201012032 九、發明說明： .【發明所屬之技術領域】 . 本發明涉及一種音圈馬達，尤其涉及一種結構簡單之 音圈馬達。 【先前技術】 音圈馬達具有體積小、用電量少及價格低廉等優點， 適合作為電子產品（如數位相機、行動電話、數位攝像機 等）中之致動器（請參見 Design of a voice coil motor used in 參 the focusing system of a digital video camera，Magnetics, IEEE Transactions on Volume 41, Issue 10, Oct. 2005 Page(s):3979 - 3981)。 習知之音圈馬達一般具有一兩端開口之固定裝組、一 活動地收容於固定裝組内之活動裝組、兩個分別位於固定 裝組兩端之彈片、兩個用於確保彈片與固定裝組之結合性 穩定之彈片蓋及一用於承載該固定裝組、彈片及彈片蓋之 承載體。惟，該音圈馬達元件較多，成本較高，組裝過程 β較麻煩^ 【發明内容】 有鑒於此，提供一種元件較少、結構較簡單之音圈馬 達實為必要。 一種音圈馬達，其包括： 一兩端開口之活動裝筒，其外壁繞有一線圈； 一固定裝組，該固定裝組包括一固定體及至少一裝設 於該固定體上之磁鐵，該固定體具有侧壁及一與該側壁一 201012032 體成型之底板，該側壁與該底板圍成一容置腔，該容置腔 用來收容該活動裝筒，且該活動裝筒之與該底板相對之端 -部設有至少兩個定位柱，該定位柱抵接於該固定體之底板。 與先前技術相比，本發明實施例所提供之音圈馬達之 固定裝組具有一底板，該活動裝筒與該底板相對之端部具 有至少兩個定位柱，該定位柱抵接於該固定裝組之底板， 從而使得該音圈馬達之元件較少，結構較簡單。 【實施方式】 ❹ 凊參閱圖1及圖2,其為本發明實施例所提供之音圈馬 達10，該音圈馬達10可供一鏡頭模組使用。該音圈馬達 10包括··外殼20、固定裝組30、活動裝組4〇、第一彈片 50及第二彈片60。 該外殼20用於消除外部電磁對該音圈馬達1()之干擾 並防止該音圈馬達1Q之電磁影響其外部電子元件之工作。 該外殼20可藉由鎳鐵合金、導電塑膠、表面導電材料、導 電玻璃等磁遮罩材料製成。該外殼2Q具有—頂板A兩個 設置於頂板22相對兩侧之第—側板％及兩㈣置於頂板 22之另外相對兩侧之第二側板26。該頂板22、兩個第一側 & 24 板26形成一用來容置固定裝組30之容 置空間。5亥頂板22夕Mi y-r 〇β 之4何中心開設一通孔222，用於光線 射入鏡頭模組中。 “疋裝組30具有一固定體32及四塊裝設於固定體 32中之磁鐵34。本實施例中，該固定體32係-呈正方體 筒狀之架體’其具有四個方形側壁321及-與侧壁321 一 201012032 體成型之底板322。該固定體32之四個方形側壁321及底 • 板322圍成一第一容置腔323，該第一容置腔323用來收容 - 活動裝組40。此時，該四個方形侧壁321即組成該固定體 3 2之側壁。 每一側壁321上開設有一置磁部324，用來放置磁鐵 34。相鄰兩侧壁321相交形成一條棱325，共形成四條棱 325。棱325與該固定體32之中心軸平行，且沿中心軸方 向向固定體32之頂部延伸形成四個第一定位單元326。該 ©第一定位單元326用來將固定體32與第二彈片60定位並 固定。本實施例中，該第一定位單元326為定位柱。當然， 該第一定位單元326亦可為定位孔。 當然，該第一定位單元326亦可單獨成型，再藉由膠 合黏結、螺接等其他固接方法與固定體32固接為一體。 當然，該第一定位單元326之個數亦可為兩個、三個 或五個或更多個。 當然，亦可不需要第一定位單元326。 胃 該底板322具有一内表面3221及與内表面3221相對 之外表面3222。該底板322之内表面3221向外表面3222 凹陷形成一凹槽327。該凹槽327具有一底面3272。該凹 槽327之中央設置一通孔3273,使得光線可穿過底板322。 該活動裝組40裝設於固定體32之第一容置腔323中。 該活動裝組40具有一活動裝筒41及繞於該活動裝筒41外 壁之線圈42。該活動裝筒41為一具有大致呈圓形之第二容 置腔402之方形結構。該第二容置腔402用來收容鏡頭模 8 201012032 組中之鏡筒（圖未示）。 • 該第二容置腔402之側壁沿平行於活動裝筒41之中心 - 軸方向朝向底板322延伸形成四個第一定位柱412，背離底 板322延伸形成四個第二定位柱413。該第一定位柱412 用來與第一彈片50定位及固定，該第二定位柱413用來與 第二彈片60定位及固定。 當然，該第一定位柱412或第二定位柱413之個數亦 可為兩個、三個、五個或更多個。 參 該第一彈片50具有一方形平板51。該平板51之幾何 中心開設有一通孔510,該通孔510用於光線穿過第一彈片 50 ° 該平板51具有一圍繞該通孔510且遠離該通孔510之 外框53、一圍繞該通孔510且靠近該通孔510之内框54 及四個位於該外框53及内框54之間之彈力部55。 當然，該彈力部55之個數亦可為兩個或三個或更多個。 該外框53還設有複數點膠孔531。該點膠孔531可將 ®該第一彈片50之外框53與該底板322之内表面3221固接 為一體。當然，亦可沒有點膠孔531。 該内框54開設有與第一定位柱412配合使用之凹口 541。該凹口 541之開口方向朝向通孔510且與通孔510相 連通。該凹口 541與第一定位柱412相配合將第一彈片50 與活動裝筒41定位並固定。為了使得第一彈片50與活動 裝筒41固定之更牢，亦可於凹口 541與第一定位柱412之 間點膠。當然，該凹口 541亦可為與該通孔510不連通之 201012032 孑L 。 • 該凹口 541使得該第一定位柱412穿過第一彈片50以 • 抵接於凹槽327之底面3272，從而使得組裝好之處於非使 用狀態下之第一彈片50之外框53與内框54分別處於不同 之平面上。 該第二彈片60具有一方形平板61。該平板61之面積 大於第一彈片50之面積。該平板61之幾何中心開設有一 通孔610，該通孔610用於光線穿過第二彈>；60。 參 該平板61具有一圍繞該通孔610且遠離該通孔610之 外框63、一圍繞該通孔610且靠近該通孔610之内框64 及四個位於該外框63及内框64之間之彈力部65。 當然，該彈力部65之個數亦可為兩個或三個或更多個。 該外框63還具有四個與第一定位單元326配合使用之 定位孔66。該定位孔66與第一定位單元326相配合將第二 彈片60與固定體32定位並固定。為了使得第二彈片60與 固定體32固定之更牢，亦可於定位孔66與第一定位單元 參326之間點膠。 該内框64開設有與第二定位柱413配合使用之凹口 641。該凹口 641之開口方向朝向通孔610且與通孔610相 連通。該凹口 641與第二定位柱413相配合將第二彈片60 與活動裝筒41定位並固定。為了使得第二彈片60與活動 裝筒41固定之更牢，亦可於凹口 641與第二定位柱413之 間點膠。當然，該凹口 641亦可為與該通孔610不連通之 201012032 將線圈42與外部電路連通，使線圈42内有電流流動， • 而通有電流之線圈42於固定裝組30產生之磁場中受到力 • 之作用，帶動活動裝筒41沿其中心軸方向移動。 當然，該外殼20亦可為圓形、三角形、五邊形或六邊 形等其他幾何形狀結構。 當然，亦可只有第一彈片50或只有第二彈片60。 請參閱圖3,其為本發明第二實施例所提供之固定裝組 30b。該固定裝組30b具有一環狀固定體32b及一裝設於固 ⑩定體32b上之圓環形磁鐵34b，該固定體32b為一具有與侧 壁一體成型之底板322b之筒狀結構，其具有一圓環形之第 一端面35b及與該第一端面35b相對之第二端面36b，該第 一端面35b向該第二端面36b陷形成一與該固定體32b同 軸之圓環形置磁部307b，該置磁部307b用來收容該磁鐵 34b，且該置磁部307b之形狀與磁鐵34b之形狀相匹配， 以使該磁鐵34b緊密地收容於該置磁部307b中，該固定體 32b之内壁上還開設有三個間隔分佈之孔309b，以使磁鐵 @ 34b部分露出。.當然，彈片及活動裝組應相應之變為與固定 裝組30b相匹配之形狀。 可理解，該三個孔309b亦可連為一孔。 當然，該第二容置腔307b亦可由固定體32b之内壁向 其外壁凹陷形成。 請參閱圖4，其為本發明第三實施例所提供之固定裝組 30c。該固定裝組30c具有一固定體32c及兩個裝設於固定 體32c上之圓弧形磁鐵34c，該固定體32c為一具有與側壁 11 201012032 一體成型之底板322c之筒狀結構，其具有一圓環形之第一 * 端面35c及與該第一端面35c相對之第二端面36c，該第一 - 端面35c具有兩個圓弧形之第一側壁端面305c，該第二端 面36c具有兩個分別與兩個第一側壁端面305c相對之第二 側壁端面306c，該第一侧壁端面305c向與其相對之第二側 壁端面306c凹陷形成一圓弧形之置磁部307c，該置磁部 307c用來收容該磁鐵34c，且該置磁部34c之形狀與該磁鐵 34c之形狀相匹配，以使該磁鐵34c緊密地收容於該置磁部 ❿34c中，該固定體32c之内壁上還開設有兩個間隔分佈之孔 309c，以使磁鐵34c部分露出。當然，彈片及活動裝組應 相應之變為與固定裝組30c相匹配之形狀。 當然，該置磁部307c亦可由固定體32c之内壁向其外 壁凹陷形成。 請參閱圖5,其為本發明第四實施例所提供之固定裝組 30d，該固定裝組30d具有一固定體32d及四個裝設於固定 體32d上之圓弧形磁鐵34d，該固定體32d為一具有與側壁 ® —體成型之底板322d之筒狀結構，其具有一圓角形之環狀 之第一端面35d及與該第一端面35d相對之第二端面36d， 該第一端面35d之位於四個圓角處之部分端面向該第二端 面36d之位於四個圓角處之部分端面凹陷形成四個圓弧形 之置磁部307d，該置磁部307d用來收容該磁鐵34d，且該 置磁部307d之形狀與該磁鐵34d之形狀相匹配，以使該磁 鐵34d緊密地收容於該置磁部307d中，該固定體32d之四 個圓角處之内壁上還分別開設有孔309d，以使磁鐵34d部 12 201012032 分露出。當然，彈片及活動裝組應相應之變為與固定裝組 • 30d相匹配之形狀。 • 當然，該置磁部307d亦可由固定體32d之内壁向其外 壁凹陷形成。 可理解，該磁鐵之個數亦可為五個、六個或更多個， 不限於本實施例，只要該固定體設有個數與磁鐵個數相同 之置磁部即可。 當然’該固定體亦可為三角形、四邊形、五邊形、六 粵邊形等其他幾何結構。 當然，若該固定體由磁鐵可吸附之材料（例如鎳鐵、 不錢鐵或鐘辞鐵等）製成，則’此時可將磁鐵直接吸附於 固定體之内壁上。 综上所述，本發明確已符合發明專利之要件，遂依法 提出專利申請。惟，以上所述者僅為本發明之較佳實施方 式’自不能以此限制本案之申請專利範圍。舉凡熟悉本案 ❿技藝之人士援依本發明之精神所作之等效修飾或變化，皆 應涵蓋於以下申請專利範圍内。 【圖式簡單說明】 土圖1係本發明第一實施例所提供之音圈馬達之組合示 意圖’其包括固定裝組。 圖2係本發明第一實施例所提供之音圈馬達之分解示 意圖。 圖3係本發明第二實施例所提供之固定裝組之示意圖。 圖4係本發明第三實施例所提供之固定裝組之示意圖。 13 201012032 圖5係本發明第四實施例所提供之固定裝組之示意圖 •【主要元件符號說明】 • 音圈馬達 10 外殼 20 固定裝組 30、30b、30c、30d 活動裝組 40 第一彈片 50 第二彈片 60 頂板 22 第一侧板 24 第二側板 26 通孑L 222、3273、510、610 固定體 32、32b、32c、32d 磁鐵 34、34b、34c、34d 侧壁 321 底板 ® 第-容置腔 322、322b、322c、322d 323 置磁部 324、307b、307c、307d 棱 325 第一定位單元 326 内表面 3221 外表面 3222 凹槽 327 底面 3272 14 201012032 第二容置腔 402 ' 活動裝筒 41 * 第一定位柱 412 第—定位柱 413 線圈 42 平板 51、61 外框 53、63 内框 54、64 Φ 彈力部 55、65 點膠孔 531 凹口 541 、 641 定位孔 66 第一端面 35b 、 35c 、 35d 第一端面 36b ' 36c、36d 孔 309b ' 309c ' 309d 第一側壁端面 第二側壁端面 305c 306c 15201012032 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a voice coil motor, and more particularly to a voice coil motor having a simple structure. [Prior Art] The voice coil motor has the advantages of small size, low power consumption, and low price, and is suitable as an actuator in electronic products (such as digital cameras, mobile phones, digital cameras, etc.) (see Design of a voice coil). Motor used in the focusing system of a digital video camera, Magnetics, IEEE Transactions on Volume 41, Issue 10, Oct. 2005 Page(s): 3979-3981). The conventional voice coil motor generally has a fixed assembly with two open ends, a movable assembly that is movably accommodated in the fixed assembly, two elastic pieces respectively located at the two ends of the fixed assembly, and two for ensuring the elastic and fixed The assembled elastic cover of the assembly and a carrier for carrying the fixed assembly, the elastic piece and the elastic cover. However, the voice coil motor has many components and high cost, and the assembly process β is troublesome. [Invention] In view of the above, it is necessary to provide a voice coil motor with fewer components and a simple structure. A voice coil motor comprising: a movable barrel with an open end, the outer wall of which has a coil; a fixed assembly, the fixed assembly includes a fixed body and at least one magnet mounted on the fixed body, The fixing body has a side wall and a bottom plate formed integrally with the side wall 201012032, the side wall and the bottom plate enclose a receiving cavity, the receiving cavity is for receiving the movable loading tube, and the movable loading tube and the bottom plate The opposite end portion is provided with at least two positioning posts, and the positioning post abuts against the bottom plate of the fixing body. Compared with the prior art, the fixed assembly of the voice coil motor provided by the embodiment of the present invention has a bottom plate, and the end of the movable loading tube opposite to the bottom plate has at least two positioning posts, and the positioning post abuts the fixing The bottom plate of the assembly is assembled, so that the voice coil motor has fewer components and a simple structure. [Embodiment] Referring to Figures 1 and 2, a voice coil motor 10 according to an embodiment of the present invention is provided. The voice coil motor 10 can be used by a lens module. The voice coil motor 10 includes a housing 20, a fixed assembly 30, a movable assembly 4, a first elastic piece 50, and a second elastic piece 60. The outer casing 20 serves to eliminate the interference of the external electromagnetic force to the voice coil motor 1 () and prevent the electromagnetic of the voice coil motor 1Q from affecting the operation of its external electronic components. The outer casing 20 can be made of a magnetic mask material such as a nickel-iron alloy, a conductive plastic, a surface conductive material, or a conductive glass. The outer casing 2Q has a second side plate 26 which is disposed on the opposite sides of the top plate 22, and two (4) second side plates 26 which are disposed on opposite sides of the top plate 22. The top plate 22 and the two first side & 24 plates 26 define a receiving space for receiving the fixed assembly 30. 5 Haiding top 22 On the eve of the Mi y-r 〇β 4, a through hole 222 is opened for the light to enter the lens module. The armor assembly 30 has a fixed body 32 and four magnets 34 mounted in the fixed body 32. In the present embodiment, the fixed body 32 is a frame having a rectangular parallelepiped shape and has four square side walls 321 And a bottom plate 322 formed by the side wall 321 a 201012032. The four square side walls 321 and the bottom plate 322 of the fixed body 32 define a first accommodating cavity 323 for receiving the first accommodating cavity 323. The movable assembly 40. At this time, the four square side walls 321 constitute the side walls of the fixed body 32. Each of the side walls 321 defines a magnetic portion 324 for placing the magnet 34. The adjacent two side walls 321 intersect. A rib 325 is formed, and a total of four ribs 325 are formed. The rib 325 is parallel to the central axis of the fixed body 32, and extends toward the top of the fixed body 32 along the central axis direction to form four first positioning units 326. The first positioning unit 326 is used to position and fix the fixed body 32 and the second elastic piece 60. In this embodiment, the first positioning unit 326 is a positioning post. Of course, the first positioning unit 326 can also be a positioning hole. The positioning unit 326 can also be separately formed, and then bonded and screwed, etc. The fixing method is fixed to the fixed body 32. Of course, the number of the first positioning units 326 may also be two, three or five or more. Of course, the first positioning unit 326 may not be needed. The bottom plate 322 has an inner surface 3221 and an outer surface 3222 opposite to the inner surface 3221. The inner surface 3221 of the bottom plate 322 is recessed toward the outer surface 3222 to form a recess 327. The recess 327 has a bottom surface 3272. A through hole 3273 is disposed in the center of the 327, so that the light can pass through the bottom plate 322. The movable assembly 40 is mounted in the first accommodating cavity 323 of the fixed body 32. The movable assembly 40 has a movable loading tube 41 and a coil 42 of the outer wall of the movable cylinder 41. The movable cylinder 41 is a square structure having a substantially circular second accommodating cavity 402. The second accommodating cavity 402 is used for accommodating the lens module 8 in the 201012032 group. a lens barrel (not shown). The sidewall of the second accommodating cavity 402 extends parallel to the center-axis direction of the movable cylinder 41 toward the bottom plate 322 to form four first positioning posts 412 extending away from the bottom plate 322 to form four. a second positioning post 413. The first positioning post 412 is used to The second positioning post 413 is used for positioning and fixing with the second elastic piece 60. Of course, the number of the first positioning post 412 or the second positioning post 413 may also be two or three. There are five or more. The first elastic piece 50 has a square flat plate 51. The geometric center of the flat plate 51 defines a through hole 510 for the light to pass through the first elastic piece 50°. An inner frame 54 surrounding the through hole 510 and away from the through hole 510, an inner frame 54 surrounding the through hole 510 and adjacent to the through hole 510, and four elastic portions 55 located between the outer frame 53 and the inner frame 54 . Of course, the number of the elastic portions 55 may also be two or three or more. The outer frame 53 is also provided with a plurality of dispensing holes 531. The dispensing hole 531 can fix the outer frame 53 of the first elastic piece 50 and the inner surface 3221 of the bottom plate 322 into one body. Of course, there may be no glue holes 531. The inner frame 54 is provided with a notch 541 for use with the first positioning post 412. The opening direction of the recess 541 faces the through hole 510 and communicates with the through hole 510. The notch 541 cooperates with the first positioning post 412 to position and fix the first elastic piece 50 and the movable charging cylinder 41. In order to make the first elastic piece 50 and the movable charging cylinder 41 fixed more firmly, it is also possible to dispense between the notch 541 and the first positioning post 412. Of course, the notch 541 may also be 201012032 孑L that is not connected to the through hole 510. The notch 541 allows the first positioning post 412 to pass through the first elastic piece 50 to abut against the bottom surface 3272 of the recess 327, so that the frame 53 and the assembled outer frame 50 of the first elastic piece 50 are not in use. The inner frames 54 are respectively on different planes. The second elastic piece 60 has a square flat plate 61. The area of the flat plate 61 is larger than the area of the first elastic piece 50. The geometric center of the plate 61 defines a through hole 610 for the light to pass through the second bomb > 60. The slab 61 has a frame 63 surrounding the through hole 610 and away from the through hole 610, an inner frame 64 surrounding the through hole 610 and adjacent to the through hole 610, and four inner frames 63 and 64. The elastic portion 65 between. Of course, the number of the elastic portions 65 may also be two or three or more. The outer frame 63 also has four positioning holes 66 for use with the first positioning unit 326. The positioning hole 66 cooperates with the first positioning unit 326 to position and fix the second elastic piece 60 and the fixed body 32. In order to fix the second elastic piece 60 and the fixing body 32 more firmly, it is also possible to dispense between the positioning hole 66 and the first positioning unit 326. The inner frame 64 is provided with a notch 641 for use with the second positioning post 413. The opening direction of the notch 641 faces the through hole 610 and communicates with the through hole 610. The notch 641 cooperates with the second positioning post 413 to position and fix the second elastic piece 60 with the movable barrel 41. In order to make the second elastic piece 60 and the movable charging cylinder 41 fixed more firmly, it is also possible to dispense between the notch 641 and the second positioning post 413. Of course, the notch 641 may also be in contact with the through hole 610, the 201012032, the coil 42 is connected to the external circuit, so that a current flows in the coil 42, and the magnetic field generated by the current coil 42 in the fixed assembly 30 is generated. The medium is driven by the force to move the movable cylinder 41 along its central axis. Of course, the outer casing 20 can also be of other geometric shapes such as a circle, a triangle, a pentagon or a hexagon. Of course, only the first elastic piece 50 or only the second elastic piece 60 may be used. Please refer to Fig. 3, which shows a fixed assembly 30b according to a second embodiment of the present invention. The fixed assembly 30b has an annular fixed body 32b and a circular ring magnet 34b mounted on the fixed body 10b. The fixed body 32b is a cylindrical structure having a bottom plate 322b integrally formed with the side wall. The first end surface 35b having a circular shape and the second end surface 36b opposite to the first end surface 35b, the first end surface 35b is recessed toward the second end surface 36b to form a circular shape coaxial with the fixing body 32b. The magnetic portion 307b is configured to receive the magnet 34b, and the shape of the magnetic portion 307b is matched with the shape of the magnet 34b so that the magnet 34b is tightly received in the magnetic portion 307b. Three spaced-apart holes 309b are also formed in the inner wall of the body 32b to partially expose the magnet @34b. Of course, the shrapnel and the movable assembly should be changed to match the shape of the fixed assembly 30b. It can be understood that the three holes 309b can also be connected as one hole. Of course, the second accommodating cavity 307b may also be recessed from the inner wall of the fixing body 32b toward the outer wall thereof. Please refer to Fig. 4, which shows a fixed assembly 30c according to a third embodiment of the present invention. The fixed assembly 30c has a fixed body 32c and two circular arc-shaped magnets 34c mounted on the fixed body 32c. The fixed body 32c is a cylindrical structure having a bottom plate 322c integrally formed with the side wall 11 201012032. a first annular end face 35c and a second end face 36c opposite the first end face 35c, the first end face 35c having two arc-shaped first side wall end faces 305c, the second end face 36c having two a second side wall end surface 306c opposite to the two first side wall end surfaces 305c, the first side wall end surface 305c is recessed toward the opposite second side wall end surface 306c to form a circular arc-shaped magnetic portion 307c, the magnetic portion 307c is for accommodating the magnet 34c, and the shape of the magnetic portion 34c is matched with the shape of the magnet 34c, so that the magnet 34c is tightly received in the magnetic portion ❿34c, and the inner wall of the fixing body 32c is further opened. There are two spaced apart holes 309c to partially expose the magnet 34c. Of course, the shrapnel and the movable assembly should be correspondingly shaped to match the fixed assembly 30c. Of course, the magnetic portion 307c may be formed by recessing the inner wall of the fixed body 32c toward the outer wall thereof. Referring to FIG. 5, a fixed assembly 30d according to a fourth embodiment of the present invention has a fixed body 32d and four arc-shaped magnets 34d mounted on the fixed body 32d. The body 32d is a cylindrical structure having a bottom plate 322d formed with a side wall, having a rounded first end surface 35d and a second end surface 36d opposite to the first end surface 35d, the first end surface 35d A portion of the end portion of the four rounded corners facing the second end surface 36d at the four rounded corners is recessed to form four arc-shaped magnetic portions 307d for receiving the magnet 34d. The shape of the magnetic portion 307d is matched with the shape of the magnet 34d so that the magnet 34d is tightly received in the magnetic portion 307d, and the inner walls of the four rounded corners of the fixed body 32d are respectively opened. A hole 309d is provided to expose the magnet 34d portion 12 201012032. Of course, the shrapnel and the active set should be changed to match the shape of the fixed set • 30d. • Of course, the magnetic portion 307d may be formed by recessing the inner wall of the fixed body 32d toward the outer wall thereof. It is to be understood that the number of the magnets may be five, six or more, and is not limited to the embodiment, as long as the fixed body is provided with a magnetic portion having the same number as the number of magnets. Of course, the fixed body may also have other geometric structures such as a triangle, a quadrangle, a pentagon, and a hexagonal shape. Of course, if the fixed body is made of a material that the magnet can adsorb (for example, ferronickel, iron, or iron), then the magnet can be directly adsorbed on the inner wall of the fixed body. In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, which is not intended to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art and in the spirit of the present invention are intended to be included within the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view of a combination of a voice coil motor provided by a first embodiment of the present invention, which includes a fixed assembly. Fig. 2 is an exploded perspective view showing the voice coil motor of the first embodiment of the present invention. 3 is a schematic view of a fixed assembly provided by a second embodiment of the present invention. 4 is a schematic view of a fixed assembly provided by a third embodiment of the present invention. 13 201012032 FIG. 5 is a schematic diagram of a fixed assembly according to a fourth embodiment of the present invention. [Description of main components] • Voice coil motor 10 housing 20 fixed assembly 30, 30b, 30c, 30d movable assembly 40 first elastic 50 second shrapnel 60 top plate 22 first side plate 24 second side plate 26 through L 222, 3273, 510, 610 fixed bodies 32, 32b, 32c, 32d magnets 34, 34b, 34c, 34d side walls 321 bottom plate - first -容 室 322, 322b, 322c, 322d 323 magnetic portion 324, 307b, 307c, 307d rib 325 first positioning unit 326 inner surface 3221 outer surface 3222 groove 327 bottom surface 3272 14 201012032 second accommodating cavity 402 'active Cartridge 41 * First positioning post 412 - Positioning post 413 Coil 42 Plate 51, 61 Outer frame 53, 63 Inner frame 54, 64 Φ Elastic portion 55, 65 Dispensing hole 531 Notch 541, 641 Positioning hole 66 First end face 35b, 35c, 35d first end face 36b ' 36c, 36d hole 309b ' 309c ' 309d first side wall end face second side wall end face 305c 306c 15