1281591 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種影像擷取系統及其對焦裝置，特 別是指一種利用音圈馬達（Voice Coil Motor)驅動原理的影像 擷取系統及其對焦裝置。 【先前技術】 一般之數位影像產品，如：相機手機、數位相機或攝影 機等，已被當作為紀錄影像的重要工作，在這些產品的機 ’ 才冓中’都包含有一影像擷取裝置，用以將光學影像轉換為 數位影像訊號。 在高畫質的影像擷取裝置中通常具有一物鏡模組及一 影像感測模組（如·· CCD、CM〇s)，此外，還需要有一對焦 致動裔，用以驅動物鏡模組，作平行物鏡光軸之聚焦偏差 修正’使光學影像可以正確地聚焦在影像感測模組上。 、然而，目前大部分的對焦致動器，都是使用線性馬達 • 或，電材料來驅動物鏡作偏差修正，不僅成本較高且電磁 效月b也不佳，隨著高像素及薄型趨勢，驅動物鏡作對隹修 正的致動器需求亦越來越高。 …、乂 【發明内容】 本♦明之目的’即在提供一種成本較低、磁能 使用率高的對焦裝置。 本發明之《κ 一目的’即在提供一種成本較低、磁能使 用率高的影像擷取系統。 於是 ，士义 、 本务明對焦裝置包含一承載座、一線圈組及一 1281591 磁石單元。承載座供一物鏡設置，並定義一通過物鏡的光 軸。線圈組與承載座連接且線圈組圍繞界定出一容置空間 。磁石單元設置於容置空間+，且磁石單元具有二磁石及 -夾置於磁石之間的導磁薄板’磁石相向面的極性係為相 同，其中，磁石產生之磁力線受導磁薄板改變之方向係實 質上與線圈組之繞線方向垂直，藉改變通過線圈組之電流 以使線圈組及承載座沿光軸延伸方向移動。 本發明影像擷取系統包含—物鏡、—影像感測模組及 一對焦裝置n通過物鏡的光軸。影像感測模組係接 收通過物鏡的影像光束。對焦裝置包括—承載座、一線圈 組及—磁石單元。承載座供物鏡設置，線圈組與承載座連 :且線圈組圍繞界定出一容置空間，磁石單元設置於容置 二間中，且磁石單兀具有二磁石及一夾置於磁石之間的導 磁薄板，磁石相向面的極性係為相同，其中，磁石產生之 、’、、复又‘磁溥板改變之方向係實質上與線圈組之繞線方 。〇直II改通過線圈組之電流以使線圈組及承載座沿 光軸延伸方向移動。 【實施方式】 、有關本無日月之前述及其他技術内容、特點與功效，在 、' _ 5乡考圖式之一個較佳實施例的詳細說明中，將可 清楚的呈現。 多閱圖1、圖2與圖3，本發明影像擷取系統之較佳實 施例包含一铷於 、 ’兄2、一影像感測模組3及一對焦裝置4。並 定義—通過物鏡2的光軸5。 6 1281591 對焦裝置4包括一上蓋板41、一承載座42、一基座43 、一線圈組44、一磁石單元45、一電路板46及複數彈性導 體47。基座43具有一底壁431及一由底壁431周緣向上延 伸的側壁432，底壁431上開設有一孔433，且基座43供容 置承載座4 2、線圈組44及磁石单元45，上蓋板41對鹿基 座43外型蓋設於基座43之側壁432頂緣，將承載座42、 線圈組44及磁石單元45覆蓋於基座43内，且上蓋板41對 應基座43的孔433的位置處開設有一孔4丨丨。承載座42具 有一本體421、一形成於本體421上的孔422及複數位於本 體421兩側的端子423，物鏡2係藉由孔422穿設於承載座 42上，方式包括但不限於螺合、咬合或點膠固定，線圈組 44兩端係各自連接於承載座42的端子423上，且線圈組44 圍繞界定出一容置空間441，供磁石單元Μ設置，磁石單 元45底部可貼合於基座43底壁431上且磁石單元45具有 上、下設置的二磁石451及一夾置於二磁石451間的導磁薄 板452 ’ —者構成一三明治結構，導磁薄板扣板面垂直光 軸5，^上下兩磁石451相向面的極性係相同，須注意的是 、磁:早& 45係與線圈'组44間隔一固定距離，也就是說， 兹石早το 45與線圈組44不接觸，且線圈組44繞線方向垂 直先軸5方向。線圈組44必須圍繞在導磁薄板452周圍， =導磁薄板452沿光軸5方向的厚度為,，線圈組料在光 =方向的移動範圍為”線圈組44沿光轴5方向的繞線高 度為A ’線圈組44在光叙太6 < μ必乂 > f 的移動_⑺内必須涵 導兹〉專板4 5 2的厚詹f ^ ()，也就疋說線圈組44繞線的高 7 1281591 度（A )必須大於導磁薄板452厚度（/)加上運動的範圍（ s)，即+ s。電路板46係固定於基座43的側壁432外壁 面上，且彈性導體47為長條狀，一端固定於電路板46，另 一端則延伸進入基座43内部與承載座42的端子423電連接 (如焊接），彈性導體47可將承載座42及線圈組44支撐懸 吊在基座43内，且基座43的側壁432供彈性導體47穿過 處對應凹設複數凹槽空間434。 衫像感測模組3包括一電荷|馬合元件3 1 (CCD戍 CMOS)及一軟性電路板32(FPC)，軟性電路板32係位於基 座43及電路板46下方，而電荷耦合元件31則設置於軟性 電路板32上且其位置對應基座43底壁431上的孔433。 上述僅為本實施例的元件介紹，以下將詳述其組裝關 係及作動原理。 參閱圖4〜7，物鏡2係穿設於承載座42的孔422上， 且上蓋板41的孔411的孔徑大於物鏡2的直徑，因此物鏡 2可在上蓋板41的孔411内上下移動，且上蓋板41的孔 411、承載座42的孔422及基座43的孔433係位於光軸5 上’也就疋二者連線方向與光軸5方向（對焦方向）相同，藉 此，影像光束進入物鏡3後，可依次通過上蓋板4丨的孔 411、承載座42的孔422及基座43的孔433，最後打至 CCD31上。接著，磁石單元45設置於基座43及上蓋板41 之間’線圈組44圍繞呈方框且磁石單元45設於方框内，線 圈組44與承載座42連接，且線圈組44與承載座42藉彈性 V體47支撐懸吊於電路板上，而電路板〇則裝置於基 8 1281591 二4;上，彈性導體47材質可為銅合金，例如鈹銅 (Γ ㈣，彈性導體47藉由電路板47可輸入電 抓至線圈組44，磁石單元45呈二 主一月/口結構（參閱圖8)，也 兩磁石451中間央導磁薄板452，導磁薄板叫 軸5,導磁薄板452材質包括但不限於石夕鋼板或碳 =了_均勾’本實施例中，磁石451相向面係 =導：早元45最上及最下的面係為S極，而線圈組44 二專板452旁，圖8右侧係表示線圈電流進入紙面， 圖8左側係表示線圈電流穿出紙面，受到導磁薄板 :兩磁石451產生的磁力線受導磁薄板扣改變之方向係^ 貝上與線圈組44之繞線方向垂直，而由安培定律可知，線 向為向上的方向，如果改變電流方向，也就 =圖8右側改為線圈電流穿出紙面，圖8左側改為線圈電 進入紙面’則線圈組44受力方向為向下的方向，因此， 精改變通過線圈組44之電流可使線圈組44及承载座… =5延伸方向移動，以達到物鏡2沿光軸5方向的聽 修正。 、此外，熟習該項技藝者當知，磁石單元45並不限於二 磁石451及-導磁薄板452 ’參閱圖9,磁石單元c亦可 包括三磁石451及二導磁薄板扣，導磁薄板松同樣位於 兩兩磁石之間’導磁薄板452板面垂直光軸5,且磁石⑸ 相向面極性相同，也就是如圖9所示，上面二磁 向面為Ν極’下面二磁石相向面則為S極，當然線圈組44 也可對隸有二線圈’且上下線圈之電流進出方向相反， 1281591 又到導磁4板452影響，兩磁石451產生的磁力線受導磁薄 板452改變之方向係實質上與線圈組μ之繞線方向垂直， 藉此’改變通過線圈組44之電流可使線圈組44及承載座 42沿光軸5延伸方向移動，以達到物鏡2沿光軸5方向的 對焦修正。