CN1452162A - Disposable high-density multifunctional digital storage medium and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a disposable high-density multifunctional digital storage medium and a manufacturing method, which is applied to an optical reading storage device with a numerical aperture (NA) greater than 0.8 and a wavelength range of about 405nm. The high-density multifunctional digital storage medium comprises: a substrate; a reflective layer formed on the substrate; a dye recording layer formed on the reflective layer; an intermediate layer formed on the recording layer; and a cover layer formed on the intermediate layer. The recording layer is separated by the intermediate layer to protect the dye layer from being damaged during the manufacturing process.

Description

Disposable high-density multifunctional digital storage medium and manufacturing method thereof

technical field

The invention relates to a film layer structure of a high-density optical storage medium and a manufacturing method thereof, in particular to a film layer structure of a disposable high-density optical disc and a manufacturing method thereof.

Background technique

Since the development of compact disc CD (Compact Disc) in the early 1980s, research on the application of larger capacity and higher quality optical discs has never been interrupted. Digital Versatile Disc), using a laser light source with a wavelength of about 650nm, its data storage has grown from the previous hundreds of MB to the order of GB, such as single-sided single-layer DVD5 (4.7GB) to double-sided double-layer DVD18, its The capacity has reached 18GB, but such development is still insufficient to meet the high-capacity requirements of video multimedia, such as digital broadcasting (Digital Broadcasting) and wide-screen high-definition television (HD-TV) broadcasting and recording. Following DVD, a new generation of high-density optical discs such as high-density multifunctional digital storage media called DVR (Digital Video Recording) or HD-DVD (High Density DVD) is under development.

This new generation of high-density optical discs generally uses higher objective lens numerical aperture (NA) Numerical Aperture to above 0.8, and higher resolution 405nm wavelength laser (DVD is 650nm), in order to promote the storage capacity of the optical disc to 15GB to 50GB above to meet the needs of the application.

However, this new generation of high-density optical discs is quite different from traditional optical discs in manufacturing and production, especially when organic dyes are used as recording layers, due to the difference in the order of film formation due to the different optical disc structures, resulting in difficulty. Taking the DVR disc as an example, the thickness of its substrate has changed from 1.2mm for CD and 0.6mm for DVD to about 1.1mm for DVR, and the reading direction is different from traditional CD or DVD. The reading direction of the laser head In CD and DVD, the substrate is used as the reading surface, while the reading surface of DVR is on the opposite side of the substrate, and its thickness is only between about 0.05mm-0.2mm (that is, its thickness is generally between 50μm-200μm. 1μm = 10 ^-3 m).

Due to such differences, the order of the film layer structure added to the substrate must be reversed in order to read data correctly.

Shown in Fig. 1 is the basic film layer structure of traditional disposable optical disk, the formation of its film layer is to form a dye recording layer 12, metal reflective layer 13 and cover layer 14 sequentially respectively on the surface of substrate 11, and its reading The surface is in the direction indicated by the arrow. But for the high-density optical disk, since the laser light source of its laser pickup head (not shown) is incident by the cover layer 24 (as indicated by the arrow, its thickness is as mentioned above, only about 0.1 mm), so its The order of the film layer structure added to the substrate must also be adjusted accordingly. That is, as shown in FIG. The dye recording layer 22 is further formed with a cover layer 24 . Wherein, because the dye layer 22 is formed behind the reflective layer 23 (opposite to the traditional optical disc), it will inevitably be in direct contact with the cover layer 24, which will cause the dye layer to be damaged during the formation of the cover layer, and the quality of the disc will be affected. Influence.

The cover layer 24 generally uses a photoreactive cover glue (lacquer), and this kind of soft cover glue can be coated on the optical disc by spin coating or other suitable coating methods (such as screen printing, etc.) A covering glue layer is formed, and then cured under ultraviolet (UV) irradiation to form a covering layer 24 with high hardness. The difficulty, however, is that the cover glue tends to interact with the recording layer material, especially the record-once organic dye recording layer 22, before hardening.

