Zooming lens

Details Zooming lens Zooming lens

2006-07-11

2006-07-11

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000, C359S691000

Reexamination Certificate

active

07075729

ABSTRACT:
A zooming lens is suitable for projecting images produced by a display device onto a screen. The zooming lens includes a first set of lenses and a second set of lenses, wherein the second set of lenses is disposed in the optical path between the first set of lenses and the display device. The first set of lenses includes first lens, second lens, third lens, and fourth lens sequentially, and the fourth lens is adjacent to the second set of lenses. The second set of lenses includes fifth lens, sixth lens, seventh lens, and composite lens sequentially, and the composite lens is adjacent to a side of the display device. The optical focusing of the lenses, from the first one through the seventh and to the composite lens, are positive, negative, negative, positive, positive, negative, positive value and positive, respectively. The composite lens includes two optical lenses.

REFERENCES:
patent: 5936780 (1999-08-01), Chuang et al.

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