JPH02263342A - Information recording medium - Google Patents

Abstract

PURPOSE:To widen the area to be mounted to a turntable and to prevent the face wobbling at the time of a rotational driving as well as to obviate the peeling of an information part by recording the information part to a reinforcing plate interposed between substrates. CONSTITUTION:An optical disk is constituted of two sheets of the transparent substrates 11, 11 and the reinforcing plate 12 interposed between these substrates 11 and 11. The substrates 11, 11 and the reinforcing plate 12 are adhered by a transparent adhesive agent 13. The information part 14 where a trade name, serial number, etc., are displayed, is recorded on the reinforcing plate 12. The information part 14 is recorded on the reinforcing plate 12 in such a manner and this information part is disposed to face the transparent part of the substrates. The area to be mounted to the turn table is widened in this way regardless of the area of the information part and the peeling of the information part is obviated.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention relates to an information recording medium having a double-sided bonded structure.

(Prior Art) An information recording medium such as an optical disk as shown in FIG. 5 is known. That is, from now on, the disk will be made by bonding two substrates 1, 1 together and forming a recording layer 2 on the opposing surface.
It has a double-sided design and can be used on both sides.

Further, on the surfaces of the substrates 1, 1, as shown in FIG.
A label 3 displaying information 5 such as a product name and a serial number is attached. This label 3 is attached to area B of the recording layer 2, avoiding area A, so as not to interfere with light irradiation to the recording layer 2 of the substrate 1.1.

When the optical disc thus constructed is used, it is mounted on the turntable 4 and driven to rotate.

By the way, when the label 3 is pasted on the turntable mounting area C on the surface of the substrates 1, 1, the optical disc will be mounted on the turntable 4 via the label 3, and if it is rotated in this state. , causing surface wobbling.

Therefore, the turntable mounting area C is labeled 3 above.
It was narrowly restricted to areas that avoided the

(Problems to be Solved by the Invention) However, when the turntable mounting area C becomes narrow, the holding state of the optical disc becomes unstable, and there is also a problem that surface wobbling occurs during rotational driving.

Furthermore, since the label 3 was attached to the surfaces of the substrates 1, 1, there was a risk that the label 3 would peel off during long-term use.

Furthermore, since the two substrates 1, 1 were simply attached directly, there was a problem that as the diameter became larger (for example, 12 inches), warping and surface wobbling increased.

Therefore, this invention allows the turntable mounting area to be enlarged, the display on the information section will not become unclear even after long-term use, and even if the diameter becomes large, warping or surface wobbling will not occur. The purpose is to provide an information recording medium that is free of .

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the present invention provides a pair of substrates each having a transparent portion in part, and a reinforcing plate interposed between the pair of substrates. and an information portion recorded on the reinforcing plate and facing the transparent portions of the pair of substrates.

(Function) By recording the information part on the reinforcing plate and facing the transparent part of the board, regardless of the area of the information part,
It is possible to obtain a wide turntable mounting area, and the information section does not peel off, and by interposing a reinforcing plate between the pair of substrates, warping and surface wobbling can be prevented even when the diameter becomes large. I made sure that there was no.

(Example) The present invention will be described below with reference to an example shown in FIGS. 1 to 4.

FIG. 1 shows an optical disk as an information storage medium, and this optical disk is composed of two transparent substrates 11.11 and a reinforcing plate 12 interposed between these substrates 11.11. The substrate 11.11 and the reinforcing plate 12 are bonded together with a transparent adhesive 13.

Furthermore, as shown in FIG. 3, the reinforcing plate 13 has an information section 14 recorded thereon that displays the product name, serial number, and the like.

Further, as shown in FIG. 4, a recording layer 15 is formed on the opposing surface of the substrate 11.11.

A circular transparent portion 16 is formed in the center of the recording layer 15, and the information portion 14 recorded on the reinforcing plate 12 is opposed to the transparent portion 16. Therefore, the substrate 11
．． The contents of the information section 14 can be read through the transparent section 16 of 11.

Next, the manufacturing procedure of the above-mentioned optical disc will be explained.

First, an information portion 14 is recorded on the reinforcing plate 12 shown in FIG. 3 in a region corresponding to a mask region of the substrate 11, which will be described later. Further, after pasting a circular mask (not shown) to the center of the transparent optical disk substrate 11, the recording film 1
5 is formed into a film. After this film formation, the mask is peeled off and the transparent part 1 is
form 6.

Then, two substrates 11 formed in this manner are prepared, a transparent adhesive 13 is applied to each of the surfaces facing the recording film 15, and these substrates 11.11 are adhered to both surfaces of the reinforcing plate 12, respectively. When bonded in this manner, the information portion 14 can be read through the substrate 11.11 through the mask region (transparent portion 16) during film formation, as shown in FIG.

As described above, in order to record the information section 14 on the reinforcing plate 12 interposed between the substrates 11 and 11, the information section 14 is attached to the substrate 1.
1.11 not exposed to the surface. Therefore, the turntable mounting area C can be widened, surface wobbling during rotational driving can be prevented, and the information section 14 will not peel off as in the conventional case.

In addition, since the reinforcing plate 12 is interposed between the substrates 11 and 11, even if the diameter thereof becomes large (for example, 12 inches),
Warping and surface wobbling can be prevented.

[Effects of the Invention] As explained above, according to the present invention, since the information part is recorded on the reinforcing plate interposed between the boards, the information part is not exposed on the surface of the board, and the turntable mounting area can be expanded. I can,
It is possible to prevent surface wobbling during rotational driving, and there is no possibility that the information section will peel off, unlike in the past.

Further, since the reinforcing plate is interposed between the substrates, even if the diameter of the reinforcing plate becomes large, warping and surface wobbling can be prevented.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a front view showing an optical disk, FIG. 2 is a plan view thereof,
FIG. 3 is a plan view showing the reinforcing plate, FIG. 4 is a plan view showing the substrate, FIG. 5 is a front view showing a conventional optical disk, and FIG. 6 is a plan view showing its label. 11.11... Board, 12... Reinforcement plate, 15...
Information Department, 16...Transparent Department.

Claims (1)

[Claims] A pair of substrates each having a transparent portion in part, a reinforcing plate interposed between the pair of substrates, and an information portion recorded on the reinforcing plate and facing the transparent portion of the pair of substrates. An information recording medium characterized by: