Two-mirror scanner with pincushion error correction

Details Two-mirror scanner with pincushion error correction Two-mirror scanner with pincushion error correction

1990-07-06

1991-09-17

Ben, Loha

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

346108, 358474, 359206, 359213, 359221, G02B 2608

Patent

active

050489046

ABSTRACT:
A two-dimensional scanner employs first and second pivotable mirrors (36 and 40) to control the position of the target point that a light spot assumes in a target phase (44). The second mirror (40) is driven in a resonant mode. An f.multidot..theta. lens (42) converts the pincushion error that would otherwise result into a barreling error, which can be compensated for by controlling the amplitude of the second-mirror oscillations.

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patent: 4685775 (1987-08-01), Goodman et al.
patent: 4816920 (1989-03-01), Paulsen
"Two-Mirror, Two-Axis, Rapid Frame Rate Galvanometer Scanning Using a Novel Resonant Scanner/Dynamic Focusing Mechanism", A. C. Mecklenburg, 536-542, SPIE Bol. 767 Medical Imaging (1987).
"Precision, Post-Objective, Two-Axis, Galvanometer Scanning," Pelsue, Reprint from Proceedings of SPIE, vol. 390, pp. 70-78 (1983).
"Galvanometric and Resonant Low Inertia Scanners," Montagu, pp. 34-42.

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