Accession Number : AD0651925

Title :   CONTACT PRINTING WITH COHERENT LIGHT.

Descriptive Note : Final rept., 7 Apr-30 Sep 66,

Corporate Author : TECHNICAL OPERATIONS INC BURLINGTON MASS

Personal Author(s) : Bouche,Edmund L. ; Servaes,Donald A.

Report Date : MAR 1967

Pagination or Media Count : 83

Abstract : Investigation of coherent light printing included the consideration of both beam swinging and fixed illumination systems, and the latter was chosen for use on the modified Kodak Concord continuous contact printer. A technique was adopted whereby a cylindrical glass rod was used as both pressure roller and optical element, permitting good line contact and eliminating interference patterns. A 5.9mm focal length planoconvex lens fans out the laser beam in one direction while the glass rod converges the fanned-out beam to a line at the printing platen. The GFE printer was modified to use a 1W Raytheon LG-12 Argon ion laser as a light source. As the laser is operated at full power, a glass wedge, of the type used on Joyce-Loebl densitometer, is used to attenuate the beam to prevent burning. The spectral response of several films relative to the lines present in the Argon laser was determined so that SO 242 should be 2.2 times more sensitive than SO 8430 and that 3404 should be 22 times more sensitive than SO 8430. Evaluation of results demonstrated that resolutions higher than those specified for the films by their manufacturer can be recorded with the coherent printer. (Author)

Descriptors :   (*CONTACT PRINTERS, *LASERS), COHERENT RADIATION, PHOTOGRAPHIC PRINTERS, ARGON, GAS LASERS, SENSITIVITY, PERFORMANCE(ENGINEERING), RESOLUTION, SCANNING, RESPONSE

Subject Categories : Photography

Distribution Statement : APPROVED FOR PUBLIC RELEASE