JPH0626021U - Optical information recording carrier - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the reliability of an optical information recording medium. [Structure] At least a substrate, an organic dye-based recording layer, and
An optical information recording carrier in which a reflective layer and a protective layer are laminated, the reflective layer covers the entire surface of the organic dye-based recording layer, and the reflective layer directly contacts the substrate at the inner and outer peripheral side edges, and further the protective layer. Protects the organic dye recording layer and enhances the peel strength of the inner and outer peripheral portions by encapsulating the entire surface of the reflective layer and further forming a recording layer close contact closed structure in which the inner and outer peripheral side edge portions are in direct contact with the substrate.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an optical information record carrier on which information is recorded using a light beam.

[0002]

[Prior art]

 The optical information recording carrier is sometimes used for the purpose of long-term storage of data, and it is necessary to be able to read and write the recorded data accurately even if it is left in an environment of high temperature and high humidity. In a single-disc structure such as a compact disc, the UV-curable resin layer (hereinafter referred to as UV resin layer), which is the protective layer located at the top, covers the lower recording layer and reflective layer. That is, it is known that direct contact between the UV resin layer and the substrate at the innermost peripheral portion of the substrate is necessary for long-term storage of data.

For example, when a film is formed by vapor deposition, sputtering, etc., a disk structure as described above can be easily manufactured by providing a holder (blind) on the inner and outer peripheral portions. Also, when the organic dye layer is formed by the spin coat method, the disk structure shown in the cross-sectional view of FIG. 8 is disclosed in JP-A-2-236832 and JP-A-2-236833. It can be manufactured by.

[0004]

[Problems to be solved by the device]

 However, the organic dye layer has an unfavorable property of being dissolved in a solvent contained in the UV resin, and the organic dye layer on the substrate disclosed in JP-A-2-236832 and JP-A-2-236833. In the disk structure in which the start and end positions (film formation range) and the film formation range of the reflection layer are the same and the UV resin covers the reflection layer, the organic dye layer may be eroded by the UV resin.

According to the present invention, such an organic dye layer is not corroded by the UV resin, and the UV resin has a sufficient function as an original protective layer, and is recorded even when left in an environment of high temperature and high humidity. It is an object of the present invention to provide an optical information record carrier that can read and write data accurately.

[0006]

[Means for Solving the Problems]

 Therefore, in the present invention, at least an optical information recording carrier in which a substrate, an organic dye recording layer, a reflective layer, and a protective layer are laminated, and the reflective layer covers the entire surface of the organic dye recording layer, The reflective layer is in direct contact with the substrate at the inner and outer peripheral edges, and the protective layer covers the entire surface of the reflective layer, and the protective layer is in direct contact with the substrate at the inner and outer peripheral edges. The feature is that the recording layer is closely attached and sealed.

As a method for producing an optical information recording carrier having a structure in which an organic dye-based recording layer is tightly sealed, a dye disclosed in JP-A-2-236832 and JP-A-2-236833 is applied. After drying, wipe off with a solvent, burn off with a laser to remove it, or install a mask on the area other than the part where you want to remove the dye, and use a spin coat method to eject the solvent to remove it. Then, there is a method of removing by etching.

[0008]

[Action]

 Therefore, in the optical information recording carrier having a structure in which the organic dye-based recording layer is closely sealed as described above, peeling of the film due to permeation of water is prevented even in a high temperature and high humidity environment, and the recording pit does not deteriorate. In addition, the dye layer is prevented from being corroded when the UV resin is applied in the manufacturing process. Further, by using the manufacturing method as described above, an optical information recording carrier having a good appearance can be easily manufactured.

[0009]

【Example】

 FIG. 1 is a sectional view showing an embodiment of the present invention. That is, an organic dye recording layer 2, a gold reflecting layer 3, and a UV resin layer 4 as a protective layer were laminated on a polycarbonate substrate 1. Here, the substrate 1 is not limited to polycarbonate, and as is conventionally known, a plastic material such as PMMA, polyolefin, or epoxy, a glass plate, a metal plate such as Al, or the like can be used.

