1271729 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種光學讀取頭’特別關於一種能讀取 穿透蜇光資訊儲存媒體之光學讀取裝置及其光學讀取頭。 【先前技術】 隨著資訊與多媒體時代的來臨’消費者對於儲存媒體 容量的需求急遽地增加。其中，由於光資訊儲存媒體可以 儲存大量的資料，並具有可攜帶性以及能夠長久保存資料 之特性，使得利用光資訊儲存媒體來存取資料已經是相當 普及的方式。 現今常見的光資訊儲存媒體包括光碟（CD，C〇mpact Disc)以及數位影音光碟（DVD，Digital Versatile Disc)， 兩者結構均包含一記錄層與一反射層，記錄層係利用記錄 溝槽來記錄資料’當一光學讀取設備進行讀取資料時，光 學讀取設備係發射一雷射光聚焦於記錄層，光資訊儲存媒 體之反射層則提供將雷射光反射而返回光學讀取設備中 之一像檢出元件（Photodetector)，以將雷射光轉換為可辨識 處理的電訊號而完成資料之讀取。 承上所述，習知之光資訊儲存媒體係利用雷射光照射 於記錄層之記錄、/冓槽，藉由雷射光被反射之強弱程度不同 而轉為熟知之〇、1訊號，然而，就上述藉由反射雷射光 以得到光資訊儲存媒體資訊的機制來說，由於反射之雷射 光至像檢出元件之路徑上需經過光資訊儲存媒體之數層 1271729 用雷射光反射之機制而可得到資訊的光資訊儲存媒體，舉 例來况’ τ藉由光資訊儲存媒體之記錄層的㈣變化，以 ^構，而通過數層介質之雷射光會被吸 號變弱影響了資料之判讀，因而，為了確保得到較佳之讀 取祝號’疋以提高發射雷料之功率錢善，然而此舉在 長期使用下又會降低了發射雷射光之光學讀取頭的使用 壽命，爰ϋ如此，光資tKf轉媒财者致力於研發不需利1271729 IX. Description of the Invention: [Technical Field] The present invention relates to an optical pickup head, particularly to an optical reading device capable of reading a light-transmissive information storage medium and an optical pickup thereof. [Prior Art] With the advent of the information and multimedia era, consumer demand for storage media capacity has increased dramatically. Among them, the optical information storage medium can store a large amount of data, and has the characteristics of portability and long-term preservation of data, so that it is quite popular to use optical information storage media to access data. Commonly used optical information storage media include a compact disc (CD, C〇mpact Disc) and a digital video disc (DVD, Digital Versatile Disc), both of which comprise a recording layer and a reflective layer, and the recording layer utilizes a recording groove. Recording data 'When an optical reading device reads data, the optical reading device emits a laser beam to focus on the recording layer, and the reflective layer of the optical information storage medium provides reflection of the laser light and returns to the optical reading device. A photodetector is used to read the data by converting the laser light into a recognizable electrical signal. As described above, the conventional light information storage medium uses laser light to illuminate the recording layer/recording groove of the recording layer, and is converted into a well-known 〇, 1 signal by the difference in the intensity of the reflected light of the laser light. By reflecting the laser light to obtain the information of the optical information storage medium, the information can be obtained by the mechanism of reflecting the laser light from the reflected light to the image detecting medium through the layer 1271729 of the optical information storage medium. The light information storage medium, for example, is changed by the (four) change of the recording layer of the light information storage medium, and the laser light passing through the plurality of layers of media is weakened by the sucking number, thereby affecting the interpretation of the data. In order to ensure a better reading of the wish number '疋 to improve the power of the launching mine, but this will reduce the service life of the optical pickup that emits laser light under long-term use, so tKf mediators are committed to research and development without interest
利用例如穿透式之讀取方式，來調變雷射光以達得到〇與 1訊號之目的。 然而，為因應上述不需利用雷射光反射之機制而可得 資訊的穿透型光資訊儲存媒體的研發，相對應之光學讀取 s又備以及其中之光學讀取頭同時也需因應而生，爱因如 此，本發明人本著積極研發之精神，亟思一種能夠讀取穿 透裂光資訊儲存媒體的Γ光學讀取裝置及其光學讀取 頭」’以嘉惠世人。 【發明内容】 ，於上述課題，本發明之目的為提供—種能夠讀取 穿透=資訊儲存媒體之光學讀取褒置及其光學讀取頭。 、疋為達上述目的，依據本發明之一種光學續取 二取一光資訊儲存媒體，光資訊儲存媒體係 U牙透式_層，光學讀取頭包含—光源、—第 化兀件、、：第一物鏡、一像檢出單元以及-第二物鏡。复 中光源係發射一光束；第一極化元件係將光束偏極化為 6 1271729 一線偏振光；第一物鏡係將線偏振光聚焦於穿透式記錄 層’並穿透過光資訊儲存媒體形成一穿透光；像檢出單元 係接收通過第二物鏡聚焦之穿透光，並將穿透光轉換為一 相對應於資料信號之電訊號。 為達上述目的，依據本發明之一種光學讀取裝置，其 係用以讀取一光資訊儲存媒體，光資訊儲存媒體係包含一 穿透式記錄層，光學讀取裝置包含一光學讀取頭、一控制 ❿單元以及一訊號處理單元。其中，光學讀取頭包含一光 源、一第一極化元件、一第一物鏡、一第二物鏡以及一像 檢出單元，光源係發射一光束，第一極化元件係將光束偏 極化為一線偏振光，第一物鏡係將線偏振光聚焦於穿透式 記錄層，並穿透過光資訊儲存媒體形成一穿透光，像檢出 單元係接收通過第二物鏡聚焦之穿透光，並將穿透光轉換 為一相對應於資料信號之電訊號；控制單元係改變光學讀 取頭與光資訊儲存媒體之相對位置；訊號處理單元係處理 φ光學讀取頭傳出之電訊號以取得光資訊儲存媒體之資訊。 承上所述，因依據本發明之光學讀取裝置及其光學讀 取頭係用以讀取穿透型光資訊儲存媒體，特別是具有光碉 變物質記錄層之光資訊儲存媒體，此光學讀取頭利用一第 一極化元件在光資訊儲存媒體(例如光碟）之讀取面一側， 將光束偏極化為線偏振光(linearly p〇larized light)，而在光 資訊儲存媒體之另一侧偵測光訊號，穿透型光資訊儲存媒 體即可利用光調變物質例如調變線偏振光之旋轉角度來、 產生讀取信號，以達到讀取穿透型光資訊儲存媒體2目 1271729 的0 【實施方式】 以下將參照相關圖式，說明依據本發明較佳實施例之 光學項取裝置及其光學讀取頭，其中相同的元件將以相同 的參照符號加以說明。 請參照圖1所示，依據本發明較佳實施例之光學讀取 頭10包含一光源11、一第一極化元件12、一第一物鏡13、 一弟一物鏡15以及一像檢出單元14，用以讀取一光資訊 儲存媒體20，特別是包含一穿透式記錄層201之光資訊儲 存媒體20。 光源11係發射一光束作為入射光束，在本實施例中 光源11係可為雷射發光二極體(Laser Diode)，光束之波長 可依據實際需要選擇例如冗加瓜或65〇nm等來讀取光資 訊儲存媒體20。 第一極化元件12例如可為一偏光板(polarizer),用以 將光束偏極化為一線偏振光(Hnearly p〇larize(J ，即是 使光固定於一平面上振動。 第一物鏡13係設置於光資訊儲存媒體20之一侧面且 位於線偏振光的路徑上，用以將線偏振光聚焦於光資訊儲 存媒體20之穿透式記錄層201上，舉例來說，此穿透式 吕己錄層201可以包含一例如旋光性物質之光調變物質來使 光之振動平面旋轉，藉由穿透式記錄層201記錄資訊之執 跡深淺不同’造成聚焦於其上之光被旋轉之角度亦不同的 1271729 機制，而產生可分辨之讀取信號。其中，第一物鏡13之 數值孔徑（Numerical Aperture)可以約為0·60或是約為〇·4〇 至0.50之間來決定讀取光點的大小，因此可視實際之需 要，例如當讀取之光資訊儲存媒體2〇為DVD之凹槽規格 時可選用數值孔徑為0·60之第一物鏡13，當讀取之光資 訊儲存媒體20為CD之凹槽規格時可選用數值孔徑為〇.的 至0.50之第一物鏡13，此僅為舉例性，當然亦可依據不 #同光資訊儲存媒體20之凹槽規格選用不同數值孔徑之第 一物鏡13 〇 如圖1所示，用以讀取資訊之線偏振光係穿透過光資 訊儲存媒體20形成一穿透光，由位於光資訊儲存媒體2〇 另侧之第二物鏡15聚焦並由像檢出單元14接收。 像檢出單元14係包含一第二極化元件141與一偵測 兀件142，第二極化元件141係設置於穿透過光資訊儲存 ，體20之—穿透光的路徑上並位於偵測元件142之前， 鲁第一極化元件141接收帶有資料訊號之穿透光，而分別出 光波某一向量之強度，再經由偵測元件142藉由光強度之 ，同轉換為一可辨識處理且相對應於資料信號之電訊 號用以得到光資訊儲存媒體20之記錄資料。 又，如圖2所示，依據本發明較佳實施例之光學讀取 貝〇更包含一準直透鏡16(Collimator lens)設置於光源11 與第一極化元件12之間，用以將光源11發射之光束平行 處理為一平行光束。 承上所述，本發明較佳實施例之光學讀取頭更可 9 1271729 包含一第三物鏡17設置於像檢出單元η中第二極化元件 141與偵測元件142之間。 另外，請參照圖3所示，依據本發明較佳實施例之光 學讀取裝置1，包含一光學讀取頭1〇、一控制單元3〇以 及一訊號處理單元40,此光學讀取裝置i係應用於讀取一 光為訊儲存媒體20，特別是包含一穿透式記錄層2〇1之光 資訊儲存媒體20。 光學讀取頭10之結構係如上所述之應用，故不再贅 述。 控制單元30則係用以改變光學讀取頭1〇與光資訊儲 存媒體20之相對位置，控制單元3〇可以包含一馬達 以及-驅動元件302，馬達301用以旋轉光資訊儲存媒體 20，驅動元件302用以移動光學讀取頭1〇，來進行聚焦與 追蹤的位置控制。 ' 電路板，用以處理光學 資訊儲存媒體2〇之資 訊號處理單元40則可包含一The use of, for example, a transmissive reading method to modulate the laser light for the purpose of obtaining a chirp and a signal. However, in order to develop the transmissive optical information storage medium that can obtain information without using the mechanism of laser light reflection, the corresponding optical reading s and the optical reading head therein also need to be adapted accordingly. In this way, the inventor in the spirit of active research and development, thinking about a Γ optical reading device capable of reading through the cracking information storage medium and its optical reading head "" to benefit the world. SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide an optical reading device capable of reading a penetration = information storage medium and an optical pickup thereof. According to the present invention, an optical continuation takes two optical information storage media, and the optical information storage medium is a U-transparent _ layer, and the optical pickup includes a light source, a grading element, and : a first objective lens, an image detection unit, and a second objective lens. The complex medium light source emits a light beam; the first polarization element polarizes the light beam