200821619 玖、發明說明： 【發明所屬之技術領域】 本發明係«於-種拾像綱。此拾像铜可被細於小巧型的相 機，例如數位相機、照相手機、PDA、車载鏡頭等。 【先前技術】200821619 玖, invention description: [Technical field to which the invention pertains] The present invention is a kind of pick-up image. This pickup copper can be thinner than a compact camera such as a digital camera, a camera phone, a PDA, a car lens, and the like. [Prior Art]
具有照相或攝影功能的產品的發展趨勢是不斷地朝向輕薄短小，例 如照相手機、PDA、輯於筆記龍腦上的鱗攝職、安裝於汽車 上的微型攝影機；其中，鏡頭便扮演關鍵性的角色。 例如，日本特許第3567327號，揭露一麵具有$枚鏡片的拾像鏡 頭。其中’自物端至像端依序包括：第—鏡片為新㈣正屈光率透鏡 結構，並且在物端具有凸出的表面；第二透鏡為新月型正屈光率透鏡 結構，並且在像端具有凸出的表面；以及第三透鏡為負屈絲透鏡， 並且在物端具有凸出絲面且在像端射凹_表面。其巾，第三透 鏡的兩個表面皆為非球面，並料三透鏡㈣絲較從鏡片中心朝 向鏡片邊緣逐漸遞減 光率。 因此鏡片巾心是貞屈鱗，鏡片絲處為正屈 然而’第二鏡片之像端是凸出的表面，且第三鏡片之物端也是凸出 絲面。使得f知的拾像鏡頭，««的長度，㈣祕足產品不 斷要求輕薄短小的需求。 【發明内容】 本务明之編的在於提供—種拾像鏡頭，具有較短的綱總長， 5 200821619 且有助於産品的緊湊化。 依據本發明之上述目的，本發明提供一種拾像鏡頭，其從物端至像 端依次包括有：一具有正屈光率之第一透鏡、一具有正屈光率之第二 透鏡、一具有負屈光率之第三透鏡;其中，第三透鏡之物端表面為凹 . 向像端的球面。 如以上所述，第一透鏡為一新月型透鏡，且第一透鏡之物端表面凸 _ 向物端；以及第二透鏡為一新月型透鏡，且第二透鏡之像端表面凸向 像端。 如以上所述，該拾像鏡頭應滿足下列條件： 、 〇.7<fl/f<i.〇 、⑴ . 其中fl表示第一透鏡的焦距值；f表示拾像鏡頭的焦距值。當滿足該條 件時，可以確保本發明之拾像鏡頭的整體長度能夠有效縮短，得以使 得更緊凑化。 • 如以上所述，孔徑光闌位於第一透鏡與第二透鏡之間，或孔鏡光闌 位於物端與第一透鏡之間。 如以上所述，第一、第二及第三透鏡皆是塑膠鏡片，且都具有至少 一個非J表面。 如以上所述，因第二透鏡之像端表面凸向像端，且第三透鏡之物端 表面凹向像端·，使得本發明之拾像鏡頭之整體長度能夠更加有效地縮 短，並能使得産品緊湊化的優點。 【實施方式】 6 200821619 本發明拾像鏡頭主要由三個透鏡組成，從物端至像端依次爲：具有 正屈光率的第-透鏡，其位於物端之第一表面爲朝向物端之凸面，用 以將大視角範_的光線收人，而且該第—表面是非球面的設 計二藉此控·狀變形，·第二透正透鏡，其置於像端 之第四表面為朝向像端之凸面，該第二透鏡具有至少—個非球面，主 要作爲第-透叙鑛，顧贿高練聚缝力，有助於縮短 拾像鏡頭紐；以及具有貞觀軸第三魏，其錄物狀第五表 面為朝向像端之凹面’且該第五表面為球面，第三透鏡有助於光學系 統之色差修正，並可以減少光損失。 在本發明拾像鏡頭之第_、二及三透鏡上均採用了至少一非球面的 汉3十，而轉非球面之表面都可以有效地控制球面像差及慧差之形 成’藉此可以使得拾像鏡雖夠達雜大的細，而且因至少三個表 面是採用非球面的設計，可以有效驗f要達到廣視⑽長度及透鏡 數量。 本發明拾像鏡頭應滿足條件（1): 〇.7<fl/f<l.〇 (1) 其中fl表不弟-透鏡的焦距值;f表示拾像鏡頭的焦距值。在上述條件 ⑴中右fl/f小於〇·7，則細後群之聚焦能力比較弱，這樣會使得 正體長度《。故’滿足條件⑴可以雜本發明拾像_在維持好 的成像品質之特闕_，其長度能財效縮短，從而使得産品 緊湊。 ° 200821619 本發明之拾像鏡頭還可以根據需要，在第三透鏡的後面加入破璃平 板’以提供濾光或抗反射等作用。 於本發明之拾像鏡頭中，孔徑光闌可設置於第一透鏡與第二透鏡之 間，或者孔徑光闌可設置於物端與第一透鏡之間。 於本發明之拾像鏡頭中，第三透鏡於光軸上的屈光率為負，且第二 透鏡之屈光率隨著遠離光軸位置而逐漸遞減。 _ 茶照上述條件，下面將詳細描述本發明之較佳實施例。 【弟一實施例】The trend of products with photography or photography is to keep moving towards thin and light, such as camera phones, PDAs, scales on the notes, and miniature cameras installed in cars. Among them, the lens plays a key role. Character. For example, Japanese Patent No. 3,567,327 discloses a pickup lens having a lens of one side. The 'from the object end to the image end sequentially includes: the first lens is a new (four) positive refractive power lens structure, and has a convex surface at the object end; the second lens is a crescent-type positive refractive power lens structure, and The surface has a convex surface at the image end; and the third lens is a negative filament lens, and has a convex filament surface at the object end and a concave surface at the image end. In the towel, both surfaces of the third lens are aspherical, and the three-lens (four) wire gradually decreases in light rate from the center of the lens toward the edge of the lens. Therefore, the lens core is a scale, and the lens is positively bent. However, the image end of the second lens is a convex surface, and the object end of the third lens is also a convex surface. In order to make the pickup lens, the length of ««, (4) secret products are constantly demanding light and short. SUMMARY OF THE INVENTION The present invention is directed to providing a pickup lens having a short overall length, 5 200821619 and contributing to product compactness. According to the above object of the present invention, the present invention provides an image pickup lens comprising, in order from the object end to the image end, a first lens