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Optical information recording medium and optical information processing apparatus

a technology of optical information and recording medium, which is applied in the field of optical information recording medium and optical information processing apparatus, can solve the problems of occurrence of remarkable signal errors, inability to evaluate the quality of reproduction signals, and inability to achieve good ber values by using the generally-used prml decoding method

Inactive Publication Date: 2010-10-07
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Enables high-quality, versatile signal decoding for random patterns with marks shorter than the resolution limit, achieving better bER values and enabling super-resolution reproduction with existing non-super-resolution medium reproducing apparatuses by adjusting laser power.

Problems solved by technology

However, with the optical information recording medium disclosed in Patent Literature 1, evaluation of a reproduction signal quality is not carried out in a case where information is recorded by use of the random pattern.
When information is recorded to the optical information recording medium disclosed in Patent Literature 1 by use of a random pattern including marks having a length not longer than a resolution limit, such a problem occurs that signal reproduction which attains a good bER value cannot be carried out by use of the generally-used PRML decoding method.
It is well known that occurrence of a remarkable signal error is a substantial problem unique to a conventional super-resolution reproduction, as also described in Non Patent Literature 2.
Hence, such a reproduction cannot be carried out with a highly versatile decoding method and reproducing apparatus.
In other words, this new technique lacks versatility.
Moreover, the signal processing disclosed in Non Patent Literature 1, although not clearly described, carries out reproduction by means of a new PRML signal decoding method that assumingly causes high costs and high electricity consumption.
If this new PRML signal decoding method is not used, signal reproduction capable of attaining a good bER value cannot be carried out for information recorded as a random pattern that includes marks having a length not longer than a resolution limit.
That is to say, it is not possible to carry out signal reproduction capable of attaining a good bER value by use of a generally-used PRML decoding method.
Thus, this method lacks versatility.
As described above, with the conventional techniques, there has been the problem that signal reproduction capable of attaining a good bER value by use of a very versatile general PRML decoding method cannot be carried out for information recorded in a random pattern that includes marks having a length not longer than a resolution limit, which such mark length allows further high density recording.

Method used

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  • Optical information recording medium and optical information processing apparatus
  • Optical information recording medium and optical information processing apparatus
  • Optical information recording medium and optical information processing apparatus

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0077]One embodiment of the present invention is described below with reference to FIGS. 1 through 6. In the present embodiment, an arrangement is exemplified in which information is recorded on an information recording layer by forming pre-pits on the information recording layer, thereby causing the information recording layer to be uneven in level. The information recording layer may be arranged so as to record information by including a recording film made of phase change material. With the phase change material, phase change occurs between a crystalline state and a non-crystalline state due to irradiation of recording light.

[0078]First is a description explaining a schematic arrangement of an optical information recording medium (optical disk) 1 of the present embodiment, with reference to FIG. 1. FIG. 1 is an explanatory view illustrating a cross section of the optical information recording medium 1 of the present embodiment. As illustrated in FIG. 1, the optical information re...

example 1

[0096]The following description explains Example 1 of the optical information recording medium in the present embodiment. The optical information recording medium of Example 1 includes: as a light-transmitting layer 10, a polycarbonate film (film thickness: approximately 80 μm) and a transparent sticky resin layer (film thickness: approximately 20 μm); as an information recording layer 20, a reproduction film (film thickness: 60 nm) made of zinc oxide and a reflective film 22 (film thickness: 7 nm) made of tantalum (Ta); and as a substrate 30, a polyolefin-based resin substrate. Moreover, as illustrated in FIG. 1, the optical information recording medium 1 in Example 1 is of a stacked arrangement in which the light-transmitting layer 10, the information recording layer 20, and the substrate 30 are stacked in this order from a side A from which light (reproducing light) is incident. More specifically, the polycarbonate film, the transparent sticky resin layer, zinc oxide, tantalum (T...

example 2

[0128]First described is Example 2 of the optical information recording medium 1 of the present embodiment. The optical information recording medium 1 of Example 2 has an arrangement common to the optical information recording medium 1 of Example 1, except that titanium (Ti) is used instead of tantalum (Ta). In other words, the optical information recording medium 1 of Example 2 includes a reflective film 22 (film thickness: 7 nm) made of Ti, instead of the reflective film 22 (film thickness: 7 nm) made of Ta as in the optical information recording medium 1 of Example 1.

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Abstract

This invention allows super-resolution reproduction with which a better bER value is attainable, when information is recorded by a random pattern including a mark length not longer than a resolution limit, by use of a highly versatile signal decoding method.Information is recorded as marks and spaces coded by RLL(1,7) modulation, which each of the marks and spaces have one of, a plurality of lengths, and 2T marks and 2T spaces of the marks and spaces being formed are shorter than 0.12 μm. An information recording layer (20) includes a reproduction film (21) and a reflective film (22) which are provided in this order from a side from which reproducing light is incident, which reproduction film is made of (i) zinc oxide, (ii) strontium titanate, (iii) titanium oxide, (iv) cerium oxide, or (v) a material including at least one of the (i) through (iv), and which reflective film is made of tantalum or titanium.

Description

TECHNICAL FIELD[0001]The present invention relates to an optical information recording medium capable of optically recording and reproducing information, and an optical information processing apparatus for reproducing the information recorded on such an optical information recording medium.BACKGROUND ART[0002]There has conventionally been a high demand for optical information recording mediums to have high density and large capacity, due to the development in information communication technology and multimedia technology as well as the highly information-based trend. However, an upper limit of the recording density in an optical information recording medium is limited generally by a spot diameter of an optical beam that records or reproduces information. This is because a reduction in length of a recording mark diameter so as to attain high density in the optical information recording medium causes a spot region to include a plurality of marks, thereby causing difficulty in separate...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G11B7/00
CPCG11B7/00736G11B7/24065G11B7/252G11B7/258G11B20/10009G11B20/10046G11B20/18G11B20/10481G11B20/1217G11B20/1426G11B2220/2541G11B2220/2579G11B20/1012
Inventor MORI, GOYAMADA, HIROHISAYAMAMOTO, MASAKIHARADA, YASUHIROTAJIMA, HIDEHARUMAEDA, SHIGEMIMURAKAMI, YOSHITERU
Owner SHARP KK