Variable focal length projection lens for use on overhead...

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

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88/99, 88/46.5

G02B 9/58 (2006.01) G02B 11/22 (2006.01) G02B 15/14 (2006.01) G03B 21/00 (2006.01) G03B 21/132 (2006.01)

Patent

CA 1178834

254,947 CAN/JCB Variable Focal Length Projection Lens For Use on Overhead Projectors 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 magnifi- cation at a fixed object-to-image distance to fill the screen.

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