TWI326363B - Pickup image lens - Google Patents
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- TWI326363B TWI326363B TW95133921A TW95133921A TWI326363B TW I326363 B TWI326363 B TW I326363B TW 95133921 A TW95133921 A TW 95133921A TW 95133921 A TW95133921 A TW 95133921A TW I326363 B TWI326363 B TW I326363B
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1326363 型正透鏡’且其成像端表面朝向成像端凸出;以及第四透 鏡的物端表面朝向成像端凸出。 如以上所述,於本發明之拾像鏡頭必須滿足此條件: 0.1 < I —1<1 f4 其中’F為該拾像鏡頭的焦距值,以及f4為第四透鏡的焦 距值。.The 1326363 type positive lens 'and its imaging end surface is convex toward the imaging end; and the object end surface of the fourth lens is convex toward the imaging end. As described above, the pickup lens of the present invention must satisfy this condition: 0.1 < I - 1 < 1 f4 where 'F is the focal length value of the pickup lens, and f4 is the focal length value of the fourth lens. .
如以上所述’本發明之拾像鏡頭之第一、第三及第四 透鏡皆具有至少一非球面。 如以上所述,本發明之拾像鏡頭之孔鏡光闌位於第一 透鏡與第二透鏡之間。 如以上所述’本發明之第四透鏡之物端表面與成像端 表面進一步需滿足此條件: 0.05< RB-R7 Λ8 + R7 <0.8As described above, the first, third, and fourth lenses of the pickup lens of the present invention each have at least one aspherical surface. As described above, the aperture stop of the pickup lens of the present invention is located between the first lens and the second lens. As described above, the object end surface and the image forming end surface of the fourth lens of the present invention further satisfy this condition: 0.05 < RB - R7 Λ 8 + R7 < 0.8
其中,R7是第四透鏡之物端表面之曲率半徑,以及R8是 第四透鏡之成像端表面之曲率半徑。 如以上所述,本發明之拾像鏡頭之第二透鏡之物端表 面朝向成像端凸出。 本發明之優點在於,使用四牧透鏡,使得本發明之拾 像鏡頭具有長度短、重量輕的優點。較佳地,第一正透鏡 、第二負透鏡、第三正透鏡及第四透鏡皆可使用塑膠材料 製作。 本發明之另一優點在於,藉由孔鏡光闌設置於第—與 6 第二透鏡之間,使得拾像鏡頭具有廣視角。 【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 以下配合參考圓式之-個較佳實施例的詳細說明中將可 清楚的呈現。 本發明之拾像鏡頭可以應用於影像操取裝置,用來將 目標物成像於影像感測元件,如電荷耦合元件(charge C〇Upled Device簡稱CCD)或互補金屬氧化半導體元件 (CMOS)。該拾像鏡頭自物端至錢端依序包括具有正屈光 率的第-透鏡、具有負屈光率的第二透鏡、具有正屈光率 的第三透鏡及具有弱屈光率的第四透鏡。孔徑光閣設置於 第一透鏡與第二透鏡之間。第一、第三及第四透鏡皆具有 至少一非球面》 本發明之拾像鏡頭中,第一透鏡為一新月型正透鏡, 且其物端表面朝向物端凸出。第二透鏡為一負透鏡,其物 端表面係朝向成像端凸出。第三透鏡為一新月型正透鏡, 且其像端表面朝向成像端凸出。第四透鏡之物端表面係凹 向成像端,且其成像端表面係朝向成像端凸出。 於本發明中,拾像鏡頭必須滿足以下條件: 01<1^1<1……⑴ 其中’ F為拾像鏡頭的焦距值,f4為第四透鏡的焦距值。當 丨丨大於條件(1)的上限值時,拾像鏡頭之總長度會過長。 當丨F/f4|小於條件⑴的下限值時,拾像鏡頭之畸變像差 1326363 (distortion aberration)愈趨惡化而降低成像品質。 此外,本發明之第四透鏡之物端表面與成像端表面進 一步需滿足此條件: (2) °·05<Ι^<0·8 其中,R7是第四透鏡之物端表面之曲率半徑,以及R8是 第四透鏡之成像端表面之曲率半徑。當大於條件(2) R〇 + R7 之上限值時,將使得拾像鏡頭之系統像差愈趨惡化而降低 成像品質。當小於條件(2)之下限值時,將使得第 /?〇 + ΚΊ 四透鏡無法修補拾像鏡頭的像差。 〈發明詳細說明〉 參閱圖1,本發明之拾像鏡頭之實施例,該拾像鏡頭自 物端OBJ至成像端IMA依序包含正屈光率的第一透鏡G1 、負屈光率的第二透鏡G2、正屈光率的第三透鏡G3以及 弱屈光率的第四透鏡G4 ;以及,該拾像鏡頭的系統焦距長 度為F=5.30 mm,且Fno.=2.86。此外,孔徑光闌STO位於 第一透鏡G1與第二透鏡G2之間。 第一透鏡G1為一新月型正透鏡,自物端OBJ至成像端 IMA又分別包含第一表面L1與第二表面L2,鄰近物端 OBJ之第一表面L1朝向物端OBJ凸出。此外,第一表面 L1與第二表面L2皆為非球面。 第二透鏡G2為一負透鏡,鄰近物端OBJ之第三表面 8 1326363 L3必須朝向成像端IMA凸出。參閱圖1,於此實施例中, 第二透鏡G2為一雙凹透鏡,鄰近成像端IMA之第四表面 L4係朝向物端OBJ凸出。此外,第三表面L3與第四表面 L4皆為非球面。Wherein R7 is the radius of curvature of the object end surface of the fourth lens, and R8 is the radius of curvature of the imaging end surface of the fourth lens. As described above, the object end surface of the second lens of the pickup lens of the present invention is convex toward the image forming end. An advantage of the present invention is that the use of a four-grain lens makes the pickup lens of the present invention have the advantages of a short length and a light weight. Preferably, the first positive lens, the second negative lens, the third positive lens, and the fourth lens are all made of a plastic material. Another advantage of the present invention is that the aperture lens is disposed between the first and sixth second lenses such that the image pickup lens has a wide viewing angle. 