JPS6066343A - Mold for information recording disc - Google Patents

Abstract

PURPOSE:To obtain a mold having high adhering force and capable of forming long-life recording discs by roughening a non-recording area on a surface on which an irregular pattern indicating information signals is formed. CONSTITUTION:The mold for sound discs or recording discs is constituted of an area 11 on which a fine irregular pattern indicating information signals is recorded and a non-recording area 12. A part 13 of the outer periphery part and inner periphery part of the non-recording area 12 is roughened. When a plastic is molded by using such kind of a mole, the roughened area is transferred to a sound disc or a recording disc, so that the adhering force is increased at the time of adhesion or the formation of a sandwitch structure, the penetration of noxious gas or steam is prevented and highly sensitive and long-life sound discs or recording discs can be obtained.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention is based on ft? Regarding molds for recording discs, the town's detailed information is (1)) molds for forming long-lasting music discs and recording discs.

[Technical background of the invention and its problems]

With high-density recorded sound, yr and record discs can store a large amount of information, permanently or semi-permanently, and can be accessed online, making them extremely useful as storage devices. It's promising.

BACKGROUND ART Conventionally, a structure as shown in No. 11 C1 has been proposed as one of sound discs and record discs for recording information with high density. That is, a metal reflective layer 2 and a protective film 3 are formed on one side of the transparent substrate 1, and the protective layer 3'f! : Two base plates 1.1' are placed completely above and below so as to face each other, and the adhesive layer 4 is fixed between the protective layers 3 and 3' to form a close contact structure.

On the other hand, high-density recording sound disks and record disks having an air sandwich structure as shown in FIG. 2 are also well known. That is, the recording material layer 6 is formed on one side of the transparent base plate 5, and each time the recording monthly layer 6t is turned (the two substrates 5.5' are placed one above the other), the outer circumference and inner portion of the substrate 5.5' are The structure is such that the substrates 5, 5' are adhesively fixed to the periphery with an adhesive layer 8 via spacers 7, 7', and a space 9 is formed between the substrates 5, 5'.

Traditionally, rubber-based adhesives or solvent-free adhesives that do not contain reaction by-products have been used for adhesion between the protective layers 3 and 3' of the above-mentioned sound discs and recording discs, and for adhesion between the substrates 5 and 5' and the spacers 7 and 7'. However, since the ice-contacting surfaces of the substrates 1, 1' and 5.5' are sufficiently smooth, the adhesion cannot be said to be sufficient. Furthermore, in air sandwich structure sound discs and record discs, the recording material layer is usually not bonded due to the recording sensitivity of the recording material layer, and the recording material layer is not adhesively bonded (the olfactory points are 6 to 7 to shorten the retention period). ″ζ
.

[Purpose of the invention]

This invention improves the above-mentioned drawbacks of the conventional y'L,
18 The purpose of this invention is to provide a mold for completely forming sound discs and record discs with a large adhesion force and a long lifespan. It has a fine concavo-convex pattern that expresses the above-mentioned
This is because the non-recording area on the surface where the uneven pattern is formed is roughened so that the signal does not resonate completely.

The -421<force 11 of the present invention will be explained below with reference to the drawings.

FIG. 3 is a cross-sectional view of a mold for recording discs produced in collaboration with the present invention. A mold 9 is formed from an area 11 on which a fine uneven pattern representing an information signal is formed on one side 1 and a non-recording area 12, and a part 13 of the non-recording area on the outer and inner peripheries is roughened. has been done. ]41d Central hole and not essential. Due to the difference in plastic molding methods for molding discs and recording discs (1) compression molding uses a stamper metal made of Ni etc., cell casting method and photopolymerization method. In this case, a thin film provided on a glass plate is etched, a laser beam is used to bulge it, or a stand bar is held by a glass plate.

As described above, plastic molding is carried out using the mold for the sound disc and recording disc of the present invention.The roughened area of the sound disc and record disc is transferred.

When forming a close contact structure or an air sandwich structure, it has excellent adhesive strength and can prevent harmful gases and water vapor from penetrating into the gold-plated reflective layer and the H-pyrolyte layer.
As a method for roughening the non-recording area in molded discs and recording discs that can produce highly sensitive and long-life recording discs and recording discs, for example, glass molding or inorganic roughening provided on a metal substrate has been proposed. Alternatively, a MAPN-containing film can be roughened and used as a molding tool, or a glass or metal substrate can be roughened and used as a molding die. There are various methods for roughening the surface, including physical, mechanical, mechanical, electrical, etc., but there are no particular limitations.

〔Effect of the invention〕

Based on the present invention, by roughening the non-recording area of the surface on which the fine uneven pattern representing the information signal of the mold is formed, plastic-molded sound disks and recording disks can be made in close contact or with air. When forming a sandwich structure, the strong adhesive strength prevents partial peeling and prevents harmful gases and water vapor from entering the metal reflective layer and recording material layer, resulting in long-life sound discs and recording discs. It is possible to provide a molding iξ for forming. In addition, in the high-density recording sound disc and record disc of the air sandwich structure 7A, which allows additional recording, there is no need to provide an f′ protection layer on the recording material layer to prevent harmful gases and water vapor from entering the recording material layer. A molding die for forming highly sensitive sound discs and recording discs can be provided.

