The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 25, 2002
Filed:
Jul. 31, 2000
Masao Yamazaki, Tokyo, JP;
Yutaka Nagai, Tokyo, JP;
Katsuhiro Tsuchiya, Tokyo, JP;
Yoshiyuki Takahara, Tokyo, JP;
Nihon Kohden Corporation, Tokyo, JP;
Abstract
A flow cell , a composite lens , and first to third detectors to are arranged in this sequence in the light pathway of light emitted from a laser light source . The composite lens is configured by a convex lens , and lens elements and . These lenses have different focal lengths. When the posture of the composite lens is correct, light impinging on the convex lens forms an image on the first detector. Therefore, the positioning of the composite lens is enabled. When particles in the flow cell are irradiated with laser light, forward scatter is produced. Forward small angle scatter having a small scattering angle impinges on the first lens element to be collected thereby, and is then received by the second detector . Forward large angle scatter having a large scattering angle impinges on the second lens element in the outermost periphery to be collected thereby, and is then received by the third detector which is remotest from the composite lens.