200540824 九、發明說明： 【發明所屬之技術領域】 本發明一般係關於光碟機，更特定言之係關於用於光碟 機之光學拾取單元的光學元件。 【先前技術】 光學資訊記錄已發展為高密度記錄方法。光學儲存媒體 係以碟片或卡的形式。傳統光學儲存媒體驅動裝置具有： 用以發射光束的光源（例如雷射）、用以引導光束的光學系 、、先用以聚焦光束於儲存媒體之表面上的聚焦透鏡、以及 用以將從儲存媒體之表面反射的光束轉換成電氣信號的光 偵測器。 參考圖式之圖1A及1B，其解說依據先前技術之DVD拾取 單元之主要組件之示意平面圖及側視圖。如圖所示，所解 說的DVD拾取單元包括··雷射二極體115、光柵114、光偵 測器預放大積體電路1C 110、分光器m、準直透鏡112、物 鏡113、折疊鏡116與偏光器117。 在操作中，雷射二極體115產生雷射束，其接著穿過光柵 114至分光器lu。在分光器U1中，雷射束之一部分係反射 至準直裔112並由該準直器加以校準。從準直器i 12校準的 光係接著由折疊鏡116反射至偏光器丨丨7。從偏光器j丨7輸出 的光係接著由物鏡113聚焦至所讀取的光碟（圖中未顯示)之 貝Λ表面上。從光碟（圖中未顯示）反射的光接著在相反方向 上透過偏光器117、折疊鏡及準直器112傳導至分光器1U。 在分光器中，反射光之一部分透過分光器直接透射至光偵 100031.doc 200540824 於反射光，光偵測器預放 其可以傳統方式加以處理 測器預放大器ic 110。為了回應 大器1C 110產生許多光電信號， 以取回儲存在光碟上的資料。 目前極欲產生盡可能小型 一々 1的先學拾取早兀OPU，並且丰 兩或細長OPU正曰益普遍 + h ^ …、而，對於某些應用而言，習 口勺PU係考量為太厚。此 以ΊΓ室每H 得、、充先碟機在結構上由於200540824 IX. Description of the invention: [Technical field to which the invention belongs] The present invention generally relates to an optical disc drive, and more specifically, relates to an optical element of an optical pickup unit used in the optical disc drive. [Prior art] Optical information recording has been developed as a high-density recording method. Optical storage media are in the form of discs or cards. A conventional optical storage medium driving device has a light source (such as a laser) for emitting a light beam, an optical system for guiding the light beam, a focusing lens for focusing the light beam on the surface of the storage medium, and a secondary lens A light detector that converts a light beam reflected from the surface of a medium into an electrical signal. Reference is made to Figures 1A and 1B, which illustrate schematic plan and side views of the main components of a DVD pickup unit according to the prior art. As shown, the illustrated DVD pickup unit includes a laser diode 115, a grating 114, a photodetector pre-amplification integrated circuit 1C 110, a beam splitter m, a collimator lens 112, an objective lens 113, and a folding mirror 116 与 Polarizer 117. In operation, the laser diode 115 generates a laser beam, which then passes through the grating 114 to the beam splitter lu. In the beam splitter U1, a part of the laser beam is reflected to the collimator 112 and calibrated by the collimator. The light system collimated from the collimator i 12 is then reflected by the folding mirror 116 to the polarizer 7. The light output from the polarizer j 7 is then focused by the objective lens 113 onto the surface of the read optical disc (not shown). The light reflected from the optical disc (not shown) is then transmitted to the beam splitter 1U through the polarizer 117, the folding mirror, and the collimator 112 in the opposite direction. In the beam splitter, a part of the reflected light is transmitted directly to the light detector through the beam splitter. 100031.doc 200540824 For the reflected light, the photodetector preamplifier can be processed in a conventional manner. The detector preamplifier ic 110. In response to the large 1C 110, many optical signals are generated to retrieve the data stored on the disc. At present, I want to produce as small as possible, and pick up early OPUs, and the two or slender OPUs are generally beneficial + h ^, and for some applications, the consideration of the PU spoon of the spoon is too thick. . Therefore, the structure of the pre-disc player for each H in the ΊΓ chamber is
學功 早先子組件可以僅提供單一光 二彳如’將折疊鏡僅m射人射至其 他方向，而將準直器僅用以P、、隹办 ^ ^ ^ 用以权準穿過其中的光。結果，椹 成光學拾取單元的光學組件 留一, 什之…數里較大，從而增加拾取 Γ學系統之結構複雜性，並且導致限制了使咖較 =產:及增加材料及製程之成本，並且由於以下因素而 合成處理設傷、膠合操作及人力。 所而要之 【發明内容】 現已提出改良式配 光學驅動系統之光學 對於先前配置而減小 置，並且本發明之一目的係提供用於 拾取單元的光學元件，該系統能夠相 光學拾取單元之高度/大小。 依據本發明提供一 具包括具有第一及第二輻 、、、“表面及内部輻射反射表面的稜鏡，該等第一及第 一平表面具有個別第一及第二非球面透鏡，透過該等透 鏡幸田射可分別地進入該稜鏡、從内部輻射反射表面反射 並且離開該稜鏡，該等第—及第二非球面透鏡 準該輻射。 j ^ 100031 .doc 200540824 因此’將折疊鏡與準直透鏡結合在單一個組件中。此可 減/貫現光學拾取單元所需要的組件之數量，從而相對於 先刖技術配置而減小其高度/大小，此對於繼續努力製造包 含光學驅動系統之較小及更小型平台而言比較重要。此 外可以減J材料之成本、處理成本及生產期間所需要的 循環時間。 在本發明之一項範例性具體實施例中，將非球面透鏡與 棱鏡之第一及第二平表面一體形成。或者，可將透鏡附於 平表面。稜鏡較佳係以半立方反射鏡的形式，其中將非球 面透鏡提供在實質上彼此為直角的第一及第二平表面上， 而將反射表面提供在半立方反射鏡之斜邊側上。 在項範例性具體實施例中，以上定義的光學元件可形 成於實質立方分光器中，並且具有包括飼服透鏡的第三平 表面。第三平表面較佳具有實質圓柱形狀。 在另一具體實施例中，光學元件可包含光偵測器及/或輕 射源。 本發明引伸為包含以上定義的光學元件之光學拾取單 元，以及包含此類光學拾取單元的光學驅動系統。 參考本文所說明的具體實施例闡明並且明白本發明之該 等及其他方面。 【實施方式] 一參考圖式之圖2,依據本發明之第一範例性具體實施例的 光學π件10本質上包括結合的折疊鏡與準直透鏡，其由具 有第-及第二輕射透射平表面】4、與斜邊表面17的半立 100031.doc 200540824 方反射鏡組成，該斜邊丰 针遭表面係採用反射材料塗佈以便其能 夠反射入射在其上的雷射蚩 田耵采弟一及第二輻射平表面具有 個別第一及第二雙凸非純 又凸#球面透鏡18、2〇，其共同具有用以 校準自光源的發散光束之準直器之功能。 包含此類光學元件的光學驅動系統包括如上述的雷射二 極體22刀光杰24(其可按需要而偏光或不偏光）與光摘測器 預放大器1C 26。 因此，將u技術配置之折疊鏡與準直透鏡結合至依據 本發明之上述範例性具體實施例之單—光學元件中。結 果可以&步減小傳統半高或細長〇阳之高度。此外， 因為相對於先前技術光學驅動系統而有效㈣除一個組 件’所以可減少材料及處理成本，與生產期間的循環時間。 ,參考圖式之圖3,依據本發明之另—範例性具體實施例的 光子兀件30本貝上包括結合的（或偏光）分光器、可選祠服透 鏡、折疊鏡與準直透鏡，其由具有第一及第二輕射透射平 表面與内部斜邊表面37的立方分光器組成，該斜邊表面係 採用反射材料塗佈以便其能夠反射入射在其上的雷射束。 第一及第二輻射平表面具有個別第一及第二雙凸非球面透 ，18、20’其共同具有用以校準自光源的發散光束之準直 器之力月b内。p斜邊表面37之反射材料能夠透過第一非球 » Μ (圖中未顯示）反射的光之一部分透射至光 偵測器預放大器1C 26。 匕外立方刀光裔之第二平表面具有特殊形狀（即圓柱型 形狀）表面40，其作為伺服透鏡用以產生聚焦錯誤信號，如 100031.doc 200540824 熟習此項技術者所明白。 纟包含整合模組(例如以上參考圖式之圖3所說明的模組) 之光學驅動系統中，其進一步包括如以上的光偵測器預放 大裔1C 26及雷射二極體22。依據本發明之此範例性具體實 施例的整合模組使合成〇PU變小，此在小型平台之發展中 比較重要。小型平台可依次用於探索在（例如）行動電話等之 領域中探查進一步的應用。此外，新的設計可減少所需要 φ 的組件之數量，從而減少材料及處理成本，並且改進0PU 可靠性。 此外，在本發明之另一範例性具體實施例中，還可以將 雷射二極體及/或光偵測器預放大器IC整合至光學元件 中，以形成更整合的裝置。 將圖2或圖3所描述的光學元件整合至光碟機之光學拾取 單凡中，特定言之該光學拾取單元包括物鏡。基本上，可 以將物鏡用以校準發散光束，然而可以將準直透鏡用以聚 • 焦平行光束，如在自光學拾取單元中的碟片之向後光路徑 上所看見。在本發明之準直透鏡與先前技術之物鏡之間存 在某些差異，其在於： (1)因為碟片上的光束點之所需的大小/形狀，所以尤其對 於向前光路徑而言，應嚴格控制波前像差。因為準直透鏡 之功能（即校準）不同於物鏡之功能（聚焦），所以透鏡之幾何 組態不同。傳統上，對於準直透鏡而言，前表面之頂點處 的彎曲半徑（絕對值）係（遠遠）大於後表面之頂點處的彎曲 半徑，而相反情況同樣適合於物鏡； 10003 i.doc -10· 200540824 (2)物鏡之數值孔徑ΝΑ幾乎為標準並且較大，例如對於 CD而言ΝΑ=0.43而對於DVD而言ΝΑ=0·6，雖然準直透於之 ΝΑ更為可變並且較小，此使準直透鏡之設計（表面之曲率半 徑、形狀/圖案）與製造（塗佈/模製）更加容易，因此產量及品 質會較佳。 在光學拾取單元中，準直透鏡始終係最接近於折疊鏡， 雖然準直透鏡可以在折疊鏡的前面或後面，而在某些情況 φ 下，將準直透鏡定位在物鏡與折疊鏡之間。因此，結合折 疊鏡與準直透鏡，比結合折疊鏡與物鏡更為適用，以便使 光學拾取單元更為小型。此外，稜鏡型物鏡比較重，因此 對驅動器之靈敏性及動力造成不利影響。 應〉主意，上述具體實施例係解說而非限制本發明，熟習 此項技術者能夠設計許多替代具體實施例，而不脫離^附 申請專利範圍定義的本發明之範疇。在申請專利範圍中， 任何置於括號中的參考符號均不應視為限制申請專利範 圍I吾「包括」及「包含」與類似詞語不排除出現除總 體上列舉在任何請求項或說明中的元件或步驟以外之元件 或步驟。㈣之單數參考不排除此類元件之複數參考，反 ::、、依罪包括數個截然不同的元件之硬體，及依靠適 田=式化之電腦’可以實施本發明。在列舉數個構件的裝 、員中彳藉由硬體之-個且相同的項目具體化該等 旦件之數個。在互不相同的相關申請專利範圍中對特定度 里加以陳述之僅有拿每 惶有爭只，並不指不不能有利地使用該虺度 量之組合。 一& 100031.doc 200540824 【圖式簡單說明】 僅經由範例並且參考附圖而說明本發明之具體實施例， 其中： 圖1A及1B分別為依據先前技術之光學拾取單元之示意 平面圖及側視圖； 圖2為解說依據本發明之第一範例性具體實施例的光學 驅動系統之主要組件的示意圖；以及Earlier sub-components of Xuegong can only provide a single light, such as' shoot the folding mirror only to other directions, and use the collimator only for P ,, 隹 ^ ^ for the right to pass through the light . As a result, the optical components of the optical pick-up unit are left alone, and the number of miles is large, which increases the structural complexity of the pick-up system, and results in limiting the cost of manufacturing and increasing the cost of materials and processes. And due to the following factors, synthetic treatment of injury, glue operation and manpower. SUMMARY OF THE INVENTION [Summary of the Invention] It has been proposed that an improved optical drive system equipped with an optical drive system is reduced in size from a previous configuration, and an object of the present invention is to provide an optical element for a pickup unit, which system can be compared with an optical pickup unit. Height / size. According to the present invention, there is provided a plutonium having first and second spokes, a "surface, and an internal radiation reflecting surface. The first and first flat surfaces have individual first and second aspheric lenses through which When the lens Koda shot can enter the ridge separately, reflect from the internal radiation reflecting surface and leave the ridge, the first and second aspherical lenses collimate the radiation. J ^ 100031.doc 200540824 Therefore 'the folding mirror and The collimating lens is combined in a single component. This reduces / implements the number of components required by the optical pickup unit, thereby reducing its height / size compared to prior art configurations. Smaller and smaller platforms are more important. In addition, the cost of J material, processing costs, and cycle time required during production can be reduced. In an exemplary embodiment of the present invention, an aspheric lens and a prism are used. The first and second flat surfaces are integrally formed. Alternatively, the lens can be attached to the flat surface. 稜鏡 It is preferably in the form of a half-cube mirror, in which an aspherical surface The mirror is provided on the first and second flat surfaces that are substantially at right angles to each other, and the reflective surface is provided on the hypotenuse side of the half-cubic mirror. In the exemplary embodiment of this item, the optical element defined above may be formed In a substantially cubic beam splitter, and having a third flat surface including a feeding lens. The third flat surface preferably has a substantially cylindrical shape. In another embodiment, the optical element may include a light detector and / or a light detector. The invention extends to an optical pickup unit including the optical elements defined above, and an optical drive system including such an optical pickup unit. These and other aspects of the invention are illustrated and understood with reference to the specific embodiments described herein. [Embodiment] Referring to FIG. 2 of the drawings, the optical π member 10 according to the first exemplary embodiment of the present invention essentially includes a combined folding mirror and a collimating lens, which are provided with first and second light beams. Transmissive flat surface] 4. It is composed of a half mirror 100031.doc 200540824 with a beveled surface 17. The beveled needle is coated with a reflective material on the surface so that it can Lasers that can reflect the incident incident on them. The first and second radiation flat surfaces of the Putian and Caidi have individual first and second biconvex non-pure and convex #spherical lenses 18 and 20, which have a common self-light source for calibration. The function of the collimator for diverging light beams. The optical drive system including such optical elements includes the laser diode 22 as described above, and the laser diode 24 (which can be polarized or unpolarized as required) and the optical pick-up detector. Amplifier 1C 26. Therefore, a folding lens and a collimating lens configured by u technology are combined into the single-optical element according to the above-mentioned exemplary embodiment of the present invention. As a result, the conventional half-height or slenderness can be reduced by steps. In addition, because it effectively eliminates a component compared to the prior art optical drive system, it can reduce material and processing costs and cycle time during production. Referring to FIG. 3 of the drawings, a photonic element 30 according to another exemplary embodiment of the present invention includes a combined (or polarized) beam splitter, an optional temple lens, a folding mirror, and a collimating lens. It consists of a cubic beamsplitter with first and second light transmission flat surfaces and an inner beveled surface 37, which is coated with a reflective material so that it can reflect the laser beam incident on it. The first and second radiating flat surfaces have individual first and second biconvex aspheric surfaces, 18, 20 'which together have within the force b of the collimator used to calibrate the divergent beam from the light source. The reflective material of the p-beveled surface 37 can transmit a portion of the light reflected by the first aspheric »M (not shown) to the light detector preamplifier 1C 26. The second flat surface of the dagger cuboid has a special shape (ie, a cylindrical shape) surface 40, which is used as a servo lens to generate a focus error signal, as 100031.doc 200540824 is familiar to those skilled in the art.光学 In an optical drive system including an integrated module (such as the module described above with reference to Figure 3 of the drawings), it further includes a photodetector preamplifier 1C 26 and a laser diode 22 as described above. The integration module according to this exemplary embodiment of the present invention makes the synthesis OFDM smaller, which is more important in the development of small platforms. Small platforms can in turn be used to explore further applications in areas such as mobile phones. In addition, the new design reduces the number of φ components required, thereby reducing material and processing costs, and improving 0PU reliability. In addition, in another exemplary embodiment of the present invention, a laser diode and / or a photodetector preamplifier IC may be integrated into the optical element to form a more integrated device. The optical element described in FIG. 2 or FIG. 3 is integrated into the optical pickup unit of the optical disc drive, and specifically, the optical pickup unit includes an objective lens. Basically, an objective lens can be used to calibrate a diverging beam, but a collimating lens can be used to focus a parallel beam, as seen on the rear light path of a disc in an optical pickup unit. There are some differences between the collimating lens of the present invention and the objective lens of the prior art, which are: (1) Because of the required size / shape of the beam spot on the disc, especially for the forward light path, Wavefront aberrations should be strictly controlled. Because the function of collimating lens (ie, calibration) is different from that of objective lens (focusing), the geometric configuration of the lens is different. Traditionally, for a collimating lens, the bending radius (absolute value) at the apex of the front surface is (far) larger than the bending radius at the apex of the rear surface, and the opposite is also true for objective lenses; 10003 i.doc- 10 · 200540824 (2) The numerical aperture NA of the objective lens is almost standard and larger. For example, NA = 0.43 for CD and NA = 0.6 for DVD, although NA is more variable and collimated through Small, which makes the design (radius of curvature, shape / pattern of the surface) and manufacturing (coating / molding) of the collimator lens easier, so the yield and quality will be better. In the optical pickup unit, the collimating lens is always closest to the folding lens, although the collimating lens can be in front of or behind the folding lens, and in some cases, the collimating lens is positioned between the objective lens and the folding lens . Therefore, combining a folding lens and a collimating lens is more suitable than combining a folding lens and an objective lens, so that the optical pickup unit can be made smaller. In addition, the 稜鏡 -type objective is relatively heavy, which adversely affects the sensitivity and power of the driver. According to the idea, the above specific embodiments are illustrative rather than limiting the present invention. Those skilled in the art can design many alternative specific embodiments without departing from the scope of the present invention as defined in the scope of the appended patents. In the scope of a patent application, any reference signs enclosed in parentheses shall not be considered as limiting the scope of the patent application. The words "including" and "including" and similar words do not exclude the occurrence of any exceptions except those listed in any claim or description in general. Elements or steps other than elements or steps. The singular reference of 不 does not exclude the plural reference of such components. Anti-: ,,, and, depending on the hardware including several distinct components, and relying on a suitable computer = can implement the present invention. Among the installations and members of the listed several components, the number of these components is specified by one and the same item of hardware. In the scope of related patent applications that are different from each other, the only thing that is stated in the specific degree is that there is no dispute, and it does not mean that the combination of the measures cannot be used favorably. First & 100031.doc 200540824 [Brief description of the drawings] The specific embodiments of the present invention will be described only by way of example and with reference to the drawings, in which: Figures 1A and 1B are schematic plan views and side views of an optical pickup unit according to the prior art, respectively FIG. 2 is a schematic diagram illustrating main components of an optical driving system according to a first exemplary embodiment of the present invention; and
圖3為解說依據本發明之第二範例性具體實施例的光學 驅動系統之主要組件的示意圖。 【主要元件符號說明】 10 光學元件 14 第一輻射透射平表面 16 第一輪射透射平表面 17 斜邊表面 18 第一雙凸非球面透鏡 20 第二雙凸非球面透鏡 22 雷射二極體 24 分光器 26 光偵測器預放大器1C 30 光學元件 37 内部斜邊表面 40 平表面 110 光摘測器預放大積體電路1C 111 分光器 100031.doc •12- 200540824 112 準直透鏡 113 物鏡 114 光柵 115 雷射二極體 116 折疊鏡 117 偏光器FIG. 3 is a schematic diagram illustrating main components of an optical driving system according to a second exemplary embodiment of the present invention. [Description of main component symbols] 10 Optical element 14 First radiation transmission flat surface 16 First round transmission transmission flat surface 17 Beveled surface 18 First biconvex aspheric lens 20 Second biconvex aspheric lens 22 Laser diode 24 Beamsplitter 26 Photodetector preamplifier 1C 30 Optical element 37 Internal beveled surface 40 Flat surface 110 Optical pickup preamplifier integrated circuit 1C 111 Beamsplitter 100031.doc • 12- 200540824 112 Collimation lens 113 Objective lens 114 Grating 115 Laser Diode 116 Folding Mirror 117 Polarizer
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