200909906 •. 九、發明說明： 【發明所屬之技術領域】 本發明涉及成像技術，特別涉及一種成像鏡頭。 【先前技術】 近年來’隨著半導體技術之發展，應用於成像系統之 影像感測器’如電荷耦合器(Charge c〇upled Device，CCD) , 或補充性半導體（Complementary Metal Oxide200909906 • Description of the Invention: [Technical Field] The present invention relates to imaging technology, and more particularly to an imaging lens. [Prior Art] In recent years, with the development of semiconductor technology, image sensors applied to imaging systems such as Charge Coupled Devices (CCDs) or Complementary Metals (Complementary Metal Oxides)
Semiconductor，CMOS)裝置’在提高像素之同時，朝小型化 方向發展’以此滿足消費者對成像系統之成像品質及便攜 性之要求。 對應地，成像鏡頭需提高解析度、縮小尺寸，以配合 影像感測H組成高成像品f、小尺寸之成像系統。 【發明内容】 有雲於此，有必要提供一種高解析度、小尺寸之成像 , 鏡頭。 -種成像鏡頭，其從物_像側依次包括：具有正光 焦度之第-鏡片、具有負光焦度之第二鏡片、具有正光焦 度之第一鏡片及具有負光焦度之第四鏡片。該成像鏡頭滿 - 足條件式： - 0.5<F1/F<1; R6>R5>R7>0。 焦距’ R5, R6 及 R7 200909906 徑、該第三鏡片之像側表面曲率半徑及該第四鏡片之物側 表面曲率半徑。 條件式：0.5<F1/F<1用於縮短成像鏡頭全長(成像鏡頭 第一個光學面到成像面之距離），避免產生過於嚴重之球差 (spherical aberration)。條件式：R6>R5>R7>0 用於修正場曲 (field curvature)及畸變(distortion)。綜前，可得到高解析度、 小尺寸之成像鏡頭。 【實施方式】 請參閱圖1，本發明實施例之成像鏡頭1〇〇從物側到 像側依次包括具有正光焦度之第一鏡片10、具有負光焦度 之第二鏡片20、具有正光焦度之第三鏡片3〇及具有負光 焦度之第四鏡片40。 成像鏡頭100成像時，光線自物側入射成像鏡頭100， 依次經第一鏡片10、第二鏡片20、第三鏡片30及第四鏡 片40後會聚(成像)於成像面99。設置CCD或CMOS之感 測面（圖未示)於成像面99處便可組成成像系統。 為得到高解析度、小尺寸之成像鏡頭iOO，成像鏡頭 100滿足條件式： (1) 0.5<F1/F<1; (2) R6>R5>R7>〇 〇 其中’ F1及F分別為第一鏡片10及成像鏡頭1〇〇之 有效焦距，R5，R6及R7分別為第三鏡片30之物側表面曲 率半徑、第三鏡片30之像側表面曲率半徑及第四鏡片40 之物侧表面曲率半徑。 200909906 條件式(1)給出第一鏡片10之光焦度(1/F1)與成像鏡頭 100之光焦度(1/F)之關係，以限制成像鏡頭全長，並控制 球差。滿足F1/F<1已可得到較短之後焦距，進而得到較短 之成像鏡頭全長’考慮到F1/F過小將導致第一鏡片之光焦 度過大’產生較嚴重之球差，為將球差控制在可修正之範 圍内，故另限制〇.5<Fl/F。 另外’由於第一鏡片1〇設置於成像鏡頭1〇〇外侧，為 避免第一鏡片10蒙塵刮花，優選地，第一鏡片10採用玻 璃材料製成(採用色散小之玻璃材料還可降低色差(chr〇nic aberration))，限制〇.5<fi/f，利於減小玻璃鏡片之曲率半 徑’進而減低玻璃鏡片研磨之難度，提高生產率，降低成 本。 條件式(2)通過限定曲率半徑r5，R6及R7之關係，限 定第三鏡片30之物側表面、第三鏡片30之像侧表面及第 四鏡片40之物侧表面之光焦度關係，利於修正場曲及崎 變。若不滿足條件式(2)限定之條件，將產生較大之場曲及 畸變。 優選地，成像鏡頭100還滿足條件式： (3) 0.3<R1/F<0.6。 其中’ R1為弟一鏡片1〇物側表面之曲率半裡。 條件式(3)給出曲率半徑R1與成像鏡頭有效焦距ρ之 關係，以進一步縮短成像鏡頭全長，並降低鏡片之製造成 本。滿足Rl/F<0.6可縮短成像鏡頭全長，然而R1/F過小， 導致第一鏡片10之物側表面過曲，鏡片不易研磨，增加製 200909906 造成本。 較優地，成像鏡頭100還滿足條件式： (4) D1>D12。 其中’ D1為第一鏡片10軸上厚度(第一鏡片截得 光轴之長度）’D12為第一鏡片10與第二鏡片2〇之軸上間 距(第一鏡片10與第二鏡片20相對兩個表面截得光軸之長 度)。 ' 條件式(4)給出第一鏡片10軸上厚度di與第一鏡片1〇 與第二鏡片20軸上間距D12之關係，以限制軸上間距 D12 ’進一步縮短成像鏡頭全長。 更優地’成像鏡頭100還滿足條件式： (5) 0.3<R7/F<0.6。 條件式(5)給出曲率半徑R7與成像鏡頭有效焦距F之 關係，以正確修正場曲及畸變。具體地，R7/F越小，第四 鏡片40之物侧表面越曲，越有利於修正場曲及畸變，然 而，第四鏡片40之物侧表面過曲，將產生球差，故限定 〇.3<R7/F<0.6。 具體地，成像鏡頭100還包括設置於第一鏡片1〇物側 之光闌96(aperturestop)。光闌96可限制軸外光線進入成像 鏡頭1〇〇而產生較嚴重之畸變及場曲。將光闌96設置於第 一鏡片10物側有利於縮短成像鏡頭全長。為節約成本，縮 短成像鏡頭全長，可採用不透光材料塗佈第-鏡片10物側 表面外圈，充當光闌96。可以理解，光闌96如此設置還 有利於縮短成像鏡頭全長。 200909906 另一方面，為修正色差， 係式： (6) vd2<35。 還限定成像鏡頭100滿足關 下同)在第二鏡 其中，vd2為d光(波長為587·6奈米 片2〇之阿貝數(abbe number)。 可以理解，為節約成本，實施例之第二鏡片％、第三 鏡片3〇及第四鏡片4〇採用歸材料製成(如射出成型，利 於量產）。 更加具體地’成像醜1()()成_，光線還可能經過 設置於成像鏡頭1G0像侧之紅外濾W 9啊麗d咖纽㈣ 及用於保護影像感測n之賴朗97(e_giass)。 以下結合圖2至圖1Q，以具體實施例進-步說明成像 鏡頭100。具體實施例中，第二鏡片2〇、第三鏡片3〇及第 四鏡片4〇之兩個表面都採用非球面（第—鏡片1〇採用球面 鏡）。 