FLUORESCENT LAMP AND LIGHTING FIXTURE

• Main Authors: TOKUNAGA MASUNORI, KOBAYASHI TAKEHISA
• Format: Patent
• Language: English
• Published: 15.09.2005
• Edition: 7
• Subjects: BASIC ELECTRIC ELEMENTS; BLASTING; ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS; ELECTRICITY; HEATING; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21Sand F21V, RELATING TO THEFORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THELIGHT EMITTED; LIGHTING; MECHANICAL ENGINEERING; NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

PROBLEM TO BE SOLVED: To provide a circular fluorescent lamp, and a lighting fixture, endowed with an ability of restraining the transmission of light with a wavelength of 400 nm or less. SOLUTION: The circular fluorescent lamp 1 is provided with a circular discharge tube (a glass tube) 4, an ultraviolet inhibiting layer 2 fitted on an inside face of the circular discharge tube, and a phosphor layer 3 fitted on the ultraviolet inhibiting layer. The ultraviolet inhibiting layer 2 has a function of inhibiting the transmission of light with a wavelength of 400 nm or less. The ultraviolet inhibiting layer 2 can contain at least one out of titanium oxide, antimony trioxide, zinc oxide, and iron oxide. A film thickness of the ultraviolet inhibiting layer 2 is to be 0.15 to 1.25 μm. COPYRIGHT: (C)2005,JPO&NCIPI