Recorders – Thermal recording
Patent
1975-09-29
1976-08-10
Miller, Jr., George H.
Recorders
Thermal recording
346108, 331 945D, 178 66B, G01D 1510, G01D 942, H01S 300, H04N 100
Patent
active
039745074
ABSTRACT:
In a micrographics system of the type in which holes are machined in a thin film by means of a laser (see, for example, reissue U.S. Pat. No. 28,375 of D. Maydan, M. I. Cohen and R. E. Kerwin, granted Mar. 25, 1975), it is advantageous that the laser be a solid-state unit of the stripe-geometry double-heterostructure type. But the optical output beam of such a laser typically exhibits astigmatism and an elliptical cross-section. To assure high-quality machining of the film, it is important that the astigmatic nature of the beam be corrected and, in addition, that the beam be converted to one having a circular cross-section. As described herein, this is accomplished by means of an inexpensive and easily adjustable compact array of optical components that are relatively insensitive to beam-steering and to certain filamentation effects that may occur in the laser.
REFERENCES:
patent: 3396344 (1968-08-01), Broom
patent: 3656175 (1972-04-01), Carlson et al.
patent: 3736046 (1973-05-01), Zook
patent: 3866238 (1975-02-01), Monroe
Watson, Hugh A., "An Experimental Page Facsimile System," Bell Laboratories Record, Mar. 1975, pp. 163-169.
Chemelli Robert Guido
Miller Richard Carrel
Bell Telephone Laboratories Incorporated
Canepa L. C.
Miller Jr. George H.
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