Electric heating – Metal heating – By arc
Patent
1975-10-08
1977-09-06
Truhe, J. V.
Electric heating
Metal heating
By arc
219121L, B23K 900
Patent
active
040469867
ABSTRACT:
A surface in relief is formed by scanning coherent radiation over a surface defined by a thin film supported upon a plastic substrate. The wave length of the coherent radiation is chosen so that it is absorbed by the film and hence removes portions of the film exposing the substrate. The coherent radiation for removing the film may be switched on and off or otherwise modified so as to write information on the surface. Thereafter, the surface is again scanned by coherent radiation of a wave length that is reflected by the film but absorbed by the plastic substrate thereby removing portions of the plastic exposed by the coherent radiation. The film may or may not then be completely removed leaving a pattern in relief upon the surface of the substrate.
REFERENCES:
patent: 1803548 (1931-05-01), Drake
patent: 3181170 (1965-04-01), Akin
patent: 3293652 (1966-12-01), Roshon, Jr. et al.
patent: 3435186 (1969-03-01), Roshon, Jr. et al.
patent: 3506779 (1970-04-01), Brown et al.
patent: 3549733 (1970-12-01), Caddell
patent: 3560291 (1971-02-01), Foglia et al.
patent: 3588440 (1971-06-01), Morse
"Laser-Etched Printing Plates May Soon Be A Reality" by W. T. Reid, Inland Printer/American Lithographer, vol. 154, No. 3, 12-1964, pp. 57 & 113.
Applied Display Services, Inc.
Bell Fred E.
Truhe J. V.
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