Three-component varifocal objective

Details Three-component varifocal objective Three-component varifocal objective

1973-10-15

1976-02-10

Smith, Alfred E.

350219, G02B 1500, G02B 960

Patent

active

039375625

ABSTRACT:
A varifocal objective has an axially shiftable positive front component, an axially shiftable negative intermediate component, and a fixed positive rear component or basic lens group. The latter component consists of five closely spaced lens members, all but the second of them singlets and all but the third of them positively refracting. The intermediate component is separated from the rear component by a diaphragm space which in a position of close approach of these components, corresponding to maximum focal length, is still substantially greater than any air space between the lens members of the rear component. With a varifocal ratio close to 3:1, the distance between the front and rear components is the same in the positions of maximum and minimum focal lengths.

REFERENCES:
patent: 3477776 (1969-11-01), Price
patent: 3575495 (1971-04-01), Tibbetts
patent: 3615125 (1971-10-01), Higuchi et al.
patent: 3784283 (1974-01-01), Muszumanski et al.

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