| 摘要 |
<p>PURPOSE:To uniformize each temperature of plural pieces of heating elements by abating the heating value or heating efficiency of a heating element at the center lower than two heating elements at both sides. CONSTITUTION:Ribbon width of a heating element 5B at the center among three heating elements 5A-5C formed on a heat resistant insulating substrate 1 is being formed to be wider than each ribbon width of two heating elements 5A, 5C at both sides. In brief, an electric resistance value of the heating element 5B becomes smaller than that of these heating elements 5A, 5C. Consequently, heating value of the heating element 5B becomes smaller than that of the heating elements 5A, 5C. As leaving this state intact, temperature in the heating element 5A comes to be more lowered than that of the heating elements 5A, 5C, but it goes up by receiving heat radiation and heat conduction from both sides, and each temperature of the heating element 5B and the heating elements 5A, 5C comes to be almost equal. With this constitution, any variation in a color tone during operation of an in-line color picture tube is restrainable.</p> |
