A7 S1S854 __B7 五、發明説明（1 ) 不贫明你關於 用 ^崎取祖<尤字哀|， 以記錄-可光學偵測之資料區域安排於資料軌跡内之結 構，此類軌跡係於與橫過帶狀物縱向方向之方向上延伸， 該裝置係備有-供應輪及拾取輪’用以於其縱向方向輸送 記錄載體；-輻射源偵測單元，用以供應—掃描束及將爲 記綠載體所反射之束轉換成電子信號；一鏡多角形，可續 著-旋轉軸旋轉’用以了科㈣方向上掃描束之掃描移 動：以及-接物系統’用以將掃描束聚焦於記綠載體上成 一掃描點，此鏡多角形係可傾斜。 由於數位化光學記綠技術之引入，越來越需要__ 用介質之儲存能力加大，以使例如數位式影像 存於此種介質内。於已知之數位式聲音碟片，或光碟 (compact disk，簡稱爲CD)及自此衍生之介質中，例如 CD-ROM、CD#，其儲存能力係由記錄載體之資訊平 面内形成之掃描點尺寸所決定，#描·㈣決定掃描裝置之 分解能’及資訊細節之最小尺寸，例如仍可個別檢測到之 資訊小洞。掃描點之尺寸可藉減小所使用讀出束之波長， 及/或藉增加形成掃描點之接物系统之㈣孔徑，而加以 經濟部中央標準局員工消費合作社印製 減小係肯定的，但這並不能形成_1〇倍或更大之儲存能力 之增加。 如於1994年SPIE，^2338卷，光學資料儲存，第8至1^ 頁「一緊密光學帶狀1己錄系袜（A C0mpact 〇pticai τ吵 Recording System)」文章中所述，可藉使用於其縱向方向 沿一光學掃描裝置移動之帶狀光學記錄載體，且其中資訊 經濟部中央標準局員工消費合作.社印製 A7 ----------B7 五、發明説明（2 ) 係形成於與帶狀物縱向方向垂直之方向延伸之資訊軌跡 内，而使儲存能力及寫入速度增加數次方之大小。爲了寫 入及/或讀出這些資訊軌跡，此掃描裝置係包含具有例如 六個鏡面或截面之一鏡多角形。在旋轉此鏡多角形時，連 續的鏡戴面之每個截面可確保掃描到一條資訊軌跡，因此 而寫入或讀出。 那麼即應可確保當讀出已寫入之資訊時，掃描點可確實 ^遵從即時掃描軌跡，較軌跡方向與鏡多角形之公稱位 直上記綠載體上掃描點所描述之軌跡不同。爲了這個目 的，將以一已知方法產生一軌跡錯誤信號，因此可藉此信 號而使掃描軌跡之方向與各軌跡相同。此種修正可藉使鏡 多角形之旋轉軸與來自輻射源偵測單元並入射至鏡多角形 上之掃描束之主要射線間之角度配合而加以完成’如於美 國專利第4,901,297號中所述。於此與資訊之磁一光寫入及 巧出有關之專利中，係建議使鏡多角形繞著第一及/或第 二傾斜軸之旋轉軸成傾斜，使成相互垂直且兩者均於其公 稱位置上與多角形之旋轉軸垂直。然而，若此傾斜一定須 發生於較大角度，則記錄載體上之掃描點將描述一不再與 直線軌跡相符之曲線掃描軌跡。 本發明之一目的係提供一光學帶狀掃描裝置，於此裝置 中並不產生此一問題。％爲了此一目的，此帶狀掃描裝置之 特徵爲鏡多角形繞著^傾斜之·軸係與來自輻射源偵測單 元’且入射至鏡多角形上之掃描束之主要射線呈平行3 於此帶狀掃描裝置内’由此記錄載體上掃描點所描述之 _·5- 本紙汝尺度適用中國國家標準（CNS ) Α4規格（210 X 297公釐) ' 丨 ^ ^ ^丨裝 訂-----γ線 (請先閩讀背面之注意事項再填奔本頁) 經濟部中央標準局員工消費合作 31S854 A? ______ B7 五、發明説明（3 ) 軌跡於較大傾斜角之狀況下仍維持直線。 本裝置之較佳具體實施例之特徵係，鏡多角形可傾斜繞 著之軸係與該主要射線—致。 此具體實施例之優點爲，截面之高度，亦即旋轉軸之方 向上之反寸’因此爲此多角形並不需具有較此多角形之區 咸内掃描束之直徑更大。因此，多角形之質量應可維持較 ，]、，所以可使多角形之起始速度更快，且旋轉頻率更高成 - 爲可能。 、 1 本發明之以上及其它方面將參考下文後述之具體實施例 而更爲清楚並加以闡明。 於圖形中： 圖1所示係光學帶狀掃描裝置之圖形，以及 圖2所示係此裝置中所使用輻射源偵測單元之一具體實施 iH j 於圖1中，編號1係指一帶狀記錄載體。此帶狀物係自一 供應輪3至一拾取輪2通過一固定引導元件4直接輸送。此 裝置並不須包含任何其它之帶狀物引導元件。兩個輪子係 由不同之馬達所驅動。這些馬達可由使帶狀物之張力維持 一定之方式加以驅動。此帶狀物行進之方向係由箭頭5加 以指明。 此k置之掃描裝置係包含一輻射源偵測單元1 〇，供應一 掃描束b : —旋轉鏡多爲形，將此束，例如平行地，反射 至接物透鏡3 0，並使此束聚焦至帶狀物上之一輻射點v 上。此鏡多角形係包含例如f i至f】0之十個鏡截面，且於操 -6- 色用+國國家標準（CNS ) A4規格（210X 297公釐) "~~~' ---^------^丨裝------訂-----一線 (請先聞讀背面之注意事項再填寫太頁) A7 B7 五、發明説明（ 作時，此多角形將繞著軸心2 1於箭頭2 2之方向上旋轉。每 個於束b之輻射路徑内旋轉之截面，於此圖中係截面，將 會移動於箭頭2 5之方向上之束，與帶狀物行進方向5垂 直’通過接物透鏡之入射曈孔。由此透鏡形成之輻射點將 因此掃描一沿與方向5垂直之方向延伸之軌跡。藉由截面fi 至ί\〇等將連續掃描第二、第三條等之軌跡。 此來自單元1 0且入射在一鏡截面上之掃描束b係位於由 於來自鏡多角形之掃描束所定義之平面上，並於與掃描束 之中央位置成例如3 8度之角度上延伸，此掃描束係移動了 免;如4 8度之角度。此接物透鏡，於f - Θ透鏡形式，具有例 如丨.25毫米之有效焦距長度，及0.45之數値孔徑。可將掃 描點於垂直方向移動例如1毫米之距離。如此，將有可能 舄入與帶狀物行進方向垂直之方向上長1毫米之執跡。 經濟部中央標準局員工消費合作社印製 (請先閲讀背面之注意事項再填芎本頁) 可於帶狀物上寫入一些垂直資ΙίΙ軌跡之水平線條。爲 此，首先將自帶狀物之起始處寫入1毫米長之軌跡直至末 端。然後將帶狀物之行進方向反轉，則帶狀物及光學系統 相對彼此將位移略大於1毫米之距離，隨即寫入垂直軌跡 之另一條水平線條。如此，可於12.7毫米寬之帶狀物上形 成1 2條資訊軌跡。此裝置亦適用於記綠8毫米寬之帶狀 物。將寫入帶狀物之資訊讀出之有效方法係與寫入之方法 相似。然後爲帶狀物反射之束將橫過與輻射源偵測單元相 反方向内相同之光學路為。於斗單元内係以與一光學聲音 碟片（C D )播放器相同之方式獲得此資訊信號、聚焦錯誤信 號及軌跡錯誤信號。 本紙張尺度適用中國國家標準（CN’S ) A4規格（210X 297公釐） 經濟部中央標準局員工消費合作社印震 319854 A7 B7 五、發明説明（） 此輻射源偵測單元包含一高功率二極體雷射，具有例如 780毫微米之波長3若此接物透鏡具有0.45之NA，則將可 獲得可與光碟系統相抗衡之分解能。那麼將可獲得1位元 /微米之資訊密度，且一 12.7毫米寬及42米長之帶狀物將 可包含5 0什兆位元組之資訊。 於執跡方向之資訊密度係如0.6微米/位元，因此一軌跡 可包含大約1600位元。鏡多角形之公稱旋轉頻率係如每秒 -200〇轉。因此具十個截面之一鏡多1角形之掃描頻率則爲20 汁赫茲。於每軌跡1600位元之狀況下，可獲得每秒3 2百萬 ί立元之位元率。其執跡周期係如丨.6微米之大小。於掃描頻 车爲2 0仟赫茲時，帶狀物在讀出及寫入期間之速度將爲 3.2公分/秒。這是一相當低之速度，因此不需要太複雜之 奋狀物輸送機構。 圖2所示係輻射源偵測單元1〇之一可能具體實施例。此 星元係包含一二極體雷射形式之輻射源1丨，供應一發散束 b。此束係由一視準儀透鏡丨3轉換成一平行束，集中至鏡 多角形上。爲了使此束b與進行中之束分離，此束b將由記 綠載體所反射，並於第二次通過接物透鏡及爲鏡多角形第 —’入反射後再次進入視準儀透鏡1 3，此單元係由一具回折 光柵1 2之已知方法所形成，此光柵具有能將大部份返回束 之輻射能於第一次繞射時即繞射至偵測器丨4之狀況。一輻 射點V之影像v ’係於測器上形成。可了解blaze係指回 折光柵溝槽之壁面之斜率可使射線爲此種壁面折射之角度 等於第一次繞射時繞射之射線離開回折光柵之角度β如特 ________ - 8 - CNS ) A4^ ( 210^?^ - . ^ 种衣 . 訂 一 線 (請先閔讀背面之注意事項再填寫本頁) Μ濟部中央標準局負工消费合作社印裝 A7 _B7__ 1、發明説明（6 ) 刮於美國專利第4,665,310號内所述’此回折光柵可分成兩 半部，其中其回折光柵條紋之方向係不同的。然後束b ’係 分割成兩次束’並藉一包含一對每個次束使用之.丨貞測器單 元之偵測器產生一聚焦錯誤信號，亦即一信號表示接物透 鏡之焦點是否係位於帶狀物上掃描軌跡之平面上。 