TWI278855B - Driving apparatus for objective lens - Google Patents

Abstract

This invention provides a driving apparatus for objective lens for light pick-up. The driving apparatus for objective lens enables the actuator moving portion, which is formed by a lens holder used to holder an objective lens, to be displaceably supported on the frame. An abutting portion is provided on the pick-up moving portion. An actuator frame integral with the frame is arranged about the two outsides of the pick-up moving portion. Stopper is provided respectively on the left and right upper portion of said actuator frame. Thus, the action beyond specified action toward the disc direction of the moving portion can be limited by the abutment of the stopper with the abutting portion.

Description

玖、發明說明： (一） 發明所屬之技術領域 本發明係關於一種光學拾訊器（pick-up)物鏡驅動裝置。 (二） 先前技術 以往，對碟片等之訊號記錄媒體以光學方式執行訊號讀取 、或訊號寫入之光學頭係具有殻體，而其內部中組裝有屬發 光元件之半導體雷射及屬受光元件之檢光器。在殼體中配置 有鋼板製之框架，而與其成一體化之致動器框架係沿著含有 透鏡之可動部之兩側面的附近而配置，框架的下部中安裝有 殼體。BRIEF DESCRIPTION OF THE DRAWINGS (I) Field of the Invention The present invention relates to an optical pick-up objective lens driving device. (2) In the prior art, an optical head system that optically performs signal reading or signal writing on a signal recording medium such as a disc has a casing, and a semiconductor laser and a genus belonging to the illuminating element are assembled therein. The photodetector of the light receiving element. A frame made of a steel plate is disposed in the casing, and an actuator frame integrated therewith is disposed in the vicinity of both side faces of the movable portion including the lens, and a casing is mounted in a lower portion of the frame.

並且，在可動部之透鏡架（lens holder)上，分別在其左右 之側面中，於做爲碟片側之上部及做爲其相反側之下部分別 設置有支持部。透鏡架分別被懸吊線支撑於該4個地點的支 持部上。各懸吊線之另一端設置有保持該懸吊線的保持部， 保持部係被螺絲固定在框架上。而被懸吊線支撑之透鏡架係 與線圈捲軸共同成型，且在線圈捲軸之上面設有突起狀之抵 接部。 並且’致動器框架上配置有將可動部全體覆蓋住之鋼板製 的蓋。且’配置於可動部之左右兩側面上之致動器框架的上 部係利用折曲的板狀彈簧而將蓋之兩上端部覆蓋。因而，在 動作時’因爲蓋之折曲內面與抵接部互相抵接時，而使可動 部朝向碟片方向之所規定以外的動作受到限制。因此，蓋之 內面與抵接部被構成止動件機構。 【專利文獻1】 曰本特開平2000-251298號公報 一 5- φ\ 127_續彻 ·. 年月日 . 【本發明所欲解決之課題】 * 在先前技術的物鏡驅動裝置係構成爲，如前面所述’配置 ‘ 在懸吊線之兩側面附近之致動器框架上貼附有將可動部全 體覆蓋用之鋼板製之蓋，蓋之止動件部分與設置於線圈捲軸 之上面的抵接部互相抵接。但是，在超薄型光學拾訊器之中 ，一方面必須確保碟片及光學拾訊器蓋之間的間隙、及透鏡 可動量，一方面必須謀求小型化，因此會使磁氣回路上部之 取決於光學拾訊器蓋配置的止動件構成變成困難。 亦即，將覆蓋光學拾訊器整體的蓋做爲止動件所構成的先 φ 前技術之物鏡可動範圍限制中，由於蓋的安裝位置偏差對姿 勢受控之透鏡的影響，而使透鏡之可動範圍產生偏差。當可 動範圍產生偏差時，使透鏡架上下的量超出所需、而造成懸 吊線的應力增加。在極端的情況，在外力（衝擊）施加時，對 止動件的接觸狀態會變成不平衡，因而有懸吊線變形之虞。 本發明係欲提供一種可解決上述問題之物鏡驅動裝置。. (三）發明說明Further, in the lens holder of the movable portion, a support portion is provided on each of the left and right side surfaces as the upper portion on the disc side and the lower portion on the opposite side. The lens holders are respectively supported by the suspension lines on the support portions of the four locations. The other end of each suspension wire is provided with a holding portion for holding the suspension wire, and the holding portion is screwed to the frame. The lens frame supported by the suspension wire is formed integrally with the coil reel, and a protruding abutting portion is provided on the coil reel. Further, a cover made of a steel plate covering the entire movable portion is disposed on the actuator frame. Further, the upper portion of the actuator frame disposed on the left and right side surfaces of the movable portion covers the upper end portions of the cover by a bent plate spring. Therefore, when the inner surface of the bent inner surface of the cover abuts against the abutting portion during the operation, the operation other than the predetermined direction of the movable portion toward the disc direction is restricted. Therefore, the inner surface of the cover and the abutting portion are configured as a stopper mechanism. [Patent Document 1] Japanese Patent Application Laid-Open No. Hei. No. 2000-251298 A 5- φ \ 127 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ As described above, 'arrangement' attaches a cover made of a steel plate for covering the entire movable portion to the actuator frame near both sides of the suspension wire, and the stopper portion of the cover and the upper surface of the coil reel The joints abut each other. However, in the ultra-thin optical pickup, on the one hand, it is necessary to ensure the gap between the disc and the optical pickup cover, and the lens movable amount, and on the other hand, it is necessary to achieve miniaturization, and thus the upper portion of the magnetic circuit can be made. The formation of the stopper depending on the configuration of the optical pickup cover becomes difficult. That is, in the movable range limitation of the objective lens of the prior art, which covers the entire cover of the optical pickup as the stop member, the lens is movable due to the influence of the mounting position deviation of the cover on the lens of the posture control. The range is biased. When there is a deviation in the movable range, the amount above and below the lens holder is made larger than necessary, and the stress of the suspension line is increased. In an extreme case, when an external force (impact) is applied, the contact state of the stopper becomes unbalanced, and thus the suspension line is deformed. The present invention is intended to provide an objective lens driving device that can solve the above problems. (3) Description of the invention