以鏡片表面中心為原點，光軸為X軸，鏡片表面之非 球面面型運算式為： _ ch2 其中，C為鏡面表面中心之曲率，k係二次曲面係數， 、為仗光轴到鏡片表面之高度，Σ#表示對Ajhi 累加，1為自然數，Ai為第i階之非球面面型係數。 另外’約定FN。為成像鏡頭100之光圈數，2ω為成像 鏡頭100之視場角，R為對應表面之曲率半徑，D為對應 10 200909906 '表面到後一個表面之軸上距離（兩個表面截得光轴之長 度），Nd為對應鏡片（或濾光片）對d光之折射率，vd為d 光在對應鏡片（或濾光片）之阿貝數。 實施例1 實施例1之成像鏡頭100滿足表1及表2所列之條件， 且 F=3.92 毫米(millimeter，mm)，FNo=2.81，2ω =62°。 表1 表面 R (mm) D (mm) Nd vd 第一鏡片物側 表面 2.31 0.847 1.712108 47.5931 第一鏡片像侧 表面 -14.247 0.17 - - 第二鏡片物侧 表面 -3.366 0.4 1.6182 33.25 第二鏡片像侧 表面 3.172 0.226 - - 第三鏡片物侧 表面 2.166 1.08 1.48749 70.4058 第三鏡片像侧 表面 6.03 0.271 - - 第四鏡片物侧 表面 1.504 0.807 1.501886 57.8648 第四鏡片像侧 表面 1.69 0.303 - - 11 200909906 紅外濾光片物 侧表面 無窮大 0.4 1.5168 64.167336 紅外濾光片像 侧表面 無窮大 0.38 - - 保護玻璃物側 表面 無窮大 0.4 1.5254 62.2 保護玻璃像侧 表面 無窮大 0.045 - - 成像面 無窮大 - - - 表2 表面 表面非球面面型參數 ^ 一 hiu 弟一鏡 k=3.501179; A4=0.023559128; 片物侧 A6=-0.002593523; A8=0.038117856; 表面 A10=-0.028808062 弟一鏡 k=-17.3214; A4=0.027675108; 片像侧 • A6=-0.012911835; 表面 A8=0.01197666;A10=-0.005756877 第三鏡 k=-0.221474; 片物側 A4=-0.034887552;A6=-0.00150474; 表面 A8=0.011051003; A10=-0.007390695 弟二鏡 k=-375.9149; A4=-0.039205129; 片像侧 A6=0.027253846; A8=0.000321871; 表面 A10=-0.002197873 第四鏡 k=-7.818869; A4=-0.041467361; 12 200909906 片物側 A6=-0.023813467; A8=0.003913267; 表面 A10=0.000376873 第四鏡 k=-4.057894; A4=-0.032579818; 片像側 A6=-0.003090331; A8=0.000612299; 表面 A10=-0.000058434 表面 表面非球面面型參數 第二鏡 k=3.501179; A4=0.023559128; 片物侧 A6=-0.002593523; A8=0.038117856; 表面 A10=-0.028808062 實施例1之成像鏡頭100之球差特性曲線、場曲特性 曲線及畸變之特性曲線分別如圖2、圖3及圖4所示。圖2 中，曲線g，d及c分別為g光(波長為435.8奈米，下同）、 d光及c光(波長為656.3奈米，下同)於成像鏡頭1〇〇之球 差特性曲線(下同）。可見’實施例1之成像鏡頭1〇〇對可見 光(400-700奈米）產生之球差被控制在-〇.〇4mm〜0.04mm 間。圖3中’曲線't及s為子午場曲(tangential field curvature) 特性曲線及弧矢場曲(sagittal field curvature )特性曲線(下 同）。可見，子午場曲值及弧矢場曲值被控制在 -〇.〇3mm〜0.03mm間。圖4中，曲線為畸變特性曲線(下同）。 可見，畸變量被控制在-2.5%〜2.5%間。綜前，儘管成像鏡 頭100尺寸縮小，其產生之球差、場曲及畸變卻被控制(修 正)在較小之範圍内。 實施例2 實施例2之成像鏡頭1〇〇滿足表3及表4所列之條件， 13 200909906 ’ 且 F=4.15mm，FNo=2.81，2ω=58.66°。 表3 表面 R (mm) D (mm) Nd vd 第一鏡片 物侧表面 2.051949 0.7893953 1.66457 1.532955 第一鏡片 像侧表面 -23.80611 0.168 - - 第二鏡片 物側表面 -4.420939 0.412 53.007 58.7808 哲一蜂U 弟—鏡月 像側表面 5.161281 0.3882785 - - 弟二鏡月 物側表面 2.390057 0.9950179 1.755201 1.5168 第三鏡片 像侧表面 6.23 0.3716246 - - 第四鏡片 物側表面 1.492706 0.61 27.5795 64.167336 弟四鏡片 像侧表面 1.210031 0.2726837 - - 紅外濾光 片物側表 面 無窮大 0.4 1.522955 1.5254 紅外遽光 片像側表 無窮大 0.4 - - 14 200909906 面 保護玻璃 物侧表面 無窮大 0.4 56.7808 62.2 保護玻璃 像侧表面 無窮大 0.045 - - 成像面 無窮大 - - - 表4 表面 表面非球面面型參數 第二鏡 k=5.299543; A4=0.018697801; 片物側 A6=-0.015907763; A8=0.051188023; 表面 A10=-0.028565258 第二鏡 k=-34.71912; A4=0.017099189; 片像側 A6=-0.003149201; A8=0.010375968; 表面 A10=-0.000344777 第三鏡 k=0.05804339; A4=-0.031059564; 片物側 A6=0.005336067; A8=-0.000623211; 表面 A10=-0.001836084 弟二鏡 k=-507.4565; A4=-0.029563257; 片像侧 A6=0.025098551; A8 = -0.004930792; 表面 A10=0.000148468 第四鏡 k=-10.52922; A4=-0.11210867; 片物侧 A6=-0.02505039; A8=0.009855853; 表面 A10=0.000250909 實施例2之成像鏡頭100之球差特性曲線、場曲特性 15 200909906 曲線及畸變之特性曲線分別如圖5、圖6及圖7所示。