當然，熟習該項技藝者當知，上述磁石451及 導磁薄板452冑目僅為舉例說明，實質上，本發明範圍包 括n個磁石451及η it α @ , 及（n 1)片導磁薄板452的情況，其中n大 於或等於2。1281591 IX. Description of the Invention: [Technical Field] The present invention relates to an image capturing system and a focusing device thereof, and more particularly to an image capturing system using a voice coil motor (Voice Coil Motor) driving principle and Focusing device. [Prior Art] General digital image products, such as camera phones, digital cameras or video cameras, have been used as important tasks for recording images. In the machine's 'products', there is an image capture device. To convert an optical image into a digital image signal. In the high-quality image capturing device, there is usually an objective lens module and an image sensing module (such as CCD, CM〇s), in addition, a focus actuating device is needed to drive the objective lens module. For the focus deviation correction of the optical axis of the parallel objective lens, the optical image can be correctly focused on the image sensing module. However, most of the current focus actuators use a linear motor or electric material to drive the objective lens for deviation correction, which is not only costly but also has an excellent electromagnetic efficiency. With high pixel and thin trend, The need to drive the objective lens for correcting the actuator is also increasing. ..., 乂 [Summary of the Invention] The purpose of the present invention is to provide a focusing device having a low cost and a high magnetic energy utilization rate. The "kappa" of the present invention provides an image capturing system which is low in cost and high in magnetic usability. Therefore, the Shiyi and Benming focusing devices include a carrier, a coil set and a 1281591 magnet unit. The carrier is provided for an objective lens and defines an optical axis through the objective lens. The coil set is coupled to the carrier and the coil set defines an accommodation space. The magnet unit is disposed in the accommodating space +, and the magnet unit has two magnets and the magnetic conductive sheet of the magnetized magnet sheet sandwiched between the magnets has the same polarity, wherein the magnetic field lines generated by the magnet are changed by the magnetic conductive sheet. The line is substantially perpendicular to the winding direction of the coil group, and the current passing through the coil group is changed to move the coil group and the carrier in the direction in which the optical axis extends. The image capturing system of the present invention comprises an objective lens, an image sensing module and a focusing device n passing through the optical axis of the objective lens. The image sensing module receives the image beam passing through the objective lens. The focusing device includes a carrier, a coil set, and a magnet unit. The bearing seat is provided for the objective lens, and the coil group is connected with the bearing seat: the coil group defines an accommodating space, the magnet unit is disposed in the accommodating two, and the magnet single cymbal has two magnets and one clip is placed between the magnets. In the magnetic conductive sheet, the polarities of the magnet facing surfaces are the same, wherein the direction in which the magnets are generated, and the magnetic yoke changes substantially in the direction of the winding of the coil group. The straight II changes the current through the coil set to move the coil set and the carrier in the direction in which the optical axis extends. [Embodiment] The foregoing and other technical contents, features, and effects of the present invention will be clearly described in the detailed description of a preferred embodiment of the ' _ 5 township chart. Referring to Figures 1, 2 and 3, a preferred embodiment of the image capture system of the present invention comprises a "brother' 2, an image sensing module 3 and a focusing device 4. And defined - through the optical axis 5 of the objective lens 2. 6 1281591 The focusing device 4 includes an upper cover 41, a carrier 42, a base 43, a coil assembly 44, a magnet unit 45, a circuit board 46, and a plurality of elastic conductors 47. The base 43 has a bottom wall 431 and a side wall 432 extending upward from the periphery of the bottom wall 431. The bottom wall 431 defines a hole 433, and the base 43 accommodates the carrier 4, the coil assembly 44 and the magnet unit 45. The upper cover 41 is disposed on the top edge of the side wall 432 of the base 43 of the deer base 43 , and covers the base 42 , the coil assembly 44 and the magnet unit 45 in the base 43 , and the upper cover 41 corresponds to the base A hole 4 is formed at the position of the hole 433 of 43. The carrier 42 has a body 421, a hole 422 formed in the body 421, and a plurality of terminals 423 on both sides of the body 421. The objective lens 2 is disposed on the carrier 42 through the hole 422, including but not limited to screwing. , the occlusal or the dispensing is fixed, the two ends of the coil assembly 44 are respectively connected to the terminal 423 of the carrier 42, and the coil group 44 defines an accommodating space 441 for the magnet unit ,, and the bottom of the magnet unit 45 can be fitted. On the bottom wall 431 of the base 43 and the magnet unit 45 has two magnets 451 disposed above and below and a magnetic conductive sheet 452 ′ sandwiched between the two magnets 451 constituting a sandwich structure, the magnetic conductive thin plate gusset surface is vertical The optical axis 5, ^ the upper and lower magnets 451 opposite faces have the same polarity, it should be noted that the magnetic: early & 45 series and the coil 'group 44 are separated by a fixed distance, that is, the stone is early το 45 and the coil set 44 is not in contact, and the coil group 44 is perpendicular to the first axis 5 direction. The coil group 44 must be surrounded by the magnetic conductive sheet 452, = the thickness of the magnetic conductive sheet 452 in the direction of the optical axis 5, and the range of movement of the coil assembly in the light = direction is "the winding of the coil group 44 in the direction of the optical axis 5". The height of the A' coil group 44 must be in the movement _(7) of the light 太 6 6 < μ 乂 乂 f 〉 〉 〉 〉 〉 〉 〉 4 4 4 4 4 4 4 4 4 4 线圈 线圈 线圈 线圈 线圈 线圈 线圈 线圈The height of the winding 7 1281591 degrees (A) must be greater than the thickness (/) of the magnetic conductive sheet 452 plus the range of motion (s), ie, + s. The circuit board 46 is fixed to the outer wall surface of the side wall 432 of the base 43, and The elastic conductor 47 has an elongated shape, one end is fixed to the circuit board 46, and the other end extends into the interior of the base 43 to be electrically connected (such as soldered) to the terminal 423 of the carrier 42, and the elastic conductor 47 can carry the carrier 42 and the coil assembly 44. The support is suspended in the base 43 and the side wall 432 of the base 43 is provided with a recessed recessed space 434 for the elastic conductor 47 to pass therethrough. The shirt image sensing module 3 includes a charge|horse component 3 1 (CCD戍 CMOS) and a flexible circuit board 32 (FPC), the flexible circuit board 32 is located under the pedestal 43 and the circuit board 46, and the charge coupled device 31 is disposed on The flexible circuit board 32 has a position corresponding to the hole 433 in the bottom wall 431 of the base 43. The above is only an introduction of the components of the embodiment, and the assembly relationship and the operation principle thereof will be described in detail below. Referring to Figures 4 to 7, the objective lens 2 is The hole 411 of the upper cover 41 is larger than the diameter of the objective lens 2, so that the objective lens 2 can move up and down in the hole 411 of the upper cover 41, and the hole of the upper cover 41 411, the hole 422 of the carrier 42 and the hole 433 of the base 43 are located on the optical axis 5 'that is, the connection direction is the same as the direction of the optical axis 5 (focus direction), whereby the image beam enters the objective lens 3 The hole 411 of the upper cover 4, the hole 422 of the carrier 42 and the hole 433 of the base 43 are sequentially passed to the CCD 31. Then, the magnet unit 45 is disposed between the base 43 and the upper cover 41. The coil assembly 44 is surrounded by a frame and the magnet unit 45 is disposed in the frame. The coil assembly 44 is coupled to the carrier 42 and the coil assembly 44 and the carrier 42 are supported by the elastic V body 47 and suspended from the circuit board. The plate is mounted on the base 8 1281591 2-4; the elastic conductor 47 may be made of a copper alloy, such as beryllium copper (Γ (4), The conductive conductor 47 can be electrically input to the coil assembly 44 by the circuit board 47. The magnet unit 45 has a two main month/port structure (refer to FIG. 8), and the two magnets 451 are centrally guided by the magnetic thin plate 452. The magnetic conductive thin plate is called an axis. 5, the magnetic conductive sheet 452 material includes, but is not limited to, Shixi steel plate or carbon = _ uniform hook. In this embodiment, the magnet 451 facing surface system = guide: the uppermost and lowermost surface of the early 45 is the S pole, and The coil group 44 is next to the second board 452. The right side of Fig. 8 indicates that the coil current enters the paper surface. The left side of Fig. 8 indicates that the coil current passes through the paper surface, and is guided by the magnetic conductive sheet: the magnetic lines of force generated by the two magnets 451 are changed by the magnetic conductive thin plate buckle. The line is perpendicular to the winding direction of the coil group 44. According to Ampere's law, the line direction is the upward direction. If the current direction is changed, the right side of the figure 8 is changed to the coil current to pass through the paper surface. When the coil is electrically connected to the paper surface, the direction of the force of the coil assembly 44 is downward. Therefore, the current passing through the coil assembly 44 can be changed to move the coil assembly 44 and the carrier ... 5 in the extending direction to achieve the objective lens 2 along the light. Correction of the axis 5 direction. In addition, those skilled in the art are aware that the magnet unit 45 is not limited to the two magnets 451 and the magnetically conductive sheet 452'. Referring to FIG. 9, the magnet unit c may also include a three magnet 451 and a two magnetic thin plate buckle, and a magnetic conductive sheet. The pine is also located between the two magnets. The magnetic axis of the magnetic thin plate 452 is perpendicular to the optical axis 5, and the magnets (5) have the same polarity on the opposite side, that is, as shown in Fig. 9, the upper two magnetic directions are the lower two magnet faces. Then, it is an S pole. Of course, the coil group 44 can also have two coils' and the currents of the upper and lower coils are opposite to each other. The 1281591 is also influenced by the magnetic conductive plate 4, and the magnetic lines of force generated by the two magnets 451 are changed by the magnetic conductive sheet 452. It is substantially perpendicular to the winding direction of the coil group μ, whereby the current passing through the coil assembly 44 can be changed to move the coil assembly 44 and the carrier 42 in the direction in which the optical axis 5 extends to achieve the objective lens 2 in the direction of the optical axis 5. Focus correction. Of course, those skilled in the art are aware that the magnet 451 and the magnetic conductive sheet 452 are merely illustrative. In essence, the scope of the present invention includes n magnets 451 and η it α @ , and (n 1) sheets are magnetically conductive. The case of sheet 452, where n is greater than or equal to two.
特別-兒明的疋’上述線圈組44雖係以圍繞呈方框說明 ’但線圈組44及磁石單& 45之形狀不應以此為限。 較佳地’本實施财’也可於物鏡2外設置—保護蓋6 用以封閉上蓋板41的孔433及保護物鏡2。 斤述利用本發明影像擷取***，不僅構造簡單 、成，較低、薄型化，且提供—種三明治結構的磁石翠元 法的=導磁薄板452纟改變及均勻化磁場，且藉輸入電 :的^以達到㈣線圈組44、承载座42及物鏡2沿光軸 万向（對焦方向）的移動來修正對焦。 ▲惟以上所述者，僅為本發明之較佳實施例而已，當不 ，以此限定本發明實施之範圍’即大凡依本發明申請: 孝巳圍及發明說明内容所作之簡單的等效變化與修飾，皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖】是-立體分解圖，說明本發明影像 較佳實施例； 系統之一 10 1281591 圖2是一該較佳實施例的俯視圖； 圖3是一該較佳實施例的後視圖； 圖4是沿圖3中的直線I - I所取的一剖視圖； 圖5是沿圖3中的直線Π - Π所取的一剖視圖； 圖6是沿圖2中的直線HI -Π所取的一剖視圖； 圖7是沿圖2中的直線IV -IV所取的一剖視圖； 圖8是一示意圖，說明一磁石單元及一線圈組；及 圖9是一示意圖，說明該磁石單元具有三磁石及二導 磁薄板。 11 1281591 【主要元件符號說明】 2…… 物鏡 32 ···.· …·軟性電路板 3…… 衫像感測板組 411···· —孔 4…… •…對焦裝置 421… …·本體 5…… —光軸 422… •…孔 6…… •…保護蓋 423… .···端子 41••… •…上蓋板 431… …·底壁 42.···· •…承載座 432… …·側壁 43••… …·基座 433… •…孔 44••… •…線圈組 434… •…凹槽空間 45••… •…磁石早元 441… •…容置空間 46••… •…電路板 451… •…磁石 47·.··· •…彈性導體 452… V磁薄板 31••… 電何麵合元件 12In particular, the above-mentioned coil group 44 is surrounded by a square frame, but the shape of the coil group 44 and the magnet stone & 45 should not be limited thereto. Preferably, the present invention can also be disposed outside the objective lens 2 - a protective cover 6 for closing the hole 433 of the upper cover 41 and protecting the objective lens 2. The use of the image capturing system of the present invention not only has a simple structure, is formed, is low, and is thin, and provides a magnetic structure of the sandwich structure, the magnetic conductive sheet 452, changes and homogenizes the magnetic field, and borrows input power. The focus of the (4) coil group 44, the carrier 42 and the objective lens 2 along the optical axis (focus direction) is used to correct the focus. ▲ However, the above is only the preferred embodiment of the present invention, and if not, the scope of the present invention is limited to the extent that the present invention is applied in accordance with the present invention: Simple equivalent changes made by Xiao Yuwei and the description of the invention. And modifications are still within the scope of the invention patent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 2 is a top view of a preferred embodiment of the present invention; FIG. 2 is a plan view of a preferred embodiment of the preferred embodiment; FIG. Figure 4 is a cross-sectional view taken along line I - I in Figure 3; Figure 5 is a cross-sectional view taken along line Π - 图 in Figure 3; Figure 6 is a line HI along Figure 2 - Figure 7 is a cross-sectional view taken along line IV-IV of Figure 2; Figure 8 is a schematic view showing a magnet unit and a coil assembly; and Figure 9 is a schematic view showing the magnet The unit has three magnets and two magnetic thin plates. 11 1281591 [Description of main component symbols] 2... Objective lens 32 ·······Soft circuit board 3... Shirt image sensing board group 411····-hole 4... •... Focusing device 421... Body 5... - Optical axis 422... •... Hole 6... •... Protective cover 423... Terminals 41••... • Upper cover 431... ...Bottom wall 42.····•... Block 432...·Sidewall 43••... pedestal 433... •... hole 44••... •...coil set 434... •...groove space 45••... •... magnet early 441... •... accommodating space 46••... •...Board 451... •...Magnetic 47·····•...elastic conductor 452...V magnetic thin plate 31••... Electrically facing component 12