Zoom lens system

Details Zoom lens system Zoom lens system

1997-01-21

1999-02-09

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359740, G02B 1514

Patent

active

058702300

ABSTRACT:
A zoom lens system has a first lens unit located closest to an object side and moves in an optical axis direction during both zooming and focusing and a light shielding plate which moves in a same direction and by same amount as the first lens unit during zooming, while the light shielding plate being stationary during focusing. As a result, adequate light is secured for peripheral areas when the lens system is in focus on a close-range object and the occurrence of flaring is prevented when the lens system is in focus on an object located at infinity.

REFERENCES:
patent: 3918798 (1975-11-01), Takano
patent: 4432615 (1984-02-01), Ikemori
patent: 4516839 (1985-05-01), Tokumaru
patent: 4623226 (1986-11-01), Fujii
patent: 5283693 (1994-02-01), Kohno et al.

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