TWI240267B - Optical recordable medium - Google Patents

Abstract

An optical recordable medium at least comprises a recording layer formed on a transparent substrate. The recording layer is sequentially formed on a first transparent layer, a semi-reflective layer, a dielectric layer, a reflective layer and a material layer. When a modulated writing beam irradiates the recording layer and data is written in a recorded area, the first transparent layer and the semi-reflective layer react to form a second semi-reflective layer. When a reading light irradiates the recorded area, the light wave phase is shifted and the recorded area becomes anti-reflective.

Description

1240267 __Case No. 92106691 _____ V. Description of the Invention (1) Field of the Invention The present invention relates to the structure of an optical recordable medium (Opt i cal Recordable Media) and a recording method thereof, particularly The invention relates to an optical disc made of inorganic materials, which is suitable for optically recording data. The prior art Recordable Discs have the advantages of large storage capacity, easy storage, and low cost. They have gradually replaced the traditional magnetic storage media and become one of the indispensable storage media for modern people. The conventional recordable disc uses an organic dye to form a recordable layer. The organic dye absorbs light of a specific wavelength and changes. Therefore, data can be written by using the light of a specific wavelength. However, the α-Hydraulic layer formed with organic dyes will continuously absorb light of a specific wavelength, and slowly convert. Therefore, the life of recordable discs made of organic dyes is limited, and especially when exposed to sunlight or a light source containing light of a specific wavelength, the life of recordable discs is shortened. In addition, there are still two problems with organic dyes, that is, their applicability to high-definition data recording and high-write speed discs. When you want to increase the beta of the disc: shell material β, the groove / flat surface (Gr00ve / Land all need to be first). For organic dyes with large molecular sizes, spin coating is used.

Coat ing) method is very difficult to apply organic dyes into the grooves.

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= Case No. mmm V. Description of the invention (2) II: More data recording density also requires faster recording speed to increase. Second, for organic dyes, therefore, the stability of the materials recorded at high speeds. Getting the balance is quite difficult. Therefore, one: two, two = materials have been developed to make recordable discs as recording layers, and organic dye discs have encountered bottlenecks in increasing data recording density and speed. None, = The recording layer formed by the material is not irradiated with a beam of a specific wavelength to write data, but records the data by phase change of the inorganic material with the energy in the beam. For example, U.S. Patent Nos. 445 1 9 1 4 and 4 4 5 1 9 1 5 disclose the use of a written laser beam to form a hole in a reflective recording layer, thereby forming an anti-reflection site. Abl at ion recordable disc. Another example is U.S. Patent No. 4,499,78, which discloses a two-layer alloy method (A1 loying of Bi layer) that uses two layers of materials containing different metals to form an alloy under laser irradiation to change the reflection characteristics. Another example is the formation of a discontinuous island-shaped metal layer over the substrate disclosed in US Patent No. 5 1 88923. The part where data is not written is in an anti-reflective state. The data is written by a laser beam, which is discontinuous. The island-like metal layers are connected to form a strongly reflective metal layer. As shown in U.S. Patent Nos. 4 4 5 1 9 1 4 and 4 4 5 1 9 1 5 the recording method of a melt-loss recordable disc is to burn holes on the recording layer by laser burning. To write data. The material of the recording layer originally located at the hole position is stacked on the recording layer on both sides of the hole to form a bump. The recording layer is a reflective layer. The holes form a penetrating position. The protrusions cannot be reflected uniformly like the recording layer. There will be scattering. This will make it difficult to interpret the data.

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92106691 V. Description of the invention (3) An error occurred. U.S. Patent No. 44991 78-Way Double-Layer Alloy Method Writes-Up to 200 milliwatts to 400 milliwatts Other materials of the "", "'mention this high-energy writing mode. The formula is not applicable to the discontinuous island-like gold reed, as disclosed in US Patent No. 5 1 8 8 9 2 3 Although the reflective metal layer has a high level of processing, but there are still other problems. The disc disclosed in this patent has an anti-reflective state. After the data is written, it is converted into Strong reflection state, and the design of the first = recording disc is strongly reflective when no data is written. The second material writing system destroys its reflectivity with a light beam and produces poor Ribes as before: The advantage of the recordable disc is that it is very easy to detect that the disc is defective after the disc is completed. If there is an anti-reflection part, it indicates that the disc is defective, and I will eliminate it. U.S. Pat. The reflection of the disc is just the opposite of the conventional one. In this way, the detection of disc defects becomes quite =, This is also the reason why the recordable discs currently on the market are highly reflective when they are not written. The conventional disadvantage is that currently recordable discs made of inorganic materials cannot overcome these disadvantages at the same time. In this regard, the disclosed disc structure and recording method disclosed in the present invention overcome the above-mentioned shortcomings. SUMMARY OF THE INVENTION As the recordable discs currently made of inorganic materials cannot be overcome at the same time.

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In view of these disadvantages, the recording medium and the recording method of the present invention can be provided with a film layer design, and can achieve the disadvantages of writing a single item. The purpose of the present invention is to provide an optical type that can use common optical coating materials and the purpose of 'while not having the above-mentioned invention.' The purpose is to provide-^ Ά Jb — ^ 1 _ catching a special type of recordable media and In the recording method, the writing operation can be performed with a low-energy light beam. What this document states: The second purpose is to provide an optical recordable medium and its recording method, which can meet the current optical disc drive (CD_R or DVD_R) 2 read-write specifications and the requirements of higher density optical recording media in the future. Another object of the present invention is to provide an optical recordable medium and a recording method thereof, which have a high reflectivity, low write power, and high signal modulation.

(Signal Modulation) and has the same modulation polarity (Modulation Polarity) as the conventional disc. An optical recordable medium provided by the present invention, please refer to FIG. 丨, FIG. 1 is a diagram showing the disclosure according to the present invention. A schematic cross-sectional view of an optical recordable medium. The optical recordable medium has at least one recording layer 200. The recording layer 2000 structure is located on a transparent substrate 202, and includes a transparent layer 204, a semi-reflective layer 206, a dielectric layer 208, a reflective layer 210, and a material layer 212 in this order. Among them, the material of the transparent layer 204 may be metal, metal alloy semiconductor material, metal filler, and metal god. The material of the transparent layer 204 may be selected from the group consisting of Shi Xi, Xing, Xing Xing, Indium, Halide, Indium, Bi-Ga alloy, Bi-In alloy, and any group thereof. The thickness of the transparent layer 204 is between about 1 nm and 200 nm. The material of the semi-reflective layer 2 06 can be metal, and in particular, can be selected from

1240267 V. Description of the invention (5) i 92106691

Silver,:, gold, chromium, •, indium, iridium, Syria, crane, hair cup standing surface, chain, osmium, tin, semi-reflective layer . Material = between 100 and 100 nanometers. Reflective layer 21 °, copper, indium, iridium, nickel, inscription, chain, alloy of f, inscription, gold, and alloy, and any group and composition The group of thorium tungsten, its degree of thought is between 1 nanometer and 300 nanometers. It is a group. The thickness of the reflective layer 210 and the outer magnesium medium = 1 material are selected from the group consisting of Ci, Ming, Indium, and Tin. , Shi Xi's oxide, sulfide, and straight. Protective medium i is written with 212Γ ...- V / J is a schematic diagram showing the optically recordable cross-section of the present invention. When-writing beam 3. The irradiation recording layer 30 6 and the transparent layer 3 ° 4 will be artificially caused by the writing beam: Zhi Chengyou 'generates a semi-reflective layer 314. ♦ The reflection characteristics of the reflection layer 314's life.' An optical recordable medium provided by a displacement and reverse recording layer, ④ between m milliwatts and 30 milliwatts required for writing a light beam 1 thickness of the designed material layer 2 ^ reflectivity of the recorded layer is 0.2 065 = write modulator ^ of up 〇.6 above. _ And the carrier to noise ratio (Ratio = carrier_N〇i) can be found in more than 40dB '_ In general 6〇dB achieved.

