PARTICLE ANALYSIS DEVICE, OPTICAL SYSTEM FOR PARTICLE ANALYSIS DEVICE, AND LENS FOR PARTICLE ANALYSIS DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a particle analysis device, an optical system for the particle analysis device, and a lens for the particle analysis device capable of reducing forward scatter light removed by a beam stopper.SOLUTION: A blood cell analysis device 1 includes: a flow cell D1, a light irradiation optical system D3, and a forward scatter light receiving optical system D4 as an optical detector. The forward scatter light receiving optical system D4 includes: a forward capacitor lens 201 for collecting the forward scatter light from the flow cell D1, a photo diode 203 for receiving the collected forward scatter light; and a beam stopper S for removing a direct light having transmitted the flow cell D1. The forward capacitor lens 201 includes an aspherical surface, and is configured to have a focal length of the center part longer than the focal length of a peripheral part.