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Writing device and its method

A technology of writing device and generating device, applied in optical recording/reproducing/erasing methods, beam sources, optical recording systems, etc., can solve the problems of large differences in the accuracy of delay line devices and difficulty in realizing delay lines, etc.

Inactive Publication Date: 2004-08-11
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if you try to use the same delay line to support double-speed writing, the problem is that it is difficult to implement such a delay line because it requires a very large number of gates.
[0029] Another problem is that the control of the laser drive pulses in the direction of the time base is difficult to implement with high precision in the delay line since the delay line is usually prone to large variations in device precision, such as delay time with temperature

Method used

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  • Writing device and its method
  • Writing device and its method
  • Writing device and its method

Examples

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Embodiment Construction

[0057] An optical disk drive (writing and reproducing apparatus) applicable to CD-R and CD-RW will be described below as an embodiment of the present invention.

[0058] Descriptions are made in the order listed below.

[0059] 1. CD-ROM drive configuration

[0060] 2. Configuration and delay processing of write policy units

[0061] 3. Measurement circuit configuration and measurement processing

[0062] 1. CD-ROM drive configuration

[0063] CD-R is a write-once optical disc medium using organic dyes in the recording layer, while CD-RW is a rewritable optical disc medium using phase change technology.

[0064] refer to figure 1 The configuration of an optical disc drive capable of writing data to or reproducing data from optical discs such as CD-R and CD-RW according to this embodiment will be described.

[0065] exist figure 1 Here, the optical disc 90 is a CD-R or CD-RW. As with other examples of the optical disc 90 used here, the optical disc drive can also repro...

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Abstract

In a writing device for writing data at 1-time or higher recording rates, a first delay circuit capable of variably controlling a delay time in units of a relatively long time and a second delay circuit capable of variably controlling a delay time in units of a relatively short time are employed in a combined manner. A laser drive pulse can be controlled in the direction of the time base with high accuracy corresponding to any recording rates ranging from 1-time to higher, e.g., 8- or 12-time, speeds without using very large number stages of delay gates.

Description

technical field [0001] The present invention relates to a writing device for writing recording data into a recording medium using a laser beam modulated according to the recording data (ie, recording according to light modulation). Background technique [0002] When data is written in a recording medium such as an optical disc according to light modulation recording, laser light is generally emitted in pulses to perform thermal control for forming satisfactory pit (mark) shapes on the optical disc. [0003] Specifically, by setting the pulse waveform to be suitable as a laser driving pulse for driving the laser and controlling the duration of each pulse in the time base direction, the laser irradiation period can be controlled. [0004] Known data-writable optical disc media are write-once optical discs such as CD-R (CD-Recordable=CD-WO) and rewritable optical discs such as CD-RW (CD-Rewritable). In these CD discs such as CD-R and CD-RW, generally an EFM signal is generated...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/125G11B7/004G11B7/0045G11B7/126
CPCG11B7/0045G11B7/126G11B7/004
Inventor 盛一宗利番场光幸佐佐木敬
Owner SONY CORP