200912416 九、發明說明： 【發明所屬之技術領域】 夕旦^發明提供—種鏡頭筒’尤其提供—種具有變焦系統 之衫像設備使用之鏡頭筒。 【先前技術】 -般投影儀之變焦鏡頭包括有鏡賴和鏡片組。該鏡 !"有兩個鏡筒，-個鏡筒固定在投影儀上，一個鏡 ==固定，做—定角度之轉動。可旋轉之鏡頭 ΙΓ 倍鏡同’固定在投影儀上之鏡頭筒為固定鏡 二:_筒套於固定鏡筒外面。所述鏡片組容置入固定 鏡~内。 曰刖 固定nir 屬材f，當變倍鏡筒相制 =鏡_轉時，變倍鏡筒f與固定鏡筒在鏡片組之光轴 本置111定，使變倍鏡筒只繞固定鏡筒轉動，而 地沿鏡頭之光軸方句移動。^ 念 能相胃v A斤乂，兩要存在讓變倍鏡筒不 Λ::二ΐ 動之結構。目前，該防止結構便 ====!!，該止動槽是穿透式槽，-般 定鏡芮固…门卜。^ ° 又置，止動螺絲穿過止動槽與固 h同k ’因此’變倍鏡筒在 方向相對固定鏡筒滑動。 W 者先軸 置於：二圖:中為習知鏡頭筒之组合示意圖。鏡片組内 定"6二I，固疋鏡筒6内套於變倍鏡筒5内。固 疋鏡心上财穿透式直進槽61，該穿透式直進槽之方口向 200912416 與鏡片組之光軸方向一致，變倍鏡筒5上有穿透式導向槽 53及穿透式止動槽51。變倍鏡筒5上之穿透式導向槽53 與固定鏡筒6上之穿透式直進槽61相對應。變倍鏡筒5上 之穿透式止動槽51方向與鏡片組光轴方向垂直，且該穿透 式止動槽51有一定長度，這樣可以控制變倍鏡筒5旋轉之 角度。止動螺絲52穿過變倍鏡筒上之穿透式止動槽51固 定於固定鏡筒6上，使變倍鏡筒5不會相對於固定鏡筒6 沿光軸方向移動。導銷54穿過變倍鏡筒5上之穿透式導向 槽及固定鏡筒6上之穿透式直進槽61與固定鏡筒6内之鏡 片組固定。當變倍鏡筒5在外力作用下旋轉時，帶動導銷 54在穿透式導向槽53中運動，同時，在穿透式直進槽61 中沿光軸方向移動，這樣帶動裏面之鏡片組在固定鏡筒6 中沿光軸方向移動，達到變焦之目的。 而在生產組裝線上實際組裝時，止動螺絲、止動槽、 導銷、直進槽、導向槽以及鏡片組需要密切配合，才可以 組裝完美，該道工序_需要細心組裝，這樣才可以達到要求， 很多情況會導致組裝出現錯誤，需要返工，這樣極有可能 會影像到鏡頭品質，甚至鏡頭報廢。 【發明内容】 有鑒於此，有必要提供一種簡單易裝之鏡頭筒，以降 低組裝報廢率。 一種鏡頭筒，包括一固定鏡筒、一旋轉鏡筒，所述固 定鏡筒内可容納鏡片組。所述旋轉鏡筒可轉動地套設於所 述固定鏡筒外，所述固定鏡筒及旋轉鏡筒上分別設置有可 7 200912416 相互配合之限位結構，該限位結構用以防止所述旋轉鏡筒 — 相對所述固定鏡筒發生轴向偏移。 - 本發明所述之鏡頭筒之固定鏡筒及旋轉鏡筒上均設置 有限位結構，所述固定鏡筒可通過該限位結構與旋轉鏡筒 配合，該限位結構分別與固定鏡筒及旋轉鏡筒一體成型， 組裝時直接套合即可，不需要使用額外之零組件，簡單快 捷，減少生產工時，相對降低生產成本，提升廠家之競爭 力。 為了更詳細的說明本發明，下面以附圖結合實施方式 加以進一步說明。 【實施方式】 請參閱圖2,為本發明實施方式之鏡頭筒分解示意圖。 該鏡頭筒可用于傳統照相機、數位照相機、攝影機，也可 用於投影儀，在本實施方式中該鏡頭筒用於投影儀。 鏡頭筒包括旋轉鏡筒1，固定鏡筒2、鏡片組3及導向 件4。旋轉鏡筒1及固定鏡筒2為中空圓筒形。所述固定 鏡筒2固定於投影儀（圖中未晝出）上，所述旋轉鏡筒1 套設於固定鏡筒2外，並可相對固定鏡筒2轉動。所述鏡 片組3容置於固定鏡筒2中。所述導向件4穿過固定鏡筒 2及旋轉鏡筒1與鏡片組3固接。 上述旋轉鏡筒1上設有穿透式導向槽Π，穿透式半開 口入進槽13以及一限位結構，本實施方式中，該限位結構 為一設置於所述旋轉鏡筒1内壁之内週槽12。 所述穿透式導向槽11設置於所述旋轉鏡筒1之侧壁， 8 200912416 為一細長形槽，其方向與鏡片組3之光轴方向00’傾斜。 — 所述穿透式半開口入進槽13設置於所述旋轉鏡筒1之一端 - 邊緣。所述内週槽12設置於所述旋轉鏡筒1之内壁並與上 述穿透式半開口入進槽13同處一端，該内週槽12與該穿 透式半開口入進槽13相互連通。 上述固定鏡筒2上設有穿透式直進槽21與一限位結 構，本實施方式中，該限位結構為一凸塊22。 所述穿透式直進槽21設置於所述固定鏡筒2之侧壁， 為一細長形槽，該穿透式直進槽21之方向與鏡片組3之光 軸OCT方向平行。所述凸塊22設置於所述固定鏡筒2之一 端，與該固定鏡筒2—體成型。 所述固定鏡筒2上之穿透式直進槽21與所述旋轉鏡筒 1上之穿透式導向槽11配合。所述固定鏡筒2上之凸塊22 與所述旋轉鏡筒1上之内週槽12配合。 所述導向件4穿過穿透式導向槽11與穿透式直進槽 21與鏡片組3固接_。 請參閱圖3，為本發明圖2之鏡頭筒組裝示意圖。鏡 片組3容置於固定鏡筒2中，固定鏡筒2套設於旋轉鏡筒 1中。固定鏡筒2上之凸塊22通過旋轉鏡筒2上之穿透式 半開口入進槽13卡入所述旋轉鏡筒1之内週槽12中，使 旋轉鏡筒1不會相對固定鏡筒2在光軸00’方向移動。導 向件4穿過旋轉鏡筒1上之穿透式導向槽11、固定鏡筒2 上之穿透式直進槽21與鏡片組3固定連接。當有外力作用 於旋轉鏡筒1上時，旋轉鏡筒1帶動導向件4在穿透式導 9 200912416 向槽11中移動’同時’導向件4在固定鏡筒2之 進槽21中沿著光轴方向移動；因導向件4與鏡片^且3 固定相連’導向件4在絲方向之移動也帶動鏡片組 3沿著光軸方向移動，完成調焦。 在可變倍數之鏡頭筒中，一般會有多組鏡片存在，每 組鏡片均連接相應之—組導向件4。在本實施方式中，鏡 頭筒中有兩組則，與之㈣應之導向件4有兩組。因鏡 片組3在移料需要健穩定，所以在本實施方式中採取 二點固定方式，即每組導向件4中有三個導向件4。與導 向件4對應之所述旋轉鏡筒丨上之穿透式導向槽n和所述 固定鏡筒2上之穿透式直進槽21也分別有兩組，每組三個。 可以理解的是，也可以將所述内週槽12與所述凸塊 22位置互換，即：在固定鏡筒2之外表面設置凹槽，而在 旋轉鏡同1之内壁上設置凸塊，該凹槽與凸塊互相配合， 同樣也可使旋轉鏡筒1不會在光軸〇〇,方向相對固定鏡筒 2移動。 . 另外’還可以將所述旋轉鏡筒1上之内週槽12換成兩 條旋轉平行之凸肋，固定鏡筒2上之凸塊22與該凸肋互相 配合，同樣也可使旋轉鏡筒1不會在光軸〇〇,方向相對固 定鏡筒2移動。 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 200912416 蓋於以下申請專利範圍内。 ' 【圖式簡單說明】 - 圖1係習知鏡頭筒之組裝示意圖 圖2係本發明之較佳實施方式之鏡頭筒分解示意圖。 圖3係本發明之圖2所示的鏡頭筒組裝示意圖。 【主要元件符號說明】 旋轉鏡筒 1 穿透式導向槽 11 内週槽 12 穿透式半開口入進槽 13 固定鏡筒 2 穿透式直進槽 21 凸塊 22 鏡片組 3 導向件 4 變倍鏡筒 5 穿透式止動槽 51 止動螺絲 52 穿透式導向槽 53 導銷 54 固定鏡筒 6 穿透式直進槽 61 11200912416 Nine, the invention description: [Technical field to which the invention pertains] The invention provides a lens barrel, in particular, a lens barrel for use with a shirting device having a zoom system. [Prior Art] A zoom lens of a general projector includes a mirror and a lens group. The mirror !" has two barrels, one barrel is fixed on the projector, one mirror == fixed, doing - fixed angle rotation. Rotatable lens ΙΓ The mirror is the same as the lens barrel fixed on the projector. 2: The sleeve is outside the fixed tube. The lens set is housed in the fixed mirror~.曰刖 Fix the nir genus f. When the variator cylinder phase = mirror _ turn, the variator cylinder f and the fixed lens barrel are set to 111 on the optical axis of the lens group, so that the variator cylinder is only fixed around the fixed mirror The barrel rotates and the ground moves along the optical axis of the lens. ^ Can read the stomach v A pounds, the two must exist to make the zoom lens tube is not Λ:: two ΐ moving structure. At present, the prevention structure is ====!!, the stop groove is a penetrating groove, and the lens is fixed. ^ ° Again, the stop screw passes through the stop groove and the solid h is the same as k' so the variator cylinder slides in the opposite direction to the fixed barrel. The first axis of the W is placed in: Figure 2: The schematic diagram of the combination of the conventional lens barrel. The lens group is defined as "6 II I", and the solid lens barrel 6 is sleeved inside the zoom lens barrel 5. The solid mirror has a penetrating straight groove 61, and the square mouth of the penetrating straight groove is aligned with the optical axis direction of the lens group to the 200912416, and the zoom lens barrel 5 has a penetrating guide groove 53 and a transmissive type. Stop groove 51. The penetrating guide groove 53 on the variator cylinder 5 corresponds to the penetrating straight groove 61 on the fixed barrel 6. The direction of the penetrating stop groove 51 on the variable power lens barrel 5 is perpendicular to the optical axis direction of the lens group, and the penetrating stop groove 51 has a certain length, so that the angle of rotation of the variator cylinder 5 can be controlled. The stopper screw 52 is fixed to the fixed barrel 6 through the penetrating stopper groove 51 on the variator cylinder, so that the variator cylinder 5 does not move in the optical axis direction with respect to the fixed barrel 6. The guide pin 54 passes through the penetrating guide groove on the variator cylinder 5 and the penetrating straight groove 61 on the fixed barrel 6 to be fixed to the lens group in the fixed barrel 6. When the variator cylinder 5 is rotated by an external force, the guide pin 54 is moved in the transmissive guide groove 53 and simultaneously moved in the optical axis direction in the transmissive straight groove 61, so that the lens group inside is driven. The fixed lens barrel 6 moves in the direction of the optical axis to achieve the purpose of zooming. When actually assembled on the production assembly line, the set screws, the retaining groove, the guide pin, the straight groove, the guide groove and the lens group need to be closely matched to be assembled perfectly. This process requires careful assembly so that the requirements can be met. In many cases, assembly errors and rework are required, which is very likely to result in image quality and even lens retirement. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a lens cylinder that is easy to install to reduce the assembly rejection rate. A lens barrel includes a fixed lens barrel and a rotating lens barrel, and the fixed lens barrel can accommodate a lens group. The rotating lens barrel is rotatably sleeved outside the fixed lens barrel, and the fixed lens barrel and the rotating lens barrel are respectively provided with a limiting structure that can cooperate with each other, and the limiting structure is used to prevent the Rotating the barrel - axially offset relative to the fixed barrel. - the fixed lens barrel