| 摘要 |
PROBLEM TO BE SOLVED: To suppress fluctuation in luminance caused by mainly changes in cutoff characteristics. SOLUTION: The amount of fluctuation in a cathode current 13 is fed back to a cathode voltage to suppress the fluctuation of a cathode voltage Ek. At that time, resistive values of a bias resistor 17 and divided resistors 15 and 16 are optimized considering the regulation characteristics of a fly back transformer 7 so as to suppress the luminance fluctuation of a cathode ray tube 8.
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