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. The pickup lens of the present invention can be applied to an image manipulation device for imaging an object to an image sensing element such as a charge coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The pickup lens sequentially includes a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, and a third having a weak refractive power from the object end to the money end. Four lenses. The aperture light is disposed between the first lens and the second lens. The first, third, and fourth lenses each have at least one aspherical surface. In the pickup lens of the present invention, the first lens is a crescent-shaped positive lens, and the object end surface thereof is convex toward the object end. The second lens is a negative lens whose object end surface is convex toward the imaging end. The third lens is a crescent-shaped positive lens, and its image end surface is convex toward the imaging end. The object end surface of the fourth lens is concave toward the imaging end, and its imaging end surface is convex toward the imaging end. In the present invention, the pickup lens must satisfy the following conditions: 01 < 1^1 < 1 (1) where 'F is the focal length value of the pickup lens, and f4 is the focal length value of the fourth lens. When 丨丨 is greater than the upper limit of condition (1), the total length of the pickup lens will be too long. When 丨F/f4| is smaller than the lower limit value of the condition (1), the distortion aberration 1326363 (distortion aberration) of the pickup lens is deteriorated to deteriorate the image quality. In addition, the object end surface and the imaging end surface of the fourth lens of the present invention further satisfy this condition: (2) °·05<Ι^<0·8 where R7 is the radius of curvature of the object end surface of the fourth lens And R8 is the radius of curvature of the imaging end surface of the fourth lens. When it is greater than the upper limit of the condition (2) R 〇 + R7 , the system aberration of the pickup lens is deteriorated to deteriorate the image quality. When it is less than the lower limit of the condition (2), the /?〇 + ΚΊ four lens will not be able to repair the aberration of the pickup lens. DETAILED DESCRIPTION OF THE INVENTION Referring to Fig. 1, in an embodiment of the pickup lens of the present invention, the pickup lens includes a first lens G1 having a positive refractive power and a first negative refractive power from an object end OBJ to an imaging end IMA. The second lens G2, the third lens G3 of positive refractive power, and the fourth lens G4 of weak refractive power; and the system focal length of the pickup lens are F=5.30 mm, and Fno.=2.86. Further, the aperture stop STO is located between the first lens G1 and the second lens G2. The first lens G1 is a crescent-shaped positive lens, and the first surface L1 and the second surface L2 are respectively included from the object end OBJ to the imaging end IMA, and the first surface L1 of the adjacent object end OBJ protrudes toward the object end OBJ. Further, the first surface L1 and the second surface L2 are both aspherical. The second lens G2 is a negative lens, and the third surface 8 1326363 L3 adjacent to the object end OBJ must protrude toward the imaging end IMA. Referring to Fig. 1, in this embodiment, the second lens G2 is a double concave lens, and the fourth surface L4 adjacent to the imaging end IMA is convex toward the object end OBJ. Further, the third surface L3 and the fourth surface L4 are both aspherical.
