| 摘要 |
PURPOSE:To obtain a device which inputs and output information smoothly, in interlocking a tracking actuator with an optical head actuator, by using a pulse motor which is manufactured at low cost. CONSTITUTION:In a figure, 1 is a rotary recording medium (disk) and 20 is an optical head. In this optical head 20, a condenser lens 2 supported by a spring, rubber 4, etc., is coupled with a VCM3 and moved in a radius direction by a driving circuit to perform tracking control. A current detection resistance 7 detects a driving current and a low-pass filter 8 cuts unnecessary components to obtain an output proportional to the mean flection extent of the spring. This output is passed through the circuit consisting of comparator circuit 9 and 10 and reference voltage setting circuits 11 and 11' to constitute the circuit which detect the mean flection extent of the supporting spring 4 is too close to an inner side or outer side. Gate circuits 21 and 22 are opened by its output and the output of an oscillating circuit 14 is sent to a stepping motor driving circuit 13 to move an optical head 20 in such a direction that the flection extent of the spring is canceled. |
