Large-aperture three-lens objective with aspherical-surfaces

Details Large-aperture three-lens objective with aspherical-surfaces Large-aperture three-lens objective with aspherical-surfaces

1992-10-16

1993-10-05

Lerner, Martin

Optical: systems and elements

Having significant infrared or ultraviolet property

Lens, lens system or component

359356, 359709, 359716, 359785, G02B 914, G02B 1314, G02B 1318

Patent

active

052510638

ABSTRACT:
A three-lens objective has the following characteristics: A front lens consists of a first material of relatively low dispersion, a median lens consists of a second material of relatively larger dispersion, and a rear lens consists of a material of relatively low dispersion. The front lens has positive power, the median lens has negative power, and the rear lens has positive power. The spacing between front lens and median lens is substantially smaller than the distance between median lens and rear lens. Each of the lenses has at least one aspherical surface.

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patent: 3944337 (1976-03-01), Ruben
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patent: 5044706 (1991-09-01), Chen
patent: 5202792 (1993-04-01), Rollin
J. Kross and R. Schuhmann, "Zur Korrektion optischer Systeme mit aspharischen Flachen" in Optik, vol. 70 (1985), pp. 76-85.

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