Wide-angle projection zoom lens

Details Wide-angle projection zoom lens Wide-angle projection zoom lens

1998-10-14

2000-01-04

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359686, 359680, 359676, G02B 1514

Patent

active

060116560

ABSTRACT:
A wide-angle zoom lens includes four sets of lenses. The first set of lenses has a negative effective focal length. The second set of lenses has a positive effective focal length for changing the focal length of the wide-angle zoom lens. The third set of lenses has a negative effective focal length for changing the focal length of the wide-angle zoom lens, as well. The fourth set of lenses has a positive effective focal length. The focal length of the wide-angle zoom lens can be changed by changing the positions of the second set of lenses and the third set of lenses along the optical axis of the wide-angle zoom lens.

REFERENCES:
patent: 5627681 (1997-05-01), Tsay
patent: 5914820 (1999-06-01), Takimoto et al.
patent: 5936780 (1999-08-01), Chuang et al.

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