TWI400704B - Method of improving read stability of optical recording medium and optical recording medium manufactured using the method - Google Patents

Description

Method for improving stability of read/write signals of optical recording medium and optical recording medium manufactured by the method

The invention relates to a method for improving the stability of the read/write signal of an optical recording medium, in particular to improving the optical recording medium reading by adjusting the thickness of the recording layer and controlling the ratio of the writing power without significantly changing the structure of the film layer and the writing strategy. A method of writing signal stability and an optical recording medium manufactured by the method.

Optical information storage uses laser light technology to record data in an optical recording medium. The principle is to use the focused laser light to change the structure of the optical recording layer material, so that the reflectivity is significantly different due to structural differences during reading. This is used as a record and read of the 0 and 1 signals. The types of optical recording media include a read-only optical disc, a writable optical disc, and an rewritable optical disc, wherein the rewritable optical disc is formed by using a phase change recording layer material to generate a crystalline phase or an amorphous phase under irradiation of different intensity laser light. The structure realizes the function of repeated reading and writing of data by reversible phase transition between the crystalline phase and the amorphous phase.

For the signal storage method of the phase change optical disc, the recording mark is written by using a higher power short pulse laser (the power of the short pulse laser is the write power Pw) to illuminate the record of the optical disc. In the layer, the temperature of the irradiated area rises rapidly above the melting point of the material. At this time, due to the heat dissipation design of the film layer and the rapid rotation of the disk, the melting region is rapidly cooled, so that the atoms in the region do not have time to move to the stable lattice position. Further, an amorphous phase having a low reflectance is formed, where the optical properties of the amorphous region and the surrounding crystalline region are different, resulting in a contrast ratio.

The wiping of the recording mark is performed by using a slightly low-power long-pulse laser (the power of the long-pulse laser is the erasing power Pe) to illuminate the area of the recording mark, and the temperature of this area will be heated to above the crystallization temperature. Below the melting point, due to the long laser pulse irradiation, the atom has sufficient time and energy to move to a more stable state, and this region will form a crystal phase with a higher reflectance, which is the action of deleting the record. If the crystal phase with a higher reflectance represents "0", and the amorphous phase with a lower reflectance represents "1", the digital data of 0 and 1 can be recorded on the disc.

When reading data, the recording layer of the optical disc is irradiated with a lower reading power. Since the reflectivity of the crystalline/amorphous phase is different, a weak laser power can be used to detect the change of the reflected light. The recorded digital data can be read.

Therefore, when the laser light is irradiated on the recording layer, the different writing power Pw, the erasing power Pe and the substrate power Pb are modulated and the irradiation time is formed, so that a new recording mark can be formed on the recording layer and simultaneously eliminated. The old record mark, to achieve direct overwrite (directover-write) function.

The quality of the recorded mark can be evaluated by the jitter value. When the laser illuminates the recording mark on the recording layer, the digital data of 0 and 1 is formed because the reflectance of the area between the recorded mark and the area where the mark is not recorded is significantly different. If the boundary time between the front end and the back end portion (changed from 1 to 0 and from 0 to 1) is detected and set as the edge signal, the time deviation of the edge signal from the clock T of the reproduced signal is the jitter value. . In the example of BD-RE, the 1x speed recording linear velocity is 4.92 m/s, and the reference clock T is 15.15 nanoseconds.

Based on the recording mechanism of the phase-change optical recording medium, in order to enable high-speed recording, the recording layer material must have a high crystallization rate, so that the old signal can be completely erased under high-speed conditions, achieving high-speed direct Overwrite. The crystallization rate is related to the nature of the recording layer material. However, if a recording layer material having a high crystallization rate is selected in order to increase the recording speed, it is easy to cause the recording mark to gradually deform over time when the recording medium is stored for a long time in a high temperature environment, or even The disappearance, or the change in the crystalline form of the non-recorded mark, causes the overwrite characteristics to deteriorate. At this time, it is necessary to control the heat dissipation problem caused by the laser irradiation on the optical recording medium from the adjustment of the recording layer structure and the writing strategy, that is, on the one hand, sufficient laser energy must be irradiated on the recording medium to produce a smooth reading. On the one hand, the heat generated by the laser irradiation recording layer must be quickly discharged to avoid excessive heat accumulation and cause the recording layer material to deteriorate again. In addition, if the recording layer material has a high crystallization rate, when the recording layer is melted and the cooling of the recording layer is not rapidly cooled to form a sufficiently long mark, it is difficult to control the recording mark to a specific length, and thus the shorter reference time is required. The less the recording mark of the pulse length T will be formed correctly.

Different recording layer materials have different degrees of difficulty in forming amorphous phase, and the crystallization rate is also different. Therefore, when a specific recording layer material is applied, there is an optimum recording line speed and a range of applied laser power. Generally, the recording line When the speed is increased, in order to form the recording mark in a shorter time, it is necessary to take a higher energy write power, so as the recording line speed increases, the write power and the erase power tend to increase, so the write power The magnitude and ratio of the erased power have a significant impact on the ability to form a perfect record mark.

The invention patent of the Republic of China Patent No. I289723 discloses a method for controlling the illumination power by adjusting the peak power, the bottom power and the erasing power in the application of the phase change recording medium, and changing the ratio of the erasing power to the peak power, etc. The parameters are used to find the most suitable method for recording the line speed, and the ratio of the recording power to the erase power is changed by a specific interval to achieve a consistently good recording method from the inner ring to the outer ring. However, the above patent does not mention its influence on data reading stability. Sometimes the recording medium has good recording characteristics (for example, low jitter value) even when the signal is written for the first time, but the disc film structure If the recording parameters are not properly designed, the disc is easily accumulated in the recording layer due to repeated reading of the data, causing the recording mark to change, further causing the recorded data to be lost. Therefore, an object of the present invention is to provide an optical recording method which can control the appropriate write power and erase power by utilizing the relationship between the disc absorption rate and the film structure, and improve the data by using the combination of the write power and the erase power. The method of reading stability. How to appropriately increase the thickness of the recording layer and reduce the ratio of erasing power and writing power to improve data reading stability is the main solution of the present invention.

The present invention provides a method for improving the stability of the read/write signal of an optical recording medium and an optical recording medium manufactured by the method, which adjusts the light absorption rate of the recording medium by changing the thickness of the recording layer of the optical recording medium, and is preset at a specific At the light absorption rate, at least one of the ratio of the erase power to the write power (Pe/Pw), the write power (Pw), and the erase power (Pe) is set to a variable value. Under the premise that the jitter value of the initial write signal is not greatly changed, the ratio of the erase power to the write power is gradually decreased at the corresponding absorption rate, or the absorption rate of the recording medium (excluding the reflective layer) is gradually increased, and then gradually decreased. The optical recording method of erasing the read/write stability of the recorded signal by erasing the ratio of the power to the write power and whether the jitter value deteriorates sharply after one million consecutive signal readings.

The recording method of the writable optical recording medium provided by the invention can read and write data by using the laser light incident on the substrate side, and if the film structure is adjusted, the laser light incident on the opposite side of the substrate can also be used for reading and writing data. . The film layer plated on the substrate includes a reflective layer, a recording layer, a protective layer, and a light penetrating layer. As shown in FIG. 1, a representation of a film structure is constructed on a substrate, a first protective layer over the substrate, a recording layer over the first protective layer, and a second over the recording layer. a protective layer, a second interface layer over the second protective layer, a reflective layer over the second interface layer, and a top light transmissive layer. The optical recording medium of this structure can be irradiated with laser light projected on the substrate side to perform reading and writing of data.

The optical recording medium to which the present invention is applied has a substrate, and the film layer plated on the substrate includes at least a reflective layer, a recording layer, a protective layer, and a light transmissive layer. The material can be read and written by using the laser light incident on the substrate side. If the film structure is adjusted, the laser light incident on the opposite side of the substrate can be used for reading and writing data. 1 is a representation of a film structure constructed on a substrate, a reflective layer over the substrate, a first interface layer over the reflective layer, a first protective layer over the first interface layer, a recording layer over the first protective layer, a second protective layer over the recording layer, a second interface layer over the second protective layer, and a light transmissive layer of the uppermost layer. The optical recording medium of this structure can be irradiated with laser light projected on the opposite side of the substrate to read and write data.

