200841115 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種投影鏡頭，特別是指一種具有遮 光元件的投影鏡頭。 【先前技術】 圖1為習知一種具有遮光元件的投影鏡頭1的側視剖 視圖，該具有遮光元件的投影鏡頭1是包含一固定筒11、 一迴轉筒12、一第一鏡室單元13以及一第二鏡室單元14 。該固定筒11包括一圍繞界定出一内孔113的筒壁lu， 以及一自該筒壁111 一端沿徑向朝内延伸的限位環丨12，該 迴轉筒12是套設於該筒壁1丨丨外。該第一鏡室單元13包括 一套設在該筒壁111内孔113的鏡筒131、設置於該鏡筒 131内的多數片鏡片132與一遮光元件133、三個穿過該固 定筒11與迴轉筒12並設置於該鏡筒13ι外周面的導引件 134 (圖中只顯示一個），以及三個固定該遮光元件133的 鎖緊螺絲135 (圖中只顯示一個），該第二鏡室單元μ穿設 於該固定筒11遠離該第一鏡室單元13的一端。 參閱圖2，是另一表現分解的側視剖視圖，該埠光元件 133即為業界俗稱的貓眼結構，可以用於增加該投影機（圖 未不）投射亮度的對比值，當欲更換或維修該遮光元件133 時’須依序經過以下步驟：自該固定筒丨丨取下第二鏡室單 70 14、將該導引件134自該鏡筒131取下、自該内孔113 將該第一鏡室單元13取出、自該鏡筒131取下該等鏡片 132、自該鏡筒131拆掉該鎖緊螺絲135，最後才能將該遮 5 200841115 ==133取出。因為該限位環ιι2檔住了該鏡筒η 專…2也擔住了該遮光元件133，使取下該遮光元： 33的步驟繁;貞’導致有維料㈣缺失。 【發明内容】 因此本發明之目的，即在提供_種維修容易的 遮光元件的投影鏡頭。 ’、有200841115 IX. Description of the Invention: [Technical Field] The present invention relates to a projection lens, and more particularly to a projection lens having a light shielding element. 1 is a side cross-sectional view of a projection lens 1 having a light shielding element, which includes a fixed cylinder 11, a rotary cylinder 12, a first mirror unit 13, and A second mirror unit 14 . The fixing cylinder 11 includes a cylinder wall lu defining an inner hole 113, and a limiting ring 12 extending radially inward from an end of the cylinder wall 111. The rotating cylinder 12 is sleeved on the cylinder wall. 1 丨丨 outside. The first mirror unit unit 13 includes a lens barrel 131 disposed in the inner hole 113 of the cylinder wall 111, a plurality of lens pieces 132 disposed in the lens barrel 131 and a light shielding member 133, and three through the fixed cylinder 11 a guiding member 134 (only one shown in the figure) is disposed on the outer circumferential surface of the lens barrel 131, and three locking screws 135 (only one is shown) for fixing the light shielding member 133, the second The mirror chamber unit μ is disposed at an end of the fixed cylinder 11 away from the first mirror chamber unit 13. Referring to FIG. 2, it is a side cross-sectional view showing another exploded view. The calendering element 133 is a cat eye structure commonly known in the industry, and can be used to increase the contrast value of the projection brightness of the projector (not shown) when it is to be replaced or repaired. The light-shielding element 133 is required to sequentially follow the steps of: removing the second mirror chamber unit 70 14 from the fixed cylinder, removing the guiding member 134 from the lens barrel 131, and removing the guiding member 134 from the inner hole 113 The first mirror unit 13 is taken out, the lenses 132 are removed from the lens barrel 131, the locking screws 135 are removed from the lens barrel 131, and finally the cover 5 200841115 == 133 is taken out. Because the limit ring ιι2 holds the lens barrel η 2 also holds the shading element 133, so that the step of removing the shading element: 33 is complicated; 贞' causes the missing material (4) to be missing. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a projection lens of a light-shielding element that is easy to maintain. ',Have
