Preparation of gravure printing surfaces

Details Preparation of gravure printing surfaces Preparation of gravure printing surfaces

1976-01-21

1977-03-29

Moskowitz, Nelson

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

346108, 219121L, 350159, 358297, H01S 310, H04N 108

Patent

active

040152219

ABSTRACT:
In apparatus for excavating material from a gravure cylinder surface, for example, by means of a laser beam, the polarization of the laser beam is modulated and the modulated beam is then passed through a polarization analyzer system to a focusing lens which focuses light on to the surface to be excavated. The polarization analyzing system includes an aperture through which a central portion of the laser beam passes, regardless of its polarization the extent to which the remainder of the beam is transmitted by the analyzer depending upon its polarization modulation. The effect of the aperture is to reduce variation in excavation width with the intensity of the beam.

REFERENCES:
patent: 3368209 (1969-02-01), McGlauchlin et al.
patent: 3558208 (1971-01-01), Hudson
patent: 3636251 (1972-01-01), Daly et al.
patent: 3787888 (1974-01-01), Haskal

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