Camera objective of variable focal length

Details Camera objective of variable focal length Camera objective of variable focal length

1976-12-03

1978-05-02

Clark, Conrad J.

350207, G02B 1518

Patent

active

040871606

ABSTRACT:
A varifocal forward lens group of a camera objective, with a pair of axially shiftable negative components bracketed by a pair of substantially fixed positive components, has its negative third component more widely separated from its positive fourth component in a wide-angle position of minimum overall focal length than in a telephoto position of maximum overall focal length. The effective diameter of that third component is just large enough to let a bundle of axially incident light rays fully illuminate the fourth component in the wide-angle position, with less than full illumination in the telephoto position. The positive first component is also just large enough to provide full illumination of the effective area of the third component by axial rays in the telephoto position.

REFERENCES:
patent: 3433559 (1969-03-01), Vockenhuber et al.
patent: 3918797 (1975-11-01), Takano
patent: 3918798 (1975-11-01), Takano

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