Zoom lens

Details Zoom lens Zoom lens

1992-06-03

1993-10-26

Lerner, Martin

Optical: systems and elements

Lens

With variable magnification

359684, 359690, 359786, 359787, 359788, G02B 1514, G02B 914

Patent

active

052571343

ABSTRACT:
A zoom lens for the projector includes, in order from a screen, a first lens unit of positive refractive power, a second lens unit of negative refractive power and a third lens unit of positive refractive power, zooming from the wide-angle end to the telephoto end being performed by axially moving the second and third lens units in such a manner that the air separation between the first and second lens unit increases, while the air separation between the second and third lens units decreases, and the following conditions being satisfied:

REFERENCES:
patent: 4118108 (1978-10-01), Muszumanski
patent: 4478496 (1984-10-01), Kato
patent: 5103343 (1992-04-01), Sekita
patent: 5134524 (1992-07-01), Hamano et al.

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