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Visible Solid State Light Indicator

IP.com Disclosure Number: IPCOM000095888D
Original Publication Date: 1964-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Triebwasser, S: AUTHOR

Abstract

Use is made of a solid state light source as a visible circuit condition indicator such as, e. g. , a panel board lamp type device. The most efficient solid state light sources emit in the infrared or similar portions of the spectrum. These devices are coated with an infrared quenchable phosphor which emits visible radiation in the presence of ultraviolet light and is quenched by the presence of both ultraviolet and infrared radiation. Note an article entitled "Quenching, Stimulation, and Exhaustion Studies on Some Infrared Stimulable Phosphors" by S. P. Keller and G. D. Pettit, The Physical Review, Vol. III, No. 6, 1533-1539, September 15, 1958. Thus, an indicator panel having a number of solid state panel lamps is under constant illumination by a single ultraviolet lamp.

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Visible Solid State Light Indicator

Use is made of a solid state light source as a visible circuit condition indicator such as, e. g. , a panel board lamp type device. The most efficient solid state light sources emit in the infrared or similar portions of the spectrum. These devices are coated with an infrared quenchable phosphor which emits visible radiation in the presence of ultraviolet light and is quenched by the presence of both ultraviolet and infrared radiation. Note an article entitled "Quenching, Stimulation, and Exhaustion Studies on Some Infrared Stimulable Phosphors" by S. P. Keller and G. D. Pettit, The Physical Review, Vol. III, No. 6, 1533-1539, September 15, 1958. Thus, an indicator panel having a number of solid state panel lamps is under constant illumination by a single ultraviolet lamp. The state of the circuits under control is indicated by the absence or presence of visible radiation emitted by the phosphorus.

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