Variable focal length lens system

Details Variable focal length lens system Variable focal length lens system

1989-08-23

1991-03-12

Sugarman, Scott J.

350413, 350450, G02B 1514

Patent

active

049988077

ABSTRACT:
A variable focal length lens system comprising a plurality of lens units, arranged with an imaging lens unit with a positive refractive power being located at the image side, and at least one lens unit being movable to change an airspace for varying focal length. The positive lens unit for image formation is made of at least one radial GRIN lens, arranged to distribute a stop at the object side of said lens unit. By utilizing a lesser numbers of lenses, it is possible for this vari-focal lens to have simpler processing, assembly, and adjustment of lenses and lens burrels with an efficient performance.

REFERENCES:
patent: 4571032 (1986-02-01), Someya et al.
patent: 4730906 (1988-03-01), Okudaira
patent: 4806079 (1990-06-01), Mihara et al.

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