M318729 八、新型說明： 【新型所屬之技術領域】 本新型是有關於一種鏡頭裝置，且特別是有關於一種 具有限制調焦位置功能之鏡頭裝置。 【先前技術】 請參照第1圖以及第2圖，第！圖係繪示現有鏡頭裝 置之立體組合圖；第2圖係繪示現有鏡頭裝置之立體分解 圖。現有的鏡頭裝置（如應用於投影機上的鏡頭裝置）包含 一則群框100、一固定座2〇〇以及一後群框3〇〇，其中前 群框100以及後群框300係設於固定座2〇〇相反之兩端部。 前群框100上包含一第一周面11〇，第一周面11〇為 一外周面並具有一外螺紋115;固定座2〇〇包含一第二周 面210’第一周面210為一内周面並具有一内螺紋215。 藉由第一周面110上外螺紋115與第二周面21〇上内螺紋 215相互囉合之設計，使前群框1〇〇與固定座可做相 對旋轉之動作，而於前群框1〇〇與固定座2〇〇間產生相對 軸向位移。藉此前群框1〇〇沿固定座2〇〇呈轴向地移動可 _整鏡頭之焦距。其中外螺紋115以及内螺紋215可採用 二線或六線螺紋之設計方式。 此外’為限制前群框100調焦之位移量，前群框1 〇〇 與固定座200上會設有一限位裝置。此限位裝置包含設於 固定座200上的限位缺口 26〇以及設於前群框1〇〇上的定 位螺絲150。限位缺口 26〇透過加工處理（如銑床）製作。 M318729 =螺絲15G鎖附於前群框⑽上，使其移動範圍限制於 ，缺口細之角度内。藉此，限位裝置限制了前群框100 _定座2〇0間相對旋轉之角度，達到限制前群框100與 固疋座200間相對軸向位移之範圍。 後群框300係利用溝槽固定之方式設於固定座200 上，固定座綱上開設有三個溝槽29〇，並於後群框· 上设有二個與溝槽290位置對應之螺絲35〇，並使該螺絲 〇於溝槽29G内移動’藉此使後群框細可相對於固定 座200軸向移動用以調整鏡頭之倍率。 現有鏡頭裝置在設計前群框丨⑻與@定座·相互配 合之螺紋時，A 了避免無法調焦之情形產生，因此不僅要 考慮螺紋旋轉之角度與軸向移動的距離，更要考量到定位 螺絲150和螺紋起始位置之相對關係。前群框ι〇〇對準組 入於，定座200時，因設計是採三線或六線螺紋之方式以 致於每次組入之位置可能並非為最佳調焦範圍，若鏡頭解 像不佳時須再鬆開定位螺絲15〇並將鏡頭拆開後再以另一 角度將前群框100旋入固定座2〇〇，在獲得最佳調焦之範 圍之後再鎖附上定位螺絲15〇來限制前群調焦之位移量。 如此一來，前群框100與固定座200組裝後若定位螺 絲150之控制行程並未在最佳調焦範圍内時，還需再進行 重新對準之步驟，此繁複之對準步驟將耗費組立工時。 因此’如何透過改良限位裝置以獲得一較佳之調焦方 式’避免鏡頭重新對準之步驟以縮短組立工時，即成為研 發没計之方向。 M318729 【新型内容] 因此本新型的目的在提供一種鏡頭裝置，藉由改良限 位裝置來限制調焦之範圍，省去現有鏡頭裝置於重新對準 組立用以獲得最佳調焦範圍之步驟。 根據本新型之一種鏡頭裝置，包含基座、第一群框以 及限位裝置。基座包含一具有第一開口之固定座，其中固 定座具有一環周面。第一群框係設於第一開口上，且可沿 著固定座呈軸向地移動用以調整鏡頭之焦距。 限位裝置包含擋止元件以及兩限位元件，其中擋止元 件係没於第一群框上，且該組限位元件係設於固定座之環 周面上。擋止元件係為一片狀體，延伸至固定座之環周面 上’並利用鎖接元件如螺絲鎖接於第一群框上。該組限位 元件係為一柱狀體（如螺絲或螺栓），且具有一端部位於限 位元件之間。 藉此，第一群框與固定座作相對軸向運動時，設於第 一群框上之擋止元件係活動於固定座環周面上之該組限 位7G件之間用以限制該鏡頭裝置之調焦範圍。因此鏡頭調 焦設計上係在第一群框與固定座藉由螺紋鍥合組裝對準 後，在預定的最佳調焦範圍内於環周面上設置限位元件用 以界定出行程範圍，再於第一群框上鎖附擋止元件使其限 位於由限位元件所界定出行程範圍内，達到限制調焦之角 度以及範圍。 因此，本新型之鏡頭裝置具有下列之功效： 7 M318729 ι·本新型之鏡頭裝置，藉由改良限位裝置來限制調焦 之範圍，省去現有鏡頭裝置於重新對準組立用以獲得最佳 調焦範圍之步驟。 2·本新型之鏡頭裝置，相較於現有鏡頭裝置，可減少 於固定座上銑出一角度缺口之製程，進而節省加工成本。 3.本新型之鏡頭裝置由於不需在固定座上銑出一角度 缺口，相較於本新型中裝設於固定座之第一環周面上之限 位元件，可縮短固定座之長度，因此整體鏡頭裝置所佔之 體積亦可減少，更符合小鏡頭之需求。 【實施方式】 明參妝苐3圖以及第4圖，第3圖係緣示本新型實施 例鏡頭裝置之立體組合圖，第4圖係纟會示本新型實施例鏡 頭裝置之立體分解圖。本實施例之鏡頭裝置包含一基座 500、一第一群框600以及一限位裝置700。基座5〇〇包含 一固定座510以及一第二群框560，其中固定座510包含 没於固疋座510兩端部之一第一開口 511以及一第二開口 516。第一群框600係設於固定座510之第一開口 511，而 第二群框560係設於固定座510之第二開口 516。 固定座510更包含一第一環周面513以及一第二環周 面514’其中第一環周面513為一外周面，第二環周面514 為一内周面。第二環周面514具有一母螺紋5145。第一群 框600包含一第三環周面610,第三環周面610為一外周 面並具有一公螺紋615。公螺紋615相互餐合於該第二環 M318729 周面514之母螺紋5145，藉由第一群框6〇〇以及固定座 510上相互鍥合之螺紋設計（三線螺紋設計或六線螺紋設 汁，本實施例以六線螺紋設計做為說明）使第一群框6〇〇 與固定座510可做相對旋轉之動作，因此第一群框6〇〇可 /口著固定座510作軸向之移動用以調整鏡頭之焦距。 第一群框560係可利用溝槽固定之方式設於固定座 510上，固定座510上開設有三個溝槽515，並於第二群 框560上设有二個與溝槽515位置對應之螺絲565，並使 该螺絲565於固定座51〇之溝槽515内移動，藉此使第二 群框560可相對於固定座51〇軸向移動用以調整鏡頭之倍 率0 限位裝置700包含一擋止元件71〇以及兩限位元件 760，其中擋止元件71〇係設於第一群框6〇〇上，且該組 限位元件760係設於固定座51〇之第一環周面513上。擋 止元件710係為一片狀體，並利用鎖接元件如螺絲鎖接於 第一群框600上，且延伸至固定座51〇之第一環周面513 上使其一端部位於限位元件760之間。該組限位元件76〇 係為柱狀體，本實施例中係為兩個鎖於第一環周面5 j 3 上之螺絲（亦可一體成型於第一環周面5丨3上）。 藉此，本實施例中第一群框6〇〇與固定座51〇作相對 軸向運動時，6又於第一群框6〇〇上之播止元件片狀體） 係活動於固定座510第一環周面513上之該組限位元件 760(螺絲）之間用以限制該鏡頭裝置之調焦範圍。因此鏡頭 調焦設計上係在第一群框600與固定座51〇藉由螺紋嚅合 9 M318729 組裝對準後，在預定的最佳調焦範圍内於第一環周面513 上没置限位元件760用以界定出行程範圍，再於第一群框 600上鎖附擋止元件7丨〇使其限位於由限位元件76〇所界 疋出行程範圍内，達到限制調焦之角度以及範圍。 由上述可知，本新型之鏡頭裝置具有以下之功效： 1·本新型之鏡頭裝置，藉由改良限位裝置7〇〇來限制 調焦之範圍，省去現有鏡頭裝置於重新對準組立用以獲得 最佳調焦範圍之步驟。 2·本新型之鏡頭裝置，相較於現有鏡頭裝置，可減少 於固定座510上銑出一角度缺口之製程，進而節省加工成 ° 3·本新型之鏡頭裝置由於不需在固定座510上銑出一 角度缺口，相較於本新型中裝設於固定座510之第一環周 面513上之限位元件76〇，可縮短固定座51〇之長度，因 此整體鏡頭裝置所佔之體積亦可減少，更符合小鏡頭之需 求。 雖然本新型已以一實施例揭露如上，然其並非用以限 疋本新型，任何熟習此技藝者，在不脫離本新型之精神和 摩巳圍内，當可作各種之更動與潤飾，因此本新型之保護範 圍當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 ^為讓本新型之上述和其他目的、特徵、優點與實施例 能更明顯易懂，所附圖式之詳細說明如下： M318729 第1圖係依照現有鏡頭裝置之立體組合圖。 