JPH0453018B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field of the Invention> The present invention relates to an optical memory element that optically records and reproduces information.

<Technical background of the invention and its problems> In recent years, optical memory devices have attracted attention as high-density, large-capacity memory devices, and optical disk devices are particularly popular because they can shorten access time compared to magnetic tape, etc. Research and development is actively underway.

FIG. 5 shows a partially enlarged cross-sectional view of the structure of a conventionally proposed magneto-optical memory disk capable of erasing information.

In FIG. 5, 1 and 5 are transparent substrates made of glass or acrylic, respectively, and 2 and 4 are recording layers, for example, a single magnetic film or a combination of a dielectric film, a magnetic film, a reflective film, etc. It is made up of a multilayer film. Further, 3 is an adhesive layer made of ultraviolet curing resin or the like.

Such a two-layer optical memory element has the advantage of doubling the amount of information per element because information can be stored on both the front and back sides of the element. Furthermore, if resin substrates such as acrylic are used as the transparent substrates 1 and 5, there is an advantage that changes in shape such as warping of the substrates can be suppressed.

However, in this case, important issues include ensuring that the adhesive layer 3 has no uneven thickness and no variation in thickness from element to element. For example, if the optical memory element is a disk, uneven thickness causes imbalance when the element is rotated, which is not preferable.
Therefore, it is necessary to manufacture an optical memory element while strictly controlling the thickness unevenness of the adhesive layer 3.

<Object of the Invention> The present invention has been made in view of the above points, and an object of the present invention is to provide an optical memory element having a structure that eliminates uneven thickness of the adhesive layer in a two-layer optical memory element. In order to achieve this, the optical memory element of the present invention includes first and second substrates on which recording layers are formed, an adhesive layer formed by bonding the first and second substrates together, and an adhesive layer interposed between the adhesive layer. and a cloth-like member.

<Embodiments of the Invention> The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a partially enlarged cross-sectional view showing the structure of an embodiment of the optical memory element of the present invention.

In FIG. 1, 1 and 5 are transparent substrates made of glass or acrylic, respectively, and 2 and 4 are recording layers, for example, a single magnetic film or a combination of a dielectric film, a magnetic film, a reflective film, etc. It is made up of a multilayer film. Further, 6 is an adhesive layer made of a cloth-like member absorbing and containing an adhesive such as an ultraviolet curing resin, which is a feature of the present invention.

By forming the adhesive layer 6 with an adhesive layer made of a cloth-like member such as gauze impregnated with an adhesive, the thickness of the adhesive layer 6 is defined by the thickness of the cloth and becomes constant.
Further, the amount of adhesive can be reduced by replacing it with the cloth-like member.

Furthermore, it is also possible to move multiple optical memory elements while being adhered to a tape-like cloth member, which has advantages such as eliminating the need to touch the optical memory elements and contaminating the element surface. There is.

Next, a manufacturing method for manufacturing the optical memory element shown in FIG. 1, which is an embodiment of the present invention, will be described.

FIG. 2 is a diagram for explaining the method of manufacturing an optical memory element according to the present invention, in which FIG. 2A is a front view thereof, and FIG. 2B is a plan view thereof.

In FIGS. 2a and 2b, reference numeral 8 is a tape-like cloth member, and an ultraviolet curing adhesive 7 having an appropriate viscosity (for example, several hundred CPS) is dropped onto this cloth member 8 at predetermined intervals. an optical memory element element 11 which is absorbed and contained in a shaped member 8 and placed on a table 9;
11' and pressurize it from above with the presser plate 10.
When the distance (space) between the optical memory element elements 11 and 11' becomes constant, ultraviolet rays 13 are irradiated to harden the adhesive 7. Reference numeral 12 indicates a two-layered optical memory element that has already been bonded and transported.

According to the construction method described above, as shown in FIG. Adhesive 7 overflowed
Excess adhesive can be easily removed since there is no dripping. Note that 14 indicates a light passage section.

The present invention is characterized in that a cloth-like member absorbing and containing an adhesive is interposed within the adhesive layer of the optical memory element, and various modifications can be made within the scope of this invention.

For example, the cloth-like member 8 may be either a gauze-like woven fabric or a non-woven fabric made of natural fibers such as cotton, linen, or silk or synthetic fibers such as rayon, acetate, nylon, or polyester, or it may be a lattice-like material. .

The thickness of the cloth varies depending on the type of optical memory element, but in the case of an optical memory disk, it is usually about 50 to 500 μm. Further, the width of the cloth-like member 8 is preferably larger than the size of the optical memory element 11 as shown in FIG. 2b, but it is not necessarily limited to this.
Even if it is narrower than the size of the spacer, it may be used as long as it can function as a spacer.

The material of the cloth-like member 8 is not particularly limited, but if a transparent material with a refractive index of about 1.4 to 1.6 is used, the cloth-like member will not be observed from the outside with respect to the completed optical memory disk, and the appearance will be reduced. Get better.

When an ultraviolet curable adhesive is used on the end face of the optical memory element, it is preferable to provide a part through which light passes, as shown by reference numeral 14 in FIG.

It is further advantageous to use an ultraviolet curable or anaerobic curable adhesive as the uncured portion will harden over time.

<Effects of the Invention> As described above, according to the present invention, it is possible to obtain an optical memory element having a structure in which double-sided optical memory elements can be easily bonded and the thickness of the adhesive layer can be formed uniformly. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a partially enlarged cross-sectional view showing the structure of an optical memory device according to an embodiment of the present invention, FIG. 2 is a schematic diagram showing an example of a method for manufacturing an optical memory device according to the present invention, and FIG. Front view, figure b is its plan view,
FIG. 3 is a diagram for explaining the effect of the manufacturing method shown in FIG. 2, FIG. 4 is a diagram showing another example of the manufacturing method of the optical memory element of the present invention, and FIG. 5 is a diagram showing the structure of a conventional example. It is a diagram. 1... First transparent substrate, 2 and 4... Recording layer,
5... Second transparent substrate, 6... Adhesive layer, 7... Adhesive, 8... Cloth-like member.

Claims (1)

[Claims] 1: first and second substrates on which recording layers are formed; an adhesive layer formed by bonding the recording layers of the first and second substrates together; and an adhesive layer interposed between the adhesive layer. What is claimed is: 1. An optical memory element comprising: a cloth-like member; 2. The optical memory device according to claim 1, wherein the adhesive layer is made of an ultraviolet curable adhesive. 3. The optical memory element according to claim 1, wherein a cloth-like member absorbing and containing an uncured adhesive is used as the cloth-like member.