圖5 中’可見光產生之球差被控制在-〇.28mm〜〇.28mm間。圖6 中’子午場曲值及弧矢場曲值被控制在_〇.〇3mm〜〇.〇3mm 間。圖7中，畸變量被控制在-2.5%〜2.5%間。綜前，儘管 成像鏡頭100尺寸縮小，其產生之球差、場曲及畸變卻被 控制(修正)在較小之範圍内。 實施例3 實施例3之成像鏡頭1〇〇滿足表5及表6所列之條件， 且 F=4mm，Fn〇=2.81 ’ 2ω=59·8。 表5 表面 R (mm) D (mm) Nd vd 第一鏡片 物侧表面 2.123546 0.78 1.623474 1.682358 第一鏡片 像侧表面 28.2113 0.33 - - 第二鏡片 物側表面 -4.757207 0.429 59.714 59.2779 第二鏡片 像侧表面 4.240722 0.2577253 - - 弟三鏡片 物側表面 2.214957 0.9263359 1.614704 1.5168 弟三鏡片 像側表面 7.789406 0.4725472 - - 第四鏡片 1.985617 0.6493842 27.9172 64.167336 16 200909906 物侧表面 第四鏡片 像側表面 1.638365 0.2414074 - - 紅外濾光 片物侧表 面 無窮大 0.4 1.611878 1.5254 紅外濾光 片像侧表 面 無窮大 0.4 - - 保護玻璃 物側表面 無窮大 0.4 58.9068 62.2 保護玻璃 像侧表面 無窮大 0.045 - - 成像面 無窮大 - - - 表6 表面 表面非球面面型參數 第二鏡 k=8.14288; A4=0.014506305; 片物側 A6=-0.017555848; A8=0.051788575; 表面 A10=-0.023408154 第二鏡 k=-26.61209; A4=0.007997176; 片像侧 A6=-0.007909534; A8=0.013856641; 表面 A10=-0.000457476 弟二鏡 k=0.1300091; A4=-0.030413837; 片物側 A6=0.005130393; A8=-0.000676437; 17 200909906 表面 A10=-0.001037712 第三鏡 k=15.94523; A4=-0.0313252; 片像側 A6=0.026198077; A8=-0.004926366; 表面 A10=-0.000691028 第四鏡 k=-6.570329; A4=-0.065912929; 片物側 A6=-0.029375799; A8=0.009638573; 表面 A10=-0.000299699 實施例3之成像鏡頭100之球差特性曲線、場曲特性 曲線及畸變之特性曲線分別如圖8、圖9及圖10所示。圖 8中，可見光產生之球差被控制在-〇.18mm〜0.18mm間。圖 9中，子午場曲值及弧矢場曲值被控制在-〇.〇3mm〜〇.〇3mm 間。圖10中，畸變量被控制在-2.5%~2.5%間。綜前，儘管 成像鏡頭100尺寸縮小，其產生之球差、場曲及畸變卻被 控制(修正)在較小之範圍内。 本發明之成像鏡頭滿足條件式：0.5<F1/F<1，縮短成 像鏡頭全長’避免產生過於嚴重之球差。條件式： R6>R5>R7>0用於修正場曲及畸變。綜前，可得到高解析 度、小尺寸之成像鏡頭。 綜上所述，本發明確已符合發明專利要件，爰依法提 出專利申請。惟，以上所述者僅為本發明之較佳實施方式， 舉凡熟悉本案技藝之人士，於援依本案發明精神所作之等 效修飾或變化，皆應包含於以下之申請專利範圍内。 【圖式簡單說明】 圖1為本發明實施例之成像鏡頭之系統構成示意圖。 18 200909906 • ® 2為本發明實施例i之成像鏡頭之球差特性曲線圖。 圖3為本發明實施例1之成像鏡頭之場曲特性曲線圖。 圖4為本發明實施例丄之成像鏡頭之崎變特性曲線圖。 圖5為本發明實施例2之成像鏡頭之球差特性曲線圖。 圖6為本發明實施例2之成像鏡頭之場曲特性曲線圖。 圖7為本發明實施例2之成像鏡頭之畸變特性曲線圖。 圖8為本發明實施例3之成像鏡頭之球差特性曲線圖。 圖9為本發明實施例3之成像鏡頭之場曲特性曲線圖。 圖10為本發明實施例3之成像鏡頭之畸變特性曲線圖。 【主要組件符號說明】 成像鏡頭 100 成像面 99 第一鏡片 10 紅外濾光片 98 弟二鏡片 20 保護玻璃 97 苐三鏡片 30 光闌 96 第四鏡片 40 19The semiconductor, CMOS device "develops in the direction of miniaturization while increasing the pixel" to meet consumer demand for imaging quality and portability of the imaging system. Correspondingly, the imaging lens needs to be improved in resolution and reduced in size to match the image sensing H to form a high imaging product, a small size imaging system. SUMMARY OF THE INVENTION In view of this, it is necessary to provide a high-resolution, small-sized imaging and lens. An imaging lens comprising, in order from the object image side, a first lens having positive power, a second lens having negative power, a first lens having positive power, and a fourth having negative power lens. The imaging lens is full - full conditional: - 0.5 < F1/F <1; R6 > R5 > R7 > The focal lengths 'R5, R6 and R7 200909906, the radius of curvature