GB1483400A - Development electrode bias control apparatus - Google Patents
Development electrode bias control apparatusInfo
- Publication number
- GB1483400A GB1483400A GB13269/75A GB1326975A GB1483400A GB 1483400 A GB1483400 A GB 1483400A GB 13269/75 A GB13269/75 A GB 13269/75A GB 1326975 A GB1326975 A GB 1326975A GB 1483400 A GB1483400 A GB 1483400A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrodes
- bias
- development
- area
- control apparatus
- 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
- G03G15/065—Arrangements for controlling the potential of the developing electrode
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Developing For Electrophotography (AREA)
- Wet Developing In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
1483400 Electro-photography SAVIN BUSINESS MACHINES CORP 1 April 1975 [17 June 1974] 13269/75 Heading G2H The bias applied to developing electrodes 72, 74, 76, 78 is adjusted in accordance with a measure of the potential on photo-conductive surface 16, obtained by a separate electrode 64 by conduction through the liquid developer. Preferably the electrode 64 is one of three, 62, 64, 66, arid these are so positioned that one at least measures an unimaged margin area. Circuitry selects the lowest reading from the three electrodes, and the development electrodes are biased accordingly, preferably to an overall bias slightly greater than the potential value sensed in the clear area. When charged and unexposed area 60 passes the electrodes 62, 64, 66, 72, 74, 76, 78 it attracts any toner deposits formed away from them, so that they are ready to sense and develop a further image. Alternatively the drum 10 may include a section with a plastics material coating, or a reverse bias may be applied to the development electrodes.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US479659A US3892481A (en) | 1974-06-17 | 1974-06-17 | Automatic development electrode bias control system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1483400A true GB1483400A (en) | 1977-08-17 |
Family
ID=23904891
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB13269/75A Expired GB1483400A (en) | 1974-06-17 | 1975-04-01 | Development electrode bias control apparatus |
Country Status (7)
Country | Link |
---|---|
US (1) | US3892481A (en) |
JP (1) | JPS6158829B2 (en) |
CA (1) | CA1149154A (en) |
DE (1) | DE2516012A1 (en) |
FR (1) | FR2280117A1 (en) |
GB (1) | GB1483400A (en) |
IT (1) | IT1034714B (en) |
Families Citing this family (40)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4025184A (en) * | 1974-01-21 | 1977-05-24 | Ricoh Co., Ltd. | Developing electrode contamination prevention system for electrophotography |
US4050806A (en) * | 1974-05-10 | 1977-09-27 | Ricoh Co., Ltd. | Method and apparatus for electrically biasing developing electrode of electrophotographic device |
US4129375A (en) * | 1974-05-10 | 1978-12-12 | Ricoh Company, Ltd. | Method and apparatus for electrically biasing developing electrode of electrophotography device |
JPS588507B2 (en) * | 1974-06-10 | 1983-02-16 | 株式会社リコー | Wet developing device |
US4141643A (en) * | 1974-09-13 | 1979-02-27 | Ricoh Company, Ltd. | Developing electrode arrangement for electrophotographic apparatus |
JPS5441502B2 (en) * | 1974-10-21 | 1979-12-08 | ||
DE2550846C2 (en) * | 1974-11-12 | 1983-11-17 | Ricoh Co., Ltd., Tokyo | Developing device for an electrophotographic copier |
JPS5174634A (en) * | 1974-12-24 | 1976-06-28 | Ricoh Kk | Denshishashinno baiasugenzohoho |
JPS5187046A (en) * | 1975-01-28 | 1976-07-30 | Ricoh Kk | Serufuootobaiasushikidenshishashingenzosochi |
JPS5911106B2 (en) * | 1975-04-04 | 1984-03-13 | 株式会社リコー | Auto bias development method |
US3981267A (en) * | 1975-05-20 | 1976-09-21 | Savin Business Machines Corporation | Electrophotographic liquid developing system |
JPS5815789B2 (en) * | 1975-10-01 | 1983-03-28 | 株式会社リコー | Denshisha Shin Fukushi Yakiniokeru Auto Bias Genzohouhou |
JPS5833551B2 (en) * | 1975-10-01 | 1983-07-20 | 株式会社リコー | Denshisha Shin Fukushi Yakiniokeru Auto Bias Genzohouhou |
US4183655A (en) * | 1975-10-07 | 1980-01-15 | Ricoh Company, Ltd. | Cleaning means for image transfer unit in electrophotographic copying machines |
CA1103744A (en) * | 1975-10-14 | 1981-06-23 | Eastman Kodak Company | Electrophotographic apparatus having compensation for rest-run performance variations |
CA1091756A (en) * | 1975-10-14 | 1980-12-16 | Eastman Kodak Company | Electrophotographic apparatus having compensation for changes in sensitometric properties of photoconductors |
JPS5293340A (en) * | 1976-02-02 | 1977-08-05 | Ricoh Co Ltd | Electronic photographic picture adjustment |
