TW200818183A - Optical recording medium - Google Patents

Abstract

To provide an optical recording medium including: first and second information layers, and an intermediate layer disposed between the first and second information layers, wherein the first and second information layers are disposed in this order from the side of light incidence and the second information layer includes a second substrate, and wherein the form of a groove provided in the second substrate and the thickness of the intermediate layer are adjusted so that a push pull signal in the second information layer in an unrecorded condition is 0.22 or more and the relation between amplitude "a" of jump-back signal measured upon tracking on a portion of the second information layer that corresponds to a boundary between recorded area and unrecorded area in the first information layer and amplitude "b" of defect signal locally generated by the influence of the first information layer satisfies 0 ≤ b/a ≤ 0.35.

Description

200818183 九、發明說明 【發明所屬之技術領域】 本發明與光學記錄媒體有關，特別是與單面雙層光學 記錄媒體有關。 【先前技術】 已開始有數位廣播，且數位陸上廣播將藉由根據原規 φ 格所製備之用於處理高容量數位影像內容的基礎建設，在 五年內全面取代類比廣播。用以記錄這些內容的高速大量 儲存裝置之範例包括硬碟，且具有1 TB (兆位元組）之容 量的硬碟已被實現。 另一方面，對光學記錄媒體而言，市面上已引進使用 波長405 nm的雷射光束之容量25GB或50GB的Blu-ray 碟片及其記錄設備。儲存有電影內容的Blu-ray ROM碟片 及其再生設備現在已準備要上市。 β 使用波長405 nm之雷射光束的系統包括Bliway標準 系統和HD DVD標準系統，其儲存容量相異，因所採用的 物鏡之數値孔徑NA不同。當對HD DVD標準系統使用數 値孔徑NA爲0.65的物鏡時，單面光學記錄媒體會具有 15GB的容量，而雙層爲30GB，因此儲存容量比Blu-ray 碟片少。然而，由於具有低碟片製造成本的優點，最近已 發表了符合HD DVD標準的ROM碟片及其再生設備。 諸如單寫型「可記錄」碟片和「可複寫」碟片的HD DVD型記錄碟片已準備上市。由於可複寫碟片不僅用來做 -5- 200818183 爲記錄器的光學記錄媒體，亦用來做爲個人電腦用於處理 高容量影像檔案的光學記錄媒體，故可得到自媒體之內溝 軌循序記錄至外溝軌的循序記錄系統以及適合記錄多個小 容量之檔案的隨機記錄系統。循序記錄系統適用於單寫型 可記錄媒體。隨機記錄系統可使記錄媒體處於已記錄區和 未記錄區隨機存在的狀態。可毫無問題地以循序記錄系統 和隨機記錄系統中的任一者來記錄單面單層媒體。可藉由 隨機記錄來記錄諸如 DVD + RW、DVD-RW、BD-RE ( Blu-ray可複寫碟片）的單面雙層媒體。 專利文件1〜3揭示了使用藍色雷射加以記錄的光學記 錄媒體，但其並未揭示這些技術和隨機記錄之間的關聯。 專利文件1 :國際專利公告第W Ο 0 3 / 0 2 5 9 2 2號 專利文件2:日本專利申請案公開（jp_A)第200 1 -243655 號 專利文件3 ··日本專利（JP-B )第3 5 6 1 7 1 1號 【發明內容】 本發明係鑒於上述情況所提出，且本發明之目的是爲 了解決上述習知技術中的問題，並達成以下目標。 在使用波長405 nm且數値孔徑NA爲0.85的物鏡之 BD系統的情況中，單面雙層光學記錄媒體係具有厚度25 μηι的中間層，以將兩資訊層隔開。在此媒體中，當已記 錄區（晶相和非晶相）和未記錄區（只有晶相）隨機存在 設置於光入射側之第一資訊層中時，可毫無問題地在對應 -6- 200818183 第 的 〇 爲 間 存 資 偏 第 大 雙 在 的 資 間 入 中 度 22 區 回 於第一資訊層之已記錄區和未記錄區之間之邊界的內側 二資訊層之部份上執行記錄和再生。這表示第一資訊層 狀態鮮少會影響第二資訊層，且這兩層之間的串擾很小 另一方面，在使用波長405 nm但數値孔徑NA 0.65之物鏡的HD DVD系統，以及具有厚度25 μιη之中 層的單面雙層光學記錄媒體之情況中，當在對應於隨機 在第一資訊層中之已記錄區和未記錄區間之邊界的第二 ϋ 訊層之部份上對溝槽進行循軌同時執行記錄時，會發生 軌（off-track )。這表示第一資訊層的狀態會大量影響 二資訊層，且在此系統和媒體的狀態下，層間的串擾很 〇 因此，本發明之目的是提供可用於隨機記錄的單面 層光學記錄媒體，其中即使已記錄區和未記錄區隨機存 第一資訊層中，仍可毫無問題地藉由調整光學記錄媒體 狀態來記錄及再生第二資訊層，而無需改變系統。 φ 這些問題可由下列&lt;1&gt;〜&lt;2&gt;所解決。 &lt;1&gt; 一種光學記錄媒體，包括：第一資訊層；第二 訊層；和設置於該第一資訊層和該第二資訊層之間的中 層，其中該第一資訊層和該第二資訊層係以此順序自光 射側加以設置，且該第二資訊層包括第二基板，以及其 係調整設於該第二基板中之溝槽的形狀和該中間層的厚 ，使得於未記錄狀態之該第二資訊層中的推挽信號爲〇, 以上，在於對應於該第一資訊層中之已記錄區和未記錄 之間的邊界之一部份該第二資訊層上循軌時所測得的躍 200818183 信號之振幅「a」和由該第一資訊層之影響所局部產生的 缺陷信號之振幅「b」之間的關係滿足以下要件： 0 &lt; b/a &lt; 0.35 &lt;2&gt;根據&lt;1&gt;之光學記錄媒體，其中構成用於該第一 資訊層和該第二資訊層之記錄層材料的元素包含Ag、In 、Sb、Te、和 Ge。 【實施方式】 下文中將說明本發明。 用於使用波長4 0 5 nm之雷射光束和數値孔徑NA 0.6 5 之物鏡的HD DVD標準系統之光學記錄媒體係具有和 DVD相同的基板厚度及媒體結構，並可使用習知設備加以 製造。因此，其可以低於Blu-ray碟片的成本加以製造， 並因成本上的優點而助長其開發。HD DVD標準的光學記 錄媒體具有15 GB之容量，且雙層爲30 GB，亦即大於單面 單層Blu-ray碟片的25GB。因此，就容量來看，係對雙層 光學記錄媒體有所期待。 但在該雙層光學記錄媒體中，將第一資訊層和第二資 訊層隔開的中間層很薄，且無法忽視這兩層之間的串擾之 影響。此外，第二資訊層的記錄感度可根據第一資訊層是 否被記錄而有所不同。 -8- 200818183 使 資 變 〇 的 第 訊 更 體 記 含 及 訊 例 12 反 第 第 20 可藉由在第一資訊層已被記錄時使透光率變高，並 已記錄區和未記錄區之間的透光率差異變小來降低第二 訊層之記錄感度的變化。但當第二資訊層之記錄感度的 化大時，應在檢查第一資訊層的狀態時記錄第二資訊層 否則，第二資訊層的特性會大量變化。爲了使記錄感度 變化變小而使透光率變高。然而，當在對應於隨機存在 一資訊層中之已記錄區和未記錄區之間之邊界的第二資 層之部份上執行記錄時，偏軌的發生是比記錄特性變化 嚴重的問題。 本發明之發明人已發現單面雙層光學記錄媒體的媒 特性之最理想條件，其中即使第一資訊層中隨機存在已 錄區和未記錄區，該條件仍允許隨機記錄。 第1圖顯示單面雙層光學記錄媒體的結構範例，其 有設置在光入射側（箭頭）的資訊層1、中間層2、以 設置在內側的第二資訊層3。另外，第2圖顯示第一資 層1的結構範例，而第3圖顯示第二資訊層3的結構範 。在資訊層1中，第一下介電保護層1 1、第一記錄層 、第一上介電保護層13、第一硫化防止層14、半透過 射層1 5、光學調整層1 6係依此順序設置於具有溝槽的 一基板4上。第二資訊層3含有第二下介電保護層1 7、 二記錄層1 8、第二上介電保護層1 9、第二硫化防止層 、第二反射層21、和具有溝槽的第二基板5。 對於第一和第二記錄層，以使用由含有約70原子％之 Sb的Sb-Te共熔成份所構成之材料爲佳。其範例包括Ag- 200818183BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to optical recording media, and more particularly to single-sided, double-layer optical recording media. [Prior Art] Digital broadcasting has begun, and digital terrestrial broadcasting will completely replace analog broadcasting within five years by the infrastructure for processing high-capacity digital video content prepared according to the original specification. An example of a high-speed mass storage device for recording such content includes a hard disk, and a hard disk having a capacity of 1 TB (megabytes) has been implemented. On the other hand, for an optical recording medium, a Blu-ray disc having a capacity of 25 GB or 50 GB of a laser beam having a wavelength of 405 nm and a recording apparatus thereof have been introduced on the market. Blu-ray ROM discs with movie content and their regenerative equipment are now ready for launch. The system using a laser beam with a wavelength of 405 nm includes the Blive standard system and the HD DVD standard system, and the storage capacity is different because of the difference in the number of apertures NA used. When an objective lens with a numerical aperture of 0.65 is used for the HD DVD standard system, the single-sided optical recording medium has a capacity of 15 GB, and the double layer is 30 GB, so the storage capacity is less than that of the Blu-ray disc. However, due to the advantages of low disc manufacturing cost, a ROM disc conforming to the HD DVD standard and its reproducing apparatus have recently been published. HD DVD-type recording discs such as single-write "recordable" discs and "rewritable" discs are available. Since the rewritable disc is not only used as an optical recording medium for recorders, but also as an optical recording medium for processing high-capacity image files on a personal computer, it can be obtained from the inner channel of the media. A sequential recording system for recording to the outer track and a random recording system suitable for recording multiple small-capacity files. The sequential recording system is suitable for single-write type recordable media. The random recording system allows the recording medium to be in a state in which the recorded area and the unrecorded area are randomly present. Any one of the sequential recording system and the random recording system can be recorded without any problem to record single-sided single-layer media. Single-sided double-layer media such as DVD + RW, DVD-RW, BD-RE ( Blu-ray rewritable disc) can be recorded by random recording. Patent Documents 1 to 3 disclose optical recording media recorded using a blue laser, but it does not disclose the correlation between these techniques and random recording. Patent Document 1: International Patent Publication No. W Ο 0 3 / 0 2 5 9 2 2 Patent Document 2: Japanese Patent Application Publication (jp_A) No. 2001-243655 Patent Document 3 · Japanese Patent (JP-B) Clause 3 5 6 1 7 1 1 SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to solve the above problems in the prior art and achieve the following object. In the case of a BD system using an objective lens having a wavelength of 405 nm and a number of apertures NA of 0.85, the single-sided double-layer optical recording medium has an intermediate layer having a thickness of 25 μm to separate the two information layers. In this medium, when the recorded area (crystalline phase and amorphous phase) and the unrecorded area (only crystal phase) are randomly present in the first information layer disposed on the light incident side, the corresponding -6 can be solved without problems. - 200818183 The first 〇 〇 第 第 第 第 第 第 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 Record and regenerate. This means that the first information layer state rarely affects the second information layer, and the crosstalk between the two layers is small. On the other hand, the HD DVD system uses an objective lens with a wavelength of 405 nm but a number of apertures of NA 0.65, and In the case of a single-sided, two-layer optical recording medium having a thickness of 25 μm, the groove is formed on a portion of the second layer corresponding to the boundary between the recorded area and the unrecorded area randomly located in the first information layer. When the slot performs tracking while performing recording, an off-track occurs. This means that the state of the first information layer greatly affects the two information layers, and in this state of the system and the media, the crosstalk between the layers is very low. Therefore, the object of the present invention is to provide a single-sided optical recording medium that can be used for random recording. Even if the recorded area and the unrecorded area are randomly stored in the first information layer, the second information layer can be recorded and reproduced without any problem by adjusting the state of the optical recording medium without any problem. φ These problems can be solved by the following &lt;1&gt;~&lt;2&gt;. &lt;1&gt; An optical recording medium comprising: a first information layer; a second layer; and a middle layer disposed between the first information layer and the second information layer, wherein the first information layer and the second layer The information layer is disposed from the light side in this order, and the second information layer includes a second substrate, and the shape of the groove disposed in the second substrate and the thickness of the intermediate layer are adjusted so that The push-pull signal in the second information layer of the recording state is 〇, and the tracking is performed on the second information layer corresponding to one of the boundary between the recorded area and the unrecorded in the first information layer. The relationship between the amplitude "a" of the measured signal of the 200818183 signal and the amplitude "b" of the defect signal locally generated by the influence of the first information layer satisfies the following requirements: 0 &lt; b/a &lt; 0.35 &lt;2&gt; The optical recording medium according to <1>, wherein the elements constituting the recording layer material for the first information layer and the second information layer comprise Ag, In, Sb, Te, and Ge. [Embodiment] Hereinafter, the present invention will be described. The optical recording medium for the HD DVD standard system using a laser beam of wavelength 405 nm and an objective lens of several apertures NA 0.6 5 has the same substrate thickness and media structure as the DVD, and can be fabricated using conventional equipment. . Therefore, it can be manufactured at a lower cost than the Blu-ray disc and contributes to its development due to cost advantages. The HD DVD standard optical recording media has a capacity of 15 GB and a double layer of 30 GB, which is 25 GB larger than a single-sided single-layer Blu-ray disc. Therefore, in terms of capacity, there is an expectation for a two-layer optical recording medium. However, in the two-layer optical recording medium, the intermediate layer separating the first information layer from the second information layer is thin, and the influence of crosstalk between the two layers cannot be ignored. In addition, the recording sensitivity of the second information layer may be different depending on whether or not the first information layer is recorded. -8- 200818183 The newsletter of the change of capital and the case 12 The anti-20th can make the light transmittance higher when the first information layer has been recorded, and the recorded area and the unrecorded area The difference in transmittance between the two becomes smaller to reduce the change in the recording sensitivity of the second layer. However, when the recording sensitivity of the second information layer is large, the second information layer should be recorded while checking the state of the first information layer. Otherwise, the characteristics of the second information layer may vary greatly. In order to make the change in recording sensitivity smaller, the light transmittance is made higher. However, when recording is performed on a portion of the second layer corresponding to the boundary between the recorded area and the unrecorded area in the random existence information layer, the occurrence of the off-track is a problem that is more severe than the change in the recording characteristics. The inventors of the present invention have found the most desirable condition for the media characteristics of a single-sided, two-layer optical recording medium in which the condition allows random recording even if the recorded area and the unrecorded area are randomly present in the first information layer. Fig. 1 shows an example of the structure of a single-sided double-layer optical recording medium having an information layer 1 disposed on a light incident side (arrow), an intermediate layer 2, and a second information layer 3 disposed inside. In addition, Fig. 2 shows an example of the structure of the first layer 1, and Fig. 3 shows the structure of the second layer 3. In the information layer 1, the first lower dielectric protective layer 1 1 , the first recording layer, the first upper dielectric protective layer 13 , the first vulcanization preventing layer 14 , the semi-transmissive insulating layer 15 , and the optical adjustment layer 16 are In this order, it is disposed on a substrate 4 having a groove. The second information layer 3 includes a second lower dielectric protective layer 17 , a second recording layer 18 , a second upper dielectric protective layer 19 , a second vulcanization preventing layer, a second reflective layer 21 , and a trench having Two substrates 5. For the first and second recording layers, it is preferred to use a material composed of a Sb-Te eutectic composition containing about 70 at% of Sb. Examples include Ag-200818183

In-Ge-Sb-Te。對高速記錄而言，其範例包括含有Ge_In-In-Ge-Sb-Te. For high-speed recording, examples include Ge_In-

Sb做爲主成份並摻雜有zn、Te、和Ga其中至少一者的材 料，以及含有Ge-Sn-Sb做爲主成份並摻雜有Μη和Zn其 中至少一者的材料。 第一記錄層的厚度以5 nm〜9 nm爲佳。當厚度小於5 nm時，透光率會太高，記錄感度會降低，且溫度無法上 升到足以使記錄層熔化的程度。因此，不易形成非晶相， 且複寫特性會變差。當厚度大於9 nm時，第一資訊層的 透光率會太低，且第二資訊層的記錄感度會大量降低。然 而，此應不適用於記錄設備之夠高的雷射功率。 第二記錄層的厚度以10 nm〜20 nm爲佳，1〇 nm〜15 nm更佳。當厚度小於 1 0 nm時，吸光性會降低，且特性 會由於記錄感度和反射率降低而變差。當厚度大於20 nm 時，覆寫特性會變差。 半透過反射層的材料以Ag和含有0.2質量％〜5.〇質 量％之選自Bi、Cu、In、和Pd的至少一金屬元素之Ag合 金爲佳。 半透過反射層的厚度以7 nm〜12 nm爲佳。當厚度小 於7 nm時，反射率和冷卻速率會降低，然後不易形成非 晶相，且調變度會變小。當厚度爲1 2 nm以上時，透光率 會太低，第二資訊層的記錄感度會明顯降低。 可將半透過反射層的材料用於第二反射層。 第二反射層的厚度以1 0 0 n m〜1 6 0 n m爲佳。小於！ 〇 〇 nm的厚度會導致放熱能力不良、標記長度變短、面積變 -10- 200818183 小、以及特性不良。大於丨60 nm的厚度會導致記錄感度 降低。 用於各資訊層的介電保護層係以透明、熔點高於記錄 層、並可改善記錄層之環境阻力的材料所製成爲佳。在單 面單層相變光學記錄媒體中，經常使用ZnS-Si02的混合 物來做爲介電保護層的材料，而ZnS對Si 02的比例以80 ·· 20 (莫耳％)爲佳。 然而’由於單面雙層光學記錄媒體的半透過反射層比 單面單層光學記錄媒體的薄，故其放熱能力會降低，且不 易形成非晶相。較佳係對第一上介電保護層使用導熱性儘 可能高的材料。根據記錄線性速度和記錄感度，選擇使用 ZnS-Si02或具有較高放熱能力的氧化物。 具有較高放熱能力的氧化物之範例包括諸如ZnO、Sb is a main component and is doped with a material of at least one of zn, Te, and Ga, and a material containing Ge-Sn-Sb as a main component and doped with at least one of Μη and Zn. The thickness of the first recording layer is preferably 5 nm to 9 nm. When the thickness is less than 5 nm, the light transmittance is too high, the recording sensitivity is lowered, and the temperature is not raised enough to melt the recording layer. Therefore, it is difficult to form an amorphous phase, and the rewriting characteristics are deteriorated. When the thickness is greater than 9 nm, the transmittance of the first information layer is too low, and the recording sensitivity of the second information layer is greatly reduced. However, this should not apply to the high enough laser power of the recording device. The thickness of the second recording layer is preferably 10 nm to 20 nm, and more preferably 1 nm to 15 nm. When the thickness is less than 10 nm, the light absorbability is lowered, and the characteristics are deteriorated due to a decrease in recording sensitivity and reflectance. When the thickness is greater than 20 nm, the overwrite characteristics are deteriorated. The material of the semi-transmissive reflective layer is preferably Ag and an Ag alloy containing at least one metal element selected from the group consisting of Bi, Cu, In, and Pd in an amount of 0.2% by mass to 5.5% by mass. The thickness of the semi-transmissive reflective layer is preferably 7 nm to 12 nm. When the thickness is less than 7 nm, the reflectance and the cooling rate are lowered, and then the amorphous phase is less likely to be formed, and the modulation degree becomes small. When the thickness is above 12 nm, the light transmittance will be too low, and the recording sensitivity of the second information layer will be significantly lowered. A material that is semi-transmissive to the reflective layer can be used for the second reflective layer. The thickness of the second reflective layer is preferably from 1 0 0 n to 1 60 nm. Less than!厚度 〇 nm thickness will result in poor heat release capability, short mark length, and area change -10- 200818183 small, and poor characteristics. Thickness greater than 丨60 nm results in reduced recording sensitivity. The dielectric protective layer for each information layer is preferably made of a material which is transparent, has a higher melting point than the recording layer, and can improve the environmental resistance of the recording layer. In the single-sided single-layer phase change optical recording medium, a mixture of ZnS-SiO 2 is often used as the material of the dielectric protective layer, and the ratio of ZnS to Si 02 is preferably 80 · · 20 (mol %). However, since the semi-transmissive reflective layer of the single-sided double-layer optical recording medium is thinner than the single-sided single-layer optical recording medium, the heat releasing ability thereof is lowered, and the amorphous phase is not easily formed. It is preferable to use a material having as high a thermal conductivity as possible for the first upper dielectric protective layer. Depending on the recorded linear velocity and recording sensitivity, ZnS-SiO2 or an oxide with a higher exothermic ability is selected. Examples of oxides with higher exothermic capabilities include, for example, ZnO,

Sn〇2、AI2O3、Ti〇2、In2〇3、MgO、Zr〇2、TaO、Ta2〇5、 和Nb205的金屬氧化物。可使用諸如選自該等金屬氧化物 之ZnO和Al2〇3的混合物之複合氧化物。 第一上介電保護層的厚度以10 nm〜3 0 nm爲佳。當厚 度小於1 0 nm時，記錄感度會降低。當厚度大於3 0 nm時 ，會不利地影響覆寫特性，且反射率會降低。 第二上介電保護層的厚度以15 nm〜3 0 nm爲佳。當厚 度小於1 5 nm時，記錄感度會降低。當厚度大於3 0 nm時 ，會不利地影響覆寫特性，且反射率會降低。 第一下介電保護層的厚度以40 nm〜60 nm爲佳。當厚 度小於40 nm時，會不利地影響覆寫特性，且記錄標記的 -11 - 200818183 品質會在高溫環境下明顯變差。當厚度大於60 nm時，反 射率會提高，且記錄感度會降低。 第二下介電保護層的厚度以40 nm〜75 nm爲佳。當厚 度小於40 nm時，會不利地影響覆寫特性’且記錄標記的 品質會在高溫環境下明顯變差。當厚度大於75 nm時，反 射率會提高，且記錄感度會降低。 當半透過反射層或第二反射層含有Ag’且含有s的 材料係用於上介電保護層時，必須設置硫化防止層以防止 A g和S之間的反應。硫化防止層的材料以具有微量吸光 性的氧化物爲佳。其範例包括含有Nb205來做爲主成份的 氧化物。 硫化防止層的厚度以2 nm〜7 nm爲佳。當厚度小於2 nm時，會因該層的不均勻性而失去防止效果。當厚度大 於7 nm時，反射率和記錄感度會降低。 由於光學調整層會冷卻由光線所照射的第一記錄層， 故以對光學調整層使用具有較高導熱性和透光率、較小光 吸收率、及較高折射库的材料爲佳。其範例包括InSnOx、 InZnOx、Ti02、Bi203、Li203、W03 及其混合物。 光學調整層的厚度以 l〇 nm〜40 nm爲佳，15 nm〜30 nm更佳。當厚度小於1 0 nm時，第一資訊層的透過率會 降低，且第二資訊層所需的記錄功率會變得比所需要的還 強。大於40 nm的厚度會導致相同的情況。 第一^和第二基板必須由足以通過用於記錄和再生之光 線的材料所製成，並可應用習知技術中已知的材料、 -12- 200818183 亦即，可使用玻璃、陶瓷、或樹脂，且就其可成 和成本而言，樹脂尤佳。 樹脂的範例包括聚碳酸酯樹脂、壓克力樹脂、環 脂、聚苯乙烯樹脂、丙烯腈-苯乙烯共聚物樹脂、聚 樹脂、聚丙烯樹脂、矽烷樹脂、氟樹脂、AB S樹脂、 酯樹脂。其中，就其可成形性、光學性質、和成本而 聚碳酸酯樹脂和諸如聚甲基丙烯酸甲酯（PMMA )的 φ 力樹脂尤佳。 在將被設置第一資訊層的第一基板之表面上，形 如螺旋或同心溝槽、或是引導溝槽的凹凸圖案。該凹 案一般是由射出成型或光聚合物法所形成。 第一基板的厚度以5 90 mm〜610 mm爲佳。第一 的溝槽深度以2 3 n m〜2 9 n m爲佳。 第二基板的厚度以0.595 mm〜0.605 mm爲佳。第 板的溝槽深度以23 nm〜27 nm爲佳。 φ 上述範圍中的溝槽深度允許第一和第二資訊層皆 具有3%以上的反射率。上述範圍亦以確保做爲溝槽 的推挽信號爲佳。小於23 nm的溝槽深度會導致較高 射率，但推挽信號小於0.22。當推挽信號小於0.22 ' 無法在某個溝軌（溝槽）中穩定地執行循軌，且推挽 越小，偏軌發生的機率越高。當溝槽深度大於27 nm 推挽信號會變大，但反射率變成小於3 %。推挽信號 至少超過0.22，以達成本發明之目的，亦即，確保已 第一資訊層中之已記錄區和未記錄區之間的邊界之光 形性 氧樹 乙烯 和胺 言， 壓克 成諸 凸圖 基板 二基 確實 信號 的反 時， 信號 時， 必須 通過 束聚 -13- 200818183 二。 第定 於穩 焦仍 軌 ΊΕ1 循 響 影 的 層 訊 資 1 第 到 受 使 即 且 上 層 訊 訊顯 資明 一 很 第得 由變 但 會 ， 響 軌影 循的 的號 定信 穩差 生誤 產軌 •會循 度之 深生 槽產 溝部 大局 ， 所 而響 然影 的 層 。因此，推挽信號必須大於0·22，此爲穩定循軌的最低限 度。在此條件下，可以實驗證實，只要沒有誤差產生，或 是即使產生誤差，只要b/a爲0.35以下（b/0.35;其中 b / a是第一資訊層之影響所局部產生的缺陷信號之振幅r b 」（循軌誤差信號的振幅「b」）對在於一部份第二資訊 層上循軌時所測得的躍回信號之振幅「a」的比率），則 在第二資訊層的循序循軌饋送、記錄、及再生期間，不會 發生偏軌。 爲了記錄與再生，中間層對所選擇之光線波長的的吸 光性最好很小。就其可成形性和成本而言，中間層的材料 較佳爲樹脂，且其範例包括可由紫外線硬化之樹脂、緩凝 樹脂、和熱塑性樹脂。可在中間層上形成諸如由射出成型 或光聚合物法所形成之引導溝槽的凹凸圖案。 中間層的厚度「e」以25 μιη〜33 μπι爲佳。當中間層 比25 μηι還薄時，由於已通過第一資訊層之光束對第二資 訊層所造成的影響，在最理想的溝槽深度上，誤差信號振 幅「b」會變大，且b/a之値會超過0.35。另一方面，隨 著中間層變得比3 3 μιη還厚，第二資訊層中的推挽信號本 身會由於像差而變成小於0·22。誤差信號振幅「b」亦會 變小。 -14- 200818183 第一和第二資訊層的反射率分別以3.0%〜6.0%爲佳。 當反射率小於3.0%時，資訊記錄再生設備會無法執行聚 焦及循軌。另一方面，在相變光學記錄媒體中係難以具有 6.0%以上的反射率。特別是，第一和第二資訊層無法一起 具有6.0%以上的反射率。即使成功地使第一資訊層或第 二資訊層具有6.0%以上的反射率，反射率差會更大，且 在由第一資訊層轉移至第二資訊層時會無法良好地執行聚 焦。第一和第二資訊層以一起具有3%〜4%的反射率爲佳。 本發明的單面雙層光學記錄媒體必須可在使用波長 405 nm之雷射光束和數値孔徑NA爲0.65之物鏡的系統 中記錄及再生，並可允許使用者在空白的第一和第二資訊 層上隨機記錄影像和文字資訊。爲此目的，中間層的厚度 以25士5 μιη爲佳。 此情況下所發生的問題範例包括，如第4圖所示，在 於/從對應於隨機存在第一資訊層中之已記錄區和未記錄 區之間的邊界之第二資訊層的部份X、Υ記錄/再生時，會 發生偏軌。第4圖中，已記錄區爲第一資訊層的中心部份 ，而未記錄區爲第一資訊層的兩側。這是因爲當以通過第 一資訊層中之已記錄區和未記錄區間之邊界的光線照射第 二資訊層來再生資訊時，光學讀寫頭（optical pick-up ) 中的PD (光二極體）會收到第一資訊層的串擾。 換言之，在稱爲差分推挽法（Differential Push Pull Method)的循軌方法中（其中入射光束被分爲三道光束） ，當與位於溝槽之主光束相鄰的位於岸部（land part )之 -15-Metal oxides of Sn 〇 2, AI 2 O 3 , Ti 〇 2, In 2 〇 3, MgO, Zr 〇 2, TaO, Ta 2 〇 5, and Nb 205. A composite oxide such as a mixture of ZnO and Al2〇3 selected from the metal oxides may be used. The thickness of the first upper dielectric protective layer is preferably 10 nm to 30 nm. When the thickness is less than 10 nm, the recording sensitivity is lowered. When the thickness is more than 30 nm, the overwrite characteristics are adversely affected and the reflectance is lowered. The thickness of the second upper dielectric protective layer is preferably 15 nm to 30 nm. When the thickness is less than 15 nm, the recording sensitivity is lowered. When the thickness is more than 30 nm, the overwrite characteristics are adversely affected and the reflectance is lowered. The thickness of the first lower dielectric protective layer is preferably 40 nm to 60 nm. When the thickness is less than 40 nm, the overwrite characteristics are adversely affected, and the quality of the recorded mark -11 - 200818183 is significantly deteriorated in a high temperature environment. When the thickness is greater than 60 nm, the reflectance is increased and the recording sensitivity is lowered. The thickness of the second lower dielectric protective layer is preferably 40 nm to 75 nm. When the thickness is less than 40 nm, the overwrite characteristic is adversely affected and the quality of the recording mark is significantly deteriorated in a high temperature environment. When the thickness is greater than 75 nm, the reflectance is increased and the recording sensitivity is lowered. When the semi-transmissive reflective layer or the second reflective layer contains Ag' and the material containing s is used for the upper dielectric protective layer, a vulcanization preventing layer must be provided to prevent the reaction between A g and S. The material of the vulcanization preventing layer is preferably an oxide having a slight light absorbability. Examples include oxides containing Nb205 as a main component. The thickness of the vulcanization preventing layer is preferably 2 nm to 7 nm. When the thickness is less than 2 nm, the prevention effect is lost due to the unevenness of the layer. When the thickness is more than 7 nm, the reflectance and recording sensitivity are lowered. Since the optical adjustment layer cools the first recording layer irradiated with light, it is preferred to use a material having a higher thermal conductivity and light transmittance, a smaller light absorptivity, and a higher refractive index for the optical adjustment layer. Examples thereof include InSnOx, InZnOx, TiO2, Bi203, Li203, W03, and mixtures thereof. The thickness of the optical adjustment layer is preferably from 1 〇 nm to 40 nm, and more preferably from 15 nm to 30 nm. When the thickness is less than 10 nm, the transmittance of the first information layer is lowered, and the recording power required for the second information layer becomes stronger than necessary. Thicknesses greater than 40 nm result in the same situation. The first and second substrates must be made of a material sufficient to pass light for recording and reproduction, and may be applied to materials known in the art, -12-200818183, that is, glass, ceramic, or Resin, and resin is particularly preferred in terms of its cost and cost. Examples of the resin include polycarbonate resin, acrylic resin, cycloaliphatic resin, polystyrene resin, acrylonitrile-styrene copolymer resin, poly resin, polypropylene resin, decane resin, fluororesin, AB S resin, ester resin . Among them, a polycarbonate resin and a φ force resin such as polymethyl methacrylate (PMMA) are particularly preferable in terms of formability, optical properties, and cost. On the surface of the first substrate on which the first information layer is to be disposed, such as a spiral or concentric groove, or a concave-convex pattern of the guiding groove. The recess is generally formed by injection molding or photopolymerization. The thickness of the first substrate is preferably 5 90 mm to 610 mm. The first groove depth is preferably 2 3 n m to 2 9 n m. The thickness of the second substrate is preferably 0.595 mm to 0.605 mm. The groove depth of the first plate is preferably 23 nm to 27 nm. φ The groove depth in the above range allows both the first and second information layers to have a reflectance of 3% or more. The above range is also preferable to ensure a push-pull signal as a groove. A trench depth of less than 23 nm results in a higher rate, but a push-pull signal is less than 0.22. When the push-pull signal is less than 0.22', tracking cannot be performed stably in a certain groove (groove), and the smaller the push-pull is, the higher the probability of occurrence of the derailment. When the trench depth is greater than 27 nm, the push-pull signal becomes larger, but the reflectance becomes less than 3%. The push-pull signal is at least more than 0.22 to achieve the object of the present invention, that is, to ensure that the light-shaped oxygen tree ethylene and amine at the boundary between the recorded area and the unrecorded area in the first information layer are pressed into each other. The two bases of the convex substrate are indeed opposite to the signal, and the signal must pass through the beam to gather-13-200818183. The first decision is to stabilize the focus and still track the 1 layer of the signal. The first message is received, and the upper level of the news is clearly changed, but the number of the track will be stable. • The depth of the deep groove of the production channel, which is the shadow of the overall situation. Therefore, the push-pull signal must be greater than 0·22, which is the minimum for stable tracking. Under these conditions, it can be experimentally confirmed that as long as no error occurs, or even if an error occurs, b/a is 0.35 or less (b/0.35; where b / a is the defect signal locally generated by the influence of the first information layer) The amplitude rb" (the amplitude "b" of the tracking error signal) is the ratio of the amplitude "a" of the transition signal measured during tracking of a portion of the second information layer), and is in the second information layer. During the sequential tracking, recording, and regeneration, no off-track occurs. For recording and reproduction, the absorbance of the intermediate layer to the wavelength of the selected light is preferably small. The material of the intermediate layer is preferably a resin in terms of formability and cost, and examples thereof include a resin curable by ultraviolet rays, a retardation resin, and a thermoplastic resin. A concavo-convex pattern such as a guide groove formed by an injection molding or photopolymer method may be formed on the intermediate layer. The thickness "e" of the intermediate layer is preferably 25 μm to 33 μπι. When the intermediate layer is thinner than 25 μηι, the error signal amplitude "b" becomes larger at the most ideal groove depth due to the influence of the light beam having passed through the first information layer on the second information layer, and b After /a will exceed 0.35. On the other hand, as the intermediate layer becomes thicker than 3 3 μm, the push-pull signal in the second information layer itself becomes less than 0·22 due to aberration. The error signal amplitude "b" also becomes smaller. -14- 200818183 The reflectivity of the first and second information layers is preferably 3.0% to 6.0%, respectively. When the reflectance is less than 3.0%, the information recording and reproducing device cannot perform focusing and tracking. On the other hand, in the phase change optical recording medium, it is difficult to have a reflectance of 6.0% or more. In particular, the first and second information layers cannot together have a reflectance of 6.0% or more. Even if the first information layer or the second information layer is successfully made to have a reflectance of 6.0% or more, the reflectance difference is larger, and focusing cannot be performed well when transferring from the first information layer to the second information layer. The first and second information layers preferably have a reflectance of 3% to 4% together. The single-sided double-layer optical recording medium of the present invention must be recordable and reproducible in a system using a laser beam having a wavelength of 405 nm and an objective lens having a number of apertures NA of 0.65, and allows the user to first and second in the blank. Image and text information is randomly recorded on the information layer. For this purpose, the thickness of the intermediate layer is preferably 25 ± 5 μηη. An example of the problem that occurs in this case includes, as shown in FIG. 4, a portion X of the second information layer corresponding to/from the boundary between the recorded area and the unrecorded area in the first information layer. When the recording/reproduction is performed, the off-track occurs. In Fig. 4, the recorded area is the central portion of the first information layer, and the unrecorded area is the two sides of the first information layer. This is because the PD (optical diode) in the optical pickup-up is reproduced when the second information layer is illuminated by light passing through the boundary between the recorded area and the unrecorded area in the first information layer. ) will receive crosstalk from the first information layer. In other words, in a tracking method called the Differential Push Pull Method (where the incident beam is divided into three beams), when it is adjacent to the main beam located in the groove, it is located in the land part. -15-

