MANUFACTURE OF COLOR SELECTION ELECTRODE

PROBLEM TO BE SOLVED: To reduce the dispersion of resonance frequencies to avoid resonance with outside vibration and make production easy by pressing a frame part from the inside to the outside, and pressing the vicinity of the joining point of the frame part from the inside to the outside to deform the whole frame. SOLUTION: An elastic bottom supporting part 7 of a frame 3 is depressed from the inside to the outside, and the vicinity of the joining point of a metal thin plate holding frame part 6 is depressed from the outside to the inside. As the depressing point of the elastic bottom supporting frame part 7, a plurality of depressing points may be set in addition to the central point of the elastic bottom supporting frame part 7 for more uniform deformation. The metal thin plate holding frame part 6 is uniformly deformed, tension applied to an electrode is made almost uniform, and the dispersion of resonance frequency is reduced. Since the elastic bottom supporting frame part 7 is depressed from the inside, the interference of a fixing device for fixing the electrode with a pressing device for applying the depressing force is not produced, and the production is made relatively easy.