LIGHT REFLECTING FILM AND LIGHT REFLECTOR

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PROBLEM TO BE SOLVED : To provide a light reflecting film (Ag-based alloy film) which hardly causes growth or aggregation of Ag crystal grains, can keep high reflectance and shows an index b* of 3 or less indicating the degree of yellowing, and to provide a light reflector using the light reflecting film. SOLUTION : The present invention includes : (1) a light reflecting film comprising an Ag-based alloy containing one or more kinds of rare earth elements by 0.05 to 0.75 atomic% in total and one or more kinds of Au, Pd and Pt by 0.5 to 2.0 atomic% in total; (2) a light reflecting film of (1) in which one or more kinds of rare earth elements is Nd and/or Y; or (3) a light reflecting film of (1) in which the Ag-based alloy contains one or more of Bi and Sn by 0.01 to 0.7 atomic% in total; and (4) a light reflector having one of the above light reflecting films. COPYRIGHT : (C)2007, JPO&INPIT