Optical axis correcting system

Details Optical axis correcting system Optical axis correcting system

1999-08-04

2000-10-31

Nguyen, Thong

Optical: systems and elements

Compound lens system

With curved reflective imaging element

359353, 359357, G02B 1700, G02B 1314

Patent

active

061411442

ABSTRACT:
An optical axis correcting system includes a first afocal optical system, an optical deflector which corrects the deviation of an optical axis of light incident upon the first optical system, a second afocal optical system, and a light convergent optical system. The optical axis correcting system satisfies (1) 3.60<.vertline.fp(I)/fN(I).vertline.<5.30, (2) 1.00<.vertline.fp(II)/fN(II).vertline.<2.41, and (3) 0.12 <r1 (II)/f<0.23, wherein fp(I) represents the focal length of a positive lens group of the first optical system, fN(I) represents the focal length of a single negative lens element of the first optical system, fp(II) represents the focal length of a positive lens group of the second optical system, fN(II) represents the focal length of a negative lens group of the second optical system, r1(II) represents the radius of curvature of the surface oif a positive lens element of the second afocal optical system closest to the optical deflector, and f represents the focal length of the whole optical system.

REFERENCES:
patent: 4621888 (1986-11-01), Crossland et al.
patent: 4621890 (1986-11-01), Suzuki et al.
patent: 5055663 (1991-10-01), Morimoto et al.
patent: 5136421 (1992-08-01), Sagan
patent: 5214532 (1993-05-01), Hall et al.
patent: 5936771 (1999-08-01), Cooper

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