and the rotating lens barrel of the lens barrel according to the present invention are all provided with a finite structure, and the fixed lens barrel can cooperate with the rotating lens barrel through the limiting structure, and the limiting structure and the fixed lens barrel respectively The rotating lens barrel is integrally formed, and can be directly assembled during assembly. It does not require the use of additional components, which is simple and quick, reduces production time, relatively reduces production cost, and enhances the competitiveness of the manufacturer. In order to explain the present invention in more detail, the present invention will be further described with reference to the accompanying drawings. Embodiments Please refer to FIG. 2 , which is a schematic exploded view of a lens barrel according to an embodiment of the present invention. The lens barrel can be used for a conventional camera, a digital camera, a video camera, and also for a projector, which is used in the present embodiment in the projector. The lens barrel includes a rotating barrel 1, a fixed barrel 2, a lens group 3, and a guide 4. The rotating barrel 1 and the fixed barrel 2 have a hollow cylindrical shape. The fixed barrel 2 is fixed to a projector (not shown), and the rotating barrel 1 is sleeved outside the fixed barrel 2 and rotatable relative to the fixed barrel 2. The lens group 3 is housed in the fixed barrel 2. The guide member 4 is fixed to the lens group 3 through the fixed barrel 2 and the rotating barrel 1. The rotating lens barrel 1 is provided with a transmissive guiding slot, a transmissive semi-opening slot 13 and a limiting structure. In the embodiment, the limiting structure is disposed on the inner wall of the rotating barrel 1 Inner circumference groove 12. The penetrating guide groove 11 is disposed on a side wall of the rotating barrel 1, and 8200912416 is an elongated groove whose direction is inclined with respect to the optical axis direction 00' of the lens group 3. - The penetrating half opening into slot 13 is provided at one end - edge of the rotating barrel 1. The inner circumferential groove 12 is disposed at an inner wall of the rotating barrel 1 and at the same end as the penetrating half opening into the groove 13, and the inner circumferential groove 12 and the penetrating half opening inlet groove 13 communicate with each other. . The fixed lens barrel 2 is provided with a through-type straight groove 21 and a limiting structure. In the embodiment, the limiting structure is a bump 22. The penetrating straight groove 21 is disposed on a side wall of the fixed barrel 2, and is an elongated groove. The direction of the penetrating straight groove 21 is parallel to the optical axis OCT direction of the lens group 3. The bump 22 is disposed at one end of the fixed barrel 2, and is integrally formed with the fixed barrel 2. The penetrating straight groove 21 on the fixed barrel 2 is engaged with the penetrating guide groove 11 on the rotating barrel 1. The projection 22 on the fixed barrel 2 is engaged with the inner circumferential groove 12 on the rotating barrel 1. The guide member 4 is fixed to the lens group 3 through the penetrating guide groove 11 and the penetrating straight groove 21. Please refer to FIG. 3 , which is a schematic view showing the assembly of the lens barrel of FIG. 2 of the present invention. The lens group 3 is housed in the fixed barrel 2, and the fixed barrel 2 is sleeved in the rotating barrel 1. The projection 22 on the fixed barrel 2 is inserted into the inner circumferential groove 12 of the rotating barrel 1 by the penetrating half opening into the groove 13 on the rotating barrel 2, so that the rotating barrel 1 does not face the fixed mirror The barrel 2 moves in the direction of the optical axis 00'. The guide member 4 is fixedly coupled to the lens group 3 through the penetrating guide groove 11 on the rotating barrel 1, and the penetrating straight groove 21 on the fixed barrel 2. When an external force acts on the rotating barrel 1, the rotating barrel 1 drives the guiding member 4 to move in the slot 11 in the transmissive guide 9 200912416 while the guiding member 4 is in the slot 21 of the fixed barrel 2 along The direction of the optical axis moves; because the guiding member 4 is fixedly connected with the lens ^3, the movement of the guiding member 4 in the direction of the wire also drives the lens group 3 to move along the optical axis direction to complete the focusing. In a variable magnification lens barrel, there are typically multiple sets of lenses, each of which is coupled to a corresponding set of guides 4. In the present embodiment, there are two groups in the lens barrel, and there are two groups of guide members 4 corresponding thereto. Since the lens group 3 needs to be stable and stable in the material transfer, in the present embodiment, a two-point fixing method is adopted, that is, three guide members 4 are arranged in each group of the guide members 4. The penetrating guide groove n on the rotating barrel corresponding to the guide member 4 and the penetrating straight groove 21 on the fixed barrel 2 are also respectively provided in two groups of three. It can be understood that the position of the inner circumferential groove 12 and the protrusion 22 can also be interchanged, that is, a groove is provided on the outer surface of the fixed barrel 2, and a convex piece is arranged on the inner wall of the rotating mirror. The groove and the projection cooperate with each other, and the rotating barrel 1 can also be moved in the direction opposite to the fixed barrel 2 without being in the optical axis. In addition, the inner circumferential groove 12 on the rotating lens barrel 1 can be replaced by two rotating parallel ribs, and the convex block 22 on the fixed lens barrel 2 can cooperate with the convex rib, and the rotating mirror can also be rotated. The cylinder 1 does not move in the direction of the optical axis, and is relatively fixed in the direction of the fixed barrel 2. In summary, the invention conforms to the patent requirements of the invention, and the patent application is filed according to law. However, the above description is only a 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 variations in accordance with the spirit of the present invention. Ying Han 200912416 is covered by the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the assembly of a lens barrel according to a preferred embodiment of the present invention. 3 is a schematic view showing the assembly of the lens barrel shown in FIG. 2 of the present invention. [Main component symbol description] Rotating lens barrel 1 Transmissive guide groove 11 Inner circumferential groove 12 Transmissive semi-opening into groove 13 Fixed lens barrel 2 Penetrating straight groove 21 Bump 22 Lens group 3 Guide member 4 zoom Lens barrel 5 penetrating stop groove 51 stop screw 52 penetrating guide groove 53 guide pin 54 fixed barrel 6 penetrating straight groove 61 11