Gas zoom lens

Details Gas zoom lens Gas zoom lens

1980-02-25

1982-05-25

Corbin, John K.

G02B 106, G02B 312

Patent

active

043313884

ABSTRACT:
A multi-element lens is provided having a central cavity containing a heavy, high index gas. The central cavity is defined by a pair of meniscus elements and acts as a thick positive lens. The pressure of the gas in the cavity is varied in response to magnification changes desired, the pressure change causing a change in the refractive index of the gas thereby altering the focal length of the lens.

REFERENCES:
patent: 3355235 (1967-11-01), Berreman
patent: 3364816 (1968-01-01), Jeffree
patent: 3498695 (1970-03-01), Brouwer
patent: 3528727 (1970-09-01), Halliday
Rees, J. D.; "Technique for Varying Focal Length of a Lens"; Xerox Disclosure Bulletin; vol. 1, No. 11/12; Nov./Dec. 1976; pp. 61-62.

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