having a positive refractive power, a second lens having a positive refractive power, and one having a third lens having a negative refractive power; wherein the object end surface of the third lens is concave. The spherical surface toward the image end. As described above, the first lens is a crescent lens, and the object end surface of the first lens is convex toward the object end; and the second lens is a crescent lens, and the image end surface of the second lens is convex Like the end. As described above, the pickup lens should satisfy the following conditions: 〇.7 <fl/f<i.〇, (1) . where f denotes the focal length value of the first lens; f denotes the focal length value of the pickup lens. When this condition is satisfied, it is possible to ensure that the overall length of the pickup lens of the present invention can be effectively shortened, resulting in a more compact. • As described above, the aperture stop is located between the first lens and the second lens, or the aperture stop is located between the object end and the first lens. As described above, the first, second and third lenses are all plastic lenses and each have at least one non-J surface. As described above, since the image end surface of the second lens is convex toward the image end, and the object end surface of the third lens is concave toward the image end, the overall length of the pickup lens of the present invention can be more effectively shortened and The advantage of making the product compact. [Embodiment] 6 200821619 The image pickup lens of the present invention is mainly composed of three lenses, from the object end to the image end, in order: a first lens having a positive refractive power, and the first surface of the object end is toward the object end. a convex surface for absorbing light of a large viewing angle, and the first surface is an aspherical design. The second transparent lens is placed on the fourth surface of the image end to face the image. The convex surface of the end, the second lens has at least one aspherical surface, mainly as the first-transparent mine, and the bribe is highly tempered, which helps to shorten the pickup lens; and has the third Wei of the Guanguan axis. The fifth surface of the object is a concave surface toward the image end and the fifth surface is a spherical surface, and the third lens contributes to chromatic aberration correction of the optical system and can reduce light loss. At least one aspherical surface is used on the first, second and third lenses of the image pickup lens of the present invention, and the surface of the aspherical surface can effectively control the formation of spherical aberration and coma. Although the pickup mirror is large enough, and because at least three surfaces are aspherical, it can effectively check the length of the wide view (10) and the number of lenses. The pickup lens of the present invention should satisfy the condition (1): 〇.7 <fl/f<l.〇 (1) where f represents the focal length value of the lens; f represents the focal length value of the pickup lens. In the above condition (1), if the right fl/f is smaller than 〇·7, the focusing ability of the fine group is weak, which will make the length of the body. Therefore, the condition (1) can be mixed with the image of the present invention. In terms of maintaining good image quality, the length can be shortened, thereby making the product compact. ° 200821619 The pickup lens of the present invention can also add a glass plate ' behind the third lens as needed to provide filtering or anti-reflection. In