| 摘要 |
PURPOSE:To obtain high color resolution by providing an automatic skew correcting circuit where the scanning direction of an electron beam is symmetrical to the right and left to a stripe filter and 90 deg. phase shift is attained to prevent generation of color mixture between R and B signals. CONSTITUTION:If a relative angle between an electron beam scanned by an electrostatic deflection electrode of an image pickup tube 3 and a color separation stripe filter is caused because of manufacture error, an error signal impossible for correlation is generated. This error signal is detected for vertical and horizontal directions by an H phase error detector 31 and a V phase error detector 32, and after the result is digitized by A/D converters 33, 34, the amount of correction is counted by a CPU35 and converted into an analog signal by D/A converters 36, 37. After the correction command signal is amplified by phase error amplifiers 39, 41, the result is applied to horizontal and vertical skew correcting circuits 52, 53 of electrostatic deflection circuits, the deflection angle of the electron beam is corrected so as to correct the color separation stripe filter 25 and the scanning beam in a way that they are shifted by just 90 deg.. |
