073A Expired GB1406794A (en) 1972-01-28 1973-01-25 Contrast control in electrostatic copying utilizing liquid development

Country Status (5)

Country Link
US (1) US3817748A (en)
JP (1) JPS4885142A (en)
CA (1) CA991246A (en)
GB (1) GB1406794A (en)
NL (1) NL7300584A (en)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973955A (en) * 1971-03-29 1976-08-10 Genji Ohno Electrostatic developing method
US4023898A (en) * 1972-03-10 1977-05-17 Research And Development Laboratories Of Ohno Co., Ltd. Electrostatic developing apparatus
US4023900A (en) * 1972-03-22 1977-05-17 Xerox Corporation Variable speed liquid development electrostatographics apparatus
JPS4960534A (en) * 1972-10-11 1974-06-12
US4093460A (en) * 1973-09-10 1978-06-06 Weinstein Leonard M Contrast enhancement and small detail blending of photographic images
JPS5442259B2 (en) * 1973-10-09 1979-12-13
US3973953A (en) * 1973-12-28 1976-08-10 Xerox Corporation Imaging method including exposure of photoconductive imaging member through lenticular lens element
US3973954A (en) * 1973-12-28 1976-08-10 Xerox Corporation Imaging method including exposure of photoconductive imaging member through lenticular lens element
US3921580A (en) * 1974-06-12 1975-11-25 Varian Associates Liquid development of electrostatic images
JPS5441419B2 (en) * 1974-07-12 1979-12-08
US3980404A (en) * 1974-07-26 1976-09-14 Xerox Corporation Xerographic apparatus having improved fluid dispensing member
JPS5441502B2 (en) * 1974-10-21 1979-12-08
US3924945A (en) * 1974-12-03 1975-12-09 Xerox Corp Apparatus for inductive imaging with simultaneous polar ink development
US4268597A (en) * 1976-04-13 1981-05-19 Philip A. Hunt Chemical Corp. Method, apparatus and compositions for liquid development of electrostatic images
US4202913A (en) * 1976-04-13 1980-05-13 Philip A. Hunt Chemical Corp. Method for liquid development of latent electrostatic images
US4202620A (en) * 1976-04-13 1980-05-13 Philip A. Hunt Chemical Corp. Apparatus for liquid development of latent electrostatic images
JPS5325436A (en) * 1976-08-20 1978-03-09 Minolta Camera Co Ltd Fine line image reproducing method
US4763370A (en) * 1986-05-30 1988-08-16 Darko Mance Apparatus and method for dyeing sheet articles
US4982692A (en) * 1988-02-16 1991-01-08 Nec Corporation Apparatus for liquid development of electrostatic latent images
US7167666B2 (en) * 2003-08-20 2007-01-23 Seiko Epson Corporation Liquid development device, image forming apparatus, and image forming system

Also Published As

Publication number Publication date
NL7300584A (en) 1973-07-31
JPS4885142A (en) 1973-11-12
CA991246A (en) 1976-06-15
US3817748A (en) 1974-06-18

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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