JPS5880105A - Production of record disc having metallic luster - Google Patents

Abstract

PURPOSE:To obtain a record disc which has a sound groove excelling in durability and the metallic luster, by vapor-depositing a metal like aluminum having a large luster reflection factor on a single side of a disc of thermoplastic resin like polyester and then coating a resin film on the vapor-deposited metal. CONSTITUTION:A substrate metallic layer 24 of aluminum, etc. which has a small change of quality and a large luster reflection factor is vapor-deposited with 400-600Angstrom thickness on a single side 22 of a resin sheet 21 of a flat polyester film, etc. having 30-50mu thickness. Then transparent resin films 25 and 25' are coated on the upper surface of the layer 24 and on the surface 23 where no layer 24 of the sheet 21 is formed. A disc 2 thus obtained, a sheet 1 and a lump of transparent synthetic resin are held between press boards to be pressed and heated. Thus the resins 1 and 3' containing the upper and lower sound grooves never produce exfoliation centering on the disc 2 having the metallic luster.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for mounting a record disc having a metallic luster and emitting a shine that is welcomed by consumers.

In the past, record circles were generally black due to the material they were made of. There are many products that are colored, and even if they are colored, they do not have a metallic luster, and the present invention does not have a metallic luster. The present invention relates to a manufacturing method for producing a record disc that satisfies consumer demands by making the entire surface of the record disc have a metallic luster.

In order to achieve the above objective, the easiest thing to think of is to form a sound groove on a flat metal disc itself with metallic luster to make a record disc, but it is difficult to form such sound grooves. Even if there were a metal plate that made it possible to form sound grooves, if the metal plate was left exposed, it would be oxidized by surrounding oxygen and humidity, and its initial luster and color would be lost. In addition, it is difficult to obtain a desired color.

The next thing to think about is pasting metal foil onto cardboard, or forming sound grooves on cardboard plated with metal, but the above-mentioned pasting is done in the process of forming sound grooves. However, the metal surface has wrinkles and unevenness, which prevents it from being a beautiful metallic shiny surface, and the production yield is poor, making it unsuitable for practical use.

On the other hand, the applicant obtained patent No. 10590A8 and b
Ru. In this invention, as a method for manufacturing illustrated record discs, a substantially circular plate is placed on a flat circular transparent thermoplastic resin sheet.
Printed paper or photographs with a picture, letter, code, etc. are placed on one side of the board in concentric circles, and a block of transparent thermoplastic resin in an arbitrary shape is placed on top of that and pressed using a par press. This is a method for manufacturing a pictorial record in which sound grooves are formed on one side that is heated and cooled (Japanese Patent Laid-Open No. 55-2291
(Refer to Publication No. 8)゛. Therefore, as a result of various researches into whether it is possible to produce a record disc with a metallic luster by using a disk with a special metallic luster instead of the printed paper or photograph in the above invention, the present invention has been developed. The disk having metallic luster is obtained by depositing a highly reflective base metal layer such as aluminum on one side of a thermoplastic resin disk such as polyester having a predetermined thickness. When a record was manufactured using the above manufacturing method using a resin film coated on both sides of the desired transparent color, it was found that the sound groove itself was extremely durable and there were no wrinkles or irregularities on the reflective metal film. Moreover, the metal layer is free from discoloration and fading - a record with metallic luster has been successfully produced.

To explain in detail the embodiments of the drawings, FIG.
Press with press plate 4.5.

Indicates the state before heating or cooling is performed.

On a flat circular transparent thermoplastic resin sheet 1.

A disc 2 having metallic luster, which will be described later, according to the present invention and having substantially the same shape as this can be placed concentrically.

6 is a block made of a transparent thermoplastic resin that is made of the same material as the sheet 1 and easily fuses with the sheet 1 when heated, and its shape is selected so that the edges do not protrude from the sheet 1. The amount of resin required is slightly larger than the amount equivalent to the amount of resin constituting the sheet 1.

Place the sheet 1 on the press plate 4 of the lower stamper in a straight manner. In this case, it is desirable that the diameter of the sheet 1 be smaller than the sound groove forming portion 7 of the press plate 4 of the lower stamper.

The press plates a and b of the upper and lower stampers are schematically shown in FIGS. In this case, the sound groove forming part 7 should be slightly recessed approximately in the center of the bottom surface and should have the shape 5, as shown by the arrow 10 in Figure 1.
．． When pressed in 11 directions = press plate 4 of both stand bars
．． The sound of 5? The lll formations are mutually interpenetrating. . The sound groove forming portion 7 has a spiral female sound groove formed therein.