[Embodiments of the invention]

(Example 1) A positive 7J resist layer with a thickness of 800 angstroms was provided on a glass substrate with a thickness of 8 mm and a size of 200 mm φ by a spin cord method. After prebaking, it was exposed to argon laser and developed to form tracking grooves with a depth of 800 angstroms, a width of 0.7 microns, and a pitch of 2 microns in the recording area. On the other hand, a recording layer was formed in the non-recording area with a depth of 800 angstroms, a size of 04 microns φ, and a pitch of 2 microns. Next, an Au film having a thickness of 2500 Angstroms was provided on the resist layer in which the grooves and pits were formed. Plated for 5 hours in a plating bath containing nickel sulfamate as a main component to obtain a 300 micron thick NjPr
4 was established. A Nix tamper with a width of 300 microns was formed by peeling between the resist layer and the Ni layer. Using this stand ball, an acrylic disk with a thickness of 1.2 mm was molded by injection molding. Two acrylic disks were placed so that their grooves faced each other, and cured with epoxy adhesive through a spacer for 4 hours under 6QC to form a sound disk and a recording disk with an air sandwich structure.Meanwhile, LTK with no pit signal in the non-recording area in the same 4th/Tsuyu due to Himuko
A 2 mm thick acrylic disk is molded using the injection molding method using a 300 micron Ni stamper, and the conventional sound disk and BL with air sand winch structure are molded using the same method.
I made the L-Roku mochi into a fiF shape. In the method of the present invention and the conventional method,
(2CJAj?] 2CJAj?) The tone disks and record disks are exposed to the atmosphere of 5E, 95 quartz 1. In the case of tone disks and record disks based on the conventional method, there is a partial spacer on the outer periphery of the millimeter wide spacer. When peeling 1 ((t) was removed. After releasing both for another 10 minutes, it was found that by the conventional method, a T with a thickness of 2000^ was removed.
The reflectance of the e-layer decreased due to oxidative corrosion, and deterioration began. There was no change at all in the release in 50'C, 95% R to 1, which ranged from 30B+1 to 30B+1, for the tone and record discs used in accordance with the method of the present invention.

In order to clarify this effect, a rectangular acrylic plate with a thickness of 1.2 mm + 20 mm and a size of 100 mm was molded. A sample was prepared for measuring the shear tensile strength.The adhesive surface was prepared using the conventional method (cut and smooth, but as in the case of the Mononoke disk made using the method of the present invention, a sample with a depth of 800 angstroms and a large surface was used). Bits with a diameter of 0.4 microns φ were installed at intervals of 2 microns. 50°C, 95% R
The change in adhesive strength over time in H was 14% as shown in Table 1, and the sound/11:I and record discs based on the method of the present invention had a long life.

(Example 2) After a 70 angstrom thick Cr layer was formed as a full adhesive layer on a flat glass substrate with a thickness of 8 mm and a size of 200 mm φ, a 1000 angstrom Au layer with a thickness of 2000 angstroms was formed. The angstroms were laminated sequentially. A converged argon laser beam was irradiated to produce an omega-shaped termination with a depth of 500 angstroms and a width of 04 microns, which was taken as the tracking phase. Furthermore, a 2000 angstrom thick Au film was applied during the Ω-shaped tracking phase (L-1), and then 280 μm Ni
・Fully installed 7 pieces 5 Peeled between Au layer and Te-C layer 1 pl L
,.

After forming the Ni stamper. Tracking L on stamper
■ Roughen the non-marked ζ and k areas with sandpaper, and process this by injection molding using 4p)i-1f.
Complete collection of 2mm J5 acrylic discs it'21. Ta. 2
The two acrylic disks were arranged so that their tracking peaks were facing each other, and were adhered with an epoxy adhesive via a spacer to form a sound disk and a recording tsuba disk with an air sand winch structure. When I left it in a 50C, 95% atmosphere for 30 days, there was no change in the sound or record.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view showing a 1iiJ-Kai no Jo<1-multi record disc;
FIG. 2 is a longitudinal cross-sectional view of an air-sandwich structure optical disc and recording disc, and FIG. 3 is a cross-sectional view of a mold for information recording according to the present invention in J dimension. In the figure,],,I',5. ' is the substrate, 2 is the reflective layer,
3.3' is a protective layer, 4.8 is 1 ft of adhesive, and 6 is ζ1!
Moon 1/1 layer, 7°7' is a spacer, 9 is a gap, 11 is a distribution@J4, 12 (r↓ non-recording area, 13 is a roughened area,
14 is the center hole.

Claims (1)

[Scope of Claims] In the molding for an information record C/disc having a fine unevenness mark on one side that covers an fff information signal, the non-recording area is roughened. Molding W for information recording disc