Telecentric f.theta. lens system for laser COM

Details Telecentric f.theta. lens system for laser COM Telecentric f.theta. lens system for laser COM

1988-07-07

1989-11-14

Arnold, Bruce Y.

G02B 1322, G02B 962, G02B 964

Patent

active

048802999

ABSTRACT:
A telecentric f.theta. lens system for use in a laser COM comprising, from the object field side, a first lens unit including at least one negative lens component for generating a large negative distortion, a second lens unit consisting of one or two positive lens components for compensating spherical aberration and astigmatism generated by the first lens unit, a third lens unit including at least one positive lens component for providing a telecentric characteristic and a fourth lens unit including three or four lens components for providing a small F number.

REFERENCES:
patent: 3750189 (1973-07-01), Fleischer
patent: 4518228 (1985-05-01), Sugiura
patent: 4637690 (1987-01-01), Miyamae et al.

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