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 to deform the entire frame, placing a metal thin plate on the deformed frame and fixing to it, then releasing the pressing force to the frame part. SOLUTION: An elastic bottom supporting frame part 7 is pressed from the inside to the outside. As the pressing point, a plurality of pressing points may be set in addition to the central point of the elastic bottom supporting frame part 7 for more uniform deformation. By pressing the elastic bottom supporting frame part 7, a metal thin plate supporting frame part 6 is uniformly deformed, and when a metal thin plate is placed and fixed, the tension applied to the metal thin plate is made almost constant, and the dispersion of resonance frequencies is reduced. The tension in each part of an electrode after the pressing force is released is made uniform, and since the frame part is pressed from the inside, the interference of a fixing device of the electrode with a pressing device for applying the pressing force is not produced, and production is made easy.