Patent ID: 6084670
Filing Date: 2000-07-04
Classification: G01N,Y10S

Abstract:
A particle analyzer in which particles are sorted by separately detecting regions of scatter which are produced by irradiating the particles with light, the regions having different scattering angles, comprising:a composite lens placed so as to block a light pathway of the scatter, fabricated by integrally joining plural ring-like lens elements of different focal positions together in a state in which said lens elements are concentrically positioned;plural detectors for detecting different scattering angles, said detectors respectively placed at imaging positions of the scatter, said imaging positions respectively corresponding to the focal positions of said plural lens elements;analyzing means for analyzing the particles on the basis of detection outputs of said plural detectors;a positioning element disposed in a center area of said composite lens; anda positioning detector for detecting light which has passed through said positioning element,wherein when at least a center of said composite lens coincides with an optical axis of said positioning element and said composite lens is perpendicular to the optical axis, said positioning element allows a predetermined amount of light from a light source disposed in front of said positioning element, to be received by said positioning detector.