第2圖係依照現有鏡頭裝置之立體分解圖。 第3圖係依照本新型實施例鏡頭裝置之立體組合圖 第4圖係依照本新型實施例鏡頭裝置之立體分解圖 【主要元件符號說明】 100 :前群框 110 ： 第一周面 Π5 :公螺紋 150 ： 定位螺絲 200 :固定座 210 ： 第二周面 215 :母螺紋 260 ： 缺口 3〇〇 :後群框 350 ： 螺絲 500 :基座 510 ： 固定座 511 :第一開口 513 ： 第一環周面 514 :第二環周面 5145 :母螺紋 515 :溝槽 516 ： 第一開口 560 :第二群框 565 ： 螺絲 600 :第一群框 610 ： 第三環周面 615 :公螺紋 700 ： 限位裝置 71 〇 :擋止元件 760 ： 限位元件 11M318729 VIII. New description: [New technical field] The present invention relates to a lens device, and in particular to a lens device having a function of limiting a focus position. [Prior Art] Please refer to Figure 1 and Figure 2, page! The figure shows a three-dimensional combination diagram of the existing lens device; the second figure shows an exploded perspective view of the existing lens device. The existing lens device (such as a lens device applied to a projector) includes a group frame 100, a fixed seat 2〇〇, and a rear group frame 3〇〇, wherein the front group frame 100 and the rear group frame 300 are fixed. The two sides of the seat are opposite ends. The front group frame 100 includes a first circumferential surface 11〇, the first circumferential surface 11〇 is an outer circumferential surface and has an external thread 115; the fixing base 2〇〇 includes a second circumferential surface 210′. The first circumferential surface 210 is An inner peripheral surface has an internal thread 215. By the design of the external thread 115 on the first circumferential surface 110 and the internal thread 215 on the second circumferential surface 21, the front frame 1〇〇 and the fixed seat can be rotated relative to each other, and the front group frame 1 产生 and the fixed seat 2 产生 between the relative axial displacement. Thereby, the front group frame 1 〇〇 axially moves along the fixed seat 2〇〇 to adjust the focal length of the lens. The external thread 115 and the internal thread 215 can be designed in two or six threads. In addition, in order to limit the amount of displacement of the front group frame 100, a limit device is disposed on the front group frame 1 and the fixed base 200. The limiting device includes a limiting notch 26〇 disposed on the fixing base 200 and a positioning screw 150 disposed on the front frame 1〇〇. Limit notch 26〇 is produced by machining (such as milling machine). M318729 = Screw 15G lock is attached to the front group frame (10), so that the movement range is limited to the angle of the notch. Thereby, the limiting device limits the relative rotation angle between the front group frame 100 and the fixed seat 2〇0, and reaches a range of limiting the relative axial displacement between the front group frame 100 and the fixed seat 200. The rear group frame 300 is fixed on the fixing base 200 by means of a groove fixing. The fixing seat is provided with three grooves 29〇, and the rear group frame is provided with two screws 35 corresponding to the position of the groove 290. 