^於是，本發明具有遮光元件的投影鏡頭是包含一固定 筒、-迴轉筒以及一第一鏡室單元。„定筒包括一沿： 軸向延伸且圍繞界定出一内孔的筒壁，該筒壁具有多數導 溝。该迴轉冑是可旋轉地套言交於該冑壁外，並包括多數第 凸輪溝。δ亥第一鏡室單元包括一套設在該筒壁内孔的第 一鏡筒，以及設置於該第一鏡筒内的一第一鏡群與一遮光 兀件。該第-鏡筒具有一保持在該固定筒之内孔中的内移 環、多數設置於該内移環外周面且分別穿伸於該等第一凸 輪溝與導溝的第-導引件，及—可拆卸地連接於該内移環 的一外端的外筒體。該遮光元件是設置於該外筒體内。當 該外筒體與内移環分離時，可移出該筒壁之内孔。 本發明具有遮光元件的投影鏡頭的功效在於該外筒體 了直接與内移環分離而拆下該遮光元件，使維修更加容易 〇 【實施方式】 有關本發明之前述及其他技術内容、特點與功效，在 以下配合參考圖式之一個較佳實施例的詳細說明中，將可 清楚的呈現。 6 200841115 參閱圖3與圖4,為本發明具有遮光元件的投影鏡頭之 較佳實施例的一側視剖視圖與一前視剖視圖，該具有遮光 元件的投影鏡頭包含一固定筒3、一迴轉筒4、一第一鏡室 單元5以及一第二鏡室單元6。 該固定筒3包括一沿一轴向1延伸且圍繞界定出一内 孔313的筒壁31，以及一自該筒壁31 一端沿徑向朝外延伸 的安裝板32。該筒壁3 1具有三條導溝3丨丨，以及三條第二 凸輪溝312。該安裝板32是供該投影鏡頭鎖固於一投影機 之機殼（圖未示）用。該迴轉筒4是可旋轉地套設於該筒壁 31外，並包括三條第一凸輪溝41。因剖視角度之關係，在 圖3中僅顯示一導溝311、一第一凸輪溝41，及一第二凸輪 溝312，合先敘明，以下相似之數量敘述亦同。 該第一鏡室單元5具有變焦功能，並包括一套設在該 筒壁31内孔313的第一鏡筒51,以及設置於該第一鏡筒 Η内的一第一鏡群52與一遮光元件53。 該第一鏡筒51具有一保持在該内孔313中的内移環 5U、三個設置於該内移環511外周面且分別穿伸於該等第 —凸輪溝41與導溝311的第一導引件512、一可拆卸地連 接於該内移環511的一外端的外筒體513、三根固定螺絲 W ’及二根沿徑向穿過該外筒體η)的鎖緊螺絲515，該 内移％ 511具有一抵靠面516。 該固疋筒3的内孔313的内徑D1大於該外筒體513的 —大外抆D2 (如圖5所示），該外筒體513具有相反的一内 端部517盘一冰細_ /、 卜％ 518，以及一自該内端部517外周面沿 7 200841115 徑向朝外延伸的擋環519。該内移環511的抵靠面516與該 擋環519相對，該等固定螺絲514沿軸向將該擋環519螺 鎖於該抵罪面516，當該外筒體513與内移環511分離時， 可移出該筒壁31之内孔313。 ，該第一鏡室單S 5㈣一鏡群52具有二片設置於該内 移環511的内鏡片521，以及五片設置於該外筒體513内的 外鏡片522。該遮光元件53是設置於該外筒體513内，並 位於忒0夕卜鏡片521、522之間，且具有一設置於該外筒 體513之内周面的固定環53丨、一自該固定環1沿徑向 朝内延伸的遮光片532,以及-由該固定$ 531及遮光片 532所包圍界定的通光孔533,該等鎖緊螺絲515是沿徑向 穿過該外筒體513，且鎖固於該固定環53卜以將該遮光元 件53固定。 該第二鏡室單元6具有對焦功能，並相反於該第一鏡 室單元5,且安裝於該固定筒3之筒壁m，該第二鏡室單 疋6包括-可沿該軸向I移動的第二鏡筒61，以及一設置 於該第二鏡筒61内的第二鏡群62。該第二鏡筒61是可旋 轉並沿軸向！移動地套設在該筒壁31的内孔313中，且且 有三個沿徑向凸出且分別穿伸於該固定筒3的該等第二凸 輪溝312的第二導引件611。 參閱圖5’為另—表現分解的側視剖視圖，當欲更換或 ^該遮光元件53時’須依序經過以下步驟：自該撞環 519取下該等固定螺衅 513 ό ^ ......自該内孔313取出該外筒體 3、自該外筒體513取下該等鎖緊螺絲⑴，即可將該遮 8 200841115 光元件53取出。 本發明具有遮光元件的投影鏡頭的内孔313的内秤〇ι 大於該外筒體513的最大外徑D2，且不須拆卸該第二鏡室 單元6、該第-導引件512、該第—鏡筒51與該等内鏡片 521就可以取下該遮光元件53，較習知步驟精簡許多，可 以使得維修更加簡單有效率。 值得一提的是除了該較佳實施例利用該等固定螺絲514 將該外筒體513螺鎖於該内移環511之外，本發明具有遮光 元件的投影鏡頭還能利用分別在該内移環511與外筒體513 設置相互配合螺鎖在一起的螺紋，或是其它可以將該外筒 體513可拆卸地安裝於該内移環511上的等效方式，皆可以 使該具有遮光元件的投影鏡頭達到上述的功效。 惟以上所述者’僅為本發明之較佳實施例而已，當不 能以此限定本發明實施之範圍，即大凡依本發明申請專利 範圍及發明說明内容所作之簡單的等效變化與修飾，皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖1是一側視剖視圖，說明習知一種具有遮光元件的 投影鏡頭； 圖2是一類似圖1的視圖，說明取下一遮光元件所須 分解之構件； 圖3是一側視剖視圖，說明本發明具有遮光元件的投 影鏡頭的一較佳實施例； 圖4是一由圖3中IV - IV割面線所取的前視剖視圖， 200841115 說明三根固定螺絲與三根鎖緊螺絲的安裝位置；及 圖5是是一類似圖3的視圖，說明取下一遮光元件所 須分解之構件。Thus, the projection lens of the present invention having a light shielding member comprises a fixed cylinder, a rotary cylinder and a first mirror chamber unit. The cylinder includes an axially extending wall surrounding the cylinder defining an inner bore having a plurality of guide channels. The rotary jaw is rotatably disposed outside the wall and includes a plurality of cams The first mirror unit of the δ hai includes a first lens barrel disposed in the inner hole of the tube wall, and a first mirror group and a light shielding element disposed in the first lens barrel. The first mirror The cylinder has an inner shifting ring held in the inner hole of the fixed cylinder, a plurality of first guiding members disposed on the outer peripheral surface of the inner moving ring and respectively extending through the first cam groove and the guiding groove, and The outer cylinder is detachably connected to an outer end of the inner movement ring. The shading element is disposed in the outer cylinder. When the outer cylinder is separated from the inner movement ring, the inner hole of the cylinder wall can be removed. The invention has the advantages that the projection lens having the light shielding element has the effect that the outer cylinder is directly separated from the inner movement ring to remove the light shielding element, thereby making maintenance easier. [Embodiment] The foregoing and other technical contents, features and effects of the present invention are related to the present invention. In the following, a detailed description of a preferred embodiment of the reference drawings is provided. 