| 摘要 |
PURPOSE:To obtain a circuit which can accurately match the convergence of each part even with difference of the convergence correcting value due to unequal winding of a deflection coil, by splitting a screen into a plurality and performing the convergence at each split part independently. CONSTITUTION:To an input terminal 1, a signal superimposing a parabola wave of vertical period on a horizontal period parabola wave is applied and to an input terminal 2(3), a signal superimposing a vertical period parabola wave on a horizontal period lower right (upper right) saw tooth wave is applied. Vertical and horizontal synchronizing signals are applied to input terminals 4 and 5 respectively and a signal inverted at the center of the vertical and horizontal scanning periods is formed with monostable multivibrators 30 and 31. Thus, a switch 24 turns on at the upper left quadrant of the screen, a signal from the terminals 1 and 2 is adjusted with variable resistors 11 and 19 for convergence. Similarly, switches 25, 26 and 27 are sequentially closed and the convergence is made in the order of upper right, lower left and lower right. |
