Infrared optical articles and a method for manufacturing the same, and infrared communication receiving unit

PROBLEM TO BE SOLVED: To provide an optical article for IR communication and a light receiving unit for IR communication, capable of specifically largely transmitting only a wavelength range in the IR communication band and visually showing white by scattering and reflecting light in a visible light region. SOLUTION: A scattering reflection layer 23 is formed by uniformly dispersing fine particles in a transparent binder resin, the fine particles having a refractive index different from that of the binder resin. The particle diameter D of a part of or the whole of the fine particles is controlled to be represented by D COPYRIGHT: (C)2010,JPO&INPIT