TWI227014B - Method to control the life of reading times in an optical disc and its control layer - Google Patents

Abstract

The purpose of this invention is to provide a machine-readable optical disc whose reading times can be controlled. In order to achieve this purpose, a control layer, based on laser-induced phase transformation alloy, is placed in front of a reflection layer, where information is stored and encoded. Before initial reading of the disc, the control layer exists an amorphous structure and is transparent. However, after initial reading, the incident layer beam radiation provides enough energy to across the energy barrier of phase transformation, therefore, the control layer becomes metal-like crystal structure, which acts like a new reflective layer, and the further reading of the reflective layer is inhibited.

Description

V. Description of the invention (1) [Technical field to which the invention belongs] The technical field to which the present invention belongs is mainly the production of pre-recorded optical discs such as software. π U㈣ [Previous technology] Since 1982, the first generation of CD-DA (Compact Disc-Digital Audio) 2 discs] Since the beginning of the world, and after these years, because of its low manufacturing cost, it has to be = This ㊁ 乐 ΐΐ 由 ί = ΐ! Long life and other advantages, not only quickly swept the entire bathroom sound quality, so 'because the optical disc can output high-quality pictures;-very much look at = vigorous development' However, in the optical disc pre-recording type ⑶, the optical disc brings disadvantages influences. Although the protection of the intellectual property is still unknown, the commercially available optical discs have been cut off, but due to the current (jealous) film case, and the function of limiting the number of readings, the film (clothing) film industry ’s Profits still cannot be borrowed to reflect. For a long time, the film (production) film hall II f number of people (number of rental films) is an unreasonable phenomenon. Therefore-the kind that can be restricted, 2: the existence of the industry-there is a strong demand for the world-renowned film ((production) film industry: the one-person-sized optical disc has been produced, etc. 〃Including, for example: Warner, Universal, and the actual practice can be roughly divided into harder and easier, but from the past two of the computer game corpus :: 砉 Software method Although the software program is designed to limit the number of reads, the angle is on the disc But the possibility of peeling is very high. 1227014 V. Description of the invention (2) '--- 1, the disc producers generally believe that ‘the only way to prevent this problem is to do basic defense from the disc hardware. Therefore, U.S. Patent No. 58 1 5484 first disclosed the use of a light-sensitive compound as a coating to control Guangtian 2 η 卩. This optical disc was sealed in a plastic bag before use. The transparent photoresist-like coating becomes an opaque shielding layer with light, air, or light, which reduces the reflectivity of the disc, resulting in subsequent failure to read normally. The ϊ 更 in the Guoli Li No. 6463063-further step with the corrosive inscription Reflective layer = laser; = disc life 'its main feature is behind the layer and the reaction' damage = = = = is exposed to high permeability :: Previous generation: Use airtight sealing plastic bag, and pre-seal on the back of the substrate = PC substrate. After opening the tape, use the transparent T method to let the user be outside the layer, and then Addition-Layer Bissau Exposure Can Be On Discs, Except Ming Reflection

Cu, Ag π Au, ^ J ^ noble) metals, such as: (galvanic cell), the electrolyte is added to form an electrochemical cell, and eventually it will lose its reflection ^ ~ no reflection layer becomes the anode and occurs Corrosion anti-expansion super absorbent 7 f =. Or use the volume of the disc after absorption of water to greatly increase the life of the disc. θ " Limited due to changes in the volume or shape of the disc Although the above methods are common to all these methods, the life of the optical T 5 decreases dramatically once used, the disadvantage is that the way to reduce the life of the disc is related to time, and

1227014 V. Description of the invention (3): It is related to the number of uses, so once ^ 'must be finished or used within a certain period of time, yes; = after ’use It seems unreasonable to pay the same cost. The user also needs to invent the purpose: In order to solve the above problems, the main purpose of the present invention is to limit the number of rewards or uses as a starting point = a method for making discs. The method can be ° p and the method of the invention. [Summary of the invention] Pre-recorded optical disc substrate injection molding A quarter of the metal film surface and reflection, can be made by laser light leather material. When it returns, it is one-half. The first picture shows a conventional method, which is to facilitate the use of the optical disc. In the path of the optical disc, a small concave-convex pattern with a wavelength length of -groups is formed on the controlled surface. The number of layers of the spattered surface of the light-emitting substrate is known for the transmitted light, and the inconsistent and destructive optical path difference (due to the wavelength) generated when the light is radiated at a quarter wavelength, so that the information of "0" and "" can be pre-recorded. Schematic diagram of the structure of a DVD-type DVD disc, the principle of reading, a layer of a disc reading restriction layer is set on the thunder as shown in the first figure, and the system is made. Wang Yao reads through the low drop, the diffusive layer of ten nanometers is interpreted for the present invention.

The optical disc restriction layer is mainly composed of a phase change alloy which can be induced by laser light, and the phase change alloy has an amorphous structure before the optical disc is first read. Since the amorphous structure material is optically similar to glass (a typical representative of the amorphous material), the laser light can be smooth.

