Optical record medium and optical record method thereof

An optical recording medium, a technology for recording marks, applied in the directions of optical record carriers, optical recording/reproducing/erasing methods, optical recording heads, etc., can solve problems such as difficulty in multi-level recording

Inactive Publication Date: 2002-05-01
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In practice, it is extremely difficult to perform multi-level recording with more than 5 stages by changing the laser power

Method used

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  • Optical record medium and optical record method thereof
  • Optical record medium and optical record method thereof
  • Optical record medium and optical record method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0038] First, the principle of this embodiment will be described.

[0039] figure 1 In , the recording marks formed when a virtual recording unit is irradiated with a laser beam at a certain power for a maximum irradiation time T (the maximum time that can be occupied by recording of each virtual recording unit: this is called the allowable irradiation time) are shown. The reduced state of light reflectance of the virtual recording unit (solid line O) versus time.

[0040] As shown by the solid line O, when the laser beam is irradiated with a constant power, the light reflectance in the initial time zone A hardly decreases. Whereas, in the middle region B, the light reflectance tends to decrease, and the rate of decrease also increases with time. In the end region C, its decreasing speed tends to decrease slowly.

[0041] When the irradiation time is set in multiple steps and the laser beam is irradiated on the dummy recording unit to form recording marks (low light reflect...

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Abstract

An optical recording medium, which is constructed in a manner that a recording mark is formed on the recording layer by irradiating a laser beam so as to record information, the recording layer being continuously formed in a relative moving direction to the laser beam with plural virtual recording cells, each of which has an arbitrary unit length and a unit width perpendicular to the unit length in the relative moving direction, five stages or more irradiation times being set with respect to the virtual recording cell so that the irradiation time becomes long successively from the first to final stages, a power average value of laser beam in a specific irradiation time of the plural-stage irradiation times being set so as to become larger than a power average value of another irradiation time longer than the specific irradiation time, and recording marks to the virtual recording cell being formed in the virtual recording cell and giving five stages or more different optical reflectance to the virtual recording cell to the virtual recording cell when the laser beam is irradiated to the virtual recording cell. The optical recording medium having recording marks formed at multiple stages.

Description

technical field [0001] The present invention relates to an optical recording medium and an optical recording method for recording information by forming recording marks by irradiating laser beams. In particular, it relates to a technique for recording data in multiple levels by forming a plurality of recording marks in different states. Background technique [0002] Compared with the original method of recording data by changing the length of the reproduced signal (the length of the reflection signal modulation part) of the original optical recording medium into a multi-level recording data, by switching the depth of the reproduction signal (modulation degree of the reflection signal) to multi-level, Studies on a method of recording a plurality of data in each signal of the same length are increasing. [0003] According to this optical recording method, since a plurality of data can be recorded in the depth direction as compared with the case of recording binary data based ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/244G11B7/0045G11B7/007G11B7/013G11B7/125G11B7/126G11B7/24
CPCG11B7/24088G11B7/0045G11B7/126G11B7/00456
Inventor 塚本修司
Owner TDK CORPARATION
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