A method of manufacturing the cd-rom

 

(57) Abstract:

The invention relates to instrumentation, optical storage devices, and in particular to methods of manufacturing information carriers such as CD-ROM. A method of manufacturing the CD-ROM includes the drying and melting of the original polymer, extrusion melt in a stationary disc-shaped mold containing matrix information, solidification of the melt during cooling, removing the casting from the CD-ROM from the mold, coating the reflective layer, the reflective coating layer with a protective varnish, UV drying varnish. Drying and transportation of the original polymer provide oil-free compressor, the casting is cooled in the mold. The deposition of the reflective layer and cooling of the casting as refrigerant use deionized water supplied to the mold and spraying device. The resistance of the water entering the mold is set in the range of 10-15 Mω, and the water temperature 11-13°C. When this protective layer is applied by centrifuging in the air. As the original polymer use polycarbonate. Pressing is carried out at precise regulation of pressure and temperature. The deposition of the reflective layer of lead in the environment and the EP, aluminum or gold or alloys of metals. The cooling circuit made of composite and is connected with the mold. This reduces the production process, increasing product quality, reliability and durability of the tool. 6 C.p. f-crystals, 1 Il.

The invention relates to instrumentation, optical storage devices, to methods for producing information carriers, in particular to a technique of fabricating a CD-ROM, and can be used for the manufacture of transparent basics of optical disks with a constant signalosome.

The invention relates also to mass production of CD-ROMs.

The term "media" means media audio and/or video and/or data carriers and other media such as CD-ROMs, and the media carrier made specifically for recording and storing audio, pictures and other information.

One of the most famous optical media these kinds is the CD-ROM, basic properties which set the standard AS 908 and specification "Compact Disc Digital Audio System Description", June 1989 , publishers Sony and Philips. The CD has, among others, the following presny focused laser beam, in the plane of a smooth base surface diameter of focus equal to the width of the track about 1 μm, within tracks one after another followed by lucabrasi cavities, so-called pita, separated from each other in the track direction and in the radial direction of the smooth areas of the surface.

A known method of manufacturing an optical information medium comprising a polymer melting, programmable injection pressure of the melt in the stationary disc shape for precision control of pressure and speed of injection, the solidification of the melt during cooling, removing the casting from the mold [Japan Patent N 59-196032, CL G 11 7/26, 1984].

A significant disadvantage of this method is the anisotropy characteristics of the substrate. So, when moving from the center to the periphery of the substrate, its tensile strength is reduced by 30%, the birefringence increases by 70%-100%. This variation of the birefringence leads to an increase in the number of errors when reading data, which reduces the reliability of its storage.

A known method of manufacturing an optical information medium, comprising the operations of filling liquid organic material fixed disco is, removing the substrate from the mold [Japan Patent N 61-74150, CL G 11 7/23, 1986].

A significant drawback of this method is the low reliability of data storage due to the reduced formemost casting media as the result of shrinkage of the curable organic material, which leads to the deviation of the substrate from the preset values. This leads to distortion and loss of information. For example, in optical media video and stereo audio (DVD) causes loss of signal, the decrease of the ratio carrier to noise, the occurrence of defects such as "moiré", "breakdown sync during playback; optical drives single and reversal causes a decrease in the depth of the guide grooves, roughness and thickness of the substrate, which leads to defects of the recording layer (thickness, adhesion).

The closest in technical essence and the achieved effect to the proposed solution is a method of manufacturing a CD-ROM, which includes operations of drying, melting, filling pressure liquid polymer stationary disc-shaped molds containing matrix information (layout information relief), the curing of the material, removing playmost and low production efficiency in mind the increased production time per unit of output, low stable quality, low reliability and durability of the means of production, low reliability storage of information due to the reduced formemost casting media as the result of shrinkage of the curable organic material, which leads to the deviation of the substrate from the specified values.

The objective of the proposed technical solution is stabilizirovannye production process, reducing production time, i.e. the increase in the number of CD-ROM per unit time, and thus reducing the cost of manufacture serial CD at the expense of precision and rapid cooling of the casting deionized (demineralized) water, elimination of sheer size, improve production efficiency, stabilizirovannye product quality, reliability and durability of the tool through the use of a refrigerant deionized (demineralized) water, with the given parameters. Reducing the cost of manufacture serial CD-ROM drive. Improving the ecology of production due to a decrease in production of harmful factors (fumes, ozone).

To solve the problem in the method of manufacturing the CD-ROM is RME, containing matrix information, solidification of the melt during cooling, removing the casting optical information carrier from the mold, coating the reflective layer, the reflective coating layer with a protective varnish, UV drying fototfreddie varnish, drying and transportation of the original polymer provide oil-free compressor, the casting is cooled in the mold, and the deposition of the reflective layer, as refrigerant use deionized water supplied to the mold and in a spraying device, a protective layer is applied by centrifuging in the air, and the water resistance at the entrance to the press asked in the range of 10-15 Mω, and the temperature of the 13oC.

