Underwater wide angle zoom lens

Details Underwater wide angle zoom lens Underwater wide angle zoom lens

1992-12-28

1996-02-06

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359684, G02B 1514

Patent

active

054900123

ABSTRACT:
A zoom lens has, in succession from the object side, a first lens unit G1 having an object side surface for contact with water and having a meniscus shape having its convex surface facing the object side and having negative refracting power, a second lens unit G2 having at least two negative lenses and a positive meniscus lens having its convex surface facing the object side and having negative refracting power as a whole, and a third lens unit G3 having at least two positive lenses, a negative lens and two positive lenses disposed on the image side thereof and having positive refracting power as a whole. The first lens unit G1 is fixed relative to the image plane, the second lens unit G2 is moved from the object side toward the image side and the third lens unit G3 is moved from the image side toward the object side to thereby vary the focal length from the wide angle to the telephoto.

REFERENCES:
patent: 5157550 (1992-10-01), Tsuchida et al.
patent: 5325236 (1994-06-01), Tanaka

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