of the image side surface of the third lens and the radius of curvature of the object side surface of the fourth lens. Conditional formula: 0.5 < F1/F < 1 is used to shorten the full length of the imaging lens (the distance from the first optical surface of the imaging lens to the imaging surface) to avoid excessively serious spherical aberration. Conditional expression: R6 > R5 > R7 > 0 is used to correct field curvature and distortion. In advance, high-resolution, small-sized imaging lenses are available. [Embodiment] Referring to FIG. 1, an imaging lens 1 according to an embodiment of the present invention includes, in order from the object side to the image side, a first lens 10 having positive refractive power, a second lens 20 having negative refractive power, and positive light. The third lens 3 of the power and the fourth lens 40 having the negative power. When the imaging lens 100 is imaged, the light enters the imaging lens 100 from the object side, and then passes through the first lens 10, the second lens 20, the third lens 30, and the fourth lens 40 to be concentrated (imaged) on the imaging surface 99. A sensing surface (not shown) of the CCD or CMOS is disposed at the imaging surface 99 to form an imaging system. In order to obtain a high-resolution, small-sized imaging lens iOO, the imaging lens 100 satisfies the conditional expression: (1) 0.5 < F1/F <1; (2) R6 > R5 > R7 > 〇〇 where 'F1 and F are respectively The effective focal lengths of the first lens 10 and the imaging lens 1 are R5, R6 and R7 are the radius of curvature of the object side surface of the third lens 30, the radius of curvature of the image side surface of the third lens 30, and the object side of the fourth lens 40, respectively. Surface radius of curvature. 200909906 Conditional Formula (1) gives the relationship between the power (1/F1) of the first lens 10 and the power (1/F) of the imaging lens 100 to limit the total length of the imaging lens and control the spherical aberration. Satisfying F1/F<1 can get a shorter back focal length, and then get a shorter full length of the imaging lens. Considering that F1/F is too small will cause the first lens to have too much power, resulting in a more serious spherical aberration. The difference control is within the correctable range, so the limit is 〇5 < Fl/F. In addition, since the first lens 1 is disposed outside the imaging lens 1 , in order to prevent the first lens 10 from being dusted, preferably, the first lens 10 is made of a glass material (the use of a small dispersion of glass material can also reduce the chromatic aberration) (chr〇nic aberration)), limiting 〇.5<fi/f, which is advantageous for reducing the radius of curvature of the glass lens', thereby reducing the difficulty of polishing the glass lens, improving productivity, and reducing cost. The conditional expression (2) defines the optical power relationship of the object side surface of the third lens 30, the image side surface of the third lens 30, and the object side surface of the fourth lens 40 by defining the relationship of the curvature radii r5, R6 and R7. Conducive to correct field music and changes. If the condition defined by conditional expression (2) is not satisfied, a large field curvature and distortion will occur. Preferably, the imaging lens 100 also satisfies the conditional expression: (3) 0.3 < R1/F < 0.6. Where 'R1 is the radius of curvature of the side surface of the lens 1 of the lens. The conditional expression (3) gives the relationship between the radius of curvature R1 and the effective focal length ρ of the imaging lens to further shorten the total length of the imaging lens and reduce the manufacturing cost of the lens. Satisfying Rl/F<0.6 can shorten the total length of the imaging lens, however, the R1/F is too small, causing the object side surface of the first lens 10 to be excessively curved, and the lens is not easy to be ground, thereby increasing the system 200909906. Preferably, the imaging lens 100 also satisfies the conditional expression: (4) D1 > D12. Wherein 'D1 is the thickness of the first lens 10 on the axis (the length of the first lens intercepted optical axis) 'D12 is the on-axis spacing of the first lens 10 and the second lens 2 (the first lens 10 is opposite to the second lens 20) Both surfaces are cut to the length of the optical axis). The conditional expression (4) gives the relationship between the thickness di of the first lens 10 on the axis and the axial distance D12 of the first lens 1 〇 and the second lens 20 to limit the on-axis spacing D12 'to further shorten the total length of the imaging lens. More preferably, the imaging lens 100 also satisfies the conditional expression: (5) 0.3 < R7/F < 0.6. Conditional formula (5) gives the relationship between the radius of curvature R7 and the effective focal length F of the imaging lens to correct the curvature of field and distortion. Specifically, the smaller the R7/F is, the more curved the object side surface of the fourth lens 40 is, which is more favorable for correcting field curvature and distortion. However, the object side surface of the fourth lens 40 is excessively curved, which will cause spherical aberration, so it is limited to 〇. .3<R7/F<0.6. Specifically, the imaging lens 100 further includes an aperture stop 96 disposed on the side of the first lens 1. The aperture 96 limits the off-axis light into the imaging lens 1 to produce more severe distortion and curvature of field. Setting the diaphragm 96 to the object side of the first lens 10 is advantageous for shortening the entire length of the imaging lens. In order to