此種信號亦可藉由一具非線性差異之回折光柵周期之未 分割回折光柵而獲得。與一四分偵測器結合使用，如美國 專利4,358,200號中所述。此回折光柵使得此束成散光，且 口分偵測器可決定偵測器上輻射點之形狀，此形狀係與束 b聚焦在帶狀物上之範圍有關。 不使用回折光柵，亦可使用丰透過鏡面或極化敏感束分 離器及一安排於束分離器及接物透鏡之間之；1 /4波板組 合將前進及返回束分開’其中A係掃描束之波長。 爲了獲得一轨跡錯誤信號，亦可使用兩輔助束，係藉由 沉如一繞射回折光柵使此掃描束分裂。這些輔助束將構成 执路兩邊緣上之輻射點，此輻射點係投影至不同之偵測器 上。由這些偵測器所供應之輸出信號間之差即執跡錯誤信 號。此信號係與軌跡内資訊位元之本質無關。由於鏡多角 形之截面係與多角形之旋轉軸平行，因此此類輔助點係沿 與爲掃描點所橫過之路徑平行之直線移動。所以，可使用 於光磲系統内所使用之標準三點軌跡系統。 應 >王意的是，圖2中所、示之輻射源偵測單元僅係一可能具 體實施例。此單元可藉光碟技術中已知之多種方法加以修 改。例如，對散光聚焦錯誤偵測而言，可於反射掃描束之 ---------------- 9 - 本紙張尺度適用ϋϊϋ準（CNS > A4規格（2l〇x^^-- ---------裝-------訂-----)瘃 (請先閲讀背面之注意事項再填寫本頁) _________£7_ _________£7_ 經濟部中央標隼局員工消費合作社印製 A7 五 '發明説明（7 ) 路技上安排一圓柱形透鏡而非一散光回折光柵。亦可使用 佛寇特（Foucault)偵測方式代替散光聚焦錯誤偵測。於此 種方法中’係使用一屋頂稜鏡將由帶狀物反射之掃描束分 離成兩次束，每一束均與一偵測器對結合。每個次東相對 於其相關偵測器對之位置即係一聚焦之標準。此軌跡錯誤 信號可能不只是藉由兩輔助點所產生，亦可能只爲掃描束 所產生，藉將此東所用之偵測器分裂成兩部分。藉著將這 '些偵測部分乏信號與彼此扣徐，即可獲得此軌跡錯誤信 號。此方式已知爲推拉方法。 亦可和接钩或掃描透鏡3 〇安排於一致動器内（未顯示）， 以使此透鏡可於兩方向移動，一移動係作爲聚焦設定用， 另一個係軌跡用。爲了定義出一平均聚焦位置，可經由導 引元件4來輸送此帶狀物。然而，由於例如帶狀物厚度之 是共.仍可忐發生帶狀物資訊表面及透鏡3 〇間距離之低頻 改變：這可藉由該第-種移動加以補償，因此透鏡及帶狀 物表面間㈣可藉使透鏡之聚焦平面總是與帶狀物之資訊 表面一致之方法而使之改變3此聚焦控制可具有一非常小 I頻寬。若透鏡30之聚焦平面係與帶狀物表面成傾斜，則 必須進行-聚焦傾斜修正。爲達到此―目❾，導引元件4 可具有一可傾斜功能。 當寫入一空白帶狀物時，可將接物透鏡3〇固定於一固定 位置。此系統具有狗高、之穩定性以一固定之軌跡周期寫入 完全直線之軌跡。此系統中將不會有與掃描頻率大小相同 頻率之振動發生。 _____ 2J10- 本纸張尺度適用中國國家標準（CNS ) A4規格（2丨 ^ 裝 訂 f (請先鬩讀背面之注意事項再填寫本頁) Βί$854 Α7 --------- Β7 五、發明説明（8 ) 二寫入帶狀物時’掃描點及掃描軌跡可能發生 7 :布a生（相對移動。第-種係帶狀物於與軌跡方 可…订之方向料動3由於掃描路徑長度係經選擇較軌跡 此㈣動必不令人困擾。這可確保軌跡總 疋在知'描區域内。此一辟私夕难^ _ 杪動义唯一政應係已讀出信號内會 產生一微小延遲。第二種不希望產生之㈣㈣帶狀㈣ 進速度之微小差異所造成，這些差異可能造成一平均軌跡 錯誤。在帶狀物之讀出及再寫入期間，此一錯誤可藉由透 經濟部中央標準局負工消費合作社印製 鍵致動器可能造成之透鏡的第二種移動所補償，亦即透鏡 嚷著-與此透鏡之後聚焦平面平行，且較佳爲位於内，之 妯旋轉。此軸具有一與軌跡方向平行之方向。如此，爲了 補償該軌跡錯誤，可能可將掃描路徑於一與軌跡方向垂直 之方向手移。第三種不希望產生之移動係由軌跡與一相對 於掃描路徑之傾斜所造成。爲了補償此一移動，可藉一相 對應方法使鏡多角形傾斜，而使掃描路徑傾斜ΰ 如此’所有不規則之帶狀物移動均可藉由主動伺服控制 加以補償，因此並不需要一具微精度之非常精確之帶狀物 一導引系統。其帶狀物輸送機構係相當簡單：帶狀物係只 經由導引元件4自一輪直接輸送至另一輪。 爲了使由帶狀物上之知描點所描述之軌跡方向與軌跡方 向一致’可根據本發明使鏡多角形傾斜，其傾斜軸與來自 單元1 0之掃描束b的主姜射線平行，如圖1中所示s於此圖 中’多角形之旋轉軸係由編號3 5表示，且傾斜軸係由編號 4 0表示之。可藉由選擇傾斜軸來確保由掃描點v所描述之 -11 - 本纸張尺度適用中國國家標準（CNS ) A4规格（210X 297公釐） M濟部中央標準局員工消費合作社印製 A7 ____B7 五、發明説明（9 ) 軌跡總是維持直線。 若，如囷1所示，傾斜軸40係與東1>之主要射線一致，則 當多角形傾斜時，多角形之即時使用戴面將不會於相對於 與旋轉軸平行之方向改變。其優點爲戴面之尺寸及此方向 内鏡多角形之尺寸並不須較戴面區域之束b直徑爲大，則 此多角形可爲薄形，以使其質量可以維持微小，且鏡多角 形之起始速度較快，旋轉頻率高。 ' 爲了能進行上述之移動’此鏡多角形係以電磁遊移及驅 動，此驅動及遊移單元45可依美國專利第5,171，984號中所 述地冗成。此多角形係可於六個自由度移動。可憎測到這 些移動並加以修正，若需要的話。可因此目的而使用如美 國專利第5,M5,182號中所述之位置偵測系統。利用此系 統，將可量得沿座標之，直角系統的三個軸之位移，及繞著 這些軸中其中兩個之旋轉。此一系統係與鏡多角形之反射 表面2 1及一安排在此表面中央之反射球狀元件2 3結合。此 位置偵測系統亦可如同一申請者之先前申請、尚未先行公 該之歐洲專利申請案（PHN 15.885 )及（PHN 15.891)所述地 完成。若多角形表面2 1係具有至少一含與其周圍不同反射 之區域24，則多角形繞軸35之旋轉速度及角度將可藉這些 位置偵測系統量測。 如已注意者，根據本發明之裝置亦可使用於讀出一先前 已寫入之帶狀記綠載，及用$對一空白帶狀物寫入及接 著讀出。最後提及之帶狀物之資訊層可爲一磁光層’且此 裝置應可藉已知方式以磁性裝置將帶狀物區域磁化而形 -12 -______ 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） -----^---II裝------訂-----γ诔 {請先閱讀背面之注意事項再填寫本頁) 五 、發明説明（1〇 ) A7 B7 以於孩處形成與它們周圍磁化方向相反之區域。更甚 者’單元10應可藉已知方式以極化敏感偵測器形成。此帶 狀物亦可不使用磁性層而使用一相改變層，其中資訊區域 係藉使結構區域性地自非晶質改變成結晶體，反之亦然， 而完成。於只用於讀出用之帶狀物中，其資訊亦可以資訊 層内之小洞形式’與已知之CD聲音碟片中者類似3 (請先閲讀背面之注意事項再填寫本頁，> 裴 .5Τ 線 經濟部中央標举局一貝工消f合作杜印裝 -13- 表纸張尺度適用中國國家標準（CNS ) /U規格（2】〇χ297公趁）A7 S1S854 __B7 Fifth, the invention description (1) It is not poor to understand that you use ^ 崎 取 祖 < 尤 字 巳 | to record-optically detectable data area arranged in the structure of the data track, such track is in Extending in the direction transverse to the longitudinal direction of the ribbon, the device is equipped with-supply wheel and pickup wheel to transport the record carrier in its longitudinal direction;-radiation source detection unit to supply-scanning beam and will In order to remember that the beam reflected by the green carrier is converted into an electronic signal; a mirror polygon can be continued-the rotation of the rotation axis is used for the scanning movement of the scanning beam in the direction of the science and technology: and-the object receiving system is used for the scanning beam Focusing on the green carrier into a scanning point, the polygonal system of this mirror can be tilted. Due to the introduction of digital optical green technology, there is an increasing need to increase the storage capacity of media to enable, for example, digital images to be stored in such media. In known digital audio discs, or compact disks (CDs) and media derived from them, such as CD-ROM, CD #, the storage capacity is formed by the scanning points formed in the information plane of the record carrier Determined by the size, # describe · (iv) determine the resolution of the scanning device and the minimum size of information details, such as information holes that can still be detected individually. It is affirmed that the size of the scanning point can be reduced by printing the wavelength of the read beam used, and / or by increasing the aperture of the attachment system forming the scanning point, and then printing it by the Staff Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economy But this does not result in a storage capacity increase of 10 times or more. As described in the article SPIE 1994, Volume ^ 2338, Optical Data Storage, pages 8 to 1 ^, "A compact optical ribbon 1 self-recording stocking (A C0mpact 〇pticai τ noisy Recording System)", available for borrowing A band-shaped optical record carrier that moves along an optical scanning device in its longitudinal direction, and among them, the consumer cooperation of the Central Standards Bureau of the Ministry of Information Economy. Printed by the company A7 ---------- B7 V. Description of invention (2 ) Is formed in an information track extending perpendicular to the longitudinal direction of the ribbon, which increases the storage capacity and writing speed by several times. In order to write and / or read out these information tracks, the scanning device includes a mirror polygon having, for example, one of six mirror surfaces or cross sections. When the polygon of the mirror is rotated, each section of the continuous mirror wearing surface can ensure that an information track is scanned, so it is written or read. Then it should be possible to ensure that when reading the written information, the scanning point can indeed follow the real-time scanning trajectory, which is different from the trajectory described by the scanning point on the green carrier compared to the nominal position of the trajectory direction and the mirror polygon. For this purpose, a track error signal will be generated by a known method, so that the direction of the scanning track can be made the same as each track by this signal. Such correction can be accomplished by matching the angle between the rotation axis of the mirror polygon and the main rays of the scanning beam from the radiation source detection unit incident on the mirror polygon as described in U.S. Patent No. 4,901,297 . In this patent related to magneto-optical writing and ingenuity of information, it is proposed to tilt the mirror polygon around the rotation axis of the first and / or second tilt axis so that they are perpendicular to each other and both Its nominal position is perpendicular to the rotation axis of the polygon. However, if this tilt must occur at a relatively large angle, the scan point on the record carrier will describe a curved scan trajectory that no longer matches the straight trajectory. An object of the present invention is to