The authors have developed an auto focus function for laser beam scanners to maintain the best focusing condition of the laser spot, which contributes favorably to the quality of halftone images. The focus deviation of the laser beam scanner attributable to variations in the ambient temperature, mechanical vibration, etc., is measured by the auto focus detector and is automatically corrected by the focus adjusting mechanism.

Date Published: 1 August 1991
PDF: 5 pages
Proc. SPIE 1458, Printing Technologies for Images, Gray Scale, and Color, (1 August 1991); doi: 10.1117/12.46345

Published in SPIE Proceedings Vol. 1458:
Printing Technologies for Images, Gray Scale, and Color
Derek B. Dove; Takao Abe; Joachim L. Heinzl, Editor(s)