577057 經濟部智慧財產局員工消費合作社印製 A7 B7五、發明説明（ί 發明所屬之技術領域 本發明係關於因應供記錄的資料，在光記錄媒體之記 錄層形成複數種類的記錄標記，而多等級記錄資訊之光記 錄方法以及光記錄裝置。 先行技術 相對於如從前的光記錄媒體，藉由多階段改變再生訊 號的長度（反射訊號調變部之長度）而記錄資料的方法， 藉由多階段切換再生訊號的深度（反射訊號的調變度）而 在相同長度的各訊號記錄複數資料的方法已有相當多的硏 究在進行。 根據此光記錄方法，與單純隨著位元之有無而記錄2 値資料的場合相比較，因爲可以在深度方向記錄複數資 料，所以可以增加一定長度下所可以容納的訊號量，亦 即，可以提高線記錄密度。現在，該種記錄媒體，已有利 用全像攝影術者或是使記錄層多層化者被提出。 又，在此把記錄反射訊號的調變度相互不同的複數種 類的記錄資料稱爲多等級（multi-level)記錄。 另一方面，關於這些多等級記錄之光記錄方法，隨著 記錄時之雷射光束的功率變大，亦即隨著形成的反射訊號 的深度變深，會有再生時的訊號品質劣化的問題。其理由 現在還不淸楚。 例如，利用從前的手法而想要記錄媒體的記錄資訊量 的高密度化而使記錄標記縮短，其中，多段切換雷射光束 本紙張尺度適用中gl國家標準（CNS ) A4規格（210X297公釐） (請先閱讀背面之注意事項再填寫本頁) 裝·577057 Printed by A7, B7, Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the Invention (Technical Field to which the Invention belongs The invention relates to the formation of plural types of recording marks on the recording layer of an optical recording medium in accordance with the data for recording, Optical recording method for level recording information and optical recording device. Prior art is a method of recording data by changing the length of a reproduction signal (the length of a reflection signal modulation section) in multiple stages compared to the previous optical recording medium. The method of switching the depth of the reproduced signal (modulation of the reflected signal) in stages and recording multiple data in each signal of the same length has been considerably studied. According to this optical recording method, it is not the same as simply with the presence or absence of bits. Compared with the case of recording 22 data, because plural data can be recorded in the depth direction, the amount of signals that can be accommodated at a certain length can be increased, that is, the line recording density can be increased. Now, such recording media have been The use of holographers or the multilayering of recording layers has been proposed. A plurality of types of recording materials whose modulation levels of radio signals are different from each other are called multi-level recordings. On the other hand, with regard to the optical recording methods of these multi-level recordings, as the power of the laser beam during recording changes, Large, that is, as the depth of the formed reflection signal becomes deeper, there is a problem that the quality of the signal is deteriorated during reproduction. The reason is not yet clear. For example, the amount of information recorded on the recording medium using the previous method High-density shortens the recording marks. Among them, the multi-segment switching laser beam is applicable to the national standard (CNS) A4 specification (210X297 mm) of this paper (please read the precautions on the back before filling this page).
、1T _ 4 577057 A7 B7 經濟部智慧財產局員工消費合作社印製 五、發明説明（j 的功率而進行多等級記錄的場合，其訊號的劣化變得相當 顯著。總之，若要採用多等級記錄的話，記錄標記的高密 度化會變得困難，而有陷於無法相容的問題點。 此外，從前的階段性切換雷射光束的功率而進行多等 級記錄的光記錄方法的思想，記錄標記長度係以比記錄時 的聚光光束的直徑還要大爲前提。總之，多階段調變記錄 標記自身的光反射率，藉由直接讀取該反射率而實現多等 級記錄。 一般而言，聚光光束的直徑，係以Κ λ /ΝΑ ( K :常 數、λ :雷射波長、ΝΑ :透鏡的開口數）來表示。CD所利 用的光讀取頭，其λ = 780nm、NA=0.45爲一般常見値，聚 光光束的直徑約爲1.6 // m。在此場合，使記錄標記長成爲 1.6 // m附近的話，上述的訊號劣化問題變得顯著，要進行 5階段以上的多等級記錄是困難的。 以上的問題，雖認爲是雷射光束的功率設定、記錄媒 體的特性等所有要素之複雜關係的綜合結果，但據本案發 明人所知，其原因現在仍不明朗，高密度的多等級記錄連 同其方法實際上現在仍未被達成。 發明槪要 本發明係有鑑於上述問題而發明者，目的在於提案新 的多等級記錄手法，達成高密度的多等級記錄。 本案發明人，針對光記錄手法，經過銳意硏究的結 果，發現可以多階段記錄的記錄方法以及記錄裝置，且已 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） (請先閲讀背面之注意事項再填寫本頁) 裝· 訂 -5- 577057 A7 B7 五、發明説明（i 確認據此可以在光記錄媒體上進行5階段以上的高密度多 等級記錄。 亦即，藉由以下之本發明可以達成上述目的。 (1 )對光記錄媒體之記錄層，照射藉由照射光學系而 聚光之雷射光束，藉由該雷射光束在前述記錄層形成記錄 標記而記錄資訊的光記錄方法，其特徵爲：於前述記錄層 之與雷射光束之相對移動方向上，連續規定該移動方向之 任意單位長度以及與該移動方向直角相交的方向上之任意 單位寬幅所構成的複數假想記錄胞（cell)，以抑制前述雷射 光束之對前述記錄層之入射角的變動的方式，控制至少前 述照射光學系的角度，以5個階段以上控制照射時間或者 照射功率之至少一方而照射雷射光束，在前述假想記錄胞 形成大小不同的5種類以上的記錄標記， 根據對前述假想記錄胞之前述記錄標記之佔有率，使 前述假想記錄胞全體之光反射率可以調變5個階段以上而 多等級記錄資訊。 (2 )以使前述雷射光束之對前述記錄層之入射角，納 入指定的範圍內的方式控制至少前述照射光學系的角度之 光記錄方法。 (3 )對被設定前述複數之假想記錄胞的前述記錄層之 一部分區域，在照射前述雷射光束時，至少控制前述照射 光學系的角度之光記錄方法。 (4 )具備：輸出雷射光束的雷射，及可以控制該雷射 的照射控制裝置，及聚光前述雷射光束之照射光學系，及 本紙張尺度適用中國國家標準（CNS ) A4規格（210 X297公釐） 0¾ (請先閱讀背面之注意事項再填寫本頁) -一口1T _ 4 577057 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. The invention description (j's power for multi-level recording, the signal degradation becomes quite significant. In short, if multi-level recording is to be used In this case, it becomes difficult to increase the density of recording marks, and there is a problem of incompatibility. In addition, the idea of the optical recording method of multi-level recording in which the power of the laser beam is switched in stages is used to record the mark length The premise is that it is larger than the diameter of the condensing beam during recording. In short, the multi-stage modulation of the optical reflectance of the recording mark itself can achieve multi-level recording by directly reading the reflectance. Generally speaking, condensing The diameter of the light beam is represented by κ λ / ΝΑ (K: constant, λ: laser wavelength, NA: number of lens openings). The optical read head used by CD, whose λ = 780nm and NA = 0.45 are Generally, the diameter of the condensing beam is about 1.6 // m. In this case, if the record mark length is near 1.6 // m, the above-mentioned signal degradation problem becomes significant. Hierarchical recording is difficult. Although the above problem is considered to be the comprehensive result of the complex relationship of all the factors such as the power setting of the laser beam and the characteristics of the recording medium, the cause of the present inventor's knowledge is still unclear, The high-density multi-level recording and its method have not yet been achieved in practice. SUMMARY OF THE INVENTION The present invention was invented in view of the above problems, and the purpose is to propose a new multi-level recording method to achieve a high-density multi-level recording. The inventor, for the light recording method, after careful research, found that the recording method and recording device that can record in multiple stages, and this paper size has been applied to the Chinese National Standard (CNS) A4 specification (210X297 mm) (Please read first Note on the back page, please fill in this page) Binding -5-577057 A7 B7 V. Description of the invention (i confirms that high-density multi-level recording of more than 5 stages can be performed on the optical recording medium. That is, by the following The present invention can achieve the above-mentioned object. (1) A recording layer of an optical recording medium is irradiated with a laser beam focused by irradiating an optical system Beam, an optical recording method for recording information by forming a recording mark on the recording layer with the laser beam, characterized in that: in the relative movement direction of the recording layer and the laser beam, an arbitrary unit of the movement direction is continuously specified A plurality of imaginary recording cells composed of a length and an arbitrary unit width in a direction that intersects the moving direction at right angles, and at least the irradiation is controlled in such a manner as to suppress the variation of the incident angle of the laser beam to the recording layer From the angle of the optical system, the laser beam is irradiated by controlling at least one of the irradiation time or irradiation power in five stages or more, and forming five or more types of recording marks with different sizes on the imaginary recording cell. The occupancy rate of the marks enables the light reflectance of the entire imaginary recording cell to be adjusted in more than 5 stages and to record information at multiple levels. (2) An optical recording method in which at least the angle of the irradiation optical system is controlled so that the incident angle of the laser beam to the recording layer falls within a specified range. (3) A light recording method of controlling at least the angle of the irradiation optical system when irradiating the laser beam to a part of the recording layer in which the plurality of virtual recording cells are set. (4) Equipped with: a laser that outputs a laser beam, an irradiation control device that can control the laser, and an irradiation optical system for condensing the aforementioned laser beam, and this paper size applies the Chinese National Standard (CNS) A4 specification ( 210 X297 mm) 0¾ (please read the precautions on the back before filling this page)-one bite
