Low profile episcopic projector and opaque materials therefor

Details Low profile episcopic projector and opaque materials therefor Low profile episcopic projector and opaque materials therefor

1974-09-19

1976-06-15

Rothberg, Samuel B.

Optics: image projectors

Picture carrier

156 4, 156 22, 350288, G03B 2100, G02B 508, C23F 100

Patent

active

039633381

ABSTRACT:
A large copy projector, in which the presence of elevated optics in front of the screen is avoided, uses opaque sheeting that is adapted to receive related graphic matter on its upper and lower faces. Simultaneously, the upper face is unobstructedly available for direct observation and manual access, and the lower face is unobtrusively available for image projection through a folded optical path below the opaque sheeting and a projection lens positioned elsewhere than directly over the copy. The copy is characterized by a lower specularly reflecting face that is accessible to the optical system from below but that can be marked from above by chemical etching from a user's pen or the like.

REFERENCES:
patent: 2776598 (1957-01-01), Dreyer

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