TWI220521B - A structure for rewritable multi-level phase-change optical recording media - Google Patents

Abstract

The invention provides a structure of multi-level reflection for rewritable phase-change optical recording medium. The characteristic is that the material of the recording layer of the structure is InxSbyTez, and the variable x is among 5.1 to 35.0(%), the variable y is among 57.5 to 71.7(%), and the variable z is among 7.5 to 23.2(%). This material has improvements which are high reflection ratio, discriminating partial recrystallization, high phase-change rate, and easily mark edge control, so it is suitable for multi-level reflection optical recording disk to increase data density, and the storage capacity of the recording medium.

Description

1220521 V. Description of the invention G) [Technical field to which the invention belongs] (Pha This invention is about a rewritable phase change type optical recording medium, and Change Erasable Optical Recording Media. Increase the structure of dense and phase-change optical recording media per unit area. [Previous technology] As the demand for multimedia continues to improve, the project is previewed due to its high capacity and rewritable functions. Phase-change optical discs have low reflectivity and short-pulse laser irradiating non-B phase structures in the crystalline phase and amorphous phase junction amorphous phase. Does not have enough anti-level recording technology to improve the development of Jifeng, which can be roughly developed. For the pre-record market to germinate to low-growth future, it must use laser light to convert between structures. Identification of 0,1 'makes the disc local element wipe is crystal, and lower the element. Comparison of the emissivity of the recording layer of the optical disc for the use of 1 technology < Multi-level inverse division of capacity: Rewritable phase-change optical disc with the capacity and quality of the recording medium, which has the characteristics of being portable and portable, and possessing impossibility Replaced fields of application and market discs make the recording layer material with high reflectance and number by crystalline phase. The bit writing system uses high power melting and rapid cooling to form a low-power laser pulse irradiation. The power laser irradiation is used to detect the bit material due to the small reflectance contrast. Multi-order reflectivity discs (Multi- > Proposals to use new encoding and record rate disc technology are booming

Page 6 1220521 V. Description of the invention (2) I. Pit Depth developed by Calimetric, USA

Modulation (PDM); 2. Run-Length-Limited Modulation technology developed by the University of Arizona. In order to correspond to the new recording technology used by this Multi-Level Recording, the type of recording track will be different from the traditional s-recorded track with only two orders of reflectance, and at least = order three or more orders of reflectance are required to reach the signal Level to increase the recording density per unit area. As for how to form a multi-order reflectance, the current practice can be roughly divided into two types: First, the use of recording mark size effects, such as TMMR (tangential mark-size modulation by recrystallization) technology, is to embed smaller and different length laser spots than laser light spots. Recording tracks, and MRWM (mark radial width modulation) are recording tracks of a fixed length but different widths. During reading, the reflectivity of the laser light spot within a fixed time will be different due to the difference in the size of the recording track; 2. Using the characteristics of partial crystal i ine materials, # controlled by the writing power The material forms different degrees of crystals to obtain different wattage efficiencies. At present, there are no embodiments in the market that can partially crystallize materials that are specifically applied to rewritable phase change optical discs. Based on this, the present invention proposes a new recording layer material with partial crystallization effect, which can be used in future multi-level reflectivity optical discs using MuHi-Level ^ ⑶ ^ 丨 technology.

1220521 V. Description of the invention (3) [Summary of the invention] FIG. 1 is a structural diagram of an overwritable phase change type optical recording medium according to the present invention. The substrate 10 is made of Polycarbonate (PC), PVC, or ρ Μ MA (ρ 1 y WLe thy 1 M ethacry 1 ate) with a thickness of 0.6 mm or 1.2 mm, and the depth of the groove 100 is 30 to 60 ( nm), and the width of the ditch log ranges from 0.25 to 0.74 (_). If the thickness of the substrate 10 is 0.06 mm, a layer of glue must be applied by screen printing, and then a dummy sheet is glued with this sheet to form an optical disc with a thickness of h 2 _. The insulating layer 12 is used to effectively separate the substrate 10 and the recording layer 14 to prevent the substrate 10 from being damaged during the writing operation. A 1 having a thickness ranging from 70 to 200 (nm) can be used. 203, AIN, ZnS (80%)-SiO2 (20%) and other materials, wherein the composition ratio of ZnS to SiO2 is 8 ·· 2. The recording layer 14 of the present invention uses an InxSbyTez material, in which the value range of the variable X is 5 ^ ~ 35.0 (81:%), the value range of the variable 7 is 5 7.5 ~ 71.7 (81:%), and the value of the variable 2 The range is 7.5 to 23.2 (in%), and the thickness range is 1′0 to 30 (nm). The heat-retaining layer 16 is used to store the laser energy when the laser wavelength is irradiated in the red light band (1 = 650 nm or 780 rim), and the material of the recording layer 14 is changed from amorphous to crystalline The energy required at the time of A, the second degree range is 10 ~ 20 (⑽) A1 203, A1N, znS (80%) _ Si〇2 and (20%) and other materials' wherein the composition ratio of ZnS and Si02 is 8: 2. The Trans-18 series uses gold, silver, and other alloy materials with a thickness ranging from 80 to 120 (⑽). The rewritable phase change light of the present invention uses two recording media, In5 0Sb50 and Sb70Te30, as the best embodiment of alloy dry fishing. The material is co-sputtered.

1220521 V. Description of the invention (4) Preparation 'By changing the power of DC or RF magnetic current money applied to the two alloy dry materials In50Sb50 and Sb70Te30, privately change the coating composition to prepare the required InxSbyTez alloy composition . In addition, the insulation layer 2, the heat preservation layer 16, and the reflection layer 18 can also be made by a sputtering machine, and the thickness thereof can be controlled by sputtering 'current and sputtering time. The usable laser n wavelength range of the present invention is 600 to 78 0 (nm), and the numerical aperture range of the optical lens 13 is 055 to 0.70. In order for those skilled in the art to understand the purpose, characteristics and Work

The effect of the present invention will be described in detail through the following specific embodiments in conjunction with the accompanying drawings: X [Embodiment] The first specific embodiment of the present invention will be disclosed as follows. The selection substrate is as follows: The pc material has a thickness of 12 mm; the insulating layer 12aZnS (80%)-si02 (20%) material has a thickness of 90 nm; and the recording layer 14 is 4 23 · 2 Sb 62 · 8Te. 14 materials with a thickness of 20nm; heat-retaining layer 16 with ZnS (80%)-Si02 (2 materials' with a thickness of 15nm; reflective layer 18 with a silver material and a thickness of 90nm. The invention uses a splatter Making insulation layer 1, 2, recording layer 1, 4, heat-retaining layer 1, 6, and reflective layer 1, 8; thickness is controlled by sputtering current and sputtering time), Beyer, and Chengzhi multi-level reflectance phase change optical discs Using a red laser (1 = 780 nm), a sigma-type machine writes a single-length crystalline record and measures 5 different reflectances, as shown in Fig. 2. The pc of the present invention will be disclosed again. The second specific embodiment is as follows: selecting the base series 1 0… the material 'its thickness is 1.2 mm; the insulating layer 12 is ZnS (80%)-Si02