JPS6044653B2 (en) * | 1976-05-17 | 1985-10-04 | 株式会社リコー | Developing bias automatic control method and device |
US4044718A (en) * | 1976-09-10 | 1977-08-30 | Xonics, Inc. | Electrostatic fountain developer |
DE2655158C2 (en) * | 1976-12-06 | 1986-04-03 | Hoechst Ag, 6230 Frankfurt | Method and apparatus for developing an electrostatic latent image |
US4244321A (en) * | 1978-02-14 | 1981-01-13 | James River Graphics, Inc. | Electrographic development electrode |
US4266870A (en) * | 1978-03-09 | 1981-05-12 | Ricoh Company, Ltd. | Electrostatographic apparatus comprising developing bias means |
JPS552270A (en) * | 1978-06-21 | 1980-01-09 | Ricoh Co Ltd | Bias device of copying machine |
GB2039101B (en) * | 1978-08-24 | 1983-05-25 | Canon Kk | Control of electrostatic recording apparatus |
USRE30477E (en) * | 1979-05-10 | 1981-01-13 | Savin Corporation | Electrophotographic liquid developing system |
US4373800A (en) * | 1979-12-03 | 1983-02-15 | Ricoh Company, Ltd. | Wet type electrophotographic copying machine |
US4326796A (en) * | 1979-12-13 | 1982-04-27 | International Business Machines Corporation | Apparatus and method for measuring and maintaining copy quality in an electrophotographic copier |
US4669859A (en) * | 1982-03-23 | 1987-06-02 | Ricoh Company, Ltd. | Developing device |
US4678317A (en) * | 1985-11-04 | 1987-07-07 | Savin Corporation | Charge and bias control system for electrophotographic copier |
EP0240042A1 (en) * | 1986-02-25 | 1987-10-07 | Coulter Stork Patents B.V. | Method and device for the development of a latent electrostatic image |
US4843425A (en) * | 1986-09-12 | 1989-06-27 | Konishiroku Photo Industry Co., Ltd. | Image forming method and apparatus |
US4761671A (en) * | 1987-02-02 | 1988-08-02 | Eastman Kodak Company | Electrophotographic subprocess for apparatus using discharged area toning |
JPH0278967U (en) * | 1988-12-05 | 1990-06-18 | ||
US4984019A (en) * | 1990-02-26 | 1991-01-08 | Xerox Corporation | Electrode wire cleaning |
US4957213A (en) * | 1990-03-05 | 1990-09-18 | White Dennis H | Card file stop |
DE4118434C2 (en) * | 1990-06-06 | 1996-01-04 | Mitsubishi Paper Mills Ltd | A method of electrophotographic reversible wet development |
CA2062230C (en) * | 1991-03-04 | 1999-03-09 | Yoshiaki Okano | Electrophotographic printing apparatus capable of printing images by electrophotographic processing and its start-up method |
US5243391A (en) * | 1992-05-01 | 1993-09-07 | Printware, Inc. | Varying an electric field, during development of a latent electrostatic image with developer solution, in proportion to a sensed concentration of toner that is within the developer solution |
JP3013877B2 (en) * | 1995-02-01 | 2000-02-28 | 日本ビクター株式会社 | Method and apparatus for developing electrostatic latent image |
US5748217A (en) * | 1995-11-16 | 1998-05-05 | Phoenix Precision Graphics, Inc. | Charge compensation circuit for an electrostatic writing head |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2956487A (en) * | 1955-03-23 | 1960-10-18 | Rca Corp | Electrostatic printing |
BE755383A (en) * | 1969-08-29 | 1971-03-01 | Xerox Corp | APPARATUS FOR THE CONTROL OF DEVELOPMENT ELECTRODES |
US3654893A (en) * | 1970-05-01 | 1972-04-11 | Eastman Kodak Co | Automatic bias control for electrostatic development |
JPS497014A (en) * | 1972-05-08 | 1974-01-22 | ||
US3788739A (en) * | 1972-06-21 | 1974-01-29 | Xerox Corp | Image compensation method and apparatus for electrophotographic devices |
US3782818A (en) * | 1972-11-17 | 1974-01-01 | Savin Business Machines Corp | System for reducing background developer deposition in an electrostatic copier |
US3815988A (en) * | 1973-05-17 | 1974-06-11 | Xerox Corp | Image density control apparatus |
US3835380A (en) * | 1973-08-14 | 1974-09-10 | Xerox Corp | Electrometer system |
-
1974
- 1974-06-17 US US479659A patent/US3892481A/en not_active Expired - Lifetime
-
1975
- 1975-03-21 CA CA000222749A patent/CA1149154A/en not_active Expired
- 1975-03-28 IT IT21838/75A patent/IT1034714B/en active
- 1975-04-01 GB GB13269/75A patent/GB1483400A/en not_active Expired
- 1975-04-04 FR FR7510654A patent/FR2280117A1/en active Granted
- 1975-04-12 DE DE19752516012 patent/DE2516012A1/en active Granted
- 1975-04-15 JP JP50044879A patent/JPS6158829B2/ja not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE2516012C2 (en) | 1987-08-13 |
US3892481A (en) | 1975-07-01 |
FR2280117B1 (en) | 1977-04-15 |
CA1149154A (en) | 1983-07-05 |
DE2516012A1 (en) | 1976-01-02 |
JPS511144A (en) | 1976-01-07 |
IT1034714B (en) | 1979-10-10 |
JPS6158829B2 (en) | 1986-12-13 |
FR2280117A1 (en) | 1976-02-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |