JPH0337141Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical information recording medium called a so-called Sandermansch type optical disk or an Air Sandermansch type optical disk.

Conventionally, there are various recording materials such as silver halide photosensitive materials that perform recording using a high-energy-density light beam such as a laser. When a light beam with high energy density is irradiated, it is absorbed and the irradiated area is locally heated, causing physical changes such as melting, evaporation, or aggregation, resulting in a difference in optical density from the non-irradiated area. There are recording materials on which information is recorded. This recording material generally does not require processing such as development or fixing when forming a recorded image, does not change in normal room light, does not require darkroom operation, and can provide high-contrast images. It has the advantage that additional recording (add-on) is possible.

Generally, recording on such thermal recording materials involves converting the information to be recorded into an electrical time-series signal, and using a laser beam whose intensity is modulated according to the signal.
This can be done by scanning the recording material,
In this case, there is an advantage that recorded images can be obtained in real time.

Such a recording layer (heat mode recording layer) is generally a thin film made of a metal such as Bi, Sn, In, Te, semimetal, semiconductor, etc. by vapor deposition on a glass or plastic substrate. There is. Further, during handling or storage of these recording materials, the surface of the recording layer may be scratched or foreign matter such as dust may adhere, which may adversely affect recording and reading. In order to improve such defects, for example, as illustrated in FIG. 1, two recording plates each having a heat mode recording layer 2 are attached to a transparent substrate 1 with a spacer 3 in between so that the recording layers 2 face each other. Recording media with a similar structure have been proposed (for example, in Japanese Patent Application Laid-open No.
(Refer to Publication No. 156605). This type of recording medium is called a Sanderuch type or Air Sanderuch type optical disk, and has a space 4 sealed from the outside by a spacer 3.
This prevents scratches and foreign matter from forming on the surface of the recording layer 2.

This type of recording medium records information on the recording layer 2 by irradiating a laser beam from the side of the transparent substrate 1.
It is also reading recorded information. Note that when the recording layer 1 is provided on both substrates as shown in FIG. 1, different information can be recorded on each substrate.

However, in the case of conventional recording media of this type, the outer surface of the substrate is flat, so when handling such optical discs, placing them on a stand, etc., or stacking many recording media, it is difficult to handle them. Scratches occur on the surface of the substrate, and depending on the condition of the scratches, recording and reading by the laser beam may be adversely affected.

The present invention relates to a Sanderschich type recording medium that does not have such drawbacks, and is provided with a structure in which, on the outer surface of the base material of the above-mentioned type of recording medium, the periphery of the center and/or the periphery of the outer periphery is provided. It has a structure with protrusions.

An embodiment of the present invention shown in FIG. 2 will be described below. FIG. 2 is a sectional view showing an example of the recording medium of the present invention, which has a structure in which two recording plates each having a heat mode recording layer 2 provided on a transparent substrate 1 are bonded together via a spacer 3. , a protrusion 5 on the periphery of the center and a protrusion 6 on the periphery of the outer periphery.
are provided for each. The protrusions 5 and 6 may be continuous, that is, annular, or discontinuous, that is, they may be shaped like an annular protrusion having a notch.

Although the protrusion 6 may be provided on the substrate 1 by means such as adhesion or fusion, it is desirable to form it integrally with the substrate from the viewpoint of manufacturing. In addition, FIG. 2 shows the protrusion 6.
Although the case where is provided on both substrates is shown, it may be provided on only one substrate depending on the case.

There are no particular limitations on the thickness of the substrate, the thickness of the recording layer, the thickness of the space layer 4, etc., and the numerical ranges generally employed in this type of optical disk can be employed.

As for the size of the projection 6, it is preferable that the width is several 100 μm to several mm and the thickness (height) is several μm to several 100 μm.

Transparent plastics such as polyethylene terephthalate, polycarbonate, acrylic resin, and glass are used as materials for the substrate and the projections. As the recording material, any material used for a heat mode recording layer formed by a laser beam can be used.
For example, metals such as A, Bi, Sn, In, Si, and Sb can be provided by vapor deposition, sputtering, or the like. In addition, to increase the sensitivity of the recording layer, Ge, Cr,
A mixed layer or a laminated layer of sulfides, oxides, halides, etc. of metals such as Mn, Fe, In, Sn, etc. with the metals may also be used.

Since the present invention is constructed as described above, when operating or storing an optical information recording medium, the surface of the substrate will not be scratched, which will not adversely affect recording or reading by a laser beam, and will not damage the protrusions. An integrated structure with the substrate has advantages such as ease of manufacture.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a conventional Sanderch type optical information recording medium, and FIG. 2 is a sectional view showing an example of the optical information recording medium of the present invention. 1...Substrate, 2...Recording layer, 3...Spacer, 5, 6...Protrusion.

Claims (1)

[Scope of utility model registration request] In an optical information recording medium in which two transparent plastic or glass substrates provided with a laser heat mode recording layer are bonded together with a spacer interposed between them so that the recording layers face each other, a periphery of the center and/or an outer periphery is attached to the outer surface of the substrate. An optical information recording medium characterized in that continuous or discontinuous protrusions are formed integrally with a substrate at the periphery of the part.