1220521 V. Description of the invention (5) (20%) The material has a thickness of 90 nm; the recording layer 14 is a ^^ 51 7i.7Te 23 · = material whose thickness is 20 nm; the detailed thermal layer 丨 is ZnS (80%) — SiO2 (20%) material with a thickness of 15 nm; the reflective layer 18 is made of silver and has a thickness of 90 ㈣. In the present invention, a multi-level reflectance phase-change optical disc with a sputtering key and a sputtering time controlled by a sputtering key machine is used to produce an insulating layer 12, a recording layer, a thermal insulation layer 2 1 6 and a reflective layer 18. Light laser (1 = 780. Qiao Xuan writes a single-length crystalline record and measures 9 different reflectances, as shown in Figure 3. The characteristics of the present invention are further summarized as follows. • The present invention The material of the recording layer is poor, and part of the crystallization effect is obvious. At the same time, $ :: = has the advantages of high anti-tracking edge control and other advantages. It is very suitable for people = mesh = fast speed, recording layer for recording. Ισ is used in Multi-level reflectivity optical discs • The present invention can overwrite phase change reflectivity and has high industrial applicability. Because == structure has multi-level personal computers, notebooks or === smart discs can be applied to home companies, enterprises Large-scale data storage = storage, can also be applied to consumer electronics products. In addition, it is also applicable to low-cost requirements. Although the present invention has been formulated with a relatively high degree of gamma, any familiarity as above, but it is not used within the fence. Make various changes: away from the essence of the invention & a mp; the scope of patent application attached to Dangdangshi; Jin Jie ::: Guarantee of the present invention, page 10, 1220521, simple illustration [Schematic illustration] Figure 1 is an overwriteable phase-change optical record of the present invention FIG. 2 is a structural diagram of a media; FIG. 2 is a test result of a first specific embodiment of the present invention; FIG. 3 is a test result of a second specific embodiment of the present invention.

Description of the drawing number ·· 10 substrate 100 ditch 11 laser 12 insulation layer 13 optical lens 14 recording layer 16 thermal insulation layer 18 reflective layer

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Claims (1)

f write phase change type optical recording medium with a structure with multi-order reflectivity, which is composed of at least a substrate, a thermal layer and a reflective layer, the laser beam generated by the mirror, the light recording medium, It is characterized by an insulation layer, a recording layer, a security system, and the use of laser light to pass through an optically transparent 5H green layer to record or read information in: § 录 recorded layer system I η XS by Ding 5.1 ~ 35,0 (at%), and expected the two old 71 7,, 0 / Λ. And the value range of the variable y is 57.5 ~ 7l.7 (at / 〇, and the value of the variable z is Su. To It also has a dry circumference of 7.5 to 23.2 (at%). The structure of a rewritable phase change optical recording medium having multi-order reflectance as described in item 1 of the scope of patent application, wherein the substrate is a Polycarbonate), or pVC, or PMMA (polly Methyl Methacrylate) material, the thickness of which is 〇6_ or 12_, and the depth of its rail groove ranges from 30 to 60 (nm). The color range is 0.25 to 0. 74 (ππη). 3 · The structure of an overwritable phase change type optical recording medium with multi-order reflectance as described in item 1 of the scope of patent application Wherein, the insulation layer is A1 203 or A1N or ZnS-Si02 material with a composition ratio of 8 · 2, and its thickness ranges from 70 to 120 (nm). 4 · As described in item 1 of the patent application -Order reflectivity overwritable phase-change optical recording medium and structure 'where the thickness of the recording layer is in the range of 10 to 30 (nm). Structure of rewritable phase change optical recording medium, wherein the heat retaining layer is A 1 203 The 12th 2nd ZnS-Si02 material has a thick coating, which can be covered with multi-order reflectance, wherein the reflective layer is gold, or an alloy material, and the thickness range is described with multi-order reflection. The coverage of the laser's wavelength can be described as a multilayer with a multi-order reflectivity, and the numerical value of the optical lens is described as the multilayer with a multi-order reflectivity, where the I η XS by Tez material 5 0Sb50 material and Sb70Te30 material 6 7 9 izzuyzi 6. Patent application scope, or A1N, or composition ratio is 10 ~ 20 (nm) in the degree range, as described in item 1 of the patent application scope The medium is silver, or copper, or aluminum, or other ~ 120 (nm). The phase-change type optical recording medium written in the first patent scope of Shenyan has a structure of _ ~ 780 (nm). The phase aperture type optical recording medium as described in item 1 of Shenjing's patent range has an aperture range of 0.55 ~ 〇_70, and the K-type optical recording medium as described in item 1 of Shenjing's patent range is bound by Co-sputtering results from the preparation of I η. Page 13