JPS61216146A - Information recording carrier - Google Patents

Abstract

PURPOSE:To prevent the overflow of a rolled adhesive through the inner and outer circumferential end faces by providing a groove outside a signal recording area. CONSTITUTION:An outer circumferential groove 6 is formed outside a signal recording area. An adhesive 4 is supplied between a signal recording substance 2 and a protecting substrate 3 and then rolled. Thus the adhesive 4 is expanded toward inner and outer circumferential areas and goes into an inner circumferential groove 5 as well as the groove 6. Thus the adhesive 4 stays within these grooves and never overflows until both grooves are filled completely with the adhesive 4.

Description

[Detailed description of the invention] Industrial applications The present invention relates to audio records and video discs.

It relates to information recording carriers used for information files and the like.

2. Description of the Related Art In recent years, many information recording carriers such as video discs and information files have a bonded structure.

27. An example of the above-mentioned conventional information recording carrier will be described below with reference to the drawings.

FIG. 2 shows the structure of a conventional information recording carrier. In FIG. 2, 1 is a metal coating deposited on the signal recording portion, 2 is a signal recording substrate, 3 is a protective substrate, and 4 is an adhesive layer.

The signal recording substrate 2 and the protection substrate 3 are integrated by applying an adhesive to one of the substrates, rolling it, and then hardening it.

Problems to be Solved by the Invention However, with the above configuration, when the adhesive is rolled, the adhesive overflows from the inner and outer peripheral end surfaces, and if left as is, it may be necessary to reduce the center hole diameter or damage the substrate surface. The problem is that a mechanism is required to remove the overflowing adhesive, which is extremely difficult to manufacture.

In view of the above-mentioned problems, the present invention provides an information recording carrier having a structure in which the adhesive does not protrude even when rolled when a signal recording substrate and a protection substrate are bonded together.

Means for Solving the Problems In order to solve the above problems, the information recording carrier of the present invention has a structure in which a signal recording substrate in which a groove is provided outside the signal recording area and a protection substrate are bonded together. There is.

Function In the present invention, with the above-described configuration, the rolled adhesive enters the groove, so that it does not overflow from the inner and outer circumferential end surfaces.

Embodiment Hereinafter, an information recording carrier according to an embodiment of the present invention will be explained with reference to the drawings.

FIG. 1 shows the structure of an information recording carrier in an embodiment of the present invention. In Figure 1, 1,2°3.4 is the second
It is the same as the figure. Reference numeral 5 denotes an inner circumferential groove, which is installed inside the signal recording area. Reference numeral 6 denotes an outer circumferential groove, which is installed outside the signal recording area.

The operation of the information recording carrier configured as described above will be explained below using FIG. 1.

After supplying the adhesive between the signal recording board 2 and the protection board 3, when the adhesive is rolled, the adhesive spreads to the inner and outer peripheries, but when it reaches the inner and outer grooves 5 and 6, the adhesive spreads inside the grooves. The adhesive layer 4 remains within the range of the groove until the groove is completely filled.

As described above, according to this embodiment, by providing the grooves outside the signal recording area, it is possible to prevent the adhesive from bubbling from the inner and outer circumferential end surfaces.

In this embodiment, the bonding of the signal recording substrate 2 and the protective substrate 3 has been described, but it should be noted that the same effect can be obtained even if the signal recording substrate 2 is used instead of the protective substrate 3. not.

Effects of the Invention As described above, according to the present invention, by providing a groove outside the signal recording area, it is possible to eliminate the adhesive from flaring up from the inner and outer circumferential end surfaces, so that the center hole diameter can be reduced, The adhesive does not get around to the substrate surface and contaminate it, and there is no need for a mechanism to remove adhesive that overflows into the production equipment, making it possible to obtain a high-quality information recording carrier at a low cost.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an information recording carrier according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a conventional information recording carrier. DESCRIPTION OF SYMBOLS 1... Metal coating, 2... Signal recording board, 3... Protective substrate, 4... Adhesive layer, 5
...Inner circumference groove, 6...Outer circumference groove. Name of agent: Patent attorney Toshio Nakao and 1 other person” 5-Paper 1, Figure 2

Claims (3)

[Claims] (1) An information recording carrier comprising a signal recording substrate having a signal recording section and a groove provided outside the signal recording area, and a protection substrate bonded together. (2) The information recording carrier according to claim (1), wherein a groove is provided concentrically with the signal. (3) The information recording carrier according to claim (1) or (2), wherein a signal recording substrate is used as the protective substrate.