G - Physics – 06 – F
Patent
G - Physics
06
F
G06F 3/13 (2006.01) B41J 2/465 (2006.01) H04N 1/195 (2006.01)
Patent
CA 2276972
A computer-stored raster image is plotted field-wise a manner analogous to the structure of a chessboard by means of an exposure head which is continuously displaceable relative to a light-sensitive record carrier and containing a light modulator. Through the sustained relative movement the plotting would turn out to be undesirably blurred in the case of a longer exposure period. This blurred effect is compensated by the displacement of a lens determining a focussing scale and which is positioned between record carrier and exposure head. Prior to plotting of a new field the displaced lens is retracted into a relative starting position for the new field so as to be displaced compensatively during the next exposure period. This process allows almost continuous exposure with high plotting energy, particularly through the usage of mercury arc lamps and thus also direct exposure of photo-resist material, such as that used in the manufacture of printed circuit boards.
Mcfadden Fincham
Mivatec Hard- Und Software Gmbh
LandOfFree
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