Multispot polygon ROS with maximized line separation depth of fo

Details Multispot polygon ROS with maximized line separation depth of fo Multispot polygon ROS with maximized line separation depth of fo

1994-11-21

1996-08-27

Dzierzynski, Paul M.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359206, 359207, 359212, 347233, 347244, G02B 2608

Patent

active

055506682

ABSTRACT:
The present invention is a method and apparatus for improving the depth of focus in a raster output scanner (ROS), and more particularly to a system for maximizing the line separation depth of focus of a multispot ROS while maintaining the system common depth of focus. In a preferred design for a ROS-based system, the system common depth of focus (system common DOF) is maximized, where the system common DOF is characterized as the depth-of-focus over which all performance parameters are met. More specifically, the performance parameters are intended to include the following five factors: (1) scan and cross-scan spot size; (2) wobble; (3) differential bow; (4) line separation; and (5) scan linearity. Maximizing the system common DOF means to maximize the depth-of-focus while at all times meeting or exceeding the performance requirements for the five listed parameters. The optical system design achieves a desirable system common DOF while maintaining a line separation of 127 .mu.m (1/200 inch).

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"Self-Focusing ROS,"Xerox Disclosure Journal, vol. 18, No. 2, (Mar./Apr. 1993), pp. 151-152.

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