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A classifying device for classifying particles using a centrifugal force contains a microchannel includes a curved portion including a first tubular channel and a second tubular channel; and a diaphragm that is provided within the curved portion, and that is located at a position between the first t

A classifying device for classifying particles using a centrifugal force contains a microchannel includes a curved portion including a first tubular channel and a second tubular channel; and a diaphragm that is provided within the curved portion, and that is located at a position between the first tubular channel and the second tubular channel; and wherein the diaphragm has at least a first apertured group formed in a central region of the diaphragm and a second apertured group formed in a first end region and a second end region of the diaphragm, the first apertured group and the second apertured group communicate the first tubular channel with the second tubular channel along a direction of the centrifugal force, the first apertured group has a mesh, and the second apertured group has a mesh that is different in size from the mesh of the first apertured group.

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What is claimed is: 1. A classifying device for classifying particles using a centrifugal force, the classifying device comprising: a microchannel that includes a curved portion including a first tubular channel and a second tubular channel; and a diaphragm that is provided within the curved portio

What is claimed is: 1. A classifying device for classifying particles using a centrifugal force, the classifying device comprising: a microchannel that includes a curved portion including a first tubular channel and a second tubular channel; and a diaphragm that is provided within the curved portion, and that is located at a position between the first tubular channel and the second tubular channel; and wherein the diaphragm has at least a first apertured group formed in a central region of the diaphragm and a second apertured group formed in a first end region and a second end region of the diaphragm, the central region being sandwiched between the first end region and the second end region, the first apertured group and the second apertured group communicate the first tubular channel with the second tubular channel along a direction of the centrifugal force, the first apertured group has a mesh, and the second apertured group has a mesh that is different in size from the mesh of the first apertured group. 2. The classifying device according to claim 1, wherein the mesh of the first apertured group defines an upper limit of particles to be classified and the mesh of the second apertured group defines a lower limit of particles to be classified. 3. The classifying device according to claim 1, wherein the first end region and the second end region of the diaphragm incline toward the direction of the centrifugal force so as to have a predetermined gradient. 4. The classifying device according to claim 1, wherein the first tubular channel locates outward relative to the direction of the centrifugal force across an entire length of the curved portion, and the second tubular channel locates inward relative to the direction of the centrifugal force across the entire length of the curved portion. 5. The classifying device according to claim 1, wherein the mesh of the first apertured group is bigger than the mesh of the second apertured group. 6. The classifying device according to claim 1, wherein the mesh of the first apertured group is smaller than the mesh of the second apertured group. 7. The classifying device according to claim 1, wherein the second apertured group includes two sub apertured groups, one sub apertured group being formed in the first end region of the diaphragm and the other sub apertured group being formed in the second end region of the diaphragm, and each of the two sub apertured groups has a mesh, meshes of the two sub apertured groups being same size. 8. The classifying device according to claim 1, wherein the second apertured group includes two sub apertured groups, one sub apertured group being formed in the first end region of the diaphragm and the other sub apertured group being formed in the second end region of the diaphragm, and a distance from a longitudinal edge of the diaphragm being close to the first end region to one sub apertured group formed in the first end region is approximately same as a distance from a longitudinal edge of the diaphragm being close to the second end region to the other sub apertured group formed in the second end region. 9. The classifying device according to claim 3, wherein the gradient of the first end region and second end region of the diaphragm is more than about 0° but not over about 60°. 10. The classifying device according to claim 1, wherein a particles-dispersed liquid flows into a first tubular channel of a classifying device to classify particles using a centrifugal force. 11. The classifying device according to claim 10, wherein the particle dispersed liquid flows to achieve a dean number of about 8 or higher in the curved portion. 12. The classifying device according to claim 10, wherein the mesh of the first apertured group defines an upper limit of particles to be classified and the mesh of the second apertured group defines a lower limit of particles to be classified. 13. The classifying device according to claim 10, wherein the first end region and the second end region of the diaphragm incline toward the direction of the centrifugal force so as to have a predetermined gradient. 14. The classifying device according to claim 10, wherein the first tubular channel locates outward relative to the direction of the centrifugal force across an entire length of the curved portion, and the second tubular channel locates inward relative to the direction of the centrifugal force across the entire length of the curved portion. 15. The classifying device according to claim 10, wherein the mesh of the first apertured group is bigger than the mesh of the second apertured group. 16. The classifying device according to claim 10, wherein the mesh of the first apertured group is smaller than the mesh of the second apertured group. 17. The classifying device according to claim 10, wherein the second apertured group includes two sub apertured groups, one sub apertured group being formed in the first end region of the diaphragm and the other sub apertured group being formed in the second end region of the diaphragm, and each of the two sub apertured groups has a mesh, meshes of the two sub apertured groups being same size. 18. The classifying device according to claim 10, wherein the second apertured group includes two sub apertured groups, one sub apertured group being formed in the first end region of the diaphragm and the other sub apertured group being formed in the second end region of the diaphragm, and a distance from a longitudinal edge of the diaphragm being close to the first end region to one sub apertured group formed in the first end region is approximately same as a distance from a longitudinal edge of the diaphragm being close to the second end region to the other sub apertured group formed in the second end region. 19. The classifying device according to claim 13, wherein the gradient of the first end region and second end region of the diaphragm is more than about 0° but not over about 60°.