F.theta. lens

Details F.theta. lens F.theta. lens

1994-02-25

1997-12-02

Nelms, David C.

Optical: systems and elements

Lens

High distortion lens

359206, G02B 300, G02B 2608, G02B 900

Patent

active

056942516

ABSTRACT:
An f.theta. lens includes first and second lens groups arranged in this order from the entrance pupil side. The first lens group consists of a first lens having a negative or positive refracting power. The second lens group consists of a second lens having a positive refracting power and a third lens having a negative refracting power with the second and third lenses being cemented together. The second lens group has a positive refracting power as a whole. The following formulae (1) to (4) are satisfied.

REFERENCES:
patent: 3973833 (1976-08-01), Lawson
patent: 4179183 (1979-12-01), Tateoka et al.
patent: 4863250 (1989-09-01), Ishizuka
patent: 5085350 (1992-02-01), Nishihata
patent: 5087987 (1992-02-01), Simbal
patent: 5111325 (1992-05-01), De Jager
patent: 5200861 (1993-04-01), Moskovich
patent: 5270851 (1993-12-01), Makino et al.
Patent Abstracts of Japan vol. 15, No. 265 (E-1086) Jul. 5, 1991 and JP-A-03088576 (Brother Ind) Apr. 12, 1991 *abstract.
Patent Abstracts of Japan, vol. 17, No. 360 (P-1569), Jul. 7, 1993 (JP-A-05 053 051, Mar. 5, 1993).
Patent Abstracts of Japan, vol. 15, No. 281 (P-1228), Jul. 17, 1991(JP-A-03 096 936, Apr. 22, 1991).

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