1307096 九、發明說明： 【發明所屬之技術領域】 本發明係關於-種光資訊儲存媒體，特別關於一種藍 光光碟。 【先前技術】 一般而言，燒錄光資訊儲存媒體所使用之光源波長已 經由640mn〜650腿的紅光雷射進步到4〇5+/_5nm的藍光雷 射，而波長縮短之目的是為了縮小光點來增加記錄密度， 使得光資訊儲存媒體可記錄更多資訊量。 決定光資訊儲存媒體品質優劣關係於有抖動偏差 (Jitter )、反射率（Refiectivity )，以及調制比 (Modulation rate)三個因素。 以藍光光碟（Blue-ray Disc，簡稱仙）而言，規格 書中有制定其抖動偏差值必須低於6. 5%、反射率必須介於 11 %〜24%之間，而調制比必須高於0.4以上。然而，影響 抖動偏差、反射率，以及調制比三個因素，主要又與製作 藍光光碟各層之光學厚度（optical thickness)有關， 其中，光學厚度係為各層厚度與其折射率之乘積。 請參閲圖1，係為一種習知之藍光光碟1，包含一基 板11、一設於基板11上之反射層12、—設於反射層12 上之第一介電層13、^設於第一介電層13上之記錄層 14、一設於記錄層14上之第二介電層15,以及一設於第 二介電層15上之覆蓋層 l3〇7〇96 爻發明係利用制定藍先先碟之第 一介電層、記錄屏、 ’以及tS·層之先學厚度，使得藍先先碟i量 欠、、’° =抖動偏差、調制比，以及反射率皆能符合規 書中所制《之範圍内，希此提高藍 續 寫能力，進而提升藍光光碟之生產品質。 重後讀 【發明内容】1307096 IX. DESCRIPTION OF THE INVENTION: TECHNICAL FIELD OF THE INVENTION The present invention relates to a light information storage medium, and more particularly to a blue light disc. [Prior Art] In general, the wavelength of the light source used for burning the information storage medium has been improved from a red laser of 640mn to 650 legs to a blue laser of 4〇5+/_5nm, and the purpose of shortening the wavelength is to The light spot is reduced to increase the recording density, so that the light information storage medium can record more information. Determining the quality of optical information storage media is related to jitter (Jitter), reflectivity (Refiectivity), and modulation rate. In the case of Blu-ray Disc (Blue-ray Disc), the jitter deviation value must be less than 6.5%, the reflectivity must be between 11% and 24%, and the modulation ratio must be high. Above 0.4. However, the three factors affecting the jitter deviation, the reflectance, and the modulation ratio are mainly related to the optical thickness of each layer of the blue light disc, wherein the optical thickness is the product of the thickness of each layer and its refractive index. Referring to FIG. 1 , a conventional Blu-ray disc 1 includes a substrate 11 , a reflective layer 12 disposed on the substrate 11 , a first dielectric layer 13 disposed on the reflective layer 12 , and a first dielectric layer 13 . a recording layer 14 on a dielectric layer 13, a second dielectric layer 15 disposed on the recording layer 14, and a cover layer 13 〇 7 〇 96 disposed on the second dielectric layer 15 The first dielectric layer, the recording screen, and the thickness of the tS· layer of the blue first disk make the blue first disk first, the '° = jitter deviation, modulation ratio, and reflectivity are all in compliance. Within the scope of the book, it is hoped to improve the ability of blue writing, and thus improve the production quality of Blu-ray discs. Heavy reading [invention content]
二於二課二 緣疋為達上述目的，依本發明之藍光光碟，包含一 基板：-反射層、一第一介電層、一記錄層、一第二介電 層，以及覆蓋層。其中，反射層係設於基板上。第-介 電層係設於反鼾禺u 射曰上，且第一介電層之光學厚度介於15ηπι “與=間。5己錄層係設於第一介電層上，且記錄層之 光子居又；I於15nm至45nm之間。第二介電層係設於記錄 層上’且第―介電層之光學厚度介於75職至19Qnm之間。 覆蓋層係設於第二介電層上。 承上所述，依因本發明之藍光光碟，藉由第一介電 二、己亲a以及第二介電層之光學厚度範圍界定，使得 籃光光碟之量剛結果皆能符合規格書所制定之範圍内，進 而增加藍光光碟之重複讀寫之能力，由此可見，本發明之 藍光光碟確實具有良好之生產品質。 【實施方式】 1307096 以下將參照相關圖式，說明依本發明較佳實施例之藍 光光碟。 請參閱圖2所示，係為本發明之藍光光碟2，本實施 例中，藍光光碟2係為一可重複讀寫式之藍光光碟2 (BD-RW)，其包含一基板21、一反射層22、一第一介電 層23、一記錄層24、一第二介電層25,以及一覆蓋層26。 本實施例中，基板21係由聚碳酸酯（p〇1ycarbonate) 材質所製成’其折射率約為1.45至1.7〇之間’且厚度約 •為1.1mm。另外，基板21更具有複數擺動溝槽（wobbling grooves)，各擺動溝槽之間距（pitch)係為〇.32#m，各 擺動溝槽之振幅（amplitude)係為I5nm，各擺動溝槽之 深度（depth)係為25nm，各擺動溝槽之寬度（Wldth)係 為 160nm。 本實施例中，反射層22係設於基板21上’其材質係 為銀（Ag)，且反射層22厚度係介於9〇nm至160nm之間。 鲁當然，本發明之反射層22之材質可為銀（Ag)、金（Au)、 鉛（Pd)、銦（In)、銅（Cu)、矽（Si)、鍺（Ge)或鉻（Cr) 其中之一或是合金，且反射層22可具有為介於60nm至 200nm間之厚度。 第一介電層23係設於基板21上，且第一介電層23 之光學厚度介於15nm至70nm之間。本實施例中，第一 介電層23係由硫化鋅•二氧化矽（ZnS-Si02)之材質所製 成。此外，本實施例之第一介電層23僅具有單一層體， 當然’第一介電層23亦可設計為具有複數第一介電子層 1307096 之態樣。 記錄層24係設於第一介電層23上，且記錄層24於 結晶下狀態，其光學厚度係介於15nm至45nm之間。記 錄層24係由銀/銦/録/蹄/鍺（Ag/In/Sb/Te/Ge)合金之材質 製成，且具有原子百分比1至7之鍺（Ge)，本實施例中， 記錄層24之銀（Ag):銦（In):銻（Sb):碲（Te):鍺 (Ge)原子百分比係為〇.5 : 5 : 62 : 25 : 4。 第二介電層25係設於記錄層24上，且第二介電層25 •之光學厚度介於75nm至190nm之間。第二介電層25係 由硫化鋅-二氧化矽（ZnS-Si〇2)之材質所製成，其中，第 二介電層25之二氧化矽（Si〇2)含量不超過莫耳百分比 (mole%)50。本實施例中，第二介電層25之硫化鋅（ZnS) 與一氧化石夕（Si〇2)分別占有莫耳百分比（mole% ) 70與 莫耳百分比（m〇le%) 30。 覆蓋層26係設於第二介電層25上，而覆蓋層26之 鲁厚度約為0.1 mm。 接者，我們利用表1所示之貫驗條件，於較低燒錄功 率固定在O.lMw之二階多脈衝燒錄策略（tw〇_ level multipulse writing strategy)，進行界定本發明之藍光光碟2 各層光學厚度之實驗： ' 請參閱表2，實驗組1中，第一介電層之光學厚度係 為29nm、記錄層之光學厚度係為4〇nm、第二介電層ς光 學厚度係為14〇nm ;實驗組2中，第一介電層之光於厚度 係為23nm、記錄層之光學厚度係為32nm、第二介電層2 1307096 光學厚度係為165nm。請參閱表3，量測結果係顯示，實 驗組1之抖動偏差係為5.6%、調制比係為0.54、反射率係 為13%，實驗組2之抖動偏差係為5.5%、調制比係為0.51、 反射率係為15.5%，皆符合規格書所制定之範圍内。此外， 實驗組1之重複讀寫能力係為7500次，而實驗組2之重 複讀寫能力係為9500次。 接著，請比較表2中對照組1至對照組6，各對照組 係分別調整第一介電層、記錄層、或第二介電層之光學厚 • 度。實驗結果則如表3所示之量測數據，各對照組之抖動 偏差、調制比、或反射率係超出規格書所制定之範圍。此 外，對照組1至對照組6之重複讀寫能力係為無法測量或 低於實驗組1或實驗組2之次數。 由此推知，當本發明之藍光光碟2,其第一介電層23 之光學厚度介於15nm至70nm之間、記錄層24之光學厚 度介於15nm至45nm之間，以及第二介電層25之光學厚 ^ 度介於75nm至190nm之間時，藍光光碟2之抖動偏差、 調制比，以及反射率皆符合規格書所制定之範圍内。此 外，根據實驗結果，亦歸納出第一介電層23之較佳光學 厚度係介於25nm至75nm之間、記錄層24之較佳光學厚 度係介於20nm至45nm之間，以及第二介電層25之較佳 光學厚度係介於120nm至180nm之間。 本發明之藍光光碟2,第一介電層23之材質係為硫化 鋅-二氧化矽（ZnS-Si02)，具有折射率約2.1 ;記錄層24 之材質係為銀/銦/銻/碲/鍺（Ag/In/Sb/Te/Ge)合金，具有 1307096 折射率約2·4;第二介電層25之材質係為硫化鋅-二氧化矽 (ZnS-Si02)，具有折射率約為2.1。當第一介電層23之厚 度介於6nm至34nm之間、較佳厚度介於10nm至20nm 之間；記錄層24之厚度介於6nm至18nm、較佳厚度介於 10nm至17nm之間；第二介電層25之厚度介於35nm至 91nm之間、較佳厚度介於50nm至80nm之間時，則滿足 上述實驗所界定之光學厚度範圍。 承上所述，依因本發明之藍光光碟，藉由第一介電 • 層、記錄層，以及第二介電層之光學厚度範圍界定，使得 藍光光碟之量測結果皆能符合規格書所制定之範圍内，進 而增加藍光光碟之重複讀寫之能力，由此可見，本發明之 藍光光碟確實具有良好之生產品質。 以上所述僅為舉例性，而非為限制性者。任何未脫離 本發明之精神與範疇，而對其進行之等效修改或變更，均 應包含於後附之申請專利範圍中。 【圖式簡單說明】 圖1係為習知之藍光光碟； 圖2係為本發明之藍光光碟示意圖； 表1係本發明進行光學厚度範圍測量所使用之條件與 方法； 表2為一實驗數據，顯示具有不同光學厚度之藍光光 碟；以及 表3係為一實驗結果，顯示表2之各藍光光碟之量測 10 1307096In the second aspect of the present invention, a Blu-ray disc according to the present invention comprises a substrate: a reflective layer, a first dielectric layer, a recording layer, a second dielectric layer, and a cover layer. The reflective layer is disposed on the substrate. The first dielectric layer is disposed on the reverse 鼾禺 , and the optical thickness of the first dielectric layer is between 15 ηπι “ and =1. The 5 recording layer is disposed on the first dielectric layer, and the recording layer The photon is again; I is between 15 nm and 45 nm. The second dielectric layer is disposed on the recording layer 'and the optical thickness of the first dielectric layer is between 75 and 19 Qnm. The cover layer is set at the second According to the above, according to the blue light disc of the present invention, by the optical thickness range of the first dielectric second, the parent a and the second dielectric layer, the amount of the optical disc is just the result It can meet the requirements of the specification and increase the ability of the Blu-ray disc to be read and written repeatedly. It can be seen that the Blu-ray disc of the present invention has a good production quality. [Embodiment] 1307096 The following description will be made with reference to the related drawings. A Blu-ray disc according to a preferred embodiment of the present invention. Referring to FIG. 2, it is a Blu-ray disc 2 of the present invention. In this embodiment, the Blu-ray disc 2 is a re-readable Blu-ray disc 2 (BD- RW), comprising a substrate 21, a reflective layer 22, a first dielectric layer 23, The recording layer 24, a second dielectric layer 25, and a cover layer 26. In this embodiment, the substrate 21 is made of a polycarbonate material having a refractive index of about 1.45 to 1.7 Å. The thickness of the substrate is about 1.1 mm. In addition, the substrate 21 has a plurality of wobbling grooves, and the pitch of each of the wobble grooves is 〇.32#m, and the amplitude of each wobble groove (amplitude) The thickness of each of the wobble grooves is 25 nm, and the width of each wobble groove (Wldth) is 160 nm. In this embodiment, the reflective layer 22 is provided on the substrate 21 Silver (Ag), and the thickness of the reflective layer 22 is between 9 〇 nm and 160 nm. Of course, the reflective layer 22 of the present invention may be made of silver (Ag), gold (Au), lead (Pd), or indium. One of (In), copper (Cu), bismuth (Si), germanium (Ge) or chromium (Cr) or an alloy, and the reflective layer 22 may have a thickness of between 60 nm and 200 nm. The layer 23 is disposed on the substrate 21, and the optical thickness of the first dielectric layer 23 is between 15 nm and 70 nm. In this embodiment, the first dielectric layer 23 is made of zinc sulfide. The first dielectric layer 23 of the present embodiment has only a single layer body. Of course, the first dielectric layer 23 can also be designed to have a plurality of first dielectric layers. The recording layer 24 is disposed on the first dielectric layer 23, and the recording layer 24 is in a state of being crystallized, and the optical thickness thereof is between 15 nm and 45 nm. The recording layer 24 is made of silver/indium/recorded. Made of a material of hoof/锗 (Ag/In/Sb/Te/Ge) alloy and having an atomic percentage of 1 to 7 (Ge). In this embodiment, silver (Ag) of recording layer 24: indium ( In): 锑 (Sb): 碲 (Te): 锗 (Ge) atomic percentage is 〇. 5 : 5 : 62 : 25 : 4. The second dielectric layer 25 is disposed on the recording layer 24, and the optical thickness of the second dielectric layer 25 is between 75 nm and 190 nm. The second dielectric layer 25 is made of a material of zinc sulfide-cerium oxide (ZnS-Si〇2), wherein the content of the cerium oxide (Si〇2) of the second dielectric layer 25 does not exceed the molar percentage (mole%) 50. In this embodiment, the zinc sulfide (ZnS) and the nitric oxide (Si〇2) of the second dielectric layer 25 occupy a mole percentage (mole%) 70 and a mole percentage (m〇le%) 30, respectively. The cover layer 26 is disposed on the second dielectric layer 25, and the cover layer 26 has a thickness of about 0.1 mm. In addition, we use the continuity conditions shown in Table 1 to define the Blu-ray Disc 2 of the present invention in a second-order multi-pulse writing strategy with a lower burning power fixed at O.lMw. Experiment of optical thickness of each layer: 'Please refer to Table 2, in the experimental group 1, the optical thickness of the first dielectric layer is 29 nm, the optical thickness of the recording layer is 4 〇 nm, and the optical thickness of the second dielectric layer is 14 〇 nm; in the experimental group 2, the light of the first dielectric layer was 23 nm, the optical thickness of the recording layer was 32 nm, and the optical thickness of the second dielectric layer 2 1307096 was 165 nm. Please refer to Table 3. The measurement results show that the jitter deviation of the experimental group 1 is 5.6%, the modulation ratio is 0.54, the reflectance is 13%, and the jitter of the experimental group 2 is 5.5%. The modulation ratio is 0.51, the reflectance is 15.5%, which is within the scope of the specification. In addition, the repetitive literacy ability of the experimental group 1 was 7,500, and the re-reading ability of the experimental group 2 was 9,500. Next, compare the control group 1 to the control group 6 in Table 2, and adjust the optical thickness of the first dielectric layer, the recording layer, or the second dielectric layer for each of the control groups. The experimental results are as shown in Table 3. The jitter, modulation ratio, or reflectance of each control group is outside the scope of the specification. Further, the repetitive literacy ability of the control group 1 to the control group 6 was the number of times that the measurement group 1 or the experiment group 2 could not be measured or was lower. It is thus inferred that when the Blu-ray disc 2 of the present invention has an optical thickness of the first dielectric layer 23 of between 15 nm and 70 nm, the optical thickness of the recording layer 24 is between 15 nm and 45 nm, and the second dielectric layer When the