Automatic focus for overhead projector

Details Automatic focus for overhead projector Automatic focus for overhead projector

1985-04-01

1987-01-06

Haroian, Harry N.

Optics: image projectors

Reflector

353DIG6, G03B 2130

Patent

active

046342460

ABSTRACT:
An overhead projector includes a projection head which contains a pivoting mirror and a pivoting projection lens interconnected by a linkage. Rotation of the mirror causes rotation and translation of the projection lens and automatically corrects for Scheimpflug distortion and loss of overall focus of the projected image.

REFERENCES:
patent: 3472589 (1969-10-01), Field
patent: 3486817 (1969-12-01), Hubner

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