| 摘要 |
PROBLEM TO BE SOLVED: To improve a gain in a low frequency area and to stabilize operation by comprising a driving circuit of a head of an optical disk device by using a tracking error signal whose gain in the low frequency area is increased. SOLUTION: The grain improving circuit in a low frequency area of this device is composed of two stages of a first gain improving circuit 160 and a second gain improving circuit 170. The first gain improving circuit 160 is a low pass filter composed of resistors 162, 164 and a capacitor 166. The second gain improving circuit 170 is a low pass filter composed of resistors 172, 174 and a capacitor 176. When a biaxial actuator is used, the gain in a low frequency area is low, thus, the responsiveness of tracking servo control is low and the operation becomes unstable. The gain in the low frequency area is made high, the responsiveness is improved and the operation is stabilized by using the first gain improving circuit 160 and the second gain improving circuit 170. |
