For infrared communication optical articles and a method of manufacturing the same, and infrared communication for receiving part

摘要

PPROBLEM 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. PSOLUTION: 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 D0.4×λ÷π, wherein D represents the particle diameter and λ represents a wavelength in the IR communication band, to allow the fine particles to scatter and reflect light in the visible light region to develop a white color; and the transmittance of the layer in the wavelength region of the IR communication band is set to not less than 12%. The scattering reflection layer 23 is formed on the outer surface of a substrate 21 to fabricate the light receiving unit 15 for IR communication. PCOPYRIGHT: (C)2010,JPO&INPIT