Lens system for optical beam scanner

Details Lens system for optical beam scanner Lens system for optical beam scanner

1989-12-18

1991-05-28

Arnold, Bruce Y.

350 65, 350465, 350469, G02B 2608, G02B 960, G02B 934

Patent

active

050188070

ABSTRACT:
The present invention is directed to a lens system for an optical beam scanner which scans a plurality of optical beams. The lens system comprises: a first lens group having an entrance pupil, which includes first and third lenses in the form of meniscus having a positive power, respectively, a fourth lens having a positive power, and a second lens having a negative power; and a second lens group including a fifth lens having a positive power. The first to fifth lenses are successively disposed in order from the entrance pupil side. Accordingly, the lens system has a telecentric and an f-sin.theta. characteristic.

REFERENCES:
patent: 4269478 (1981-05-01), Maeda et al.
patent: 4861983 (1989-08-01), Sasada et al.
patent: 4882483 (1989-11-01), Mochizuki et al.
patent: 4930850 (1990-06-01), Morimoto

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