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4. CIRCUIT DESCRIPTIONS

4 . 1 ACCURATE FOCUS SERVO SYSTEM

As a method (the Accurate Focus System) for re-

ducing the distortion of RF signals read by the

pickup, delays have been applied to the output of 2

photodiodes that precede the quarter photodiodes

and is followed by an addition operation in order to

achieve improvements in frequency responce, dis-

tortion, S/N, and so on as well as to increase the

accuracy of signal reading.

Fig. 4-1

1 3