The organic dye recording layer 2 includes cyanine dyes, phthalocyanine dyes, naphthoquinone dyes, and the like. Also for the reflective layer 3, gold, silver, copper, nickel, chromium, aluminum, or an alloy thereof is used. Next, a method of manufacturing the optical information recording carrier will be shown. First, as shown in the sectional view of FIG. 2, the organic dye recording layer 2 is applied to the entire surface of the substrate 1 by spin coating. At this time, the film formation is performed so as to form an uncoated region 5, which is a non-recording region on the inner periphery side, at the film formation start position on the innermost periphery.

Next, in order to form the outer peripheral side non-recording area 6, the substrate 1 and the mask 7 are attached to a mask 7 and a spinner device as shown in FIG. 3 and a solvent such as methanol or ethanol is rotated while rotating. It is atomized and ejected to remove the dye in the outer peripheral non-recording area 6. This dye removing method may be performed by etching or the like with the same mask. Next, as shown in the cross-sectional view of FIG. 4, a holder 10 (blind) is placed on the innermost outer peripheral side non-recording areas 8 and 9 so that the reflective layer 3 entirely covers the organic dye layer 2 and the substrate 1 A film is formed by vapor deposition or sputtering so that it is in direct contact.

Subsequently, as shown in FIG. 5, the holder 10 is removed, the substrate 1 is attached to the spinner device again, and a UV resin is formed by spin coating. In this way, an optical information recording carrier is produced in which the UV resin layer 4 is in direct contact with the substrate 1 and the organic dye-based dye layer 2 is completely adhered and sealed.

A block error when a laser beam is irradiated on the optical information recording carrier according to the present embodiment, an EFM signal is recorded at a linear velocity of 1.4 m / s, and then a temperature / humidity cycle test of JIS C5024M-1 is performed. FIG. 6 shows the change in One cycle in this test corresponds to one year under normal environment. The change in block error of the optical information recording carrier having the structure in which the organic dye-based recording layer is completely adhered and hermetically produced in this example is the same as that in the conventional structure shown in FIG. 8 is extremely small as compared with the block error change shown by the alternate long and short dash line produced by the manufacturing method disclosed in Japanese Patent Application Laid-Open No. 2-236832 and Japanese Patent Application Laid-Open No. 2-236833. .

[0014]

[Effect of device]

 As described above, in the optical information recording carrier according to the present invention, the innermost peripheral portion of the substrate is in close contact with the reflective layer and the protective layer, so that the protective layer may be peeled off due to temperature, humidity, mechanical damage, or It is possible to accurately record and reproduce information over a long period of time without promoting deterioration of the dye-based recording layer.

[Brief description of drawings]

FIG. 1 is a sectional view of an optical information record carrier showing an embodiment according to the present invention.

FIG. 2 is a schematic view of a partial cross section for explaining a manufacturing process of the optical information record carrier of FIG.

FIG. 3 is a schematic view of a partial cross section for explaining a manufacturing process of the optical information record carrier of FIG.

FIG. 4 is a schematic view of a partial cross section for explaining a manufacturing process of the optical information record carrier of FIG.

5 is a schematic view of a partial cross section for explaining a manufacturing process of the optical information record carrier of FIG. 1. FIG.

FIG. 6 is a reduced view showing a change in block error.

FIG. 7 is a sectional view of an optical information record carrier having a conventional configuration.

FIG. 8 is a sectional view of an optical information record carrier showing another conventional example.

[Explanation of symbols]

 1 substrate 2 organic dye-based recording layer 3 reflective layer 4 UV resin layer 5 inner peripheral side non-recording area 6 outer peripheral side non-recording area 7 mask 8 innermost peripheral side non-recording area 9 outermost peripheral side non-recording area 10 holder

Claims (1)

[Scope of utility model registration request] 1. An optical information recording carrier in which at least a substrate, an organic dye recording layer, a reflective layer and a protective layer are laminated, the reflective layer covering the entire surface of the organic dye recording layer, The reflective layer directly contacts the substrate at the inner and outer peripheral edges,
An optical information recording carrier, wherein the protective layer covers the entire surface of the reflective layer, and the recording layer is in a hermetically sealed structure in which the protective layer is in direct contact with the substrate at inner and outer peripheral side edges.