Disc label surface contrast compensation method

Abstract

The invention relates to a disc label surface contrast compensation method. The method comprises the following steps of: selecting a compensation working space based on a contrast curve, and burning a label in an offset mode; detecting reduction of laser power, calculating focusing offset compensation by utilizing a focusing offset compensation formula, compensating lower limit focusing offset to form compensated focusing offset, when the compensated focusing offset is in the compensation working space, burning the label by adopting an offset compensation mode, when the compensated focusing offset is not in the compensation working space, burning the label by adopting an upper limit compensation mode, and maintaining contrast of a disc label by utilizing dynamic compensation focusing offset.

Description

technical field [0001] The invention relates to a method for burning an optical disc label, in particular to a method for burning a label on the optical disc label surface by using a reading head. Background technique [0002] Light Scribe Disc (Light Scribe Disc) is a material that is heated and discolored on the label surface, and directly uses the read head of the optical drive to irradiate high-power laser light to locally change the contrast of the label surface to form the label pattern required by the user for decoration. And mark the content title of the disc. [0003] Such as figure 1 Shown is a schematic diagram of a known CD-ROM recording label. The known optical drive utilizes a moving reading head 1 to carry and drive an objective lens 2 to focus and project laser light onto the label surface 4 of the optical disc 3 . Since the reflectivity of the coating on the label surface 4 to the laser light is insufficient, it is impossible for the data surface 5 of the...

AI Technical Summary

Problems solved by technology

[0005] However, in order to avoid excessive current damage to the read head and shorten the service life of the read head, the known optical drive presets the current limit (Current Limit). After the current limit is reached, the laser power cannot be increased to protect the read head.

Therefore, the previous technology of improving the contrast of the label by increasing the laser power is not only easy to cause the reading head to reach the current limit for the laser that has burned the label with high power, but also for the laser power that gradually decreases as the temperature increases. Due to the current limitation, the power cannot be increased any more, so the contrast of the label after subsequent programming is reduced. The uneven label not only affects the appearance, but even makes it impossible to clearly identify the label.

The previous technology obviously cannot be used in the current limited situation, but there are limitations on its use

Therefore, there is still the problem of uneven contrast on the recording label of the optical disc to be solved urgently

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