f ~-· -............................ 1 ^ —- — · ——Case No. 921_Q_1__year 3 Ri Xiu __ V. Description of the invention (6) The principle used in the present invention is that a light beam has different transmittance (reflectivity) for different thickness material layers. When the semi-reflective layer 306 and the transparent layer 304 react due to the energy carried by the writing beam, a semi-reflective layer 314 is generated. For the reading beam, 'the reading beam is in the part where the data is not written. During irradiation, reflections are generated in the reflective layer 310, the semi-reflective layer 306, and the transparent layer 304, respectively. In the part where the data is written, reflection occurs only in the semi-reflective layer 3 and 4 and the reflective layer 3 and 0. The sum of the thickness of the semi-reflective layer 31 4 and the thickness of the dielectric layer 308 located thereunder results in a phase shift of the light wave when the reading beam is irradiated, and the reflection characteristics of the recording layer are inverted. In order to improve the heat transfer characteristics of the recording film layer and reduce the false judgment rate of the recording points, a layer of dielectric material can be plated before the transparent layer to adjust the heat transfer mode during recording. Furthermore, in order to improve the reflectivity of the recording layer, a transflective layer can be better plated in front of the transparent layer, so as to achieve the goal of improving the reflectivity of the recording layer. In addition, a transparent layer can be formed between the dielectric layer and the semi-reflective layer. This new transparent layer can also achieve the effect of improving the heat transfer characteristics of the recording film layer and reducing the false judgment rate of the recording points. The thickness of each material layer disclosed in the present invention can be adjusted as needed. The feature of the present invention is that the sum of the thickness of the reflective layer and the bit & When the light beam is irradiated, a phase shift of $ waves is generated and the reflection characteristics of the recording layer are inverted. Therefore, the ranges disclosed above are just examples. For example, the thickness f of each material layer can be adjusted to make the disc in an anti-reflective or low-reflective state when no data is recorded, and become strong after the shell material is written. Reflected state, and the power of its writing beam can be

Page 11 124026 ^ MM 92106691 V. Description of the invention (7) As low as 1 mW. The required thickness of each material layer may not be within the foregoing range, but this still belongs to the patent scope disclosed by the present invention. Embodiments In order to make the optical recordable medium and the recording method thereof provided by the present invention clearer, some preferred embodiments are provided as described below. Embodiment 1 Referring to FIG. 1, this optical recordable medium has at least one recording layer 2 0. The recording layer 200 is located on the transparent substrate 202, and its structure includes a transparent layer 204, a semi-reflective layer 206, a dielectric layer 208, a reflective layer 210, and a material layer 2 1 in order. Among them, the transparent substrate 202 is a poly (ester) substrate having a thickness of about 1.2 cm. The transparent layer 204 is a thin layer of silicon material having a thickness of about 100 nm to 100 nm. The semi-reflective layer 2 0 6 is a gold metal layer with a thickness of 7 nm to 30 nm. The dielectric layer 208 is a zinc sulfide-silicon oxide composite thin layer having a thickness of 10 nm to 150 nm. The reflective layer 210 is a thin aluminum metal layer having a thickness of about 10 nm to 100 nm. The material layer 21 2 is a protective layer. A commercially available read and write beam wavelength of 780 nanometers is used for electrical test (Dynamic Test), writing is performed at 4 times the speed, and the writing power is between 14 milliwatts and 20 milliwatts. . As a result, it was found that the reflectivity of the recording layer was between 0.2 · 2 and 0 · 65, and the maximum modulation was above 0.6. In addition, it was found in the test that the carrier-to-noise ratio of the discs described above can be within 45dB.

_ Case No. 92106691 V. Description of the invention (8) The main month day __ Only positive on Example 2

Referring to FIG. 1, this optical recordable medium has at least a recording layer 200. The recording layer 200 is located on the transparent substrate 202, and its structure includes a transparent layer 204, a semi-reflective layer 206, a dielectric layer 208, a reflective layer 21, and a material layer 2 12 in this order. The transparent substrate 202 is a polycarbonate (PC) substrate having a thickness of about 0.6 cm. The transparent layer 204 is a thin layer of a silicon material having a thickness of about 100 nm to about 100 nm. The semi-reflective layer 206 is a thin gold metal layer with a thickness of about 7 nm to 30 nm. The dielectric layer 208 is a zinc sulfide-silicon oxide composite thin layer having a thickness of about 10 nm to 150 nm. The dielectric layer 208 may also be an organic dielectric material. The reflective layer 2 10 is a thin aluminum metal layer having a thickness of about 10 nm to 100 nm. The material layer 2 1 2 is also a polycarbonate (pc) substrate having a thickness of about 0.6 cm. The electrical characteristics were tested using Pulsetech DDU- 1 0 0 0 at a speed of 1x. The read and write beam wavelength was 650 nm, and the power of the write was between 11 mW to 20 mW. As a result, it was found that the reflectance of the recording layer is between 0.2 and 0.65, and the modulation can reach a maximum of 0.6 or more. In addition, it was found in the test that the carrier-to-noise ratio of the above-mentioned discs can be more than 60 dB.

Embodiment 3 Please refer to FIG. 1 'This optical recordable medium has at least one recording layer 200. The recording layer 2 0 is located on the transparent substrate 2 2, and its structure includes

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V. Description of the invention (9) Transparent layer 204 and semi-reflective layer 206. The dielectric layer 208, the reflective layer 210, and the material layer 212. The transparent substrate 202 is a polycarbonate substrate (PC) having a thickness of about 2 cm. The transparent layer 204 is a thin layer of a material having a thickness of about 100 nm to 100 nm. The semi-reflective layer 206 is a thin gold metal layer with a thickness of about 7 nm to 30 nm. The dielectric layer 208 is a zinc sulfide-silicon oxide composite thin layer having a thickness of about 10 nm to 150 nm. The thickness of the reflective layer 210 is about 100 nm to 100 nm, and the material of the reflective layer 210 is selected from the group consisting of silver, aluminum, gold, copper, any combination thereof, and any combination thereof. Ethnic group. The material layer 2 丨 2 is a protective layer.

Electrical characteristics were tested using a commercially available read-write beam wavelength of 780 nanometers, and writing was performed at 4x speed. The writing power was between 丨 丨 milliwatts and 20 milliwatts. As a result, it was found that the reflectivity of the recording layer was between 0.2 and 0.65, and the maximum modulation was above 0.6. In addition, it was found in the test that the carrier-to-noise ratio of some of the test discs mentioned above can be above 45dB, and the highest can reach 64dB. Embodiment 4 Referring to FIG. 3, this optical recordable medium has at least one recording layer 400. The recording layer 400 is located on the transparent substrate 402, and its structure sequentially includes a dielectric layer 403, a transparent layer 404, a semi-reflective layer 406, a dielectric layer 408, a reflective layer 410, and a material layer 412. The transparent substrate 402 is a polycarbonate (PC) substrate having a thickness of about 0.6 cm. The transparent layer 404 is a thin layer of silicon material having a thickness of about 10 nm to 100 nm. The semi-reflective layer 4 0 6 is about 7 nm thick

Page 14 mpm Yuan No. 92106691 j___ Amendment V. Description of invention (10) to 30nm gold metal thin layer. The dielectric layer 408 is a sulfide-silicon oxide composite thin layer with a thickness of about 100 nm to 150 nm. The dielectric layer 408 may also be an organic dielectric material. The reflective layer 410 is a thin metal layer having a thickness of about 10 nm to 100 nm. The material layer 41 2 is also a polycarbonate (PC) substrate having a thickness of about 0.6 cm. The function of the dielectric layer 403 is to improve the heat transfer characteristics of the recording film layer to adjust the heat transfer characteristics during recording. The material of the dielectric layer 403 is the same as that of the dielectric layer 408 'but the thickness is between about 5 nm and 200 nm.

The electrical characteristics were tested by performing write at a speed of 1x with Pul setech DDU-1OO. The read and write beam wavelength was 650 nm, and the power of the write was between j j milliwatts and 20 milliwatts. As a result, it was found that the reflectance of the recording layer is between 0.2 to 0.65 and the modulation can reach a maximum of 0.6 or more. And the unit length spread rate (Jitter) of its recording points is 0.5-2% lower than that of the recording layer in Example 2. Example 5