經濟部智慧財產局員工消費合作社印製 -6 - 577057 經濟部智慧財產局員工消費合作社印製 A7 ____ B7 _五、發明説明（j 定位至少前述雷射以及前述照射光學系的位置可以在前述 記錄層之指定位置照射前述雷射光束之伺服機構；藉由雷 射光束照射而在前述記錄層形成記錄標記可以記錄資訊之 光記錄裝置，其特徵爲：前述照射控制裝置，係於前述記 錄層之與雷射光束之相對移動方向上，連續規定該移動方 向之任意單位長度以及與該移動方向直角相交的方向上之 任意單位寬幅所構成的複數假想記錄胞，同時，可以5個 階段以上變化控制照射時間或者照射功率之至少一方而對 前述假想記錄胞照射雷射光束，前述伺服機構，係具備： 可以計測前述記錄層之前述假想記錄胞的彎曲量之彎曲感 測器，及以追隨該彎曲量的方式傾斜控制至少前述照射光 學系，抑制前述雷射光束之對前述記錄層的入射角變動的 傾斜機構部，藉由前述雷射光束在前述假想記錄胞形成大 小不同的5種類以上的記錄標記，根據對前述假想記錄胞 之前述記錄標記之佔有率，使前述假想記錄胞全體之光反 射率可以調變5個階段以上而多等級記錄資訊。 (5 )前述伺服機構之前述傾斜機構部，以使前述雷射 光束之對前述記錄層的入射角納於指定範圍內的方式傾斜 控制前述照射光學系之光記錄裝置。 (6 )前述伺服機構之前述傾斜機構部，在對被規定前 述假想記錄胞的前述記錄層的一部份區域照射雷射光時， 傾斜控制前述照射光學系之光記錄裝置。 本案發明人，發現可以藉由對假想記錄胞之記錄標記 得佔有比率此一新的調變方法，進行多等級記錄。結果， 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公 (請先閲讀背面之注意事項再填寫本頁) 577057 經濟部智慧財產局員工消費合作社印製 A7 B7五、發明説明（9 可以飛躍提升記錄密度。 但是，已知僅藉由單純調變照射時間或者照射功率而 形成記錄標記，會有無法確實讀取該記錄標記的問題。 其理由之一，係本記錄方式必須要以高精度控制假想 記錄胞全體的光反射率。根據本案發明人的詳細檢討，與 從前的2値記錄比較，多等級記錄容易受到光記錄媒體彎 曲的影響，而推測其爲提高錯誤發生率的原因之一。 特別是照射光學系之物鏡開口數爲NA、雷射光束的波 長爲λ、假想記錄胞的單位長被設定爲比〇·65χ ( λ /NA ) 還小時，假設包含比光束點還小的記錄標記的場合，光束 點的中心’被要求盡可能正確地通過連續被規定的複數假 想記錄胞的中心線上。其理由係在照射強度成高斯分佈的 雷射光點的場合，由其中心開始徐徐形成記錄標記。 在此場合，照射光學系（例如物鏡）的光軸對記錄面 之垂線如不總是維持一定關係的話會產生波面收差（主要 爲coma收差、非點收差），雷射光束的聚光變得不夠充 分，甚且雷射光點的中心還會偏離假想記錄胞的中心。亦 即’記錄標記的位置以及大小產生誤差，要如預定値來設 定對假想記錄胞之記錄標記的佔有率變得有困難，對假想 記錄胞全體之光反射率造成很大的影響。 要解決這些問題，以提高光記錄媒體之機械精度、亦 即使彎曲量或者變動量、偏折角收容於指定的範圍內的方 式製作光記錄媒體亦被考慮。根據本案發明人的實驗，例 如把CD形式的光記錄媒體固定於彎曲變動測定機，光記錄 本紙張尺度適用中國國家標準（CNS ) A4規格（210 X297公釐） (請先閱讀背面之注意事項再填寫本頁) 裝· 訂 -8- 577057 經濟部智慧財產局員工消費合作社印製 A7 一 _ B7五、發明説明（S 媒體平面（直徑45mm至118mm的範圍內）之面垂直方向 的最大變位量（正側）或最小變位値（負側）之某一，對 基準面（由chacking基準面朝向記錄面側之軸方向（上 方）1.2mm的位置處之理想面）如果在土 〇.3mm的範圍內的 話確認可以進行良好的記錄（參照CD— D A規格書6.1 )。 進而，以上述方法測定時之振幅（光記錄媒體旋轉一 週時，上述媒體平面的面垂直方向之最大振幅）在4mm以 下，亦即，以位於此振幅中間的假想平均面爲基準，如果 一方向之振動量在± 0.2mm以下的話確認可以進行良好的記 錄，（參照CD—DA規格書6·2·)。 此外，將光記錄媒體固定於曲振測定機，光記錄媒體 與基準面（由chacking基準面朝上方1.2mm的位置處之理 想面）之夾角在直徑45mm至118mm的範圍內，如果在0.4 度以下則確認可以進行良好的記錄（參照CD— D A規格書 6.3.)。 但是，如此般要做成所有的光記錄媒體，會對工程造 成很大的負擔，而有製造成本大增的可能性。 在此，本案發明人，針對記錄再生方法來加以改良， 嘗試進行良好的記錄再生。 在本發明，於形成記錄標記時，因爲使雷射光束追隨 記錄層的彎曲，所以可以抑制雷射光束的入射角的變動， 於假想記錄胞之上述中心線上可以正確地形成記錄標記。 結果，記錄層的彎曲所導致的假想記錄胞的光反射率誤差 被抑制，達成錯誤比率很少的多等級記錄。又，雷射光束 (請先閲讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） -9- 577057 經濟部智慧財產局員工消費合作社印製 A 7 _____B7__五、發明説明（） 的光軸不限定於對上述記錄層成爲垂直的場合，本發明也 包含與該垂線保持一定的角度差的狀態被最佳化的場合。 以上所述，於5階段以上調變光反射率而記錄資訊的 場合，（與5階段以下的段數的場合比較）確認其特別顯 著而有用。又，此入射角控制，不限於橫亙光記錄媒體全 區域而實施的場合，本發明也包含限定於該光記錄媒體之 特定區域（例如容易產生彎曲的區域）而實施的場合（參 照發明（3 ) 、（ 6 )等）。 較佳之實施型態 以下參照圖面詳細說明本發明之實施型態之例。 使用於本發明之實施型態之例之光記錄媒體（碟片） 10，係於記錄層12使用色素材料之CD—R，或者使用相變 化材料之CD— RW。CD— R的場合，例如包含由透明基材 所構成的基板14、覆蓋被形成於此基板14的一方之面（第 1圖之上面）之雷射光束導引用之溝16而塗布之色素所構 成之前述記錄層12，及在此記錄層12之上側藉由濺鍍等形 成的金或者銀之反射膜1 8，及覆蓋此反射膜1 8的外側之保 護層20等而形成的。CD— RW的場合，例如覆蓋溝16，含 有至少藉由成膜而形成的下部保護層（介電體層），由相 變化材料所構成的記錄層，上部保護層（介電體層），光 反射層，進而還包含覆蓋此之保護層20而形成。 使用於前述記錄層12的色素，一般爲花青色素、部花 青色素、次甲基系色素及其誘導體、苯磺酸金屬錯合物， 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） (請先閲讀背面之注意事項再填寫本頁) -10- 577057 經濟部智慧財產局員工消費合作社印製 A7 _ B7__五、發明説明（S (酉太）菁色素、（艸奈）（酉太）菁色素、偶氮色素等 之有機色素，相變化材料的場合以GeSbTe系、AglnSbTe系 等爲一般。 對前述光記錄媒體10之多等級記錄，藉由第2圖所示 之光記錄裝置30來實彳了。 此光記錄裝置30係CD-R/RW記錄器，介由主軸伺服機 3 1藉由主軸馬達32使光記錄媒體（碟片）10以線速度一 定的條件旋轉驅動，藉由來自雷射3 6的雷射光束在光記錄 媒體（碟片）10記錄資訊。 雷射驅動器（照射控制裝置）38，因應應該記錄的資 訊，控制相當於1個第1圖所示的假想記錄胞（稍後詳 述）40的雷射光束的照射時間，例如輸入至前述雷射36的 雷射脈衝數。 第2圖之符號42，係包含物鏡42A、半反射鏡42B、受 光用物鏡42D、受光器FD之照射光學系。物鏡42A，以雷 射光束聚光於碟片10的記錄層12的方式藉由對焦追蹤伺 服器44來控制。 由光記錄媒體10反射之反射光，藉由半反射鏡42B約 略直角地反射而介由受光用物鏡42D入射至受光器FD，而 作爲多等級訊號來讀取。此照射光學系42全體，藉由伺服 機構4 2來定位。 伺服機構42，具備：給送伺服機構部46、傾斜伺服機 構部47A、以及彎曲感測器42B。給送伺服機構部46，使照 射光學系42同步於光記錄媒體10的旋轉同時由內側向外 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐) (請先閲讀背面之注意事項再填寫本頁)Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs-6-577057 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 ____ B7 _ V. Description of the invention (j Positioning at least the aforementioned laser and the position of the aforementioned optical system can be recorded in the aforementioned record A servo mechanism that irradiates the aforementioned laser beam at a designated position of the layer; an optical recording device capable of recording information by forming a recording mark on the recording layer by irradiation with the laser beam is characterized in that the aforementioned irradiation control device is located in the aforementioned recording layer In the direction of relative movement with the laser beam, a plurality of imaginary record cells composed of an arbitrary unit length of the movement direction and an arbitrary unit width in a direction that intersects the movement direction at right angles can be continuously changed, and can be changed in more than 5 stages. Controlling at least one of irradiation time or irradiation power to irradiate the virtual recording cell with a laser beam, the servo mechanism is provided with: a bending sensor capable of measuring a bending amount of the virtual recording cell of the recording layer, and following the Way of bending amount Tilt control at least the aforementioned irradiation optical system to suppress The tilt mechanism of the laser beam with respect to the incident angle of the recording layer changes, by the laser beam, to form five or more types of recording marks having different sizes on the virtual recording cell, and based on the recording marks on the virtual recording cell. The occupancy ratio allows the light reflectance of the entire imaginary recording cell to be adjusted in more than 5 stages and to record information at multiple levels. (5) The tilt mechanism portion of the servo mechanism, so that the laser beam is directed to the recording layer. The optical recording device of the illumination optical system is tiltedly controlled so that the incident angle of the laser beam falls within a specified range. (6) The tilting mechanism section of the servo mechanism occupies a part of the recording layer where the virtual recording cell is defined. When the laser light is irradiated, the aforementioned optical recording device of the irradiating optical system is tilted controlled. The inventor of the case has discovered that a new modulation method can be used to perform a multi-level recording by using a new modulation method for the recording mark of an imaginary recording cell. As a result, this Paper size applies Chinese National Standard (CNS) A4 specification (210X297) (Please read the precautions on the back before filling This page) 577057 Printed by A7 B7, Consumer Cooperatives, Intellectual Property Bureau, Ministry of Economic Affairs, 5. Description of Invention (9 can greatly increase the recording density. However, it is known that recording marks can be formed only by simply adjusting the irradiation time or irradiation power. The problem of not being able to read this record mark. One of the reasons is that this recording method must control the light reflectance of the entire imaginary record cell with high accuracy. According to the detailed review by the inventor of this case, compared with the previous 2 値 record, Multilevel recording is easily affected by the curvature of the optical recording medium, and it is presumed to be one of the reasons for increasing the error rate. In particular, the number of objective lens openings in the optical system is NA, the wavelength of the laser beam is λ, and the unit of the virtual recording cell is The length is set to be smaller than 0 · 65χ (λ / NA). If it is assumed that a recording mark smaller than the beam spot is included, the center of the beam spot is required to be recorded as accurately as possible through a plurality of consecutive predetermined imaginary cells. Centerline. The reason is that in the case of laser light spots with a Gaussian distribution of irradiation intensity, recording marks are gradually formed from the center. In this case, if the vertical axis of the optical axis of the illuminating optical system (such as the objective lens) to the recording surface does not always maintain a certain relationship, wavefront aberration (mainly coma aberration, non-point aberration) will occur, and the laser beam will be concentrated. The light becomes insufficient, and even the center of the laser spot will deviate from the center of the imaginary recording cell. In other words, there is an error in the position and size of the recording mark. It is difficult to set the occupancy rate of the recording mark of the hypothetical recording cell as planned, and it has a great influence on the light reflectance of the entire hypothetical recording cell. To solve these problems, it is considered to make the optical recording medium in such a manner that the mechanical accuracy of the optical recording medium is improved, and even if the amount of bending or fluctuation, and the deflection angle are contained within a specified range. According to the experiments of the inventor of this case, for example, the optical recording medium in the form of CD is fixed to the bending tester. The size of the optical recording paper is applicable to China National Standard (CNS) A4 (210 X297 mm) (Please read the precautions on the back first) (Fill in this page again.) Binding-8-8577577 Printed by A7 of the Intellectual Property Bureau of the Ministry of Economic Affairs and Consumer Cooperatives. A_B7 V. Description of invention (S media plane (within 45mm to 118mm in diameter). Either the displacement (positive side) or the smallest displacement (negative side), the reference plane (the ideal plane at a position of 1.2 mm from the chacking reference plane toward the recording plane side (upward)) is in the soil. Within the range of .3mm, it is confirmed that good recording can be performed (refer to CD-DA Specification Book 6.1). Furthermore, the amplitude when measured by the above method (the maximum amplitude in the vertical direction of the plane of the media when the optical recording medium is rotated once) Below 4mm, that is, based on the imaginary average plane in the middle of this amplitude, if the amount of vibration in one direction is less than ± 0.2mm, it can be confirmed that it can be well recorded. (Refer to CD-DA Specification Book 6 · 2 ·.) In addition, fix the optical recording medium to the vibration measuring machine, the optical recording medium and the reference surface (the ideal surface at 1.2mm upward from the chacking reference surface). The included angle is in the range of 45mm to 118mm in diameter. If it is below 0.4 degrees, it is confirmed that good recording can be performed (refer to CD-DA specification 6.3.). However, it is necessary to make all optical recording media in this way, which will cause engineering problems. A large burden may cause a large increase in manufacturing cost. Here, the inventor of the present invention has improved the recording and reproduction method and tried to perform good recording and reproduction. In the present invention, when the recording mark is formed, the The radiation beam follows the curvature of the recording layer, so the variation of the incident angle of the laser beam can be suppressed, and a recording mark can be accurately formed on the above-mentioned center line of the hypothetical recording cell. As a result, the light reflection of the hypothetical recording cell caused by the curvature of the recording layer The rate error is suppressed, and a multi-level record with few error ratios is achieved. Also, the laser beam (please read the precautions on the back before filling this page) The scale is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) -9- 577057 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A 7 _____B7__ V. The optical axis of the description of the invention is not limited to the above-mentioned recording layer. In the case of vertical, the present invention also includes the case where the condition of maintaining a certain angular difference from the vertical line is optimized. As described above, in the case where information is recorded by adjusting the light reflectance at 5 or more stages (as compared with 5 or lower stages) Comparison of the number of segments) is confirmed to be particularly significant and useful. In addition, the incident angle control is not limited to the case where the entire area of the optical recording medium is implemented. The present invention also includes a specific area of the optical recording medium (for example, it is easy to generate Curved area) (see inventions (3), (6), etc.). Preferred Embodiments Examples of embodiments of the present invention will be described in detail below with reference to the drawings. An optical recording medium (disc) 10 used as an example of the embodiment of the present invention is a CD-R using a pigment material or a CD-RW using a phase change material in the recording layer 12. In the case of CD-R, for example, it includes a substrate 14 made of a transparent substrate, and a pigmented material that covers the laser beam guiding groove 16 formed on one side (top of FIG. 1) of the substrate 14 and is applied. The foregoing recording layer 12 is formed, and a gold or silver reflective film 18 formed by sputtering or the like and a protective layer 20 covering the outside of the reflective film 18 are formed on the upper side of the recording layer 12. In the case of CD-RW, for example, the covering trench 16 includes a lower protective layer (dielectric layer) formed at least by film formation, a recording layer composed of a phase change material, an upper protective layer (dielectric layer), and light reflection. The layer is further formed by covering the protective layer 20. The pigments used in the aforementioned recording layer 12 are generally cyanine pigments, merocyanine pigments, methine-based pigments and their inducers, and benzenesulfonic acid metal complexes. The paper size applies to the Chinese National Standard (CNS) A4 (210X297 mm) (Please read the notes on the back before filling this page) -10- 577057 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 _ B7__ V. Description of the invention (S (酉 太) cyanine pigment, (艸Organic pigments such as cyanine (cyanide) cyanine pigments, azo pigments, and phase change materials are generally GeSbTe-based, AglnSbTe-based, etc. The multi-level recording of the optical recording medium 10 described above is shown in FIG. 2 The optical recording device 30 is actually implemented. This optical recording device 30 is a CD-R / RW recorder, and a condition in which the optical recording medium (disc) 10 is maintained at a constant linear speed through a spindle servo 3 1 and a spindle motor 32 The rotary drive records information on the optical recording medium (disc) 10 by a laser beam from the laser 36. The laser driver (irradiation control device) 38 controls the equivalent of one piece of information according to the recorded information. Hypothetical record shown (Detailed later) The irradiation time of the laser beam of 40, for example, the number of laser pulses input to the aforementioned laser 36. The symbol 42 in FIG. 2 includes an objective lens 42A, a half mirror 42B, a light receiving objective lens 42D, The optical system irradiated by the light receiver FD. The objective lens 42A is controlled by the focus tracking server 44 so that the laser beam is focused on the recording layer 12 of the disc 10. The reflected light reflected by the optical recording medium 10 is The reflecting mirror 42B reflects at approximately a right angle, and is incident on the light receiving lens FD through the light receiving objective lens 42D, and is read as a multi-level signal. The entire illumination optical system 42 is positioned by the servo mechanism 42. The servo mechanism 42 is provided with : Feed servo unit 46, tilt servo unit 47A, and bend sensor 42B. The feed servo unit 46 synchronizes the irradiation optical system 42 with the rotation of the optical recording medium 10 from the inside to the outside. This paper size applies China National Standard (CNS) A4 specification (210X297 mm) (Please read the precautions on the back before filling this page)
訂 -11- 577057 經濟部智慧財產局員工消費合作社印製 A7 B7五、發明説明（3 側在直徑方向上移動控制。彎曲感測器42B，測量光記錄媒 體1 0的彎曲量輸入至傾斜伺服機構部47 A。傾斜伺服機構 部47 A根據上述訊號傾斜控制照射光學系，使照射光學系 42的光軸配合於光記錄媒體10的垂線（意爲假想記錄胞 40的垂線）。又，此伺服機構42自身，藉由未特別圖示的 控制裝置來控制。 本實施型態之伺服機構42擴大顯示於第3圖。 傾斜伺服機構部47 A，具備：以設於一端的支點p爲 中心可自由搖動地設置之滑動子70、設於該滑動子之另一 端側而使該另一端可上下移動之齒條以及小齒輪72，藉由 此滑動子70的傾斜使照射光學系42追隨於光記錄媒體1〇 的傾斜。又，此滑動子70的長邊方向與光記錄媒體1 〇之 直徑方向一致。 給送伺服機構部46具備在滑動子70上可移動的載台 74，藉由未特別圖示之驅動裝置來控制移動。於此載台74 上被安裝有照射光學系42。在此載台74上進而設置有：朝 向光記錄媒體10照射雷射光束的傾斜角檢測用雷射7 6、檢 測由光記錄媒體彎曲此雷射光束的反射光之至少2個傾斜 感測器47B。由兩個傾斜感測器47B的反射光量的不同， 可以檢測出光記錄媒體10的記錄層12之垂線、與照射光 學系42的光軸偏離。 又，此處採用測量記錄層12的垂線與光軸的偏離量的 方式，但使可以測量記錄層1 2的傾斜角亦可。又，在此顯 示垂線與光軸一致的場合，但本發明也包含總是維持一定 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） ' -- -12- (請先閱讀背面之注意事項再填寫本頁) •裝· 577057 經濟部智慧財產局員工消費合作社印製 A7 B7五、發明説明（如 角度差的場合。 如第4圖具體所示，雷射驅動器3 8，具備：胞時間設定 部60、記錄照射時間設定部62以及配分處理部64。 胞時間設定部60，連續規定指定的胞時間τ ( T 1、 丁2、T3、4、T5、T6.......)。結果，例如對雷射36之光 記錄媒體10的移動速度（線速度）爲v的場合，於此光記 錄媒體10上連續規定長度Η爲「vx T」的假想記錄胞40。 記錄照射時間設定部62，於上述胞時間Τ內規定5階 段以上（此處爲t Α〜tG之七階段）的照射時間 (tA........ tG )。此場合，將tA........tG預先記錄於 記憶體，以將其讀出來規定亦可，或者以讀取被寫入光記 錄媒體10的記錄照射時間資訊來規定亦可。 配分處理部64，調變被容納於控制裝置50的原資訊， 設定多等級記錄用的位元系列而分配各胞時間T。此多等級 用位元系歹!1，在此處存在7階段（A、B、C、、E、F、G ) 之記錄標記，所以例如爲{ B、E、D、C、G、G.......}等。 此各數値，意味著形成於各記錄胞40的記錄標記的等級。 亦即，以對應於上述位元系列的各等級的方式，把上述照 射時間tA〜tG分配於各胞時間ΤΙ、T2........ 於光記錄媒體10，如第1圖所示，在前述溝16內，於 碟片34的圓周方向S (亦即溝1 6的長邊方向）連續規定假 想記錄胞40。各假想記錄胞40的圓周方向S的單位長度係 Η ( - vx T)，被設定爲比光束直徑（光束腰的直徑）D還 要短的長度（參照第5圖）。 本紙張尺度適用中國國家標準（CNS ) Α4規格（210Χ297公釐） (請先閱讀背面之注意事項再填寫本頁) -13- 577057 經濟部智慧財產局員工消費合作社印製 A7 _ B7五、發明説明（ 使假想記錄胞40之與上述單位長Η (= vx Τ )直角相 交的方向之單位寬幅Β係與上述溝1 6的寬幅W約略一致。 上述雷射36之雷射光束的波長爲λ、照射光學系42 之物鏡42Α的開口數爲ΝΑ的場合，以使前述溝16的寬幅 W 成爲 0·20χ ( λ /NA) < W < 0.5 0χ (λ /NA)的方式設定。 例如，於本實施型態λ = 785 ( nm) 、ΝΑ = 0.5，所以溝幅 W被設定於0.31 < W < 0.79( // m)的範圍內。又，假想記錄 胞40的單位長度Η以成爲Η<0.65χ ( λ /NA)的方式設 定，在上述條件成爲H< 1.02(// m)。此外在本實施型態，與 相鄰的溝16之間隔（軌道間距）P被設定爲0·50χ ( λ /NA ) < Ρ < 1.2χ (又 /ΝΑ)。 對每個假想記錄胞40照射雷射光束，因應應該記錄的 資訊而形成模式例示之記錄標記48 Α〜48G。 具體而言，以包含以下步驟的方式形成記錄標記48 A〜 48G。 在光記錄媒體10上記錄實資訊時，藉由設定胞時間T 而如先前所述般連續規定假想記錄胞40，設定對此假想記 錄胞4 0之雷射光束的照射時間t A〜t G。 結果，如第6圖之時間圖所示，對應於調變原資訊而 得到之位元列{ Β、E、D、C、G、G.......}在各胞時間T1、 T2、T3……被分配照射時間{tB、tE、tD、tC、tG、 tG.......丨。又，此處顯示由各胞時間T的開始處設定照射 時間t的場合（亦即先端基準），但於各胞時間T的中央 設定照射時間的場合（中間基準），或者以各胞時間T的 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） (請先閲讀背面之注意事項再填寫本頁) 裝· 訂 -14 - 577057 A7 B7 經濟部智慧財產局員工消費合作社印製 五、發明説明（）2 後側爲基準設定照射時間的場合（後端基準）也是有可能 的。 依照此時間圖，於照射時間t照射雷射光束實際形成記 錄標記48 A〜48G的話，可以將各假想記錄胞40全體設定 爲如所希望的光反射率。 又，此記錄標記48 A〜48G不是形成於雷射光束的光點 全體而是形成於中心部（雷射光束雖是圓形的，但因使碟 片10旋轉同時照射雷射光束，所以記錄標記因應於照射時 間的長度而成爲長圓形）。 因爲被聚焦的雷射光束，一般呈局斯分佈，但於記錄 層1 2，只有雷射光束的照射能量超過某閾値的部分進行記 錄，因此由中心起依序向外側擴張的方式被形成記錄標記 48 A〜48G。藉此，例如第5圖所示，可以形成對假想記錄 胞40之佔有率不同的7階段記錄標記48 A〜48G。 此場合，記錄標記48 A〜48G之分別的大小，以使達成 假想記錄胞40讀出而照射雷射光束時之反射光的光反射率 成爲7階段的方式設定。前述光反射率，在記錄標記越小 時，變得越大，記錄標記未被形成之假想記錄胞具有最大 的反射率，被形成最大記錄標記48G的假想記錄胞則成爲 最小反射率。進而詳言之，前述光反射率，包含各記錄標 記48 A〜48G的光透過率，係以對假想記錄胞40之佔有率 來決定的。 又，記錄標記48 A〜48G自身的光透過率，在構成記錄 層1 2的材料隨著雷射光束的照射而分解變質，其折射率改 (請先閱讀背面之注意事項再填寫本頁) # 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） -15- 577057 A7 __ B7 五、發明説明（如 變的場合，或者隨著記錄層12的厚度方向的變化量而不 同。被形成的記錄標記部分的光透過率爲零的話，即使不 考慮此亦可，僅依照上述佔有率。 根據上述實施型態的光記錄手法，傾斜控制照射光學 系42，同時控制照射時間，可以達成5階段以上的多等級 記錄。 如此般於多等級記錄，傾斜控制變成重要要素的原因 如下。 在第7圖，顯示未進行傾斜控制的場合之記錄標記48A 〜48G的形成狀態。藉由對假想記錄胞40之記錄標記48A 〜48G的佔有率來調變光反射率之此一多等級記錄手法，也 應該有對雷射光束D而言記錄標記48 A〜48G尺寸更小的場 合。亦即，隨著由光記錄媒體10的反射光等而產生的coma 收差，雷射光束位置多少有些偏離，而使得超過假想記錄 胞40而形成記錄標記48 A〜48G的可能性很高。結果，對 假想記錄胞40之記錄標記48 A〜48G的佔有率無法如預定 般地設定，而使得全體的光反射率產生誤差。 進而，推察記錄標記48 A〜48G形成時之特有現象，在 如第8圖（A )所示無彎曲的狀態時可以進行良好的記錄， 但在第8圖（B)所示彎曲很大的場合記錄標記48 A〜48G 成爲傾斜的狀態。此雖係模式寫入者，但在目前爲止的2 値記錄的依賴訊號有無的場合並不會有問題。但是多等級 記錄的場合，因爲高精度多階段設定記錄標記48 A〜48G的 佔有率，隨著記錄訊號在淺的位置之顚動成分或（訊號的 本紙張尺度適用中國國家標準（CNS ) A4規格（210X 297公釐） (請先閱讀背面之注意事項再填寫本頁) •裝. 訂 經濟部智慧財產局員工消費合作社印製 -16- 577057 A7 B7 經濟部智慧財產局員工消費合作社印製 五、發明説明（奴 偏離）深度位置之顫動成分，而使綜合的顫動增大（佔有 率的誤差增大），使得進行良好的記錄變得困難。 又，進而推察再生時特有的現象的話，發現如第9圖 (A)所示，如果無彎曲的狀態可得良好的再生訊號，但相 對於此，如第9圖（B )所示碟片彎曲大的場合，會讀取到 鄰接的記錄標記4 8 A〜4 8 G，串訊的影響變大。隨著此現象 導致了再生訊號的劣化。 另一方面，在本實施型態，藉由傾斜感測器檢測出記 錄或者讀取時之雷射光束的光軸，與光記錄媒體1 〇的記錄 層1 2 (假想記錄胞40 )之垂線之間的偏離量（偏離角）， 總是使其偏離成爲最小的方式來傾斜控制照射光學系42， 因此沿著各假想記錄胞40的中心線（參照第1圖）可以正 確形成記錄標記48A〜48G。 結果，變成可以高精度地設定假想記錄胞40全體之光 反射率，進而，含可以使假想記錄胞40的尺寸（特別是寬 幅方向）更爲緊密，可以飛躍提升光記錄媒體10的記錄密 度。 例如，照射光學系42之物鏡開口數爲NA，雷射光束 的波長爲λ的場合，假想記錄胞的單位寬幅B可以設定爲 比0·5χ ( λ /ΝΑ)還要小，或者使軌道間距設定爲比0.7χ (入/ΝΑ )還要小。 此外，如以上所述進行，抑制假想記錄胞40全體的光 反射率之誤差（偏離）的話，可以縮小等級階段幅而使總 合等級數（此處爲Α〜G之七階段）增加，而可以更爲提高 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） ^ -17- (請先閲讀背面之注意事項再填寫本頁) 訂 577057 A7 B7 五、發明説明（^ 光記錄媒體的記錄密度。 (請先閲讀背面之注意事項再填寫本頁) 在本實施型態之例，主要是針對光記錄媒體10之記錄 層12爲有機色素材料所構成的CD—R的場合來說明，但記 錄層採用相變化記錄層之CD — RW形式的光記錄媒體亦可 使用，除CD —/CD — RW以外的光記錄媒體亦可適用。 此外，在本實施型態之例，如第4圖所示，因爲形成 讀取雷射的具光光束的直徑D以下的長度或者寬幅之記錄 標記（此處爲所有的記錄標記48 A〜48G )也可以充分讀取 資料，因此與從前相比飛躍提升單位面積的記錄密度。 又，在本實施型態之例，顯示使所有的記錄標記成爲 聚光光束的直徑D以下的場合，但本發明並不以此爲限， 只有記錄標記的一部份在直徑D以下的場合，或所有的記 錄標記都在聚光光束直徑D以上的場合也包含在內。 又，在上述光記錄裝置30，顯示使用雷射驅動器38設 定雷射光束的照射時間的場合，但隨著照射功率而形成不 同大小的記錄標記亦可。本發明只要結果是可以控制雷射 光束的照射即可，例如使用可以調變雷射光束的透過情形 經濟部智慧財產局員工消費合作社印製 之光圈快門來控制雷射光束的照射時間或者照射功率亦 可〇 於上述實施型態之例，記錄層12係使用花青色素等有 機色素者，但本發明並不以此爲限定，使用上述以外的有 機色素或者是無機材料亦可。或者適當使用其他材料亦 可。但是在如上述般使用有機色素的場合，對應於雷射光 束之5階段以上的照射時間，可以確實使記錄標記的大小 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公董） -18- 577057 經濟部智慧財產局員工消費合作社印製 A7 ____ B7 ______五、發明説明（1>6 改變而記錄，可以極高的精度讀取各記錄標記。 進而，藉由上述光記錄裝置30形成記錄標記時，被設 定於記錄層1 2上之假想記錄胞40的尺寸，並不以實施型 態之例爲限。此處顯示假想記錄胞40的單邊寬幅B與溝幅 W幾乎一致的場合，但如果能夠使雷射光束的光束腰徑更 爲縮小，則爲溝16的寬幅W以下亦可。關於單位長度Η 也是同樣。在另一方面，以8階段等更多階段記錄記錄標 記的場合，使假想記錄胞40的大小設定爲雷射光束腰以上 的大小亦可。在該場合，某一部份的記錄標記，可以使成 爲光束腰以上的大小。 又，前述雷射光束，在記錄層12的位置爲圓形，但如 第10圖所示，例如對物鏡42Α加上光束整形稜鏡42C或者 加上孔眼等，使光束形狀在記錄媒體1〇的給送方向上縮 短，而於直交方向上較長的長圓形狀或者是線狀亦可。在 此場合，因爲記錄標記49縮短所以可以使假想記錄胞更爲 縮短。亦即可以提高記錄密度。 進而，在此光記錄媒體10，如第1圖符號5 2所示，預 先使配合於訊號調變的段數之反射率不同的複數坑亦可。 或者於該光記錄媒體之一部分預先藉由本發明之光記錄方 法來進行多等級記錄亦可。在這些複數的坑5 2及/或已經多 等級記錄的部分之記錄標記54，記錄：個別識別該記錄媒 體之資訊、識別其係多等級記錄用光記錄媒體之資訊、供 決定記錄再生該記錄媒體之用的雷射光束的照射時間之資 訊、關於溝的寬幅W之資訊等特定資訊亦可。該特定資 本紙張尺度適用中國國家標準（CNS ) Α4規格（21〇Χ297公釐) ' " -19- (請先閲讀背面之注意事項再填寫本頁) 577057 經濟部智慧財產局員工消費合作社印製 A7 ___ B7_五、發明説明（扣 訊，藉由在該光記錄媒體之再生及/或記錄時讀入，可以確 實識別其係多等級記錄用光記錄媒體，進而可以個別識別 這些資訊，可以進行更爲確實的多等級記錄/再生。 通常，CD—R/RW或DVD — R/RW用之媒體，藉由使記 錄溝蛇行（wobble )而放入訊號。此訊號被稱爲位址訊號， 記錄裝置讀取此位址訊號而可以使記錄頭移動往決定好的 位置。 例如，CD — R/RW的場合，於此位址訊號，記錄著使位 置置換爲時間的分/秒之時間碼。記錄裝置，讀取此時間 碼，使讀取頭移動至讀入（read-in)部分，而可以讀入各種資 料。 此發明之多等級光記錄媒體，以適用於CD — R/RW的 方式在記錄裝置使用（記錄/再生）的場合，可以採用根據 蛇行之位址訊號。但是，與通常的CD — R/RW的時間碼不 同，採用的是地址碼等訊號方式。在通常的記錄裝置，無 法讀取與CD — R/RW不同的位址訊號，因而不能使讀取頭 移往指定的位置（在此場合，多等級記錄光媒體會由記錄 裝置中排出）。 另一方面，對應於多等級記錄的記錄裝置，預先設定 爲可以認識此特殊的位址的話，可以使讀取頭移往讀入部 分而讀出訊號。 總之，在多等級光記錄媒體，藉由採用與通常不同的 位址，可以與其他的光記錄媒體區別。 利用上述蛇行的記錄，例如第11圖所例示，藉由調變 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） (請先閲讀背面之注意事項再填寫本頁) -20 - 577057 經濟部智慧財產局員工消費合作社印製 A 7 _ B7___五、發明説明（h 光記錄媒體10的讀入區域102之溝104A〜104C的蛇行而 進行。 具體而言，如第1 2圖所例示，不改變蛇行的振幅 Wb，而改變各溝104A、104B、104C的蛇行週期Τα、Tb、 Tc。例如，第11圖所示的使用者區域1 〇6之溝1 6的蛇行週 期T〇爲基本週期，比其還長的蛇行週期Tb爲「1」，比其 還短的蛇行週期Τα、T。爲「0」之2値訊號載於其上，而記 錄上述各種資訊。亦即，例如，蛇行週期如上所示，由光 記錄媒體之內週側起爲「0」、「1」、「0」時，顯示此光 記錄媒體10爲多等級記錄用。 此外，如上述之預先被決定的資訊，作爲記錄開始位 置資訊，根據此而由使用者區域106之指定位置開始作爲 記錄開始。此也成爲假想記錄胞40的開始位置的資訊。 此外，作爲上述各種資訊的其他記錄方法之例，如第 1 3圖所示，使上述各種資訊，載於被形成於各溝1 6間的島 17之島預記錄坑17Α，例如島預記錄坑間的週期短的場合 爲「1」，長的場合爲「0」進行2値記錄。 進而做爲其他例，於第14圖或第1圖以符號56所 示，使溝1 6中斷，而以中斷的溝的長度，例如短的場合爲 「1」、長的場合爲「0」。 顯示於上述第11、13、14圖之資訊記錄手段所導致之 資訊，藉由從前的2値記錄型的再生裝置也可以讀取的 話’即使把此多等級光記錄媒體誤裝塡於2値記錄型之再 生及/或記錄裝置，也可以容易判別出其係多等級型。 本紙張尺度適用中國國家標準（CNS ) Α4規格（210X297公釐) ~ -21 - (請先閲讀背面之注意事項再填寫本頁) 577057 經濟部智慧財產局員工消費合作社印製 A7 __B7_五、發明説明（如 進而’上述之各種資訊，例如第15圖所示，在讀入區 域102可以預先多等級記錄。此場合，於第15圖，藉由最 初的5個假想記錄胞401〜405之記錄標記，可以記錄其係 多等級記錄媒體以及多等級記錄之段數，而次5個假想記 錄胞406〜410之記錄標記可以記錄下記錄或再生之用的較 佳雷射功率。這些方法可以單獨利用或者組合利用。 根據相關於本發明之光記錄方法以及光記錄裝置，可 以因應供記錄之資料而達成多等級記錄，進而可以使由該 記錄標記所讀取的訊號特性更爲良好。 圖面之簡單說明 第1圖係顯示相關於本發明的實施型態之例之光記錄 媒體的重要部位之部分剖面之立體圖。 第2圖係顯示於該光記錄媒體使用雷射光束記錄資訊 之用的光記錄裝置之方塊圖。 第3圖顯示包含於該光記錄裝置的伺服機構的構成之 方塊圖。 第4圖顯示包含於該光記錄裝置的雷射驅動器的構成 之方塊圖。 第5圖係顯示藉由該光記錄裝置在記錄層形成記錄標 記時之該記錄標記與假想記錄胞以及其光反射率之關係的 模式圖。 第6圖係顯示藉由該光記錄裝置在記錄層形成記錄標 記時之雷射光束照射的計時圖之產生過程的線圖。 (請先閲讀背面之注意事項再填寫本頁) 裝· 訂 本紙張尺度適用中國國家標準（CNS ) A4規格（210 X297公釐） 22- 577057 經濟部智慧財產局員工消費合作社印製 A7 B7 _五、發明説明（ 第7圖顯示不進行傾斜控制而對光記錄媒體進行多等 級記錄之狀態之立體圖。 第8圖模式顯示不進行傾斜控制，而在假想記錄胞形 成記錄標記時之記錄狀態的剖面圖。 第9圖係模式顯示不進行傾斜控制時，讀取記錄標記 的狀態之剖面圖。 第10圖係顯示照射假想記錄胞的雷射光束爲其他形狀 的場合之立體圖。 第11圖係擴大顯示本發明之光記錄媒體之預先記錄各 種資訊的顫動（wobble)之模式圖。 第1 2圖係顯示該顫動的顫動週期與2値訊號之關係的 線圖。 第1 3圖係顯示本發明之光記錄媒體之記錄各種資訊之 島預記錄坑（land-prepit)與2値訊號的關係之模式圖。 第14圖係顯示本發明之光記錄媒體之記錄各種資訊而 中斷之溝（groove)長度與2値訊號的關係之模式圖。 第1 5圖顯示本發明之光記錄媒體之記錄各種資訊的假 想記錄胞與記錄標記之模式圖。 符號說明 10 光記錄媒體 12 記錄層 14 基板 16 溝 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 一 -23- (請先閲讀背面之注意事項再填寫本頁)Order-11- 577057 Printed by A7 B7, Consumer Cooperatives, Intellectual Property Bureau, Ministry of Economic Affairs, V. Description of the invention (3 sides are moved and controlled in the diameter direction. Bend sensor 42B, measuring the amount of bending of the optical recording medium 10 is input to the tilt servo The mechanism section 47 A. The tilt servo mechanism section 47 A controls the irradiation optical system based on the above-mentioned signal tilt, so that the optical axis of the irradiation optical system 42 fits the vertical line of the optical recording medium 10 (meaning the vertical line of the imaginary recording cell 40). The servo mechanism 42 itself is controlled by a control device (not shown). The servo mechanism 42 of this embodiment is shown enlarged in Fig. 3. The tilt servo mechanism 47 A is provided with a fulcrum p provided at one end as a center. A slider 70 that can be freely shaken, a rack and a pinion 72 provided on the other end side of the slider so that the other end can move up and down, and the illumination optics 42 follows the tilt of the slider 70 The inclination of the optical recording medium 10. The longitudinal direction of the slider 70 coincides with the diameter direction of the optical recording medium 10. The feed servo mechanism section 46 includes a stage 74 that is movable on the slider 70. The movement is controlled by a driving device (not shown). An irradiation optical system 42 is mounted on the stage 74. The stage 74 is further provided with an inclination angle detection for irradiating a laser beam toward the optical recording medium 10. Use laser 7 6. Detect at least two tilt sensors 47B of the reflected light of the laser beam bent by the optical recording medium. The difference in the reflected light amount of the two tilt sensors 47B can detect the The vertical line of the recording layer 12 is deviated from the optical axis of the irradiation optical system 42. Here, the method of measuring the deviation amount of the vertical line of the recording layer 12 from the optical axis is used, but it is also possible to measure the inclination angle of the recording layer 12. In addition, in this case, the vertical line is consistent with the optical axis, but the present invention also includes that the paper size is always maintained at a certain size. The Chinese National Standard (CNS) A4 specification (210X297 mm) is applicable. '--12- (Please read the back first Note: Please fill in this page again) • Equipment · 577057 Printed by the Consumer Property Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Invention description (such as when the angle is poor. As shown in Figure 4, the laser driver 3 8 has : Cell The time setting unit 60, the recording irradiation time setting unit 62, and the distribution processing unit 64. The cell time setting unit 60 continuously specifies a specified cell time τ (T 1, T 2, T 3, 4, T 5, T 6 ... .). As a result, for example, when the moving speed (linear speed) of the optical recording medium 10 of the laser 36 is v, the optical recording medium 10 has a virtual recording cell 40 of a predetermined length Η “vx T” continuously. Record The irradiation time setting unit 62 specifies the irradiation time (tA ........ tG) in 5 or more stages (here, the seventh stage of t Α to tG) within the cell time T. In this case, tA. ... tG may be recorded in the memory in advance, and may be specified by reading it out, or may be specified by reading the recording irradiation time information written on the optical recording medium 10. The allocation processing unit 64 adjusts the original information stored in the control device 50, sets a bit series for multilevel recording, and allocates each cell time T. This multi-level uses the bit system 歹! 1, where there are record marks of 7 stages (A, B, C, E, F, G), so for example {B, E, D, C, G, G .......