第三透鏡G3為一新月型正透鏡,自物端OBJ至成像端 IMA又分別包含第五表面L5與第六表面L6,鄰近成像端 IMA之第六表面L6朝向成像端IMA凸出。此外,第五表 面L5與第六表面L6皆為非球面。 第四透鏡G4為一新月型透鏡,自物端OBJ至成像端 IMA又分別包含第七表面L7與第八表面L8,鄰近成像端 IMA之第八表面L8朝向成像端IMA凸出。此外,第七表 面L7與第八表面L8皆為非球面。The third lens G3 is a crescent-shaped positive lens, and the fifth end surface L5 and the sixth surface L6 are respectively included from the object end OBJ to the imaging end IMA, and the sixth surface L6 adjacent to the imaging end IMA protrudes toward the imaging end IMA. Further, the fifth surface L5 and the sixth surface L6 are both aspherical. The fourth lens G4 is a crescent lens, and the self-object end OBJ to the imaging end IMA further includes a seventh surface L7 and an eighth surface L8, respectively, and an eighth surface L8 adjacent to the imaging end IMA protrudes toward the imaging end IMA. Further, the seventh surface L7 and the eighth surface L8 are both aspherical.
於本發明之實施例中,拾像鏡頭的第一、第二、第三 及第四透鏡的各項參數依序列於表1中:In the embodiment of the present invention, the parameters of the first, second, third, and fourth lenses of the image pickup lens are listed in Table 1:
表1 系統焦距長度F=5.30 mm ; Fno. = 2.86 表面序號 曲率半徑(mm) 厚度(mm) 折射率(Nd) 阿貝係數(Vd) L1 1.930 1.3000 1.524708 56.209669 L2 5.310 0.1260 1.000000 STO Infinity 0.0960 1.000000 L3 -7.050 0.4500 1.632205 23.000000 L4 17 0.2100 1.000000 L5 -11.030 1.2100 1.524708 56.209669 L6 -1.500 1.0700 1.000000 L7 -0.870 1.0100 1.632205 23.000000 L8 -1.350 0.6513811 1.000000 P1 Infinity 0.4000 BK7 BK7 P2 Infinity 0.5000 1.000000 IMA 9 1326363 此外,本發明之實施例中,第一透鏡G1之第一表面 L1與第二表面L2、第二透鏡G2之第三表面L3與第四表面 L4、第三透鏡G3之第五表面L5與第六表面L6、以及第四 透鏡G4之第七表面L7與第八表面L8為非球面,其非球面Table 1 System focal length F = 5.30 mm ; Fno. = 2.86 Surface number Curvature radius (mm) Thickness (mm) Refractive index (Nd) Abbe's coefficient (Vd) L1 1.930 1.3000 1.524708 56.209669 L2 5.310 0.1260 1.000000 STO Infinity 0.0960 1.000000 L3 -7.050 0.4500 1.632205 23.000000 L4 17 0.2100 1.000000 L5 -11.030 1.2100 1.524708 56.209669 L6 -1.500 1.0700 1.000000 L7 -0.870 1.0100 1.632205 23.000000 L8 -1.350 0.6513811 1.000000 P1 Infinity 0.4000 BK7 BK7 P2 Infinity 0.5000 1.000000 IMA 9 1326363 Furthermore, an embodiment of the invention The first surface L1 and the second surface L2 of the first lens G1, the third surface L3 and the fourth surface L4 of the second lens G2, the fifth surface L5 and the sixth surface L6 of the third lens G3, and the fourth The seventh surface L7 and the eighth surface L8 of the lens G4 are aspherical, and the aspherical surface thereof