Referring to FIG. 4, this optical recordable medium has at least one recording layer 500. The recording layer 500 is located on the transparent substrate 502, and its structure sequentially includes a semi-reflective layer 503, a transparent layer 504, a semi-reflective layer 506, a dielectric layer 508, a reflective layer 510 and a material layer 512 . The transparent substrate 502 is a polycarbonate (PC) substrate having a thickness of about 0.6 cm. The transparent layer 504 is a thin layer of silicon material having a thickness of about 100 nm to 100 nm. The semi-reflective layer 506 is a thin layer of gold metal having a thickness of about 7 nm to 30 nm. The dielectric layer 508 is a zinc sulfide-silicon oxide composite thin layer having a thickness of about 10 nm to 150 nm, and the dielectric layer 508 is also ^;

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An organic dielectric material. The reflective layer 51 0 is a thin aluminum metal layer having a thickness of about 100 nm to 100 nm. The material layer 51 2 is also a π'acid base (P C) substrate having a thickness of about 0.6 cm. The function of the semi-reflective layer 503 is to improve the reflectivity of the recording film layer to adjust the heat transfer characteristics during recording. The material of the semi-reflective layer 503 is the same as that of the semi-reflective layer 506, but the thickness is between about 5 nanometers and 100 nanometers. 'Said to use Pulsetech DDU- 1 0 0 0, write at 1x speed for electrical characteristics test' read and write beam wavelength 650 nm, write power between n milliwatts to 20 milliwatts . As a result, it was found that the reflectance of the recording layer was improved from 0.35 to 0.10 compared with the reflectance of the 5th recorded layer in Example 2 Φ, and its signal modulation could reach a maximum of 0.6 or more. Embodiment 6 Please refer to FIG. 5 'This optical recordable medium has at least one recording layer 600. The recording layer 6 0 0 is located on the transparent substrate 60 2, and its structure sequentially includes a transparent layer 604, a semi-reflective layer 606, a transparent layer 607, a dielectric layer 608, a reflective layer 6 1 0, and a material layer 6 1 2 . The transparent substrate 600 is a polycarbonate (PC) substrate having a thickness of about 0.1 cm. The transparent layer 604 is a thin layer of silicon material having a thickness of about 100 nm to 100 nm. Half The reflective layer 6 0 6 is a thin gold metal layer having a thickness of about 7 nm to 30 nm. The dielectric layer 6 0 8 is a sulfide-silicon oxide compound having a thickness of about 10 nm to 150 nm. The thin layer, the dielectric layer 608 may also be an organic dielectric material. The reflective layer 6 10 is a thin aluminum metal layer having a thickness of about 100 nm to 100 nm. The material layer 6 12 is also Polycarbonate with a thickness of about 0.6 cm

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(pc) substrate. The function of the transparent layer 6 0 7 is to improve the heat transfer characteristics of the recording film layer and adjust the heat transfer characteristics during recording. The material of the transparent layer 607 is the same as that of the transparent layer, but the thickness is between about 5 nm and 50 nm. 9 Perform writing at Pulsetech DDU-1OO, at 1x speed. ^ Electrical characteristics test, read and write beam wavelengths are 65 nm, and write power is between 7 milliwatts and 20 milliwatts. As a result, it was found that the reflectance of the recording layer was between 0 2 and 0 · 65, and the maximum modulation was more than 0 · 6. And the unit length spread rate (Jitter) of its recording points is 0.5-2% lower than that of the recording layer in Example 2. As understood by those familiar with this technology, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of patent application for the present invention; all others that have been completed without departing from the spirit disclosed by the present invention, etc. Effective changes or modifications should be included in the scope of patent application described below.

Page 17 丨 I24Q267: "ί ^ ν · · One ... People Canton.]; .... 'Qin No. 92JL0.6 ^ 91 Years _ ^ _ 0_ Correction _ Brief Description of the Schematic Figure 1 shows a diagram according to the present invention A schematic cross-sectional view of the disclosed optical recordable medium; FIG. 2 is a schematic cross-sectional view of the optical recordable media disclosed in the present invention after writing data; and FIG. 3 is a schematic cross-sectional view of the optical recordable media disclosed in Embodiment 4 of the present invention. A schematic cross-sectional view of an optical recordable medium; FIG. 4 is a schematic cross-sectional view of the optical recordable medium disclosed in Embodiment 5 of the present invention; and FIG. 5 is a schematic cross-sectional view of the optical recordable medium disclosed in Embodiment 6 of the present invention. A schematic cross-sectional view of a recording medium. Description of graphic symbols 2 0 0, 3 02, 40 0, 5 0 0, 6 0 0: Recording layer 2 0 2, 402, 5 0 2, 6 0 2: Transparent substrate 204, 304, 404, 504, 604, 607: transparent layers 2 0 6, 3 0 6, 314, 40 6, 503, 5 0 6, 6 0 6: semi-reflective layers 208, 308, 403, 408, 508, 608: dielectric layers 210, 410, 510 610: Reflective layers 212, 412, 512, 612: Material layer 3 0 0: Writing beam