〇, and the screw is moved in the groove 29G', thereby making the rear group frame finely movable relative to the fixed seat 200 for adjusting the magnification of the lens. In the existing lens device, when designing the front frame 丨(8) and the @fixing and matching thread, A avoids the situation that the focus cannot be adjusted. Therefore, it is necessary to consider not only the angle of the rotation of the thread but also the distance of the axial movement. The relative relationship between the set screw 150 and the starting position of the thread. The front group box is aligned with the group. When the seat is set to 200, the design is based on the three- or six-thread thread, so that the position of each group may not be the best focus range, if the lens resolution is not When you need to loosen the set screw 15〇 and disassemble the lens, then screw the front group frame 100 into the fixed seat 2〇〇 at another angle, and then lock the positioning screw 15 after obtaining the best focus range. 〇 to limit the amount of displacement of the front group focus. In this way, if the control stroke of the positioning screw 150 is not within the optimal focus range after the front group frame 100 is assembled with the fixing base 200, the realignment step needs to be performed again, and the complicated alignment step will be costly. Set up working hours. Therefore, 'how to improve the limit device to obtain a better focus mode' avoids the step of realigning the lens to shorten the group work time, which is the direction of research and development. M318729 [New content] Therefore, the object of the present invention is to provide a lens device which limits the range of focusing by improving the limiting device, and eliminates the step of re-aligning the existing lens device for obtaining the optimum focusing range. A lens device according to the present invention includes a base, a first group of frames, and a limit device. The base includes a mount having a first opening, wherein the mount has a circumferential surface. The first group of frames is disposed on the first opening and is axially movable along the fixed seat to adjust the focal length of the lens. The limiting device comprises a blocking element and two limiting elements, wherein the blocking element is not on the first group frame, and the set of limiting elements is disposed on the circumferential surface of the fixing seat. The stop member is a piece-like body that extends to the circumferential surface of the fixed seat and is locked to the first group frame by a locking member such as a screw. The set of limiting elements is a columnar body (such as a screw or bolt) and has one end located between the limiting elements. Thereby, when the first group frame and the fixed seat move relative to each other, the blocking elements disposed on the first group frame are movable between the set of 7G members on the circumferential surface of the fixed seat ring to limit the The focus range of the lens unit. Therefore, the lens focusing design is arranged in the first group frame and the fixing base by threading assembly, and a limiting component is arranged on the circumferential surface in a predetermined optimal focusing range to define a stroke range. Then, the blocking component is locked on the first group frame so as to be limited to the stroke range defined by the limiting component, and the angle and range of the focusing adjustment are limited. Therefore, the lens device of the present invention has the following effects: 7 M318729 ι· The lens device of the present invention limits the range of focusing by improving the limit device, and omits the existing lens device for realigning the group for optimal use. The step of focusing the range. 