Overhead projector

Details Overhead projector Overhead projector

1994-03-07

1996-06-25

Dowling, William C.

Optics: image projectors

Epidiascope

353 69, 353DIG3, 353DIG4, G03B 2100

Patent

active

055304966

ABSTRACT:
An overhead projector for projecting an image of a sheet material placed on a flat stage onto a remote screen standing almost vertically has a projection optical system with its optical axis aligned with a normal line of the stage. The projection optical system is shifted keeping the optical axis in parallel with the normal line so as to project an image at an angle of elevation onto the screen.

REFERENCES:
patent: 3547530 (1970-12-01), Poole
patent: 4002408 (1977-01-01), Amma
patent: 4406530 (1983-09-01), Hasegawa et al.
patent: 4846570 (1989-07-01), Kanai
patent: 4974958 (1990-12-01), Yoshida

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