Material selective device

Details Material selective device Material selective device

1995-01-26

1995-11-21

Dowling, William C.

Optics: image projectors

Light shield, mask, hood, or diaphragm

353DIG5, G03B 2114

Patent

active

054692350

ABSTRACT:
A material selective device for projectors has a frame including a transparent top member and spaced opposed opaque side members that rests on the projector. A pair of opaque masking members slide in opposite sets of grooves in the inner faces of the side members to display only selected parts or all of material written on the top member or on a transparency supported by the device placed between the masking members or placed on the projector surface according to the selected positions of the masking members.

REFERENCES:
patent: 3269261 (1966-08-01), Porter
patent: 3510214 (1970-05-01), Crow
patent: 3531193 (1970-09-01), Diehl
patent: 3661449 (1972-05-01), Wright
patent: 3998535 (1976-12-01), Clarke
patent: 4688910 (1987-08-01), Deary
patent: 5121984 (1992-06-01), Jones et al.
patent: 5227820 (1993-07-01), Miyashita et al.

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