초록

A flow cytometer includes a temperature regulator that maintains the temperature of the piezoelectric actuator sufficiently constant so as to produce a consistent predetermined oscillation frequency, and corresponding consistent predetermined droplet break-off point.

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A flow cytometer includes a temperature regulator that maintains the temperature of the piezoelectric actuator sufficiently constant so as to produce a consistent predetermined oscillation frequency, and corresponding consistent predetermined droplet break-off point. of the first kind of order zero

A flow cytometer includes a temperature regulator that maintains the temperature of the piezoelectric actuator sufficiently constant so as to produce a consistent predetermined oscillation frequency, and corresponding consistent predetermined droplet break-off point. of the first kind of order zero and ρL,ρSrepresent two spatial frequencies, whereby intensities of the spatial frequencies ρLand ρSof an image signal sensed by said image sensing device are attenuated. 12. The apparatus according to claim 11, wherein the spatial frequencies ρLand ρSare approximately half of the spatial sampling frequency by said image sensing device. 13. The apparatus according to claim 11, wherein said optical rotating means has means, into which two periodic signals having different velocities are entered, for periodically moving said image sensing device in two different directions. 14. The apparatus according to claim 1, wherein said optical rotating means includes: an optical element placed between said image-forming means and said image sensing device for parallel-shifting the optic axis of said image-forming means; and means, into which two periodic signals having different velocities are entered, for periodically moving said optical element in two different directions. 15. The apparatus according to claim 13, wherein a slower velocity period of periodic motions in the two different directions is set to be four or more times a higher velocity period of said periodic motion. 16. The apparatus according to claim 14, wherein a slower velocity period of periodic motions in the two different directions is set to be four or more times a higher velocity period of said periodic motion. 17. The apparatus according to claim 13, wherein the two different directions are set so as to be mutually perpendicular. 18. The apparatus according to claim 14, wherein the two different directions are set so as to be mutually perpendicular. 19. An optical spatial filter device for controlling a spatial frequency characteristic of an optical image for luminance signal and an optical image for color signal delivered by an image forming optical system and formed on an image sensing device, said device comprising: luminous flux rotating means for rotating a luminous flux, which is delivered by the image forming optical system, on a sensing surface of said image sensing device along a closed path along a plane perpendicular to the optic axis of said image forming optical system while orientation of the luminous flux is substantially maintained vertically and horizontally; setting means for setting a size of a rotation al path of the optical image of the subject by said optical image rotating means, the size being determined according to a pitch of pixels of said image sensing device in the case of forming the image for luminance signal by the image forming optical system, and the size being determined according to an arranging period of a color filter of said image sensing device in the case of forming the image for color signal by the image forming optical system; and control means for controlling said luminous flux rotating means in such a manner that the luminous flux is made one or more revolutions of the size set by said setting means, during an exposure interval of said image sensing device. 20. The device according to claim 19, wherein a path of a rotation of the luminous flux is closed to form substantially circular or elliptical. 21. The device according to claim 19, wherein said luminous flux rotating means has a glass plate with parallel flat surfaces, which are rotated about the optic axis of said image forming optical system while inclined with respect to the optic axis. 22. The device according to claim 19, wherein said luminous flux rotating means has means for rotating said image sensing device while orientation of said image sensing device is substantially maintained vertically and horizontally. 23. The device according to claim 19, wherein said control means control said luminous flux rotating means in such a manner that the luminous flux is made an integral number of revolutions relative to the sensing surface during the exposur