As shown in FIG. 1 , a sectional view of a film structure of one embodiment of the optical recording medium of the present invention, the optical recording medium according to the embodiment includes a substrate (1), a reflective layer (2), and a first interface layer. (3) a first protective layer (4), a recording layer (5), a second protective layer (6), a second interface layer (7) and a light penetrating layer (8). The substrate (1) is provided with an optically transparent material and can provide appropriate mechanical strength of the recording medium, and the material includes a polycarbonate resin, a polymethyl methacrylate, and a polystyrene resin. ), polyethylene resin, polypropylene resin, etc., the substrate is pre-etched with grooves and land, when the data is recorded or read, these grooves (grooves) And land can be used as a laser beam guide and data recording position.

The first interface layer (3) and the second interface layer (7) are selected from metal nitrides such as tantalum nitride (Si ₃ N ₄ ), germanium nitride (GeN), titanium nitride (TiN), tantalum pentoxide. (Nb ₂ O ₅ ), bismuth oxynitride (Si-ON), or metal oxides such as cerium oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), and titanium dioxide (TiO ₂ ). The thickness of the first interface layer (3) and the second interface layer (7) are respectively between 0 nm and 50 nm.

The first protective layer (4) and the second protective layer (6) are selected from metal oxide or nitride materials, such as zinc sulfide cerium oxide (ZnS-SiO ₂ ), tantalum nitride (SiN or Si ₃ N ₄ ), Cerium nitride (GeN), tantalum carbide (SiC), cerium oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), titanium dioxide (TiO ₂ ). The first protective layer (4) and the second protective layer (6) may be one of the above dielectric materials, or may be composed of two or more of the above dielectric materials, and the respective thicknesses are between 1 nm and 200 nm. between. The reflective layer (2) is an alloy of silver (Ag), gold (Au), aluminum (Al), molybdenum (Mo), tantalum (Ta), titanium (Ti) and the above elements, and has a thickness of 5 nm to 300 nm. between.

The recording layer (5) is a phase change material having a high crystallization rate, and the composition of the recording layer material can be adjusted according to the use requirements of different recording line speeds. The ideal composition contains at least germanium (Ge), tin (Sn), and germanium. One of (Sb), tellurium (Te), gallium (Ga), and indium (In) elements, and the specific application composition is Ge-In-Sb-Te, Ge-Sb-Sn, In-Sb-Te, Ag-In -Sb-Te, Ge-In-Sb-Sn, Ga-In-Sb-Te, Ga-In-Sb-Sn, and the like. In the application of BD2 speed, the preferred recording layer material and composition range is: 0 < Ge < 10, 0 < In < 10, 50 < Sb < 70, 20 < Te < 30 (atomic percent). The thickness of the recording layer (5) is between 3 nm and 30 nm. The light penetrating layer (8) is a photohardening resin for protecting the film layer stability of the optical recording medium, and avoiding the film material being subjected to abrasion, moisture deterioration or exposure to oxidation in the air.

The method for improving the reading stability of the recordable optical recording medium of the invention can improve the stability of the storage of the optical disc data, so that the recorded signal does not cause the signal strength to weaken or disappear due to repeated readings, and can be long-term. Save the stored data.

For a better understanding of the features and technical aspects of the present invention, reference should be made to the accompanying drawings.

Embodiment 1:

A blue-ray disc-relay (1) having a groove and a land at a moment with a gauge of 74 μm and a thickness of 1.1 mm was prepared. A layer of 100 nm thick silver (Ag) is deposited on the substrate (1) by magnetron sputtering on the reflective layer (2), and then 8 nm thick tantalum nitride (SiN) is deposited on the reflective layer (2). a first interface layer (3), and then a thickness of 8 nm of zinc sulfide-yttria (ZnS-SiO ₂ ) is deposited on the first interface layer (3) on the first protective layer (4), and then first protection a recording layer (5) having a thickness of 11 nm is formed on the layer (4), and a zinc oxide-yttria (ZnS-SiO ₂ ) having a thickness of 19 nm is plated on the recording layer (5) on the second protective layer (6), and On the second protective layer (6), 30 nm thick tantalum nitride (SiN) is plated on the second interface layer (7), and the structure of the film layer is as shown in Fig. 1. Finally, a light transmission film having a thickness of 0.1 mm was spin-plated on the protective layer as a light transmitting layer (8), and the disc of the experimental example 1 was completed.