provide an optical strip scanning device in which this problem is not caused. % For this purpose, this strip-shaped scanning device is characterized by the mirror polygon around the tilt ^ axis is parallel to the main ray of the scanning beam from the radiation source detection unit and incident on the mirror polygon 3 In this strip-shaped scanning device 'described by the scanning point on the record carrier _ · 5- The standard of this paper is applicable to the Chinese National Standard (CNS) Α4 specifications (210 X 297 mm)' 丨 ^ ^ ^ 丨 Binding --- -γ line (please read the precautions on the back and then fill in this page) 31S854 A, Consumer Consumption Cooperation, Central Bureau of Standards, Ministry of Economic Affairs ______ B7 V. Description of the invention (3) The trajectory remains at a large inclination angle straight line. The preferred embodiment of the device is characterized in that the axis around which the mirror polygon can be tilted coincides with the main rays. The advantage of this particular embodiment is that the height of the cross-section, i.e., the reverse direction in the direction of the axis of rotation ', therefore, the polygon does not need to have a larger diameter than the scan area of the polygon. Therefore, the quality of the polygon should be able to be maintained,] ,, so that the initial speed of the polygon can be made faster, and the rotation frequency is higher-is possible. 1. The above and other aspects of the present invention will be clearer and clarified with reference to the specific embodiments described below. In the figure: Figure 1 is a diagram of an optical strip scanning device, and Figure 2 is a specific implementation of a radiation source detection unit used in this device iH j In Figure 1, the number 1 refers to a band Record carrier. This web is conveyed directly from a supply wheel 3 to a pickup wheel 2 through a fixed guide element 4. This device does not have to contain any other ribbon guiding elements. The two wheels are driven by different motors. These motors can be driven in such a way that the tension of the ribbon is maintained. The direction in which the ribbon travels is indicated by arrow 5. This scanning device includes a radiation source detection unit 10, which supplies a scanning beam b: the rotating mirror is mostly shaped, reflecting this beam, for example, in parallel, to the object-receiving lens 30, and causing the beam Focus on one of the radiation points v on the ribbon. The polygonal shape of this mirror contains ten sections of mirrors such as fi to f】 0, and it is used for operation-6-color + national standard (CNS) A4 specification (210X 297mm) " ~~~ '--- ^ ------ ^ 丨 installed ------ order ----- line (please read the notes on the back and fill in the page) A7 B7 5. Description of the invention Will rotate around the axis 2 1 in the direction of arrow 2 2. Each section that rotates in the radiation path of beam b, in this figure is a section that will move the beam in the direction of arrow 25 The ribbon travel direction 5 is perpendicular to the entrance aperture of the object lens. The radiation point formed by the lens will therefore scan a trajectory extending in a direction perpendicular to the direction 5. By cross-section fi to ί \ 〇 etc. will be continuously scanned The trajectories of the second, third, etc. This scan beam b from unit 10 and incident on a mirror cross-section lies on the plane defined by the scan beam from the polygon of the mirror and is at the center of the scan beam For example, extending at an angle of 3 8 degrees, the scanning beam is moved freely; for example, at an angle of 48 degrees. This object lens, in the form of f-Θ lens, has, for example .25 mm effective focal length and 0.45 numerical aperture. The scanning point can be moved in the vertical direction by a distance of, for example, 1 mm. In this way, it may be possible to lay in a direction that is 1 mm long in the direction perpendicular to the direction of the ribbon travel Printed by the Ministry of Economic Affairs, Central Bureau of Standards, Employee Consumer Cooperatives (please read the precautions on the back and then fill in this page). You can write some horizontal lines on the ribbon with vertical information. For this purpose, first Write a 1 mm long track from the beginning of the ribbon to the end. Then reverse the direction of travel of the ribbon, then the ribbon and the optical system will be displaced by a distance of more than 1 mm relative to each other, and then written vertically Another horizontal line of the track. In this way, 12 information tracks can be formed on a 12.7 mm wide ribbon. This device is also suitable for recording green 8 mm wide ribbons. Read the information written into the ribbon The effective method is similar to the writing method. Then the beam reflected by the ribbon will traverse the same optical path in the opposite direction of the radiation source detection unit. In the bucket unit, it is combined with an optical sound disc (CD ) The player obtains this information signal, focus error signal and tracking error signal in the same way. This paper scale is applicable to the Chinese National Standard (CN'S) A4 specification (210X 297 mm) Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs, Yinzhen 319854 A7 B7 5. Description of the invention () This radiation source detection unit includes a high-power diode laser with a wavelength of, for example, 780 nanometers. 3 If the object lens has a NA of 0.45, it will be available to compete with the optical disc system The resolution can be 1 bit / micron, and a 12.7 mm wide and 42 m long ribbon can contain 50 terabytes of information. The information density in the tracking direction is 0.6 micrometers / bit, so a track can contain approximately 1600 bits. The nominal rotation frequency of the mirror polygon is such as -200 rpm per second. Therefore, the scanning frequency of one mirror with one cross section and more than one polygon is 20 Hz. Under the condition of 1600 bits per track, a bit rate of 32 million per second can be obtained. The tracking period is as large as 丨. 6 microns. When the scanning frequency is 20 kHz, the speed of the ribbon during reading and writing will be 3.2 cm / sec. This is a fairly low speed, so there is no need for a very complicated Fen conveying mechanism. FIG. 2 shows a possible specific embodiment of the radiation source detection unit 10. This galaxy contains a radiation source in the form of a diode laser, which supplies a divergent beam b. This beam is converted from a collimator lens to a parallel beam, which is concentrated on the mirror polygon. In order to separate this beam b from the ongoing beam, this beam b will be reflected by the green carrier, and after passing through the object lens and the mirror polygonal first-time reflection for the second time, enter the collimator lens again 1 3 This unit is formed by a known method with a fold-back grating 12, which has the condition of diffracting most of the radiant energy of the returned beam to the detector 1-4 during the first diffraction. An image v 'of a radiation point V is formed on the detector. It can be understood that blaze refers to the slope of the wall surface of the groove of the foldback grating so that the ray is refracted by this wall surface at an angle equal to the angle of the diffracted ray leaving the foldback grating during the first diffraction β such as ____-8-CNS) A4 ^ (210 ^? ^-. ^ Seed coat. Order a line (please read the precautions on the back first and then fill out this page). M7 Central Bureau of Standards, Negative Work Consumer Cooperative Printed A7 _B7__ 1. Description of invention (6) Scrape As described in U.S. Patent No. 4,665,310, 'This folding back grating can be divided into two halves, where the direction of the folding back grating stripes are different. Then the beam b' is divided into two beams' and includes a pair of each Beam is used. The detector of the detector unit generates a focus error signal, that is, a signal indicating whether the focal point of the object lens is located on the plane of the scanning track on the ribbon. This signal can also be obtained by a Obtained from an undivided foldback grating with a nonlinear difference foldback grating period. Used in conjunction with a quarter detector, as described in US Patent No. 4,358,200. This foldback grating makes the beam into astigmatism, and the detector Can determine the detector The shape of the radiation spot, which is related to the range where the beam b is focused on the ribbon. Instead of using a folding grating, abundance transmission mirror or polarization-sensitive beam splitter and an arrangement on the beam splitter and object lens can also be used Between; 1/4 wave plate combination separates the forward and return beams, where A is the wavelength of the scanning beam. In order to obtain a trajectory error signal, two auxiliary beams can also be used. The scanning beam splits. These auxiliary beams will constitute the radiation points on the two edges of the path, and this radiation point is projected onto different detectors. The difference between the output signals supplied by these detectors is the tracking error signal. This signal has nothing to do with the nature of the information bits in the track. Because the cross section of the mirror polygon is parallel to the rotation axis of the polygon, such auxiliary points move along a line parallel to the path traversed by the scan point. Therefore, it can be used in the standard three-point trajectory system used in the light system. It should be> Wang Yi is that the radiation source detection unit shown in Figure 2 is only one possible specific embodiment. This unit can be borrowed CD Various methods known in the art can be modified. For example, for astigmatism focus error detection, it can be reflected in the reflected scanning beam. 9-This paper size is applicable to ϋϊϋ standard (CNS > A4 specification (2l〇x ^^---------- installed ------- order -----)) (Please read the precautions on the back before filling in this Page) _________ £ 7_ _________ £ 7_ The Ministry of Economic Affairs, Central Standard Falcon Bureau Employee Consumer Cooperative printed the A7 Five 'Invention Description (7) A cylindrical lens instead of an astigmatic refraction grating is arranged on the road technology. Foucault (Foucault can also be used) ) Detection method replaces astigmatism focus error detection. In this method, a rooftop wedge is used to split the scanning beam reflected by the ribbon into two beams, each combined with a detector pair. The position of each secondary east relative to its associated detector pair is a standard of focus. This trajectory error signal may not only be generated by two auxiliary points, but may also be generated only by the scanning beam, by splitting the detector used by this