Referring to Sections 3a-3b, there are two other examples of forming the covering layer in an adhesive manner. An adhesive is coated on the recording layer 22 to form an adhesive layer 31; then, a cover film layer 32 is combined with the adhesive layer 31 to form a cover layer. Alternatively, on the recording layer 22 , the cover film layer 321 with the adhesive 311 (the principle is similar to adhesive tape, and the adhesive can be a pressure-sensitive adhesive) is used as a cover layer and covers the recording layer 22 . However, both the adhesive layer 31 and the adhesive 311 in the above example have a fluid property, which is easy to interact with the dye recording layer 22 and destroy the structure of the recording layer 22, which will also cause quality problems.

Contents of the invention

In order to solve the above problems, an object of the present invention is to provide a disposable high-density multifunctional digital storage medium, which is applied to NA > 0.8, the laser reading head is generally in the blue light region, and the wavelength covers approximately 385nm-425nm optical A device that reads storage media.

Another object of the present invention is to provide a method for manufacturing a high-density multifunctional digital storage medium.

The purpose of the present invention is achieved like this:

The invention discloses a one-off high-density multifunctional digital storage medium, which comprises a base, a reflective layer, a recording layer, an interlayer and a covering layer.

The intermediate interlayer is arranged above the recording layer to prevent the cover layer from contacting the recording layer and affecting the disc quality. In addition, since the intermediate interlayer is disposed above the recording layer, when the cover layer is formed, the recording layer is protected by the intermediate interlayer and is not easily damaged, ensuring the quality of the disc.

The dye layer is arranged between the intermediate interlayer and the reflective layer, so that when the cover layer is formed, the recording layer dye is protected by the intermediate interlayer and the reflective layer without the risk of being damaged, further Ensure the stability of the dye layer and prolong the service life of the disc.

The intermediate interlayer is formed before the cover layer to prevent the cover layer from having adverse effects on the disk.

The intermediate interlayer may sputter an inorganic material on the recording layer in a sputtering manner. The material of the intermediate interlayer can be made of inorganic materials with high penetrability to blue light beams.

The invention also discloses a manufacturing method of the high-density multifunctional digital storage medium. The method includes the following steps: forming a substrate with grooves by injection molding, forming a reflective layer on the substrate by sputtering, and forming a reflective layer on the reflective layer by spin coating or vacuum evaporation. The dye layer, forming an intermediate interlayer on the dye layer by sputtering, and forming a covering layer on the intermediate interlayer by coating or pasting.

In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, an embodiment is given below, together with the accompanying drawings, for detailed description as follows:

Description of drawings

Fig. 1 is a schematic sectional view showing a structure of a known disposable optical disc;

Fig. 2 is a structural sectional view showing that another known new generation of high-density multifunctional digital storage medium has a recordable characteristic;

Fig. 3a, Fig. 3b are the illustrations that form the covering layer by known bonding method;

Fig. 4 is a structural sectional view of a disposable high-density multifunctional digital storage medium of a preferred embodiment of the present invention;

5a and 5b are cross-sectional views of the structure of a disposable high-density multifunctional digital storage medium in another preferred embodiment of the present invention.

Detailed ways

Referring to FIG. 4 , a reflective layer 23 (reflective layer) is formed on a substrate 21 by using a sputtering (sputter) device to form a reflective material such as silver or aluminum. Next, a dye recording layer 22 is formed on the reflective layer 23 by using a spin coating method (spin coating metbod), and then, an inorganic material is sputtered on the recording layer 22 by a sputtering device to form an interlayer ( intermediate layer) 41, the inorganic material can include inorganic materials such as metals, metal oxides, metal nitrides, carbon or silicon compounds, especially inorganic materials with high penetrability to blue wavelength light beams, the intermediate interlayer 41 is Formed on the recording layer to avoid contact between the covering layer and the recording layer, then, the covering material is disposed on the intermediate interlayer, and a covering layer 24 with a thickness ranging from 50 μm to 200 μm is formed by spin coating or the like .

In the present invention, because the intermediate interlayer 41 is arranged before the cover layer 24, it can effectively prevent any adverse effect between the cover layer 24 and the sensitive dye, so when the cover layer 24 is formed by spin coating, the recording layer can be kept. stability, thus ensuring the quality of high-density multifunctional digital storage media.