1227014

The light passes through this layer and reads the reflective layer. At the same time as the light reading, the confinement layer is induced by laser light to start producing structures. The material with crystalline structure has reflective characteristics, so the "0" and "; I" signals on the laser reflective layer do not need to provide additional energy (a c ΐ i v a t i 〇 n e n e r g y) when the phase change occurs. Change ', but only at high energy density, so the life of the disc is reduced to achieve the purpose of the invention.上 之 〃 0 " Disk π 1 丨 丨 Miscellaneous .μ ^ 1 bluff. However, phase change alloys with an amorphous structure in the laser,

The phase change reaction, which changes to a crystalline material, is optically similar to a metal, and light cannot pass through this confinement layer smoothly, making it impossible to be captured. In addition, since the phase change only needs to reach the temperature above the phase change temperature, the amount of activation energy needed to overcome the reaction, so the general light does not cause the phase of laser light irradiation. The method is related to the number of uses, so

Among many known phase change alloys, the most suitable confinement layer in the present invention is a chalcogenide material. In 1969, Mr. VShljsky first discovered that chalcogens, including Se, Te, and Po, would undergo a transition between amorphous and crystalline states after exposure to f-ray light. Its I pure hoof (Te) element has the characteristics of rapid crystallization at normal temperature. Subsequent research also found that adding Ge, Sn, Sb, As or Se to tellurium can increase the crystallization temperature and change the phase change reaction rate. Therefore, by using these characteristics, the alloy composition and composition can be adjusted according to the required phase change metamorphosis temperature and reaction rate. For example, phase change alloys such as Ag ~ In-Sb-Te, In-Sb ~ Te, and Ge-Sb-Te, which are common in today's CD-RW, DVD-RAM, or DVD-RW, generally have a transformation temperature of 150 200 ◦ and <i A reaction rate of OOnsec. However, for the material of the limiting layer in this case, the above phase change alloy material

Page 12 1227014 V. Description of the invention (6) Material = directly on the substrate without any signal, with a phase-change reflective layer directly: :: = surface 3; Take the optical disc that forms the control layer and reflects closely and has a service life of more than one time. At the speed and abnormal temperature of the disc, it is equal to two-shot light power and conversion rate. It is expected that ::: = 2 = cai = change; the process of changing eyes: There are two main types of plums, one is success; :: = is medium; i is difficult to grow into a large core, but the growth rate is extremely fast), For example, Ag = 20%

Ge-Sb — Te. Because of its phase change reaction, Ke Ke is separated from the crystal: complete in time, so it is very suitable as a discarding type (make; later, and the latter is a progressive type because of its phase change, although the second # 次 -ς) first, . Some traces of crystalline secondary phase are allowed at the beginning) Laser ::, The crystalline secondary phase is generated, but each time the laser light is read, the phase f slowly grows: some 'until the area of the crystalline phase is large enough The second part of the masking is the end of the life of the disc, so it is very suitable for use as the second control layer. In order to enable those skilled in the art to make full use of the present invention, the following examples will further describe the features of the present invention in detail, but the examples are for illustration only and should not be considered as Limitation of the scope of the invention: shell

1227014 V. Description of the invention (8) &quot; In the production of targets for each furnace (alloy formula) of Houbin, powders with full particle size distribution are used instead of screening specific particle size ranges. The hot pressing of Geba material is a 250 ton hot press from American VI company. Because the target material containing zn has a low melting point, in order to avoid the loss of component volatility, after measuring the dazzling point with DgC in advance, the melting point is based on the melting point. Slightly amended process parameters at temperature: 300C 35 ° c 'Pressure: 404 members (diameter area of 2mm), time: ι hr' finishes the thickness of 6Qmnl and 645 mm bar hot pressing The density of each phase change alloy target can be as high as over 98/0. The composition is Te ·· 91% Sb: 8% Zn: 1% hypereutectic target and then a sputtering test is performed. The substrate to be plated is the most common transparent PC substrate currently used for optical discs. Although the phase change alloy target is relatively brittle and has a lower heat dissipation capability than ordinary reflective layer metal targets, it once cracked during the sputtering process, and the resistance matching was unstable and the plasma bias was unstable during sputtering. The phenomenon of beating, but it has been found that when the sputtering power is controlled at 35 to 50 kw, the vacuum is reduced to 1.5 X 10-4 torr, and the argon flow rate is controlled at 50 to 60 seem, the situation has improved significantly. Under the conditions of fixed sputtering power and argon flow rate, the thickness of the sputtering film can be directly determined by the sputtering time. These freshly sputtered discs showed a transparent pale yellow color when they were taken out of the sputtering machine, but after a few minutes, the appearance of the plating layer was totally metallic like a reflection, indicating that an amorphous transition had occurred on its own at room temperature. Crystalline reaction. According to the DSC thermal analysis curve, it is found that the main reason for this phase change alloy to generate an amorphous to crystalline reaction at room temperature is that the transformation temperature is only about 25 ° C, and the threshold of the reaction is the activation energy is too small. To. Even so ’by 〇r · Schenk

