OPTICAL BODY AND WINDOW MATERIAL PROVIDED WITH THE OPTICAL BODY

摘要

An optical body is provided with an optical layer having an incident surface from which light enters and a wavelength selective reflection film formed in the optical layer. The optical body directionally reflects the light of a specific wavelength band in a selective manner, while transmitting light other than that of the specific wavelength band. The optical body directionally reflects the light of the specific wavelength band out of light incident on the incident surface at angles of incidence (?, f) (provided that ?: angle between a perpendicular line to the incident surface and incident light incident on the incident surface or the reflected light emitted from the incident surface, and f: angle between a specific straight line within the incident surface and a component which is obtained by projecting the incident light or the reflected light on the incident surface) in a direction other than positive reflection (-?, f + 180°) in a selective manner, while transmitting the light other than that of the specific wavelength band and having the transparency to the light other than that of the specific wavelength band.