1258597 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種鏡頭裝置，特別是指一種鏡頭總 長度與後焦距比例接近的投影鏡頭裝置。 【先前技術】 在投影系統小型化的發展趨勢下，搭配的投影元件也 必須不斷的突破傳統與改良，才能達到輕量化，小型化的 目的，而習知之投影鏡頭一般為遠心系統，投影鏡頭的總 長度（Overall Lens Length，OLL)與後焦距（Back Focal Length，BFL)的比例都很大，一般〇LL:BFL>2或更大的比 例，當面板尺寸縮小時，習知投影鏡頭之後焦距將不足以 提供足夠的空間來放置如菱鏡等光學元件，也就是說，一 般習知的投影鏡頭相對於面板大小而言都太大，對未來即 將小型化的投影系統實為不便。 【發明内容】 即在提供一種鏡頭總長度與移 Η此，本發明之目的 焦距比例接近的投影鏡頭裝置。 於疋’本發明鏡頭總長度與後焦距比例接近的投影驾 頭裝置’由像端到物端’依序包含有—第—光學群組及— 弟一光學群組。第一光學群 έ日且古 ΑΛτ ^卞群組具有一第一鏡片及一第二海 片’弟一鏡片為負透鏡，隹- 4 Τ 土 弟一鏡片為正透鏡。第二光學君 組具有一第三鏡片、κ Μ 兄乃弟四鏡片及一第五鏡片，第三鏡片名 負透鏡，第四鏡片為正透铹，篦 攻親弟五鏡片為正透鏡。其中， 光學群组滿足下列條件： 1258597 〇. 75<(fi/f2)<〇. 95 其中，fl為第一光學群組之有效焦距，f2為第二光學群 組之有效焦距。 【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二個較佳實施例的詳細說明中，將可 清楚的呈現。 在本發明被詳細描述之前，要注意的是，在以下的說 明内容中，類似的元件是以相同的編號來表示。 〃閱圖]本鲞明鏡頭總長度與後焦距比例接近的投影 鏡頭1置之第-較佳實施例，由像端到物端，裝置依序包 含一第-光學群組！、-光圈2及一第二光學群組3。 —第—光學群組1具有-第-鏡月】I及-第二鏡月 弟一鏡片11為一彎剞备清於 0 ^ n 負I叙，且其凸面朝向像端，第二鏡 】.2為一平凸透鏡，其平面朝向物端。 »第二光學群組3具有—第三鏡片31、_第四^ 32及 -弟五鏡片33。第三鏡片3 f 又U遠叙，其曲率半徑較 i的面朝向像端’第四鏡鏡片 ύΕ ^ ^ , 弓彤正透鏡，其凸面 朝向物端，第五鏡片33為一 31〜u々a ~ 又凸遠鏡。鏡片1】、】2、 。S有兩組平面，且其標示為8]至5】〇。 光圈2位於第一光學群组】及第二 ， 能有效平衡兩群組1、3之鏡片n、J2—群组3之間’ 畸變量，及有效平衡兩群组】、 ”產生的相反 生的1它偯#丄说 之鏡片】I、】2、31〜34產 如像散、場曲、藝形像差等。第一光學群 1258597 組1之作用為將來自不同角度的光束偏折進入鏡頭，第二 光學群組3之作用為將第—光學群組1帶來之不同角度的 光束拉® (偏折）到與光純***行，㈣使投影鏡頭達到遠 心（telecentric)。 上述實施例的光學數據列於下列表一： 表一 平面編號 曲率半徑 距離（mm (mm) 像 600.0 S1 19.45 1.1 S2 10.57 3 S3 8.88 3.7 S4 -270.12 1.8 光圈 4.5 S5 -6.8 1.1 S6 20.77 1.73 S7 -28.77 4.02 S8 -10.26 0 S9 34.35 6.2 S10 18.09 24.241258597 IX. Description of the Invention: [Technical Field] The present invention relates to a lens device, and more particularly to a projection lens device in which the total length of the lens is close to the back focal length. [Prior Art] Under the development trend of miniaturization of the projection system, the matching projection elements must constantly break through the tradition and improvement, in order to achieve the purpose of light weight and miniaturization, and the conventional projection lens is generally a telecentric system, the projection lens The ratio of the total length (OLL) to the back focal length (BFL) is very large, generally 〇LL: BFL> 2 or more, when the panel size is reduced, the focal length of the conventional projection lens It will not be enough to provide enough space for an optical component such as a prism, that is, a conventional projection lens is too large in relation to the panel size, which is inconvenient for a projection system that is about to be miniaturized in the future. SUMMARY OF THE INVENTION It is an object of the present invention to provide a projection lens device in which the focal length of the lens is close to the total length and movement of the lens. In the present invention, the projection driving device 'the end of the total length of the lens and the back focal length ratio 'from the image end to the object end' sequentially includes a - - optical group and a - optical group. The first optical group has a first lens and a second sea plate. The lens of the first lens is a negative lens, and the lens of the 隹-4 Τ 为 is a positive lens. The second optical group has a third lens, a κ 兄 brother and a fourth lens, and a fifth lens, the third lens name is a negative lens, the fourth lens is a positive lens, and the fifth lens is a positive lens. Wherein, the optical group satisfies the following conditions: 1258597 〇. 75<(fi/f2)<〇. 95 where fl is the effective focal length of the first optical group, and f2 is the effective focal length of the second optical group. The above and other technical contents, features and effects of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention. Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals.投影 图 ] 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影 投影- aperture 2 and a second optical group 3. - the first - optical group 1 has - the first - mirror month I and - the second mirror month, a lens 11 is a bend prepared for 0 ^ n negative I, and its convex surface toward the image end, the second mirror] .2 is a plano-convex lens whose plane faces the object end. The second optical group 3 has a third lens 31, a fourth camera 32, and a fifth lens 33. The third lens 3 f is also far from the U, and the surface having the radius of curvature of i is oriented toward the image end, the fourth mirror lens ύΕ ^ ^ , the positive lens of the bow, the convex surface facing the object end, and the fifth lens 33 is a 31~u々 a ~ Convergence mirror. Lens 1],] 2, . S has two sets of planes, and it is labeled as 8] to 5]. Aperture 2 is located in the first optical group] and second, which can effectively balance the 'distortion variables between the lenses n and J2-group 3 of the two groups 1 and 3, and effectively balance the two groups], 1 偯 丄 丄 丄 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 】 第一 第一 第一 第一 第一 第一Entering the lens, the role of the second optical group 3 is to pull the beam of the different angles brought by the first optical group 1 (biased) to be nearly parallel with the light, and (4) to make the projection lens telecentric. The optical data of the example are listed in the following list 1: Table 1 plane number Curvature radius distance (mm (mm) like 600.0 S1 19.45 1.1 S2 10.57 3 S3 8.88 3.7 S4 -270.12 1.8 Aperture 4.5 S5 -6.8 1.1 S6 20.77 1.73 S7 -28.77 4.02 S8 -10.26 0 S9 34.35 6.2 S10 18.09 24.24
表一為本發明投影鏡頭裝置中，每一平面的 資料表。資料表中表示了每—平面的曲率仲、 面之距離（即透鏡厚度、或是至下-透鏡之距離）、 口徑、透鏡之折射減（對於波長為587·56麵的 1258597 以及透鏡之阿貝數值。表中資料為具有—光圈值2 5，一焦 距27.3 6 mm之投影鏡頭裝置。 參閱圖2至圖5’圖2為投影鏡頭裝置之球面差示意圖 ，圖3為投影鏡縣置之像散示意圖，圖4為投影鏡頭裝 置之畸變示意圖，目5為投影鏡頭裝置之橫向色差示意圖 。在圖2至圖5中，該你杜呢絲达。 件距_為2(24丨細，圖中顯示球 面差係於0.2 mm以内，像散係於咖以内，_變係於 0.25%以下’而橫向色差則在〇〇〇7_以内。 _ ^閱圖^^明鏡頭總長度與後焦距比例接近的投影 鏡：士置之弟二佳實施例’由像端到物端，裝置依序包含 -弟^學群組i、—光圈2及_第二光學群組3。 弟一光學群組1呈有一望 m n & /、有弟—鏡片η及-第二鏡月12。 弟鏡片11為一彎型負诱镑 12為一負違鏡，其凸面朝向像端，第二鏡片 、 I、兄，其平面朝向物端。 第二光學群組3具有一 一第五铲M ^ —，兄片31、—第四鏡片32、 弟五鏡片^及—第六鏡片3 鏡，其曲率半徑較 弟一鏡片為一雙凹透 形正透铲1几、；向像端，第四鏡鏡片32為一彎 浴正透鏡’其凸面朝向 第六鏡片34介於第… 鏡片33為-雙凸透鏡， -愈第五鏡片33 r 及第五鏡片33之間，且為 ”弟五鏡片33 φ合之彎 片11、】2、3卜34夂八女 其凸面朝向像端。鏡 。 ° 3有兩組平面，且其標示為S1至S11 學群組3之間 光圈2位於第一井風 九予_組1及第二井 能有效平衡兩群組丨、3 況]]' ]2 ' 31〜34產生的相反 1258597 畸變量，及有效平衡兩群組卜3之鏡片】 生的其它像差，如像散、塥Λ M y 、J〗〜34產 诼政%曲、彗形像差等。μ 一、…、 組]之作用為將偏折废自 弟光學群 才锏祈木自不同角度的光束 光學群组3之作用為將第—光學群组^ 鏡碩’第二 光束拉回(偏折)到與光軸接***行， ：=度的 心（telecentric)。 又'〜鏡碩達到遠 上述實施例的光學數據列於下列表二. 