Patent ID: 7745793
Filing Date: 2010-06-29
Classification: H04B

Abstract:
1. An infrared signal receiver comprising: a photo-detector unit receiving light of a predetermined infrared wavelength region, sent from a remote operating unit; and an optical element disposed in front of the photo-detector unit, allowing the light of the predetermined infrared wavelength region to transmit therethrough in preference to other infrared wavelength region, wherein: the predetermined signal wavelength region is a region of 930 nm or longer and 960 nm or shorter, mean transmittance of light of the optical element in the predetermined signal wavelength region at an angle of incidence of 0° is larger than mean transmittance of light in a region of 900 nm or longer and 930 nm or shorter, and/or, mean transmittance of light in a region of 960 nm or longer and 1,020 nm or shorter, and the predetermined infrared wavelength region sent from the remote operating unit and a peak position of the transmittance of the optical element match each other.