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Claims (1)

1240267 _ Case No. 92106691_ 年月 日 __ VI. Application scope 1. An optical recordable medium, the optical recordable medium has at least one recording layer, the recording layer is located on a first transparent substrate, the The recording layer structure sequentially includes at least: a first transparent layer; a first semi-reflective layer; a first dielectric layer; a reflective layer; and a material layer. When a writing beam illuminates the recording layer, the first The semi-reflective layer reacts with the first transparent layer to form a second semi-reflective layer and inverts the reflective characteristics of the recording layer. 2. The optical recordable medium according to item 1 of the scope of patent application, wherein the material forming the first transparent layer is selected from the group consisting of silicon, germanium, germanium phosphide, indium phosphide, gallium arsenide, and indium arsenide , Bismuth-gallium alloy, bismuth-indium alloy, and any group and group thereof. 3. According to the optical recordable medium described in item 1 of the scope of patent application, the thickness of the first transparent layer is between about 1 nm and 200 nm. 4. The optical recordable medium according to item 1 of the scope of patent application, wherein the material forming the first semi-reflective layer is selected from the group consisting of silver, aluminum, gold, chromium, copper, indium, surface, nickel, flip, Baht, rhodium, tin, group, crane, any combination of alloys and any combination of groups. Page 19 12402 ^ 7 ^ Case No. 92106691 Amendment VI. Patent Application No. 5: The thickness of the semi-reflective layer of the optical recordable medium as described in Item No. 1 of the Patent Application No. 1 is between 5nm and 5nm. Between 100 nanometers. I. The optical recordable medium as described in item 1 of the scope of the patent application, wherein the material forming the reflective layer is selected from the group consisting of silver, Ming, gold, chromium, copper, indium, silver, silver, silver, baht, keys , Tin, group, crane, any combination of alloys and any combination of groups. 7. The optical recordable medium according to item 1 of the scope of patent application, wherein the material forming the dielectric layer is selected from the group consisting of zinc, aluminum, indium, tin, titanium, magnesium, silicon oxides, sulfides, and A group of any combination of them. 8. The optical recordable medium according to item 1 of the scope of patent application, wherein the material forming the dielectric layer further includes an organic dielectric layer. 9. The optical recordable medium according to item 1 of the scope of patent application, wherein the thickness of the dielectric layer is between about 1 nm and 300 nm. m 1 0. The optical recordable medium according to item 1 of the scope of the patent application, wherein the reflection characteristics of the recording layer are reversed due to the phase shift of the optical wave of the reading beam due to the generation of the second semi-reflective layer To. 11. The optical recordable medium according to item 1 of the scope of patent application, the material layer may be a protective layer or a second transparent substrate. Page 20 1240267 Case No. 92106 ^ 1 Amendment VI. Patent application scope 1 2 · The optical recordable medium described in item 1 of the patent application scope further includes forming a first transparent layer before forming the first transparent layer. Two dielectric layers, wherein the thickness of the second dielectric layer is between 5 nm and 200 nm. 1 3. The optical recordable medium according to item 1 of the scope of patent application, further comprising forming a third semi-reflective layer before forming the first transparent layer, wherein the thickness of the third semi-reflective layer is between 5 Nanometers to 100 nanometers. 14. The optical recordable medium according to item 1 of the scope of patent application, further comprising forming a second transparent layer before forming the first dielectric layer, wherein the thickness of the second transparent layer is between 5 nanometers Meters to 50 nanometers. Page 21