Variable focal length projection lens for use on overhead projec

Details Variable focal length projection lens for use on overhead projec Variable focal length projection lens for use on overhead projec

1981-04-16

1983-04-19

Corbin, John K.

350445, G02B 958, G02B 1514

Patent

active

043803741

ABSTRACT:
A variable focal length overhead projector lens having four elements positioned in a projection head with two elements on either side of a folding mirror and having a single movable negative lens element closest to the screen being movable to vary the focal length and magnification at a fixed object-to-image distance to fill the screen.

REFERENCES:
patent: 3357775 (1967-12-01), Appledorn et al.
patent: 3408135 (1968-10-01), Appledorn et al.
patent: 4311366 (1982-01-01), Clark et al.
patent: 4350415 (1982-09-01), Conrad

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