save cost and shorten the overall length of the imaging lens, the outer surface of the object side surface of the first lens 10 may be coated with an opaque material to serve as the aperture 96. It can be understood that the arrangement of the aperture 96 is also advantageous for shortening the full length of the imaging lens. 200909906 On the other hand, to correct the chromatic aberration, the system: (6) vd2 < 35. It is also defined that the imaging lens 100 satisfies the same) in the second mirror, and vd2 is the d-light (abbe number of the wavelength of 587·6 nanometer sheet 2). It can be understood that, in order to save cost, the embodiment The second lens %, the third lens 3 〇 and the fourth lens 4 〇 are made of a material (such as injection molding, which is advantageous for mass production). More specifically, 'imaging ugly 1 () () into _, the light may also be set The infrared filter W 9 on the image side of the imaging lens 1G0, and the e_giass for protecting the image sensing n. The following describes the imaging in a specific embodiment with reference to FIG. 2 to FIG. The lens 100. In the specific embodiment, the two surfaces of the second lens 2, the third lens 3, and the fourth lens 4 are aspherical (the first lens is a spherical mirror). The center of the lens surface is taken as the origin. The optical axis is the X-axis, and the aspherical surface of the lens surface is: _ ch2 where C is the curvature of the center of the mirror surface, k is the quadric coefficient, and is the height of the pupil axis to the surface of the lens, Σ# Indicates that Ajhi is accumulated, 1 is a natural number, and Ai is the aspherical surface coefficient of the i-th order. The FN is the number of apertures of the imaging lens 100, 2ω is the angle of view of the imaging lens 100, R is the radius of curvature of the corresponding surface, and D is the corresponding axis 10 200909906 'the distance from the surface to the back surface (the two surfaces are intercepted The length of the optical axis), Nd is the refractive index of the corresponding lens (or filter) to d light, and vd is the Abbe number of the d-light in the corresponding lens (or filter). Embodiment 1 Imaging lens of Embodiment 1 100 satisfies the conditions listed in Tables 1 and 2, and F = 3.92 mm (millimeter, mm), FNo = 2.81, 2ω = 62 °. Table 1 Surface R (mm) D (mm) Nd vd First lens side Surface 2.31 0.847 1.712108 47.5931 First lens image side surface - 14.247 0.17 - - Second lens object side surface - 3.366 0.4 1.6182 33.25 Second lens image side surface 3.172 0.226 - - Third lens object side surface 2.136 1.08 1.48749 70.4058 Third lens Image side surface 6.03 0.271 - - Fourth lens side surface 1.504 0.807 1.501886 57.8648 Fourth lens image side surface 1.69 0.303 - - 11 200909906 Infrared filter side surface