F(.theta.) Lens system of four-group construction

Details F(.theta.) Lens system of four-group construction F(.theta.) Lens system of four-group construction

1981-06-08

1983-08-23

Corbin, John K.

350 68, 350 691, G02B 300, G02B 2717

Patent

active

044000634

ABSTRACT:
This specification discloses an f.theta. lens system having an entrance pupil at a remote position on the incident light side of the lens system and having such a negative distortion that the image height H of a parallel light beam incident at an angle .theta. with respect to the optical axis with the entrance pupil as the center is H=f.theta., where f is the focal length of the entire system. The lens system includes, in succession from the entrance pupil side, a first group having at least one negative lens and having a composite negative refractive power, a second and a third group each having a meniscus lens component having its concave surface facing the entrance pupil side, and a fourth group having at least one positive lens and having a composite positive refractive power.

REFERENCES:
patent: 3687025 (1972-08-01), Rosin
patent: 3973833 (1976-08-01), Lawson

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