Variable field curvature lens system

Details Variable field curvature lens system Variable field curvature lens system

1978-07-19

1980-11-04

Sacher, Paul A.

350184, 350188, 350226, G02B 916, G02B 1518

Patent

active

042316367

ABSTRACT:
An optical lens system is provided having the capability of selectively varying the peripheral field curvature to improve focusing for nonplanar objects and for special photographic effects. The lens system can include in sequence, a first lens group of positive refractive power, a second lens group of negative refractive power and a third lens group of positive refractive power. The specific refractive power of the first and second lens group are designed so that the optical ray traces from an object on the optical axis at infinity will run approximately parallel with the optical axis in the space between the second and third lens groups. The first and second lens groups being movable as a unit relative to the third lens group to change the field curvature without varying the back focal distance of the lens system.

REFERENCES:
patent: 1865977 (1932-07-01), Sonnefeld
patent: 3782829 (1974-01-01), Herriott
patent: 3904275 (1975-09-01), Noguchi et al.

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