201000981 * 九、發明說明： ' 【發明所屬之技術領域】 本發明涉及光學成像技術，尤其涉及一種鏡頭模組及 其組裝方法。 【先前技術】 隨著光學成像技術之發展，鏡頭模組於各種成像裝置 如數位相機、攝像機中得到廣泛應用（請參見Capturing images with digital still cameras, Micro, IEEE Volume:18, issue:6,Nov.-Dec.l998 Page(s):14-19)。整合有鏡頭模組之 手機、筆記本等便攜式電子裝置，更係得到眾多消費者之 青睞。 先前技術中之一種鏡頭模組20如圖8所示，其包括一 個鏡筒202,及從物側到像側依次設置於鏡筒202内之第一 鏡片204，遮光片210，第二鏡片206，間隔體212及第三 鏡片208。鏡筒202内之鏡片等光學元件一般係通過點膠固 定於鏡筒202内。 然，若上述光學元件點膠固定不牢固或者膠水老化 時，鏡頭模組20之強度會下降。如圖9所示，當鏡頭模組 20受熱時，鏡頭模組20中之鏡片可能會因為受熱膨脹變 形，由於第一鏡片204承靠於鏡筒202之承載部2022，故 鏡頭模組20中之各光學元件沿著光軸214向著遠離鏡筒 202承載部2022之方向膨脹或位移，從而降低鏡頭模組20 内部結構之穩定性，進而降低鏡頭模組20之成像品質。類 201000981 # • 2地，當鏡碩模組20受到震動時，鏡頭模組2〇中之各光 子疋件可能會沿著光軸214向著遠離鏡筒2〇2承載部 之方向位移，從而降低鏡頭模組2〇内部結構之穩定性。 【發明内容】 有鑒於此，有必要提供一種結構穩定性更佳之鏡頭模 組及其組裝方法。 :種鏡頭模組，其包括··一鏡筒，該鏡筒之内壁設置 有P突起；一收容於該鏡筒内之一鏡片單元；—收容於該 ，筒内之定位環’該定位環為具有缺口之不連續圓環，該 疋位％包括一頂面和一底面，該底面與該鏡片單元貼合， 該，面與該突起貼合，該突起與該缺口相互錯開以將該鏡 片早元固定於該鏡筒内。 一種組裝上述鏡頭模組之組裝方法，其包括以下步 驟：將該鏡片單元組裝入該鏡筒内；將該定位環之缺口對 準該鏡筒之突起；將該定位環放進該鏡筒内，使該定位環 之底面與該鏡片單元之表面貼合；及旋轉該定位環使該定 位裱之缺口與該鏡筒内壁之突起相互錯開，以將該鏡片單 元固定於該鏡筒内。 相對於先前技術，上述鏡頭模組之鏡筒内壁設置有突 起疋位環之頂面抵靠於突起。當鏡頭模組中之鏡片單元 文熱時，由於定位環受突起之抵擋，定位環可阻止上述光 學元件沿著光軸之方向發生膨脹或位移，由此減少或者消 除各光學元件之受熱膨脹變形，從而提高鏡頭模組内部結 201000981 構之穩定性，進而提升鏡頭模組之成像品質。同理，當鏡 頭模組受到震動時，由於定位環受突起之抵擋，定位環同 樣可阻止上述光學元件沿著光軸之方向發生位移，從而提 高鏡頭模組内部結構之穩定性，進而提升鏡頭模組之成像 品質。此外，採用上述組裝方法得到之鏡頭模組具有同樣 之優點。 【實施方式】 下面將結合附圖，對本發明作進一步之詳細說明。 請參閱圖1、圖2及圖3，本發明第一實施例之鏡頭模 組10包括一個鏡筒102及收容於鏡筒102内之一個鏡片單 元。鏡片單元從物侧到像侧依次包括第一鏡片104，遮光片 110，第二鏡片106，間隔體112，第三鏡片108及定位環 114。鏡片單元具有一光軸116。 鏡筒102自物側到像侧依次包括相互連接之第一段鏡 筒1022和第二段鏡筒1024。第一段鏡筒1022之一端具有 一承載部1021，承载部1021開設有一個通孔1028，通孔 1028允許外界光入射到鏡筒102内。第二段鏡筒1024之内 壁向内設置有一個突起1023，突起1023用於抵擋定位環 114，從而將定位環114固定於鏡筒102内。為了方便將第 一鏡片104等光學元件組裝到鏡筒1〇2内，第二段鏡筒1024 之内徑略大於第一段鏡筒1022之内徑。於本實施例中，鏡 片單元之第一鏡片104等光學元件均收容於第一段鏡筒 1022内。鏡筒102設有外螺紋，外螺紋用於與鏡座（圖未 7 201000981 示）配合。 第一鏡片104直接承靠於鏡筒102之承載部1021上。 第一鏡片104、第二鏡片106及第三鏡片108共同配合成 像。第一鏡片104、第二鏡片106及第三鏡片108可係球面 透鏡或者非球面透鏡，於本實施例中，優選地均為非球面 透鏡。第一鏡片104、第二鏡片106及第三鏡片108可係玻 璃透鏡或者塑膠透鏡等。遮光片110用於遮擋光線，避免 光線穿過第二鏡片106之週邊支撐部（即非光學部）。間隔 體112用於保持第二鏡片106及第三鏡片108之間之固定 間隔。 請一起參閱圖4，定位環114為一個不連續之圓環，即 定位環114為一個具有缺口 1146之圓環。缺口 1146之尺 寸與鏡筒102内壁之突起1023之尺寸相應，優選地，缺口 1146之尺寸略大於突起1023之尺寸，以方便將定位環114 組裝到鏡筒102内。定位環114中心具有一通孔1148，通 孔1148允許光線穿過定位環114。定位環114具有相對之 一頂面1142和一底面1144，底面1144與第三鏡片108之 表面1082貼合，頂面1142抵靠於鏡筒102内壁之突起 1023。進一步，定位環114通過點膠固定於鏡筒102内， 從而將定位環114更牢固地固定於鏡筒102。定位環114可 由塑膠或金屬等材料製得，優選地，採用硬度較高之塑膠 或者金屬，如鐵、不銹鋼等。 上述鏡頭模組10之鏡筒102内壁設置有突起1023,定 位環114之頂面1142抵靠於鏡筒102内壁之突起1023。當 8 201000981 鏡頭模組10中之光學元件（如第一鏡片104,第二鏡片106 及第三鏡片108)受熱時，由於定位環114受突起1023之 抵擋，定位環114可阻止上述光學元件沿著光軸116之方 向發生膨脹或位移，由此減少或者消除各光學元件之受熱 膨脹變形，從而提高鏡頭模組10内部結構之穩定性，進而 提升鏡頭模組10之成像品質。 同理，當鏡頭模組10受到震動時，由於定位環114受 突起1023之抵擋，定位環114同樣可阻止上述光學元件沿 著光軸116之方向發生位移，從而提高鏡頭模組10内部結 構之穩定性，進而提升鏡頭模組10之成像品質。 此外，本發明還提供一種鏡頭模組10之組裝方法。該 方法包括以下步驟： 首先，將第一鏡片104，遮光片110，第二鏡片106， 間隔體112及第三鏡片108依次組裝入鏡筒102内，並使 第一鏡片104直接承靠於鏡筒102之承載部1021上，後一 光學元件依次承靠於前一光學元件上。 其次，於第三鏡片108之側壁與鏡筒102之内壁之間 點膠固定。 再次，將定位環114之缺口 1146對準鏡筒102内壁上 之突起1023，如圖5所示。 然後，將定位環114放進鏡筒102内，將定位環114 之底面1144與第三鏡片108之表面1082貼合，如圖6所 示。 最後，旋轉定位環114使定位環114之缺口 1146與鏡 201000981 .筒102内壁之突起1023相互錯開，於鏡筒i〇2與定位環m 之間點谬固^，從而得到如圖1及圖2所示之鏡頭模組10。 請參閱圖7，本發明第二實施例之定位環2丄4與第一實 j例之疋位if 114類似，區別在於：定位環之頂面2⑷上 口又置有個大起2145。當定位環214組裝入鏡筒1〇2後， 通過撥動突起2145可方便地旋轉定位環214至合適之位 置。 θ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 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立體示意圖； 圖2係圖1所示鏡頭模組沿著π_π線之剖面示意圏； k 圖3係圖1所示鏡頭模組中鏡筒之立體示意圖； 圖4係圖1所示鏡頭模組中定位環之立體示意圖； 圖5係圖1所示鏡頭模組組裝之第一狀態示意圖； 圖6係圖1所示鏡頭模組組裝之第二狀態示意圖，· 圖7係本發明第二實施例定位環之立體示意圖； 圖8係先前技術中一種鏡頭模組之剖面示意圖； 圖9係圖8所示鏡頭模組中之光學元件受熱膨脹時之 狀態示意圖。 201000981 【主要元件符號說明】 鏡頭模組 20、10 鏡阊 202 、 102 第一鏡片 204 、 104 遮光片 210 、 110 第二鏡片 206 、 106 間隔體 212 、 112 第三鏡片 208 > 108 承載部 2022 ' 1021 定位環 214 、 114 光轴 116 第一段鏡筒 1022 第二段鏡筒 1024 鏡筒之通孔 1028 定位環之通孔 1148 鏡筒之突起 1023 定位環之突起 2145 缺口 1146 頂面 1142 、 2142 底面 1144 表面 1082 11201000981 * IX. Description of the invention: 'Technical field of the invention>> The present invention relates to optical imaging technology, and more particularly to a lens module and an assembly method thereof. [Prior Art] With the development of optical imaging technology, lens modules are widely used in various imaging devices such as digital cameras and video cameras (see Capturing images with digital still cameras, Micro, IEEE Volume: 18, issue: 6, Nov .-Dec.l998 Page(s): 14-19). Portable electronic devices such as mobile phones and notebooks that incorporate lens modules are favored by many consumers. As shown in FIG. 8, a lens module 20 of the prior art includes a lens barrel 202, and a first lens 204, a light shielding film 210, and a second lens 206 which are disposed in the lens barrel 202 from the object side to the image side. The spacer 212 and the third lens 208. Optical elements such as lenses in the lens barrel 202 are generally fixed in the lens barrel 202 by dispensing. However, if the optical component is not firmly fixed or the glue is aged, the strength of the lens module 20 may decrease. As shown in FIG. 9 , when the lens module 20 is heated, the lens in the lens module 20 may be deformed by thermal expansion. Since the first lens 204 bears against the bearing portion 2022 of the lens barrel 202 , the lens module 20 is The optical elements are expanded or displaced along the optical axis 214 away from the carrying portion 2022 of the lens barrel 202, thereby reducing the stability of the internal structure of the lens module 20, thereby reducing the imaging quality of the lens module 20. Class 201000981 # • 2 ground, when the mirror module 20 is subjected to vibration, the photonic elements in the lens module 2〇 may be displaced along the optical axis 214 away from the bearing portion of the lens barrel 2〇2, thereby reducing The stability of the internal structure of the lens module 2〇. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a lens module and a method of assembling the same with better structural stability. a lens module comprising: a lens barrel, the inner wall of the lens barrel is provided with a P protrusion; a lens unit received in the lens barrel; and a positioning ring received in the tube; the positioning ring In the case of a discontinuous ring having a notch, the nibbi % includes a top surface and a bottom surface, the bottom surface being in contact with the lens unit, the surface being attached to the protrusion, the protrusion and the notch being offset from each other to the lens The early element is fixed in the lens barrel. An assembly method for assembling the lens module, comprising the steps of: loading the lens unit into the lens barrel; aligning the notch of the positioning ring with the protrusion of the lens barrel; placing the positioning ring into the lens barrel Aligning the bottom surface of the positioning ring with the surface of the lens unit; and rotating the positioning ring to offset the notch of the positioning ridge and the protrusion of the inner wall of the lens barrel to fix the lens unit in the lens barrel. In contrast to the prior art, the inner wall of the lens barrel of the lens module is provided with a top surface of the protruding clamp ring abutting against the protrusion. When the lens unit in the lens module is hot, since the positioning ring is resisted by the protrusion, the positioning ring can prevent the optical element from expanding or displaceing along the optical axis, thereby reducing or eliminating the thermal expansion deformation of each optical element. Therefore, the stability of the internal structure of the lens module 201000981 is improved, thereby improving the imaging quality of the lens module. Similarly, when the lens module is subjected to vibration, since the positioning ring is resisted by the protrusion, the positioning ring can also prevent the optical component from being displaced along the optical axis, thereby improving the stability of the internal structure of the lens module, thereby improving the lens. The imaging quality of the module. In addition, the lens module obtained by the above assembly method has the same advantages. [Embodiment] Hereinafter, the present invention will be further described in detail with reference to the accompanying drawings. Referring to FIG. 1, FIG. 2 and FIG. 3, a lens module 10 according to a first embodiment of the present invention includes a lens barrel 102 and a lens unit housed in the lens barrel 102. The lens unit includes a first lens 104, a light shielding film 110, a second lens 106, a spacer 112, a third lens 108, and a positioning ring 114 in this order from the object side to the image side. The lens unit has an optical axis 116. The lens barrel 102 includes, in order from the object side to the image side, a first segment lens barrel 1022 and a second segment lens barrel 1024 which are connected to each other. One end of the first stage lens barrel 1022 has a carrying portion 1021, and the carrying portion 1021 is provided with a through hole 1028 for allowing external light to enter the lens barrel 102. The inner wall of the second stage barrel 1024 is provided with a protrusion 1023 inwardly for resisting the positioning ring 114 to fix the positioning ring 114 in the barrel 102. In order to facilitate assembly of the optical element such as the first lens 104 into the lens barrel 1 2, the inner diameter of the second stage lens barrel 1024 is slightly larger than the inner diameter of the first stage lens barrel 1022. In this embodiment, the optical elements such as the first lens 104 of the lens unit are housed in the first segment of the lens barrel 1022. The lens barrel 102 is provided with an external thread, and the external thread is used to cooperate with the lens holder (not shown in Fig. 7 201000981). The first lens 104 directly bears against the bearing portion 1021 of the lens barrel 102. The first lens 104, the second lens 106, and the third lens 108 are combined to form a composite image. The first lens 104, the second lens 106, and the third lens 108 may be spherical lenses or aspherical lenses, and in the present embodiment, are preferably aspherical lenses. The first lens 104, the second lens 106, and the third lens 108 may be glass lenses or plastic lenses. The light shielding sheet 110 is for blocking light and preventing light from passing through the peripheral support portion (i.e., the non-optical portion) of the second lens 106. Spacer 112 is used to maintain a fixed spacing between second lens 106 and third lens 108. Referring to Figure 4 together, the positioning ring 114 is a discontinuous ring, i.e., the positioning ring 114 is a ring having a notch 1146. The size of the notch 1146 corresponds to the size of the protrusion 1023 of the inner wall of the lens barrel 102. Preferably, the size of the notch 1146 is slightly larger than the size of the protrusion 1023 to facilitate assembly of the positioning ring 114 into the lens barrel 102. The center of the locating ring 114 has a through hole 1148 that allows light to pass through the locating ring 114. The positioning ring 114 has a top surface 1142 and a bottom surface 1144. The bottom surface 1144 is in contact with the surface 1082 of the third lens 108. The top surface 1142 abuts against the protrusion 1023 of the inner wall of the lens barrel 102. Further, the positioning ring 114 is fixed in the lens barrel 102 by dispensing, thereby fixing the positioning ring 114 to the lens barrel 102 more firmly. The positioning ring 114 may be made of a material such as plastic or metal, preferably a plastic or metal having a higher hardness such as iron, stainless steel or the like. The inner wall of the lens barrel 102 of the lens module 10 is provided with a protrusion 1023, and the top surface 1142 of the positioning ring 114 abuts against the protrusion 1023 of the inner wall of the lens barrel 102. When the optical components (such as the first lens 104, the second lens 106, and the third lens 108) in the lens module 10 of 8 201000981 are heated, the positioning ring 114 can block the optical component along the edge due to the positioning ring 114 being resisted by the protrusion 1023. The direction of the optical axis 116 is expanded or displaced, thereby reducing or eliminating the thermal expansion deformation of each optical component, thereby improving the stability of the internal structure of the lens module 10, thereby improving the imaging quality of the lens module 10. Similarly, when the lens module 10 is subjected to vibration, since the positioning ring 114 is resisted by the protrusions 1023, the positioning ring 114 can also prevent the optical element from being displaced along the optical axis 116, thereby improving the internal structure of the lens module 10. Stability, which in turn improves the imaging quality of the lens module 10. In addition, the present invention also provides a method of assembling the lens module 10. The method includes the following steps: First, the first lens 104, the light shielding film 110, the second lens 106, the spacer 112 and the third lens 108 are sequentially assembled into the lens barrel 102, and the first lens 104 is directly supported by the mirror. On the carrier 1021 of the cartridge 102, the latter optical element in turn bears against the previous optical component. Next, the side wall of the third lens 108 and the inner wall of the lens barrel 102 are glued and fixed. Again, the notch 1146 of the retaining ring 114 is aligned with the projection 1023 on the inner wall of the barrel 102, as shown in FIG. Then, the positioning ring 114 is placed in the lens barrel 102, and the bottom surface 1144 of the positioning ring 114 is attached to the surface 1082 of the third lens 108, as shown in FIG. Finally, the positioning ring 114 is rotated to make the notch 1146 of the positioning ring 114 and the lens 201000981. The protrusions 1023 of the inner wall of the cylinder 102 are offset from each other, and are fixed between the lens barrel i〇2 and the positioning ring m, thereby obtaining a figure as shown in FIG. 1 and FIG. The lens module 10 shown in FIG. Referring to FIG. 7, the positioning ring 2丄4 of the second embodiment of the present invention is similar to the first position if 114 of the first embodiment, except that the upper surface of the top surface 2(4) of the positioning ring is further provided with a large opening 2145. When the positioning ring 214 is assembled into the lens barrel 1 2, the positioning ring 214 can be easily rotated to a suitable position by the toggle protrusion 2145. In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application in accordance with the law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light 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 perspective view of a lens module according to a first embodiment of the present invention; FIG. 2 is a schematic view of the lens module shown in FIG. 1 along a π_π line; k FIG. 3 is a lens shown in FIG. Figure 3 is a perspective view of the positioning ring of the lens module shown in Figure 1; Figure 5 is a schematic view of the first state of the lens module assembly shown in Figure 1; Figure 6 is shown in Figure 1. FIG. 7 is a perspective view of a positioning ring according to a second embodiment of the present invention; FIG. 8 is a schematic cross-sectional view of a lens module in the prior art; FIG. 9 is a lens module shown in FIG. Schematic diagram of the state in which the optical component is thermally expanded. 201000981 [Description of main component symbols] Lens module 20, 10 mirror 202, 102 first lens 204, 104 visor 210, 110 second lens 206, 106 spacer 212, 112 third lens 208 > 108 carrier 2022 1021 Locating ring 214, 114 Optical axis 116 First stage lens barrel 1022 Second stage lens barrel 1024 Barrel through hole 1028 Positioning ring through hole 1148 Lens tube protrusion 1023 Positioning ring protrusion 2145 Notch 1146 Top surface 1142 2142 bottom surface 1144 surface 1082 11