the pickup lens of the present invention, the aperture stop may be disposed between the first lens and the second lens, or the aperture stop may be disposed between the object end and the first lens. In the pickup lens of the present invention, the refractive power of the third lens on the optical axis is negative, and the refractive power of the second lens gradually decreases as moving away from the optical axis position. _ Tea According to the above conditions, the preferred embodiments of the present invention will be described in detail below. [Another embodiment]
第1圖概要顯示本發明之第一實施例之拾像鏡頭之結構圖。如第1 、 圖所不，第一實施例之拾像鏡頭10主要由三個透鏡組成，從物端OBJ 鱗端1MA依次爲：Μ正屈光率的第-透鏡11，其位於物端OBJ 之第-表面si爲朝向物端之凸面，用以將大視角範圍内的光線收 入’而且該第-表面S1是採用非球面的設計，藉此控制桶狀變形·第 • 4鏡12係一新月伽正透鏡，其置於像端IMA之第四表面S4為朝 向像端IMA之凸面’該第二透鏡12具有至少一個非球面，主要作爲第 1鏡11之補償，並用以提高光線聚焦能力，有助於縮短拾像鏡 員-〇長度’ R置於弟-透鏡n與第二透鏡12之間的孔徑光闌伽； 以及具有負屈光率的第三透鏡13，其位於物端0BJ之第五表面S5為 朝向像端說之㈣，且該第五表㈣為辆，第三透鏡13有助於 光學系統之色差修正，並可以減少光損失。 在表及表一所不的數值實施例中，本發明拾像鏡頭之孔徑數值史 200821619 number)爲1:3·2，fl/f=0.875，所有距離值（曲率半徑及厚度）均以毫 米爲單位。 表一 面編號 曲率半徑(mm) (Radius) 厚度(mm) (Thickness) 折射率 _ 阿貝係數 (Vd) OBJ 無窮大 無窮大 SI 0.3 0.202 1.515 56.97 S2 0.692 0.024 STO 無窮大 0.178 S3 -0.27 0.187 1.515 56.97 S4 -0.177 0.015 S5 -0.839 0.18 1.515 56.97 S6 0.526 0.252 S7 無窮大 0.089 1.52 64.17 S8 無窮大 0.005 IMA 無窮大 表二 F/# 3.2 F 1.0 mm fl 0.875 mm 在表二中，F/#表示拾像鏡頭10之焦距與孔徑的比值，[值表示拾 像鏡頭1〇之焦距，fi表示第一透鏡之焦距。Fig. 1 is a view schematically showing the configuration of a pickup lens according to a first embodiment of the present invention. As shown in FIG. 1 and FIG. 1, the image pickup lens 10 of the first embodiment is mainly composed of three lenses, and from the object end OBJ scale end 1MA, the first lens 11 of the positive refractive power is located at the object end OBJ. The first surface si is a convex surface facing the object end for collecting light in a wide viewing angle range, and the first surface S1 is designed by using an aspheric surface, thereby controlling the barrel deformation and the fourth mirror 12 The ecliptic positive lens is disposed on the fourth surface S4 of the image end IMA as a convex surface toward the image end IMA. The second lens 12 has at least one aspheric surface, which is mainly used as compensation for the first mirror 11 and is used for improving light focusing. Capability, which helps to shorten the aperture beam 阑 of the pickup lens-〇 length 'R between the lens-lens n and the second lens 12; and a third lens 13 having a negative refractive power, which is located at the object end The fifth surface S5 of 0BJ is referred to as (4) toward the image end, and the fifth table (four) is a vehicle, and the third lens 13 contributes to chromatic aberration correction of the optical system, and can reduce light loss. In the numerical examples of the table and the table 1, the aperture value history of the invention lens of the invention is 2008: 21619. The number is 1:3·2, fl/f=0.875, and all the distance values (radius of curvature and thickness) are in millimeters. For the unit. Table side number Curvature radius (mm) (Radius) Thickness (mm) (Thickness) Refractive index _ Abbe's coefficient (Vd) OBJ Infinity infinity SI 0.3 0.202 1.515 56.97 S2 0.692 0.024 STO Infinity 0.178 S3 -0.27 0.187 1.515 56.97 S4 -0.177 0.015 S5 -0.839 0.18 1.515 56.97 S6 0.526 0.252 S7 Infinity 0.089 1.52 64.17 S8 Infinity 0.005 IMA Infinity Table 2 F/# 3.2 F 1.0 mm fl 0.875 mm In Table 2, F/# indicates the focal length and aperture of the pickup lens 10. Ratio, [value represents the focal length of the pickup lens, and fi represents the focal length of the first lens.
