經濟部中央標準局員工消費合作社印製 311221五、發明说明（1 ) 〔發明之背景〕 本發明係鼷於一種用於光碟記錄再生裝置之拾光器者。 近幾年，隨著光碟裝置之小型、低成本化，再促進光 碟光學零件之積體化，從而使用半導體激光器、受光元件 及光學元件成一體之全息照相激光器件。 Μ下，一面參照附圖，一面就習知拾光器之一例說明 之0 第4圖係顯示習知拾光器之光學構成者。於此圖中， 21係備有繞射光柵部22之全息照相撖光器件，此繞射光柵 部22構成有一用來產生跟跡檢出用之副射束之繞射光柵； 23為反射鏡；24爲物鏡；25為磁碟；26為磁碟上之磁道； 27為主射束；27a，27b為跟踪檢出用之副射束。全息照相 激光器21之封裝形狀係爲了拾光器之薄型化而形成，在一 部分具有可旋轉調整之圓弧形狀28a，28b的一方作為長邊 ，而另一方作爲短邊之矩形形狀。 從全息照相激光器件21向光碟面平行放射之光束B ( 設其光軸爲A)，係藉由跟磁碟面成45’角度之反射鏡向 垂直於磁碟之方向反射，並由物鏡24聚光於磁碟上。 第5圖為第4圈之平面圔。於第5圖中，從全息照相 激光器件21朝向反射鏡23之光束光軸A之方向，係與在主 射束投射點之磁道之切線方向29—致。又，連結副射束27a ，27b之直線27c與磁道切線29所成之角度β，通常為了跟 踪檢出靈敏度能逹到最大，而將全息照相激光器件21繞光 軸Α旋轉調整，俥使β = arcsin(P/2L)之角度，但L為副 射束間距，P為磁道間距。 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) • 士.5-Printed by the Staff Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 311221 V. Description of the invention (1) [Background of the invention] The present invention is applicable to an optical pickup used in an optical disc recording and reproducing device. In recent years, with the miniaturization and low cost of optical disc devices, the integration of optical disc components has been promoted, so that holographic laser devices in which semiconductor lasers, light receiving elements and optical elements are integrated have been used. Below M, an example of a conventional optical pickup will be described while referring to the drawings. Figure 4 shows the optical components of the conventional optical pickup. In this figure, 21 is a holographic optical device with a diffractive grating section 22, and the diffractive grating section 22 constitutes a diffractive grating for generating a secondary beam for tracking detection; 23 is a mirror ; 24 is the objective lens; 25 is the magnetic disk; 26 is the track on the magnetic disk; 27 is the main beam; 27a, 27b are the secondary beams for tracking detection. The package shape of the hologram laser 21 is formed to make the optical pickup thinner, and one part has a circular shape 28a and 28b which can be rotatably adjusted, and one side is a long side, and the other side is a short side rectangular shape. The light beam B radiated parallel to the disc surface from the holographic laser device 21 (set its optical axis as A) is reflected by the mirror at an angle of 45 'to the disc surface and is reflected by the objective lens 24 in a direction perpendicular to the disc Focus on the disk. Picture 5 is the plane circle of the fourth circle. In Fig. 5, the direction of the optical axis A of the light beam from the hologram laser device 21 toward the reflecting mirror 23 coincides with the tangent direction 29 of the magnetic track at the point where the main beam is projected. In addition, the angle β formed by the straight line 27c connecting the secondary beams 27a and 27b and the track tangent 29 is usually adjusted to rotate the hologram laser device 21 around the optical axis A in order to maximize the detection sensitivity, so that β = The angle of arcsin (P / 2L), but L is the secondary beam spacing and P is the track spacing. The size of this paper is applicable to the Chinese National Standard (CNS) Α4 specification (210Χ297mm) (please read the precautions on the back before filling this page) • taxi. 5-
-1T 線！ 4 Α7 Β7 311221 五、發明説明（2 ) 然而，一如第6圖所示，如使用了一捶全息照相繞射 光柵部22之繞射方向30為平行於全息照相激光器件封裝31 之短邊方向的全息照相激光器件時，爲使副射束方向27c 與磁道切線方向僅傾斜前述0，而如第7圖所示必需將全 息照相激光器件21向平行於磁碟25之面旋轉α，為此存在 箸拾光器33之厚度增至全息照相激光器件21之對於光學基 台32之突出份Η等問題。 又，為了緩和此問題，雖使用有如第8圖所示的、預 先使繞射光柵部22對全息照柑激光器件21之封装傾斜一規 定角度之手段，但前述L之數值即0之數值卻依使用者俩 之物鏡之倍率規格而異，因此，要駸密地使全息照相激光 器件21之突出消失，是不可能之事。 本發明係有鑑於前逑習知之缺點而提供薄型之拾光器 為目的者。 〔發明之概要〕 為解決前述課題而創作之本發明之拾光器包含有：一 全患照相撖光器件，其用來產生跟踪檢出用副射束之撓射 光柵之繞射方向係與封裝之短邊方向一致；一基台，係用 來安装此全息照相瀲光器件使其可繞其光軸旋轉；一反射 鏡，係固定在前述基台，Μ便把放射自全息照相激光器件 之光束向垂直於磁碟面之方向反射；及一物鏡，係配置在 此反射鏡與磁碟面之間；其特擻在於：將前述全息照相激 光器件及前述反射鏡安裝在前述基台，以便從前述全息照 相瀲光器件朝向前述反射鏑之光束的、光軸之對於磁碟面 之投影，與磁碟上之在主光束投射酤之磁道切線方向所成 本紙張尺度適用中國國家標準（CNS ) Α4規格（2丨0 X 297公釐） (請先閲讀背面之注意事項再填寫本頁) 言 經濟部中央標準局貝工消費合作社印製 311221 A7 B7 五、發明説明（3 ) 之角度，具有一規定值。 