| 摘要 |
A LASER LIGHT BEAM IS ILLUMINATED VIA AN OBJECTIVE LENS ON THE SIGNAL SURFACE OF AN OPTICAL DISC (100, 110, 120) AN THE OBJECTIVE LENS IS DISPLACED BY A SERVO PROCESSOR ALONG THE OPTICAL AXIS FOR FOCUSSING SEARCH TO GENERATE FOCUSSING ERROR SIGNAL (FE) BY A RF BLOCK FROM A DETECTED OUTPUT OF THE LASER LIGHT BY THE SIGNAL SURFACE OF THE OPTICAL DISC. BASED ON THESE FOCUSSING ERROR SIGNALS (FE), A SYSTEM CONTROLLER DISCRIMINATES THE TYPES OF THE OPTICAL DISC HAVING DIFFERENT NUMBERS OF SIGNAL RECORDING LAYERS FOR SETTING AN OPERATING MODE IN KEEPING WITH THE TYPES OF THE OPTICAL DISC.
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