在第一實施例中，第一透鏡11、第二透鏡12採用兩面均爲非球面 的設計，而第三透鏡13只有第六表面S6為非球面，上述非球面的設 +Ah4+Bh6+Ch8+Dh10+Eh12+FhI4+Gh16 計公式表示如下： ch2 z = ---—— --- l+[l-(k+l)c2h2]1/2 200821619 其中：z爲沿光軸方向在高度爲h的位置以表面頂點作參考距光軸 的位移值；k爲錐度常數（Conic Constant) ; c=l/r，j/表示曲率半徑；h 表不鏡片同度，A表不弟四階非球面係數（4th Order Aspherical Coefficient )，B 表不弟六階非球面係數（6th Order Aspherical Coefficient )，C 表不弟八階非球面係數（8¾ Order Aspherical Coefficient )，D 表不弟十階非球面係數（i〇th Order Aspherical Coefficient) ; E 表示第十二階非球面係數（12th Order Aspherical 春 Coefficient) ; F表示第十四階非球面係數（14th Order AsphericalIn the first embodiment, the first lens 11 and the second lens 12 are designed to have aspherical surfaces on both sides, and the third lens 13 has only the sixth surface S6 which is aspherical, and the aspherical surface is set to +Ah4+Bh6+Ch8. The formula of +Dh10+Eh12+FhI4+Gh16 is expressed as follows: ch2 z = --- -- --- l+[l-(k+l)c2h2]1/2 200821619 where: z is the height along the optical axis The position of h is the surface vertex as the reference displacement value from the optical axis; k is the cone constant (Conic Constant); c=l/r, j/ is the radius of curvature; h is not the same degree of lens, A is not the fourth order 4th Order Aspherical Coefficient, B is 6th Order Aspherical Coefficient, C is 8th Order Aspherical Coefficient, and D is 10th Order Aspherical Coefficient. (i〇th Order Aspherical Coefficient) ; E is the 12th Order Aspherical Spring Coefficient; F is the 14th Order Aspherical
Coefficient) ; G表示第十六階非球面係數（16th Order Aspherical Coefficient) ° ' 在第一實施例中，非球面係數的具體數值爲： ‘ 面編號S1 (第一透鏡之物端側）： Κ=-0·49、Α=6·07、Β=-234·15、C=1.05E4、D=-1.67E5、Ε=2·736Ε5、 F=2.38E7、G=- 1·61Ε8 面編號S2 (第一透鏡之像端側）： Κ=15·67、Α=-4·7、Β=179·82、C=-1.47E4、D=-1.53E5、E=0、F=0、G=0 面編號S3 (第二透鏡之物端側）： K=-1.26、Α=-24·47、Β=-472·03、C=1.25E4、D=-5.73E5、Ε=1·3Ε6、 F=2.63E8、G=-3.53E9 面編號S4 (第二透鏡之像端側）·· Κ=-2·02、Α=48·52、Β=287·05、C=-6946.6、D=1.42E4、Ε=9·08Ε5、 200821619 F=3.87E6、G=-9.09E7 面編號S6 (第三透鏡之像端側）·· K=0、Α=-21 ·21、B =243.44、C=-2352.1、D= 1 ·44Ε4、Ε=-5·54Ε4、F= 1 ·22Ε5、 G=-L22E5 參閱第2圖，於650 nm至470 nm的波長範圍，顯示此拾像鏡頭 之縱向球面像差小於〇.〇5腿。參閱第3圖，於65〇腦至47〇11111的波 長範圍，顯示此拾像鏡頭之場曲像差小於〇〇5mm。參閱第4圖，顯示 此拾像鏡頭之畸變像差小於3%。參閱第5圖，於最大縱向及橫向影像 高度範圍内，顯示此拾像鏡頭的彗星像差皆小於1〇]11111。參閱第6圖， 於空間頻率15〇CyCles/mm時，縱向及橫向影像iMTF值仍有〇·5。如 以上第2圖至第6圖所述，依照上述第一實施例進行設計，本發明之 拾像鏡頭10之各種像差可以得到有效校正。 【第二實施例】 第7圖概要顯示本發明之第二實施例之拾像鏡頭之結構圖。如第7 圖所示，第二實施例之拾像鏡頭10主要由三個透鏡組成，從物端⑽ i 像—端—IMA 依-具-有- 之第-表面S1爲朝向物端OBI之凸面，用以將大視角範圍内的光線收 入，而且該第-表面S1是採用非球面的設計，藉此控制桶狀變形；設 置於物端OBJ與第-透鏡11之間的孔徑光闇ST〇 ;第二透鏡係一 新月型的正透鏡，其置於像端IMA之第四表面S4辅向像端臓之 凸面，該第二透鏡12具有至少-個非球面，主要作爲第—透鏡u之補 200821619 償鏡片，並用以提高光線聚焦能力，有助於縮短拾像鏡頭ίο長度；以 及具有負屈光率的第三透鏡13，其位於物端OBJ之第五表面S5為朝 向像端IMA之凹面，且該第五表面S5為球面，第三透鏡13有助於光 學系統之色差修正，並可以減少光損失。 在表三及表四所示的數值實施例中，本發明拾像鏡頭之孔徑數值(F number)爲1:2.8，fl/f=0.922，所有距離值（曲率半徑及厚度）均以毫 米爲單位。 表三 面編號 曲率半徑(mm) 厚度(mm；) 折射率 阿貝係數 —______ (Radius) (Thickness) (Nd) (Vd) ^OBJ 無窮大 無窮大 STO — 無窮大 0 __S1 0.39 0.137 1.515 56.96 1.944 0.244 -0.439 0.158 1.515 56.96 S4 — -0.179 0.103 .__S5 -0.494 0.289 1.585 29.91 __S6 0.51 0.046 __無窮大 0.068 1.52 64.17 S8 ^--- 無窮大 0.22 IMA ----— 無窮大 表四 F/# 2.8 一 f 1.0 mm _ fl 0.922 mm 在表四中’ F/#表示拾像鏡頭10之焦距與孔徑的比值，g表示拾 像鏡頭10之焦距，fl表示第一透鏡之焦距。 12 200821619 在第二實施例中，第一透鏡11、第二透鏡12採用兩面均爲非球面 的設計，而第三透鏡13只有第六表面S6為非球面。在第二實施例中， 非球面係數的具體數值爲： 面編號S1 (第一透鏡之物端側）: Κ=1·18、Α=-1·63、Β=-111·14、C=6119.24、D=-2.32E5、Ε=1·99Ε6、 F=9.09E7 > G=-1.76E9 面編號S2 (第一透鏡之像端側）： Κ=-143·07、Α=3·75、Β=-76·(Π、C=190639、D=-8365.25、E=0、F=〇、 G=〇 面編號S3 (第二透鏡之物端側）： K-0.355、Α=-11·94、Β=578·38、C=-3.42E4、D=6.34E5、Ε=1·96Ε6、 f==-1.48E8、G=9.8E8 面編號S4 (第二透鏡之像端側）： Κ=-2·79、Α=-24·13、Β=529·11、C=-9675.96、D=L42E4、Ε=1·39Ε6、 F"4.41E6 > G=-1.39E8 面編號S6 (第三透鏡之像端側）·· Κ：=〇、Α=_22·09、Β=305·26、0-3397.26、D=2.44E4、E=4.09E5、F=2.7E5、 G==-2.89E5 參閱第8圖，於650 nm至470 nm的波長範圍，顯示此拾像鏡頭 之縱向球面像差小於0.03 mm。