unit into two parts. By tracing these lacking signals of the detected parts with each other, this track error signal can be obtained. This method is known as the push-pull method. It can also be arranged in the actuator (not shown) with the coupling hook or the scanning lens 30, so that the lens can be moved in two directions, one for the focus setting and the other for the track. In order to define an average focus position, the ribbon can be conveyed via the guide element 4. However, because, for example, the thickness of the ribbon is the same, a low-frequency change in the distance between the ribbon information surface and the lens 30 can still occur: this can be compensated by the first movement, so the lens and ribbon surface It can be changed by making the focal plane of the lens always coincide with the information surface of the ribbon. 3 This focus control can have a very small I bandwidth. If the focal plane of the lens 30 is inclined with respect to the surface of the ribbon, it is necessary to perform -focus tilt correction. To achieve this goal ❾, the guide element 4 may have a tiltable function. When writing a blank ribbon, the object lens 30 can be fixed at a fixed position. This system has dog height and stability, and writes into a completely straight track with a fixed track period. No vibration of the same frequency as the scanning frequency will occur in this system. _____ 2J10- This paper scale is applicable to the Chinese National Standard (CNS) A4 specification (2 丨 ^ binding f (please read the precautions on the back before filling this page) Βί $ 854 Α7 --------- Β7 5 2. Description of the invention (8) When scanning the ribbon, the scanning point and the scanning trajectory may occur 7: cloth abundance (relative movement. The first species ribbon can only move along with the trajectory ... The length of the scanning path is chosen to be less troublesome than the trajectory. This ensures that the trajectory is always within the knowledge area. This is difficult for the private ^ _ 杪 动 义 The only political department has read the signal There will be a slight delay. The second undesirable difference in the speed of the ribbon (ィ ㈣ strip) is caused by these small differences. These differences may cause an average track error. During the reading and rewriting of the ribbon, this error It can be compensated by the second movement of the lens that may be caused by the key actuator printed by the Consumer Labor Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs, that is, the lens is yelling-parallel to the focal plane behind this lens, and preferably located Inside, it rotates. This axis has a parallel to the direction of the track In this way, in order to compensate for the trajectory error, the scanning path may be manually moved in a direction perpendicular to the direction of the trajectory. The third undesirable movement is caused by the inclination of the trajectory and the one relative to the scanning path. To compensate for this movement, the mirror polygon can be tilted by a corresponding method, and the scanning path can be tilted ΰ so that all irregular ribbon movements can be compensated by active servo control, so a micro Very precise belt-guiding system. The belt conveying mechanism is quite simple: the belt is conveyed directly from one round to the other only via the guide element 4. In order to be known from the belt The trajectory direction described by the trace point is consistent with the trajectory direction. According to the invention, the mirror polygon can be tilted, and its tilt axis is parallel to the main ray of the scanning beam