Optical detection device, and apparatus using same
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsKana Oi, Takayuki Nishikawa
Life of this patent
Estimating the term…
Abstract
Each lens of a multi-segment lens is a Fresnel lens in which a second surface, being the 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 having a central axis oblique to a normal line of the first surface. 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.
Claims14
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.
Dependencies are inferred from the claim text.