Low-Pressure Discharge Lamp Having Improved Efficiency

The invention relates to a low-pressure mercury vapor discharge lamp ( 10 ) comprising a light-transmitting discharge vessel ( 12 ) having a first layer ( 20 ) and a second layer ( 22 ), the first layer ( 20 ) facing the discharge space ( 14 ) and the second layer ( 22 ) being arranged between the f...

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Bibliographische Detailangaben
Hauptverfasser:	JUSTEL THOMAS, MERIKHI JACQUELINE
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES BASIC ELECTRIC ELEMENTS BLASTING CHEMISTRY DYES ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS ELECTRICITY ELECTROTHERAPY HEATING HUMAN NECESSITIES HYGIENE LIGHT SOURCES NOT OTHERWISE PROVIDED FOR LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATINGELEMENTS LIGHTING MAGNETOTHERAPY MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE MECHANICAL ENGINEERING MEDICAL OR VETERINARY SCIENCE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE PAINTS POLISHES RADIATION THERAPY ULTRASOUND THERAPY WEAPONS
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Beschreibung
Zusammenfassung:	The invention relates to a low-pressure mercury vapor discharge lamp ( 10 ) comprising a light-transmitting discharge vessel ( 12 ) having a first layer ( 20 ) and a second layer ( 22 ), the first layer ( 20 ) facing the discharge space ( 14 ) and the second layer ( 22 ) being arranged between the first layer ( 20 ) and an inner wall ( 18 ) of the discharge vessel ( 12 ). The first layer ( 20 ) comprising a first luminescent material for converting ultraviolet light ( 24 ) into output light ( 26 ). The second layer ( 22 ) comprising a second luminescent material for converting at least part of the ultraviolet light ( 26 ) transmitted through the first layer ( 20 ) into recycled ultraviolet light ( 28 ). The effect of the measures according to the invention is that at least part of the ultraviolet light ( 24 ) which is transmitted through the first layer ( 20 ) is converted by the second luminescent material of the second layer ( 22 ) into recycled ultraviolet light ( 28 ) which can subsequently be converted by the first luminescent material into output light ( 26 ), increasing the efficiency of the low-pressure mercury vapor discharge lamp ( 10 ). In a preferred embodiment of the low-pressure mercury vapor discharge lamp ( 40 ), the low-pressure mercury vapor discharge lamp ( 40 ) comprises a third layer ( 42 ) arranged between the discharge and the first layer ( 20 ) for converting ultraviolet light ( 24 ) into protective ultraviolet light ( 44 ) for protecting the first layer ( 20 ) from direct incidence of the ultraviolet light ( 24 ).