The thickness of the sputtered film was observed by atomic force microscopy (AFM) and Eta Optik; the dynamic analysis of the disc was measured using the PULSTEC ODU-1000 dynamic tester to measure the dynamic properties of the disc. The measured write power is between 5.5mW and 5.9mW, the read power is 0.35mW, the laser wavelength is λ=405nm, the numerical aperture mirror is NA=0.85, and the write line speed is 4.92m/s and 9.84m/ respectively. s, in line with the Blu-ray Disc Recording Disc (Blue-ray Disc-RE) 1x speed and 2x speed recording speed specifications.

When the laser writes the signal, the recording layer is heated by the laser light pulse and the temperature rises. When the writing power is too small, the temperature of the recording layer (5) is too low, and the reflectance of the film cannot be changed, so that the measurement cannot be measured. The jitter value and the modulation value; conversely, when the write power is too large, the jitter value increases as the write power increases, possibly because the laser power is too high, so that the temperature of the recording layer (5) is too high. The distortion of the disc film structure is caused, so that the jitter value is increased, so that the writing power of the optical disc generally has an appropriate range.

Fig. 2 is a dynamic test result after the disc of the first embodiment has a write power of 4.80 mW to 6.33 mW and a write power ratio (Pe/Pw) of 0.65, respectively, and is continuously overwritten 10 times. It can be seen from the results that the lowest jitter value can be obtained when the write power is 5.5 mW (the recording mark front-end jitter value is 5.39; the recording mark back-end jitter value is 6.24), indicating that 5.5 mW is the better write power. When the write power is greater than or less than 5.5 mW, the jitter value will gradually increase. When the write power deviates from the optimal write power by ±10%, the jitter value remains below 7.0, which is in accordance with the specifications of the Blu-ray recordable disc.

Although the disc of the first embodiment has a low jitter value after 10 consecutive overwrites, the stability of the data after long-term reading is further detected. As a result, as shown in FIG. 3, the disc of the first embodiment is The write power is 5.5mW and the erase power is 3.6mW (the difference between the write power and the erase power is Pw-Pe=1.9). After writing the recording signal with the length of 2 to 8 times the reference clock T, The dynamic test result of the number of signal readings and the jitter value of the jitter is shown in the result of Fig. 3. When the recording medium performs the first recording signal, the marker front end (jitter-L) and the back end (jitter) are recorded. The jitter values of -T) are 5.39 and 6.24, respectively. However, after reading the signal continuously at a reading power of 0.35 mW at room temperature, the jitter value of the disc gradually increases as the number of readings increases. When the signal is read continuously for 760000 times, the jitter values of the jitter front end (jitter-L) and the back end (jitter-T) rise to 7.06 and 7.43, respectively, and the display recording mark deteriorates significantly after repeated low-power reading. The signal that caused the recording cannot be stored stably for a long time.

In order to improve the deterioration of the recording signal, by using the method of the present invention, the absorption rate of the recording medium to the recording laser wavelength is controlled by adjusting the thickness of the recording layer (5), and when the thickness of the recording layer (5) is increased, the writing is improved. The difference between the power and the erase power can improve the deterioration of the recorded signal.

Fig. 4 is a view showing the structure of the film layer of the first embodiment, but in order to avoid the influence of the reflection signal, the relationship between the thickness of the recording layer (5) and the absorption rate of the recording disk after the reflection layer (2) is deleted. It can be seen that when the recording layer (5) has a thickness of 11 nm (Example 1), the recording medium has an absorption rate of about 52% (excluding the reflective layer) under laser irradiation of a blue light of 405 nm. If the thickness of the recording layer (5) is increased to 13 nm while maintaining the structure of the other film layer, the recording medium has an absorption rate of about 57% under laser irradiation of a blue light of 405 nm. When the thickness of the recording layer (5) was increased to 15 nm, the recording medium had an absorption rate of about 59% under laser irradiation of a blue light of 405 nm. When the thickness of the recording layer (5) was increased to 17 nm, the recording medium had an absorption rate of about 62% under laser irradiation of a blue light of 405 nm. When the thickness of the recording layer (5) is further increased to 20 nm, the recording medium has an absorption rate of about 68% under laser irradiation of a blue light of 405 nm. From the above results, it can be found that the absorption rate of the disc increases as the thickness of the recording layer (5) increases, and the absorption rate of the recording layer (5) affects the laser energy due to the excessively low or too high absorption rate, thereby affecting The optical properties of the recording layer (5) vary, and the absorption rate is too low or too high, which will degrade the recording sensitivity of the disc. Therefore, under certain recording conditions, the recording medium must have an appropriate range of absorptivity, and the thickness of the recording layer (5) is a major factor affecting the absorptivity of the recording medium.

