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Method and apparatus for writing optical recording media

A technology for optical recording and media, applied in optical recording/reproducing/erasing methods, optical recording heads, optical recording carriers, etc., can solve the problem of unreliable stored information, no change in the nature of the recording device, and full consideration of the change in the nature of the recording medium, etc. question

Inactive Publication Date: 2004-02-11
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

A disadvantage of this known method is that the optimum power level determined by this method does not fully take into account the changes in the properties of the recording device and the changes in the properties of the recording medium
Therefore, using this optimum writing power may make storing information on the recording medium unreliable

Method used

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  • Method and apparatus for writing optical recording media
  • Method and apparatus for writing optical recording media
  • Method and apparatus for writing optical recording media

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Embodiment Construction

[0027] figure 1 A device and an optical recording medium 1 according to the invention are shown. The medium 1 has a transparent substrate 2 and a recording layer 3 distributed thereon. The recording layer includes a material suitable for writing information with light beams. The recording material can be, for example, magneto-optical, phase change, dye or any other suitable material. Information can be recorded on the recording layer 3 in the form of optically detectable areas, also called marks. The device comprises a light source 4 , such as a semiconductor laser, for emitting a light beam 5 . The light beam is focused on the recording layer 3 using the beam splitter 6 , the objective lens 7 and the substrate 2 . The medium can also be air incident, and the light beam is directly incident on the recording layer 3 without passing through the substrate. The light reflected from the medium 1 is converged by the objective lens 7, and after passing through the beam splitter ...

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Abstract

A method is described for setting an optimum write power for recording information on an optical recording medium. First a series of test patterns is written on the medium, each test pattern being written with a different write power. On reading the test patterns, the modulation of each read signal is determined. The modulations as a function of write power are curve-fitted to an analytic function. The normalised derivative of this function is determined analytically and is used to determine the value of the optimum write power for the medium.

Description

technical field [0001] The invention relates to an optical recording device for writing information on an optical recording medium with a light beam, and specifically relates to a method for setting the optimum writing power level of the light beam. [0002] The method includes a first step of writing a series of test patterns on a recording medium, each pattern is written with a different writing power level value, a second step of reading the patterns to form a corresponding read signal, and a third step from each read The value of the read parameter is obtained from the signal, and the fourth step is curve fitting to the value of the read parameter to obtain a function that defines the relationship between the writing power level and the read parameter. [0003] The invention also relates to a device for writing information on an optical recording medium, the device comprising a light source emitting a light beam with a controllable writing power level, a control unit for w...

Claims

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Application Information

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IPC IPC(8): G11BG11B7/1263G11B7/00G11B7/0045G11B7/007G11B7/125
CPCG11B7/1263G11B20/182G11B7/00454
Inventor A·J·登波伊夫
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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