表二 平面編號Table 1 is a data table for each plane in the projection lens device of the present invention. The data table shows the curvature of each plane, the distance between the plane and the surface (ie, the thickness of the lens, or the distance to the lower lens), the aperture, and the refractive reduction of the lens (for the wavelength of 587·56, 1258597 and the lens) The data in the table is a projection lens device with an aperture value of 2 5 and a focal length of 27.3 6 mm. Referring to Figure 2 to Figure 5, Figure 2 is a schematic diagram of the spherical aberration of the projection lens device, and Figure 3 is a projection lens county. Fig. 4 is a schematic diagram of the distortion of the projection lens device, and Fig. 5 is a schematic diagram of the lateral chromatic aberration of the projection lens device. In Fig. 2 to Fig. 5, the spacing of the pieces is 2 (24 丨 thin, The figure shows that the spherical aberration is within 0.2 mm, the astigmatism is within the coffee, the _ is below 0.25%, and the lateral chromatic aberration is within 〇〇〇7_. _ ^图图^^ The total length of the lens and the rear Projection mirror with close focal length ratio: Shiji's brother, the second best embodiment 'from the image end to the object end, the device includes - brother ^ group i, - aperture 2 and _ second optical group 3. Group 1 has a look of mn & /, brother - lens η and - second mirror month 12. A curved type negative lure 12 is a negative mirror with a convex surface facing the image end, a second lens, I, and a brother whose plane faces the object end. The second optical group 3 has a fifth shovel M ^ —, brother The film 31, the fourth lens 32, the fourth lens, and the sixth lens 3 have a radius of curvature that is smaller than that of the lens, and a pair of concave transparent shovel 1; the image end, the fourth mirror 32 It is a curved bath positive lens whose convex surface faces the sixth lens 34. The lens 33 is a lenticular lens, between the fifth lens 33r and the fifth lens 33, and is a "fifth lens 33 φ The curved piece 11, 2, 3, 34, and 38 females have their convex faces facing the image end. Mirror. ° 3 has two sets of planes, and it is marked as S1 to S11. Group 3 is between the aperture 2 in the first well wind nine _ Group 1 and the second well can effectively balance the two groups 丨, 3 cases]]']2 '31~34 produces the opposite 1258597 distortion variable, and effectively balances the two groups of the 3 lens] Other aberrations, such as Astigmatism, 塥Λ M y, J 〗 〖34 诼 % % % 彗 彗 彗 彗 。 。 μ μ μ μ μ μ μ μ μ μ μ μ μ μ μ μ μ μ μ μ μ μ μ μ μ μ μ μ μ μ μ μ The role of the beam optics group 3 is to pull back (bias) the second beam of the first optical group to the optical axis, which is close to the optical axis, and the telecentricity of the == degree. The optical data of the above embodiment is listed in the following table 2. Table 2 plane number
---- 表二為本發明投影鏡頭裝置中，— 母十面的各種特性 Λ :¾ 尘似 or- rt.L·. . 9 1258597 資料表。資料表中表示了每一平 可 十曲的曲率半徑、至下一平 面之距離（即透鏡厚度、或是至 飞疋至下—透鏡之距離）、透鏡之半 口控、透鏡之折射指數（對於波長為587·56 _的光線來說） 以及透鏡之阿貝數值。表中資料為具有—光圈值η，一焦 距28.73 mm〜29.32 mm之投影鏡頭裝置。 需注意的是，表二中，冬伞固 衣〒田先圈2距離第三鏡片31之平 面S5為5.5軸日寺，第二鏡片12之平面W距離光^的 可調範圍為2.0咖至2.6mm，且其相對應物距（川至物端 )為⑽議至⑴而當第二鏡片]2之平面S4距離 光圈2為2.谓咖時，光圈2距離第三鏡片31之平面S5 的可調範圍為5.0 mm至5.85 _，且其相對應物距則至 物端）為 25.9 mm 至 25.0 mm。 參閱圖7至圖IG’圖7為投影鏡頭裝置之球面差示音 圖，圖8為投影鏡頭裝置之像散示意圖，圖9為投影鏡^ 裝置之畸變示意圖，圖10為投影鏡頭裝置之橫向色差示音 圖。在圖7至圖中，該物件距離為25 41麵，圖中= 球面差係於0.1 mm以内，像散係於〇丨mm以内，畸變$ 於1 %以下，而橫向色差則在〇〇〇5 mm以内。 丁 特別加以說明的是，本發明投影投影鏡頭田、 、、| ’敢適 虽的投影距離為600 mm至2400 mm，相對應的投出尺寸為 1 5 inch 至 60 inch 〇 藉以達 前述實施例的投影鏡頭裝置需符合下列條件 到鏡頭總長度與後焦距比例接近之目的： ⑴ 0. 