GB1406794A - Contrast control in electrostatic copying utilizing liquid development - Google Patents
Contrast control in electrostatic copying utilizing liquid developmentInfo
- 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
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)
- Control Or Security For Electrophotography (AREA)
- Wet Developing In 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.
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)
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 |
US4202620A (en) * | 1976-04-13 | 1980-05-13 | Philip A. Hunt Chemical Corp. | Apparatus for liquid development of latent electrostatic images |
US4202913A (en) * | 1976-04-13 | 1980-05-13 | Philip A. Hunt Chemical Corp. | Method 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 |
-
1972
- 1972-01-28 US US00221669A patent/US3817748A/en not_active Expired - Lifetime
- 1972-10-30 CA CA155,146A patent/CA991246A/en not_active Expired
-
1973
- 1973-01-15 NL NL7300584A patent/NL7300584A/xx not_active Application Discontinuation
- 1973-01-25 GB GB379073A patent/GB1406794A/en not_active Expired
- 1973-01-29 JP JP48011802A patent/JPS4885142A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
US3817748A (en) | 1974-06-18 |
CA991246A (en) | 1976-06-15 |
NL7300584A (en) | 1973-07-31 |
JPS4885142A (en) | 1973-11-12 |
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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 |