Multi-beam roller phototracer
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United States of America Patent
Stats
-
Jan 31, 1989
Grant Date -
N/A
app pub date -
Aug 14, 1987
filing date -
Aug 20, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The roller phototracer for producing images on photosensitive films inter alia for the manufacture of printed circuits, comprises a film-holding roller movable in rotation and an optics-carrying slide movable in translation along an axis parallel to the axis of the roller, the optics-carrying slide bearing an optical device optically connected to a laser emitter via at least one space filter and at least one acousto-optical modulator for directing a light beam towards the film or switching of the beam in order to light up or extinguish a set of lines of light spots on the film depending on the rotation of the roller and the elementary movements of the slide. The phototracer is characterised in that it also comprises structure for directing a number of light beams towards the film simultaneously and from the same laser emitter, and structure for bringing about a partial overlap of the light spots on the film.
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