75<(f]/f2)<0. 95 10 群組其3 H第—光學賴1之有效焦距，f2為第二光學 方在於，第 ⑮一個’施例中’其主要差別不同的地 有相較於第一 乐鏡片34，使得其具 34的加入能改盖你、， .攻像口口貝，亦即第六鏡片 。像差，如畸變等，此外， _ — 例中，第一光與 在罘一較佺貫施 移動，以彳❻1及第二光學群組3可在光轴上相對 兩者相對距離為7.35_〜8 35 _。 、、’不Ji所述’採 長度與後隹… W鏡頭衣置’由於鏡頭的總 人卜μ 相虽，大約1:0.85,使得此形式的鏡頭可以配---- Table 2 is the projection lens device of the present invention, the various characteristics of the mother's ten sides Λ: 3⁄4 dust like or- rt.L·. . 9 1258597 data sheet. The data table shows the radius of curvature of each flat, the distance to the next plane (ie, the thickness of the lens, or the distance from the fly to the bottom - the lens), the half-control of the lens, and the refractive index of the lens (for The wavelength is 587·56 _ for the light) and the Abbe number of the lens. The data in the table is a projection lens device having an aperture value η and a focal length of 28.73 mm to 29.32 mm. It should be noted that in Table 2, the winter umbrella is fixed in the first circle of the second lens 31. The plane S5 of the third lens 31 is 5.5 axis Japanese temple, and the plane W of the second lens 12 is adjustable from the range of light to 2.0 coffee. 2.6mm, and its corresponding object distance (Chuanzhi object end) is (10) to (1) and when the plane S4 of the second lens] 2 is 2. The distance from the aperture 2 is 2. When the aperture 2 is from the plane S5 of the third lens 31 The adjustable range is from 5.0 mm to 5.85 _, and the corresponding object distance to the object end is 25.9 mm to 25.0 mm. Referring to FIG. 7 to FIG. IG', FIG. 7 is a spherical aberration diagram of the projection lens device, FIG. 8 is a schematic diagram of the astigmatism of the projection lens device, FIG. 9 is a schematic diagram of distortion of the projection lens device, and FIG. 10 is a lateral view of the projection lens device. Color difference tone map. In Figure 7 to the figure, the object distance is 25 41 faces. In the figure, the spherical aberration is within 0.1 mm, the astigmatism is within 〇丨mm, the distortion is less than 1%, and the lateral chromatic aberration is 〇〇〇 Within 5 mm. In particular, the projection projection lens of the present invention has a projection distance of 600 mm to 2400 mm, and a corresponding projection size of 15 to 60 inches, thereby achieving the foregoing embodiment. The projection lens device must meet the following conditions to achieve a close ratio of the total length of the lens to the back focal length: (1) 0. 75 < (f] / f2) < 0. 95 10 Group 3 H - optical effective resolution of 1 , f2 is the second optical side, in the 15th 'in the embodiment', the main difference is different from the first musical lens 34, so that the addition of 34 can change you, the attacking mouth Shell, also known as the sixth lens. Aberration, such as distortion, etc., in addition, in the example, the first light and the first light are moved relatively, and the relative distance between the first and second optical groups 3 on the optical axis is 7.35_ ~8 35 _. ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
