| 摘要 |
PROBLEM TO BE SOLVED: To prevent distortion even when a deflecting coil is used in a scanning coil by installing a variable means which varies scanning time per pixel according to a distortion correcting amount, measuring a specified pattern dimension on a screen, and converting the measuring error of the pattern into a time correcting amount per pixel. SOLUTION: A one step time adjusting part 31 receives an output from a scanning signal forming part 32, and conducts step time correction per pixel. The output of the adjusting part 31 is inputted in a scanning signal driving circuit 10, a detecting signal from a detector 5 is sent to a length value measuring part 20 through an amplifier 6, an A/D converter 7, and an image processing device 8 to measure previously decided block length, and based on the measured signal, a correcting amount calculating part 21 finds a time correcting amount per step. In a scanning signal generator 30, the adjusting part 31 adds a time correcting value from the correcting amount calculating part 21 to a constant periodic step sent from the scanning signal forming part 32, and the scanning signal driving circuit 10 is driven. Thereby, an image signal with no distortion can be obtained.
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