參閱第9圖，於650 nm至470nm的波 長範圍，顯示此拾像鏡頭之場曲像差小於0Ό5 mm。參閱第10圖，顯 13 200821619 示岭像鏡頭之畸變像差小於3%。參閱第11圖，於最大縱向及橫向 影像南度範圍内，顯示此拾像鏡頭的_星像差皆小於帅。參閱第 發明之拾像鏡頭1G之各種像差可以_有效校正。 【弟二實施例】 圖’於空嗎15G eydes/mm時，縱向及橫崎之卿值仍有 α5。如以上第8圖至第12圖所述，依照上述第二實施例進行設計，本Coefficient) ; G represents the 16th Order Aspherical Coefficient ° ' In the first embodiment, the specific value of the aspherical coefficient is: 'face number S1 (object end side of the first lens): Κ =-0·49, Α=6·07, Β=-234·15, C=1.05E4, D=-1.67E5, Ε=2·736Ε5, F=2.38E7, G=-1·61Ε8 face number S2 (image end side of the first lens): Κ=15·67, Α=-4·7, Β=179·82, C=-1.47E4, D=-1.53E5, E=0, F=0, G =0 face number S3 (object end side of the second lens): K=-1.26, Α=-24·47, Β=-472·03, C=1.25E4, D=-5.73E5, Ε=1·3Ε6 , F=2.63E8, G=-3.53E9 face number S4 (image end side of the second lens)·· Κ=-2·02, Α=48·52, Β=287·05, C=-6946.6, D =1.42E4, Ε=9·08Ε5, 200821619 F=3.87E6, G=-9.09E7 Face number S6 (image end side of the third lens)·· K=0, Α=-21 ·21, B =243.44, C=-2352.1, D=1 ·44Ε4, Ε=-5·54Ε4, F= 1 ·22Ε5, G=-L22E5 Refer to Figure 2, showing the longitudinal direction of this pickup lens in the wavelength range from 650 nm to 470 nm. The spherical aberration is less than 〇.〇5 legs. Referring to Figure 3, the range of wavelengths from 65 〇 to 47 〇 11111 shows that the field aberration of this pickup lens is less than 〇〇5 mm. Refer to Figure 4 to show that the distortion of this pickup lens is less than 3%. Referring to Figure 5, the coma aberration of this pickup lens is less than 1〇11111 in the maximum vertical and horizontal image height range. Referring to Figure 6, the iMTF values for the vertical and horizontal images are still 〇·5 at a spatial frequency of 15 〇CyCles/mm. As described above with reference to Figs. 2 to 6, the various aberrations of the pickup lens 10 of the present invention can be effectively corrected in accordance with the above-described first embodiment. [Second Embodiment] Fig. 7 is a view showing the configuration of a pickup lens according to a second embodiment of the present invention. As shown in FIG. 7, the pickup lens 10 of the second embodiment is mainly composed of three lenses, and the first surface S1 from the object end (10) i-end-IMA y-with-with is toward the object end OBI. a convex surface for absorbing light in a large viewing angle range, and the first surface S1 is designed to adopt an aspherical surface, thereby controlling barrel deformation; and an aperture light darkness ST disposed between the object end OBJ and the first lens 11 The second lens is a crescent-shaped positive lens which is disposed on the convex surface of the auxiliary surface end 第四 of the fourth surface S4 of the image end IMA, and the second lens 12 has at least one aspheric surface, mainly as the first lens u supplement 200821619 pays for the lens, and is used to improve the light focusing ability, which helps to shorten the length of the pickup lens ίο; and the third lens 13 having a negative refractive power, which is located at the fifth surface S5 of the object end OBJ toward the image end The concave surface of the IMA, and the fifth surface S5 is a spherical surface, and the third lens 13 contributes to chromatic aberration correction of