1253517 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種相機鏡頭之驅動機構，特別是有 關於一種可自動對焦鏡頭之驅動機構。 ， 【先前技術】 隨著攝影工藝的進步，現代的相機設備多半都具有對 焦的功能，以使位於不同距離處 、 向士、綠^ ^ 物體都旎清晰地在相機 内成像。而所谓的對焦便是調整鏡頭的 内的光線能夠聚焦在相機内最正確的位置上， 目 的影像才能被清楚地紀錄在相機之巾。 &所拍攝 最早以前的傳統相機是採科動對㈣方式，也就是 方式調整鏡頭的位置，再用肉眼來判斷鏡頭的 否。雖然用手動的對焦方式較容易使攝影者得 滿忍的對焦結果，但對非專業的相機使用者來說相對的 也增加了使用上的困難，因此，便有了全自動相機的問世。 全自動相機可在攝影者在拍攝影像時先自動地將焦距對 好’然後再將影像紀錄起來’如此不僅降低了相機的使用 難度自動對焦的方式也減少了對焦失敗的機會。 簡單的自動對焦方法，通常相機内會具有一處理器及 、鏡：驅動裝置。處理器會擷取光線訊號並透過一些演算 _ ^出鏡碩的最佳位置，然後再經由鏡頭驅動裝置將鏡 多動到適田的位置。驅動裝置一般可利用一般的旋轉式 =達來達到移動鏡頭的目的’但是由於鏡頭是採用直線的 在覆式運動方式，所以在旋轉式馬達及鏡頭之間必須有一 1253517 能夠將旋轉式運動轉換為直線式運動的傳動機構。該傳動 機構一般是由凸輪套筒及齒輪裝置所組成，體積龐大且設 °十困難’在手機等隨身攜帶產品上有應用的困難。 再者，照著電子產品的整合趨勢來看，相機已經不再 是單純的相機而已，而是會與行動電話或個人數位助理 (Personal Digital Assistant，pDA)等設備結合的可攜式裝 置’因此在設計上小型化也是—項重要的考量。以傳統的 鏡頭傳動方式來看，旋轉式馬達不僅已佔據了相#大的體 積並且遇要考置傳動機構所佔的空間。所以此種相機模 組之小型化實有其極限。 綜觀以上所述，隨著對焦精確度及產品小型化等要求的 提高’實須-種更精確、更易於㈣、體積更小之鏡頭驅 動機構。 【發明内容】 因此本發明的目的就是在提供一種易於控制的鏡頭驅 動機構。 口此本U的另—目的就是在提供—種定位精確度高 的鏡頭驅動機構。 因此本發明的又一目的就是在提供一種小體積的鏡頭 驅動機構。 因此本I明的再一目的就是在提供-種成本低廉的鏡 頭驅動機構。 為達到本兔明之上述目的，此種鏡頭驅動機構由一第 圓筒磁t生物質（為一永磁體），一導體、線圈、一彈性物 1253517 質二一第二圓筒以及一鏡頭裝置所組成。第一圓筒及第二 圓简白為二心狀，且兩端都各具有一開口，其中第一圓筒 的大J足以包圍住第一圓筒。第二圓筒的内部固定著鏡頭 裝置，導體線圈則被環繞且固定於第二圓筒的外表面上， 第二圓筒並具有一環狀凸緣自第二圓筒之外表面垂直延伸 而出，此環狀凸緣被用以承載彈性物質，使彈性物質能夠 圍繞在第二圓筒的周圍。磁性物質被安裝在第一圓筒的内 表面上，當第二圓筒進入第一圓筒的内部時，導體 少會有-部分與磁性物質相對著，也就說導體線圈隨時都 =有至少—部分處於磁性物質的磁力線範圍中，且磁性物 質的磁力線會垂直穿越過導體線圈。 當在導體線圈上施加電流後，由於電流的方向和磁性 物質所發出的磁力線方向是互相垂直的，因此會產生一作 用力帶動第二圓筒前進，且電流的大小與作用力的大小是 成正比。在第二圓筒前進的同時，介於環狀凸緣與磁性物 質之間的彈性物質，會因為環狀凸緣與磁性物質的逐漸接 近而受到擠壓，而對第二圓筒產生一反作用力。如此，口 要利用控制電流大小來調整作用力與反作用力之間的平 衡’便可決定第二圓筒與位於其内部之鏡頭裝置的位置。 也因此只要能夠對雷泠士 ,> ”L大小進订南精細度的微調，則鏡頭 的定位精確度也能夠提高。 【實施方式】 流及磁力線交互作用 利用此種方式可在不 本赉明的基本構想在於利用電 所產生的作用力來控制鏡頭的位置， 1253517 需外加傳動機構的情況下直接帶動鏡頭進行直線式的往覆 運動二並且能夠以簡單的控制方式達到高定位精準度。 第1A圖為符合本發明之一實施例之爆炸圖。由圖中 可看出鏡頭驅動機構1〇〇中的一些主要元件，其中有鏡頭 套筒1〇2、鏡頭108、導體線圈11〇、彈簧112、兩磁鐵ιΐ4: 兩磁鐵U4之間的導磁體116以及包覆住整個驅 機構套筒118。 其中鏡頭套筒102的内部能夠容納並固定住鏡頭 ⑽’鏡頭套筒102的外部表面上則環繞並固定著導體線圈 no。在本實施例中是利用環繞在鏡頭套筒102外表面上的 環狀:冓槽1〇6來固定住導體線圈11〇，亦即，將導體線圈 110壞繞在環狀溝槽106之中。另外，鏡頭套筒1〇2之外表 面延伸出一與外表面垂直之凸緣104。當將彈簧112環套在 鏡頭套筒102周圍時，鏡頭套筒1〇2的凸緣1〇4與彈簧112 便會互相接觸，以承載住彈簧112使鏡頭套筒ι〇2不致於 穿透彈簧112而出。 機構套筒118能夠包覆住上述之所有元件，即内部包 套住鏡頭108,外部纏繞有導體線圈11〇並為彈簧112所環 繞的鏡頭套筒102。兩環狀的磁鐵114及夾在兩磁鐵114 之間的導磁體116皆被固定在機構套筒118的内表面上。 第1B圖繪示了將第1 a圖中的各個元件組立後的截面 圖，即整個鏡頭驅動機構10〇之截面圖，可更清楚地看出 各個70件之間的相對位置。鏡頭套筒102將鏡頭1〇8包套 之來一體線圈11 〇纏繞在鏡頭套筒102外表面上的環狀 溝槽106之中，彈簧112環繞著鏡頭套筒1〇2，彈簧112 1253517 之一端並與鏡頭套筒l〇2外表面上的凸緣l〇4相接，最後， 内表面配置有兩磁鐵114及兩磁鐵間之導磁體116的機構 套请118再將鏡頭套筒1 〇2整個地包套住。其中，磁鐵11 & 及導磁體116的位置必須是面對著導體線圈11〇，也就是說 由磁鐵114及導磁體所發射出的磁力線必須要能夠切割過 導體線圈110。另外，以第1B圖的方向來看，磁鐵114的 位置必須要在鏡頭套筒102帶動著彈簧112向右移動時， 能夠與彈簧112接相接觸，用以擠壓位於凸緣1〇4與磁鐵 114之間的彈簧112。 第2A圖表示了符合本發明的鏡頭位置控制方法，由 於鏡頭驅動機構1 〇〇中的機構套筒丨丨8的位置是固定不動 的，因此在第2A圖及第2B圖中皆未將第1B圖中的機構 套筒118繪示出來。首先看到兩磁鐵114與導磁體116接 合的表面皆為N磁極，而另一未與導磁體116接合的表面 則皆為S磁極。由磁性物質的特性可知，磁力線會由磁性 物質的N磁極射往S磁極，因此第2A圖中的磁鐵114所 射出的磁力線當申，會有部分經由導磁體116引導，並射 向並切割過導體線圈110的磁力線12〇。 根據勞倫斯定律（LorentzLaw)可知，若此時於導體線 圈no上施加電流，則會在導體線圈11〇上產生一朝著方 向122的作用力f，其大小為：BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving mechanism for a camera lens, and more particularly to a driving mechanism for an autofocus lens. [Prior Art] With the advancement of the photographic process, most modern camera devices have the function of focusing so that the objects at different distances, toward the singular and green objects are clearly imaged in the camera. The so-called focus is to adjust the light inside the lens to focus on the most accurate position in the camera, the target image can be clearly recorded in the camera towel. & photographed The earliest previous traditional camera was the method of picking the pair (four), that is, the way to adjust the position of the lens, and then use the naked eye to judge whether the lens is not. Although the manual focusing method makes it easier for the photographer to achieve the result of the full-bearing focus, it is relatively difficult for the non-professional camera user to use, so that a fully automatic camera is available. The fully automatic camera automatically corrects the focus when the photographer is shooting the image and then records the image. This not only reduces the camera's use. The difficulty of autofocusing also reduces the chance of focus failure. A simple autofocus method usually has a processor and mirror: drive in the camera. The processor will capture the light signal and pass through some calculations to get the best position, and then move the mirror to the appropriate position via the lens driver. The driving device can generally use the general rotary type = to achieve the purpose of moving the lens'. However, since the lens is in a linear motion, there must be a 1253517 between the rotary motor and the lens to convert the rotary motion into Linear motion transmission mechanism. The transmission mechanism is generally composed of a cam sleeve and a gear device, and is bulky and difficult to set. It is difficult to apply on a portable product such as a mobile phone. Moreover, according to the integration trend of electronic products, the camera is no longer a simple camera, but a portable device that will be combined with a mobile phone or a personal digital assistant (pDA). Miniaturization in design is also an important consideration. In the conventional lens transmission mode, the rotary motor not only occupies a large volume of the phase, but also takes up space occupied by the transmission mechanism. Therefore, the miniaturization of such a camera module has its limits. Looking at the above, with the increase in focus accuracy and product miniaturization, it is necessary to have a more precise and easier (four), smaller lens drive mechanism. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an easy-to-control lens driving mechanism. The other purpose of this U is to provide a lens drive mechanism with high positioning accuracy. It is therefore a further object of the present invention to provide a lens drive mechanism of a small size. Therefore, a further object of the present invention is to provide a low cost lens driving mechanism. In order to achieve the above object of the present invention, the lens driving mechanism consists of a cylindrical magnetic t-biomass (which is a permanent magnet), a conductor, a coil, an elastic 1253517, a second cylinder, and a lens device. composition. The first cylinder and the second cylinder are simply two-core and each has an opening at each end, wherein the large J of the first cylinder is sufficient to enclose the first cylinder. A lens device is fixed inside the second cylinder, and the conductor coil is surrounded and fixed on the outer surface of the second