Patent ID: 9000378
Filing Date: 2015-04-07
Classification: G01J,G02B,G08B

Abstract:
1. An optical detection device comprising: a multi-segment lens configured by combining a plurality of lenses having a same focal position; and an infrared light sensor having an infrared light receiver arranged on the focal position, wherein each of the plurality of lenses of the multi-segment lens is a Fresnel lens in which a second surface, being a reverse side surface of a first surface, has a plurality of lens surfaces, at least one of the plurality of lens surfaces is configured from a part of a side surface of an elliptical cone, and wherein any normal line intersecting with the lens surface configured from the part of the side surface of the elliptical cone among normal lines of respective points on the first surface is non-parallel to a central axis of the elliptical cone corresponding to the lens surface with which the any normal line intersects.