}Wait. Each of these numbers indicates the level of the recording mark formed in each recording cell 40. That is, in a manner corresponding to each level of the above-mentioned bit series, the above-mentioned irradiation time tA ~ tG is allocated to each cell time T1, T2 ...... To the optical recording medium 10, as shown in FIG. 1 It is shown that, in the groove 16, the virtual recording cell 40 is continuously defined in the circumferential direction S of the disc 34 (that is, the long side direction of the groove 16). The unit length of the circumferential direction S of each virtual recording cell 40 is 系 (-vx T), and is set to a length shorter than the beam diameter (beam waist diameter) D (see FIG. 5). This paper size applies the Chinese National Standard (CNS) A4 specification (210 × 297 mm) (Please read the notes on the back before filling this page) -13- 577057 Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 _ B7 V. Invention Explanation (The unit width B of the direction where the imaginary record cell 40 intersects the above-mentioned unit length Η (= vx Τ) at right angles is approximately the same as the width W of the groove 16 above. The wavelength of the laser beam of the above-mentioned laser 36 When the number of openings of the objective lens 42A of the optical system 42 is λ, the width W of the groove 16 is set to 0 · 20χ (λ / NA) < W < 0.5 0χ (λ / NA) For example, in this embodiment, λ = 785 (nm) and NA = 0.5, so the groove width W is set in the range of 0.31 < W < 0.79 (// m). Furthermore, it is assumed that The unit length 设定 is set such that Η < 0.65χ (λ / NA) and H < 1.02 (// m) under the above conditions. In addition, in this embodiment, the distance (track pitch) from the adjacent groove 16 P is set to 0 · 50χ (λ / NA) < P < 1.2χ (also / NA). For each imaginary record cell 40 irradiation thunder The light beam forms recording marks 48 A to 48G exemplified in accordance with the information to be recorded. Specifically, the recording marks 48 A to 48G are formed in a manner that includes the following steps. When recording actual information on the optical recording medium 10, The cell time T is set and the imaginary recording cell 40 is continuously specified as described above, and the irradiation time t A to t G of the laser beam of the imaginary recording cell 40 is set. As a result, as shown in the timing chart of FIG. 6, The bit sequence {Β, E, D, C, G, G, ....} corresponding to the modulation source information is assigned irradiation time {tB, at each cell time T1, T2, T3 ... tE, tD, tC, tG, tG ....... 丨. Here, the case where the irradiation time t is set from the beginning of the cell time T (ie, the apex reference) is shown here, but at the cell time T When setting the irradiation time in the center (intermediate reference), or according to the paper size of each cell time T, the Chinese National Standard (CNS) A4 specification (210X297 mm) is applied (please read the precautions on the back before filling this page). Order -14-577057 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs Note (2) It is also possible to set the irradiation time on the back side as the reference (back-end reference). According to this time chart, when the laser beam is irradiated at the irradiation time t to actually form the recording marks 48 A to 48G, each hypothesis can be set. The entire recording cell 40 is set to a desired light reflectance. In addition, the recording marks 48 A to 48G are formed not at the entire spot of the laser beam, but at the center. (Although the laser beam is circular, it is recorded by rotating the disc 10 while irradiating the laser beam. The mark becomes oblong according to the length of the irradiation time). Because the focused laser beam generally has a local distribution, but in the recording layer 12, only the part where the irradiation energy of the laser beam exceeds a certain threshold is recorded, so the recording is formed by expanding outward from the center in order. Mark 48 A ~ 48G. Thereby, for example, as shown in FIG. 5, it is possible to form 7-stage recording marks 48 A to 48G with different occupancy ratios to the virtual recording cell 40. In this case, the respective sizes of the recording marks 48 A to 48G are set so that the light reflectance of the reflected light when the laser beam is irradiated when reading out the virtual recording cell 40 is achieved in seven stages. The aforementioned light reflectance becomes larger as the recording mark becomes smaller. An imaginary recording cell in which a recording mark is not formed has a maximum reflectance, and an imaginary recording cell in which a maximum recording mark of 48G is formed becomes a minimum reflectance. Furthermore, in detail, the aforementioned light reflectance includes the light transmittance of each of the recording marks 48 A to 48 G, and is determined by the occupation ratio of the hypothetical recording cell 40. In addition, the light transmittance of the recording marks 48 A to 48G is degraded and deteriorated in the material constituting the recording layer 12 with the irradiation of the laser beam, and its refractive index is changed (please read the precautions on the back before filling this page) # This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) -15- 577057 A7 __ B7 V. Description of the invention (if it changes, or it varies with the thickness direction of the recording layer 12). If the light transmittance of the formed recording mark portion is zero, the above-mentioned occupancy rate may be used even if it is not taken into account. According to the optical recording method of the above embodiment, the irradiation optical system 42 may be tilted and the irradiation time may be controlled at the same time. Achieve multi-level records of 5 levels or more. The reason why tilt control becomes an important factor is as follows for multi-level records. Figure 7 shows the formation status of record marks 48A to 48G when tilt control is not performed. This multi-level recording method that imaginarily records the occupancy of the recording marks 48A to 48G of the cell 40 to adjust the light reflectance should also have a recording target for the laser beam D In the case of 48 A to 48 G, the size is smaller. That is, as the coma difference caused by the reflected light of the optical recording medium 10, the position of the laser beam slightly deviates, so that the recording mark is formed beyond the imaginary recording cell 40. The probability of 48 A to 48 G is very high. As a result, the occupancy rate of the recording marks 48 A to 48 G of the hypothetical recording cell 40 cannot be set as intended, which causes an error in the overall light reflectance. Furthermore, the recording mark 48 is estimated. A phenomenon unique to the formation of A ~ 48G, good recording can be performed in the state without bending as shown in Fig. 8 (A), but the mark 48 A ~ is recorded in the case of great bending as shown in Fig. 8 (B). The 48G is tilted. Although this is a mode writer, it is not a problem in the case where the 2 値 record depends on the presence or absence of the signal. However, in the case of multi-level recording, the high-precision multi-stage setting of the recording mark 48 A ~ 48G occupancy rate, with the movement of the recorded signal at a shallow position or (the paper size of the signal applies the Chinese National Standard (CNS) A4 specification (210X 297 mm)) (Please read the notes on the back first (Fill in this page again) • Pack. Order printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs-16- 577057 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs Enhancing the general chatter (increasing the error of the occupancy rate) makes it difficult to perform good recording. Furthermore, when the phenomenon peculiar to reproduction is examined, it is found that as shown in FIG. 9 (A), if there is no bending A good reproduction signal can be obtained, but in contrast, when the disc is bent as shown in Figure 9 (B), the adjacent recording marks 4 8 A to 4 8 G will be read, and the influence of crosstalk