Variable-magnification telecentric optical system

Details Variable-magnification telecentric optical system Variable-magnification telecentric optical system

1996-12-27

1998-09-08

Sugarman, Scott J.

Optical: systems and elements

Lens

Telecentric system

359679, 359690, G02B 1322, G02B 1514

Patent

active

058053476

ABSTRACT:
Lens systems are disclosed each of which providing a variable magnification telecentric optical system in which lateral magnification can be varied while maintaining constant image position and telecentricity. The lens system comprises, from the object side, first, second, and third lens groups disposed on an optical axis. The first and third lens groups each have positive refractive power. The second lens group is afocal. While varying the lateral magnification, the object and image positions remain fixed and telecentricity of the lens system (on both the object and image sides) is maintained. Lateral magnification is varied by axially moving lenses in one or more of the first, second, and third lens groups.

REFERENCES:
patent: 4867545 (1989-09-01), Wakimoto et al.
patent: 5118957 (1992-06-01), Kawashima et al.
patent: 5218415 (1993-06-01), Kawashima
patent: 5414561 (1995-05-01), Wakimoto et al.
patent: 5416562 (1995-05-01), Ota et al.
patent: 5510892 (1996-04-01), Mizutani et al.
patent: 5633721 (1997-05-01), Mizutani

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