ES421300A1 - Methods of and apparatus for reproducing images by transferring electrostatic charges - Google Patents
Methods of and apparatus for reproducing images by transferring electrostatic chargesInfo
- Publication number
- ES421300A1 ES421300A1 ES421300A ES421300A ES421300A1 ES 421300 A1 ES421300 A1 ES 421300A1 ES 421300 A ES421300 A ES 421300A ES 421300 A ES421300 A ES 421300A ES 421300 A1 ES421300 A1 ES 421300A1
- Authority
- ES
- Spain
- Prior art keywords
- paper
- capacitance
- drums
- belt
- photoconductive belt
- 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
- G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
- G03G15/18—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a charge pattern
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
- Electrophotography Using Other Than Carlson'S Method (AREA)
Abstract
Documents are reproduced on a continuous strip of paper by transferring from a photoconductive belt to the paper an array of electrostatic charges, configured to conform to images on the documents. Both the paper and the photoconductive belt are trained around metallic drums which have identical peripheral speeds. The drums are juxtaposed so that they essentially bring the paper and photoconductive belt into contact along a line lying in a plane whiich is tangent to both drums. When the electrostatic charges on the belt arrive at this line, they are transferred to the paper because there is a potential difference existing between the drums due to corona charging of the drum carrying the photoconductive belt and grounding of the drum carrying the paper. The charges, of course, retain the line configuration of the image as they are transferred from the belt to the paper. The capacitance existing between the drums with the photoconductive belt and paper varies due to environmental conditions, such as temperature and humidity, and varies due to lack of compatibility between the photoconductive layer and the paper. This variation in capacitance causes imperfections in images transferred to the paper. In order to compensate for variations caused by this capacitance, the two drums are connected through a circuit which contains an auxiliary capacitor that has a capacitance at least 100 times greater than the capacitance existing between the drums. Since the capacitance of this auxiliary capacitor is so high, it renders the capacitance existing between the two drums insignificant in relation to the total capacitance thereby, in essence, rendering the capacitance independent of both environmental conditions and incompatibility between the paper and photoconductive belt.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7243711A FR2210302A5 (en) | 1972-12-08 | 1972-12-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES421300A1 true ES421300A1 (en) | 1976-05-01 |
Family
ID=9108395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES421300A Expired ES421300A1 (en) | 1972-12-08 | 1973-12-07 | Methods of and apparatus for reproducing images by transferring electrostatic charges |
Country Status (15)
| Country | Link |
|---|---|
| US (1) | US3928032A (en) |
| JP (1) | JPS5431813B2 (en) |
| AT (1) | AT345094B (en) |
| BE (1) | BE808375A (en) |
| CA (1) | CA1004284A (en) |
| CH (1) | CH578196A5 (en) |
| DE (1) | DE2360843A1 (en) |
| DK (1) | DK134206B (en) |
| ES (1) | ES421300A1 (en) |
| FR (1) | FR2210302A5 (en) |
| GB (1) | GB1433840A (en) |
| IT (1) | IT1000207B (en) |
| NL (1) | NL7316595A (en) |
| SE (1) | SE386749B (en) |
| ZA (1) | ZA739322B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3057275A (en) * | 1958-10-29 | 1962-10-09 | Xerox Corp | Image keeping |
| NL273832A (en) * | 1961-01-24 | |||
| US3281857A (en) * | 1962-01-12 | 1966-10-25 | Xerox Corp | Xerographic transfer platen |
| US3322538A (en) * | 1962-11-30 | 1967-05-30 | Gen Electric | Electrophotographic process |
| US3394002A (en) * | 1964-10-21 | 1968-07-23 | Xerox Corp | Charge transfer with liquid layers |
-
1972
- 1972-12-08 FR FR7243711A patent/FR2210302A5/fr not_active Expired
-
1973
- 1973-11-07 SE SE7315111A patent/SE386749B/en unknown
- 1973-11-21 GB GB5409373A patent/GB1433840A/en not_active Expired
- 1973-12-03 US US421041A patent/US3928032A/en not_active Expired - Lifetime
- 1973-12-04 NL NL7316595A patent/NL7316595A/xx not_active Application Discontinuation
- 1973-12-06 DE DE2360843A patent/DE2360843A1/en active Pending
- 1973-12-06 CH CH1714973A patent/CH578196A5/xx not_active IP Right Cessation
- 1973-12-06 IT IT54125/73A patent/IT1000207B/en active
- 1973-12-07 ES ES421300A patent/ES421300A1/en not_active Expired
- 1973-12-07 AT AT1025273A patent/AT345094B/en not_active IP Right Cessation
- 1973-12-07 DK DK664773AA patent/DK134206B/en unknown
- 1973-12-07 CA CA187,652A patent/CA1004284A/en not_active Expired
- 1973-12-07 ZA ZA739322A patent/ZA739322B/en unknown
- 1973-12-07 BE BE138646A patent/BE808375A/en unknown
- 1973-12-08 JP JP13728873A patent/JPS5431813B2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| IT1000207B (en) | 1976-03-30 |
| NL7316595A (en) | 1974-06-11 |
| GB1433840A (en) | 1976-04-28 |
| CH578196A5 (en) | 1976-07-30 |
| JPS5431813B2 (en) | 1979-10-09 |
| BE808375A (en) | 1974-06-07 |
| ZA739322B (en) | 1974-10-30 |
| FR2210302A5 (en) | 1974-07-05 |
| CA1004284A (en) | 1977-01-25 |
| AU6336073A (en) | 1975-06-12 |
| US3928032A (en) | 1975-12-23 |
| AT345094B (en) | 1978-08-25 |
| DK134206B (en) | 1976-09-27 |
| DE2360843A1 (en) | 1974-06-12 |
| JPS506347A (en) | 1975-01-23 |
| ATA1025273A (en) | 1977-12-15 |
| SE386749B (en) | 1976-08-16 |
| DK134206C (en) | 1977-02-28 |
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