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Flow cytometer

  • US 6,713,019 B2
  • Filed: 03/27/2002
  • Issued: 03/30/2004
  • Est. Priority Date: 03/29/2001
  • Status: Active Grant
First Claim
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1. A flow cytometer, comprising:

  • a flow cell for flowing, therein, a sample liquid in a flowing direction to form a sample flow, the sample liquid containing particles to be analyzed;

    a laser diode radiating a laser beam having an elliptic cross section;

    a beam collimating section for collimating the laser beam radiated from the laser diode;

    a beam diffusing section for diffusing the collimated beam in a direction perpendicular to the flowing direction;

    a beam spot forming section for focusing the diffused beam at the sample flow in the flow cell to form a beam spot, the beam spot being an ellipse having a minor diameter in the flowing direction and a major diameter perpendicular to the flowing direction; and

    a light receiving section for receiving light generated from the particles at the beam spot to detect optical information of the particles, wherein the laser diode is arranged such that a minor diameter of the elliptic cross section of the laser beam is parallel to the flowing direction.

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