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Digital Light Control Arrangement

IP.com Disclosure Number: IPCOM000091840D
Original Publication Date: 1968-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Kosanke, K: AUTHOR [+2]

Abstract

This is an arrangement for selectively controlling the output of light through one of a plurality of points or subareas, disposed in a matrix-like array. It comprises a set of transparent masks partly consisting of or partly covered by photochromic material. The light of source 1 is collimated by lens 2, propagates through transparent masks 3...10 and is incident on screen 11. The crosshatched sections of these masks consist of photochromic material. The latter, when exposed to a radiation having the wavelength of the radiation of light sources 13...20, becomes opaque for the radiation of source 1. The radiation of the latter has a wavelength which does not influence the transmissivity of the photochromic material used.

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Digital Light Control Arrangement

This is an arrangement for selectively controlling the output of light through one of a plurality of points or subareas, disposed in a matrix-like array. It comprises a set of transparent masks partly consisting of or partly covered by photochromic material. The light of source 1 is collimated by lens 2, propagates through transparent masks 3...10 and is incident on screen 11. The crosshatched sections of these masks consist of photochromic material. The latter, when exposed to a radiation having the wavelength of the radiation of light sources 13...20, becomes opaque for the radiation of source 1. The radiation of the latter has a wavelength which does not influence the transmissivity of the photochromic material used. Light sources 13, 15, 17, and 19 can be connected directly to current source 12 by switches x1, x2, y1, and y2. Light sources 14, 16, 18, and 20 are connected to such switches via Inverters 24...30. By activating switches x1, x2, y1, and y2, individually or in any combination, the light output can be confined to any subarea or subareas of screen 11. The light output in subarea 11a, for example, is controlled by closing switches x1, x2, y1, and y2. For restoring the transparency of all areas covered by photochromic materials, a separate light source, not shown, having a radiation of adequate wavelength or a logic with such light sources, can be used.

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