infinity 0.4 1.5168 64.167336 Infrared filter image side surface infinity Large 0.38 - - Protective glass side surface infinity 0.4 1.5254 62.2 Protective glass side surface infinity 0.045 - - Imaging surface infinity - - - Table 2 Surface surface aspherical surface parameters ^ One hiu brother one mirror k = 3.501179; A4 = 0.223559128 ; sheet side A6=-0.002593523; A8=0.038117856; surface A10=-0.028808062 brother one mirror k=-17.3214; A4=0.027675108; sheet image side • A6=-0.012911835; surface A8=0.01197666; A10=-0.005756877 third Mirror k=-0.221474; sheet side A4=-0.034887552; A6=-0.00150474; surface A8=0.011051003; A10=-0.007390695 second mirror k=-375.9149; A4=-0.039205129; slice side A6=0.027253846; A8= 0.000321871; Surface A10=-0.002197873 Fourth mirror k=-7.818869; A4=-0.041467361; 12 200909906 Side of the sheet A6=-0.023813467; A8=0.003913267; Surface A10=0.000376873 Fourth mirror k=-4.057894; A4=-0.032579818 ; image side A6=-0.003090331; A8=0.000612299; surface A10=-0.000058434 surface surface aspherical surface parameter second mirror k=3.501179; A4=0.023559128; sheet side A6=-0.002593523; A8=0.038117856; surface A10 =-0.02880806 2 The spherical aberration characteristic curve, the field curvature characteristic curve and the distortion characteristic curve of the imaging lens 100 of the first embodiment are as shown in Figs. 2, 3 and 4, respectively. In Fig. 2, the curves g, d and c are the spherical aberration characteristics of the imaging lens 1 g light (wavelength 435.8 nm, the same below), d light and c light (wavelength 656.3 nm, the same below). Curve (the same below). It can be seen that the spherical aberration produced by the imaging lens 1 of Example 1 against visible light (400-700 nm) is controlled between -〇.〇4 mm to 0.04 mm. The 'curve' and s in Fig. 3 are the tangential field curvature characteristic curve and the sagittal field curvature characteristic curve (the same applies hereinafter). It can be seen that the meridional field curvature value and the sagittal field curvature value are controlled between -〇.〇3mm~0.03mm. In Fig. 4, the curve is a distortion characteristic curve (the same applies hereinafter). It can be seen that the distortion variable is controlled between -2.5% and 2.5%. In all, although the size of the imaging lens 100 is reduced, the spherical aberration, field curvature and distortion generated are controlled (corrected) to a small extent. Example 2 The imaging lens 1 of Example 2 satisfies the conditions listed in Tables 3 and 4, 13 200909906 ' and F = 4.15 mm, FNo = 2.81, 2ω = 58.66 °. Table 3 Surface R (mm) D (mm) Nd vd First lens side surface 2.051949 0.7893953 1.66457 1.532955 First lens image side surface -23.80611 0.168 - - Second lens object side surface -4.420939 0.412 53.007 58.7808 Zheyi bei U —Mirror image side