A method of manufacturing the substrate of the optical information medium

 

(57) Abstract:

Applications: instrumentation, in particular, an optical storage device, and can be used for the manufacture of transparent basics of optical disks with a constant signalosome, disposable and reversing entries. The invention is: to improve the reliability of data storage, disk shape fill with liquid organic material, utverjdayut material and remove the casting from the mold, and curing the liquid organic material disc shape rotate around a Central axis with a speed of from 100 to 1700 rpm

The invention relates to the making, in particular to optical storage devices, and can be used for the manufacture of transparent basics of optical disks with a constant signalosome, disposable and reversing entries.

A known method of manufacturing the substrate of the optical information medium, comprising the 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 [1] Existence is from the center to the periphery of the substrate, its tensile strength is reduced by 30%, the birefringence increases by 70.100% at high level (up to 20o). This variation of the birefringence leads to an increase in the number of errors when reading data, which reduces the reliability of its storage. In addition, the known method requires suboperations snap to ensure precision programmable control the pressure and speed of injection, which greatly complicates and increases the cost method.

The closest in technical essence and the achieved effect to the proposed solution is a method of manufacturing the substrate of the optical information medium, comprising the operations of filling liquid organic material stationary disc-shaped form containing matrix information (layout information relief), the curing of the material, removing the substrate from the mold [2]

A significant disadvantage of the prototype 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 nertney and the reversal causes a decrease in the depth of the guide grooves, the roughness and thickness of the substrate, which leads to defects of the recording layer (thickness, adhesion).

The objective of the proposed technical solution is to increase the reliability of information storage.

The reliability of information storage is determined by the amount of distortion and loss of information on an optical information carrier, for example, for video storage reliability of information is characterized by the number of depositions signal, the presence or absence of defects such as "synchronization failure", "Mary", carrier/noise, the magnitude of the roughness and thickness variation of the substrate, which leads to defects in the recording layer (thickness, adhesion).

To solve the problem in the method of manufacturing the substrate of the optical information medium by filling a liquid organic material is shaped, curing the material and extracting the casting from the mold, unlike the prototype, during curing of the liquid organic material disc shape rotate around a Central axis with a speed of from 100 to 17,000 rpm

When the rotation of the disc-shaped form with a liquid organic material around the Central the first material under the action of centrifugal forces, providing a substrate with desired characteristics.

The higher the viscosity of the liquid organic material and less than the diameter of the disc-shaped form, the faster rotating disk shape. Experiments have shown that when speeding more than 17,000 rpm are unable to obtain a substrate with the desired properties due to deterioration of study information (markup, information relief) from the Central hole (in the center) in the outflow of the liquid organic material under excessive centrifugal force.

As organic material using an optically transparent thermoplastic resins (polymethyl methacrylate, polycarbonate, polystyrene, polyvinyl chloride), fototerapia polymer composition (oligopyrroles).

The invention is illustrated in the examples.

Example 1.

Fill with liquid polymer composition on the basis of oligoadenylate glass disc shape 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, gubitosa generator in the manufacture of the grooves is 62500 Hz). 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 by irradiation with UV light. The irradiation intensity of 300 W/sq m During curing polymer compositions disc shape rotate around a Central axis with a speed of 100 rpm

Remove utverzhdennuyu casting of shaped and transferred to the drive with the requirements of the 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 respectively 0,01; 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.

Utverjdayut polymer composition by irradiation with UV light. The irradiation intensity of 300 W/m2. During curing of the polymer composition disc shape rotate around a Central axis with a speed of 17,000 rpm

Remove utverzhdennuyu casting as in example 1.

The substrate of the optical information medium is a transparent disk with a diameter of 50 mm, thickness 1.2 mm, Both sides of the disk represent a smooth surface with the size of microinhomogeneities on the surface is not more than 0.01 μm.

Applied on a substrate a recording layer thickness of 160 nm by centrifugation organic dye of spiropyran. The thickness of the recording layer is 10 nm, the adhesion does not exceed 3%

Example 3.

Fill the liquid melt of poly (mark VQ 101S company Rohm, Germany) at a temperature of 280oC-shaped metal form a working cavity with a diameter of 200 mm with a Central hole with a diameter of 35 mm and a thickness of 1.3 mm disc-Shaped form contains Nickel full color is,5-1,5 μm) with the distance between tracks is 1.6 μm. Information relief contains the encoded television program color images and stereo sound.

Utverjdayut polymethylmethacrylate cooling disc-shaped metal forms. During curing polymethylmethacrylate disc shape rotate around a Central axis with a speed of 750 rpm Under the action of decentralizing forces is compensated shrinkage curing polymethylmethacrylate, providing a substrate with desired properties.

Remove utverzhdennuyu casting of shaped.

The substrate of the optical information medium is a transparent disk with a diameter of 200 mm with a Central hole with a diameter of 35 mm and a thickness of 1.3 mm On one side of the substrate is information relief in the form of a spiral track information signs pits (recesses length of 0.5. 1.5 mm) distance between tracks is 1.6 μm. Information relief contains the encoded television program color image and supersonic.

Put information on the topography of the hardening layer thickness of 0.1 μm by magnetron sputtering of aluminum in a vacuum. Put on a reflective layer, a protective layer by rolling whatabout the second disk. Then put the adhesive layer on the protective layer by a rolling roller of hot melt glue on the basis of the best choice of rubber stamps PS-01 "Ever Grip" (Japan). Connect the drives adhesive layers, receiving the optical information carrier (videodisc).

The average number of depositions of information signals over 100 full television frame is 3.7 per frame. Defects such "synchronization failure", "moiré" no, the ratio of carrier/noise is 56 dB.

Example 4 (outside the declared value).

Fill the disc shape of the liquid polymer composition and utverjdayut composition as in example 1, but the value of the speed of rotation of the shape around the Central axis is 17050 Rev/min. Remove the casting as in example 1.

Casting is a transparent disk with a diameter of 200 mm with a Central hole with a diameter of 35 mm and a thickness of 1.3 mm On one side of the disc layout as in example 1, but the depth of the guide grooves alternating on the edge of 0.1 μm, the Central aperture of 0.06 μm.

Example 5 (in the prototype).

Fill in the pure liquid polymer composition disc shape as in example 1.

Utverjdayut liquid polymerous as in example 1. 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 with a width of 0.9 μm with a variation of 0.03 μm, a depth of 0.08 with a variance of 0.01 μm, with a pitch of 1.6 μm (range of values 0.01 µm). The size of microinhomogeneities on the disk surface, free from markings, up to 0.05 μm.

The analysis of the case studies shows that the proposed method (examples 1, 2, 3) significantly, compared with the prototype (example 5), to increase the reliability of information storage. Thus, significantly increases the compliance of the information on the matrix and on the casting: the spread width of the groove decreases to 3 times (from 0.03 to 0.01 μm), the depth of the grooves 2 times (from 0.01 to 0.005 microns), the step of groove up to 10 times (from 0.1 to 0.01 μm); the surface roughness is reduced to 5 times (from 0.05 to 0.1 μm). When speeding more than 17,000 rpm (example 4) are unable to obtain a substrate with the desired properties.

The proposed method is high. For its implementation does not require expensive precision billet, significant technological renewal process of the prototype. Valoski optical information carrier, when disc shape fill with liquid organic materials, produce curing of the material, and then the casting is pulled from the mold, characterized in that the curing process of organic material disc shape rotate around its Central axis with a constant speed from 100 to 17,000 rpm./minutes

 

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