之相關數值依序列於表2 : 表2 表面 序號 K E4 E6 E8 L1 0.48 -0.0050392926 0.0021913456 -0.0014250465 L2 2.38 -0.00083352449 -0.0013718912 0.040188674 L3 -21.04757 -0.053546679 0.013717798 0.033175 L4 69.82262 -0.024292605 0.046017405 0.04088452 L5 92 -0.056554037 0.056145764 -0.042401596 L6 -0.4770624 0 -0.012896515 0.01564612 L7 -0.9245092 -0.037010503 0.073054406 -0.02508864 L8 -0.9410524 -0.011470449 0.0087493284 0.00013760692 表2 表面 序號 E10 E12 E14 L1 0.00037960031 0.0002 L2 -0.018302779 -0.035079705 L3 -0.067300787 -0.016831451 L4. -0.099223281 0.03857995 L5 0.056375505 -0.035149063 L6 -0.019007507 0.010899159 -0.0021977762 L7 0.0014034024 0.00060022254 L8 -0.00056919011 0.000063340851 根據表1,可得知弱屈光率的第4透鏡G4之焦距f4=-20.963,可得|F/f4|=0.253且確實符合條件(1)。 根據表1,可得知第4透鏡G4之第七表面L7的曲率 半徑R7 = -0.87 mm,第4透繞G4之第八表面L8的曲率半 徑 R8=-1.350 mm。將 R7 與 R8 代入 R8-R7 R8 + R7 可得 R8-R7 R8 + R7 10 1326363 0.216且確實符合條件(2)。 圖2顯示本發明之實施例之拾像鏡頭之球面像差 (Spherical aberration)。於瞳半徑為 0.9283 mm 之範圍内, 球面像差小於0.07 mm。 圖3顯示本發明之實施例之拾像鏡頭之場曲像差(Field Curvature)。於像場高度為2.9 mm之範圍内,子午面及弧 矢面的光線之場曲像差小於0.08 mm。 圖4顯示本發明之實施例之拾像鏡頭之畸變像差 (distortion aberration)。於像場高度為2.9 mm之範圍内,各 波長光線之畸變相差量皆小於0.15%範圍内。. 圖5顯示本發明之實施例之拾像鏡頭的光線像差(ray aberration,又稱 ray fans)。於像高度分別為 0·0 mm、1.8 mm、2.3 mm及2.9 mm時,該拾像鏡頭的光線像差仍維持 相當平坦。 由以上可知,本發明之實施例的拾像鏡頭具有極佳的 成像品質;雖然第一透鏡、第二透鏡、第三透鏡及第四透 鏡内皆使用塑膠射出成型的透鏡,但不受溫度變化而使成 像品質惡化。 參考圖1及表1,本發明之拾像鏡頭的孔徑光闌ST0 位於第一透鏡G1與第二透鏡G2之間。 惟以上所述者,僅為本發明之具體實施例而已,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。 11 1326363 【圖式簡單說明】 圖1概妻顯示本發明之實施例之拾像鏡頭之位置; 圖2顯示本發明之實施例之拾像鏡頭之球面像差; 圖3顯示本發明之實施例之拾像鏡頭之場曲像差; 圖4顯示本發明之實施例之拾像鏡頭之畸變像差; 圖5顯示本發明之實施例之拾像鏡頭的光線像差。The relevant values are listed in Table 2: Table 2 Surface No. K E4 E6 E8 L1 0.48 -0.0050392926 0.0021913456 -0.0014250465 L2 2.38 -0.00083352449 -0.0013718912 0.040188674 L3 -21.04757 -0.053546679 0.013717798 0.033175 L4 69.82262 -0.024292605 0.046017405 0.04088452 L5 92 -0.056554037 0.056145764 - 0.042401596 L6 -0.4770624 0 -0.012896515 0.01564612 L7 -0.9245092 -0.037010503 0.073054406 -0.02508864 L8 -0.9410524 -0.011470449 0.0087493284 0.00013760692 Table 2 Surface No. E10 E12 E14 L1 0.00037960031 0.0002 L2 -0.018302779 -0.035079705 L3 -0.067300787 -0.016831451 L4. -0.099223281 0.03857995 L5 0.056375505 -0.035149063 L6 -0.019007507 0.010899159 -0.0021977762 L7 0.0014034024 0.00060022254 L8 -0.00056919011 0.000063340851 According to Table 1, it can be seen that the focal length f4 of the 4th lens G4 with weak refractive power is -20.963, which can be obtained as |F/f4|=0.253 and indeed meets Condition (1). According to Table 1, it is understood that the radius of curvature R7 of the seventh surface L7 of the fourth lens G4 is -0.87 mm, and the radius of curvature of the eighth surface L8 of the fourth through-wound G4 is R8 = -1.35 mm. Substituting R7 and R8 into R8-R7 R8 + R7 yields R8-R7 R8 + R7 10 1326363 