Browse Prior Art Database

HIGH-BRIGHTNESS FRONT SURFACE PROJECTION SCREEN

IP.com Disclosure Number: IPCOM000022795D
Original Publication Date: 1976-Feb-29
Included in the Prior Art Database: 2004-Mar-26
Document File: 2 page(s) / 188K

Publishing Venue

Xerox Disclosure Journal

Abstract

A diffuse-reflecting front surface projection screen, parti- cularly suitable for viewing projected micro-imaged trans- parencies in ambient room illumination, is produced by applying bright aluminum powder in small-flake form to a concave surface treated with an adhesive. The angle of dif- fusion is limited by orienting the flakes substantially parallel to the surface, and by restricting the curvature of the substrate to give an included viewing angle of about 40° or less. The concave substrate is preferably spherical in section. The average thickness of the aluminum layer is preferably about one monolayer. The flakes may be applied

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XEROX DISCLOSURE JOURNAL

HIGH-BRIGHTNESS FRONT-SURFACE Proposed Classification
PROJECTION SCREEN U.S. CL 350/116
0. A. Ulirich mt. CL G02b 27/02

A diffuse-reflecting front surface projection screen, parti-
cularly suitable for viewing projected micro-imaged trans-
parencies in ambient room illumination, is produced by
applying bright aluminum powder in small-flake form to a
concave surface treated with an adhesive. The angle of dif-
fusion is limited by orienting the flakes substantially
parallel to the surface, and by restricting the curvature of
the substrate to give an included viewing angle of about 40°
or less. The concave substrate is preferably spherical in
section. The average thickness of the aluminum layer is
preferably about one monolayer. The flakes may be applied

by any suitable method, as by dusting and spreading with a
cotton pad. The screen may, optionally, be protected with
a transparent film, such as a vinyl compound in solution.

Volume 1 Number 2 February 1976 89

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90 XEROX DISCLOSURE JOURNAL
volume 1 Number 2 February 1976

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