Variable focal length objective

Details Variable focal length objective Variable focal length objective

1986-06-23

1989-06-27

Arnold, Bruce Y.

350413, 350423, 350426, G02B 1500, G02B 1516, G02B 1514

Patent

active

048423866

ABSTRACT:
A variable focal length objective having a plurality of lens units with at least one unit separation being varied to vary the focal length of the entire system, in which at least one of the plurality of lens units has at least gradient-index lens having a refractive index distribution of the form: N(h)=N.sub.0 +N.sub.1 h.sup.2 +N.sub.2 h.sup.4 +N.sub.3 h.sup.6 + . . . where h is the height from the optical axis, N.sub.0 is the refractive index on the optical axis, and N.sub.1, N.sub.2, N.sub.3, . . . are constants, satisfying the following conditions:

REFERENCES:
patent: 4457590 (1984-07-01), Moore
patent: 4571032 (1986-02-01), Someya et al.
patent: 4730906 (1988-03-01), Okudaira
Introduction to Classical and Modern Optics, Jurgen R. Meyer-Arendt, M.D., 1984, Prentice-Hall, Inc. pp. 362-365.
Gradient-index wide-angle Photographic objective design, Atkinson et al., Applied Optics, Jun. 1984, vol. 23, No. 11, pp. 1735-1741.
Design of a gradient-index photographic objective, Atkinson et al, Applied Optics, Mar. 1982, vol. 21, No 6, pp. 993-998 Camera International, Apr. 1965, No. 4, pp. 36-37.

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