| 摘要 |
PURPOSE:To adjust the position when deflecting is deviated and to execute high- quality picture recording by detecting that an electron beam is deflected in parallel with a fluorescent body by an optical sensor prior to deflecting scanning of a color FOT (fiber optical tube). CONSTITUTION:Picture information which is analyzed to three primary colors is stored in a buffer memory 32 through a multiplexer 30 by A/D conversion 31, and the picture information is read by the control signal from a timing generation circuit 33. Position information in accordance with the vertical and horizontal directions of a fluorescent body which is stored in look-up tables 40 and 41 is read, the picture information and the position information are processed by multiplexers 35 and 36, and D/A converters 42-44, and they are added to a color CRT21. Mask plates 12 and 13 which intercept light is arranged at the center part of both ends except the range of a recording effective range ER of fluorescent bodies 5R-5B for the deflecting face in the vertical and horizontal directions of the CRT21. An optical sensor is arranged at round and small holes 12A and 13A of the center part. The sensor detects whether or not deflection is deviated, and when it is deviated, the position is adjusted.
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