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Method for preventing optical pick-up device and CD-disc from destroying

A technology of optical pick-up and optical disc, applied in optical recording/reproduction, instrument, head configuration/installation, etc., can solve the problems of objective lens 17 being damaged, optical disc 15 being damaged, and not applicable, etc., to protect the objective lens, The effect of protecting the disc and preventing it from being damaged

Inactive Publication Date: 2008-03-12
LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] In the case of a large NA, the problem is that the distance between the objective lens 17 and the optical disc 15 is too close, causing the objective lens 17 to be damaged due to the optical disc 15, or the optical disc 15 to be damaged due to the objective lens 17.
[0028] However, in NFR, the distance between the objective lens and the optical disc is about 60nm, so the existing method is not applicable

Method used

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  • Method for preventing optical pick-up device and CD-disc from destroying
  • Method for preventing optical pick-up device and CD-disc from destroying
  • Method for preventing optical pick-up device and CD-disc from destroying

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Embodiment Construction

[0059] Embodiments of the method for preventing an optical pickup and an optical disc from being damaged will be described in detail below with reference to the accompanying drawings.

[0060] Fig. 3 is a block diagram of the general composition of this optical disc recording and playback device. The signal track of the optical disc 101 is composed of planes and grooves. According to the different types of optical discs, not only the magnetic tracks of the flat magnetic track or the groove can record or play all data, And all data can also be recorded or played back on land and groove tracks.

[0061] At this time, the optical pick-up 102, according to the control of the servo control unit 106, makes the light beam condensed on the objective lens irradiate on the signal track of the optical disc 101, and after the light reflected from the signal recording surface is condensed on the objective lens again, in order to detect the focus error signal and the tracking error signal, ...

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Abstract

The invention relates to a method for avoiding the optical interrogation and CD mis-refreshing., which is to adjust the intervals among the focus servo, optical interrogation lens and CD under the optical system of the optical disc driver, and thus to prevent the mis-refreshing of the optical interrogation CD caused by contact of the lens and CD. The invention is characterized in increasing the distance between lens and CD in opposite directions on the optical interrogation device before the CD's spinning, which is to work out the predetermined distance offset between CD and the lens. The invention has the advantages of preventing the mis-refreshing of the high density CD and protecting the objective and CD in the field of portable storage device.

Description

technical field [0001] The invention relates to a method for preventing an optical pickup and an optical disc from being damaged. It refers to the method of adjusting the focus servo, the distance between the objective lens of the optical pick-up and the optical disc under the optical system of the optical disc drive, and preventing the contact between the objective lens and the optical disc to cause the optical pickup and the optical disc to be damaged. Background technique [0002] In general, an optical system similar to CDP, DVDP, etc. consists of the following parts: [0003] Spindle servo to rotate the disc; focusing servo to accurately irradiate the laser beam on the disc; tracking servo to correctly track the data track mounted on the disc; pickup plate servo for driving. [0004] Recently, due to the digitalization and large capacity of data, the storage medium has changed from magnetic tape to optical disc. At the same time, due to the increase in the recording de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/08G11B7/085
Inventor 吴相杰
Owner LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI
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