Projection markerboard

Details Projection markerboard Projection markerboard

1992-06-17

1994-11-01

Wintercorn, Richard A.

Optical: systems and elements

Projection screen

Unitary sheet comprising plural refracting areas

G03B 2156

Patent

active

053611640

ABSTRACT:
A high quality projection screen which also is a dry erasable markerboard is disclosed, together with a method for making such a combination projection screen and dry erasable markerboard. The light reflecting writing surface of the combination projection screen and dry erasable markerboard preferably is white, off-white or light in color, and has a bi-directional lenticular embossed surface for increased and more accurate reflection of projected light, and a wider angle effective viewing area. The light reflecting writing surface preferably is made of a thin film of fluoropolymer, such as a modified copolymer of ethylene and tetrafluoroethylene.

REFERENCES:
patent: 3549463 (1970-12-01), Frech
patent: 5200853 (1993-04-01), Berkman

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