Gas zoom lens assembly

Details Gas zoom lens assembly Gas zoom lens assembly

1986-11-20

1988-07-19

Corbin, John K.

350255, G02B 106, G02B 312

Patent

active

047580720

ABSTRACT:
A gas zoom lens of the double Gauss type is disclosed. The lens, at a unity magnification setting, has cavities between the outer lens elements filled with a gas under a first pressure and a central cavity filled with the same gas at a second lower pressure. When the lens is moved to alternate magnification positions, its focal length is adjusted by changing the relative pressure, and hence the refractive index of the gas within the cavities, thereby adjusting the focal length of the lens for the particular magnification.

REFERENCES:
patent: 3630519 (1971-12-01), Spear, Jr.
patent: 3640605 (1972-02-01), Sissel
patent: 4331388 (1982-05-01), McCrobie et al.
Rees, "Technique for Varying Focal Length of a Lens", Xerox Disclosure Journal, vol. 1, No. 11/12, Nov./Dec. 1976, pp. 61-62.
Zambelli, S.N. 902,736; filed 9/02/86.

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