DEVICE FOR MEASURING TILT FOR OPTICAL PICKUP ACTUATOR

摘要

PURPOSE: A device for measuring tilt for an optical pickup actuator is provided to precisely recognize the tilted value of an object lens while continuously measuring by setting for once by measuring the displacements of two points on a driving object lens and calculating the tilted value of the object lens from the difference of the displacements to be digitalized. CONSTITUTION: Electricity is fed to an optical pickup actuator(10) for driving an object lens(12). A first displacement sensor(20) and a second displacement sensor(30) are controlled for projecting laser beams. The laser beams are irradiated to a first point(A) and to a second point(B) on the object lens for being inputted to the first displacement sensor and to the second displacement sensor. Herein, the first and the second displacement sensors output the displacement values of the first and the second points as a first voltage value(V1) and a second voltage value(V2). And, a differential amplifying unit(50) amplifies the difference(V1-V2) between the voltage values. The analog signal outputted from the differential amplifying unit is converted into a digital signal in a digital signal converting unit(60). An angle conversing unit(70) calculates the tilted value of the object lens by using the digital signal from the digital signal converting unit. And, the tilted value is displayed in a numeral form by a display unit(80).