200827907 九、發明說明： 【發明所屬之技術領域】 本發明涉及一種鏡頭模組，尤其涉及一種多段式變焦 之鏡頭模組。 【先前技術】 隨著攝像技術之發展，相機模組在各種用途的攝像裝 置中得到廣泛應用，相機模組與各種攜帶型電子裝置如手 機、攝像機、電腦等的結合，更是得到衆多消費者之青睞。 為拍攝不同放大倍數之圖像，相機通常要求具有變焦 功能，實現相機的變焦功能有兩種方法：光學變焦和數位 變焦。 光學變焦是依靠光學鏡頭本身的結構來實現，即通過 驅動裝置驅動鏡頭中的鏡片移動或手動旋轉鏡筒使得鏡片 移動以使被拍攝的景物放大或縮小，變焦倍數越大的相機 其鏡頭體積相對較大，因此其内部的鏡片或影像感光器移 動空間較大。 手機限於體積之原因，機身内部的有限空間限制了鏡 片和影像感光器的移動，因此在手機中實現光學變焦較為 困難，因而手機大都是通過定焦設計、數位變焦來實現圖 像大小之改變。所謂數位變焦實際上是一種晝面的電子放 大，影像感光器上的圖片像素通過相機内部處理器進行放 大，從而達到放大圖像之目的。數位變焦與光學變焦不同， 數位變焦後拍攝的景物雖然放大了，但是景物的清晰度會 下降。 200827907 先前技術中，相機也有通過磁力驅動鏡頭移動變焦來 實現小型化的要求，如美國專利申請第2004/0130808號， . 其揭示一種鏡頭驅動裝置。該鏡頭驅動裝置包括鏡頭的移 動件、安裝在鏡頭週邊的環形驅動磁鐵、纏繞著驅動線圈 的固定體、鏡頭光轴至少一端設有磁性片，該移動體可在 光軸方向上第一保持位置和第二保持位置之間移動。當驅 動線圈通電時，通過驅動線圈與驅動磁鐵之間的磁力作用 使移動體可從第一保持位置移動至第二保持位置，當停止 對驅動線圈通電時，利用安裝在鏡頭外圍的驅動磁鐵與磁 性片之間的吸引力可以使移動體處於第一獲第二保持位 置，從而相機分別在第一保持位置、第二保持位置具有兩 種拍攝圖像的功能。上述鏡頭驅動裝置只能使得鏡頭具有 兩段式變焦功能，不能滿足多段式變焦之需要。 【發明内容】 有鑒於此，有必要提供一種可實現多段式變焦的鏡頭 模組。 一種鏡頭模組包括第一鏡筒、第二鏡筒和底座，所述 第一鏡筒上至少設有一個具有第一通孔的第一凸緣，所述 第二鏡筒上至少設有一個具有第二通孔的第二凸緣，所述 底座上具有與所述第一、第二凸緣配合的導桿。所述底座 上設有電磁鐵，所述第二鏡筒上設有磁性元件，所述電磁 鐵有電流通過可驅使所述磁性元件及所述第二鏡筒沿所述 導桿在第一鏡筒與底座之間運動。 相比於先前技術，該鏡頭模組通過磁性元件在電磁鐵 6 200827907 産生磁場的作用下，使第二鏡筒沿導桿運動，當電磁鐵通 - 過不同大小、方向的電流時，磁性元件受到不同的磁場影 . 響，從而受到不同的磁力，第二鏡筒在不同磁力的作用下 可沿導桿運動不同的位移。第一鏡筒與第二鏡筒之配合使 鏡頭模組具有不同的焦距，因此，該鏡頭模組可實現多段 式變焦功能。 【實施方式】 下面將結合附圖對本發明作進一步詳細說明。 請參閱圖1及圖2，本發明第一實施例提供一種可實 現多段式變焦之鏡頭模組10。該鏡頭模組10包括第一鏡 筒16、第二鏡筒11、底座12、電磁鐵13、定位結構14和 磁性元件15。 第一鏡筒16為圓筒形狀，内部設置有鏡片組162。第 一鏡筒16上設置有兩個第一凸緣160，第一凸緣160沿第 一鏡筒16外壁突出形成，且以第一鏡筒16的轴線為軸對 稱設置，第一凸緣160遠離第一鏡筒16的一端具有第一通 孔（未標不）。 第二鏡筒11為圓筒形狀，内部設置有複數鏡片組 113。第二鏡筒11上設置有兩個第二凸緣110和一個第一 凹槽112。 第二凸緣110沿第二鏡筒11外壁突出形成，且以第二 鏡筒11的軸線為轴對稱設置，第二凸緣110遠離第二鏡筒 11的一端具有第二通孔1102。 第一凹槽112位於第二鏡筒11靠近底座12的一端， 200827907 該第一凹槽112用來容納磁性元件15。磁性元件15可以 —為磁鐵或者具有礙性的金屬片等。 - 底座12為圓柱形結構，其内部設置有影像感光器 126 °底座12上設有兩個圓柱形導桿120和一個第二凹槽 124。 ‘才干120可伸入第一通孔與第二通孔1102中，以引導200827907 IX. Description of the Invention: [Technical Field] The present invention relates to a lens module, and more particularly to a multi-segment zoom lens module. [Prior Art] With the development of camera technology, camera modules are widely used in various types of camera devices. The combination of camera modules and various portable electronic devices such as mobile phones, video cameras, computers, etc., has been widely received by many consumers. Favored. In order to capture images of different magnifications, the camera usually requires a zoom function. There are two ways to achieve the camera's zoom function: optical zoom and digital zoom. The optical zoom is realized by the structure of the optical lens itself, that is, the driving device drives the lens in the lens to move or manually rotates the lens barrel to move the lens to enlarge or reduce the captured subject, and the larger the zoom magnification, the lens volume is relatively Larger, so the internal lens or image sensor has a larger moving space. The mobile phone is limited in size, and the limited space inside the body limits the movement of the lens and the image sensor. Therefore, it is difficult to realize the optical zoom in the mobile phone. Therefore, the mobile phone mostly uses the fixed focus design and the digital zoom to realize the image size change. . The so-called digital zoom is actually a kind of electronic expansion of the face, and the