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Device and method for initializing optical disks and information recording method

An initialization method and initialization technology, applied in the direction of optical recording/reproduction, optical recording head, optical recording carrier, etc., can solve problems such as difficult to achieve, achieve the effect of increasing speed, expanding margin, and ensuring initialization

Inactive Publication Date: 2007-09-26
HITACHI COMPUTER PERIPHERALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0034] The areas illuminated by the forward and backward beams separately must be completed, but this is difficult to do in practice

Method used

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  • Device and method for initializing optical disks and information recording method
  • Device and method for initializing optical disks and information recording method
  • Device and method for initializing optical disks and information recording method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Use the optical system shown in Figure 1 to initialize the phase change disc. The number of beams is 3 beams, and their power ratios are exactly the same, and the laser light is modulated into a pulse shape. The laser wavelength of the laser 102 is 830 nm, and the numerical aperture of the objective lens 109 is 0.5. Take the length of the sheet beam in the longer direction as 50 μm. Disc ready for optimum drive line speed V drive Three discs of 5m / s, 10m / s and 20m / s. For these discs at their respective linear velocities V drive to initialize. The duty cycle of the pulse is 50%, changing the pulse frequency f power Perform initialization, record random data in the initialized area, and measure speed deviation. In the power of the pulse, Plow is taken as the minimum power necessary for autofocus, that is, 100mW. Best results for Phigh of 1 spot for each disc, V drive Discs with speeds of 5m / s, 10m / s and 20m / s are 700mW, 1000mW and 1400mW respectively. The detecti...

Embodiment 2

[0072] Here, the case of combining pulse initialization and DC light initialization will be described.

[0073] Fig. 13 shows the optical system used here. The difference from the optical system in Figure 1 is that two lasers are set, one of which emits pulsed light, and the other emits direct current light. The beam projected by the pulse is divided into three beams by the diffraction grating 1305, and the beam projected by the direct current is not divided into one beam. After three pulsed beams, a DC projection beam is irradiated on the disc. Disc In the first embodiment, V drive Using a 5 m / s optical disc, the pulse conditions, pulse power and beam distance are the same as those in the first embodiment. The DC optical power is 500mW, so that the DC optical power is also lower than P high The power is to prevent film degradation caused by direct current light irradiation.

[0074] Fig. 14 shows the speed variation during overwriting on this optical disc, and it can be ...

Embodiment 3

[0077] Here, a case where light is modulated into a sinusoidal wave in the optical system of FIG. 1 is described. Sine wave frequency f power Take it as V as in Example 1 drive / (2×10 -6 ). The optical system, optical disc, initialization linear velocity and power are the same as those of the second embodiment. Fig. 13 shows the speed deviation caused by overwriting in this case, and it can be seen from the result that even optical modulation using a sine wave is possible.

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Abstract

The objective of this invention is to solve a problem that it becomes difficult to optimize initial conditions accompanying speed up of recording in the case of a conventional phase-change disk initializing device. An initializing beam is formed into a pulse, and a drive linear velocity Vdrive (m / s) and a pulse frequency fpower (Hz) are set to satisfy Vdrive*fpower>=2*10-6. As a result, the speed of initializing a phase-change disk and the margin of irradiation laser power are increased, and initialization securing the uniformity of an initialized state becomes possible.

Description

technical field [0001] The invention relates to a phase-change optical disc initialization device and an initialization method. Background technique [0002] Currently, the phase-change recording method is used in rewritable optical discs such as CD-RW, DVD-RAM, DVD±RWH, and Blu-ray Disc. The so-called phase-change recording refers to the recording data in which amorphous marks are formed in a crystalline recording film. Way. Although an optical disk is produced by forming a thin film on a polycarbonate substrate by a sputtering method, the recording thin film produced by the sputtering method is in an amorphous state. Therefore, the recording film of the optical disk must be made into a crystalline state before shipment, and this process is called initialization. [0003] Generally, laser irradiation is used to initialize a phase-change optical disc. FIG. 2(a) is a block diagram of an optical system of an initializer. Now, the uninitialized phase-change optical disc 201 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/00G11B7/0055G11B7/135G11B7/26
Inventor 新谷俊通峰邑浩行佐保田英司荻野义明石川范幸
Owner HITACHI COMPUTER PERIPHERALS CO LTD
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