to 6 1271729 linearly polarized light; the first objective lens focuses the linearly polarized light on the transmissive recording layer and penetrates the light information storage medium to form a penetrating light; the image detecting unit receives the penetrating light focused by the second objective lens and converts the penetrating light into an electrical signal corresponding to the data signal. To achieve the above object, an optical reading device according to the present invention is for reading an optical information storage medium, the optical information storage medium comprising a transmissive recording layer, and the optical reading device comprising an optical reading head , a control unit and a signal processing unit. The optical pickup includes a light source, a first polarization element, a first objective lens, a second objective lens, and an image detection unit. The light source emits a light beam, and the first polarization element polarizes the light beam. For linearly polarized light, the first objective lens focuses the linearly polarized light on the transmissive recording layer and penetrates the light information storage medium to form a transmitted light, and the image detecting unit receives the transmitted light focused by the second objective lens. And converting the transmitted light into a signal corresponding to the data signal; the control unit changes the relative position of the optical pickup to the optical information storage medium; and the signal processing unit processes the electrical signal transmitted by the φ optical pickup to Get information about optical information storage media. According to the above, the optical reading device and the optical reading head thereof according to the present invention are used for reading a transmissive optical information storage medium, in particular, an optical information storage medium having a photo-deformable substance recording layer, the optical The read head uses a first polarization element to polarize the beam to linearly p〇larized light on the side of the reading surface of the optical information storage medium (eg, a compact disc), and in the optical information storage medium The other side detects the optical signal, and the transparent optical information storage medium can use the optical modulation substance, for example, to adjust the rotation angle of the linearly polarized light to generate a read signal, so as to reach the read-through optical information storage medium 2 [Embodiment] The optical item pick-up apparatus and the optical pickup head thereof according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings, wherein the same elements will be described with the same reference numerals. Referring to FIG. 1 , an optical pickup 10 according to a preferred embodiment of the present invention includes a light source 11 , a first polarization element 12 , a first objective lens 13 , a first objective lens 15 , and an image detection unit . 