Patent ID: 6346701
Filing Date: 2002-02-12
Classification: G01J,H01L

Abstract:
A method of photodetection utilizing a condenser lens positioned in front of a photodetection element, comprising the steps of:utilizing, as said condenser lens, a non-spherical lens that concentrates, at a single point without spherical aberration, light that is input from the optic axis direction of this lens; and positioning said photodetection element such that the photodetection surface of said photodetection element is disposed closer to the lens than the point of convergence of said condenser lens, such that light that has passed through said condenser lens is photodetected over a majority of the photodetection surface of said photodetection element and that said photodetection element is positioned in a position where the photodetection element can photodetect all of light that is incident inclined at a prescribed angle with respect to the optic axis of said condenser lens.