| 摘要 |
PROBLEM TO BE SOLVED: To provide a dynamic focus circuit which lowers the cost and eliminates defocusing due to switching of a Cs capacity to always obtain satisfactory focusing by resolving the problem that a conventional dynamic focus circuit having an S-shaped distortion correction capacitor switching circuit in a horizontal deflecting circuit of a TV receiver or the like has a large number of parts and a high cost because being provided with a focus amplitude switching circuit, which keeps a focus output voltage constant, independently of the S-shaped distortion correction capacitor switching circuit and the problem that the focus voltage in the center or the periphery of a picture is deviated in some cases that the dynamic focus circuit is provided with only a Cs switching circuit and doesn't switch the output amplitude of the focus voltage. SOLUTION: A Cs switching circuit 2 which switches the capacitor capacity for S-shaped distortion correction is provided with a focus amplitude a switching function to reduce the number of parts, reduce the cost, and to eliminate defocusing due to switching of the Cs capacity, and thus satisfactory dynamic focusing is always obtained.
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