Minnesota Mining and Manufacturing Company

Philip V Palmquist

Thomas I Bradshaw

Sheeting useful as a projection screen, especially for projection television, comprises a transparent film that is configured on its back surface with a random pattern of generally parallel elongated microscopic recesses or projections, is reflectively coated on that surface, and is configured on its front surface with lenticular light-refracting recesses or projections that spread light entering and leaving that surface. The screen is generally oriented during use so that the elongated recesses or projections in the back surface are arranged vertically. Light projected at the screen enters and is refracted at the front surface, is reflected by the back surface, and is refracted again at the front surface to provide bright images visible with good uniformity to a widely distributed audience.

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Maplewood, MN, United States of America

Philip V Palmquist