cylinder, and the second cylinder has an annular flange extending perpendicularly from the outer surface of the second cylinder. Out, the annular flange is used to carry an elastic material so that the elastic material can surround the second cylinder. The magnetic substance is mounted on the inner surface of the first cylinder. When the second cylinder enters the interior of the first cylinder, the conductor has less - part opposite to the magnetic substance, that is, the conductor coil is always at least = at least - Part of the magnetic field line of the magnetic substance, and the magnetic field lines of the magnetic substance pass vertically through the conductor coil. When a current is applied to the conductor coil, since the direction of the current and the direction of the magnetic flux emitted by the magnetic substance are perpendicular to each other, a force is generated to drive the second cylinder forward, and the magnitude of the current and the magnitude of the force are Just proportional. While the second cylinder is advancing, the elastic material interposed between the annular flange and the magnetic substance is squeezed due to the gradual proximity of the annular flange to the magnetic substance, and a reaction to the second cylinder force. Thus, the port uses the magnitude of the control current to adjust the balance between the force and the reaction force to determine the position of the second cylinder and the lens device located therein. Therefore, as long as the fine adjustment of the south fineness can be made to the Thunder, > L size, the positioning accuracy of the lens can also be improved. [Embodiment] Flow and magnetic line interaction can be used in this way. The basic idea of Ming is to use the force generated by electricity to control the position of the lens. 1253517 requires a direct transmission mechanism to directly drive the lens for linear motion and achieve high positioning accuracy with simple control. Fig. 1A is an exploded view of an embodiment of the present invention. It can be seen from the figure that some of the main components of the lens driving mechanism 1〇〇 include a lens sleeve 1〇2, a lens 108, and a conductor coil 11〇. The spring 112, the two magnets ι4: the magnetizer 116 between the two magnets U4 and the entire drive mechanism sleeve 118. The inside of the lens sleeve 102 can accommodate and fix the lens (10) on the outer surface of the lens sleeve 102. Then, the conductor coil no is surrounded and fixed. In this embodiment, the annular coil: the groove 1〇6 surrounding the outer surface of the lens sleeve 102 is used to fix the conductor coil 11〇. That is, the conductor coil 110 is broken in the annular groove 106. In addition, the outer surface of the lens barrel 1〇2 extends a flange 104 perpendicular to the outer surface. When the spring 112 is looped over the lens sleeve When the periphery of 102, the flanges 1〇4 of the lens sleeve 1〇2 and the spring 112 are in contact with each other to carry the spring 112 so that the lens sleeve ι 2 does not penetrate the spring 112. The mechanism sleeve 118 can Covering all of the above components, that is, the inner sleeve is wrapped around the lens 108, and the outer surface of the lens coil 102 surrounded by the conductor