The sound groove non-forming part 8 in the center part is recessed slightly further than the sound groove forming part 7, and a pin 6 for forming the shaft hole of the tone disc is planted in the center thereof.

Furthermore, this is the arrow IQ on the press plates 4 and 5 of the stamper.
, when pressed in 11 directions.

A heating means for heating this and a cooling means for subsequently cooling it are provided, but these are not shown because they belong to the known art.

Next, the disk 2 with metallic luster according to the present invention will be described with reference to FIG. The base metal layer 24 is 40 OA to 60' OA with little deterioration and high gloss reflection.
Deposit to a thickness of .

Next, the upper surface of the base metal layer 24 and the resin sheet 21
After the base metal layer 23 is formed, a resin film 25, 25' of a desired transparent color is coated on the nfxLn surface 23.

In this way, the sheet 1, the disk 2 having metallic luster, and the block 3 of transparent synthetic resin are sandwiched between the press plates 4 and 5, and
Both press plates d and 5 are heated by heating means while being pressed in the direction of arrow 10.11. Then, the upper press plate 5.

The lump of transparent synthetic resin 3 in contact with this is softened by heating at high temperature, and is stretched over the flat sound groove forming part 7 to 6', and then filling the inside of the sound groove non-forming part 8, upper and lower. A sound groove is formed on the 4.5 side of the press plate and the lower part of the sheet 1, and the sheet 1 is bent and filled into the sound groove-free portion 8 as shown in FIG. Along with this, the stretched excess resin of the transparent resin mass 3'.

As shown in an enlarged view in FIG. d, it is extruded along the periphery of the upper press plate 50 and fused 12 to the periphery of the sheet 1.

As a result, there is no risk of peeling between the resin discs 1 and 3' on which the upper and lower sound grooves are formed, and the disc 2 with the metallic luster is in contact with the air around the outer periphery. There is no risk of corrosion.

Both press plates ts 5 are cooled by the cooling means, and when they are opened in the opposite direction to the arrow 10.11, the resin plate 1.3' on which the sonic sieve is formed is peeled off from the press plates 4 and 5, as shown in FIG. As shown in the cross-sectional shape, it has a shaft hole 13 in the center.

Thick wall portion 1 filled with sound groove non-forming portion 8 around this center
4, and a cross-sectional sound disc having a metallic luster on the entire surface is obtained. Such a tone disk has tone disk indication 1 on the thick wall part 14.
5"4-Cannot be inserted-C, place the press plates A and B in the condition shown in Figure 1 in advance, and insert any label 151. - Then, by performing a pressing process, the label can be integrally attached with the thick part 1 on top.

It goes without saying that the excess resin extruded around the record obtained by the above-mentioned method is cut and removed in the same manner as in the conventional method.

The record obtained in this way has a reflection color of the base metal layer,
A desired metallic luster can be obtained by mixing the color with the transparent resin film.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the apparatus for carrying out the process according to the present invention before the press operation, FIG. 2 is a cross-sectional side view of the same after the press process is completed, and FIG. 3 is a disk with metallic luster according to the present invention. FIG. 4 is an unenlarged sectional view of the edge of a record with metallic luster according to the present invention taken out from a press disk, and FIG. It is a diagram. 1... Transparent thermoplastic resin sheet, 2... Disk having metallic luster, 3... Transparent thermoplastic resin lump. 4.5... Press plate, 6... Shaft pin, 7... Sound groove forming part, 1'4... Thick wall part, 151. ,,label,
21. Resin sheet, 24...base metal layer, ? , 5.25'
...Transparent resin film. Applicant: Toyo Kasei Co., Ltd.

Claims (1)

[Claims] On one side of a flat center sheet of approximately the same shape, a metal layer is deposited on a transparent thermoplastic resin sheet having a flat circular shape, and the base metal layer is resistant to deterioration and has high gloss reflectivity. ! A disk with metallic luster coated with a resin film of a transparent color of a desired luster is placed on the top surface of the top surface and the other surface of the center sheet in a circular shape, and any transparent heat-resistant resin is placed on top of the disk. A metallic luster in which both sides of a material on which a shaped lump is placed are heated and cooled while being pressed with a press plate of a stamper having two upper and lower heating means and a cooling means with female sound grooves formed thereon. A method for manufacturing a record disc having the following.