| 摘要 |
PURPOSE:To stabilize both tracking control and jumping scanning, by storing the signal of a tracking control system, then using this signal to drive a tracking element and a linear motor. CONSTITUTION:A tracking element 12, a photodetector 11, a mobile part 13 of a speed detector, etc. are attached to a shift base 14 and moved toward the radius of a recording disk 1. When a switch 28 is short circuited, both tracking and shift controllers are actuated. Then a storage command circuit 34 transmits a storage command signal to AND circuits 36, 37 and 38 respectively. A storage circuit 44 delivers the signal storing from the 1st address through the N1-th address in response to the counting output of a counter circuit 42 and synchronously with the revolution of a motor 2. The output of the circuit 44 undergoes a D/A conversion. A synthesizing circuit 29 synthesizes its signal with the signal of the switch 28 to transmits them to a driving circuit 30 and a driving control circuit 32. |