0.216 and does qualify (2). Fig. 2 shows the spherical aberration of the pickup lens of the embodiment of the present invention. The spherical aberration is less than 0.07 mm in the range of 0.9283 mm. Fig. 3 shows a field curvature of a pickup lens according to an embodiment of the present invention. In the range of the image field height of 2.9 mm, the field aberration of the light of the meridional plane and the sagittal plane is less than 0.08 mm. Fig. 4 shows the distortion aberration of the pickup lens of the embodiment of the present invention. In the range of the image field height of 2.9 mm, the distortion of each wavelength of light is less than 0.15%. Fig. 5 shows ray aberrations (also referred to as ray fans) of the pickup lens of the embodiment of the present invention. When the image height is 0·0 mm, 1.8 mm, 2.3 mm, and 2.9 mm, the astigmatism of the pickup lens remains fairly flat. As apparent from the above, the pickup lens of the embodiment of the present invention has excellent image quality; although the first lens, the second lens, the third lens, and the fourth lens all use a plastic injection molded lens, they are not subject to temperature changes. And the imaging quality is deteriorated. Referring to Fig. 1 and Table 1, the aperture stop ST0 of the pickup lens of the present invention is located between the first lens G1 and the second lens G2. The above is only the specific embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are all It is still within the scope of the invention patent. 11 1326363 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows the position of a pickup lens of an embodiment of the present invention; FIG. 2 shows a spherical aberration of an image pickup lens according to an embodiment of the present invention; FIG. 3 shows an embodiment of the present invention. Fig. 4 shows the distortion aberration of the pickup lens of the embodiment of the present invention; Fig. 5 shows the ray aberration of the pickup lens of the embodiment of the present invention.
【主要元件符號說明】 L1 第一表面 G1 * 第一透鏡 L2 · · · 第二表面 G2 · ' · 第二透鏡 L3 ·' 第三奉面 G3 · · 第三透鏡 L4 … 第四表面 G4 .. 第四透鏡 L5 · ‘ 第五表面 IMA ' · 成像端 L6 ·' 第六表面 STO 孔徑光闌 L7 · · · 第七表面 OBJ * · 物端 L8 .. 第八表面 0A ' * · 光轴 12[Description of main component symbols] L1 First surface G1 * First lens L2 · · · Second surface G2 · ' · Second lens L3 · ' Third surface G3 · · Third lens L4 ... Fourth surface G4 .. Fourth lens L5 · 'Fifth surface IMA ' · Imaging end L6 · 'Sixth surface STO aperture stop L7 · · · Seventh surface OBJ * · Object L8 .. Eighth surface 0A ' * · Optical axis 12
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