。t问尺寸的其它種類鏡頭還大的投影面板（LCD、LC0S T DMD) ’換句話說，當面板尺寸縮小時，Λ形式的鏡頭可 '八他種颌鏡頭有更小的鏡頭長度，因此，較容易整合 進入行動式裝置當中。 。 ^惟以上所述者，僅為本發明之較佳實施例而已，當不 月匕以此限定本發明實施之範圍，即大凡依本發明申請專利 视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】是本發明鏡頭總長度與後焦距比例接近的投影鏡 頭裝置之第一較佳實施例的一示意圖； 圖2是為圖}所示具有焦距27·36 mni及物件距離 24.24 mm的投影鏡頭裝置的一球面差示意圖； 圖3是為圖1所示具有焦距27.36 mm及物件距離 24·24 mm的投影鏡頭裝置的一像散示意圖； 1258597 圖4是為圖1所示具有焦距27.36 mm及物件距離 24.24 mm的投影鏡頭裝置的一畸變示意圖； 圖5是為圖1所示具有焦距27.36 mm及物件距離 24.24 mm的投影鏡頭裝置的一橫向色差示意圖； 圖6是本發明鏡頭總長度與後焦距比例接近的投影鏡 頭裝置之第二較佳實施例的一示意圖； 圖7是為圖6所示具有焦距29.04 mm及物件距離 25.41mm的投影鏡頭裝置的一球面差示意圖； 圖8是為圖6所示具有焦距29.04 mm及物件距離 25.41mm的投影鏡頭裝置的一像散示意圖； 圖9是為圖6所示具有焦距29.04 mm及物件距離 25.41 mm的投影鏡頭裝置的一畸變示意圖：及 圖10是為圖6所示具有焦距29.04 mm及物件距離 25.41 mm的投影鏡頭裝置的一橫向色差示意圖。 12 1258597 【主要元件符號說明】 1 ..........第一光學群組 2 ..........光圈 3 ..........第二光學群組 11………第一鏡片 12……··…第二鏡片 3 1.........第三鏡片 32 .........第四鏡片 33 .........第五鏡片 34 .........第六鏡片 51 .........平面 52 .........平面 S3 ·. S4·· S5·· S6· S7.. S8.， S9· 510 511 平面 平面 平面 平面 平面 平面 平面 平面 平面 13. Other types of lenses that require size are also large projection panels (LCD, LC0S T DMD) 'In other words, when the panel size is reduced, the Λ-shaped lens can have a smaller lens length, so It's easier to integrate into mobile devices. . However, the above is only a preferred embodiment of the present invention, and is not limited to the scope of the present invention, that is, the simple equivalent of the patent application scope and the description of the invention according to the present invention. Variations and modifications are still within the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 2 is a schematic view showing a first preferred embodiment of a projection lens device having a total lens length and a rear focal length ratio; FIG. 2 is a view showing a focal length of 27·36 mni and an object shown in FIG. A spherical aberration diagram of a projection lens device of 24.24 mm; FIG. 3 is an astigmatism diagram of a projection lens device having a focal length of 27.36 mm and an object distance of 24.24 mm as shown in FIG. 1; 1258597 FIG. 4 is a view of FIG. A distortion diagram of a projection lens device having a focal length of 27.36 mm and an object distance of 24.24 mm; FIG. 5 is a schematic diagram of a lateral chromatic aberration of the projection lens device having a focal length of 27.36 mm and an object distance of 24.24 mm as shown in FIG. 1; A schematic diagram of a second preferred embodiment of a projection lens device having a total lens length and a rear focal length ratio; FIG. 7 is a schematic diagram of a spherical aberration of the projection lens device having a focal length of 29.04 mm and an object distance of 25.41 mm as shown in FIG. 8 is an astigmatism diagram of the projection lens device having a focal length of 29.04 mm and an object distance of 25.41 mm as shown in FIG. 6. FIG. 9 is a focal length of 29.04 mm and object distance as shown in FIG. A distortion diagram of the projection lens unit from 25.41 mm: and Fig. 10 is a schematic diagram of a lateral chromatic aberration of the projection lens unit having a focal length of 29.04 mm and an object distance of 25.41 mm as shown in Fig. 6. 12 1258597 [Description of main component symbols] 1 ..........first optical group 2 .......... aperture 3 ..........second optics Group 11.........first lens 12...the second lens 3 1.........the third lens 32 ...the fourth lens 33 .... ..... fifth lens 34 ... ... sixth lens 51 ... ... plane 52 ... ... plane S3 ·. S4 · · S5 ··S6· S7.. S8., S9· 510 511 Plane plane plane plane plane plane plane plane 13