j3649〇3 九、發明說明： 【發明所屬之技術領域】 本發明係有關於一種無心式小型馬達，且特別有關於 種於旋轉轴一端安裝有偏心分銅的振動產生用小型馬 達。 【先前技術】 近年來，在我們日常生活中，小型馬達正搭載於各種 電子裝置内，對於這些電子裝置，對應目的之馬達小型化、 輕量化及高出力化等的技術開發正如火如荼地進行著。 於無線通訊裝置之行動電話中，也搭載有前述小型馬 達，例如，於美術館、音樂廳等人員聚集的靜肅公共場合， 或者，商談或重要會議之座席間，行動電話突然之鈴聲會 造成周圍人員的極度困惑時，則使用將報知訊號以振動來 讓身體感知之振動產生用小型馬達。 上述振動產生用小型馬達（以下，簡稱「振動馬達」） 中女裝偏心之分銅於被驅動之旋轉軸，利用於轉子部旋 轉動作時，分銅等的偏心位置不均勻的離心力，使行動電 話機整體振動，隨著行動電話之普及，小型馬達之搭載率 即使用頻率也愈來愈高。 專利文獻1中記載的小型馬達，於圓筒狀馬達外殼一 端部形成有細小外徑之4鐵收納部，轴承與產生磁場的圓 筒狀磁鐵係被一齊收納於前述細小外徑磁鐵收納部之同一 面’且被固定。因此’相對於被插入圓筒狀磁鐵中心孔之 馬達外殼，就無須設置使圓筒狀磁鐵固定於既定位置之套 5 1364903 筒，成為能使小型馬達徑向尺寸減小，而使想型馬達更加 小型化之構造。 、加 又，於專利文獻2記載的小型馬達中，為了輕量化及 削減零件數量’而安裝有以塑膠取代金屬局部之塑谬模 體。前述塑賴體，係使支擇旋轉軸用之軸承部、使圓筒 狀磁鐵固定於馬達外殼既定位置上之套筒部及使塑谬模體 不會自馬達外殼脫落之保持部，以塑膠—體成形之構件。 【專利文獻1】日本特開2〇〇ι·〇〇9372號公報 【專利文獻2】日本特開2〇〇M367〇4號公報 【發明内容】 【發明所欲解決的課題】 專利文獻1中記載的小型馬達係相對於安裝在細小外 徑收納部前端位置之軸承，使圓筒狀磁鐵位於與前述轴承 同一保持面，於止推方向接觸相向地安裝之物件。因此， 當因為掉落衝擊等而圓筒狀磁鐵往止推方向移動，進而施 加強大力量時，自重很大的圓筒狀磁鐵會移動，與軸承接 觸而產生下押力，被押之軸承會自前述細小外徑收納部脫 離。 又，於專利文獻2記載的小型馬達中，即使當往軸承 側移動之力量施加於圓筒狀磁鐵時，與軸承一體成形之塑 膠模體，會藉由結合馬達外殼内外之保持部，而不自馬達 外殼脫落。可是，於塑膠模體，因為具備套筒部分，所以， 為了使馬達更加小型化，有必要減小圓筒狀磁鐵的外徑尺 寸。於此情形下’圓筒狀磁鐵表面磁束密度也會降低，而 丄364903 有使小型馬達輸出降低之問題，阻礙馬達之小型化。 本發明之目的係提供一種即使施加 側移動之強大力量於圓筒狀磁鐵時，也能防止 外殼嵌合部脫落，在不降低小型馬達輸出==達 就能使其小直徑小魏之小型馬I <㈣下’ 【用於解決課題的手段】 種題’本申請專利範圍第1項之發明係-二”士，定子部係包括：馬達外殼，一端部具開口， β 、另-端部具有比前述一端部開口直獲還要小的小直 軸承，被收納於馬達外殼之至少小直徑部側端 二處’轴支轉子部中心之旋熟；磁鐵，位於馬達外 成内，產生磁場；以及磁鐵收納部，藉由於馬達外殼之小 直徑部側端㈣近之⑽來雜固定料賴，其特徵在 於.包括於馬達外殼小直徑部之磁鐵收納部局部處，形成 ，旋轉轴直交之階梯，同時，於前述階梯處，具有藉由前 述磁鐵以旋轉軸止推方向來抵接，而使前述磁鐵相對於前 述軸承被保持於非接觸位置之磁鐵擋止面。 亦即，-種小型馬達，於馬達外殼内部具備支擇旋轉 軸之轴承及產生磁場的磁鐵，其特徵在於··於前述馬達外 殼之小直徑部侧端部附近，具備磁鐵收納部階梯，前述階 梯具有使前述顧g)定配置於妹承成非關狀態位置的 磁鐵撞止面。 又，本申請專利範圍第2項之發明係依申請專利範圍 第1項所述之小型馬達，其中，於磁鐵收納部徑向局部， 1364903 具有與磁鐵外形外周面相抵接，使磁鐵保持固定於馬達外 殼同心位置之磁鐵固定面。 又，本申請專利範圍第3項之發明係依申請專利範圍 第1或2項所述之小型馬達’其中，馬達外殼之磁鐵收納 部，係配置於與小直徑部側端部内徑之軸承收納部不同内 徑尺寸之位置。 又，本申請專利範圍第4項之發明係依申請專利範圍 第1〜3項所述之小型馬達，其中，於轉子部旋轉轴之一 端’安裝有偏心分銅。 【實施方式】 以下參照第1〜3圖說明本發明實施形態之構成。於 本實施形態中，小型馬達之一實施形態，以於旋轉軸具備 偏心分銅之無心式圓筒型振動馬達為例來說明。 第1圖係表示本發明小型馬達之剖面圖。如第i圖所 示，小型馬達1之本體，係以一端部開口，同時，另一端 係具有比前述_端部開p直徑還要小且經過階梯而開口 j小直徑部而形成約略圓筒形狀之馬達外殼3來構成。於 別述馬達外殼3中’如第2 ®所示之詳細，具備有收納第 1圖小型馬達1驅動機構大半之外殼本體部31，前述外殼 本體部31 1側，如圖所示，形成很大的開口狀態。又， 於前述外殼本體部31另一端侧，設有比前述外殼本體部 31直徑還要小很多之磁鐵收納部32，於前述磁鐵收齣部 32端部側’形成有成為階梯之磁鐵擋止面32b。又，於磁 鐵收納部32端部前端側，設有比前述磁鐵收納部32更小 1364903 直徑而開口的軸承收納部…如此—來，前述馬達外殼3 之小直徑部側端部，係設有如圖示形狀之徑向階梯。 而且，於前述磁鐵收納部32内徑側，如第3圖所示， =納有在馬達外殼3内部產生磁場的圓筒狀磁鐵5 一端。 前述圓筒狀磁鐵5-端’係與前述磁鐵擋止面32b抵接而 配置，圓筒狀磁鐵5藉由抵接無法移動超過軸承收納部33 方向。 又’同時，圓筒狀磁鐵5 -端外周面，係與作為前述 磁鐵收納部32内周面（參照第2或3圖）之磁鐵固定面 32a周緣相嵌合，以接著劑加以固著。藉此，圓筒狀磁鐵5 係固定於馬達外殼3側，以使圓筒狀磁鐵5巾^配置& 與馬達外殼3中心軸同一轴上之位置。 另外，相對於此，於前述轴承收納部33，位於輸出軸 月'J側之軸承6係被裝著，以使其與前述圓筒狀磁鐵5 一端 面為實質上非接觸狀態。如f i圖所示，於圓筒狀磁鐵5 中G孔内。p，貫穿有成為轉子部中心軸之旋轉轴2，藉由 前述前側軸承6及後側軸承7來旋轉自如地軸支轉子。後 側軸承7，係裝著在安裝於前述外殼本體部31開口側之蓋 體形狀端蓋4穿孔4a上。 於旋轉軸2局部，在與旋轉軸2同一軸上，使用由模 型化整流子11之塑膠成形材料所構成的線圈夾持器1〇, 於圓筒狀磁鐵5外周面與外殼本體31内周面間，中介有空 氣間隙，螺旋線圈8係配置於相向位置，構成杯狀轉子部。 另外，於前述端蓋4,裝著固定有使自外部來的電流 1364903 供給到整流子11的電刷9 端子來供給電流。 前述電刷9經過未圖示的供電 又1述小型馬達丨中’於馬達外殼3相之 出軸的旋轉軸2 —端，安裝右士括想+ ，J 仰 ^ *裝有由鎢等高比重燒結合金所形 厂圓柱狀偏心分鋼12，具有依照所謂振動馬達動作之 造。前述振動馬達，藉由以旋轉軸2旋轉驅動偏心分鋼 2’偏心位置會產生甩動力’馬達整體會振動。 接著，說明本實施形態中之作用效果。 例如’當使安裝有偏心分銅12之小型馬達i (振動 達）搭載於行動電關時，藉由選擇來訊模式，小型馬達 1會動作’偏心分銅12會高速旋轉而施加振動於行動電話 :用：用此作用，將體感振動之來訊訊息告知行動電話機 =者。X，同樣地，遊戲機控制器或手錶型鬧鐘等，者 :述小型馬達1時，也能發揮體感振動產生裝置之： 可疋’这些打動電話機或搭載有冑述振動馬達 類’當❹者以手部握持使㈣，也要考慮不小心掉落之 情形。例如，搭載有作為振動產生裝置之小型馬達 動電話機’當偶而以偏心分鋼12侧掉落地面時，強大 力會施加在止推方向上。此時，安裝有比重很大的偏心分 T 12的旋轉軸2處’當然會被施加很強大的止推方向力 置’-體的轉子部整體會強力下押與圓筒狀磁鐵$相接 的襯墊2〇 (參照第1圖）。因此，圓筒狀磁鐵5會被瞬間 施加往前侧軸承6侧止推方向上移動之力量。 