ATE4435T1 - METHOD FOR IMPROVING THE MAXIMUM DENSITY AND TONE RANGE OF ELECTROGRAPHIC IMAGES AND ELECTROGRAPHIC COPY MACHINE FOR CARRYING OUT THE METHOD. - Google Patents
METHOD FOR IMPROVING THE MAXIMUM DENSITY AND TONE RANGE OF ELECTROGRAPHIC IMAGES AND ELECTROGRAPHIC COPY MACHINE FOR CARRYING OUT THE METHOD.Info
- Publication number
- ATE4435T1 ATE4435T1 AT80301189T AT80301189T ATE4435T1 AT E4435 T1 ATE4435 T1 AT E4435T1 AT 80301189 T AT80301189 T AT 80301189T AT 80301189 T AT80301189 T AT 80301189T AT E4435 T1 ATE4435 T1 AT E4435T1
- Authority
- AT
- Austria
- Prior art keywords
- electrographic
- maximum density
- improving
- carrying
- images
- Prior art date
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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electrophotography Using Other Than Carlson'S Method (AREA)
- Combination Of More Than One Step In Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
- Photoreceptors In Electrophotography (AREA)
- Liquid Crystal (AREA)
- Paper (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The image quality obtainable by an electrographic copying process in which an electrostatic latent image formed by imagewise exposure of a uniformly charged photoconductive layer, or otherwise, is developed with a toner can be improved if the latent image comprises discrete charge bearing zones, preferably formed by a supplementary exposure through a half-tone screen, and if additionally the toner is electrically conductive either intrinsically or as a result of electrical break-down. In this manner, the maximum density obtainable in a copy can be increased and the contrast decreased sufficiently to allow good reproduction of both continuous tone and high contrast images.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US3066879A | 1979-04-16 | 1979-04-16 | |
EP80301189A EP0018742B2 (en) | 1979-04-16 | 1980-04-15 | Method of improving maximum density and tonal range of electrographic images and an electrographic copying apparatus using the method |
Publications (1)
Publication Number | Publication Date |
---|---|
ATE4435T1 true ATE4435T1 (en) | 1983-08-15 |
Family
ID=21855368
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT80301189T ATE4435T1 (en) | 1979-04-16 | 1980-04-15 | METHOD FOR IMPROVING THE MAXIMUM DENSITY AND TONE RANGE OF ELECTROGRAPHIC IMAGES AND ELECTROGRAPHIC COPY MACHINE FOR CARRYING OUT THE METHOD. |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0018742B2 (en) |
JP (1) | JPS5619067A (en) |
AT (1) | ATE4435T1 (en) |
AU (1) | AU536674B2 (en) |
BR (1) | BR8002337A (en) |
DE (2) | DE3014449C2 (en) |
FR (1) | FR2454646A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL8400922A (en) * | 1984-03-23 | 1985-10-16 | Oce Nederland Bv | METHOD FOR MAKING COPIES. |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2598732A (en) * | 1949-03-09 | 1952-06-03 | Haloid Co | Electrophotography |
DE1175985B (en) * | 1959-11-05 | 1964-08-13 | Agfa Ag | Process for making electro-photographic images |
US3337339A (en) * | 1962-10-01 | 1967-08-22 | Xerox Corp | Screen xerography |
NL298605A (en) * | 1962-10-01 | |||
US3335003A (en) * | 1963-10-09 | 1967-08-08 | Xerox Corp | Reflex xerographic process |
US3627526A (en) * | 1969-12-29 | 1971-12-14 | Rca Corp | Electrophotographic recording elements with half-tone screen coatings thereon |
US3681071A (en) * | 1970-01-02 | 1972-08-01 | Rca Corp | Method of pressure treating electrophotographic recording elements to change their sensitivity to light |
ZA73911B (en) * | 1972-03-15 | 1973-11-28 | Minnesota Mining & Mfg | Electrographic development process |
US3905822A (en) * | 1973-10-23 | 1975-09-16 | Xerox Corp | Compound screen for object screening |
US4051536A (en) * | 1975-03-14 | 1977-09-27 | Xerox Corporation | Electronic halftone imaging system |
US4083632A (en) * | 1976-04-05 | 1978-04-11 | Xerox Corporation | Multi-frequency screen |
JPS52143826A (en) * | 1976-05-26 | 1977-11-30 | Mita Industrial Co Ltd | Electric recording method |
US4076857A (en) * | 1976-06-28 | 1978-02-28 | Eastman Kodak Company | Process for developing electrographic images by causing electrical breakdown in the developer |
-
1980
- 1980-04-15 AT AT80301189T patent/ATE4435T1/en not_active IP Right Cessation
- 1980-04-15 DE DE3014449A patent/DE3014449C2/en not_active Expired
- 1980-04-15 FR FR8008381A patent/FR2454646A1/en active Granted
- 1980-04-15 EP EP80301189A patent/EP0018742B2/en not_active Expired
- 1980-04-15 BR BR8002337A patent/BR8002337A/en unknown
- 1980-04-15 DE DE8080301189T patent/DE3064518D1/en not_active Expired
- 1980-04-16 AU AU57518/80A patent/AU536674B2/en not_active Ceased
- 1980-04-16 JP JP4924380A patent/JPS5619067A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
AU536674B2 (en) | 1984-05-17 |
JPH0210954B2 (en) | 1990-03-12 |
EP0018742B2 (en) | 1988-08-24 |
DE3014449C2 (en) | 1986-03-27 |
EP0018742B1 (en) | 1983-08-10 |
AU5751880A (en) | 1980-10-23 |
DE3064518D1 (en) | 1983-09-15 |
BR8002337A (en) | 1980-12-02 |
FR2454646A1 (en) | 1980-11-14 |
FR2454646B1 (en) | 1983-12-09 |
DE3014449A1 (en) | 1980-10-30 |
EP0018742A1 (en) | 1980-11-12 |
JPS5619067A (en) | 1981-02-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
UEP | Publication of translation of european patent specification | ||
UEP | Publication of translation of european patent specification | ||
REN | Ceased due to non-payment of the annual fee |