Automatic focus for overhead projector

Details Automatic focus for overhead projector Automatic focus for overhead projector

G - Physics

03

B

88/46.5

G03B 21/132 (2006.01)

Patent

CA 1263260

Abstract Automatic Focus For Overhead Projector An overhead projector (10) includes a projection head (16, 46) which contains a pivoting mirror (22, 48) and a pivoting projection lens (20, 52) interconnected by a linkage (40, 62). Rotation of the mirror (22, 48) causes rotation and translation of the projection lens (20, 52) and automatically corrects for Scheimpflug distortion and loss of overall focus of the projected image.

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