Zoom objective, especially for a projector

Details Zoom objective, especially for a projector Zoom objective, especially for a projector

1976-08-10

1978-10-03

Clark, Conrad J.

G02B 1514

Patent

active

041181085

ABSTRACT:
A zoom objective with a varifocal ratio close to 2:1, particularly for a projector, has a stationary positive front component, a single axially shiftable negative lens and a stationary multilens rear component. An object-side positive lens member of the rear component, adjoining the shiftable negative lens, has a focal length smaller than that of the group constituted by the remaining, image-side lens members of this component. The negatively refracting third member of the rear component may be a doublet with a positively refracting cemented surface, convex toward the image side, or an equivalent lens pair separated by a small air gap.

REFERENCES:
patent: 3532414 (1970-10-01), Higuchi et al.
patent: 3915547 (1975-10-01), Scidmore
patent: 3927931 (1975-12-01), Muszumanski

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