Zoom lens system

Details Zoom lens system Zoom lens system

1997-03-04

1999-12-14

Dang, Hung Xuan

Optical: systems and elements

Lens

With variable magnification

359678, 359715, 359686, 359726, 359734, 396384, G02B 1514, G02B 302, G02B 1700

Patent

active

060025263

ABSTRACT:
A zoom lens system that is free from parallax, is compact, and offers excellent optical performance has, from the object side, a positive first lens unit, a negative second lens unit, a positive third lens unit, and a negative fourth lens unit. The zoom lens system has a half-prism between the second lens unit and the third lens unit so that a light beam having passed through the second lens unit is split by reflection.

REFERENCES:
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patent: 3347143 (1967-10-01), Jacobs
patent: 3357775 (1967-12-01), Appledorn et al.
patent: 3547521 (1970-12-01), Ichizuka et al.
patent: 3738733 (1973-06-01), Pettit
patent: 4232943 (1980-11-01), Rogers
patent: 4249798 (1981-02-01), Moskovich
patent: 4265529 (1981-05-01), Yokota
patent: 4730199 (1988-03-01), Ikemori et al.
patent: 4786150 (1988-11-01), Tsuji
patent: 5272565 (1993-12-01), Oshikiri

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