image pixels on the image sensor are enlarged by the internal processor of the camera to achieve the purpose of magnifying the image. Digital zoom is different from optical zoom. Although the subject shot after digital zoom is enlarged, the sharpness of the subject will decrease. In the prior art, the camera also has a requirement to achieve miniaturization by magnetically driving the lens to move the zoom, as disclosed in US Patent Application No. 2004/0130808, which discloses a lens driving device. The lens driving device comprises a moving member of the lens, a ring-shaped driving magnet mounted on the periphery of the lens, a fixing body wound around the driving coil, and at least one end of the optical axis of the lens is provided with a magnetic piece, and the moving body can be in the first holding position in the optical axis direction. Moves between the second holding position. When the driving coil is energized, the moving body can be moved from the first holding position to the second holding position by the magnetic force between the driving coil and the driving magnet, and when the driving coil is stopped, the driving magnet mounted on the periphery of the lens is used. The attraction between the magnetic sheets can cause the moving body to be in the first second holding position, so that the camera has two functions of capturing images in the first holding position and the second holding position, respectively. The above lens driving device can only make the lens have a two-stage zoom function, which cannot meet the needs of multi-stage zoom. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a lens module that can realize multi-stage zooming. A lens module includes a first lens barrel, a second lens barrel and a base, the first lens barrel is provided with at least one first flange having a first through hole, and at least one of the second lens barrel is provided a second flange having a second through hole having a guide rod that cooperates with the first and second flanges. An electromagnet is disposed on the base, a magnetic element is disposed on the second barrel, and an electromagnet has an electric current to drive the magnetic element and the second barrel along the guide rod in the first mirror Movement between the barrel and the base. Compared with the prior art, the lens module moves the second lens barrel along the guide rod by the magnetic element under the action of the magnetic field generated by the electromagnet 6 200827907. When the electromagnet passes the current of different magnitudes and directions, the magnetic element is subjected to the magnetic element. Different magnetic fields are affected by the different magnetic forces, and the second lens barrel can move differently along the guide rod under the action of different magnetic forces. The cooperation of the first lens barrel and the second lens barrel allows the lens module to have different focal lengths. Therefore, the lens module can realize a multi-stage zoom function. [Embodiment] Hereinafter, the present invention will be further described in detail with reference to the accompanying drawings. Referring to FIG. 1 and FIG. 2, a first embodiment of the present invention provides a lens module 10 that can realize multi-stage zooming. The lens module 10 includes a first lens barrel 16, a second lens barrel 11, a base 12, an electromagnet 13, a positioning structure 14, and a magnetic member 15. The first barrel 16 has a cylindrical shape, and a lens group 162 is disposed inside. The first lens barrel 16 is provided with two first flanges 160. The first flange 160 is formed to protrude along the outer wall of the first lens barrel 16, and is axially symmetrically disposed on the axis of the first lens barrel 16, the first flange. One end of the 160 away from the first barrel 16 has a first through hole (not labeled). The second barrel 11 has a cylindrical shape, and a plurality of lens groups 113 are disposed inside. The second barrel 11 is provided with two second flanges 110 and a first recess 112. The second flange 110 is formed to protrude along the outer wall of the second barrel 11, and is axially symmetric with the axis of the second barrel 11, and the second flange 110 has a second through hole 1102 away from the end of the second barrel 11. The first groove 112 is located at one end of the second barrel 11 near the base 12, and the first groove 112 is used to accommodate the magnetic element 15 in 200827907. The magnetic member 15 can be a magnet or an incompatible metal sheet or the like. - The base 12 has a cylindrical structure with an image sensor 126 inside. The base 12 is provided with two cylindrical guides 120 and a second recess 124. ‘Capability 120 can extend into the first through hole and the second through hole 1102 to guide
第二鏡筒11的運動。兩個導桿120中之一上設有複數個V f 形凹槽I22，當第二凸緣110移動至每一個V形凹槽122 犄，鏡片組162與鏡片組11：3的組合具有一個間距，因此， 鏡頭模組10可以具有多個焦距，因而，鏡頭模組10可實 現多段式變焦。可選擇地是，兩個導桿120上均設有複數 個V形凹槽122。 第二凹槽124用來容納電磁鐵13。當有電流通過電磁 鐵13時，電磁鐵13周圍産生磁場，磁性元件15受到磁場 的作用’與磁場之間産生磁力；當通過電磁鐵13電流的大 小、方向發生變化時，磁場的強度相應發生變化，此時磁 性元件15在磁場中受到的磁力也發生變化。 定位結構14設置在第二通孔1102内，其包括彈簧141 和定位珠142。彈簧14ι的一端固定在第二通孔11〇2的内 壁上，另一端與定位珠142相連。當第二凸緣no移動至 一個V形凹槽122且停止運動時，定位珠142卡入該v形 凹槽122内，在彈簧141的作用下，可使第二鏡筒u在該 位置保持定位。 第二鏡筒11通過磁性元件15在電磁鐵13産生的磁場 200827907 中受到磁力的大小和方向的變化，沿導桿120在第一鏡筒 16與底座12之間向上或向下運動，實現變焦功能，由於 每一 V形凹槽122對應一個焦距，因此，鏡頭模組10可 實現多段式變焦。 如圖3所示，本發明第二實施例提供一種可實現多段 式變焦的鏡頭模組20。該鏡頭模組20包括第一鏡筒16、 第二鏡筒11、底座12、電磁鐵13、定位結構14和磁性元 件15 〇 鏡頭模組20與鏡頭模組10不同之處為：磁性元件15 位於第二鏡筒11之第二凸緣110中。 第二鏡筒11同樣通過磁性元件15在電磁鐵13産生的 磁場中受到磁力的大小和方向的變化，沿導桿120在第一 鏡筒16與底座12之間向上或向下運動，實現多段式變焦。 綜上所述，本發明符合發明專利要件，爰依法提出專 利申請。惟，以上所述者僅為本發明之較佳實施方式，本 發明之範圍並不以上述實施方式為限，舉凡熟習本案技藝 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】 圖1係本發明第一實施例鏡頭模組之剖面示意圖。 圖2係圖1中第二鏡筒之剖面示意圖。 圖3係本發明第二實施例鏡頭模組之剖面示意圖。 【主要元件符號說明】 鏡頭模組 10,20 第一鏡筒 16 9 200827907 鏡片組 第二鏡筒 第二通孔 底座 影像感光器 V形凹槽 定位結構 定位珠 113,162 第一凸緣 160 11 第二凸緣 110 1102 第一凹槽 112 12 第二凹槽 124 126 導桿 120 122 電磁鐵 13 14 彈簧 141 142 磁性元件 15 10The movement of the second barrel 11. One of the two guide rods 120 is provided with a plurality of Vf-shaped grooves I22, and when the second flange 110 is moved to each of the V-shaped grooves 122, the combination of the lens group 162 and the lens group 11:3 has one The pitch, therefore, the lens module 10 can have multiple focal lengths, and thus, the lens module 10 can achieve multi-segment zoom. Alternatively, the plurality of guide rods 120 are provided with a plurality of V-shaped grooves 122. The second recess 124 is for receiving the electromagnet 13. When a current passes through the electromagnet 13, a magnetic field is generated around the electromagnet 13, and the magnetic element 15 is subjected to a magnetic field to generate a magnetic force between the magnetic field and the magnetic field. When the magnitude and direction of the current through the electromagnet 13 change, the intensity of the magnetic field occurs accordingly. As a result, the magnetic force received by the magnetic element 15 in the magnetic field also changes. The positioning structure 14 is disposed within the second through hole 1102 and includes a spring 141 and a positioning bead 142. One end of the spring 14i is fixed to the inner wall of the second through hole 11〇2, and the other end is connected to the positioning bead 142. When the second flange no moves to a V-shaped groove 122 and stops moving, the positioning bead 142 snaps into the v-shaped groove 122, and under the action of the spring 141, the second barrel u can be held at the position. Positioning. The second barrel 11 is subjected to a change in the magnitude and direction of the magnetic force by the magnetic element 15 in the magnetic field 200827907 generated by the electromagnet 13, and moves up or down between the first barrel 16 and the base 12 along the guide rod 120 to achieve zooming. Function, since each V-shaped groove 122 corresponds to one focal length, the lens module 10 can realize multi-stage zooming. As shown in FIG. 3, a second embodiment of the present invention provides a lens module 20 that can realize multi-stage zooming. The lens module 20 includes a first lens barrel 16, a second lens barrel 11, a base 12, an electromagnet 13, a positioning structure 14, and a magnetic element 15. The lens module 20 is different from the lens module 10 in that the magnetic element 15 is Located in the second flange 110 of the second barrel 11. The second barrel 11 is also subjected to a change in the magnitude and direction of the magnetic force in the magnetic field generated by the electromagnet 13 by the magnetic member 15, and moves up or down between the first barrel 16 and the base 12 along the guide rod 120 to realize a plurality of stages. Zoom. In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make equivalent modifications or changes in accordance with the spirit of the present invention. It should be covered by the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view showing a lens module according to a first embodiment of the present invention. 2 is a schematic cross-sectional view of the second lens barrel of FIG. 1. 3 is a cross-sectional view showing a lens module according to a second embodiment of the present invention. [Main component symbol description] Lens module 10, 20 First lens barrel 16 9 200827907 Lens group Second lens barrel Second through hole Base image Photoreceptor V-shaped groove positioning structure Positioning beads 113, 162 First flange 160 11 Second Flange 110 1102 First groove 112 12 Second groove 124 126 Guide rod 120 122 Electromagnet 13 14 Spring 141 142 Magnetic element 15 10