LIQUID CRYSTAL DRIVING DEVICE, LASER HEAD AND COMPACT DISK DEVICE OF THE SAME

摘要

PURPOSE: A liquid crystal driving device, laser head and compact disk device of the same are provided to compensate for a spherical aberration by compensating for several axes of tilt independently. CONSTITUTION: A periodic wave generator(1) generates a periodic wave. A phase shift unit(3) inputs the output of the periodic wave generator(1) and shifts a phase on the ground of a command value. An inversion element(7) inverts the output of the phase shift unit(3). A voltage dividing resistor(9) connects a plurality of resistance in series, and accesses the output of the phase shift unit(3) and the output of the inversion element(7). A liquid crystal element(11) has an electrode unit and a common electrode(12) opposite to the electrode unit, connects the common electrode(12) with the output of the periodic wave generator(1), and connects the electrode unit with the output of the voltage dividing resistor(9).