Optical system utilizing a transversely movable plate for focusi

Details Optical system utilizing a transversely movable plate for focusi Optical system utilizing a transversely movable plate for focusi

1981-12-03

1984-07-03

Corbin, John K.

350465, G02B 960, G02B 1318

Patent

active

044575920

ABSTRACT:
A five element photographic objective including four elements fixed in a generally symmetric arrangement and a transversely movable refracting plate of preferred shape for maintaining the focal setting of the objective over a large range of object distances. One of the four fixed elements and the refracting plate each include at least one surface whose shape is in a nonrotational aspheric and mathematically describable by a polynomial of at least fifth order.

REFERENCES:
patent: 3305294 (1967-02-01), Alvarez
patent: 3507565 (1970-04-01), Alvarez et al.
patent: 3583790 (1971-06-01), Baker
patent: 3617116 (1971-11-01), Jones
patent: 3632696 (1972-01-01), Jones
patent: 3751138 (1973-08-01), Humphrey
patent: 3758201 (1973-09-01), MacNeille
patent: 3827798 (1974-08-01), Alvarez

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