2. The lens device of the present invention can reduce the process of milling an angle gap on the fixed seat compared with the existing lens device, thereby saving processing cost. 3. The lens device of the present invention can shorten the length of the fixing seat by eliminating the need for an angle notch on the fixing seat, compared with the limiting component mounted on the first circumferential surface of the fixing seat of the present invention. Therefore, the volume of the overall lens device can also be reduced, which is more in line with the needs of small lenses. [Embodiment] FIG. 3 and FIG. 4 and FIG. 3 are perspective sectional views of the lens device of the present embodiment, and FIG. 4 is a perspective exploded view of the lens device of the present invention. The lens device of this embodiment includes a base 500, a first group frame 600, and a limiting device 700. The base 5 includes a fixing base 510 and a second group frame 560. The fixing base 510 includes a first opening 511 and a second opening 516 which are not at both ends of the fixing base 510. The first group frame 600 is disposed at the first opening 511 of the fixing base 510, and the second group frame 560 is disposed at the second opening 516 of the fixing base 510. The fixing base 510 further includes a first circumferential surface 513 and a second circumferential surface 514'. The first circumferential surface 513 is an outer circumferential surface, and the second circumferential surface 514 is an inner circumferential surface. The second circumferential surface 514 has a female thread 5145. The first group of frames 600 includes a third circumferential surface 610 that is an outer circumferential surface and has a male thread 615. The male threads 615 are mutually spliced to the female thread 5145 of the circumferential surface 514 of the second ring M318729, and the threaded design of the first group frame 6〇〇 and the fixing seat 510 is matched with each other (three-thread thread design or six-thread thread design) In this embodiment, the six-thread thread design is used as an illustration. The first group frame 6 〇〇 and the fixed seat 510 can be rotated relative to each other. Therefore, the first group frame 6 can be connected to the fixed seat 510 for axial direction. The movement is used to adjust the focal length of the lens. The first group of frames 560 can be disposed on the fixing base 510 by means of the groove fixing. The fixing seat 510 is provided with three grooves 515, and the second group frame 560 is provided with two positions corresponding to the grooves 515. The screw 565 moves the screw 565 in the groove 515 of the fixing base 51, thereby moving the second group frame 560 axially relative to the fixing base 51 to adjust the magnification of the lens. The limit device 700 includes a blocking element 71〇 and two limiting elements 760, wherein the blocking element 71 is disposed on the first group frame 6〇〇, and the group of limiting elements 760 is disposed on the first circumference of the fixing seat 51〇 Face 513. The stopping member 710 is a one-piece body and is locked to the first group frame 600 by a locking member such as a screw, and extends to the first circumferential surface 513 of the fixing seat 51〇 so that one end thereof is at the limit position. Between elements 760. The set of the limiting members 76 is a columnar body. In this embodiment, the two screws are locked on the first circumferential surface 5 j 3 (may also be integrally formed on the first circumferential