200818183 子光束通過邊界時，由劃分爲二之PD所偵測到 之差信號通常爲〇，只要溝槽循軌被成功地執行 說，PD差信號輸出係透過30KHZ之低通濾波器 :當可執行循軌（在溝軌上（on-track ))時， 第5A圖所示之信號；而當偏軌發生時，會獲得$ 所示之循軌誤差信號（執行循軌，以及用於一循 的信號）。然而，當在對應於第一資訊層中之已 未記錄區之間之邊界的第二資訊層之一部份執行 會獲得如第6圖所示之信號。亦即，亦會產生誤 ，如同會產生殘留的誤差。該誤差信號是在光線 資訊層時，由於已記錄區和未記錄區之間的邊界 傳送如串擾之結果並接著發生偏移信號而產生。 此係單純稱爲「誤差信號」。範例中，誤差信號 5B圖中之偏軌時的振幅稱爲「Rpp」。 在該單面雙層記錄媒體中，第一資訊層以滿 光率要件爲佳：非結晶部份Ta的透光率（％ )和 Tc的透光率（％)係滿足以下要件：0&lt;Tc-Ta$6 結晶部份Tc的透光率爲40%〜小於50%。當Tc 時，需要高於標準記錄功率的功率（在此係在磺 測到13 mW)來做爲第二資訊層的記錄功率，主 因而降低。另一方面，就記錄條件而言’大於 是不可能的。Tc仍以42%〜4 5 %爲佳。當Tc大灰 第一資訊層的初始化（結晶化）會不充分，且_ 反射率，進而導致反射不均且透過率實質降低。 的信號間 。具體來 加以監測 會獲得如 :口第5 B圖 環之溝軌 記錄區和 循軌時， 差信號E 通過第一 之資訊係 下文中， 振幅和第 足以下透 丨結晶部份 (% ) •，而 小於4 0 % :片表面量 .記錄感度 5 0 % 的 T c ^45%時， ^法獲得高 -16- 200818183 當Tc和Ta之間的差超過6%時，在第一資 內溝軌被完全記錄至外溝軌之後用於第二資訊層 率，和當第一資訊層未被記錄時用於第二資訊層 率之間，可能會產生1 mW以上的功率差。因此 錄區和未記錄區隨機存在第一資訊層中之狀態下 一資訊層未被記錄時的記錄功率來記錄第二資訊 導致形成品質良好的區域和在記錄感度不良的狀 錄之品質不良的區域。 一般來說，Tc爲42%〜43%，而Ta爲37%' 第一資訊層被記錄時，第二資訊層的記錄功率爲 而在第一資訊層未被記錄時，第二資訊層的記 1 2.5 m W。記錄功率的差相當小，約爲〇 . 5 m W。 本發明可提供可用於隨機記錄的單面雙層光 體，其中即使已記錄區和未記錄區隨機存在第一 ’仍可毫無問題地藉由調整光學記錄媒體的狀態 再生第二資訊層，而無需改變系統。 範例 下文中將配合範例來詳細說明本發明，但以 範例不應限制本發明之範圍。 (範例1 ) 在由聚碳酸酯樹脂所製成且直徑爲12 0111而 爲〇·5 95 mm的第一基板上（其中溝槽深度26 訊層已自 的記錄功 的記錄功 ，在已記 ，若以第 層，其會 態下被記 -38%。當 12 mW， S彔功率爲 學記錄媒 資訊層中 來記錄及 下所示之 平均厚度 im、溝槽 -17- 200818183200818183 When the sub-beam passes the boundary, the difference signal detected by the PD divided into two is usually 〇, as long as the groove tracking is successfully executed, the PD difference signal output is transmitted through the 30KHZ low-pass filter: When performing tracking (on-track), the signal shown in Figure 5A; and when the derailment occurs, the tracking error signal shown in $ is obtained (execution of tracking, and for one) Follow the signal). However, when a portion of the second information layer corresponding to the boundary between the unrecorded areas in the first information layer is executed, a signal as shown in Fig. 6 is obtained. That is, there will be errors as if there are residual errors. The error signal is generated in the ray information layer due to the transmission of the boundary between the recorded area and the unrecorded area as a result of crosstalk and then an offset signal. This is simply called "error signal". In the example, the amplitude of the off-track in the error signal 5B is called "Rpp". In the single-sided two-layer recording medium, the first information layer is preferably a full light rate element: the light transmittance (%) of the amorphous portion Ta and the light transmittance (%) of the Tc satisfy the following requirements: 0 &lt; The light transmittance of the Tc-Ta$6 crystalline portion Tc is 40% to less than 50%. When Tc, the power higher than the standard recording power (here, 13 mW measured in the sulphide) is required as the recording power of the second information layer, which is mainly reduced. On the other hand, 'greater than is impossible in terms of recording conditions. Tc is still preferably 42% to 45%. When Tc ash is initialized (crystallized) of the first information layer, it is insufficient, and _ reflectance, which in turn causes uneven reflection and a substantial decrease in transmittance. Signal between. Specifically, the monitoring will obtain, for example, the groove track recording area of the 5th B-ring of the mouth and the tracking signal, the difference signal E passes through the first information system below, the amplitude and the sufficient amount to pass through the crystallization part (%). , less than 40%: sheet surface amount. When recording the sensitivity of 50% of T c ^ 45%, ^ method obtains high -161818183 when the difference between Tc and Ta exceeds 6%, in the first capital The second information layer rate is used after the groove track is completely recorded to the outer groove track, and between the second information layer rate when the first information layer is not recorded, a power difference of 1 mW or more may be generated. Therefore, the recorded area and the unrecorded area are randomly present in the state of the first information layer, and the recording power when the next information layer is not recorded to record the second information results in the formation of a good quality area and the poor quality of the recorded poorly recorded record. region. In general, Tc is 42% to 43%, and Ta is 37%. When the first information layer is recorded, the recording power of the second information layer is when the first information layer is not recorded, and the second information layer is Record 1 2.5 m W. The difference in recording power is quite small, about 〇 5 m W. The present invention can provide a single-sided double-layer light body which can be used for random recording, wherein even if the first and second unseen areas are randomly present, the second information layer can be reproduced by adjusting the state of the optical recording medium without any problem. There is no need to change the system. EXAMPLES The invention will be described in detail below with reference to examples, but the scope of the invention should not be limited by the examples. (Example 1) On the first substrate made of polycarbonate resin and having a diameter of 12 0111 and 〇·5 95 mm (where the groove depth is 26, the recording work of the recording layer has been recorded, If the first layer is used, it will be recorded as -38%. When 12 mW, the S彔 power is recorded in the information media layer and recorded as the average thickness im, groove -17- 200818183

寬度0·2 μιη、以及軌距0.40 μηι的連續顫動溝槽係形成在 單面上），於Ar氣氛圍中以磁控濺鍍法依序形成厚度44 nm 且含有 ZnS 和 Si02(ZnS: SiO2 = 80: 20(莫耳％)) 的第一下介電保護層、厚度 8.5 nm 且含有 Ag〇.2ln3.5Sb69.8Te22Ge4.5 的第 一^ 記錄層、厚度 15 nm 且含 有 ZnS 和 Si02(ZnS: SiO2 = 80: 20 (莫耳 ％))的第一上 介電保護層、厚度15 nm且含有Ti02的界面層、厚度1〇 nm且含有Ag的半透過反射層、厚度1 5 nm且含有Ti〇2 的光學調整層，以獲得第一資訊層。 同時，在由聚碳酸酯樹脂所製成且直徑爲1 2 cm而平 均厚度爲0.600 mm的第二基板上（其中溝槽深度26 nm 、溝槽寬度0.2 μιη、以及軌距0.40 μιη的連續顫動溝槽係 形成在單面上），於Ar氣氛圍中以磁控濺鍍法依序形成 膜厚度140 nm且含有AgBi ( Bi 0.5質量％)的第二反射 層、厚度 3 nm 且含有 Nb205 和 Zr02(Nb205: ZrO2 = 70: 30 (莫耳％))的第二界面層、厚度21 nm且含有ZnS和 Si〇2 ( ZnS ： SiO2 = 8 0 : 20 (莫耳％ ))的第二上介電保護 層、厚度 15 nm 且含有 Ag〇.2In3.5Sb69.8Te22Ge4.5 的第二記 錄層、厚度 65 nm 且含有 ZnS 和 Si02 ( ZnS : SiO2 = 80 : 2〇 (莫耳％ ))的第二下介電保護層，以獲得第二資訊層 接著，將可由紫外線硬化之樹脂（Nippon Kayaku Co·，Ltd·所生產的KARAYAD DVD 003M)塗佈於光學調 整層的表面，並將其與第二下介電保護層接合，然後從第 -18- 200818183 一基板側照射紫外線，以硬化該可由紫外線硬化之樹脂來 做爲中間層’從而產生具有兩資訊層的單面雙層相變光碟 。該中間層的厚度爲25±3 μιη (從內圓周量測至外圓周） 〇 接下來’以初始化設備自第一基板側照射雷射光束， 並依序初始化第二記錄層和第一記錄層。該初始化是以利 用數値孔徑ΝΑ爲0.55的物鏡，使來自半導體雷射裝置（ 震盪波長爲810zb 10 nm)的雷射光束聚焦於各記錄層上的 方式加以執行。 第二記錄層的初始化條件是使光碟以CLV (恆定線性 速度）模式旋轉、線性速度爲3 m/s、每轉之饋送量爲3 6 μηι/rev.、徑向位置（與旋轉中心的距離）22 mm〜58 mm、 以及初始化功率爲3 5 0 mW。 第一記錄層的初始化條件是使光碟以CLV (恆定線性 速度）模式旋轉、線性速度爲5 m/s、每轉之饋送量爲5 0 μηι/rev·、徑向位置（與旋轉中心的距離）23 mm〜5 8 mm、 以及初始化功率爲5 00 mW。 在形成中間層以獲得雙層光學記錄媒體之前，使用分 光光度計（Steag所製造之ETA-Optik )單獨量測第一資 訊層的透光率：結晶部份的透光率爲42·4%;初始化前之 非晶部份的透光率爲37%。因此，透光率的差爲5.4% ° (範例2〜7 ) 以和範例1相同的方式製備及初始化單面雙層相變光 -19- 200818183 碟，除了中間層的厚度和第二基板的溝槽深度變爲: 的範例2〜7所示之値以外。 在這些光碟中之每一者的第一資訊層中，以 的最短標記長度、6.6 m/ s的記錄線性速度、以及 的記錄功率，藉由ETM ( 8 -1 2調變）調變法，將 案記錄於40 mm〜41 mm之範圍中的徑向位置。 接著，將隨機圖案記錄於第二資訊層中位；( 0 m m〜4 0.5 m m之範圍的徑向位置。 表1顯示爲記錄前之第一資訊層的溝槽信號特 挽信號特性（推挽信號），亦即，在聚焦之光束狀 藉由PD和信號將使PD差信號輸出通過30KHz之 波器所獲得的推挽信號振幅正規化之値，以及缺陷 幅「b」（循軌誤差信號振幅「b」）、躍回信號 」、和比率（b/a )之値。另外，溝槽深度和反射 亦顯示於表1。 • 當在上述條件下，可成功地於上述半徑範圍中 序記錄時，其被評估爲OK，而當進行循序記錄期 偏軌時，其被評估爲NG。