3 1364903 可是，圓筒狀磁鐵5 —端面以磁鐵擋止面32b，往磁 鐵收納部32前端側，亦即，往軸承6側止推方向之移動被 限制，另外，軸承6係裝著於軸承收納部33，以使與圓筒 狀磁鐵5 —端面成非接觸狀態，所以，即使上述掉落事^ 發生時，能使發生在圓筒狀磁鐵5上之強大力量以磁鐵撞 止面32b來承受。因此，配置於軸承收納部33之軸承 即使承受因為.上述掉落所致之對馬達整體的衝擊力，也不 會自圓筒狀磁鐵5直接往止推方向施加強大力量。 同時，圓筒狀磁鐵5，係以其一端圓筒外周面與馬達 鲁 外殼3磁鐵固定面32a相嵌合，被接著固定於與馬達外殼 3中心軸同一軸上之位置，所以，無須於圓筒狀磁鐵$中 心孔配置固定用套筒。 如此一來，當使用本實施形態時，圓筒狀磁鐵5往止 推方向軸承6側之移動藉由磁鐵擋止面灿來限制，而且， 轴承6裝著於轴承I納部33，錢麻6與圓筒狀磁鐵5 -端面維持非接觸狀態，能防止藉由掉落衝擊等，轴承6 自轴承收納部33,部脫離原因之—的自圓筒狀磁鐵$ ，轴承6方向絲之力量。因此，能提供—種安裝有耐掉 落衝擊及可靠性咼的偏心分鋼的小型馬達。 又，小型馬達卜無須具備如先前的套筒，所以，能 設計出馬達外殼直徑比具備套筒之小型馬達還要小的物 件。又，因為無須具備如先前的套筒，所以當然 能削減’無彡請更小型馬達丨外徑尺寸，能㈣筒狀磁鐵 5内徑尺寸更加縮小而佔有切配置套筒之領域而增大 11 1364903 圓筒厚，以使表面磁束密度加大，能適用大體積的圓筒狀 磁鐵5 ’而有能設計出高出力小型馬達的效果。 【產業上可利用性】 主要係搭載於需要振動功能之包含：由行動電話開始 的f功能型行動電話、手錶型PHS、室内型小型無線通訊 機等的可攜式通訊設備、及攜帶型PDA等的各種資訊通訊 終端裝置、及伴隨有體感振動之遊戲機控制器或口袋式遊 戲機等電子玩具的電子裝置全體。 【發明效果】 · 如上所述，當使用本申請專利範圍第1項之發明時’ 例如，即使以掉落衝擊等而施加強大力量於具有自重之磁 鐵時，能使磁鐵之移動（自磁鐵側直接對端部軸承方向施 加力量）完全以磁鐵擋止面階梯來承受檔止，所以，能防 止軸承被磁鐵下押而往馬達外殼端部外側之止推方向脫 離亦即，相對於馬達外殼，能強固地固定磁鐵，而獲得 耐衝擊優良的小型馬達。 *又’當使用本申請專利範圍第2項之發明時，於馬S · 外殼同心位置上’配置圓筒狀磁鐵之固定構造，係使磁鐵 收納部於馬達外殼内徑面局部，亦即，於馬達外殼小直徑 部側圓筒部上形成為磁鐵固定面，藉此，能以圓筒狀磁鐵 二形外周部及馬達外殼之小直徑部側圓筒部内徑之磁麵 定面來嵌。固定。藉此’對於馬達外殼就無須另外具備 使磁鐵固定於中心位置之套筒等固定構件所以，能削減 零件數量。 12 1364903 、查隸又，當使用本申請專利範園第3項之發明時，前述馬 之磁鐵收納部’係被自&置於與小直徑部側端部内和 之軸承收納部不同内徑尺寸之位置，藉此，對於馬達夕卜^ 内徑，能磁鐵及軸承分別穩定而固定地配置。 又，當使用本申請專利範圍第4項之發明時，即使安 裝偏心分銅於旋轉轴之小型馬達為使用條件非常嚴苛之振 動馬達時，能使磁鐵強固而穩定地固定配置於馬達外殼， 於耐衝擊性中，也能發揮與上述相同之效果。 例如，當藉由掉落等衝擊，止推方向之強大力量施加在具 φ 備偏心分銅之旋轉軸時，形成於馬達外殼之磁鐵收納部磁 鐵擋止面，會下押安裝有偏心分銅的旋轉軸，即使在自止 推方向磁鐵侧往軸承方向上施加強大力量時，也能防止磁 鐵的移動及偏移。 【圖式簡單說明】 第1圖係表示本發明小型馬達之剖面圖。 第2圖係表示本發明小型馬達之馬達外殼局部剖面 第3圖係表不本發明小型馬達之馬達外殼、轴承及圓 商狀磁鐵配置之剖面圖。 【主要元件符號說明】 1 小型馬達 2 旋轉軸 3 馬達外殼 31 外殼本體部 32 磁鐵收納部 32a磁鐵固定面 32b磁鐵擋止面 33軸承收納部 13 1364903 4 端蓋. 8 螺旋線圈 40 接著劑 9 電刷部 5 圓筒狀磁鐵 10 線圈夾持器 6 轴承 11 整流子 7 軸承 12 偏心分銅 14[Technical Field] The present invention relates to a centerless small-sized motor, and particularly relates to a small-sized motor for vibration generation in which an eccentric copper is attached to one end of a rotating shaft. [Prior Art] In recent years, in our daily life, small motors are being installed in various electronic devices. For these electronic devices, the development of technologies such as miniaturization, weight reduction, and high output of motors for the purpose is in full swing. . In the mobile phone of the wireless communication device, the aforementioned small motor is also mounted, for example, in a public place where the art museum, a concert hall, and the like gather, or between the seats of a discussion or an important meeting, the sudden ringing of the mobile phone causes the surrounding When the person is extremely confused, a small motor that generates vibrations for the body to perceive the signal is used. In the above-mentioned small motor for vibration generation (hereinafter referred to as "vibration motor"), the eccentricity of the women's eccentricity is driven by the rotating shaft, and the centrifugal force of the eccentric position such as copper is uneven during the rotation of the rotor portion, so that the entire mobile phone is used. Vibration, with the popularity of mobile phones, the frequency of use of small motors is getting higher and higher. In the small motor described in Patent Document 1, a four-iron housing portion having a small outer diameter is formed at one end portion of the cylindrical motor casing, and the bearing and the cylindrical magnet that generates the magnetic field are housed in the small outer diameter magnet housing portion. The same side 'is fixed. Therefore, it is not necessary to provide a sleeve for fixing the cylindrical magnet to the predetermined position with respect to the motor casing inserted into the center hole of the cylindrical magnet, so that the radial size of the small motor can be reduced, and the motor can be driven. A more compact structure. Further, in the small-sized motor described in Patent Document 2, in order to reduce the weight and the number of parts to be replaced, a plastic mold in which a metal is partially replaced by a plastic is attached. The plastic body is a sleeve portion for supporting a rotating shaft, a sleeve portion for fixing the cylindrical magnet to a predetermined position of the motor casing, and a holding portion for preventing the plastic mold body from falling off from the motor casing, and plastic - Body shaped components. [Patent Document 1] Japanese Patent Laid-Open Publication No. JP-A No. Hei. In the small motor described above, the cylindrical magnet is placed on the same holding surface as the bearing with respect to the bearing attached to the tip end of the small outer diameter housing portion, and the object attached to the opposing direction is contacted in the thrust direction. Therefore, when the cylindrical magnet moves in the thrust direction due to the drop impact or the like, and a strong force is applied, the cylindrical magnet having a large self-weight moves, and the contact force is generated in contact with the bearing, and the beaded bearing is The detachment from the small outer diameter accommodating portion is performed. Further, in the small motor described in Patent Document 2, even when the force moving toward the bearing side is applied to the cylindrical magnet, the plastic molded body integrally formed with the bearing is combined with the holding portion inside and outside the motor casing, instead of Falling off the motor housing. However, since the plastic mold body has the sleeve portion, in order to make the motor more compact, it is necessary to reduce the outer diameter of the cylindrical magnet. In this case, the magnetic flux density on the surface of the cylindrical magnet is also lowered, and the 丄364903 has a problem of lowering the output of the small motor and hinders the miniaturization of the motor. SUMMARY OF THE INVENTION An object of the present invention is to provide a small-sized horse that can prevent a small-sized motor from falling off without lowering the output of the small motor by reducing the output of the small-sized motor even when the force of the application-side movement is strong on the cylindrical magnet. I < (4) 下 ' [Means for Solving the Problem] The subject of the invention is the second aspect of the invention, the stator system includes: a motor casing, one end having an opening, β, another end The portion has a small straight bearing that is smaller than the opening of the one end portion, and is housed in the center of at least the small diameter portion of the motor casing at the side of the shaft portion of the shaft portion; the magnet is located outside the motor and is generated. The magnetic field and the magnet accommodating portion are formed by the small-diameter side end (4) of the motor casing, and are included in the magnet housing portion of the small-diameter portion of the motor casing, and the rotating shaft is orthogonal. At the same time, at the step, the magnet is abutted against the magnet in the non-contact position with respect to the bearing by the magnet in the thrust direction of the rotating shaft. A small motor having a bearing for controlling a rotating shaft and a magnet for generating a magnetic field inside the motor casing, wherein a magnet housing portion step is provided in the vicinity of a small diameter portion side end portion of the motor casing, and the step has The invention is directed to the magnet-operated surface of the second embodiment of the invention, wherein the magnet is in the non-closed state. The accommodating portion has a radial portion, and 1364903 has a magnet fixing surface that abuts against the outer peripheral surface of the outer shape of the magnet to hold the magnet fixed to the concentric position of the motor casing. Further, the invention of the third aspect of the present application claims the first or second patent range. In the small motor described in the above, the magnet housing portion of the motor casing is disposed at a position different from the inner diameter of the bearing housing portion having the inner diameter of the end portion of the small diameter portion. Further, the invention of the fourth aspect of the present application is The small motor according to the first to third aspects of the patent application, wherein the eccentric copper is attached to one end of the rotor shaft. [Embodiment] The configuration of the embodiment of the present invention will be described with reference to the first to third embodiments. In the embodiment, an embodiment of the small motor is described as an example of a centerless cylindrical vibration motor having an eccentric copper split on a rotating shaft. A cross-sectional view showing the small motor of the present invention. As shown in Fig. i, the body of the small motor 1 is open at one end, and the other end has a smaller diameter than the aforementioned end portion and passes through the step. The motor casing 3 having a substantially cylindrical shape is formed in a small diameter portion of the opening j. The motor casing 3 is provided with a housing body that accommodates most of the driving mechanism of the small motor 1 of Fig. 1 in detail as shown in the second embodiment. In the portion 31 of the casing main body portion 31 1 as shown in the drawing, a large opening state is formed. Further, on the other end side of the casing main body portion 31, a magnet having a diameter much smaller than that of the casing main body portion 31 is provided. The accommodating portion 32 is formed with a stepped magnet stopper surface 32b on the end side of the magnet collecting portion 32. Further, on the distal end side of the end portion of the magnet housing portion 32, a bearing housing portion that is smaller than the diameter of the magnet housing portion 32 by 1364903 is provided, and the small diameter portion side end portion of the motor housing 3 is provided with The radial step of the shape shown. Further, on the inner diameter side of the magnet housing portion 32, as shown in Fig. 3, one end of the cylindrical magnet 5 that generates a magnetic field inside the motor casing 3 is included. The cylindrical magnet 5-end' is placed in contact with the magnet stopper surface 32b, and the cylindrical magnet 5 cannot move beyond the direction of the bearing housing portion 33 by the contact. At the same time, the outer peripheral surface of the cylindrical magnet 5 - end is fitted to the periphery of the magnet fixing surface 32a as the inner peripheral surface of the magnet housing portion 32 (see Fig. 2 or 3), and is fixed by an adhesive. Thereby, the cylindrical magnet 5 is fixed to the motor casing 3 side so that the cylindrical magnet 5 is placed on the same axis as the central axis of the motor casing 3. On the other hand, in the bearing housing portion 33, the bearing 6 located on the output shaft side J is attached so as to be substantially non-contact with the one end surface of the cylindrical magnet 5. As shown in the figure f i, it is inside the G hole in the cylindrical magnet 5. p, the rotating shaft 2 which is the central axis of the rotor portion is inserted, and the rotor is rotatably supported by the front side bearing 6 and the rear side bearing 7. The rear side bearing 7 is attached to a through hole 4a of a cover-shaped end cover 4 attached to the opening side of the casing main body portion 31. On the same axis as the rotating shaft 2, a coil holder 1A made of a plastic molding material of the modeled commutator 11 is used on the same axis as the rotating shaft 2, and the outer peripheral surface of the cylindrical magnet 5 and the inner circumference of the casing body 31 are provided. There is an air gap between the faces, and the spiral coils 8 are arranged at opposite positions to form a cup-shaped rotor portion. Further, a current is supplied to the end cover 4 to which a current 9364903 from the outside is supplied to the terminal 9 of the commutator 11 to supply a current. The brush 9 is supplied with a power supply (not shown) and a rotating shaft 2 at the exit shaft of the motor casing 3 in a small motor, and is mounted on the right side of the shaft of the motor casing 3, and is mounted on the right side of the rotor. The cylindrical eccentric splitter 12 of the specific gravity sintered alloy is formed in accordance with the so-called vibration motor operation. In the above-described vibration motor, the eccentric portion 2' eccentric position is rotationally driven by the rotary shaft 2 to generate a turbulent power, and the motor as a whole vibrates. Next, the effects of the present embodiment will be described. For example, when a small motor i (vibration) equipped with an eccentric copper split 12 is mounted on the mobile power switch, the small motor 1 operates by selecting the incoming mode. The eccentric copper 12 rotates at a high speed to apply vibration to the mobile phone: Use: Use this function to inform the mobile phone of the incoming signal of the somatosensory vibration. X, similarly, a game machine controller, a watch type alarm clock, etc., when the small motor 1 is described, the body vibration generating device can also be used: "These mobile phones or the vibration motor type" Hold the hand with the hand (4), and also consider the situation of accidentally falling. For example, when a small motorized telephone as a vibration generating device is mounted, the power is applied to the thrust direction when the eccentric branch 12 side is dropped on the ground. At this time, the rotating shaft 2 at which the eccentricity T 12 having a large specific gravity is mounted is of course 'strongly applied with a strong thrust direction force'. The entire rotor portion of the body is strongly pushed down to the cylindrical magnet $ Pad 2〇 (refer to Figure 1). Therefore, the cylindrical magnet 5 is instantaneously applied with a force that moves in the thrust direction toward the front side bearing 6 side. 3 1364903 However, the end surface of the cylindrical magnet 5 is blocked by the magnet stopper surface 32b toward the distal end side of the magnet housing portion 32, that is, the movement toward the bearing 6 side is restricted, and the bearing 6 is attached to the bearing. Since the accommodating portion 33 is in a non-contact state with the end surface of the cylindrical magnet 5, even when the above-described falling event occurs, the strong force generated on the cylindrical magnet 5 can be caused by the magnet urging surface 32b. bear. Therefore, the bearing disposed in the bearing housing portion 33 does not exert a strong force directly from the cylindrical magnet 5 in the thrust direction even if it receives the impact force on the entire motor due to the above-described drop. At the same time, the cylindrical magnet 5 is fitted to the motor-fixed surface 32a of the motor-lub case 3 at the outer peripheral surface of the one end cylinder, and is then fixed to the same axis as the central axis of the motor casing 3, so that it is not required to be round. The cylindrical magnet is provided with a fixing sleeve for the center hole. As described above, when the present embodiment is used, the movement of the cylindrical magnet 5 to the thrust bearing 6 side is restricted by the magnet stopper surface, and the bearing 6 is attached to the bearing I portion 33. 6, the cylindrical magnet 5 - the end surface is maintained in a non-contact state, and it is possible to prevent the bearing 6 from being separated from the bearing accommodating portion 33 by the drop impact or the like, and the force of the wire from the cylindrical magnet $ and the bearing 6 . Therefore, it is possible to provide a small motor equipped with an eccentric steel which is resistant to drop impact and reliability. Moreover, the small motorb does not need to have a sleeve as in the prior art, so that it is possible to design an object having a smaller motor casing diameter than a small motor having a sleeve. Moreover, since it is not necessary to have a sleeve as in the prior art, it is of course possible to reduce the size of the outer diameter of the smaller motor, and the size of the inner diameter of the cylindrical magnet 5 can be further reduced and the area of the cut-and-displacement sleeve is increased. 1364903 The thickness of the cylinder is such that the surface magnetic flux density is increased, and the large-volume cylindrical magnet 5' can be applied, and the effect of the high-power small motor can be designed. [Industrial Applicability] Mainly installed in a portable communication device such as an f-function mobile phone, a watch-type PHS, an indoor small-sized wireless communication device, and a portable PDA that are required to be activated by a mobile phone. All kinds of electronic communication devices such as information communication terminal devices and electronic game devices such as game machine controllers and pocket game machines with somatosensory vibrations. [Effect of the Invention] As described above, when the invention of the first aspect of the present application is used, 'for example, even when a strong force is applied to a magnet having a self-weight by a drop impact or the like, the magnet can be moved (from the magnet side) Directly applying force to the end bearing direction) completely stops the stop by the magnet stop surface step, so that the bearing can be prevented from being pushed away by the magnet and released to the outside of the end of the motor casing, that is, relative to the motor casing, The magnet can be firmly fixed to obtain a small motor with excellent impact resistance. *When the invention of the second aspect of the present application is used, the fixing structure of the cylindrical magnet is disposed at the concentric position of the outer casing of the horse S, so that the magnet housing portion is partially on the inner diameter surface of the motor casing, that is, The cylindrical portion of the small diameter portion of the motor casing is formed as a magnet fixing surface, whereby the cylindrical outer surface of the cylindrical magnet and the magnetic surface of the inner diameter of the small diameter portion of the motor casing can be fixed. fixed. Therefore, it is not necessary to separately provide a fixing member such as a sleeve for fixing the magnet to the center position of the motor casing, so that the number of parts can be reduced. 12 1364903, Cha Li, when using the invention of the third paragraph of the patent application, the magnet storage portion of the horse is placed between the inner diameter of the small diameter portion and the bearing housing portion. With respect to the position of the size, the magnet and the bearing can be stably and fixedly arranged for the inner diameter of the motor. Further, when the invention of the fourth aspect of the present application is used, even when a small motor in which an eccentric copper is mounted on a rotating shaft is used as a vibration motor having extremely severe conditions, the magnet can be firmly and stably fixed to the motor casing. In the impact resistance, the same effects as described above can be exerted. For example, when a strong force in the thrust direction is applied to a rotating shaft having a eccentric copper split by a drop or the like, the magnet receiving portion of the magnet housing portion of the motor casing is formed, and the rotation of the eccentric copper is mounted. The shaft can prevent the movement and displacement of the magnet even when a strong force is applied to the direction of the bearing from the magnet side in the thrust direction. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing a small motor of the present invention. Fig. 2 is a partial cross-sectional view showing the motor casing of the small motor of the present invention. Fig. 3 is a cross-sectional view showing the arrangement of the motor casing, the bearing and the circular magnet of the small motor of the present invention. [Description of main component symbols] 1 Small motor 2 Rotary shaft 3 Motor housing 31 Housing main body portion 32 Magnet housing portion 32a Magnet fixing surface 32b Magnet stopper surface 33 Bearing housing portion 13 1364903 4 End cap. 8 Spiral coil 40 Adhesive 9 Electric Brush part 5 cylindrical magnet 10 coil holder 6 bearing 11 commutator 7 bearing 12 eccentric copper 14