Patent ID: 7561267

Claim:
A flow cytometer, comprising: a light source; a light beam shaping module for collimating and converging a light beam emitted from the light source so that the light beam thereby irradiates samples to be detected, wherein the light beam shaping module comprises an aspherical lens for collimating the light beam; a sample generation unit, which comprises a gas-liquid transfer controlling module and a flow chamber that are interconnected so that a sample liquid containing cells to be detected flows through the flow chamber while being carried by sheath fluid; and a signal processing unit, for collecting, photoelectrically converting, analyzing a scattered beam emitted from the flow chamber and outputting analysis results thereof, wherein a converged focus of the first cylindrical lens lies in an area where the sample flow passes through, while a converged focus of the second cylindrical lens is deviated from the area where the sample flow passes through, the light beam shaping module comprises a first cylindrical lens and a second cylindrical lens for respectively converging the light beams in two directions, a convergent light beam through the first and second cylindrical lenses have a cross section of an elliptical pattern in the cell-detection zone of the flow chamber, wherein a minor axis of the elliptical pattern being 15 μm-25 μm long, a major axis being 160 μm-220 μm long, and a direction of the minor axis being coincident with the flowing direction of the sample flow within the flow chamber, while a direction of the major axis perpendicular to the plane which is defined by the flowing direction of the sample flow and the transmitting direction of the light beam, and an irradiation depth of the light beams is 8 μm-12 μm, and a light intensity is uniformly distributed at a segment in the direction of the major axis.