BULB TYPE HEATER AND MANUFACTURING METHOD OF BULB TYPE HEATER

摘要

PROBLEM TO BE SOLVED: To easily control luminescent color without changing a manufacturing condition or a film material by forming, on a radiation-transmitting bulb with a surface frosted, a film by unevenly changing the film thickness to adjust the film thickness thereof. SOLUTION: The depth of the frost 19 formed by applying a frost treatment to a surface of a bulb 12 made of quartz glass is set to around 4μm or over. A low-reflectivity film 21 containing SiO2as a main constituent is formed as a first layer on the frost 19 by applying it by a dipping method and thereafter baking it; and a high-reflectivity film 22 containing Fe2O3as a main constituent is formed as the second layer by applying it by a dipping method and thereafter baking it. A plurality of the low-reflectivity films 21 and the high-reflectivity films 22 are alternately formed as the third layer and on. COPYRIGHT: (C)2006,JPO&NCIPI