the optical system and can reduce light loss. In the numerical examples shown in Tables 3 and 4, the aperture value (F number) of the pickup lens of the present invention is 1:2.8, fl/f=0.922, and all distance values (radius of curvature and thickness) are in millimeters. unit. Table three-sided number Curvature radius (mm) Thickness (mm;) Refractive index Abbe's coefficient—______ (Radius) (Thickness) (Nd) (Vd) ^OBJ Infinity infinity STO — Infinity 0 __S1 0.39 0.137 1.515 56.96 1.944 0.244 -0.439 0.158 1.515 56.96 S4 — -0.179 0.103 .__S5 -0.494 0.289 1.585 29.91 __S6 0.51 0.046 __infinity 0.068 1.52 64.17 S8 ^--- infinity 0.22 IMA ----- infinity table four F/# 2.8 a f 1.0 mm _ fl 0.922 Mm In Table 4, 'F/# indicates the ratio of the focal length to the aperture of the pickup lens 10, g indicates the focal length of the pickup lens 10, and f1 indicates the focal length of the first lens. 12 200821619 In the second embodiment, the first lens 11 and the second lens 12 are designed to have aspherical surfaces on both sides, and the third lens 13 has only the sixth surface S6 which is aspherical. In the second embodiment, the specific value of the aspherical coefficient is: face number S1 (object end side of the first lens): Κ=1·18, Α=-1·63, Β=-111·14, C= 6119.24, D=-2.32E5, Ε=1·99Ε6, F=9.09E7 > G=-1.76E9 face number S2 (image end side of the first lens): Κ=-143·07, Α=3·75 Β=-76·(Π, C=190639, D=-8365.25, E=0, F=〇, G=〇面号S3 (object end side of the second lens): K-0.355, Α=-11 ·94, Β=578·38, C=-3.42E4, D=6.34E5, Ε=1·96Ε6, f==-1.48E8, G=9.8E8 face number S4 (image end side of the second lens): Κ=-2·79, Α=-24·13, Β=529·11, C=-9675.96, D=L42E4, Ε=1·39Ε6, F"4.41E6 > G=-1.39E8 face number S6 ( The image end side of the third lens··· Κ:=〇, Α=_22·09, Β=305·26, 0-3397.26, D=2.44E4, E=4.09E5, F=2.7E5, G==- 2.89E5 Refer to Figure 8. The longitudinal spherical aberration of this pickup lens is less than 0.03 mm in the wavelength range from 650 nm to 470 nm. See Figure 9 for the pickup lens in the wavelength range from 650 nm to 470 nm. The field curvature is less than 0Ό5 mm. See Figure 10, showing 13 20 0821619 The distortion aberration of the Shiling lens is less than 3%. Referring to Figure 11, the _ star aberration of the pickup lens is smaller than the handsome in the maximum vertical and horizontal image. See the lens of the invention. The various aberrations of 1G can be effectively corrected. [Second Embodiment] When the picture is '15G eydes/mm, the vertical and horizontal Kawasaki values still have α5. As shown in Figures 8 to 12 above, Designed in accordance with the second embodiment described above, this
第13圖概要顯示本發明n施例之拾像鏡胃以麵。^ 13圖所示’第三實補之拾像鏡頭ω主要由三個透鏡組成，從物端 OBJ至像端腿依次爲：具有正屈光率的第一透鏡n，其位於物端 OBJ之第-表面S1爲朝向物端⑽之凸面，用以將大視角範圍内的光 線收入’而且該第-表面S1是採用非球面的設計，藉此控制桶狀變形，· 第二透鏡12係-新月型的正透鏡，其置於像端論之第四表面似為 朝向像端IMA之凸面’該第二透鏡12具有至少—個非球面，主要作爲 第-透鏡11之補償制，朋以提高光線聚焦能力，有助於縮短拾像 鏡頭10長度;設置於第-透鏡11與第二透鏡12之間的孔徑光闌ST〇; 以及具有負屈光率的第二透鏡13，其位於物端QBi之第五表面S5為 朝向像端IMA之凹面，且該第五表面85為球面，第三透鏡13有助於 光學系統之色差修正，並可以減少光損失。 在表五及表六所示的數值實施例中，本發明拾像鏡頭之孔徑數值(F number)爲1:3.0 ’ fl/f=〇.9〇2，所有距離值（曲率半徑及厚度）均以毫 米爲單位。 14 200821619 表五 面編號 曲率半徑(mm) (Radius) 厚度(mm) (Thickness) 折射率 (Nd) 阿貝係數 (Vd) OBJ 無窮大 無窮大 SI 0.34 0.195 1.515 56.96 S2 1.01 0.034 STO 無窮大 0.182 S3 -0.273 0.185 1.515 56.96 S4 -0.189 0.051 S5 -1.08 0.159 1.515 56.96 S6 0.516 0.203 S7 無窮大 0.068 1.52 64.17 S8 無窮大 0.08 MA 無窮大Fig. 