【解決課題之手段】 光學拾訊器可動部上設有抵接部，在光學拾訊器可動部之 兩側面附近配置有與框架一體化之致動器框架，在該致動器 框架的上部各設置有止動件，止動件與該抵接部互相抵接時 ’使可動部朝向碟片方向之所規定以外的動作受到限制。 (四）實施方式 【實施例】 第1圖係顯示本發明物鏡驅動裝置之一個實施例的立體圖 第2圖係顯示第1圖所示之物鏡驅動裝置的要部之一部分 -6 -[Means for Solving the Problem] The movable portion of the optical pickup is provided with an abutting portion, and an actuator frame integrated with the frame is disposed near both sides of the movable portion of the optical pickup, at the upper portion of the actuator frame Each of the stoppers is provided, and when the stopper and the abutting portion abut each other, the operation other than the regulation of the movable portion toward the disc direction is restricted. (4) Embodiments Fig. 1 is a perspective view showing an embodiment of an objective lens driving device of the present invention. Fig. 2 is a view showing a part of an essential part of the objective lens driving device shown in Fig. 1 -

除去之狀態的立體圖，第3圖係從第1圖所示之物鏡驅動裝 置的不同方向看去之立體圖。 物鏡1被保持在透鏡架2上，同時其端部上一體成型有捲 線軸2 a。在捲線軸2 a上有焦點線圈3捲繞地裝設於內周上 ，並且追蹤線圈4，5在捲線軸2 a內與焦點線圈3相接而捲 繞在預定位置上。A perspective view of the removed state, and Fig. 3 is a perspective view of the objective lens driving device shown in Fig. 1 in a different direction. The objective lens 1 is held on the lens holder 2 while a bobbin 2a is integrally formed at its end. On the bobbin 2a, a focus coil 3 is wound around the inner circumference, and the tracking coils 4, 5 are brought into contact with the focus coil 3 in the bobbin 2a to be wound at a predetermined position.

又，在透鏡架2之左右側面上，分別配置有互相平行的上 下各二條懸吊線6。在此所謂的上下，在物鏡驅動裝置中靠 近碟片側之處稱爲上方、上部、上面、上端，遠離碟片側之 處稱爲下方、下部、下面、下端。共計4條懸吊線6係分別 成爲透鏡架2之彈性支持體。配置於上部側的懸吊線6之一 端係被和透鏡架2 —體成型的支持部2b，及設置在亦與透鏡 架2 —體成型的支持部2b之延長線上的副支持部2c所支持 。而配置於下部側的懸吊線6之一端係被和透鏡架2 —體成 型的支持部2d，及設置在亦與透鏡架2 —體成型的支持部 2d之延長線上的副支持部2e所支持。在此，副支持部2e 與支持部2d的間隔係設定成比副支持部2c與支持部2b的 間隔更短。 然後，4條懸吊線6之另一端，分別被焊接在保持構件7 及貼附在保持構件7的印刷基板8上。印刷基板8及保持構 件7係以螺絲1 〇固定於鋼板製框架9上。因而，物鏡驅動 部係以可變位且彈性地支持於框架9上。並且，於夾著透鏡 架2之兩側面上，有朝向側面之外方向突起之抵接部2f — 體成型地設置在個別之支持部2b及2d之間。 又，設置有夾住焦點線圈3及追蹤線圈4,5、且和同一磁 -7 -Further, on the left and right side faces of the lens holder 2, two upper and lower suspension wires 6 which are parallel to each other are disposed. Here, the upper and lower sides of the objective lens driving device are referred to as the upper side, the upper portion, the upper surface, and the upper end, and the portions away from the disk side are referred to as the lower side, the lower side, the lower side, and the lower end. A total of four suspension wires 6 are respectively formed as elastic supports of the lens holder 2. One end of the suspension wire 6 disposed on the upper side is supported by a support portion 2b integrally formed with the lens holder 2, and a sub-support portion 2c provided on an extension line of the support portion 2b which is also integrally formed with the lens holder 2. On the other hand, one end of the suspension wire 6 disposed on the lower side is supported by the support portion 2d integrally formed with the lens holder 2, and the sub-support portion 2e provided on the extension line of the support portion 2d which is also formed integrally with the lens holder 2. . Here, the interval between the sub-supporting portion 2e and the supporting portion 2d is set to be shorter than the interval between the sub-supporting portion 2c and the supporting portion 2b. Then, the other ends of the four suspension wires 6 are welded to the holding member 7 and the printed substrate 8 attached to the holding member 7, respectively. The printed board 8 and the holding member 7 are fixed to the steel frame 9 by screws 1 。. Thus, the objective lens driving portion is supported on the frame 9 in a variable position and elastically. Further, on both side faces of the lens holder 2, an abutting portion 2f projecting outward in the direction of the side surface is integrally formed between the individual support portions 2b and 2d. Further, the focus coil 3 and the tracking coils 4, 5, and the same magnetic -7 are provided.

極面（N極）成對向之一對磁鐵1 1及12。一對磁鐵Π,12分 別安裝在與框架9 一體成型的對向軛1 3及1 4上。並且，與 框架9 一體化的致動器框架1 5係配置在沿著懸吊線6之兩 側面之外側附近。The pole faces (N poles) are paired with one pair of magnets 1 1 and 12. A pair of magnet turns 12 are attached to the opposing yokes 1 3 and 14 integrally formed with the frame 9. Further, the actuator frame 15 integrated with the frame 9 is disposed in the vicinity of the outer sides along both side faces of the suspension wire 6.

然後，在致動器框架1 5上，貼附設置有橫越其上端及下 端的鋼板製止動件1 7。止動件1 7係利用設置在上端部之具 有張力的爪17a，17b及設置在下端部的爪17c，17d，而被貼 附在致動器框架1 5上。在止動件1 7之上部，設置有具有與 抵接部2f互相抵接之抵接面17e的凸緣。 從磁鐵1 1及1 2產生的磁通量作用在焦點線圈3及各追蹤 線圈4,5之有效領域上。在此，藉由對焦點線圈3供給焦點 錯誤訊號，可實施與透鏡架2 —起將物鏡1驅動、而將光束 聚焦於碟片之訊號面上的控制。又，藉由對追蹤線圈4,5供 給追蹤錯誤訊號，可實施使光追隨於碟片之訊號軌跡上之追 蹤控制，因而可與透鏡架2 —起將物鏡1驅動，以追蹤記錄 於碟片上之訊號。Then, on the actuator frame 15, a steel plate stopper 17 which is provided across the upper end and the lower end thereof is attached. The stopper 17 is attached to the actuator frame 15 by the tensioned claws 17a, 17b provided at the upper end portion and the claws 17c, 17d provided at the lower end portion. At the upper portion of the stopper 17 is provided a flange having an abutting surface 17e that abuts against the abutting portion 2f. The magnetic flux generated from the magnets 1 1 and 12 acts on the effective area of the focus coil 3 and the tracking coils 4, 5. Here, by supplying the focus error signal to the focus coil 3, it is possible to perform control for driving the objective lens 1 together with the lens holder 2 to focus the light beam on the signal surface of the disc. Moreover, by supplying a tracking error signal to the tracking coils 4, 5, tracking control can be performed to follow the signal track of the disc, so that the objective lens 1 can be driven together with the lens holder 2 to track and record on the disc. Signal on.

在如此構成的物鏡驅動裝置中，貼附設置在與框架9 一體 化之左右的致動器框架1 5上的止動件1 7之抵接面1 7 e的位 置精度，及一體地設置在可動部上之抵接部2f的位置精度 係很高者。 【發明的效果】 在本發明的物鏡驅動裝置中，在光學拾訊器可動部上設置 有抵接部，在光學拾訊器可動部之左右兩側面的附近配置有 和框架成一體化之致動器框架，在該致動器框架之上部各設 置有止動件，藉由該止動件與該抵接部之抵接，可使可動 一 8 一 12¾觀貝 .. i—ί 月 E] ..... — 、 部朝向碟片方向之超出所規定之動作受到限制。在先前技術， 之以蓋來覆蓋光學拾訊器上部全體的構成中，僅可確保光學 · 拾訊器全體與碟片之間很少的間隙，但是利用本發明時，可 確保使間隙具有餘裕。 先前技術係將安裝於框架上的鋼板蓋之兩端折曲，以覆蓋 追蹤線圈及焦點線圈，而將該折曲部做爲板彈簧以做爲止動 件來使用。從而，在安裝情況不佳而產生蓋浮起時，對止動 件之接觸狀態會變成左右不平衡。相對於此，本發明係將止 動件確實地貼附在左右之指定位置上，因此對左右之止動件 __ 的基準點不會產生變化而使抵接位置均相同。因而，具有由 於蓋之浮起而使線之應力增加之危險性變少的效果。 並且，在進行使物鏡機構全體移動之切線方向的透鏡姿勢 調整時，止動件係與框架一體變位，因此與透鏡架的抵接部 可經常地確保平行的位置關係，而獲得防止產生線變形的效 果0In the objective lens driving device configured as above, the positional accuracy of the abutting surface 17 e of the stopper 17 provided on the left and right actuator frames 15 integrated with the frame 9 is attached, and is integrally provided The positional accuracy of the abutting portion 2f on the movable portion is high. [Effects of the Invention] In the objective lens driving device of the present invention, the movable portion of the optical pickup is provided with an abutting portion, and the frame is integrated with the frame in the vicinity of the left and right sides of the movable portion of the optical pickup. The actuator frame is provided with a stopper on the upper part of the actuator frame, and by the abutment of the stopper and the abutting portion, the movable frame can be moved by 8 to 123⁄4. ] ..... — The movement of the part toward the disc is restricted. In the prior art, in the configuration in which the cover covers the entire upper portion of the optical pickup, only a small gap between the optical pickup and the entire disk can be ensured, but when the present invention is used, it is ensured that the gap has a margin. . In the prior art, both ends of the steel plate cover attached to the frame are bent to cover the tracking coil and the focus coil, and the bent portion is used as a leaf spring to be used as a stopper. Therefore, when the mounting condition is not good and the cover is floated, the contact state with respect to the stopper becomes a left-right imbalance. On the other hand, in the present invention, since the stoppers are reliably attached to the left and right designated positions, the reference points of the left and right stoppers __ are not changed, and the abutment positions are the same. Therefore, there is an effect that the risk of increasing the stress of the wire due to the floating of the cover is reduced. Further, when the lens posture in the tangential direction in which the entire objective lens mechanism is moved is adjusted, the stopper is integrally displaced from the frame, so that the contact portion with the lens holder can always secure the parallel positional relationship, thereby preventing the generation of the line. The effect of deformation 0

並且，抵接部係一體地成型在透鏡架的左右兩側面之上部 及下部的支持部之間，因此強度上很優異。 (五）圖式簡單說明 第1圖係顯示本發明物鏡驅動裝置之一個實施例的立體圖 第2圖係顯示第1圖所示之物鏡驅動裝置的要部之一部分 除去之狀態的立體圖。 第3圖係從第1圖所示之物鏡驅動裝置的不同方向看去之 立體圖。 【符號之說明】 一 9一Further, since the abutting portion is integrally molded between the upper and lower side support portions of the left and right side faces of the lens holder, the strength is excellent. (5) Brief Description of the Drawings Fig. 1 is a perspective view showing an embodiment of the objective lens driving device of the present invention. Fig. 2 is a perspective view showing a state in which a part of the main portion of the objective lens driving device shown in Fig. 1 is removed. Fig. 3 is a perspective view of the objective lens driving device shown in Fig. 1 in a different direction. [Description of symbols] One 9 one

1 物鏡 2 透鏡架 2a 捲線軸 2b，2d 支持部 2 c，2 e 副支持部 2f 抵接部 3 焦點線圈 4,5 追蹤線圈 6 懸吊線 7 保持構件 8 印刷基板 9 框架 10 螺絲 11,12 磁鐵 13,14 對向軛 15 致動器框架 17 止動件 1 7a，1 7b 爪 1 7c，1 7d 爪 1 7e 抵接面1 objective lens 2 lens holder 2a spool 2b, 2d support 2 c, 2 e sub-support 2f abutment 3 focus coil 4, 5 tracking coil 6 suspension wire 7 holding member 8 printed circuit board 9 frame 10 screw 11, 12 magnet 13,14 opposite yoke 15 actuator frame 17 stopper 1 7a, 1 7b claw 1 7c, 1 7d claw 1 7e abutment surface

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Claims (1)

1_頁 年月日 第93 1 05 650號「物鏡驅動裝置」專利案 (2006年06月27日修正） 拾、申請專利範圍： 1 · 一種物鏡驅動裝置，其係將由保持物鏡用的透鏡架（lens1_页年月日日第93 1 05 650 "Objective lens driving device" patent case (corrected on June 27, 2006) Pickup, patent application scope: 1 · An objective lens driving device, which is a lens holder for holding an objective lens (lens holder)所形成的致動器可動部以對框架可變位地加以支 撑，其特徵爲：在光學拾訊器可動部上設置有抵接部，在 光學拾訊器可動部之兩外側的附近配置有和框架成一體 化之致動器框架，在該致動器框架之左右上部各設置有止 動件，藉由該止動件與該抵接部之抵接，可使可動部朝向 ‘碟片方向之所規定以外的動作受到限制。 2 ·如申請專利範圍第1項之物鏡驅動裝置，其中在以直線狀 懸吊線使致動器可動部對框架成爲可變位地支撑之透鏡 架的左右兩側面上，分別設置有抵接部。 3 ·如申請專利範圍第2項之物鏡驅動裝置，其中抵接部係一The movable portion of the actuator formed by the holder is variably supported on the frame, and is characterized in that an abutting portion is provided on the movable portion of the optical pickup, in the vicinity of the two outer sides of the movable portion of the optical pickup An actuator frame integrated with the frame is disposed, and a stopper is disposed on each of the left and right upper portions of the actuator frame. The abutting portion of the stopper member abuts the abutting portion to move the movable portion toward the ' Actions other than those specified in the disc direction are limited. [2] The objective lens driving device according to the first aspect of the invention, wherein the abutting portion is respectively provided on the left and right side surfaces of the lens holder which is supported by the movable portion of the actuator in a linear position by a linear suspension line . 3 · The objective lens driving device of claim 2, wherein the abutting portion is one 體成型配置在透鏡架之左右兩側面的上部及下部的支持 部之間。 4.如申請專利範圍第1項之物鏡驅動裝置，其中止動件係使 用鋼板製者且設置具有張力的爪，利用該爪而被貼附在致 動器框架上。 -1The body molding is disposed between the upper and lower support portions on the left and right sides of the lens holder. 4. The objective lens driving device according to claim 1, wherein the stopper is made of a steel plate and provided with a claw having a tension, and is attached to the actuator frame by the claw. -1