In order to confirm the influence of the matching of the difference between the thickness of the recording layer (5) and the writing power difference (Pw-Pe) on the reading stability of the recording signal, an application for changing the difference between the thickness of the recording layer (5) and the power of the writing wipe is implemented. Example 2.

Embodiment 2:

A blue-ray disc-RE substrate having grooves and land at a moment with a gauge of 74 μm and a thickness of 1.1 mm was prepared. A 100 nm thick silver (Ag) reflective layer (2) is deposited on the substrate by magnetron sputtering, and then 8 nm thick tantalum nitride (SiN) is deposited on the reflective layer (2) on the first interface layer. (3), then plating a thickness of 8 nm of zinc sulfide-yttria (ZnS-SiO ₂ ) on the first protective layer (4) on the first interface layer (3), and then on the first protective layer (4) A recording layer (5) having a thickness of 13 nm is formed on the upper layer, and a 19 nm thick zinc sulfide-yttria (ZnS-SiO ₂ ) is deposited on the recording layer (5) on the second protective layer (6), and in the second protection. The layer (6) is plated with 30 nm thick tantalum nitride (SiN) on the second interface layer (7). Finally, a light transmission film having a thickness of 0.1 mm was spin-plated on the second protective layer (6) to form a light transmitting layer (8), and the disk of the second embodiment was completed.

As shown in FIG. 5, the disc of the second embodiment is written with a write power of 5.7 mW and an erase power of 3.6 mW (the difference between the write power and the erase power is Pw-Pe=2.1). After the recording signal of the reference clock T of 2 to 8 times, the dynamic test result of the number of signal readings and the jitter value of the disc, as can be seen from the result of FIG. 5, when the recording medium performs the first recording signal, the recording is performed. The jitter values of the marker front end (jitter-L) and the back end (jitter-T) are 5.26 and 6.10, respectively, but after reading the signal continuously at a reading power of 0.35 mW at room temperature, the disc jitter value gradually follows the reading. The number of fetches increases and increases. After continuously reading the signal for 1006,000 times, the jitter values of the jitter front end (jitter-L) and the back end (jitter-T) rise to 6.13 and 6.71, respectively, and the display recording mark deteriorates after multiple low-power readings. In the case, but the jitter value is still maintained below 7.0, indicating that the thickness of the recording layer is increased and the difference between the writing power and the erasing power is adjusted, the deterioration of the recording mark after reading the signal multiple times has been improved. If the thickness of the recording layer (5) is increased to the corresponding absorption rate by the method of the present invention, the application is as in the third embodiment.

Embodiment 3:

A blue-ray disc-RE substrate having grooves and land at a moment with a gauge of 74 μm and a thickness of 1.1 mm was prepared. A layer of 100 nm thick silver (Ag) is deposited on the substrate by magnetron sputtering on the reflective layer (2), and then a thickness of 8 nm of tantalum nitride (SiN) is deposited on the reflective layer (2) on the first interface. Layer (3), and then plating a thickness of 8 nm of zinc sulfide-yttria (ZnS-SiO ₂ ) on the first protective layer (4) on the first interface layer (3), and then on the first protective layer (4) a recording layer (5) having a thickness of 15 nm is formed thereon, and a 19 nm thick zinc sulfide-yttria (ZnS-SiO ₂ ) is deposited on the recording layer (5) on the second protective layer (6), and in the second protection. The layer (6) is plated with 30 nm thick tantalum nitride (SiN) on the second interface layer (7). Finally, a light transmission film having a thickness of 0.1 mm was spin-plated on the second protective layer (6) to form a light transmitting layer (8), and the disk of the third embodiment was completed.

As shown in FIG. 6, the disc of the third embodiment has a write power of 5.9 mW and an erase power of 3.4 mW (the ratio of the write power to the erase power is Pw-Pe=2.5). After 2 to 8 times the recording signal of the reference clock T, the dynamic test result of the number of signal readings and the jitter value of the disc, as can be seen from the result of the sixth figure, when the recording medium performs the first recording signal, the recording mark is recorded. The jitter values of the front end (jitter-L) and the back end (jitter-T) are 5.27 and 6.29, respectively, but after reading the signal continuously at a reading power of 0.35 mW at room temperature, the disc jitter value is gradually read. The number of times increases and rises. After continuously reading the signal 1061000 times, the jitter values of the jitter front end (jitter-L) and the back end (jitter-T) are 5.51 and 6.46, respectively, and the jitter value of the recording mark after reading the low-power reading is only Very slight rise, the jitter value is still maintained below 6.5, showing that increasing the thickness of the recording layer and adjusting the difference between the write power and the erase power, the deterioration of the recorded mark after a number of signal readings has been significantly improved. The recording signal does not deteriorate due to the deterioration of the signal after reading the power for a plurality of times.