接著，在上述範圍中執 循軌，且無偏軌即被評估爲OK，而發生偏軌則被 NG。 這些結果係顯示於表1。當推挽信號爲0.22以 b/a爲〇·35以下時，至少循序記錄被判定爲〇κ。 (比較性範例1〜4 ) 良1中 0.2 μπι 10 mW 隨機圖 ^ 39.5 性之推 態下， 低通濾 信號振 I幅「a 率的値 進行循 間發生 行循序 評估爲 上，且 -20- 200818183 以和範例1相同的方式製備及初始化單面雙層相變光 碟，除了中間層的厚度和第二基板的溝槽深度變爲表1中 的比較性範例1〜4所示之値以外。 這些光碟係以和範例2〜7相同的方式加以記錄和評估 〇 、這些結果係顯示於表1。小於0·22的推挽信號和大於 0.35的b/a會導致Ν〇。A continuous chattering groove with a width of 0·2 μιη and a gauge of 0.40 μηι is formed on one surface), and a thickness of 44 nm is formed by magnetron sputtering in an Ar gas atmosphere and contains ZnS and SiO 2 (ZnS: SiO2). = 80: 20 (mol%)) The first lower dielectric protective layer, the first recording layer with a thickness of 8.5 nm and containing Ag〇.2ln3.5Sb69.8Te22Ge4.5, 15 nm thick and containing ZnS and SiO 2 ( ZnS: SiO2 = 80: 20 (mole %)) of the first upper dielectric protective layer, a thickness of 15 nm and an interface layer containing TiO 2 , a thickness of 1 〇 nm and a semi-transmissive reflective layer containing Ag, and a thickness of 15 nm An optical adjustment layer containing Ti〇2 to obtain a first information layer. At the same time, on a second substrate made of polycarbonate resin and having a diameter of 12 cm and an average thickness of 0.600 mm (with a groove depth of 26 nm, a groove width of 0.2 μm, and a track pitch of 0.40 μm) The trench is formed on one surface, and a second reflective layer having a thickness of 140 nm and containing AgBi (Bi 0.5% by mass), a thickness of 3 nm and containing Nb205 is sequentially formed by magnetron sputtering in an Ar gas atmosphere. Zr02 (Nb205: ZrO2 = 70: 30 (mole%)) of the second interfacial layer, 21 nm thick and containing ZnS and Si〇2 (ZnS: SiO2 = 8 0: 20 (mole %)) on the second Dielectric protective layer, second recording layer with thickness of 15 nm and containing Ag〇.2In3.5Sb69.8Te22Ge4.5, thickness 65 nm and containing ZnS and SiO 2 (ZnS : SiO2 = 80 : 2 〇 (mole % )) a second lower dielectric protective layer to obtain a second information layer, and then a UV-curable resin (KARAYAD DVD 003M manufactured by Nippon Kayaku Co., Ltd.) is applied to the surface of the optical adjustment layer, and is combined with The second lower dielectric protective layer is bonded, and then ultraviolet light is irradiated from a substrate side of -18-200818183 to harden the The ultraviolet curing resin as the intermediate layer 'to produce two single-sided double information layer having a phase change disc. The thickness of the intermediate layer is 25±3 μηη (measured from the inner circumference to the outer circumference) 〇 Next, the laser beam is irradiated from the first substrate side by the initializing device, and the second recording layer and the first recording layer are sequentially initialized. . The initialization is performed by using an objective lens having a number 値 aperture ΝΑ of 0.55 to focus a laser beam from a semiconductor laser device (oscillation wavelength of 810 zb 10 nm) on each recording layer. The second recording layer is initialized by rotating the disc in CLV (constant linear velocity) mode, linear velocity of 3 m/s, feed per revolution of 3 6 μηι/rev., radial position (distance from the center of rotation) ) 22 mm to 58 mm, and initial power of 305 mW. The initialization condition of the first recording layer is to rotate the optical disc in a CLV (constant linear velocity) mode, a linear velocity of 5 m/s, a feed per revolution of 50 μm/rev, and a radial position (distance from the center of rotation) ) 23 mm to 5 8 mm, and initial power of 500 mW. Before forming the intermediate layer to obtain a two-layer optical recording medium, the transmittance of the first information layer was separately measured using a spectrophotometer (ETA-Optik manufactured by Steag): the transmittance of the crystal portion was 42.4%. The transmittance of the amorphous portion before the initialization was 37%. Therefore, the difference in light transmittance was 5.4% (Examples 2 to 7). The single-sided double-layer phase change light -19-200818183 was prepared and initialized in the same manner as in Example 1, except for the thickness of the intermediate layer and the second substrate. The groove depth becomes: Other than the one shown in Examples 2 to 7. In the first information layer of each of these optical discs, the shortest mark length, the recording linear velocity of 6.6 m/s, and the recording power are determined by ETM (8 - 1 2 modulation) modulation method. The case is recorded in a radial position in the range of 40 mm to 41 mm. Next, the random pattern is recorded in the middle of the second information layer; (the radial position in the range of 0 mm to 4 0.5 mm. Table 1 shows the characteristics of the groove signal special pull signal of the first information layer before recording (push-pull) Signal), that is, the amplitude of the push-pull signal obtained by the PD and the signal to cause the PD difference signal to be output through the 30 kHz wave in the focused beam shape, and the defect amplitude "b" (tracking error signal) The amplitude "b"), the transition signal", and the ratio (b/a). In addition, the groove depth and reflection are also shown in Table 1. • Under the above conditions, it can be successfully in the above radius range When recording, it is evaluated as OK, and when the sequential recording period is derailed, it is evaluated as NG. Then, in the above range, the tracking is performed, and the unbiased orbit is evaluated as OK, and the off-track is detected. NG These results are shown in Table 1. When the push-pull signal is 0.22 and b/a is 〇·35 or less, at least the sequential recording is judged as 〇κ (Comparative Example 1 to 4) 0.2 μπι 10 in good 1 mW random graph ^ 39.5 under the state of the state, low-pass filter signal vibration I amplitude "a rate値 Perform a sequential evaluation of the inter-stage, and -20-200818183 Prepare and initialize a single-sided two-layer phase change optical disc in the same manner as in Example 1, except that the thickness of the intermediate layer and the groove depth of the second substrate become The comparisons shown in Comparative Examples 1 to 4 in 1 are recorded and evaluated in the same manner as in Examples 2 to 7. These results are shown in Table 1. Push-pull signals smaller than 0·22 and A b/a greater than 0.35 will cause defects.