surface 5丨3) . Therefore, in the embodiment, when the first group frame 6〇〇 and the fixing base 51 are moved in the relative axial direction, the blocking element of the first group frame 6〇〇 is moved to the fixed seat. The set of limiting members 760 (screws) on the first circumferential surface 513 of the 510 is used to limit the focusing range of the lens device. Therefore, the lens focusing design is arranged on the first ring circumferential surface 513 within the predetermined optimal focusing range after the first group frame 600 and the fixing base 51 are assembled by the thread clamping 9 M318729. The positional component 760 is used to define the range of travel, and the blocking component 7 is locked on the first group frame 600 so as to be limited to the range of the stroke defined by the limiting component 76, to limit the focus. And scope. It can be seen from the above that the lens device of the present invention has the following effects: 1. The lens device of the present invention limits the range of focusing by improving the limiting device 7〇〇, and omits the existing lens device for realigning the assembly. The step to get the best focus range. 2. The lens device of the present invention can reduce the process of milling an angle notch on the fixing base 510 compared with the existing lens device, thereby saving processing into a lens. 3. The lens device of the present invention does not need to be on the fixing base 510. By milling an angle notch, the length of the fixing base 51〇 can be shortened compared with the limiting element 76〇 mounted on the first circumferential surface 513 of the fixing base 510 of the present invention, so the volume occupied by the integral lens device Can also be reduced, more in line with the needs of small lenses. Although the present invention has been disclosed in an embodiment as described above, it is not intended to limit the present invention, and any person skilled in the art can make various changes and retouchings without departing from the spirit and scope of the present invention. The scope of protection of this new type is subject to the definition of the scope of the patent application. BRIEF DESCRIPTION OF THE DRAWINGS In order to make the above and other objects, features, advantages and embodiments of the present invention more obvious, the detailed description of the drawings is as follows: M318729 Fig. 1 is a three-dimensional combination according to the existing lens device. Figure. Fig. 2 is an exploded perspective view of a conventional lens device. 3 is a perspective view of a lens device according to an embodiment of the present invention. FIG. 4 is an exploded perspective view of a lens device according to an embodiment of the present invention. [Main component symbol description] 100: Front group frame 110: First circumferential surface Π 5: Male Thread 150 : Locating screw 200 : Mounting seat 210 : Second circumferential surface 215 : Female thread 260 : Notch 3 〇〇 : Rear group frame 350 : Screw 500 : Base 510 : Mounting seat 511 : First opening 513 : First ring The circumferential surface 514: the second circumferential surface 5145: the female thread 515: the groove 516: the first opening 560: the second group frame 565: the screw 600: the first group frame 610: the third circumferential surface 615: the male thread 700: Limiting device 71 〇: blocking element 760 : limiting element 11