ULTRAVIOLET LAMP FOR STERILIZATION

• Main Authors: ODA YUJI, SATO KAZUAKI, ORITO HIDEMI, YONEYAMA NAOTO
• Format: Patent
• Language: English
• Published: 03.02.2011
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS; ELECTRICITY

PROBLEM TO BE SOLVED: To provide an ultraviolet lamp for sterilization capable of suppressing an ozone generation amount without weakening ultraviolet intensity of a wavelength of 254 nm and maintaining high ultraviolet intensity even if it is used for a long time. SOLUTION: The ultraviolet lamp is composed of a high pressure mercury lamp made of a straight quartz glass bulb which transmits an ultraviolet beam of a wavelength of 254 nm and is equipped with electrodes on each of inner both ends in which a rare gas and mercury are enclosed, and is provided with a two-layer-structured coated film composed of a zirconium oxide film formed on an outer surface of the bulb as a first layer and a silicon oxide film formed as a second layer. The light transmission ratio of the bulb provided with the coated film is 2% or less in a wavelength region of 200 nm or less and 75% or more and 95% or less in a wavelength of 254 nm and 50% in a wavelength region of 220-235 nm. COPYRIGHT: (C)2011,JPO&INPIT