13 is a view schematically showing the surface of the mirror of the n embodiment of the present invention. ^13 shows that the 'third complementary pick-up lens ω is mainly composed of three lenses, from the object end OBJ to the image end leg in order: the first lens n with positive refractive power, which is located at the object end OBJ The first surface S1 is a convex surface facing the object end (10) for collecting light in a wide viewing angle range and the first surface S1 is designed to be aspherical, thereby controlling the barrel deformation, and the second lens 12 is - A crescent-shaped positive lens which is placed on the fourth surface of the image like the convex surface facing the image end IMA. The second lens 12 has at least one aspheric surface, mainly serving as a compensation system for the first lens 11. Increasing the light focusing ability, helping to shorten the length of the pickup lens 10; the aperture stop ST〇 disposed between the first lens 11 and the second lens 12; and the second lens 13 having a negative refractive power, which is located at the object The fifth surface S5 of the end QBi is a concave surface facing the image end IMA, and the fifth surface 85 is a spherical surface, and the third lens 13 contributes to chromatic aberration correction of the optical system and can reduce light loss. In the numerical examples shown in Tables 5 and 6, the aperture value (F number) of the pickup lens of the present invention is 1:3.0 'f/f=〇.9〇2, and all distance values (curvature radius and thickness) All in millimeters. 14 200821619 Table five-face number Curvature radius (mm) (Radius) Thickness (mm) (Thickness) Refractive index (Nd) Abbe's coefficient (Vd) OBJ Infinity infinity SI 0.34 0.195 1.515 56.96 S2 1.01 0.034 STO Infinity 0.182 S3 -0.273 0.185 1.515 56.96 S4 -0.189 0.051 S5 -1.08 0.159 1.515 56.96 S6 0.516 0.203 S7 Infinity 0.068 1.52 64.17 S8 Infinity 0.08 MA Infinity
表六 F/# 3.0 f L0 mm fl 0.902 mmTable VI F/# 3.0 f L0 mm fl 0.902 mm
在表六中，F/#表示拾像鏡頭10之焦距與孔徑的比值，f值表示拾 像鏡頭10之焦距，fl表示第一透鏡之焦距。 在第三實施例中，第一透鏡11、第二透鏡12採用兩面均爲非球面 的設計，而第三透鏡13只有第六表面S6為非球面。在第三實施例中， 非球面係數的具體數值爲： 面編號S1 (第一透鏡之物端側）： Κ=0·626、Α=-0·389、Β=453·62、C=6181.36、D=-1.45E5、E=9.88E5、 F=L08E7、G-4.66E8 15 200821619 面編號S2 (第一透鏡之像端側）·· Κ=9·502、Α=-1·34、Β=131·3、C=-6793.89、D=1.27E5、E=0、F=0、G=0 面編號S3 (第二透鏡之物端側）： K=-1.302、Α=-20·25、Β=139·54、0-1.7E4、D=3.06E5、E=5.77E6、 F=-1.56E8、G=2.6E7 面編號S4 (第二透鏡之像端側）： Κ=-2·537、Α=-20·11、Β=305·01、C=-5055.17、D=1.88E4、Ε=6·28Ε5、 F=-6.65Ε5、G=-4O6E7 面編號S6 (第三透鏡之像端側）: Κ=0、Α=-21.2、Β=279·76、C=-3173/77、D=2.33E4、E=-l .07E5、F=2.73E5、 G=-3E5 參閱第14圖，於650 nm至470 nm的波長範圍，顯示此拾像鏡頭 之縱向球面像差小於0.03 mm。參閱第15圖，於650 nm至470 nm的 波長範圍，顯示此拾像鏡頭之場曲像差小於0·05 mm。參閱第16圖， 顯示此拾像鏡頭之畸變像差小於3%。參閱第17圖，於最大縱向及橫 向影像高度範圍内，顯示此拾像鏡頭的彗星像差皆小於1〇 μπ!。參閱第 18圖，於空間頻率l5〇Cydes/mm時，縱向及横向影像之MTF值仍有 〇·5。如以上第14圖至第18圖所述，依照上述第三實施例進行設計， 本發明之拾像鏡頭10之各種像差可以得到有效校正。 綜上所述，本發明確已符合發明專利之要件，美依法提出專利申 請。惟，以上所述者僅爲本發明之較佳實施方式，舉凡熟習本案技術 16 200821619 之人士援依本發明之精神所作之等效修飾或變化，皆涵蓋於後附之申 請專利範圍内。 【圖式簡單說明】 第1圖係本發明第一實施例之拾像鏡頭之各透鏡的位置關係示意圖。 第2至6圖係依據本發明拾像鏡頭之第一實施例繪製的縱向球面像差、 場曲像差、畸變像差、慧星像差及MTF曲線示意圖。 第7圖係本發明第二實施例之拾像鏡頭之各透鏡的位置關係示意圖。 第8至12圖係依據本發明拾像鏡頭之第二實施例繪製的縱向球面像 差、場曲像差、畸變像差、慧星像差&MTF曲線示意圖。 …圖係本發明第二貫施例之拾像鏡頭之各透鏡的位置關係示立囷 二4至18圖係依據*發明拾*鏡頭之第三實施例綠製的縱向球二 差、場曲像差、畸變餘、慧星縣及MTF轉示意圖。、°球面像 【主要元件符號說明】In Table 6, F/# represents the ratio of the focal length of the pickup lens 10 to the aperture, f represents the focal length of the pickup lens 10, and f represents the focal length of the first lens. In the third embodiment, the first lens 11 and the second lens 12 are designed to have aspherical surfaces on both sides, and the third lens 13 has only the sixth surface S6 which is aspherical. In the third embodiment, the specific value of the aspherical coefficient is: face number S1 (object end side of the first lens): Κ=0·626, Α=-0·389, Β=453·62, C=6181.36 , D=-1.45E5, E=9.88E5, F=L08E7, G-4.66E8 15 200821619 Face number S2 (image end side of the first lens)·· Κ=9·502, Α=-1·34, Β =131·3, C=-6793.89, D=1.27E5, E=0, F=0, G=0 face number S3 (object end side of the second lens): K=-1.302, Α=-20·25 Β=139·54, 0-1.7E4, D=3.06E5, E=5.77E6, F=-1.56E8, G=2.6E7 Face number S4 (image end side of the second lens): Κ=-2· 537, Α=-20·11, Β=305·01, C=-5055.17, D=1.88E4, Ε=6·28Ε5, F=-6.65Ε5, G=-4O6E7 face number S6 (image of the third lens End side): Κ=0, Α=-21.2, Β=279·76, C=-3173/77, D=2.33E4, E=-l .07E5, F=2.73E5, G=-3E5 See section 14 In the wavelength range from 650 nm to 470 nm, the longitudinal spherical aberration of this pickup lens is shown to be less than 0.03 mm. Referring to Figure 15, the field curvature of this pickup lens is less than 0·05 mm in the wavelength range from 650 nm to 470 nm. Referring to Figure 16, the distortion of the pickup lens is shown to be less than 3%. Referring to Figure 17, the coma aberration of this pickup lens is less than 1〇 μπ! in the maximum longitudinal and horizontal image height range. Referring to Figure 18, the MTF values for the vertical and horizontal images are still 〇·5 at a spatial frequency of l5〇Cydes/mm. As described in the above Figs. 14 to 18, in accordance with the third embodiment described above, various aberrations of the pickup lens 10 of the present invention can be effectively corrected. In summary, the present invention has indeed met the requirements of the invention patent, and the United States has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art of the present invention are disclosed in the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the positional relationship of respective lenses of the pickup lens of the first embodiment of the present invention. 2 to 6 are schematic diagrams of longitudinal spherical aberration, field curvature aberration, distortion aberration, comet aberration, and MTF curve drawn according to the first embodiment of the pickup lens of the present invention. Fig. 7 is a view showing the positional relationship of the lenses of the pickup lens of the second embodiment of the present invention. Figures 8 through 12 are schematic views of longitudinal spherical aberration, field curvature aberration, distortion aberration, comet aberration & MTF curve plotted in accordance with a second embodiment of the pickup lens of the present invention. The positional relationship of the lenses of the second embodiment of the present invention is shown in the second embodiment of the present invention. The second embodiment of the invention is based on the third embodiment of the invention. Aberration, distortion, Huixing County and MTF turn schematic. , ° spherical image [main component symbol description]
拾像鏡頭 10 第一透鏡 11 第二透鏡 12 第三透鏡 13 第一表面 S1 第二表面 S2 第三表面 S3 第四表面 S4 第五表面 S5 第六表面 S6 物端 OBJ 像端 IMA 孔徑光闌 ST0 光軸 0A 17Pickup lens 10 First lens 11 Second lens 12 Third lens 13 First surface S1 Second surface S2 Third surface S3 Fourth surface S4 Fifth surface S5 Sixth surface S6 Object end OBJ Image end IMA Aperture stop ST0 Optical axis 0A 17