| 摘要 |
PURPOSE: A dynamic focus circuit is provided to be capable of generating corrected waveforms of optimum bath tub shape required to a brown tube having a screen ratio of 16:9 or a flat brawn tube. CONSTITUTION: Triangular waves synchronized by horizontal and vertical synchronous signals are input through first and second input terminals. First and second multipliers(1,2) generate first and second parabola waves from the input triangular waves. A non-linear amplifier(7) non-linearly amplifies the amplitude of output voltage of the first multiplier(1). First and second amplifiers(3,4) amplify the output of the non-linear amplifier(7) and the output of the second multiplier(2). An adder(5) adds the outputs of the first and second amplifiers(3,4). A high voltage amplifier(6) amplifies the output of the adder(5) to high voltage of amplitude required to a focus electrode of a brawn tube.
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