As the original polymer can be used polycarbonate.

Pressing is carried out at precise pressure control. The deposition of the reflective layer are in an environment of inert gas.

As a material of the reflective layer may be used aluminum.

The method includes drying and melting of the original polymer (polycarbonate), extrusion of the melt in the stationary disc-shaped mold containing matrix information for precision regulation of the pressure, curing nechego gas (argon), coating a reflective layer, a protective layer (varnish), UV drying (fototfreddie) varnish (tanning), control, application of labels. Drying and transportation of the original polymer provide oil-free compressor, cooling as refrigerant use deionized water, a protective layer is applied by centrifuging in the air, and the water resistance at the entrance to the press asked in the range of 10-15 Mω, and the temperature of the 13oC.

A method of manufacturing the CDs are presented in the form of a structural diagram shown in the drawing, where 1 - oil-free compressor, 2 - drying unit, 3 - smelting and pressing of the original polymer in the mold, 4 - applying a reflective layer on the surface of the base CD-ROM, 5 - reflective coating layer with a protective varnish; 6 - UV drying fototfreddie varnish; 7 - control; 8 - labeling, 9 - installation of inert gas (argon), 10 - fridge, 11 - installation receiving deionized water. The cooling process is carried out by simultaneous supply deionized water to the mold and the device applied on the reflecting layer. As coolant is used deionized water, grade B (OST 11.02.9.00 is complete with water jacket, in which through appropriate fittings supplied and discharged liquid (demineralized water), creating a preset temperature. Fill under the pressure of the liquid polymer composition disc-shaped mold with the working cavity with a diameter of 130 mm with a Central hole diameter of 15 mm and a thickness of 1.2 mm disc-Shaped form contains Nickel matrix with service information (markup), made in the form of guide grooves having a width of 0.5 μm, a depth of 0.1 μm with a pitch of 1.6 μm, and the axial line is a sine wave with amplitude of 0.05 μm and an amplitude of 0.1 μm. Service information (markup) is used for monitoring (orientation) of the laser beam when recording information on the optical information carrier. The filling is produced in clean conditions of cleanliness class 100 according to OST 1114.3302-87, i.e., in 1 l of air no more than 4 particles with a maximum size of 0.5 micron.

Utverjdayut polymer composition. During curing of the polymer composition disc shape cool. As of refrigerant used deionized water with the following parameters - the temperature at the inlet to the press 13oC, the resistance of 15 Mω. Time reducing the temperature of the casting from 300oC to 40o< is in a device of applying a reflective layer in compliance with the requirements of cleanliness class 100 according to OST 1114, 3302-87.

The substrate of the optical information medium is a transparent disk with a diameter of 130 mm with a Central hole diameter of 15 mm and a thickness of 1.2 mm On one side of the disk layout in the form of guide grooves of a width of 0.8 μm, a depth of 0.1 μm with a pitch of 1.6 μm (range of values 01; 0,005; 0,01), the axial line is a sine wave with amplitude of 0.05 μm and an amplitude of 0.1 μm. The size of microinhomogeneities on the disk surface, free from markings, does not exceed 0.01 mm.

The parameters of the technological environment:

- cleanliness class 100 according to OST 1114, 3302-87.

- temperature is 21+2oC

- humidity of 50 ± 20%

The analysis of the considered example shows that the proposed method can significantly compared to the prototype, to speed up production. The proposed method performance by reducing the time for cooling the basics CD-ROM. Use deionized water with the given parameters reduces the concentration of ozone in the atmosphere of the production process, which increases the environmentally friendly way.

1. A method of manufacturing the CD, including the drying and melting of the original polymer, extrusion of Rapla is Denia, removing the casting from the CD-ROM from the mold, coating the reflective layer, the reflective coating layer with a protective varnish, UV drying varnish, characterized in that the drying and transport of the original polymer provide oil-free compressor, the casting is cooled in the mold, and the deposition of the reflective layer and cooling of the casting as refrigerant use deionized water supplied to the mold and spraying device, and the resistance of the water entering the mold is set within a 10 - 15 MW, and the temperature of the water 11 - 13oC, while the protective layer is applied by centrifuging in the air.

2. The method according to p. 1, characterized in that as starting polymer used polycarbonate.

3. The method according to p. 1, characterized in that as starting polymer used colored polycarbonate optically transparent in the wavelength of the recording and reading laser radiation.

4. The method according to p. 1, wherein the pressing is carried out at precise regulation of pressure and temperature.

5. The method according to p. 1, characterized in that the deposition of the reflective layer are in an environment of inert gas, for example argon.

6. Ways is, aluminum or gold or alloys of metals.

7. The method according to p. 1, characterized in that the cooling circuit made of composite and is connected with the mold.

 

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