14. An optical information storage medium 20 for reading an optical information storage medium 20, in particular, a transmissive recording layer 201. The light source 11 emits a light beam as an incident light beam. In this embodiment, the light source 11 can be a laser diode (Laser Diode), and the wavelength of the light beam can be selected according to actual needs, such as redundancy or 65 〇 nm. The light information storage medium 20 is taken. The first polarizing element 12 can be, for example, a polarizer for polarizing the light beam into a linearly polarized light (HNearly p〇larize), that is, the light is fixed to a plane to vibrate. The first objective lens 13 Is disposed on one side of the optical information storage medium 20 and located on the path of the linearly polarized light for focusing the linearly polarized light on the transmissive recording layer 201 of the optical information storage medium 20, for example, the transmissive type The Luchen recording layer 201 may comprise a light-modulating substance such as an optically active substance to rotate the plane of vibration of the light, and the depth of the record recorded by the transmissive recording layer 201 is different, causing the light focused thereon to be rotated. The angle is also different from the 1271729 mechanism, and a resolvable read signal is generated, wherein the numerical aperture of the first objective lens 13 can be determined to be between about 0.60 or about 〇·4〇 to 0.50. The size of the spot is read, so that it can be visually needed. For example, when the read light information storage medium 2 is a groove size of the DVD, the first objective lens 13 having a numerical aperture of 0·60 can be selected, when the light is read. Information storage medium 20 is a groove of CD In the specification, the first objective lens 13 with a numerical aperture of 〇. to 0.50 can be selected, which is merely exemplary. Of course, the first objective lens 13 with different numerical apertures can be selected according to the groove specification of the non-co-light information storage medium 20. As shown in FIG. 1, the linearly polarized light for reading information penetrates the light information storage medium 20 to form a transmitted light, which is focused by a second objective lens 15 located on the other side of the optical information storage medium 2 and detected by the image. The image detecting unit 14 includes a second polarizing element 141 and a detecting element 142. The second polarizing element 141 is disposed in the through-light information storage, and the path of the body 20 that penetrates the light. Before being located in the detecting component 142, the Lu first polarizing component 141 receives the transmitted light with the data signal, and respectively outputs the intensity of a vector of the optical wave, and then converts the light intensity through the detecting component 142. The audible signal corresponding to the data signal is used to obtain the recorded data of the optical information storage medium 20. Further, as shown in FIG. 2, the optical reading cassette according to the preferred embodiment of the present invention further comprises a Collimator lens 16 Between the light source 11 and the first polarizing element 12, the light beam emitted by the light source 11 is processed into a parallel beam in parallel. As described above, the optical pickup of the preferred embodiment of the present invention can further comprise 9 1271729 A third objective lens 17 is disposed between the second polarization element 141 and the detection element 142 in the image detecting unit η. In addition, referring to FIG. 3, the optical reading device 1 according to the preferred embodiment of the present invention, The invention comprises an optical reading head 1 , a control unit 3 , and a signal processing unit 40 , wherein the optical reading device is used for reading a light as the storage medium 20 , in particular comprising a transmissive recording layer 2 . 〇1 Light Information Storage Media 20. The structure of the optical pickup 10 is as described above and will not be described again. The control unit 30 is used to change the relative position of the optical pickup 1 to the optical information storage medium 20. The control unit 3 can include a motor and a driving component 302 for rotating the optical information storage medium 20 to drive The component 302 is used to move the optical pickup 1 to perform position control of focusing and tracking. a circuit board for processing the optical information storage medium 2, the signal processing unit 40 may include a
讀取頭10傳出之電訊號以取得光 訊。 録上所述 水 平又狂貫施例之光學讀取裝置及 其光學讀取頭’光學讀取頭係利用位於光資訊 -侧的-第-極化科將光源發射之光束偏極化為線偏 振光，纽線偏振光⑽過具有相變物f之光資 媒體時’藉由光調變物質調變（例如· 、:予 生不同之讀取訊號，再藉由位於光二，偏振光來產 像檢出元件將帶有資訊之讀取訊_° π存職另一側之 轉為可辨識處理之電 1271729 訊號，將此光學讀取頭應用於一光學讀取裝置，搭配控制 單元作資訊讀取之位置控制以及訊號處理單元處理光學 讀取頭傳出訊號以完成資料之讀取，藉此發明，可有效改 善習知讀取反射型光資訊儲存媒體時讀取二號削弱之問 題，可得較佳之讀取訊號’並且_提高鮮讀取頭之使 用哥命。 以上所述僅為舉例性，而非為限制性者。任何未脫離 參之精神與_，而對其進行之等效修改或變更，均 應包3於後附之申請專利範圍中。 【圖式簡單說明】 一圖1為一顯不依據本發明較佳實施例之光學讀取頭的 示意圖； 圖2為一顯示依據本發明另一較佳實施例之光學讀取 頭的示意圖；以及 圖3為一顯示依據本發明較佳實施例之光學讀取裝置 的示意圖。 元件符號說明： I 光學讀取裝置 10 光學讀取頭 II 光源 12 第一極化元件 13 第一物鏡 11 像檢出單元 第二極化元件 偵測元件 第二物鏡 準直透鏡 第三物鏡 儲存媒體 穿透式記錄層 控制單元 馬達 驅動元件 訊號處理單元 12The electrical signal transmitted from the head 10 is read to obtain the optical signal. The optical reading device of the horizontal and mad embodiment and the optical pickup of the optical reading head are optically polarized into a line by a light-information-side-polarization section. Polarized light, when the linearly polarized light (10) passes through the optical medium with the phase change material f, 'is modulated by the light-modulating substance (for example, :: a different read signal, and then by the light, polarized light The image detection device converts the information from the other side to the identifiable processing electric 1271729 signal, and applies the optical reading head to an optical reading device, which is matched with the control unit. The position control of the information reading and the signal processing unit process the optical pickup to transmit the data to complete the reading of the data, thereby inventing the problem that the conventional reading of the reflective optical information storage medium can be improved. A better read signal can be obtained and the use of the fresh read head can be improved. The above description is for illustrative purposes only and is not a limitation. Any one that does not deviate from the spirit and the _ Equivalent modifications or changes shall be included in the package BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing an optical pickup according to a preferred embodiment of the present invention; FIG. 2 is a view showing an optical according to another preferred embodiment of the present invention. Schematic diagram of a read head; and Figure 3 is a schematic view showing an optical reading device in accordance with a preferred embodiment of the present invention. Description of the components: I Optical reading device 10 Optical pickup II Light source 12 First polarization element 13 First objective lens 11 image detecting unit second polarization element detecting element second objective lens collimating lens third objective lens storage medium transmissive recording layer control unit motor driving element signal processing unit 12