九、發明說明： [發明所屬之技術領域】 本發明有關一種光碟機，尤其是關於光碟機中，用以 驅動光學讀取頭，沿著光碟片徑向來回移動讀寫資料之傳 動裝置。 【先前技術】 由於高解析度及大資料量儲存的需求，光碟片的記惟 谷量，由數十MB的CD光碟片，親升至約的dvd光碟 =，甚至進入下一世代奈米級50GB籃光世代，光碟片的^ ^度快速增加，相對地光碟機也隨著輕薄短小的流行趨勢 向小型化，因此要需高精密度，才能在光碟片上精確且 有致的讀寫資料。 ^請參考圖1，為習知光碟機機芯10之背面結構，其上 設有轉動光碟片的主軸馬達ll(Spindle Motor)，沿著主 輪馬達11徑向兩側，設置一對平行的主導桿12及副導桿 一滑車14(Sled)承載一光學讀取頭15 (Optical Head)，滑車14兩端分別可自由滑動地套設於主 ，桿12及跨置於副導桿13，靠近主導桿12的一側，設有 傳動馬達16(Feeding Motor)驅動一齒輪組Π，轉動一 ^桿18 ’螺桿18平行於主導桿12，滑車14結合一彈性的 =接齒19，頂壓於螺桿18的螺紋，當傳動馬達16驅動齒 2組Π轉動螺桿18時，使連接齒19順著螺紋移動，帶動 ^合的滑車14 ’沿著主導桿12及副導桿13來回移動，使 承裁一光學讀取頭15讀寫光碟片上的資料。 然而，傳動馬達一般為電磁轉動形式之直流馬達，不 ♦耗電’易受環境磁場干擾，且扭力較小，需要連接減速 2輪級’作為傳輸及調整輸出扭力，以便快速轉動螺桿移 光學讀取頭，導致增加螺桿與齒輪組的零件成本及裝設 以精確定位，尤且口誤差’使光學讀取頭難 及聚焦等伺服方法加;^密插集度的光碟片，常需藉助循執 需待解決。 ’、機光予讀取頭的傳動裝置，仍有問題 【發明内容】 本發明之目的为 簡化傳動裝置的結構，大傳動裝置’藉由 本發明另-目的為担:㈣件成本。 用高頻率壓電馬達直接值^一種光學讀取頭傳動裝置，利 降低累積公差提高定位g確^加傳動速度、減少嗓音及 用體的學讀取頭傳動裝置，利 雷焉遠，㈣i I 軸力且不受環境磁場影響的壓 A 了、* 5丨光碟機的小型化，提高整體機構的配置彈性。 為工J到前述發明的目的’本發明之光學讀取頭傳動 ^ ,θ ' 一主導桿與一副導桿平行設於機芯，機芯於主 =才干的兩端附近，分別凸伸一固定塊，固定塊穿設一彈性 ，供主導桿穿過，以固定主導桿，將一滑車跨置於該對導 桿’其上承載光學讀取頭，滑車一端設有滑套，且套設於 主導桿，並與主導桿緊密接觸，滑車的另一端與副導桿滑 動接觸，利用一壓電馬達設於主導桿的一端，振動主導桿 驅動滑車，以帶動光學讀取頭。 【實施方式】 有關本發明為達成上述目的，所採用之技術手段及其 功效’茲舉較佳實施例’旅配合圖式加以說明如下。 1335585 請參考圖2,為設有本發明傳動裝置的光碟機機芯20 正面結構，機芯20包含主軸馬達21、主導桿22、副導桿 23、滑車24，光學讀取頭25及壓電馬達26。主要在機芯 20上設轉動光碟片的主軸馬達21，沿著主軸馬達21徑向 兩侧設一對平行的主導桿22及副導桿23，滑車24承載光 學讀取頭25跨置於主導桿22及副導桿23,由壓電馬達26 驅動主導桿22移動動滑車24,使光學讀取頭25來回移動， 讀寫光碟片上的資料。 其中，機芯20的長軸上挖設一長槽孔27，長槽孔27 的一端設主軸馬達21，用以轉動光碟片，沿著主轴馬達21 • 徑向，於長槽孔27的兩侧平行設一對導桿，包含一主導桿 22及一副導桿23,滑車24的兩端分別跨置於主導桿22及 副導桿23，一端設有滑套28穿套於主導桿22，另一端自 由滑動地跨置於副導桿23。壓電馬達26直接設置於主導 桿22的一端，壓電馬達26為積層的壓電材料，例如陶瓷 壓電材料等所製成，當通以相位差的電壓，會產生不同形 狀的變化，造成不同傳動方向的振動，藉由壓電馬達26的 振動，驅動主導桿22移動滑車24，以來回移動滑車24承 載的光學讀取頭25。 φ 如圖3所示，為本發明壓電馬達26傳動滑車24的示 意圖，主導桿22 —端連接於壓電馬達26，用以接收壓電 馬達26所產生的振動。機芯20於主導桿22的兩端附近， 分別凸伸兩固定塊29，兩固定塊29上分別穿設一彈性環 30，彈性環30的材質可為橡膠等，彈性環30供主導桿22 穿過，以固定主導桿22，使主導桿22仍能維持振動的自 由性，以接受壓電馬達26振動控制。 另外，滑車24上承載光學讀取頭25，滑車24的一側 設有滑套28，且將滑套28套設於主導桿22，讓滑套29與 主導桿22保持適當的緊密度，以便滑套28受主導桿22不 7 1335585 同u時產生前後滑移，並於振動一停止即扣住滑套 2與=帶動滑車24及其上的光學讀取頭25前後移動，使 光學讀取頭25獲得定位》 吏 从雷以參ί: 4 ’為使壓電馬達產生往預定方向傳動前進 的電壓。由於積層的壓電馬達通以不同相位的電壓，IX. Description of the Invention: [Technical Field] The present invention relates to an optical disk drive, and more particularly to a drive device for driving an optical pickup in an optical disk drive to move data back and forth along a radial direction of the optical disk. [Prior Art] Due to the high-resolution and large-volume storage requirements, the number of discs in the disc is increased from tens of MB of CD discs to about dvd discs, and even to the next generation of nanometers. With the 50GB basket light generation, the ^^ degree of the optical discs has increased rapidly. Relatively, the optical disc drive has been miniaturized with the trend of lightness, thinness and shortness. Therefore, high precision is required to accurately and accurately read and write data on the optical disc. Please refer to FIG. 1 , which is a rear structure of a conventional optical disc drive 10 , which is provided with a spindle motor 11 (spindle motor) for rotating an optical disc, along which a pair of parallel sides are arranged along the radial sides of the main wheel motor 11 . The main pole 12 and the sub-guide 14 (Sled) carry an optical head 15 (optical head), and the two ends of the trolley 14 are slidably sleeved on the main pole 12, and the rod 12 and the sub-guide 13 are disposed. On the side close to the main rod 12, a driving motor 16 is provided to drive a gear set Π, and a rod 18 is rotated. The screw 18 is parallel to the main rod 12, and the pulley 14 is combined with a resilient = tooth 19 for pressing. When the transmission motor 16 drives the gear set 2 to rotate the screw 18, the connecting teeth 19 are moved along the thread, and the sliding pulley 14' is moved back and forth along the main rod 12 and the auxiliary guide rod 13 so that the thread of the screw 18 is driven. An optical pickup 15 is ordered to read and write data on the optical disc. However, the drive motor is generally a DC motor in the form of electromagnetic rotation. It does not consume electricity. It is easily interfered by the environmental magnetic field, and the torque is small. It needs to be connected to the deceleration 2 wheel stage as the transmission and adjust the output torque to quickly turn the screw shift optical reading. Taking the head leads to an increase in the cost of the parts of the screw and the gear set and the installation for precise positioning, especially the port error 'to make the optical reading head difficult to focus and other servo methods; ^ densely inserted optical disc, often need to follow The need to be resolved. There is still a problem with the transmission of the machine head to the pickup head. SUMMARY OF THE INVENTION The object of the present invention is to simplify the structure of the transmission device, and the present invention is directed to the cost of (four) pieces. Directly use a high-frequency piezoelectric motor to control the optical pickup drive, reduce the cumulative tolerance, improve the positioning, improve the transmission speed, reduce the noise and the body of the read head transmission, Li Leiyuan, (4) i I The pressure A, which is not affected by the environmental magnetic field, and the miniaturization of the optical drive, improve the flexibility of the overall mechanism. For the purpose of the foregoing invention, the optical pickup drive of the present invention ^, θ ' a main rod and a pair of guide rods are disposed in parallel with the movement, and the movement is respectively protruded and fixed near the ends of the main = the stem. Block, the fixing block is provided with a elasticity for the main rod to pass through to fix the main rod, and a pulley is placed on the pair of guiding rods, and the optical reading head is carried thereon, and the sliding sleeve is provided with a sliding sleeve at one end, and is sleeved on the block The main rod is in close contact with the main rod, and the other end of the pulley is in sliding contact with the sub-guide rod, and is disposed at one end of the main rod by a piezoelectric motor, and the vibrating main rod drives the pulley to drive the optical pickup. [Embodiment] The present invention has been made in view of the above objects, the technical means employed, and the effect thereof, as described in the following. 1335585 Please refer to FIG. 2, which is a front structure of an optical disc drive 20 provided with a transmission device of the present invention. The movement 20 includes a spindle motor 21, a main rod 22, a sub-guide 23, a trolley 24, an optical pickup 25 and a piezoelectric device. Motor 26. Mainly on the movement 20, a spindle motor 21 for rotating the optical disc is arranged, and a pair of parallel main rods 22 and sub-guide rods 23 are arranged along the radial sides of the main shaft motor 21, and the trolley 24 carries the optical pickup 25 to straddle the main The rod 22 and the sub-guide 23 are driven by the piezoelectric motor 26 to drive the movable rod 24 to move the optical pickup 24 back and forth to read and write the data on the optical disc. Wherein, a long slot 27 is dug on the long axis of the movement 20, and one end of the long slot 27 is provided with a spindle motor 21 for rotating the optical disc, along the spindle motor 21; radial, in the long slot 27 A pair of guide rods are arranged in parallel, and a main rod 22 and a pair of guide rods 23 are arranged. The two ends of the trolley 24 are respectively disposed on the main rod 22 and the sub-guide rod 23, and one end is provided with a sliding sleeve 28 and is sleeved on the main rod 22 The other end is slidably slid across the secondary guide 23. The piezoelectric motor 26 is directly disposed at one end of the main rod 22, and the piezoelectric motor 26 is made of a laminated piezoelectric material, such as a ceramic piezoelectric material. When a voltage of a phase difference is applied, different shapes are changed, resulting in a change. The vibration of the different transmission directions, by the vibration of the piezoelectric motor 26, drives the main rod 22 to move the trolley 24 to move the optical pickup 25 carried by the trolley 24 back and forth. φ As shown in Fig. 3, the piezoelectric motor 26 of the present invention is shown in the drive block 24. The main shaft 22 is connected to the piezoelectric motor 26 for receiving the vibration generated by the piezoelectric motor 26. The movement 20 is adjacent to the two ends of the main rod 22, and the two fixing blocks 29 are respectively protruded. The two fixing blocks 29 are respectively provided with an elastic ring 30. The elastic ring 30 can be made of rubber or the like, and the elastic ring 30 can be used for the main rod 22. Passing through to fix the main rod 22 allows the main rod 22 to maintain the freedom of vibration to receive vibration control of the piezoelectric motor 26. In addition, the slider 24 carries the optical pickup 25, one side of the trolley 24 is provided with a sliding sleeve 28, and the sliding sleeve 28 is sleeved on the main rod 22, so that the sliding sleeve 29 and the main rod 22 are properly tightly closed, so that When the sliding sleeve 28 is not 7 1335585 with the main rod 22, the front and rear slips are generated, and when the vibration is stopped, the sliding sleeve 2 and the driving pulley 24 and the optical reading head 25 thereon are moved forward and backward to make optical reading. The head 25 obtains the position 》 雷 雷 : :: 4 ' is the voltage for the piezoelectric motor to drive forward in a predetermined direction. Since the laminated piezoelectric motor is connected to voltages of different phases,
生不同方向的傳動’當對壓電馬達不同的特㈣電材料層 Α及Β，分別通以不同相位的脈衝電壓Α及電壓Β，即^ 材料層的電壓A脈衝相位，較壓電材料層β的電壓8脈 相位前，則形成壓電馬達振動主導桿，傳動滑車往預定 向前進。反之，如圖5為使壓電馬達產生往相反預定 傳動前進的電壓。當_電馬達不同的較壓電 及B,分別通以不同相位的脈衝電壓a及電壓B，即壓 料層的電壓A脈衝相位，較壓電材料層B的電壓8脈 位晚，則形成壓電馬達振動主導桿，傳動滑車往與預定方 向相反的方向前進。此種壓電材料的通電壓後所產生的變 化特性為習知，在此僅作本發明運作過程的說明，並非本 發明的技術特徵，不予贅述。因此只要適當控制電壓的脈 衝頻率及相位，即可有效的控制壓電馬達前移或後移滑車 的次數，藉此精確控制推動滑車前進或後退的距離，使光 學讀取頭獲得精確的定位。 因此，本發明光學讀取頭傳動褒置，即可利用壓電馬 達提供較大的扭力’直接振動主導桿以帶動光學讀取頭移 動，而可減少螺桿與齒輪組的使用，不僅可降低零件成本， 並能減少螺桿與齒輪組所佔的空間，加上壓電馬達體積 小、重量輕且不受環境磁場影響，更能簡化傳動裝置結構， 以利光碟機的小型化，且能提高光碟機内部零件配置的彈 性。 此外，本發明壓電馬達的頻率可達數萬赫茲的超音 波，可快速的推動光學讀取頭’在主導桿及副導桿移動至 8 1335585 定位，而且此種超高的頻率已超過人耳所能聽到大約在20 赫茲至20千赫茲間聲音頻率，因此本發明壓電馬達可安靜 進行傳動而無噪音。另外，傳統磁電式馬達，其轉子具有 轉動慣性，無法立即停止定位，而本發明壓電馬達係以主 導桿步進方式向前或向後推動滑套，壓電馬達並無慣性存 在，滑套於主導桿振動一停止即扣住主導桿，而可提高定 位精度，尤其對於屬於無回授訊號開路（OPEN-LOOP)設計的 光雕系統（Light Scribe System)，更能以精確的定位，以 光學讀取頭刻出精準的光碟片標籤。 以上所述者，僅為用以方便說明本發明之較佳實施 • 例，本發明之範圍不限於該等較佳實施例，凡依本發明所 做的任何變更，於不脫離本發明之精神下，皆屬本發明申 請專利之範圍。The transmissions in different directions 'When the different (four) electrical material layers and Β are different for the piezoelectric motor, the pulse voltage Α and voltage 不同 of different phases are respectively passed, that is, the voltage A pulse phase of the material layer is compared with the piezoelectric material layer. Before the voltage of β is 8 pulses, the piezoelectric motor vibration dominant rod is formed, and the transmission pulley advances toward the predetermined direction. Conversely, as shown in Fig. 5, the piezoelectric motor is caused to generate a voltage that advances to the opposite predetermined drive. When the _ electric motor is different from the piezoelectric and B, respectively, the pulse voltage a and the voltage B of different phases are respectively passed, that is, the voltage A pulse phase of the ram layer is later than the voltage 8 pulse of the piezoelectric material layer B, forming The piezoelectric motor vibrates the main rod, and the transmission pulley advances in a direction opposite to the predetermined direction. The change characteristics of the piezoelectric material after the voltage is applied are well known, and are merely illustrative of the operation of the present invention, and are not technical features of the present invention and will not be described again. Therefore, as long as the pulse frequency and phase of the voltage are properly controlled, the number of times the piezoelectric motor advances or moves backwards can be effectively controlled, thereby precisely controlling the distance at which the carriage is advanced or retracted, so that the optical pickup can be accurately positioned. Therefore, the optical pickup driving device of the present invention can provide a large torque by using a piezoelectric motor to directly vibrate the main rod to drive the optical pickup to move, thereby reducing the use of the screw and the gear set, and not only reducing the parts. Cost, and can reduce the space occupied by the screw and the gear set. In addition, the piezoelectric motor is small in size, light in weight and unaffected by the environmental magnetic field, which simplifies the structure of the transmission device, facilitates the miniaturization of the optical disk drive, and can improve the optical disk. The flexibility of the internal part configuration of the machine. In addition, the piezoelectric motor of the present invention can reach an ultrasonic wave with a frequency of several tens of megahertz, which can quickly push the optical pickup head to move in the position of the main rod and the sub-guide rod to 8 1335585, and the ultra-high frequency has exceeded the number of people. The ear can hear a sound frequency of between about 20 Hz and 20 kHz, so the piezoelectric motor of the present invention can be quietly driven without noise. In addition, in the conventional magnetoelectric motor, the rotor has rotational inertia, and the positioning cannot be stopped immediately. However, the piezoelectric motor of the present invention pushes the sliding sleeve forward or backward in a stepping manner of the rod, and the piezoelectric motor has no inertia, and the sliding sleeve is When the vibration of the main rod is stopped, the main rod is buckled, and the positioning accuracy can be improved, especially for the Light Scribe System which belongs to the OPEN-LOOP design, which can accurately position and optically The reading head engraves a precise disc label. The above is only a preferred embodiment for facilitating the description of the present invention, and the scope of the present invention is not limited to the preferred embodiments, and any changes made in accordance with the present invention may be made without departing from the spirit of the present invention. All of them are within the scope of the patent application of the present invention.
9 1335585 【圖式簡單說明】 圖1為習知光碟機機芯之後視圖。 圖2為本發明光碟機機芯之正視圖。 圖3為本發明傳動裝置之側示意圖。 圖4為本發明預定方向的電壓之示意圖。 圖5為本發明相反預定方向的電壓之示意圖 【主要元件符號說明】 20 機芯 21 主軸馬達 22 主導桿 23 副導桿 24 滑車 25 光學讀取頭 26 壓電馬達 27 長槽孔 28 滑套 29 固定塊 30 彈性環9 1335585 [Simple description of the drawings] Fig. 1 is a rear view of a conventional optical disc machine movement. Figure 2 is a front elevational view of the optical disc drive of the present invention. Figure 3 is a side elevational view of the transmission of the present invention. Figure 4 is a schematic illustration of the voltage in a predetermined direction of the present invention. Figure 5 is a schematic view of the voltage in the opposite predetermined direction of the present invention. [Main component symbol description] 20 movement 21 spindle motor 22 main rod 23 sub-guide rod 24 pulley 25 optical pickup 26 piezoelectric motor 27 long slot 28 sleeve 29 Fixed block 30 elastic ring