-21- 200818183-21- 200818183

循序循軌 饋送 〇 〇 〇 Ο s M：繼 o g g g § § ο 'Ζ Ο Ζ 反射率 (%) m «r； VO cn CN cn (N rn 口 卜 csi rn 00 cn 臟 信號 0.274 0.254 0.286 0.225 0.265 0.330 0.180 1 0.200 0.193 0.323 S I S m f? it U m 救雖 VO (N 3 ^ e 0.256 0.280 0.297 0.312 0.289 0.302 0.351 0.398 0.335 0.414 躍回信號振幅 「a」（mV) (N m m cn 寸 ο ^T) CM 卜 00 CN 卜 Os 〇\ VO 异 寸 CN CN uS m 缺陷信號振幅 「b」（mV) CM 00 00 卜： cn 00 00 vd ίΝ οό 卜： 卜 中間層 (μιη) as 04 VO CN CM cn fO 〇\ CN 9 〇\ (Ν m m cs 範例2 範例3 範例4 範例5 範例6 範例7 比較性 範例1 比較性 範例2 比較性 範例3 比較性 範例4 -22- 200818183 【圖式簡單說明】 第1圖顯示單面之雙層光學記錄媒體的結構範例。 第2圖顯示第一資訊層之結構範例。 第3圖顯示第二資訊層之結構範例。 第4圖顯示第二資訊層之部份X、γ的範例，其對應 於隨機存在第一資訊層中之已記錄區和未記錄區之間之邊 界。 第5A圖顯示在溝軌上時，以推挽法監測第一資訊層 中之邊界中的PD差信號輸出之結果。 第5 B圖顯示在偏軌時，以推挽法監測第一資訊層中 之邊界中的PD差信號輸出之結果。 第6圖顯示在對應於第一資訊層中之邊界的第二資訊 層之部份中執行循軌時，以推挽法監測PD差信號輸出的 結果。 【主要元件符號說明】 1 ··資訊層 2 :中間層 3 :第二資訊層 4:具有溝槽的第一基板 5 :具有溝槽的第二基板 1 1 ··第一下介電保護層 1 2 :第一記錄層 1 3 :第一上介電保護層 -23- 200818183 14:第一硫化防止層 1 5 :半透過反射層 1 6 :光學調整層 1 7 :第二下介電保護層 1 8 :第二記錄層 19 :第二上介電保護層 20 :第二硫化防止層 2 1 :第二反射層Sequential tracking feed 〇〇〇Ο M: Following oggg § § ο 'Ζ Ο 反射 reflectance (%) m «r; VO cn CN cn (N rn mouth csi rn 00 cn dirty signal 0.274 0.254 0.286 0.225 0.265 0.330 0.180 1 0.200 0.193 0.323 SIS mf? it U m rescue VO (N 3 ^ e 0.256 0.280 0.297 0.312 0.289 0.302 0.351 0.398 0.335 0.414 jumpback signal amplitude "a" (mV) (N mm cn inch ο ^ T) CM 00 CN 卜Os 〇\ VO 寸 CN CN uS m Defect signal amplitude "b" (mV) CM 00 00 Bu: cn 00 00 vd Ν οό Bu: Bu intermediate layer (μιη) as 04 VO CN CM cn fO 〇\ CN 9 〇\ (Ν mm cs Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 -22- 200818183 [Simple Description] Figure 1 shows An example of the structure of a single-sided double-layer optical recording medium. Fig. 2 shows an example of the structure of the first information layer. Fig. 3 shows an example of the structure of the second information layer. Fig. 4 shows a part X, γ of the second information layer. An example of a random presence of the first information layer The boundary between the recorded area and the unrecorded area. Figure 5A shows the result of monitoring the output of the PD difference signal in the boundary in the first information layer by push-pull method on the groove track. Figure 5B shows In the off-track, the result of the PD difference signal output in the boundary in the first information layer is monitored by a push-pull method. Figure 6 shows the execution of the second information layer corresponding to the boundary in the first information layer. In the case of the rail, the result of the PD difference signal output is monitored by push-pull method. [Main component symbol description] 1 ··Information layer 2: Intermediate layer 3: Second information layer 4: First substrate 5 having a trench: having a trench Second substrate 1 1 · first lower dielectric protective layer 1 2 : first recording layer 1 3 : first upper dielectric protective layer -23 - 200818183 14: first vulcanization preventing layer 1 5 : semi-transmissive reflective layer 1 6 : optical adjustment layer 1 7 : second lower dielectric protective layer 18 : second recording layer 19 : second upper dielectric protective layer 20 : second vulcanization preventing layer 2 1 : second reflective layer

-24--twenty four-

Claims (1)

200818183 十、申請專利範圍 1. 一種光學記錄媒體，包含： 第一資訊層； 第二資訊層；和 設置於該第一資訊層和該第二資訊 其中該第一資訊層和該第二資訊層 射側加以設置，且該第二資訊層包括第 其中係調整設於該第二基板中之溝 層的厚度，使得於未記錄狀態之該第二 號爲0 · 2 2以上，且在於對應於該第一 區和未記錄區之間的邊界之一部份該第 所測得的躍回信號之振幅「a」和由該 所局部產生的缺陷信號之振幅「b」之 要件： 0 S b/a S 0.35 ° 2. 如申請專利範圍第1項之光學 成用於該第一資訊層和該第二資訊層之 包含 Ag、In、Sb、Te、和 Ge。 層之間的中間層， 係以此順序自光入 二基板，以及 槽的形狀和該中間 資訊層中的推挽信 貧訊層中之已記錄 二資訊層上循軌時 第一資訊層之影響 間的關係滿足以下 記錄媒體，其中構 記錄層材料的元素 -25-200818183 X. Patent application scope 1. An optical recording medium comprising: a first information layer; a second information layer; and a first information layer and the second information, wherein the first information layer and the second information layer The emitter side is disposed, and the second information layer includes a thickness of the trench layer disposed in the second substrate, such that the second number in the unrecorded state is 0 · 2 2 or more, and corresponds to The amplitude of the first measured transition signal "a" and the amplitude of the locally generated defect signal "b" in one of the boundaries between the first zone and the unrecorded zone: 0 S b /a S 0.35 ° 2. The optical material of claim 1 is used for the first information layer and the second information layer comprising Ag, In, Sb, Te, and Ge. The intermediate layer between the layers is self-lighted into the two substrates in this order, and the shape of the groove and the first information layer when tracking on the recorded two information layers in the push-pull layer of the intermediate information layer The relationship between the influences satisfies the following recording medium, in which the elements of the recording layer material are -25-