GB2021284A - Improved method of electrophotography and apparatus for practicing the same - Google Patents
Improved method of electrophotography and apparatus for practicing the sameInfo
- Publication number
- GB2021284A GB2021284A GB7911785A GB7911785A GB2021284A GB 2021284 A GB2021284 A GB 2021284A GB 7911785 A GB7911785 A GB 7911785A GB 7911785 A GB7911785 A GB 7911785A GB 2021284 A GB2021284 A GB 2021284A
- Authority
- GB
- United Kingdom
- Prior art keywords
- image
- areas
- latent image
- contrast
- photoconductor
- 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.)
- Granted
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
- G03G15/045—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 with means for charging or discharging distinct portions of the charge pattern on the recording material, e.g. for contrast enhancement or discharging non-image areas
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electrophotography Using Other Than Carlson'S Method (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Photoreceptors In Electrophotography (AREA)
- Wet Developing In Electrophotography (AREA)
Abstract
The invention relates to increasing the effective speed of a photoconductor. The charged photoconductor is deliberately imagewise under exposed to provide a weak latent image of low contrast which is insufficient to make a satisfactory copy. The latent image, however, is sufficient in contrast to enable an optical mask or shield to be provided over the image by toning it. The background or non-image areas of the photoconductor are discharged by ins a blanket illumination of low intensity. The optical mask prevents the image areas from discharging while enhancing the contrast of the weak latent image. The enhanced image is easily developed by any known developing method. The means for producing the optical shield or mask is a development station using usual or special development tone is, which may be liquid-carried or be in dry powdered form. A salient feature of the apparatus is the means for applying developer to the weak latent image. This must be biased to a voltage above that of the background areas and below the potential of the image areas. This ensures that the background areas are unmasked or unshielded while the image areas are masked.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US90835578A | 1978-05-22 | 1978-05-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2021284A true GB2021284A (en) | 1979-11-28 |
| GB2021284B GB2021284B (en) | 1982-08-04 |
Family
ID=25425651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7911785A Expired GB2021284B (en) | 1978-05-22 | 1979-04-04 | Method of electrophotography and apparatus for practicing the same |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS554084A (en) |
| CA (1) | CA1129481A (en) |
| DE (1) | DE2920464A1 (en) |
| FR (1) | FR2426930A1 (en) |
| GB (1) | GB2021284B (en) |
| IT (1) | IT1166754B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4278884A (en) * | 1978-11-09 | 1981-07-14 | Savin Corporation | Method and apparatus for xeroradiography |
| DE10301735B4 (en) * | 2003-01-18 | 2007-01-18 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Method and device for metering microscale particles |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2219005A1 (en) * | 1971-04-20 | 1972-12-21 | Iwatsuki Koki Co Ltd | Development process for use in electrophotography |
| US3914609A (en) * | 1974-03-04 | 1975-10-21 | Xerox Corp | Signal amplification by illumination of a partially developed latent electrostatic image |
-
1979
- 1979-04-02 CA CA324,587A patent/CA1129481A/en not_active Expired
- 1979-04-04 GB GB7911785A patent/GB2021284B/en not_active Expired
- 1979-04-19 IT IT22017/79A patent/IT1166754B/en active
- 1979-05-09 JP JP5580179A patent/JPS554084A/en active Granted
- 1979-05-15 FR FR7912355A patent/FR2426930A1/en active Granted
- 1979-05-21 DE DE19792920464 patent/DE2920464A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS554084A (en) | 1980-01-12 |
| IT7922017A0 (en) | 1979-04-19 |
| GB2021284B (en) | 1982-08-04 |
| FR2426930A1 (en) | 1979-12-21 |
| IT1166754B (en) | 1987-05-06 |
| FR2426930B1 (en) | 1985-04-05 |
| JPS6251466B2 (en) | 1987-10-30 |
| DE2920464C2 (en) | 1990-03-08 |
| DE2920464A1 (en) | 1979-11-29 |
| CA1129481A (en) | 1982-08-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |