201040610 六、發明說明： -【發明所屬之技術領域】 本發明涉及一種鏡筒，還涉及一種應用該鏡筒之鏡頭 棋組。 【先前技術】 現有的鏡頭模組包括有一鏡座以及一螺接在所述鏡座 内的鏡筒。所述鏡座包括有一容置腔，在所述容置腔的内 Ο壁上設置有内螺紋。在所述鏡筒的外壁上設置有外螺紋， 所述鏡筒的外螺紋與所述鏡座的内螵紋相互螺接從而使所 述鏡筒固設在所述鏡座的容置腔内。然而，目前的鏡頭模 組中的鏡筒、鏡座均採用注塑成型，由於塑膠材質容易變 形’且在成型過程中難以控制鏡筒、鏡座上螺紋的精確成 型’如此便會使得所述鏡筒與鏡座組裝配合不順暢，鏡筒 與鏡座的螺紋之間存在誤差及毛邊等缺陷，從而使鏡筒與 ❹鏡座之間的摩擦力比較大，在配合的過程中容易產生掉 屑’這些掉屑落在鏡頭模組的感測器表面會嚴重影響鏡頭 模組的成像品質。 【發明内容】 有鑒於此’有必要提供一種裝配摩擦力小，不易產生 掉屑的鏡筒’以及一種應用該鏡筒之鏡頭模組。 一種鏡筒，其包括一空心柱狀的筒身，所述筒身包括 一外侧面以及一内侧面。在所述筒身的外側面上形成有環 繞所述筒身的外螺紋。在由所述筒身的外側面上等間隔地 3 201040610 形成有三個分隔所述外螺紋的弦切面。 一種鏡頭模組，其包括一鏡座，複數鏡片，一感測元 件、及鏡同。所述鏡崎螺接在所述鏡座内，所述複數鏡 片δ又置在所述鏡筒内，所述感測元件設置在所述鏡座上與 所述鏡筒相對的另一端，且位於所述鏡片的光路令。所述 鏡筒包括一空心柱狀的筒身，所述筒身包括一外側面以及 一内侧面。在所述筒身的外側面上形成有環繞所述筒身的 外螺紋。在由所述筒身的外側面上等間隔地形成有三個分 隔所述外螺紋的弦切面。 相較先前技術’本發明鏡筒以及應用該鏡筒之鏡頭模 組採用三個弦切面將所述鏡筒外側面上的螺紋分割開來， 從而減小螺紋的面積，從而減小了鏡筒在組裝過程中所產 生的摩擦力’同時也相應的減少了行程在所述螺紋上的毛 邊等雜質’減小了產生掉屑的可能性。從而，提高了鏡筒 在裝配過程中的裝配精度及可靠度。 【實施方式】 請參閱圖1，本發明第一較佳實施方式提供的一種鏡筒 100。所述鏡筒100包括一筒身110，所述筒身11〇呈空心 柱狀且包括一外側面112以及一内側面η4。在所述筒身 11〇的外侧面112上形成有環繞所述筒身u〇的外螺紋 Π6。在所述筒身11〇的外側面112上等間隔地形成有三個 分隔所述外螺紋116的弦切面ι18。 所述弦切面118是以所述外侧面112所形成的圓周内 4 201040610 的三個等間距且等長的弦為起點沿平行於所述筒身110的 軸線方向切割所述筒身110而成。所述三個弦切面118將 -所述筒身110上的外螺紋116分割為三個對稱地不連續的 主螺紋區116a。優選的，所述主螺紋區116a與所述弦切面 118對應所述外側面112所形成的圓周的圓心角相等，即所 述主螺紋區116a及所述弦切面118對應所述外側面112所 形成的圓周的圓心角為60度。所述三個弦切面118將所述 ❹笱身110外側面112上的部分外螺紋116切去，從而減少 了所述外螺紋116的面積，從而使安裝該鏡筒1〇〇時，由 所述螺紋116所產生的摩擦力減小，由此，使得在製造過 程中存在的誤差對鏡筒1〇〇的安裝精度的影響減小。此外， 由於設置三個弦切面118將外螺紋116所占的面積減小， 因此減少了形成在螺牙上的毛邊等雜質，防止鏡筒在旋轉 安裝過程中由於摩擦力將所述毛邊等雜質剝落而停留在鏡 座的内螺紋中或者感測器表面對鏡筒的安裝以及鏡頭模組 ❹的成像品質產生影響。從而，提高了鏡筒在裝配過程中的 裝配精度及可罪度。設置三個弦切面118使所述外螺紋 被分割成二個主螺紋區116a，所述三個主螺紋區相互 對稱，在安裝過程中所述三個主螺紋區U6a分別螺接在鏡 座的内螺紋的三個不同位置處，根據三個點確定一面的原 理，通過所述二個分離的主螺紋區116a使得所述鏡筒 精確的安裝在鏡座内，且在鏡座局部發生變形時，所述相 互分隔主螺紋區116a可各自適應性的變形而不影響整個鏡 筒no在鏡座中的位置。3外，採用三個弦切面118將所 5 201040610 述外螺紋116分割，不但可減少所述外螺紋116上的螺牙 所占的面積，同時不增加所述鏡筒1〇〇的筒身110的厚度， 且便於作業員清理形成在螺牙上的毛邊，進一步減少掉屑。 請參閱圖2,本發明較佳實施方式提供的一種應用所述 鏡筒100的鏡頭模組200。該鏡頭模組200包括一鏡座210, Ο 複數鏡片220 ’以及一感測元件230。所述鏡筒100螺接在 所述鏡座210内。所述複數鏡片220設置在所述鏡筒1〇〇 内。所述感測元件230設置在所述鏡座210上與所述鏡筒 1〇〇相對的另一端，且位於所述鏡片220的光路中。 請參閱圖3及圖心本發明第二較佳實施方式提供的一 種鏡筒300,該鏡筒300與鏡筒200相似包括一筒身31〇, 所述筒身310呈空心柱狀且包括-外側面312以及一内側 面314。在所述筒身310的外侧面312上形成有環繞所述筒 身310的外螺紋316。在所述筒身31〇的外側面312上等間 隔地形成有三個分隔所述外螺紋316的弦切面318,所述弦 0切面规將所述外螺紋316分割成三個等間隔的主螺紋區 3W。其不同之處在於：在所述鏡筒3〇〇的弦切面仙上 形成有子螺紋315。所述子螺紋315與所述外螺纹316的主 螺故區3偷相連接。所述子螺紋315的 =外螺紋316的螺牙高度H。優選地，所述子螺紋315的斤 螺牙高度h與所述外螺紋316的螺牙高度h的高度差為 〇.〇2mm。 請參閱圖5,本發明較佳實施方式提供的—種應用所述 見筒300的鏡頭模組400。該鏡頭模組4〇〇包括一鏡座41〇, 6 201040610 複數鏡片420，以及一感測元件430。所述鏡座410内側設 置有内螺紋412,所述鏡筒300通過其外螺紋316螺接在所 述鏡座410内。所述複數鏡片420設置在所述鏡筒300内。 所述感測元件430設置在所述鏡座410上與所述鏡筒300 相對的另一端，且位於所述鏡片320的光路中。所述鏡筒 300的子螺紋315容置在所述鏡座410的内螺紋412之間， 由於所述子螺紋315的螺牙高度h小於所述外螺紋316的 螺牙高度Η，因此。所述子螺紋315容置在所述鏡座410 的内螺紋412之間時與所述鏡座410的内螺紋412之間間 隔一定距離，從而不僅可以減小鏡筒300在安裝過程中的 摩擦力同時可以阻擋灰塵或其他顆粒由弦切面318與鏡座 400之間的缺口處落入鏡頭模組400的内部。 為了使子螺紋315與所述鏡座410的内螺紋412的干 涉進一步減少，可使所述子螺紋315的螺牙根部厚度t小於 所述外螺紋316的螺牙根部厚度T。 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係本發明鏡筒第一較佳實施方式的立體示意圖； 圖2係應用圖1中鏡筒的鏡頭模組的剖視圖； 7 201040610 圖3係本發明鏡筒第二較佳實施方式的立體示意圖； 圖4係圖3中鏡筒的俯視圖； 圖5係應用圖3中鏡筒的鏡頭模組的剖視圖。 【主要元件符號說明】 鏡筒 100,300 筒身 110,310 外側面 112, 312 内侧面 114, 314 外螺紋 116, 316 主螺紋區 116a，316a 弦切面 118, 318 鏡頭模組 200,400 鏡座 210,410 鏡片 220,420 感測元件 230,430 子螺紋 315201040610 VI. Description of the Invention: - Technical Field to Which the Invention A Field The present invention relates to a lens barrel, and to a lens set to which the lens barrel is applied. [Prior Art] A conventional lens module includes a lens holder and a lens barrel screwed into the lens holder. The lens holder includes a receiving cavity, and an internal thread is disposed on the inner wall of the receiving cavity. An external thread is disposed on the outer wall of the lens barrel, and the external thread of the lens barrel is screwed to the inner ridge of the lens holder to fix the lens barrel in the accommodating cavity of the lens holder. . However, the lens barrel and the lens holder in the current lens module are all injection molded, because the plastic material is easily deformed, and it is difficult to control the precise formation of the lens barrel and the thread on the lens holder during the molding process. The assembly of the barrel and the lens holder is not smooth, and there are defects such as errors and burrs between the lens barrel and the mirror base, so that the friction between the lens barrel and the lens holder is relatively large, and the chip is easily generated during the fitting process. 'The loss of these chips on the sensor surface of the lens module will seriously affect the imaging quality of the lens module. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a lens barrel which has a small frictional assembly and is less prone to chipping, and a lens module to which the lens barrel is applied. A lens barrel includes a hollow cylindrical body, the barrel including an outer side and an inner side. An external thread that surrounds the barrel is formed on an outer side surface of the barrel. Three chord faces separating the external threads are formed at equal intervals 3 201040610 from the outer side faces of the barrel. A lens module includes a lens holder, a plurality of lenses, a sensing element, and a mirror. The mirror is screwed into the lens holder, the plurality of lenses δ are placed in the lens barrel, and the sensing element is disposed on the mirror holder at the other end opposite to the lens barrel, and is located at The optical path of the lens. The lens barrel includes a hollow cylindrical body, the barrel including an outer side and an inner side. An external thread surrounding the barrel is formed on an outer side surface of the barrel. Three chordal surfaces separating the external threads are formed at equal intervals on the outer side surface of the barrel. Compared with the prior art, the lens barrel of the present invention and the lens module using the same use three chord cut surfaces to divide the threads on the outer side of the lens barrel, thereby reducing the area of the thread, thereby reducing the lens barrel. The frictional force generated during the assembly process also reduces the amount of impurities such as burrs on the thread to reduce the possibility of chipping. Thereby, the assembly precision and reliability of the lens barrel in the assembly process are improved. Embodiments Please refer to FIG. 1, a lens barrel 100 according to a first preferred embodiment of the present invention. The lens barrel 100 includes a barrel body 110 which is hollow cylindrical and includes an outer side surface 112 and an inner side surface η4. An external thread Π6 surrounding the barrel body 形成 is formed on the outer side surface 112 of the barrel body 11〇. Three chord planes ι18 separating the external threads 116 are formed at equal intervals on the outer side surface 112 of the barrel 11''. The chord section 118 is formed by cutting the cylinder 110 parallel to the axial direction of the barrel 110 from three equally spaced and equal length chords in the circumference 4 201040610 formed by the outer side surface 112. . The three chord sections 118 divide the external threads 116 on the barrel 110 into three symmetrically discontinuous main thread zones 116a. Preferably, the main threaded region 116a and the chord section 118 are equal to the central angle of the circumference formed by the outer side surface 112, that is, the main threaded area 116a and the chord section 118 correspond to the outer side surface 112. The central angle of the formed circumference is 60 degrees. The three chord sections 118 cut off a portion of the external thread 116 on the outer side 112 of the body 110, thereby reducing the area of the external thread 116, thereby enabling the mounting of the barrel 1 The frictional force generated by the thread 116 is reduced, whereby the influence of the error existing in the manufacturing process on the mounting accuracy of the lens barrel 1〇〇 is reduced. In addition, since the area occupied by the external thread 116 is reduced by providing three chord sections 118, impurities such as burrs formed on the screw teeth are reduced, and the burrs and the like are prevented from being rubbed by the lens barrel during the rotational mounting process. Peeling off and staying in the internal thread of the lens holder or the surface of the sensor affects the mounting of the lens barrel and the image quality of the lens module. Thereby, the assembly precision and the guilt of the lens barrel during assembly are improved. Three chord sections 118 are provided to divide the external thread into two main thread zones 116a, the three main thread zones being symmetrical to each other, and the three main thread zones U6a are respectively screwed to the mirror base during installation. At three different positions of the internal thread, the principle of determining one side according to three points, the lens barrel is accurately mounted in the lens holder through the two separate main thread regions 116a, and when the lens holder is locally deformed The mutually separated main thread regions 116a can be adaptively deformed without affecting the position of the entire barrel no in the lens holder. 3, the external thread 116 of the 5 201040610 is divided by three chord sections 118, which not only reduces the area occupied by the thread on the external thread 116, but also does not increase the barrel 110 of the barrel 1 . The thickness is convenient for the operator to clean the burrs formed on the thread to further reduce the chipping. Referring to FIG. 2, a lens module 200 for applying the lens barrel 100 according to a preferred embodiment of the present invention is provided. The lens module 200 includes a lens holder 210, a plurality of lenses 220' and a sensing element 230. The lens barrel 100 is screwed into the lens holder 210. The plurality of lenses 220 are disposed in the barrel 1〇〇. The sensing element 230 is disposed on the other end of the lens holder 210 opposite to the lens barrel 1 and is located in the optical path of the lens 220. Referring to FIG. 3 and FIG. 3, a lens barrel 300 according to a second preferred embodiment of the present invention includes a barrel 31 相似 similar to the lens barrel 200, and the barrel 310 has a hollow column shape and includes - Outer side 312 and an inner side 314. An external thread 316 surrounding the barrel 310 is formed on the outer side 312 of the barrel 310. Three chord planes 318 separating the external threads 316 are formed at equal intervals on the outer side surface 312 of the barrel 31〇, and the chord 0 section divides the external thread 316 into three equally spaced main threads. District 3W. The difference is that a sub-thread 315 is formed on the chord face of the lens barrel 3〇〇. The sub-thread 315 is stolenly connected to the main screw region 3 of the external thread 316. The thread height HR of the sub-thread 315 = the external thread 316. Preferably, the difference in height between the thread height h of the sub-thread 315 and the thread height h of the external thread 316 is 〇.〇2 mm. Referring to FIG. 5, a lens module 400 for applying the cartridge 300 is provided by a preferred embodiment of the present invention. The lens module 4 includes a lens holder 41, 6 201040610, a plurality of lenses 420, and a sensing element 430. The inner side of the lens holder 410 is provided with an internal thread 412, and the lens barrel 300 is screwed into the lens holder 410 by its external thread 316. The plurality of lenses 420 are disposed within the lens barrel 300. The sensing element 430 is disposed at the other end of the lens holder 410 opposite to the lens barrel 300 and is located in the optical path of the lens 320. The sub-thread 315 of the lens barrel 300 is received between the internal threads 412 of the lens holder 410, since the thread height h of the sub-thread 315 is smaller than the thread height Η of the external thread 316. The sub-thread 315 is disposed at a distance from the internal thread 412 of the lens holder 410 when being received between the internal threads 412 of the lens holder 410, so that the friction of the lens barrel 300 during installation can be reduced. The force can also block dust or other particles from falling into the interior of the lens module 400 by the gap between the chord plane 318 and the mirror mount 400. In order to further reduce the interference of the sub-thread 315 with the internal thread 412 of the lens holder 410, the root thickness t of the sub-thread 315 can be made smaller than the root thickness T of the external thread 316. 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 equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention are It should be covered by the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a first preferred embodiment of a lens barrel of the present invention; Figure 2 is a cross-sectional view of a lens module to which the lens barrel of Figure 1 is applied; 7 201040610 Figure 3 is a second lens barrel of the present invention 3 is a top view of the lens barrel of FIG. 3; and FIG. 5 is a cross-sectional view of the lens module to which the lens barrel of FIG. 3 is applied. [Main component symbol description] Lens barrel 100, 300 barrel 110, 310 outer side 112, 312 inner side 114, 314 external thread 116, 316 main thread area 116a, 316a Chord section 118, 318 lens module 200, 400 lens holder 210, 410 lens 220, 420 sensing element 230,430 sub-thread 315