6 200841115 Referring to FIG. 3 and FIG. 4, a side cross-sectional view and a front cross-sectional view of a preferred embodiment of a projection lens having a shading element according to the present invention, the projection lens having the shading element includes a fixed cylinder 3, a rotary cylinder 4, a first mirror chamber unit 5 and a second mirror chamber unit 6. The fixed cylinder 3 includes a cylinder wall 31 extending along an axial direction 1 and surrounding an inner bore 313. And a mounting plate 32 extending radially outward from one end of the tubular wall 31. The tubular wall 31 has three guiding grooves 3丨丨 and three second cam grooves 312. The mounting plate 32 is for the projection lens The casing is locked to a casing (not shown) of the projector. The rotary cylinder 4 is rotatably sleeved outside the cylinder wall 31 and includes three first cam grooves 41. Due to the angle of the cross section, Only one guide groove 311, a first cam groove 41, and a second cam groove 312 are shown in FIG. 3, which will be described in the following. The same number of descriptions are the same. The first mirror unit 5 has a zoom function, and a first lens barrel 51 disposed in the inner hole 313 of the cylinder wall 31, and disposed on the first a first mirror group 52 and a light blocking member 53 in the cartridge. The first lens barrel 51 has an inner shifting ring 5U held in the inner hole 313, three outer peripheral surfaces of the inner shifting ring 511 and respectively a first guiding member 512 extending through the first cam groove 41 and the guiding groove 311, an outer cylinder 513 detachably connected to an outer end of the inner moving ring 511, three fixing screws W' and two a locking screw 515 that passes through the outer cylinder η) in the radial direction, the internal displacement % 511 has an abutting surface 516. The inner diameter D1 of the inner hole 313 of the fixing cylinder 3 is larger than that of the outer cylinder 513 The outer outer casing D2 (shown in FIG. 5) has an inner end 517 having an opposite inner end 517, an ice thin _ /, a y% 518, and an inner peripheral surface 517 from the outer peripheral surface along the 7 200841115 diameter. A retaining ring 519 that extends outward. The abutting surface 516 of the inner shifting ring 511 is opposite to the retaining ring 519. The fixing screws 514 axially lock the retaining ring 519 to the sinus surface 516 when the outer cylinder 513 is separated from the inner shifting ring 511. At the time, the inner hole 313 of the barrel wall 31 can be removed. The first mirror unit S 5 (four) mirror group 52 has two inner lenses 521 disposed on the inner ring 511 and five outer lenses 522 disposed in the outer cylinder 513. The light shielding member 53 is disposed in the outer cylinder 513 and located between the 520 lenses 521 and 522, and has a fixing ring 53 设置 disposed on the inner circumferential surface of the outer cylinder 513. a light blocking piece 532 extending radially inwardly of the fixing ring 1 and a light passing hole 533 defined by the fixing $531 and the light shielding piece 532, the locking screws 515 are radially passed through the outer cylinder 513, and is locked to the fixing ring 53 to fix the shading member 53. The second mirror unit 6 has a focusing function, and is opposite to the first mirror unit 5, and is mounted to the wall m of the fixed cylinder 3, the second mirror unit 6 includes - along the axial direction I The moving second lens barrel 61 and a second lens group 62 disposed in the second lens barrel 61. The second barrel 61 is rotatable and axially! The second guide member 611 is movably sleeved in the inner hole 313 of the cylindrical wall 31 and has three radial projections 611 extending through the second cam grooves 312 of the fixed cylinder 3. Referring to FIG. 5' is a side cross-sectional view showing the decomposition of the performance. When the shading element 53 is to be replaced or replaced, the following steps must be followed: the fixing screws 513 are removed from the collision ring 519. The outer cylinder 3 is taken out from the inner hole 313, and the locking screws (1) are removed from the outer cylinder 513, so that the shielding element 200841115 can be taken out. The inner scale 313 of the inner lens 313 of the projection lens having the light shielding member of the present invention is larger than the maximum outer diameter D2 of the outer cylinder 513, and the second mirror unit 6 and the first guide member 512 need not be disassembled. The first lens barrel 51 and the inner lens 521 can remove the light shielding member 53, which is much simpler than the conventional steps, and can make the maintenance simpler and more efficient. It is worth mentioning that in addition to the preferred embodiment, the outer cylinder 513 is screwed to the inner movement ring 511 by using the fixing screws 514, and the projection lens of the invention having the light shielding element can also utilize the inner movement respectively. The ring 511 and the outer cylinder 513 are provided with threads which are screwed together, or other equivalent manners for the outer cylinder 513 to be detachably mounted on the inner movement ring 511, and the light shielding element can be provided. The projection lens achieves the above effects. However, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention, All remain within the scope of the invention patent. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side elevational cross-sectional view showing a conventional projection lens having a light shielding member; Fig. 2 is a view similar to Fig. 1 illustrating a member to be disassembled for taking a light shielding member; 1 is a cross-sectional view showing a preferred embodiment of a projection lens having a light shielding member of the present invention; FIG. 4 is a front cross-sectional view taken from the IV-IV cut line of FIG. 3, and 200841115 illustrates three fixing screws and three locks. The mounting position of the tightening screw; and FIG. 5 is a view similar to FIG. 3, illustrating the member to be disassembled for taking the next shading element.
10 200841115 【主要元件符號說明】 3…… …·固定筒 517… •…内端部 31…… …·筒壁 518… •…外端部 311 …· •…導溝 519… …·擋環 312 ···. •…第二凸輪溝 52••… •…第一鏡群 313… …·内孑L 521… •…内鏡片 32…… …·安裝板 522… •…外鏡片 4 ···♦··_ …·迴轉琦 53 ••… •…遮光元件 41…… •…第一凸輪溝 531 - •…固定環 5 ······‘ •…第一鏡室單元 532… •…遮光片 51…… …·第一鏡筒 533… •…通光孔 51卜… •…内移環 6…… •…第二鏡筒 512… …·第一導引件 611 - •…第二導引件 513… …·外筒體 62••… •…第二鏡群 514… •…固定螺絲 I •… …·軸向 515… •…鎖緊螺絲 D1… •…内徑 516… …·抵靠面 D2 ···· •…外徑 1110 200841115 [Description of main component symbols] 3... ...fixing cylinder 517... • inner end 31... ...tube wall 518... • outer end 311 ...· •... guide groove 519... ···. •...Second cam groove 52••... •...first mirror group 313...··inner L 521... •...inner lens 32....·mounting plate 522... •...outer lens 4··· ♦··_ ...·转琦53 ••... •...shading element 41...•...first cam groove 531 - •...fixing ring 5 ········...first mirror unit 532... •... The light shielding sheet 51...the first lens barrel 533...the light opening hole 51...the inner movement ring 6...the second lens barrel 512...the first guide member 611--...the second Guide member 513 ... ... outer cylinder 62••... •...second mirror group 514... •...fixing screw I •... axial 515... •...locking screw D1... •...inner diameter 516... Abutment surface D2 ···· •...outer diameter 11