If the thickness of the recording layer (5) of the recording medium is further increased to 20 nm, the corresponding absorption rate is 68%, and the sensitivity of the recording layer (5) to the laser light is changed because the absorption rate is too high under this film layer structure. Therefore, it is impossible to smoothly write the recording mark with laser light under the existing film structure.

In the above-mentioned Embodiments 1 to 3, the method for improving the signal reading stability of the present invention is described, which improves the write power difference from 1.9 to 2.5 by controlling the disc absorption rate from 52% to 59%. The signal reading stability of the optical recording medium can be improved without changing or changing the recording medium film structure and the writing erasing strategy. Further, the method for improving the signal reading stability of the present invention is to adjust the difference between the write power and the erase power to properly match the disc absorption rate, and the larger disc absorption rate should be matched with a larger one. The difference between the write power and the erase power is shown in Table 1. At the write speed of BD-1X, when the disc absorption rate is 52%, the difference between the write power and the erase power must be in the range between 2.1 and 2.6; when the disc absorption rate is 57%, The difference between the write power and the erase power shall be in the range between 2.2 and 2.7; when the disc absorbance is 59%, the difference between the write power and the erase power shall be in the range between 2.3 and 2.8; When the disc absorption rate is 62%, the difference between the write power and the erase power must be in the range between 2.5 and 3.0.

The above-mentioned embodiments are only intended to illustrate the technical features and effects of the present invention, and are not intended to limit the scope of the patents of the present invention, and those skilled in the art are entitled to the above description and the scope of the following claims. Variations or modifications of the features and equivalents in terms of their efficiencies are intended to be included within the scope of the present invention.

(1). . . Substrate

(2). . . Reflective layer

(3). . . First interface layer

(4). . . First protective layer

(5). . . Recording layer

(6). . . Second protective layer

(7). . . Second interface layer

(8). . . Light penetrating layer

Fig. 1 is a sectional view showing a structure of a film layer of an optical recording medium of the present invention.

Fig. 2 is a dynamic test result after the disc is continuously overwritten 10 times with a write power of 4.80 mW to 6.33 mW and a write power ratio (Pe/Pw) maintained at 0.65 for the disc of the first embodiment of the present invention. .

Figure 3 is a drawing of the disc of the first embodiment of the present invention with a write power of 5.5 mW and an erase power of 3.6 mW (the difference between the write power and the erase power is Pw-Pe = 1.9). After 2 to 8 times the reference signal of the reference clock T, the dynamic test result of the number of signal readings and the jitter value of the disc.

Fig. 4 is a view showing the structure of the disc film layer of the first embodiment taken in the present invention, and the change in the absorptivity of the disc under the thickness of the different recording layer after the reflective layer is removed.

Figure 5: The disc of the second embodiment of the present invention has a write power of 5.7 mW and an erase power of 3.6 mW (the difference between the write power and the erase power is Pw-Pe = 2.1). After 2 to 8 times the reference signal of the reference clock T, the dynamic test result of the number of signal readings and the jitter value of the disc.

Figure 6 is a condition in which the disc of the third embodiment of the present invention has a write power of 5.9 mW and an erase power of 3.4 mW (the ratio of the write power to the erase power is Pw-Pe = 2.5). 2 to 8 times the reference signal of the reference clock T, the dynamic test result of the number of signal readings and the jitter value of the disc.

