JPS5919257A - Capacity conversion type information recording disk - Google Patents

Abstract

PURPOSE:To improve both C/N and output of a reproduced signal and at the same time to obtain a visual picture excellent in quality, by using a capacity conversion type information recording disk containing a conductive coated film formed by recording the information on both sides including plural pierced holes of a conductive metallic disk in the form of a geometric hole. CONSTITUTION:For instance, eight pieces of pierced holes 11 of 5mm. diameter are provided at the outer circumference part of a recording disk together with four pieces of holes 11 provided at the inner circumference part respectively. Metallic molds 1 and 2 are adhered to each other while holding a doughnut- shaped metallic disk 12 of aluminum, etc. between, and a conductive resin liquid is pressed into a gap 15 through a resin injecting hole 14. At the same time, an absorbing hole 16 is decompressed to remove the air. This prevents the air winding and increases the molding accuracy. The resin is hardened by a heating means, etc. after the conductive resin liquid is filled completely into the gap 15. The sufficiently hardened resin is cooled, and the mold 1 is separated from the mold 2. Thus a disk 20 containing conductive resin films 17 formed on both sides of the disk 12 is produced.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a method for manufacturing a 1-conversion type information recording disk, and more specifically, a method for manufacturing a 1-conversion type information recording disk, and more specifically, a conversion type/Seiho RE2 record having excellent information recording and reproduction performance. Regarding the board.

[Technical background of the invention and its problems]

A 16-report recorder has been developed as a dC recorder for recording 8C of images (elephants, voices, etc.).In this recorder and 17, a tail-guiding powder such as carbon black is mixed with vinyl chloride resin. It is manufactured by kneading it into a thermoplastic resin and press-molding it into an f disk.The surface of the disk has multiple holes (pits) with a diameter of about 0.1 to 1 μin to store video and audio information. By touching and moving the disc surface with a reproducing needle having 1.!ffl, the spatial volume due to these uneven shapes can be read as a change in Shizuka-Kan Shun. , video r
It is used to convert and reproduce images and audio signals.

Conventionally, Kakoro video discs have been produced by making the disc surface conductive by destroying the conductive layer of metal such as aluminum using a vacuum deposition method, and then replacing this conductive layer with polystyrene or other material. coated with a dielectric layer,
The so-called coach, coated di
sc) and a thermoplastic resin composition in which a conductivity agent such as carbon plaque is added and blended in advance is press-molded,
The so-called uncoated 0 disk (uncnatie)
The 24'a type with d disc) was developed.

However, in the case of the coated disc, manufacturing
The process of destroying the conductive body layer and the g-adult layer becomes complicated;
The resulting conductive ffl coating and diluent 1 are extremely thin, and may have pinholes, or may wear out due to contact with recycled needles, resulting in peeling, breakage, etc. Therefore, in recent years, coated disks have come into widespread use because they do not require such a coating process and do not cause such inconveniences as soot, peeling of the conductor layer on the disk surface, and damage.

However, uncoated discs are thermoplastic! Since a large amount of 4-electrocarbon black is kneaded into the canned fat, the moldability is extremely poor and the bit transferability is low. Therefore, extremely advanced technology is required for material development, kneading technology, molding technology, etc., and manufacturing is difficult. In addition, the dispersibility of carbon black,
There are many problems such as the disc's heat and humidity resistance, changes in performance over time, and the internal stress of the disc, and new problems that do not exist with coated discs have arisen.

[Purpose of the invention]

This invention was devised to solve the above-mentioned drawbacks, and there is no peeling or damage of the conductor layer or dielectric layer, which is a drawback of coated disks, and there is no moldability, which is a disadvantage of uncorded disks. - The purpose is to provide a volume-discharge converting news recorder with improved transferability.

[Summary of the invention]

In other words, the present invention is a conductive metal plate having several through holes, and conductive coating in which information is recorded as a geometric representation on both sides of the through holes. The shape information recording disk is the foundation 11. The conductive coating 11 is a mixture of black fat that is liquid at room temperature or its monomer, conductive fine powder such as conductive carbon black, and a bleeding lubricant such as glycone oil. In addition, other additives are mixed in. After mixing well and dispersing uniformly, the adhesive paint is poured between the upper metal plate and the stamper. After that, it is hardened and formed).

〔Effect of the invention〕

Moreover, in a disc in which a conductive coating film is formed on the surface of a conductive metal disc, since the base is a conductive metal disc, the disc has good conductivity, and therefore, excellent image quality can be obtained.

(2) Because it is a metal base, it has excellent mechanical strength and is resistant to bending and impact.

(3) Most of the disk is made of a metal base, and the absolute loss of the conductive coating film is small, so less expensive conductive carbon black is used, so it can be manufactured at a low cost.

(4) When the paint hardens or after hardening, the lubricant grazes onto the disk surface, so an ultra-thin lubricant layer is naturally formed, resulting in good gliding properties with the recycled needle and excellent image quality. ing.

(5) Since the metal disc has multiple holes, even if paint is used without a bleeding lubricant, the adhesion between the metal disc and the paint film is excellent and the paint film bulges. There is no peeling at all.

16) Since the conductive paint is liquid in one product, the transferability is extremely poor, the moldability of the bit is good, and the image quality is good.

(Strength + 1 Since the fat matrix has a crosslinked structure, heat and humidity resistance is poor, and the disk itself and the bit do not deform.

・8) It can be manufactured using a technically easy manufacturing method.

It has the following effects.

[Invented real gun 79SJ Is there a drawing? Please refer to the detailed description of this invention.

, :g1jWhat 15 to Figure 3 is Figure '7'1 to explain the production process order of the name and name conversion information i self-recording disc (disk) according to the present invention, and Figure @4 is the result of the present invention. FIG. The molding machine is roughly divided into a mold (fl) and a mold (2), each of which has a stamper fixing jig (4) that can be removed with a screw (3).