b from the unit 10, as shown in FIG. 1 The rotation axis of the 'polygon' is represented by the number 3 5 and the tilt axis is represented by the number 4 0. The tilt axis can be selected to ensure the -11 described by the scan point v-This paper size applies National Standards (CNS) A4 specification (210X 297mm) M7 printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economy A7 ____B7 5. Description of invention (9) The trajectory always maintains a straight line. If, as shown in Fig. 1, the tilt axis The 40 series is consistent with the main rays of Dong 1>, when the polygon is inclined, the wearing face of the polygon will not change in a direction parallel to the rotation axis. The advantage is that the size of the wearing face and the direction The size of the mirror polygon does not need to be larger than the diameter of the beam b in the area of the wearing surface, then the polygon can be thin, so that its quality can be kept small, and the starting speed of the mirror polygon is faster and the rotation frequency is high 'In order to enable the above movement', the mirror polygon is electromagnetically moved and driven. The driving and moving unit 45 may be redundant as described in US Patent No. 5,171,984. This polygonal system can move in six degrees of freedom. These movements can be detested and corrected if necessary. The position detection system described in US Patent No. 5, M5, 182 can be used for this purpose. Using this system, the displacement along the three axes of the coordinate system, the right angle system, and the rotation around two of these axes can be measured. This system is combined with a mirror polygonal reflective surface 21 and a reflective spherical element 23 arranged in the center of this surface. This position detection system can also be completed as described in previous European patent applications (PHN 15.885) and (PHN 15.891) that have been previously filed by the same applicant and have not been published. If the polygonal surface 21 has at least one area 24 with different reflections from its surroundings, the rotation speed and angle of the polygonal axis 35 can be measured by these position detection systems. As already noted, the device according to the invention can also be used to read a previously written stripe green load, and to write and then read a blank stripe with $. The information layer of the last-mentioned ribbon can be a magneto-optical layer 'and the device should be shaped by magnetically magnetizing the ribbon area by a known method -12 -______ This paper scale is applicable to the Chinese National Standard (CNS ) A4 specification (210X297mm) ----- ^ --- II outfit ------ order ----- γ 诔 (please read the precautions on the back before filling in this page) V. Description of invention (1〇) A7 B7 to form areas opposite to the direction of magnetization around them. What's more, the unit 10 should be formed by a polarization sensitive detector by a known method. The ribbon can also use a phase change layer without using a magnetic layer, in which the information area is completed by changing the structure of the structure from amorphous to crystalline, and vice versa. In the ribbon used for reading only, the information can also be in the form of a small hole in the information layer 'similar to that in known CD audio discs 3 (please read the precautions on the back before filling this page, >; Pei. 5T Line Ministry of Economic Affairs Central Standardization Bureau, one Beigong Consumers f cooperation Du Printing -13- Table paper scale is applicable to China National Standards (CNS) / U specifications (2) 〇297297