| 摘要 |
PURPOSE:To obtain the subject material which shows an excellent concentration efficiency irrespectively of the incident angle of the light from the source by composing it of a plurality of specified materials under specified conditions. CONSTITUTION:This material is composed of a transparent material A (e.g. polymethyl methacrylate) satisfying the formula (wherein ndA and ndB are the refractive indices of materials A and B, respectively, for d-line) and a transparent material B (e.g. fine spherical alumina particles) and is prepared by dispersing material B in material B. Desirably, material B is spherical particles of a particle diameter of 0.01-50mum and is used in an amount of 0.1-30vol.%. |