In addition, in the present invention, the covering layer 24 can also be formed by other methods. Please refer to 5a-5b, for example, an adhesive is coated on the intermediate interlayer 41 to form an adhesive layer 31; then, a cover film layer 32 is combined with the adhesive layer 31 to form a cover layer. Another method is to use the covering film layer 321 with the adhesive 311 as the covering layer. This kind of covering film layer is similar to an adhesive tape and can be pasted on the intermediate layer 41 to form a covering layer.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those of ordinary skill in the art may make some changes and modifications without departing from the spirit and scope of the present invention. For example, in Other film layers may also be arranged between the intermediate interlayer and the dye recording layer, or between the intermediate interlayer and the covering layer, all within the scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the claims.

Claims (20)

1. A disposable high-density multifunctional digital storage medium, characterized in that the storage medium is suitable for optical reading and storage with a numerical aperture NA greater than 0.8, and the wavelength of the laser light source is in the blue light region, and the wavelength range covers 385-425nm Media, which includes: a base; a reflective layer disposed on the substrate; a dye recording layer disposed above the reflective layer; an interlayer disposed above the recording layer; and A cover layer is arranged above the intermediate interlayer, and the thickness of the cover layer is between 50 μm and 200 μm. 2 . A disposable high-density multifunctional digital storage medium according to claim 1 , further comprising an interlayer between the dye recording layer and the cover layer. 3. The disposable high-density multifunctional digital storage medium according to claim 1 or 2, wherein the reflective layer is formed on the substrate by sputtering. 4. The disposable high-density multifunctional digital storage medium according to claim 1 or 2, wherein the dye recording layer is formed on the reflective layer by spin coating. 5. The disposable high-density multifunctional digital storage medium according to claim 1 or 2, characterized in that the intermediate interlayer is formed above the recording layer by sputtering. 6. The disposable high-density multifunctional digital storage medium according to claim 1 or 2, wherein the cover layer is formed on the middle interlayer by spin coating. 7. The disposable high-density multifunctional digital storage medium according to claim 1 or 2, further comprising an adhesive layer for combining with a cover film layer to form a cover layer. 8. The disposable high-density multifunctional digital storage medium according to claim 1 or 2, further comprising an adhesive to combine with a cover film layer to form a cover layer. 9. The disposable high-density multifunctional digital storage medium according to claim 1 or 2, characterized in that the material of the intermediate interlayer is made of an inorganic material with high penetrability to blue light beams. 10. The disposable high-density multifunctional digital storage medium as claimed in claim 1 or 2, wherein the material of the interlayer is selected from inorganic materials such as metals, metal vapors, metal nitrides, carbon or silicon compounds. Material manufacturing. 11. The disposable high-density multifunctional digital storage medium according to claim 1 or 2, wherein the laser light source is incident on the storage medium from the direction of the cover layer. 12. The disposable high-density multifunctional digital storage medium as claimed in claim 2, wherein the intermediate interlayer is directly disposed on the dye recording layer. 13. The disposable high-density multifunctional digital storage medium as claimed in claim 2, characterized in that said intermediate interlayer is directly disposed under said covering layer. 14. A method for manufacturing a disposable high-density multifunctional digital storage medium, comprising the following steps: forming a reflective layer on the substrate by sputtering; forming a dye layer on the reflective layer by spin coating; forming an interlayer on the dye layer by sputtering; and A cover layer is formed on the middle interlayer. 15. The manufacture method of disposable high-density multifunctional digital storage medium as claimed in claim 14, is characterized in that, also comprises the following steps: an adhesive on the intermediate layer; and The adhesive can form an adhesive layer, which is combined with a cover film layer by adhesive action to form a cover layer. 16. The manufacturing method of a disposable high-density multifunctional digital storage medium as claimed in claim 14, wherein the covering layer is formed on the intermediate layer by spin coating. 17. The manufacturing method of disposable high-density multifunctional digital storage medium according to claim 14, characterized in that the thickness of the covering layer is between 50 μm-200 μm. 18. The manufacturing method of disposable high-density multifunctional digital storage medium according to claim 14, characterized in that the storage medium is suitable for numerical aperture NA greater than 0.8, and the wavelength of the laser light source is in the blue light region, and the wavelength range covers 385 -425nn optical reading and storage media. 19. The disposable high-density multifunctional digital storage medium as claimed in claim 14, characterized in that the material of the intermediate interlayer is selected from inorganic materials with high penetrability to blue light beams. 20. The disposable high-density multifunctional digital storage medium as claimed in claim 14, wherein the laser light source is incident on the storage medium from the direction of the cover layer.

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