| 摘要 |
a beam moving means (14) for moving a predetermined beam into a vertical or horizontal direction; a video pick-up means (5) for picking up a beam pattern displayed on a screen; a focus control means (3) for controlling a focus of a video selected into the video pick-up means (5); a position indicating means (4) for moving the pick-up means to an indicated position; a microcomputer (6); a control means (13) for controlling a driving means (15) which drives the color cathode-ray tube into an indicated pattern and condition, and a beam moving means for depleting the beam by receiving a microcomputer signal; a display means (12) for outputting a measuring result calculated by the microcomputer (6); an A/D converting section (7) for converting input data into digital data by the micrpcomputer (6); a video memory section (11) for respectively memorizing data by separating the digital data to RGB ; a computing section (9) for getting a center of the beam from a search beam size and calculating amount of the mis-convergence from a center position of respective RGB ; and CPU (8).
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