Tilt offset correction method for actuator

Abstract

The invention relates to a tilt offset correction method for an actuator. According to the method, a projection beam is focused at a data layer; a plurality of control voltages are output, an object lens is obliquely moved by an analog driving circuit, and the corresponding displacement signal is recorded; an offset curve is approximated; the zero control voltage is output, the object lens is obliquely moved without the presence of the analog driving circuit, and a reference displacement signal is measured; an offset correction voltage is obtained from the offset curve by using the reference displacement signal; and the tilt offset of the actuator is corrected by compensating the control voltage.

Description

technical field [0001] The invention relates to an optical drive, in particular to a method for correcting the offset generated by the actuator of the pickup head in the optical drive to tilt the objective lens. Background technique [0002] With the popular trend of thinner and smaller consumer electronic products, the optical drive's read head is lightweight, which amplifies the offset of the actuator driving signal, resulting in an increase in the offset of the moving objective lens tilt, which in turn affects the read and write precision of the optical drive. [0003] like figure 1 Shown is a functional block diagram of prior art actuator tilt offset correction. The prior art optical drive 10 uses a microprocessor 11 to control a spindle motor 12 to rotate an optical disc 13 . And control the digital signal processing device (Digital Signal Processor, referred to as DSP) 14, convert the digital control signal into an analog control voltage, and then drive the actuator ...

AI Technical Summary

Problems solved by technology

[0004] However, the control voltage output level of the digital signal processing device 14 drives the actuator 16 through the analog drive circuit 15. Due to circuit characteristics such as the impedance of the analog drive circuit 15, there is already a deviation, so that the control voltage cannot accurately move the objective lens 17. to the required position, so as to affect the quality of read and write of the optical drive, or even exceed the maximum allowable movement range and crash the read head

Therefore, the movement offset of the prior art actuator still has the problem of correction to be solved urgently

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