GB1017682A - Improvements in xerography - Google Patents
Improvements in xerographyInfo
- Publication number
- GB1017682A GB1017682A GB36254/65A GB3625465A GB1017682A GB 1017682 A GB1017682 A GB 1017682A GB 36254/65 A GB36254/65 A GB 36254/65A GB 3625465 A GB3625465 A GB 3625465A GB 1017682 A GB1017682 A GB 1017682A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pattern
- polarity
- tone
- plate
- charge
- 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
- G03G15/04—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
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G13/00—Electrographic processes using a charge pattern
- G03G13/06—Developing
- G03G13/08—Developing using a solid developer, e.g. powder developer
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G13/00—Electrographic processes using a charge pattern
- G03G13/22—Processes involving a combination of more than one step according to groups G03G13/02 - G03G13/20
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G9/00—Developers
- G03G9/08—Developers with toner particles
- G03G9/10—Developers with toner particles characterised by carrier particles
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Developing Agents For Electrophotography (AREA)
- Photoreceptors In Electrophotography (AREA)
- Combination Of More Than One Step In Electrophotography (AREA)
- Wet Developing In Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
- Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
Abstract
1,017,682. Electrophotographic processes. RANK XEROX Ltd. June 12,1962 [June 12, 1961], No. 36254/65. Divided out of 1,017,681. Heading G2H. A method of forming a zerographic reproduction of a pattern of light and shadow comprises forming on a xerographic plate a half-tone image charge pattern and electrostatically depositing finely divided toner particles of opposite polarity on the charge pattern, whereby particles of one polarity deposit on charged image areas and the particles of the other polarity deposits in areas immediately adjacent thereto. A suitable developer composition including toner particles of opposite polarity is described in Specification 1,017,681. A half-tone charge pattern may be produced as described in Specification 1,017,683, Fig. 2, 3, and 4 (all not shown) represent the charge pattern and development with toners of opposite polarity using a coarse, fine and very fine half-tone pattern respectively. A charged plate 10, Fig. 5A, is exposed through a half-tone screen 20 to uniform illumination, thereby producing a charge density pattern, Fig. 5B, on the surface of the plate 10. The plate is then exposed to a light pattern, e.g. a step wedge 21 Fig. 5C (not shown), whereby a charge density pattern Fig. 5D (not shown) is produced. Which upon upon development is a positive-positive reproduction. If desired, the exposure to a light pattern may precede exposure through the half-tone screen. In a modified method negative-positive reproduction, Fig. 6, the half-tone screen 20 is placed above the step wedge transparency 21 and a single exposure is made. Toners of contrasting colour may be used for development. Instead of using a half-tone screen, a xerographic plate having non-photo-sensitive areas may be used. For example, a plate may be formed by printing a pattern of insulating plastic on top of a photoconductive layer. The developed image may be electrostatically transferred to a sheet 17, Fig. 1D, of paper by recharging the deposited toner particles to a single polarity and by reversing the polarity of power supply 14 so effecting transfer to the sheet 17. Alternatively, transfer may be effected by an adhesive method. The transferred image is fixed in each case after transfer.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US116429A US3212888A (en) | 1961-06-12 | 1961-06-12 | Method for developing latent electrostatic charge halftone images |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1017682A true GB1017682A (en) | 1966-01-19 |
Family
ID=22367153
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB36254/65A Expired GB1017682A (en) | 1961-06-12 | 1962-06-12 | Improvements in xerography |
GB19048/62A Expired GB1017681A (en) | 1961-06-12 | 1962-06-12 | Improvements in xerography |
GB36255/65A Expired GB1017683A (en) | 1961-06-12 | 1962-06-12 | Improvements in xerography |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB19048/62A Expired GB1017681A (en) | 1961-06-12 | 1962-06-12 | Improvements in xerography |
GB36255/65A Expired GB1017683A (en) | 1961-06-12 | 1962-06-12 | Improvements in xerography |
Country Status (3)
Country | Link |
---|---|
US (1) | US3212888A (en) |
DE (2) | DE1284302B (en) |
GB (3) | GB1017682A (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3519461A (en) * | 1969-09-02 | 1970-07-07 | Burroughs Corp | Electrostatic dipole printing |
US3808026A (en) * | 1972-03-13 | 1974-04-30 | Xerox Corp | Liquid development of electrostatic latent image |
US4331757A (en) * | 1976-12-29 | 1982-05-25 | Minolta Camera Kabushiki Kaisha | Dry process developing method and device employed therefore |
MX147918A (en) * | 1977-03-31 | 1983-02-02 | Xerox Corp | IMPROVEMENTS IN APPARATUS AND METHOD TO PRODUCE A VISIBLE IMAGE ON A PHOTO CONDUCTIVE IMAGE FORMING SURFACE |
JPS53123135A (en) * | 1977-03-31 | 1978-10-27 | Xerox Corp | Method of marking insulating surface and device for forming visible image on insulating surface |
US4142981A (en) * | 1977-07-05 | 1979-03-06 | Xerox Corporation | Toner combination for carrierless development |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2297691A (en) * | 1939-04-04 | 1942-10-06 | Chester F Carlson | Electrophotography |
US2576047A (en) * | 1948-10-21 | 1951-11-20 | Battelle Development Corp | Method and apparatus for printing electrically |
US2598732A (en) * | 1949-03-09 | 1952-06-03 | Haloid Co | Electrophotography |
US2808328A (en) * | 1950-07-15 | 1957-10-01 | Carlyle W Jacob | Method and apparatus for xerographic reproduction |
US2811465A (en) * | 1952-04-30 | 1957-10-29 | Rca Corp | Electrostatic printing |
US2965573A (en) * | 1958-05-02 | 1960-12-20 | Haloid Xerox Inc | Xerographic developer |
US3010842A (en) * | 1955-08-29 | 1961-11-28 | Xerox Corp | Development of electrostatic images |
NL95463C (en) * | 1955-12-29 | |||
BE558736A (en) * | 1956-06-27 | |||
US3045644A (en) * | 1957-06-06 | 1962-07-24 | Xerox Corp | Two-color electrostatic printing apparatus |
US2940847A (en) * | 1957-07-03 | 1960-06-14 | None i red | |
US3013890A (en) * | 1958-07-08 | 1961-12-19 | Xerox Corp | Process of developing electrostatic images and composition therefor |
US3078231A (en) * | 1959-05-13 | 1963-02-19 | Commw Of Australia | Controlled developer for use in electro-photography and electro-radiography |
-
1961
- 1961-06-12 US US116429A patent/US3212888A/en not_active Expired - Lifetime
-
1962
- 1962-05-16 DE DER32718A patent/DE1284302B/en active Pending
- 1962-05-16 DE DE19621597875 patent/DE1597875A1/en active Pending
- 1962-06-12 GB GB36254/65A patent/GB1017682A/en not_active Expired
- 1962-06-12 GB GB19048/62A patent/GB1017681A/en not_active Expired
- 1962-06-12 GB GB36255/65A patent/GB1017683A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE1284302B (en) | 1968-11-28 |
DE1597875A1 (en) | 1970-09-10 |
GB1017683A (en) | 1966-01-19 |
GB1017681A (en) | 1966-01-19 |
US3212888A (en) | 1965-10-19 |
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