| 摘要 |
PROBLEM TO BE SOLVED: To restrain abnormal discharge at a terminal part and fall out of a covering layer and to improve image quality by composing plural terminal having specific ratio permeability with non-magnetic alloy layers connected to respective plural electrode parts connected to a resistor layer on one main surface of an insulation board, and oxidized layers obtained at an oxidation process to their surfaces, and by forming an insulating cover layer at a predetermined position on each of the oxidized layers. SOLUTION: Terminals 31A-31E connected to electrode layers 22A-22E connected with one another through a resistor layer 23 on one main surface 21a of an insulation board 21 by crimping and fixing a cylindrical part 31a inserted into a through hole 25 penetrating the insulation board 21 have specific permeability of 1.005 or less. Therefore, image quality is good because no distortion occurs in a magnetic field generated by a deflection yoke. Preferably, the terminals 31A-31E each comprise a non-magnetic alloy layer of Ni-Cr and an oxidized film halving specific permeability lower than that thereof, formed on its surface by its heat treatment and containing Cr2O3 and NiCr2O4 as main constituents, and firmly adhere to an insulting cover layer 24 on them so that they are never exposed by a crack during thermal expansion.
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