5) and +6) are attached. First of all, these jigs 14).

5), (6) are removed from the mold (1), +21, and the stampers +7), +8 are removed as shown in Figure 2.
) to each mold, then jigs (4), ・5
) + Attach (6) and fix the stamper. At this time, by reducing the pressure inside the suction holes 19) and 11, the stamper can be more firmly attached to the gold l+1, (21
This will increase the accuracy during later casting.

Next, as shown in FIG. 3 and FIG.
~, the mold (t) and 12) are brought into close contact with each other by sandwiching a donut-shaped metal disc 02 like an aluminum disc with a hole in the center. At this time, the metal shell support protrusion 113) does not support the metal disk without any gaps around the entire circumference, but has a groove through which the resin liquid or air can freely pass.

Next, a see-through grease liquid for casting is press-fitted into the gap (151) from the grease injection hole t141.At the same time, the suction hole (1ω
The air is removed by reducing the pressure to prevent air entrainment and improve molding accuracy.

After the gap (15) is completely filled with the conductive resin liquid in this way, the cooking fat is hardened by means such as heating.

After sufficient hardening, cool and separate the molds (1) and (2).
A metal plate (12) with a conductive clear resin film (
17) obtain a disk 120 formed with:
The disc is made of a metal disc covered with a layer of paint with signal pits on the order of microns, and is donut-shaped with a hole in the center of the disc. After that, a lubricant such as /ligone oil1
1Fj; In order to naturally bleed out onto the disk surface and form a thin body squeak, the surface treatment after molding (d
It's unnecessary. In addition, since we are using a paint with a natural lubricant (C pleat out), the adhesion between the coating and the metal plate will be very weak, which can cause problems. Therefore, as in the present invention, a plurality of direct through holes (fil) are provided throughout the metal disc, and the coating material on the front and back of the disc is cast and manufactured so as to be integrated through the stacking through holes (lυ), and then coated. This strengthens the close contact between the pattern and the metal plate.

Next, an example will be described regarding a polymerization-prone resin solution using an acrylic If resin as a matrix resin.

First, 809 g of methyl methacrylate as a monomer,
In a mixture of 81 g of ethylene dimethacrylate, 0.45 g of azobisinoptiloni as heavy initiator was added.
Cool and stir well. After adding and mixing 6 g of dimethylpolysiloxane as a lubricant, 10
Conductive carbon grains were mixed in to give a concentration of ~3Qwt%, and the fraction was well mixed. As a conductive carbon blank, for example, Ketjenblack tic (manufactured by Lion ■)
or acetylene carbon are suitable. The optimal value for the carbon black content varies depending on the type and grade of carbon.In terms of h-1 formability (viscosity) and conductivity, it is best to add Ketjenblack IDC to 15 to 20 Wt4. preferable.

The conductive TA liquid is filled into a molding machine equipped with a metal plate as shown in Fig. 3, being careful not to entrap air. Next, heat the molding device to 60"C and leave it for 20 hours to polymerize by heating. At this time, if the polymerization occurs rapidly, the heat of polymerization cannot be removed, so the contents will boil and bubbles will be generated. Care must be taken.After polymerization, add 1 more
After curing for 2 hours at 20°C, the reaction is completed. This allows the remaining monomer to be incorporated as fully as possible,
This is to reduce the amount of mono (7-) remaining in the product. Products with a large amount of residual monomer tend to have a different softening temperature and are more likely to crack or chip during use.

After the reaction is completed and cooled, the molded product is removed from the mold.
Product. The initial characteristics of this product are shown in Table 1.

Comparative Example 1 Add 3 parts of tin-based stabilizer to 100 parts of 100 parts of resin
1 part, add 3 parts of ester lubricant, mix 1~, and further (C.
4. After mixing 15 wt% of the solder carbon grac with a henonyl mixer, it is kneaded with a roll. After crushing this into pellets, it is molded using a press, and the so-called An uncoated disc was prepared. Table 1 shows the characteristics of this disc.

Comparative Example 2 A conductive thermosetting acrylic paint containing dimethylpolysiloxane as a lubricant was prepared using the same composition and procedure as in the leprosy example, and this was applied to a donut-shaped metal without perforations (]υ). A disc with holes (bits) for recording information was produced by casting and hardening on both sides of the disc.The original characteristics of this disc are shown in Table 1. Disc (C) The CN ratio and output of the playback signal are both good, visually L7'1
The image quality is also excellent. Further, heat resistance, mechanical strength IW, etc. were all improved compared to the comparative example, and it can be said that the present invention is an excellent method for manufacturing a convertible information recording disc.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the mold used for making this foil, Figure 2 is a cross-sectional view when the stamper is attached to the mold, and Figure 3 is a cross-sectional view of the mold with the stamper and multiple holes, FIG. 4 is a cross-sectional view of each converted type 1 information recording disk manufactured according to the present invention, and FIG. Historically used double yen! 1. It is a diagram showing a donut cedar ring board with a cylindrical hole. ■, 2... Mold, 11... Through hole, 12... Current plate, 17... Lead-in coating 1, 18... Lubricant, 2
0...f isk. 280 Figure 1 f? Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) A plurality of through holes provided in the conductive metal plate, and information formed on both sides of the conductive metal plate including the through holes as geometric holes. A g-discharge type information recording disk formed by forming a recorded conductive coating on the surface. (2) The capacitance variable box according to claim 1, wherein the conductive coating film is a conductive coating material that contains a lubricant and is liquid at room temperature, and is formed by casting. Appearance? Recorded on. +3) * A convertible information recording disc according to item 1 of the scope of the patent, wherein the a-hole has a diameter of 01 to 5 Qam.