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Optical recording medium,reproducing method and apparatus

A technology of optical recording medium and playback device, applied in optical recording/reproducing/erasing method, optical record carrier, optical recording system, etc.

Inactive Publication Date: 2006-06-07
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no document disclosing or suggesting the relationship between the recording waveform and the recording waveform when recording on a dye-based write-once DVD medium with one pulse and performing high-linear-speed recording.

Method used

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  • Optical recording medium,reproducing method and apparatus
  • Optical recording medium,reproducing method and apparatus
  • Optical recording medium,reproducing method and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～11 and comparative example 1～2

[0152] Using the prepared optical recording medium (DVD+R), a recording and reproducing test was performed as follows.

[0153]

[0154] In Examples 1 to 7, a semiconductor laser with an oscillation wavelength of 660 nm and a beam diameter of 0.9 μm was used for the optical recording medium, and the bottom jitter was performed under the recording conditions and recording linear speeds shown in Table 2 below while tracking. ) record the EFM signal with the minimum recording power (the minimum bit length is about 0.4 μm), and replay the recording position to obtain the jitter value, asymmetry, and PI error (error) number. Figure 4 ~ Figure 7 Indicates the waveform of the recording laser. In addition, pulse lengths of line speed 21m / s and 28m / s use Figure 4 ~ Figure 7 pulse length, but the present invention is not limited thereto.

[0155] In Example 8, the amount of cooling was set to 0.4T, which is shorter than 1 / 6 of the shortest space length 3T of the present invention,...

Embodiment 12 and comparative example 3～5

[0164] In Example 12, the optical recording medium was tracked using a semiconductor laser with an oscillation wavelength of 660 nm and a beam diameter of 0.9 μm, while recording under the recording conditions and recording speeds described in Table 3 below, and under the conditions corrected in Table 1. The lower bottom and jitter are recorded with an EFM signal (minimum pit length about 0.4 μm) at an extremely small recording power, and the position is played back to obtain the jitter value, asymmetry, and PI error number. Table 3 shows the results.

[0165] In Comparative Examples 3 to 5, except that the size of the land pre-pit signal (LPPb) of the LPP format implemented by DVD+R was wobbled (changed) the trial production condition stamper and the molded substrate were the same as in the Examples, An optical recording medium (DVD-R) was produced as a trial, and the same evaluation as in Example 12 was performed. Table 3 shows the results.

[0166] record line ...

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Abstract

The object is to provide a method of recording and reproducing a dye-based write-once DVD medium capable of obtaining a good recording waveform when recording at a high linear speed. To this end, a method for recording and reproducing a dye-based write-once DVD medium and a recording and reproducing device are provided. In the recording layer of the medium, the output of each mark other than the shortest length mark is increased for a certain period of time using both the front end and the rear end of the heating pulse, and the pulse light power at the front end of the heating pulse is higher than that at the rear end. Recording is performed using one pulsed light with high optical power, and the recording is reproduced by playback light.

Description

technical field [0001] The present invention relates to a recording and reproducing method, a recording and reproducing device, and an optical recording medium using a dye-based write-once DVD medium. Background technique [0002] Currently, the development of DVD-R, which is the next generation of large-capacity optical discs, is advancing. For the improvement of recording capacity, development of recording materials for miniaturization of recording pits, adoption of image compression technology represented by Moving Picture Experts Group-2 (MPEG2) and recording pits are required as key technologies. Development of technologies such as shortening the wavelength of semiconductor lasers for pit reading. [0003] So far, as semiconductor lasers in the red wavelength band, AlGaInP laser diodes in the 670nm band for barcode readers and measuring instruments have only been commercialized. However, with the increase in the density of optical discs, red lasers are really widely us...

Claims

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Application Information

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IPC IPC(8): G11B7/0045G11B7/007G11B7/246
Inventor 野口宗佐藤勉户村辰也植野泰伸
Owner RICOH KK
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