optical thickness of 25 is between 75 nm and 190 nm, the jitter deviation, modulation ratio, and reflectance of the Blu-ray Disc 2 are within the range defined by the specification. In addition, according to the experimental results, it is also concluded that the preferred optical thickness of the first dielectric layer 23 is between 25 nm and 75 nm, the preferred optical thickness of the recording layer 24 is between 20 nm and 45 nm, and the second The preferred optical thickness of the electrical layer 25 is between 120 nm and 180 nm. In the blue light disc 2 of the present invention, the material of the first dielectric layer 23 is zinc sulfide-cerium oxide (ZnS-SiO2) having a refractive index of about 2.1; the material of the recording layer 24 is silver/indium/锑/碲/ An anthracene (Ag/In/Sb/Te/Ge) alloy having a refractive index of about 1,400 with a refractive index of about 1,047,067; the second dielectric layer 25 is made of zinc sulfide-cerium oxide (ZnS-SiO 2 ) having a refractive index of about 2.1. When the thickness of the first dielectric layer 23 is between 6 nm and 34 nm, preferably between 10 nm and 20 nm; the thickness of the recording layer 24 is between 6 nm and 18 nm, preferably between 10 nm and 17 nm; When the thickness of the second dielectric layer 25 is between 35 nm and 91 nm, and preferably between 50 nm and 80 nm, the optical thickness range defined by the above experiment is satisfied. According to the above, the Blu-ray disc of the present invention is defined by the optical thickness range of the first dielectric layer, the recording layer, and the second dielectric layer, so that the measurement results of the Blu-ray disc can conform to the specification book. Within the scope of the development, thereby increasing the ability of the Blu-ray disc to be repeatedly read and written, it can be seen that the Blu-ray disc of the present invention does have good production quality. The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the present invention are intended to be included in the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a conventional Blu-ray disc; FIG. 2 is a schematic view of a Blu-ray disc of the present invention; Table 1 is a condition and method for measuring optical thickness range of the present invention; Table 2 is an experimental data. Displaying Blu-ray discs with different optical thicknesses; and Table 3 is an experimental result showing the measurement of each Blu-ray disc of Table 2 10 1307096
結果 〇 元件符號說明： 1 藍光光碟 11 基板 12 反射層 13 第一介電層 14 記錄層 15 第二介電層 16 覆蓋層 2 藍光光碟 21 基板 22 反射層 23 第一介電層 24 記錄層 25 第二介電層 26 覆蓋層Results 〇 Component Symbol Description: 1 Blu-ray Disc 11 Substrate 12 Reflective Layer 13 First Dielectric Layer 14 Recording Layer 15 Second Dielectric Layer 16 Cover Layer 2 Blu-ray Disc 21 Substrate 22 Reflecting Layer 23 First Dielectric Layer 24 Recording Layer 25 Second dielectric layer 26 cover layer