(1). . . Substrate

(2). . . Reflective layer

(3). . . First interface layer

(4). . . First protective layer

(5). . . Recording layer

(6). . . Second protective layer

(7). . . Second interface layer

(8). . . Light penetrating layer

Claims (16)

An optical recording medium comprising a substrate, a reflective layer, at least one protective layer, a recording layer, at least one interface layer and a light transmissive layer; wherein the protective layer prevents the recording layer and the reflective layer from occurring during heating Thermal energy diffusion provides proper thermal insulation and optical compensation; the reflective layer is in contact with the interface layer to provide excellent optical reflection and thermal conductivity; and the interface layer is used to control the overall recording layer of the recording medium when writing signals. Appropriate heat dissipation, overall absorption rate and optical compensation, and the optical recording medium does not include the reflective layer, the light absorption rate is between 52% and 70%, corresponding to the difference between the write power and the erase power (Pw-Pe) Between 2.1 and 3.0. The optical recording medium according to claim 1, wherein the optical recording medium can be irradiated by laser light projected on the opposite side of the substrate to perform reading and writing of the data; and the adjustment of the structure of the film layer can also be performed by using the laser light incident on the substrate side. Data reading and writing. The optical recording medium according to claim 1, wherein the recording layer has a thickness of between 3 nm and 30 nm. The optical recording medium according to claim 1, wherein the recording layer material contains at least selected from the group consisting of germanium (Ge), indium (In), antimony (Sb), tin (Sn), gallium (Ga), and antimony (Te). One of them. The optical recording medium of claim 1, wherein the first protective layer and the second protective layer have a thickness of between 1 nm and 200 nm, and the material thereof may be zinc sulfide-yttria (ZnS-SiO _{2 ).} ), tantalum nitride (SiN or Si ₃ N ₄ ), tantalum nitride (GeN), tantalum carbide (SiC), cerium oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), titanium dioxide (TiO _{2 )} One of the dielectric materials, or one or more of the foregoing dielectric materials. The optical recording medium according to claim 1, wherein the reflective layer material is gold (Au), silver (Ag), molybdenum (Mo), aluminum (Al), titanium (Ti), tantalum (Ta). One of the elements, or an alloy based on it. The optical recording medium according to claim 1, wherein the light penetrating layer is a photohardenable resin. The optical recording medium according to claim 1, wherein the substrate can be a ruthenium substrate or a material having optical transparency, and can provide appropriate mechanical strength, including polycarbonate resin, polymethylation. Polymethyl methacrylate, polystyrene resin, polyethylene resin, polypropylene resin, and the like. An optical recording medium comprising a substrate, a reflective layer, a protective layer, a recording layer and a light transmissive layer; wherein the protective layer prevents heat generation between the recording layer and the reflective layer during heating, and provides appropriate heat insulation The effect is as well as optical compensation; the reflective layer is in contact with the interface layer to provide excellent optical reflection and thermal conductivity; wherein the reflective layer is above the substrate, the protective layer is above the reflective layer, the recording layer is above the protective layer, and the light is When the penetrating layer is located above the recording layer, and the optical recording medium does not include the reflective layer, the light absorption rate is between 52% and 70%, corresponding to the difference between the writing power and the erasing power (Pw-Pe) Between 2.1 and 3.0. The optical recording medium of claim 9, which can be irradiated by laser light projected on the opposite side of the substrate to perform reading and writing of data; and the adjustment of the structure of the film layer can also be performed by using laser light incident on the substrate side. Data reading and writing. The optical recording medium according to claim 9, wherein the recording layer has a thickness of between 3 nm and 30 nm. The optical recording medium of claim 9, wherein the recording layer material contains at least selected from the group consisting of germanium (Ge), indium (In), antimony (Sb), tin (Sn), gallium (Ga), and antimony (Te). One of them. The optical recording medium according to claim 9, wherein the protective layer has a thickness of between 1 nm and 200 nm, and the material thereof may be zinc sulfide-yttria (ZnS-SiO ₂ ) or tantalum nitride (SiN). Or a dielectric material such as Si ₃ N ₄ ), tantalum nitride (GeN), tantalum carbide (SiC), cerium oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), or titanium dioxide (TiO ₂ ). One of them is composed of two or more of the aforementioned dielectric materials. The optical recording medium according to claim 9, wherein the reflective layer material is gold (Au), silver (Ag), molybdenum (Mo), aluminum (Al), titanium (Ti), tantalum (Ta). One of the elements, or an alloy based on it. The optical recording medium according to claim 9, wherein the light penetrating layer is a photohardenable resin. The optical recording medium of claim 9, wherein the substrate can be a ruthenium substrate or a material having optically transparent properties, and can provide appropriate mechanical strength, including polycarbonate resin, polymethylation Polymethyl methacrylate, polystyrene resin, polyethylene resin, polypropylene resin, and the like.