Method for measuring displacement gain value of light storage device and apparatus therefor

Abstract

This invention relates to a method for measuring shift gain values of a light storage device. The device includes a fetch head containing an object glass, first and second light sources on it, said object glass can focus the first light source on the first focal point and the second on the second focal point with a first distance from the first focal point, a drive voltage can alter positions of said object glass including: a, changing said drive voltage to alter position of said object glass, b, registering a first factor when said first focal point passes through a preset layer in the disc, c, registering a second factor when the second passes through said preset layer and d, computing a shift gain value with them.

Description

technical field [0001] The present invention relates to a method for measuring a displacement gain value, in particular to a method for measuring a displacement gain value of an objective lens displacement relative to a driving voltage used in an optical storage device. Background technique [0002] An optical storage device (optical storage device) is a common storage medium in today's computer systems. see figure 1 , figure 1 It is a simple block diagram of an optical storage device 100 in the prior art. The optical storage device 100 includes a spindle motor 110, an optical disc 120, a pickup 130, a signal processing unit 140, a focusing controller 150, A micro controller unit (MCU) 160 and a power driver (power driver) 170 . One or more different light sources (usually a CD light source and a DVD light source, not shown on the figure) are provided on the read head 130; an objective lens (object lens, not shown on the figure) is used to focus one of the light sources ...

AI Technical Summary

Problems solved by technology

However, due to the fact that in the process of producing optical storage devices, it is impossible to make every optical storage device manufactured have the same displacement gain value (partly because of the small difference in the focus actuator), in each optical storage device In the case of different displacement gain values, it is unwise to use a fixed displacement gain value as the reference data for controlling each optical storage device, and the control action of the focus actuator on the position of the objective lens will become inaccurate as a result.

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