| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a halogen lamp with a reflection mirror capable of creating a well-established lighting space without breaking coordinated feeling as a whole when used for a partial illumination of products or the like even in a space totally illuminated by fluorescent lamps, sufficiently appealing the existence of the products, with advantageous production cost. <P>SOLUTION: An interference filter with three-layer structure composed of a first and a third layers of high refractive index and a second layer of low refractive index is arranged on a main surface at the outside or inside of the front glass fitted to an opening part of the halogen lamp with the reflection mirror. An optical film thickness of the first layer to the third layer is almost the same with each other, and the value ranges within 150 and 170 nm. On condition that X is the optical film thickness and Y is a relative ratio of the refractive index of the layer of high refractive index to that of low refractive index, a point (X, Y) is almost to be included inside an area surrounded by the lines connecting four points (150, 1.452), (150, 1.404), (170, 1.351), (170, 1.418) successively. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
