Masking device for overhead projector

Details Masking device for overhead projector Masking device for overhead projector

1991-05-24

1992-05-12

Cuchlinski, Jr., William A.

Optics: image projectors

Light shield, mask, hood, or diaphragm

353DIG5, 353 88, 353121, G03B 2154

Patent

active

051121239

ABSTRACT:
A device for selectively masking portions of transparent visual material to be projected by an overhead projector onto a screen including an opaque flexible sheet attached at one side to the overhead projector and at the other to a rod portion of a spool. When not in use the opaque flexible sheet is wound onto the spool. A portion, or all, of the transparent material may be blocked from projection by rolling the spool over the transparent material so that the opaque flexible sheet covers the undesired material.

REFERENCES:
patent: 3334540 (1967-08-01), Wright
patent: 3510214 (1970-05-01), Crow
patent: 3998535 (1976-12-01), Clarke
patent: 4632529 (1986-12-01), Levin
patent: 4688911 (1987-08-01), Simbal
patent: 4813780 (1989-03-01), Solyntjes
patent: 4942411 (1990-07-01), Polston
patent: 5013149 (1991-05-01), Downum et al.
patent: 5052798 (1991-10-01), Mardis

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