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Title:
LITHOGRAPHY PLATES AND METHOD AND MEANS FOR IMAGING THEM
Document Type and Number:
WIPO Patent Application WO1990002044
Kind Code:
A3
Abstract:
A method of imaging a lithographic plate having a printing surface comprising mounting a plate to the plate cylinders of a lithographic press having at least two plate cylinders, a corresponding number of blanket cylinders and an impression cylinder, exposing the printing surface to spark discharges between each plate and an electrode spaced close to the printing surface produced in response to picture signals, the spark discharges producing sufficient heat to change the affinity of each printing surface for printing liquid at the points thereof exposed to the spark discharges thereby producing image spots on each plate corresponding to the picture signals, moving the electrode relative to the plate to effect a scan of the printing surface, and controlling the spark discharges to the plate in accordance with picture signals so that they occur at selected points in the scan so as to form an image of the original document on the printing surface. Imaging apparatus is also disclosed.

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Inventors:
LEWIS THOMAS E (US)
DAVIDSON BRADLEY W (US)
WILLIAMS RICHARD A (US)
NOWAK MICHAEL T (US)
KLINE JOHN F (US)
Application Number:
PCT/US1989/003558
Publication Date:
August 23, 1990
Filing Date:
August 18, 1989
Export Citation:
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Assignee:
PRESSTEK INC (US)
International Classes:
B41C1/04; B41C1/10; B41F7/02; B41N1/14; (IPC1-7): B41C1/10
Foreign References:
EP0101266A21984-02-22
US4082902A1978-04-04
FR1560414A1969-03-21
US3113512A1963-12-10
EP0158826A21985-10-23
DE2511734A11975-09-25
DE2734508A11978-02-02
FR938220A1948-09-08
US0748004A1903-12-29
GB475902A1937-11-29
US2119031A1938-05-31
DE806315C1951-06-14
FR1154639A1958-04-14
EP0022033A11981-01-07
FR1158174A1958-06-11
US4081572A1978-03-28
FR1264233A1961-06-19
FR2366134A11978-04-28
US3368483A1968-02-13
US2764085A1956-09-25
US2951441A1960-09-06
EP0200488A21986-11-05
DE1054323B1959-04-02
EP0039383A21981-11-11
US4488158A1984-12-11
GB1160435A1969-08-06
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