will change. Big. With this phenomenon, the reproduction signal is deteriorated. On the other hand, in this embodiment, the vertical axis of the laser beam during recording or reading is detected by the tilt sensor and the perpendicular to the recording layer 12 (the virtual recording cell 40) of the optical recording medium 10. The amount of deviation (offset angle) between the illumination optical system 42 is always controlled in such a way that the deviation is minimized, so that the recording mark 48A can be formed accurately along the center line of each imaginary recording cell 40 (see FIG. 1). ~ 48G. As a result, it becomes possible to set the light reflectance of the entire hypothetical recording cell 40 with high accuracy, and further, the size (especially the wide direction) of the hypothetical recording cell 40 can be made closer, which can greatly increase the recording density of the optical recording medium 10. . For example, when the number of objective lens openings of the irradiating optical system 42 is NA and the wavelength of the laser beam is λ, the unit width B of the imaginary recording cell can be set to be smaller than 0 · 5χ (λ / NA), or the orbit The pitch is set to be smaller than 0.7χ (in / ΝΑ). In addition, as described above, if the error (deviation) of the light reflectance of the entire hypothetical recording cell 40 is suppressed, the step size can be reduced to increase the total number of steps (here, the seventh step of A to G). The paper size can be further increased to apply the Chinese National Standard (CNS) A4 specifications (210X297 mm) ^ -17- (Please read the precautions on the back before filling this page) Order 577057 A7 B7 V. Description of the invention (^ Light Recording density of the recording medium. (Please read the precautions on the back before filling out this page.) In the example of this embodiment, it is mainly for the case where the recording layer 12 of the optical recording medium 10 is a CD-R composed of organic pigment materials. For explanation, CD-RW optical recording media in which the recording layer is a phase change recording layer can also be used, and optical recording media other than CD- / CD-RW can also be applied. In addition, in the example of this embodiment, As shown in Fig. 4, since a length or wide recording mark (here, all the recording marks 48 A to 48 G) of the laser light beam diameter D or less can be formed, the data can be read sufficiently. With from The recording density per unit area is improved compared to that by leaps and bounds. In the example of this embodiment, it is shown that all the recording marks are made smaller than the diameter D of the condensing light beam, but the present invention is not limited to this, only the recording marks It is also included when a part of the diameter is smaller than the diameter D, or when all the recording marks are larger than the diameter of the condensing beam. The optical recording device 30 described above uses a laser driver 38 to set a laser beam. The irradiation time of the laser beam, but it is also possible to form recording marks of different sizes with the irradiation power. As long as the result of the present invention can control the irradiation of the laser beam, for example, the transmission of the laser beam can be used to modulate the transmission of the laser beam. Employees of the Property Bureau consume the aperture shutters printed by cooperatives to control the irradiation time or power of the laser beam. In the example of the above implementation mode, the recording layer 12 is made of organic pigments such as cyanine pigments, but the present invention is not This is a limitation, and organic pigments or inorganic materials other than the above may be used. Or other materials may be used as appropriate. When organic pigments are used as described above, the size of the recording mark can be applied to the size of the recording mark in accordance with the Chinese National Standard (CNS) A4 specification (210X297). -18- 577057 Economy Printed by the Consumers ’Cooperative of the Ministry of Intellectual Property Bureau A7 ____ B7 ______ V. Description of the Invention (1 &6; 6 changes and records, each record mark can be read with high accuracy. Furthermore, when the record mark is formed by the optical recording device 30 described above The size of the imaginary recording cell 40 set on the recording layer 12 is not limited to the example of the implementation type. Here, the case where the single-sided width B and the groove width W of the imaginary recording cell 40 are almost the same, However, if the beam waist diameter of the laser beam can be further reduced, the width W of the groove 16 may be less than or equal to the width W of the groove 16. The same applies to the unit length Η. On the other hand, when recording marks are recorded in more steps such as 8 steps, the size of the virtual recording cell 40 may be set to a size equal to or larger than the waist of the laser beam. In this case, a part of the recording mark can be made larger than the beam waist. The laser beam is circular in the position of the recording layer 12, but as shown in FIG. 10, for example, the objective lens 42A is added with a beam shaping unit 42C or an eyelet is added to make the beam shape on the recording medium 10. The feeding direction is shortened, and the long oval shape or linear shape in the orthogonal direction may be used. In this case, since the recording mark 49 is shortened, the virtual recording cell can be made shorter. That is, the recording density can be increased. Furthermore, as shown by the reference numeral 52 in Fig. 1, the optical recording medium 10 may be a plurality of pits having different reflectances in accordance with the number of segments to be modulated in advance. Alternatively, multi-level recording may be performed on a part of the optical recording medium in advance by the optical recording method of the present invention. In these plural pits 5 2 and / or the record mark 54 of the part that has been recorded in multiple levels, records: information that individually identifies the recording medium, information that identifies it as an optical recording medium for multi-level recording, and for recording the decision to reproduce the record Specific information such as information on the irradiation time of the laser beam used for the media and information on the width W of the groove may also be used. This specific capital paper size applies the Chinese National Standard (CNS) A4 specification (21〇297mm) '" -19- (Please read the precautions on the back before filling out this page) 577057 Printed by the Employees ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs System A7 ___ B7_ V. Description of the invention (withdrawal, by reading during the reproduction and / or recording of the optical recording medium, it can be surely identified that it is an optical recording medium for multi-level recording, and then this information can be identified individually, More reliable multi-level recording / reproduction is possible. Generally, media for CD-R / RW or DVD-R / RW are put into a signal by recording a wobble. This signal is called an address The signal reads the address signal and the recording device can move the recording head to a determined position. For example, in the case of CD-R / RW, the address signal records the position / minutes / seconds replaced by time. Time code. A recording device that reads this time code and moves the read head to the read-in section to read various materials. The multi-level optical recording medium of this invention is suitable for CD — R / The way of RW When the device is used (recorded / reproduced), a signal based on the address of the snake can be used. However, unlike the normal CD-R / RW time code, a signal method such as an address code is used. In a normal recording device, it cannot be used. It reads a different address signal than CD-R / RW, so the read head cannot be moved to the specified position (in this case, multi-level recording optical media will be ejected from the recording device). On the other hand, corresponding to multiple The recording device for level recording is set in advance so that it can recognize this special address, so that the reading head can be moved to the reading part and the signal can be read out. In short, in multi-level optical recording media, by using different bits than usual The address can be distinguished from other optical recording media. Using the above-mentioned serpentine recording, such as illustrated in Figure 11, by adjusting the paper size to apply the Chinese National Standard (CNS) A4 specification (210X297 mm) (please read the back first) Please note this page before filling in this page) -20-577057 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A 7 _ B7___ V. Description of the invention (h Reading area of optical recording medium 10 1 The ditch of 02 grooves 104A to 104C is performed. Specifically, as illustrated in FIG. 12, the dangle periods Tα, Tb, and Tc of the ditch 104A, 104B, and 104C are not changed without changing the amplitude Wb of the dangle. For example, The meandering period T0 of the groove 16 of the user area 10 shown in FIG. 11 is the basic period, the meandering period Tb longer than it is “1”, and shorter meandering periods Tα, T. A 2 値 signal of "0" is carried thereon, and the above-mentioned various kinds of information are recorded. That is, for example, the meandering cycle is as shown above, and is "0", "1", "0" from the inner peripheral side of the optical recording medium. At this time, the optical recording medium 10 is displayed for multi-level recording. In addition, the information determined in advance as described above is used as the recording start position information, and from this, the designated position in the user area 106 is used as the recording start. This also becomes the information of the start position of the hypothetical record cell 40. In addition, as an example of other recording methods of the above-mentioned various kinds of information, as shown in FIG. 13, the above-mentioned various kinds of information are contained in the island pre-recording pit 17A of the island 17 formed between the grooves 16, for example, the island pre-recording When the period between pits is short, it is "1", and when it is long, it is "0". Furthermore, as another example, as shown in FIG. 14 or FIG. 1, reference numeral 56 indicates that the groove 16 is interrupted, and the length of the interrupted groove is, for example, "1" in a short case and "0" in a long case. . The information displayed by the information recording means shown in Figures 11, 13, and 14 above can be read by the previous 2 値 record type reproduction device. 'Even if this multi-level optical recording medium is mistakenly installed in 2 値The recording type reproduction and / or recording device can also be easily discriminated as a multi-level type. This paper size applies Chinese National Standard (CNS) A4 specification (210X297 mm) ~ -21-(Please read the precautions on the back before filling out this page) 577057 Printed by the Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs A7 __B7_ Description of the invention (As further described in the above-mentioned various information, for example, as shown in FIG. 15, the reading area 102 may be recorded in multiple levels in advance. In this case, in FIG. 15, the first five imaginary record cells 401 to 405 are used. The recording mark can record the number of segments of the multi-level recording medium and the multi-level recording, and the next 5 imaginary recording cells 406 to 410 can record the better laser power for recording or reproduction. These methods can Use alone or in combination. According to the optical recording method and the optical recording device related to the present invention, multi-level recording can be achieved according to the data to be recorded, and the signal characteristics read by the recording mark can be made better. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a partial cross section of an important part of an optical recording medium according to an example of an embodiment of the present invention. It is a block diagram of an optical recording device used for recording information using a laser beam on the optical recording medium. Fig. 3 is a block diagram showing the structure of a servo mechanism included in the optical recording device. Fig. 4 shows the optical recording device included in the optical recording medium. FIG. 5 is a block diagram showing the structure of a laser drive of a recording device. FIG. 5 is a schematic diagram showing the relationship between a recording mark, an imaginary recording cell, and its light reflectance when a recording mark is formed on a recording layer by the optical recording device. Fig. 6 is a line drawing showing the generation process of the timing chart of laser beam irradiation when a recording mark is formed on the recording layer by the optical recording device. (Please read the precautions on the back before filling this page) Standards are applicable to China National Standard (CNS) A4 specifications (210 X297 mm) 22- 577057 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 _V. Description of the invention (Figure 7 shows the optical recording medium without tilt control A perspective view of a state where multi-level recording is performed. The mode of FIG. 8 shows a sectional view of a recording state when tilt recording is not performed and a recording mark is formed on a hypothetical recording cell. Fig. 9 is a sectional view showing a mode in which a recording mark is read without tilting control. Fig. 10 is a perspective view showing a case where a laser beam irradiating an imaginary recording cell has another shape. Fig. 11 is an enlarged view. A pattern diagram showing wobble in which various kinds of information are recorded in advance in the optical recording medium of the present invention. Figures 12 and 12 are line diagrams showing the relationship between the wobbling period of the wobble and the 2 値 signal. Figures 13 and 13 show the present invention. The schematic diagram of the relationship between the land-prepit and the 2 値 signal of various information recorded on the optical recording medium. Fig. 14 shows a groove that interrupts the recording of various information by the optical recording medium of the present invention. The pattern diagram of the relationship between the length and the 2 値 signal. Fig. 15 shows a schematic diagram of an imaginary recording cell and a recording mark for recording various kinds of information on the optical recording medium of the present invention. Explanation of symbols 10 Optical recording medium 12 Recording layer 14 Substrate 16 groove