Optical disc recording device

A technology for recording and recording marks on optical discs, which is applied to optical recording heads, optical recording systems, optical recording/reproducing/erasing methods, etc. equivalence problem

Inactive Publication Date: 2008-11-12
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the conventional method may not be able to predict the learning convergence level and the improvement of learning accuracy, and it may not be possible to find the optimal setting.
[0012] In addition, when it is desired to cope with the deviation of a specific device, a learning algorithm corresponding to the output characteristics of the specific device is required, and it is impossible to use a single learning algorithm to correspond to all devices.
In addition, when it is desired to cope with the variation of all devices, the learning to obtain the optimal value may become complicated, and the optimal setting may not be obtained.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0128] FIG. 1 is a block diagram showing the configuration of an optical disc recording device according to Embodiment 1 of the present invention.

[0129] In FIG. 1, the optical disc recording apparatus 100 of the present embodiment 1 has: a pickup 2 that emits laser light to the optical disc 1 to write and read information on the optical disc 1; a laser control system 3 that controls the output power of the laser light. control; a phase detection setting system 4 for controlling phase detection and phase setting of the write strategy; and a record data generation system 5 for generating record data.

[0130] In the pickup 2 , a laser diode (LD) 7 is driven with a current by a laser diode (LD) driver 6 , and laser light is emitted from the LD 7 to the optical disk 1 . The reflected light of this laser light is received by the photodetector 8 as a light receiving element, and the intensity of the received light is converted into a voltage level by the photodetector 8 and outpu...

Embodiment approach 2

[0206] Hereinafter, an optical disc recording device according to Embodiment 2 of the present invention will be described.

[0207] In the optical disc recording apparatus according to the second embodiment, in the optical disc recording apparatus 100 according to the first embodiment described above, the multi-pulse output period is set to the basic period 2T of the mark / space length.

[0208] In the optical disk recording apparatus according to Embodiment 2, for the case of 2T multipulse when the output cycle of the multipulse is set to 2T which is the basic period of the mark / space length, use Figure 14 to illustrate. In addition, the configuration and basic operation of the optical disc recording device according to Embodiment 2 are the same as those of the optical disc recording device 100 according to Embodiment 1 described above.

[0209] exist Figure 14 Among them, (a) represents the recording waveform NRZI, (b) represents the laser output, and (c) represents the o...

Embodiment approach 3

[0220] Hereinafter, an optical disc recording device according to Embodiment 3 of the present invention will be described.

[0221] The optical disc recording device according to Embodiment 3 performs recording by a write strategy consisting of block pulses formed by one pulse when forming one recording mark in the optical disc recording device 100 according to Embodiment 1 described above.

[0222] Hereinafter, in the optical disc recording apparatus according to Embodiment 3, the operation when 3T marks and 3T spaces are output by setting the output of the block pulse to 1T which is the basic period of the mark-space length will be described with reference to FIG. 18 as an example. . In addition, the configuration of the optical disc recording device according to Embodiment 3 is the same as that of the optical disc recording device 100 according to Embodiment 1 described above.

[0223] In FIG. 18, (a) shows the recording waveform NRZI, (b) shows the laser output, and (c) s...

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Abstract

The present invention provides a CD recording device. In data recording, a laser output pulse is measured and a write strategy phase setting is corrected and recorded so as to output a pulse with a correct phase. While laser is emitting a constant power in a laser control system, a write strategy phase setting is changed. A multi-pulse emitted light as a laser mark portion is voltage-converted by a photo-detector and averaged by an LPF. Temporal change with respect to the phase setting is measured / detected by a voltage level and the phase setting of the write strategy generation circuit is corrected / updated so that the measurement level is an ideal level.

Description

technical field [0001] The present invention relates to an optical information recording and reproducing device for a recordable information recording medium. Background technique [0002] Among information recording media, devices for recording and reproducing information, especially digital information, have attracted attention as means for recording and reproducing large-capacity data. Among them, as for the optical information recording medium that uses laser light to record data, there are write-once optical discs that can only be recorded once, rewritable phase change optical discs, and the like among the recordable optical information recording media. All of these perform recording on an optical disc by irradiating a beam of a semiconductor laser to a rotating disc to heat and melt a recording film. Depending on the intensity of the light beam, the attained temperature of the recording film and the cooling process differ, causing changes in the recording film. The r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/0045G11B7/125
CPCG11B7/00456
Inventor 伊佐地昭裕西川和彦薮野宽之
Owner PANASONIC CORP
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