又，本發明之拾光器之特徴在於：將前述全息照相激 光器件及前述反射鏡安裝在前述光學基台，使得從前述全 息照柑激光器件朝向前述反射鏡之光束的、光軸之對於磁 碟面之投影，與磁碟上之在主光束投射點之磁道切線方向 所成之角度β成為： Θ = arcs 1n(P/2L) 但，L為副射束間距，Ρ為磁道間距。 本發明在前述構成下，將全息照相激光器配置成其光 軸平行於磁碟面，藉其微小量之調整，使對於磁碟之磁道 的兩副射束間之直線，傾斜一規定角度，從而可實現拾光 器之薄型化。 〔圖式之簡單說明〕 第1画係本發明拾光器之光學条的斜視團； 第2圖係該光學条之平面圖； 第3圖係該拾光器之俩面匾； 第4圖係習知拾光器之光學糸的斜視圖； 第5圖係該光學条之平面圖； 經濟部中央標準局員工消費合作社印裝 第6圖係從Μ往即已使用的全息照相檄光器件之正面 圔； 第7圖係習知拾光器之俩面圈·，及 第8圈係其他習知全息照相激光器件之正面圖。 〔較宜實施例之說明〕 Μ下，一面參照第1圈〜第3圈一面就本發明拾光器 之實施例，詳細說明之。 本紙張尺度適用中國國家標準（CNS ) Α4規格（210Χ 297公釐） -6 - 經濟部中央標準局貝工消費合作社印製 A7 B7 i'發明説明（4) 於圈中，1係備有撓射光柵部2之全息照相激光器件 ，此撓射光柵部2構成有一用來產生跟踪檢出用之副射束 的撓射光柵，此全息照相激光器件之内部具有發光元件及 受光元件。3係使來自前述全息照相激光器件1之光束B (其光軸10)向垂直方向反射之反射鏡；4係使其光束B 聚光之物鏡；5係供所聚光之光束照射之磁碟；6爲其磁 碟上之磁道。7係前述光束B之聚光在磁碟5上之主射束 ;7a，7b為跟踪檢出用之副射束；7c為連結副射束7a，7b 之直線；11係顯示前述磁道6之切線方向。全息照柑激光 器件1之封裝形狀，係為了拾光器之薄型化而形成一邊爲 長邊一邊為短邊8之矩形形狀；前述全息照相激光器件之 繞射方向，係與封裝之短邊8之方向（垂直方向）平行。 又，全息照片激光器件1，係於短邊8之方向具有可將該 全息照相激光器件1旋轉調整的圔弧形狀9a，9b，Μ作為 安裝在一構成拾光器13之基台12時之調整導件。 在此處，乃將全息照相激光器件1安裝成，其光軸10 方向平行於磁碟5面。而且，如第2匾所示，將前述全息 照相瀲光器件1與反射鏡3安装在拾光器基台12上，使得 於平行於磁碟5之面内，從全息照相瀲光器件1朝向反射 鏡3之光軸10之對於磁碟面之投影10a，與磁道6之切線 方向所成之角度0成為： Θ = arcsi n (P/2L) 但，L為副射束7a，7b之間距；Ρ為磁道間距。又，第1圖 中之0，係顯示一平行於磁道6之切線方向11之線11a與 光軸10所成之角度，與前逑第2鼷之0顯示同一角度。 本紙張尺度適用中國國家標準（CNS ) A4規格（210Χ297公釐） ---------1,------tr——:-----線 (請先閱讀背面之注意事項异填寫本頁) 7 A7 B7 五、發明説明（5) 就如上述所構成之拾光器，說明其作用如下。 於第1圖、第2圖中，從全息照柑檄光器放射之與磁 碟5面平行之光，經由繞射光柵2撓射後，再由對磁碟5 面形成45°角度的反射鏡3朝向垂直於磁碟5之方向反射 ，然後藉物鏑4聚光於磁碟5上。此時，磁碟5上之繞射 方向，即連結副射束7a，7b之直線7c，與從全息照相撖光 器件1朝向反射鏡3之光束的光軸10之對於磁碟5面之投 影10—致。卽，連結副射束7a，7b之直線7c變成與磁道6 切線方向11成角度0，藉此可使跟踪檢出靈敏度達到最大 Ο 如依上述之本實施例，雖因各零件所具之誤差，而實 際上需要將全息照相激光器件1之封裝，於画弧形狀9a， 9b，旋轉調整微小量，但較之習知者，更可保持全息照相 瀲光器件1成平行於磁碟5面，可如第3圖所示使來自基 台12之突出消失。 -----------支------訂--^-----唆I (請先閱讀背面之注意事項再填寫本頁) 經濟部中夬標準局員工消費合作社印製 本紙張尺度適用中國國家標準（CNS ) A4規格（210X 297公釐） 8 A7 B7 五、發明説明（6 ) 元件檷號對照表 1 ——全息照相激光器件 2 ....撓射光柵 3 ....反射鏡 4 ....物鏡 5 ....磁碟 6 ——磁道 7 ——主射束 7a, 7b——副射束 7c ·...直線 8 ....封裝短邊方向 9a,9b ....圓弧形狀 10— —光軸 11— —切線方向 12 ____基台 13 ....拾光器 B ——光束 ------^----&------ΪΤ——^-----Φ (請先閱讀背面之注意事項再填寫本頁) 經濟部中央標準局員工消費合作社印製 本紙張尺度適用中國國家標準（CNS ) A4規格（210 X 297公釐） 9-1T line! 4 Α7 Β7 311221 V. Description of the invention (2) However, as shown in FIG. 6, if a hologram diffraction grating portion 22 is used, the diffraction direction 30 is parallel to the short side of the hologram laser device package 31 Direction of the holographic laser device, in order to tilt the secondary beam direction 27c and the track tangent direction by only the aforementioned 0, as shown in FIG. 7, it is necessary to rotate the holographic laser device 21 parallel to the surface of the magnetic disk 25 by α, This has the problem that the thickness of the optical pickup 33 increases to the protrusion Η of the hologram laser device 21 to the optical base 32 and the like. In addition, in order to alleviate this problem, although a method of tilting the diffraction grating portion 22 in advance to the package of the hologram laser device 21 by a predetermined angle as shown in FIG. 8 is used, the value of the aforementioned L is the value of 0. The magnification specifications of the objective lenses of the two users differ, so it is impossible to make the projection of the hologram laser device 21 disappear densely. The present invention is intended to provide a thin optical pickup in view of the shortcomings of the prior art. [Summary of the Invention] The optical pickup of the present invention created to solve the aforementioned problems includes: a full-fledged photo-optical device, which is used to generate the diffraction direction of the deflection grating of the secondary beam for tracking and detection and The short sides of the package are in the same direction; a base is used to install the holographic optical device so that it can rotate around its optical axis; a reflector is fixed to the aforementioned base, and the M will emit the self-holographic laser device The light beam is reflected in a direction perpendicular to the surface of the disk; and an objective lens is arranged between the mirror and the surface of the disk; its special feature is that the holographic laser device and the mirror are installed on the base, So that the projection of the optical axis toward the disk surface from the holographic optical device towards the dysprosium beam, and the direction of the track tangent to the main beam projection on the disk, the paper size is subject to the Chinese National Standard (CNS ) Α4 specifications (2 丨 0 X 297 mm) (please read the notes on the back before filling in this page) 311221 A7 B7 printed by Beigong Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economy V. Description of the invention (3) The angle has a specified value. Furthermore, the optical pickup of the present invention is characterized in that the holographic laser device and the mirror are mounted on the optical base so that the optical axis of the beam from the holographic laser device toward the mirror is opposite to the magnetic axis The angle β formed by the projection of the disc surface and the tangent direction of the track on the magnetic disc at the projection point of the main beam becomes: Θ = arcs 1n (P / 2L) However, L is the secondary beam spacing and P is the track spacing. In the present invention, under the foregoing configuration, the holographic laser is arranged so that its optical axis is parallel to the surface of the magnetic disk, and by a slight adjustment, the straight line between the two beams of the magnetic track of the magnetic disk is inclined by a predetermined angle, thereby Thinner optical pickups can be realized. [Simple description of drawings] Picture 1 is the strabismus of the optical strip of the optical pickup of the present invention; Picture 2 is a plan view of the optical strip; Picture 3 is the two plaques of the pickup; Picture 4 The oblique view of the optical fiber of the conventional optical pickup; Figure 5 is a plan view of the optical strip; Printed by the Employee Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs.圔; Figure 7 is a front view of two conventional face picks for optical pickups, and Figure 8 is a front view of other conventional holographic laser devices. [Explanation of a preferred embodiment] Next, the embodiment of the optical pickup of the present invention will be described in detail while referring to the first to third circles. This paper scale is applicable to the Chinese National Standard (CNS) Α4 specification (210Χ 297 mm) -6-A7 B7 i 'invention description printed by the Beigong Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs (4) In the circle, 1 series is available In the holographic laser device of the grating part 2, the deflecting grating part 2 constitutes a deflecting grating for generating a secondary beam for tracking detection. The holographic laser device has a light emitting element and a light receiving element inside. 3 is a mirror that reflects the light beam B (the optical axis 10) from the aforementioned holographic laser device 1 in the vertical direction; 4 is an objective lens that condenses the light beam B; 5 is a magnetic disk for irradiating the condensed light beam ; 6 is the track on the disk. 7 is the main beam of the aforementioned light beam B condensing on the magnetic disk 5; 7a, 7b are the secondary beams for tracking detection; 7c is the straight line connecting the secondary beams 7a, 7b; 11 is the display of the aforementioned track 6 Tangent direction. The package shape of the holographic photo laser device 1 is a rectangular shape with one long side and short side 8 for the thinning of the optical pickup; the diffraction direction of the aforementioned holographic laser device is the short side 8 of the package The direction (vertical direction) is parallel. In addition, the hologram laser device 1 is provided with sag arc shapes 9a, 9b in the direction of the short side 8 which can rotate the hologram laser device 1 to be adjusted, when it is mounted on a base 12 constituting the optical pickup 13 Adjustment guide. Here, the hologram laser device 1 is mounted so that the direction of the optical axis 10 is parallel to the surface of the magnetic disk 5. Furthermore, as shown in the second plaque, the aforementioned holographic optical device 1 and the mirror 3 are mounted on the optical pickup base 12 so that they are parallel to the surface of the magnetic disk 5 from the holographic optical device 1 toward The angle 0 of the projection 10a of the optical axis 10 of the mirror 3 to the disk surface and the tangent direction of the track 6 becomes: Θ = arcsi n (P / 2L) However, L is the distance between the secondary beams 7a and 7b ; Ρ is the track pitch. In addition, 0 in FIG. 1 shows an angle formed by a line 11a parallel to the tangential direction 11 of the track 6 and the optical axis 10, and it shows the same angle as 0 of the second second front. This paper scale is applicable to the Chinese National Standard (CNS) A4 specification (210Χ297 mm) --------- 1, ------ tr ----: ----- line (please read the back side first Matters needing attention vary on this page) 7 A7 B7 V. Description of the invention (5) The optical pickup constructed as above, its function is as follows. In Fig. 1 and Fig. 2, the light radiated from the holographic illuminator parallel to the surface of the disk 5 is deflected by the diffraction grating 2 and then reflected at a 45 ° angle to the surface of the disk 5 The mirror 3 is reflected in a direction perpendicular to the magnetic disk 5, and then focused on the magnetic disk 5 by the object dysprosium 4. At this time, the diffraction direction on the magnetic disk 5, that is, the straight line 7c connecting the secondary beams 7a, 7b, and the projection of the optical axis 10 of the light beam from the holographic optical device 1 toward the mirror 3 on the surface of the magnetic disk 5 10—To. That is, the straight line 7c connecting the secondary beams 7a, 7b becomes an angle 0 with the tangential direction 11 of the track 6, thereby maximizing the tracking detection sensitivity. As in this embodiment described above, although due to the error of each part In fact, it is necessary to encapsulate the holographic laser device 1 in the drawing arc shape 9a, 9b, and adjust the rotation by a small amount, but it can keep the holographic optical device 1 parallel to the magnetic disk 5 than the conventional ones. As shown in FIG. 3, the protrusion from the base 12 may disappear. ----------- Support ------ Subscribe-^ ----- 唆 I (Please read the notes on the back before filling in this page) Employee consumption of the Bureau of Standards and Statistics, Ministry of Economic Affairs The size of the paper printed by the cooperative is applicable to the Chinese National Standard (CNS) A4 specification (210X 297mm) 8 A7 B7 5. Description of the invention (6) Comparison table of element number 1-holographic laser device 2 .... Grating 3 .... Mirror 4 .... Objective 5 .... Disk 6-Track 7-Main beam 7a, 7b-Sub-beam 7c · ... Straight line 8 .... Package short side direction 9a, 9b .... arc shape 10-optical axis 11-tangent direction 12 ____ base 13 .... Pickup B-beam ------ ^- -& ------ ΪΤ —— ^ ----- Φ (please read the precautions on the back before filling in this page) The paper standard printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs is applicable to Chinese national standards (CNS) A4 specification (210 X 297 mm) 9