Page 16 1227014

Disc analysis of the optical disc detector, found that the signal can still be completely shielded at 65 ℃, which is commonly used in thin machines. When the information of the optical disc is over 100 ℃, the invention purpose of reading the method [Example 2] α 0 Ϊ 91% Sb: 8% Zn: 1% of hypereutectic target and its metamorphic temperature (pt / u is ρϊλΙ, the activation energy is still too low ', so another two sets of τ are also designed. ") The composition formula is Te: 74% Sb: 25% Zn: 1% and e · / G fb · 14% Zn: 2% phase-change alloys, and in the same manner as described above, a smelting smelting and Yangba and leather materials. Prior to sputtering onto a blank disc, the pm and pm phase change alloys were first thermally analyzed by DSC. The results are shown in Figures 2 and 4. From the third figure, it can be found that the transition temperature of the PTA4 phase change alloy is smoothly increased to 70. Around 〇, ΔΗ also has 73. 34 J / g. Therefore, the discs sputtered by PTA4 $ change alloy dry material not only 'the appearance of the film is transparent after completion of sputtering, but it is still transparent even after being left for a month'. This phase change alloy film (restriction layer) is subjected to [ ^ 7 Structural analysis also confirmed the amorphous structure (fifth figure (A)). However, X-ray structure analysis can be performed after irradiation with a high-energy focused laser. From the fifth figure (B), the edge can be cleared. ^ The existing peak of crystalline evil (Peak) appears on the original substrate and film. The amorphous curve shows that the phase change from amorphous to crystalline occurs. This film not only becomes totally reflective and opaque, but it is tested to be sufficient to support the laser light and achieve the signal shielding function. As for the PTA5 phase change alloy, the transformation temperature is only 37 t: the same as the original design

Page 17 1227014 Brief description of the diagram The first picture is a schematic diagram of a pre-recorded DVD disc in Nexus. The structure of the structure removed by Xia Xianshuo. The second picture is a schematic diagram of the limitable * piece of the preferred embodiment of the present invention, which is read under the laser light. The reflection layers of several optical discs are sputtered on different transparent substrates: : = Glued. Those who are in the vicinity are straight. The three pictures are the DSC thermal analysis curve of the PTA4 phase change alloy of the present invention. ^ The four figures are DSC thermal analysis curves of the PTA5 phase change alloy of the present invention. = The photo shows the [ray diffraction analysis results of the thin film (restricted layer) of the ore mined by the PTA4 phase change alloy before (A) and (B) irradiation with high-energy coke laser light). Simple description of the component representative symbols: 11 12 13 14 15 16 Laser beam Diyi transparent substrate Reflective layer Next layer Second transparent substrate Printed layer 21 22 23 24 25 Laser beam First transparent substrate Reflective layer Next layer Dier transparent substrate

Page 19 1227014 Simple illustration 26 Printed layers 27 Restricted layers

Claims (1)

1227014 6. Scope of patent application — a method to limit the number of times the optical disc is read, which is characterized in that the light beam is irradiated 5 e 6 丄 p + „Lu“ fan Erfan main reflection layer reading &quot; 〇 &quot; and "r signal In the path, set _ ^ d = the limiting layer to be taken, and this layer is mainly a phase change induced by laser light: made of gold 'transparent amorphous structure before reading the optical disc, making Lei Yier I passes through the layer smoothly and reads the signal ', 0 ,, and, 1,1,' on the reflective layer, "combined: with ΐ: Γ, the phase with an amorphous structure on the limiting layer * metal-like ⑴ is a structure, and I want GUR 7 丨 耵 田 耵 尤 揲 忒; 丨 Bailey &quot; toothed crystal 4, 4, ^ ^, ¥ Π 0 Π and &quot; 1 Π signals can not be read, so # The number of reads of the first disc is limited. Partial items are thus taken into account. 2 · If the patent application scope of the first Gan Shi, μ is combined with the phase change of the whole sheep you / ,, the restrictions on the CD-ROM read. It is made in the way that the dried material is on the surface of the optical disc substrate. 3 · As in the application of the first item of the scope of Gan * zhi, it is set on the surface of the optical disc. And method, in which the reading layer of the optical disc is restricted 4. As set out in the first item of the scope of patent application, it should be placed in front of the reflective layer. 、 / Restriction layer 5 for reading in the 8th optical disc. · As described in item 4 of the scope of patent application, they are located on different bases, /. 'Restriction layer and reflection layer in 1st-6 kinds of restricted pre-recorded light'. The two are glued. This layer is a limiting layer for the number of laser-induced thoracic filaments, and is characterized by a surface composed of alloys with a temperature between 50 ° C and 150 ° C, and the surface of which is illuminated by phase change warm light This layer can be set to accept thunder at a temperature of 7 °. For example, if the scope of patent application is equal to bit J. Restricted layer, phase change in ##