coil 11 is surrounded by the spring 112. The two annular magnets 114 are sandwiched between the two magnets 114. The guiding magnets 116 are all fixed on the inner surface of the mechanism sleeve 118. Fig. 1B is a cross-sectional view showing the components of the first embodiment, i.e., the entire lens driving mechanism 10, which may be further The relative position between the 70 pieces is clearly seen. The lens sleeve 102 wraps the lens 1〇8 around the integral coil 11 and wraps around the annular groove 106 on the outer surface of the lens sleeve 102, the spring 112 Surrounding the lens sleeve 1〇2, one end of the spring 112 1253517 and the lens sleeve l〇2 The flanges 104 on the surface are connected to each other. Finally, the mechanism sleeve 118 having the inner surface of the two magnets 114 and the magnets 116 between the two magnets is further wrapped around the lens sleeve 1 〇 2 . 11 & and the position of the magnetizer 116 must face the conductor coil 11 〇, that is, the magnetic lines of force emitted by the magnet 114 and the magnetizer must be able to cut through the conductor coil 110. In addition, in the direction of Figure 1B In view, the position of the magnet 114 must be in contact with the spring 112 as the lens sleeve 102 moves the spring 112 to the right to squeeze the spring 112 between the flange 1〇4 and the magnet 114. Fig. 2A shows a lens position control method according to the present invention. Since the position of the mechanism sleeve 8 in the lens driving mechanism 1 is fixed, it is not in the 2A and 2B drawings. The mechanism sleeve 118 in Figure 1B is illustrated. First, it is seen that the surfaces of the two magnets 114 that are coupled to the magnets 116 are all N magnetic poles, and the other surface that is not engaged with the magnetizers 116 is an S magnetic pole. It can be seen from the characteristics of the magnetic substance that the magnetic lines of force are emitted from the N magnetic pole of the magnetic substance to the S magnetic pole. Therefore, the magnetic lines of force emitted by the magnet 114 in Fig. 2A are partially guided by the magnetizer 116 and are directed and cut. The magnetic field line 12 of the conductor coil 110 is 〇. According to Lawrence Law (Lorentz Law), if a current is applied to the conductor coil no, a force f is generated on the conductor coil 11A in the direction 122, the magnitude of which is:
F = rIL X B 其中， 7 1253517 I為導體線圈11 〇上的電流強度； L為導體線圈11 〇之總長度； Β為磁通密度；以及 r為導體線圈110在磁場中的長度與其總長 度的比例。 由本實施例的機構中可看出，導體線圈丨丨〇的總長度L 為一固定值，從磁鐵114所產生，通過導體線圈丨丨〇的磁 力線120之磁通岔度B也為一固定值，而因為磁鐵114環 繞著導體線圈110,導體線圈11〇整體皆為磁力線12〇所切 割，所以可將比值r視為1。在這種情況下，作用力F的大 小只與導體線圈110上所留過的電流強度j有關，兩者並 成正比關係，也就是說流經導體線圈11〇的電流越大，則 導體圈上朝方向122的作用力越強。 因為導體線圈110是固定在鏡頭套筒102上的，因此 當導體線圈U0為朝著方向122的作用力所帶動時，鏡頭 套筒102及固定於其中之鏡頭1〇8也會連帶著往方向122 移動。隨著鏡頭套筒102往方向122的移動，彈簣ιΐ2會 因凸緣104與磁鐵114相對位置的縮小而遭擠壓，因此對 鏡頭套筒102產生一與方肖122相反的反作用力，此反作 :力會隨著彈f 112受擠壓程度的增加而增加，也就是說 兄項套疴102想要有較大的移動量，就必須要 圈110上加入較強大的電流，則在方向122上就會產生且較 大的作用力以抵抗來自彈篑112的反作用力。當作用力與 反作用力達到平衡時，鏡頭套筒1G2與鏡頭⑽便會停止 在固疋位置上。由上述原理可知，只要將流經導體線圈 1253517 m的電流大小加以控制，便可將鏡頭套筒⑽移動 要的位置。當中止了流經導體線圈11〇的電流後 : 筒102會因彈菁112的反作用力而回到初始位置。 在第2A圖所表示的實施财，是利用兩環形磁鐵114 以及-能夠提高磁通密度的環形導磁冑ιΐ6所組成。 2B圖中提供了另-種僅以—環狀磁鐵來實現本發明的實施 例。第2B圖中所表示的結構與圖中所表示的結構是 相似的，僅有磁鐵的部份改成了僅有—個環狀磁鐵2〇2，盆 中磁鐵2G2與導體線圈2G4相對的表面具有n磁極，而背 對導體線圈204的表面則具有s磁極。由此可知磁鐵2〇2 所發射出的磁力線206 —樣是往導體線目2〇4的方向射 去，並同樣地切割過導體線圈2〇4，所以在導體線圈2〇4 上通以電流後一樣會產生一個朝著方向2〇8的作用力，而 其原理及控制方式皆與第2A圖所示之實施例相同。 要加以說明的是，上述說明中所提到的磁鐵泛指任何 可提供固定磁場的磁性物質，如一般常見的磁鐵或是電磁 鐵，在上述的貫施例中是利用了具有高殘留磁通密度及矯 頑磁力特性的鈥鐵綳（Nd-Fe-B)磁鐵。而導磁體則泛指為任 何能夠將磁力線匯集為高磁通密度之均勻磁場的導磁材 料。彈簧則能夠為任何具有回復力的彈性物質所取代，如 平板狀的簧片或膠塊等。 由以上有關鏡頭驅動機構的說明中可知，只要在導體線 圈中施以適當大小的電流，即可將鏡頭移至所要求的位 置。因此在一應用此種鏡頭驅動機構的可變焦攝影裝置 中’只需加入一變焦控制電路，便可輕易地移動鏡頭以達 1253517 到變焦的目的。其中此變焦控制電路能夠視實際的情況計 算並輸出適當大小的電流，所以可以使用如處理器一般的 元件來加以實現。 雖然本發明已以一較佳實施例揭露如上，然其並非用 以限定本發明，任何熟習此技藝者,在不脫離本發明之精 =範_，當可作各種之更動與潤飾，因此本發明之: 護範圍當視後附之申請專利範圍所界定者為準。 ” 【圖式簡單說明】 心為讓本發明之上述和其他目的、特徵、優點與實施例 月匕更明顯易懂，所附圖式之詳細說明如下·· =1A圖為符合本發明實施例之鏡頭驅動機構爆炸圖。 第1B圖為符合本發明實施例之鏡頭驅動機構截面圖。 第2A Kg符合本發明實施例之鏡頭驅動機構動作示 〇 第 ^ B圖為符合本發明實施例之鏡頭驅動機構動作示 【主要元件符號說明】 1〇2 :鏡頭套筒 106 :溝槽 11〇 :導體線圈 114 :磁鐵 11 8 :機構套筒 lG〇 _·鏡頭驅動機構 104 :凸緣 1Q8:鏡頭 112 :彈簧 116:導磁體 1253517 120 : 202 ： 206 磁力線 122 :方向 磁鐵 204 :導體線圈 磁力線 208 :方向F = rIL XB where 7 1253517 I is the current intensity on the conductor coil 11 ;; L is the total length of the conductor coil 11 ;; Β is the magnetic flux density; and r is the length of the conductor coil 110 in the magnetic field and its total length proportion. As can be seen from the mechanism of the present embodiment, the total length L of the conductor coil turns is a fixed value, and the magnetic flux twist B of the magnetic field line 120 passing through the conductor coil turns is also a fixed value. Since the magnet 114 surrounds the conductor coil 110 and the conductor coil 11 is entirely cut by the magnetic flux 12 ,, the ratio r can be regarded as 1. In this case, the magnitude of the force F is only related to the intensity j of the current remaining on the conductor coil 110, and the two are proportional to each other, that is, the larger the current flowing through the conductor coil 11 ,, the conductor ring The force in the upward direction 122 is stronger. Since the conductor coil 110 is fixed to the lens sleeve 102, when the conductor coil U0 is driven by the force directed toward the direction 122, the lens sleeve 102 and the lens 1〇8 fixed therein are also brought in the forward direction. 122 Move. As the lens sleeve 102 moves in the direction 122, the magazine ΐ 2 is squeezed by the relative position of the flange 104 and the magnet 114, thereby generating a reaction force against the lens sleeve 102 opposite to the square chord 122. Inverse: the force will increase with the increase of the degree of compression of the bomb f 112, that is to say, if the brother set 102 wants to have a large amount of movement, it is necessary to add a strong current to the circle 110, then A large force is generated in the direction 122 to resist the reaction force from the magazine 112. When the force and the reaction force are balanced, the lens sleeve 1G2 and the lens (10) will stop at the solid position. According to the above principle, the lens sleeve (10) can be moved to a desired position by controlling the magnitude of the current flowing through the conductor coil 1253517 m. When the current flowing through the conductor coil 11 is suspended: the cylinder 102 returns to the initial position due to the reaction force of the elastomer 112. The implementation shown in Fig. 2A is composed of two ring magnets 114 and a ring magnetism 胄ι6 which can increase the magnetic flux density. Another embodiment of the invention is provided with only a ring magnet in Figure 2B. The structure shown in Fig. 2B is similar to the structure shown in the figure, except that the magnet portion is changed to only the ring magnet 2〇2, and the surface of the magnet 2G2 in the basin is opposite to the conductor coil 2G4. There are n magnetic poles, and the surface facing away from the conductor coil 204 has an s magnetic pole. Therefore, it can be seen that the magnetic lines 206 emitted by the magnet 2〇2 are emitted in the direction of the conductor line 2〇4, and the conductor coil 2〇4 is cut in the same manner, so that a current is applied to the conductor coil 2〇4. The same will produce a force in the direction of 2〇8, and the principle and control method are the same as the embodiment shown in FIG. 2A. It should be noted that the magnet mentioned in the above description generally refers to any magnetic substance that can provide a fixed magnetic field, such as a common magnet or an electromagnet, and in the above embodiments, a high residual magnetic flux is utilized. Nd-Fe-B magnets with density and coercive properties. The magnetizer is generally referred to as any magnetic material capable of collecting magnetic lines of force into a uniform magnetic field of high magnetic flux density. The spring can be replaced by any elastic material with a restoring force, such as a flat reed or a rubber block. As can be seen from the above description of the lens driving mechanism, the lens can be moved to the desired position by applying an appropriate current to the conductor coil. Therefore, in a zoom lens apparatus using such a lens driving mechanism, it is easy to move the lens up to 1253517 to zoom by simply adding a zoom control circuit. The zoom control circuit can calculate and output an appropriate amount of current depending on the actual situation, so that it can be implemented using a processor-like component. Although the present invention has been disclosed in a preferred embodiment as above, it is not intended to limit the present invention, and any person skilled in the art can make various changes and retouching without departing from the essence of the present invention. Inventive: The scope of protection is subject to the definition of the scope of the patent application. BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, advantages and embodiments of the present invention will become more apparent and obvious. The detailed description of the drawings is as follows: =1A is in accordance with an embodiment of the present invention. FIG. 1B is a cross-sectional view of a lens driving mechanism according to an embodiment of the present invention. 2A Kg is a lens driving mechanism according to an embodiment of the present invention. FIG. 2B is a lens according to an embodiment of the present invention. Actuator action indication [Main component symbol description] 1〇2: Lens sleeve 106: Groove 11〇: Conductor coil 114: Magnet 11 8 : Mechanism sleeve lG〇_·Lens drive mechanism 104: Flange 1Q8: Lens 112 : Spring 116: Magnetizer 1253517 120 : 202 : 206 Magnetic field line 122 : Directional magnet 204 : Conductor coil Magnetic field line 208 : Direction
1111