Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1987-08-14
1989-01-31
Goldberg, E. A.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
346 76L, 358302, G01D 942
Patent
active
048019500
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.
REFERENCES:
patent: 4513326 (1985-04-01), Kokaji
patent: 4547814 (1985-10-01), Hirosawa
"Laser Pattern Generator for Printed Circuit Artwork", Transactions of the nstitute of Metal Finishing, vol. 60, No. 4, by H. R. Shemilt, 1982, pp. 137-140.
"High--Speed Facsimile Recording with Laser Light Sources", IEEE Transactions on Communications, vol. COM-20, No. 1, by Akira Fukumoto et al., Feb. 1972, p. 23-27.
Goldberg E. A.
Societe d'Etudes et de Constructions de Machines et Appareils In
Tran Huan H.
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