Patent Number: 
Section: claims

1. An electrostatic deflector,wherein the electrostatic deflector includes a plurality of electrode members arranged to put slits, extending along a bus bar, therebetween and to be formed into an essentially conical shape, andthe electrode members are installed on an insulator through a flange portion formed on a large-diameter side of the electrode members; andwherein the electrode members are manufactured by forming a plurality of slits in an essentially conical electrode material to extend in the same direction as that of a bus bar of the electrode material, coupling the flange section with the insulator, and then cutting the electrode material along extension lines of the slits for electrical isolation. 2. The electrostatic deflector according to claim 1, wherein the slits in the electrode material are continuously formed spanning from the flange section to a conical section. 3. The electrostatic deflector according to claim 1, wherein the electrode material is an essentially conical, tubular member with required thickness. 4. The electrostatic deflector according to claim 2, wherein the cutting of the conical electrode material is started from a small-diameter section thereof. 5. The electrostatic deflector according to claim 2, wherein the electrode material is an essentially conical, tubular member with required thickness. 6. The electrostatic deflector according to claim 4, wherein the cutting is executed by electrical discharge machining. 7. The electrostatic deflector according to claim 4, wherein the electrode material is an essentially conical, tubular member with required thickness. 8. The electrostatic deflector according to claim 6, wherein the electrode material is an essentially conical, tubular member with required thickness.