Photoplotter focus method

Details Photoplotter focus method Photoplotter focus method

1987-02-24

1988-05-31

Goldberg, E. A.

Recorders

Light or beam recording

Including record receiver or handling means therefor

346 11, 354 4, 356 4, G01D 942, G01D 900, G03B 4100, G01C 308

Patent

active

047484560

ABSTRACT:
A computer controlled photoplotter includes a row of LED's mounted to a light head positioned parallel to the film width. The light head is part of a light head assembly which is moved parallel to the film length. At the end of each pass the light head is indexed widthwise a short distance. During each lengthwise pass the LED's are illuminated at appropriate positions to expose the film at those positions according to the image being plotted. The light head uses cylindrical lenses in which the index of refraction varies radially. The outer lens surfaces are coplanar with the outer surface of the light head facing the film so the light sources have focal points at a common distance from such surface. This permits proper focusing of the photoplotter with different thickness film. The light head is moved until it touches the printing medium and then moved away from the film to obtain the focus desired.

REFERENCES:
patent: 4435055 (1984-03-01), Berdat
patent: 4566015 (1986-01-01), MacKenzie

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