surface 5.161281 0.3882785 - - Second mirror moon surface side 2.390057 0.9950179 1.755201 1.5168 Third lens image side surface 6.23 0.3716246 - - Fourth lens object side surface 1.492706 0.61 27.5795 64.167336 Brother four lens image side surface 1.210031 0.2726837 - - Infrared filter side surface infinity 0.4 1.522955 1.5254 Infrared smear image side table infinity 0.4 - - 14 200909906 Face protection glass side surface infinity 0.4 56.7808 62.2 Protective glass image side surface infinity 0.045 - - Imaging surface infinity - - - Table 4 Surface surface aspherical surface parameters second mirror k = 5.299543; A4 = 0.018697801; sheet side A6 = -0.015907763; A8 = 0.051188023; surface A10 = -0.028565258 second mirror k = -34.71912; A4 = 0.017099189; Image side A6=-0.003149201; A8=0.010375968; surface A10=-0.000344777 third k=0.05804339; A4=-0.031059564; sheet side A6=0.005336067; A8=-0.000623211; surface A10=-0.001836084 二二镜k=-507.4565; A4=-0.029563257; sheet image side A6=0.025098551; A8 = -0.004930792 ; Surface A10=0.000148468 Fourth mirror k=-10.52922; A4=-0.11210867; Sheet side A6=-0.02505039; A8=0.009855853; Surface A10=0.000250909 The spherical aberration characteristic curve and field curvature characteristic of the imaging lens 100 of Example 2 15 200909906 The curve and distortion characteristic curves are shown in Figure 5, Figure 6 and Figure 7, respectively. In Fig. 5, the spherical aberration generated by the visible light is controlled between -〇28mm~〇.28mm. In Fig. 6, the 'merine field curvature value and the sagittal field curvature value are controlled between _〇.〇3mm~〇.〇3mm. In Figure 7, the distortion is controlled between -2.5% and 2.5%. In advance, although the size of the imaging lens 100 is reduced, the spherical aberration, field curvature and distortion generated are controlled (corrected) to a small extent. Example 3 The imaging lens 1 of Example 3 satisfies the conditions listed in Tables 5 and 6, and F = 4 mm, Fn 〇 = 2.81 ' 2 ω = 59 · 8. Table 5 Surface R (mm) D (mm) Nd vd First lens side surface 2.123546 0.78 1.623474 1.682358 First lens image side surface 28.21.113 0.33 - - Second lens object side surface - 4.757207 0.429 59.714 59.2779 Second lens image side surface 4.240722 0.2577253 - - Younger lens side surface 2.214957 0.9263359 1.614704 1.5168 Younger lens side surface 7.789406 0.4725472 - - Fourth lens 1.985617 0.6493842 27.9172 64.167336 16 200909906 Object side surface Fourth lens image side surface 1.638365 0.2414074 - - Infrared filter Infinity surface infinity 0.4 1.611878 1.5254 Infrared filter image side surface infinity 0.4 - - Protective glass side surface infinity 0.4 58.9068 62.2 Protective glass image side surface infinity 0.045 - - Imaging surface infinity - - - Table 6 Surface surface aspherical surface Parameter second mirror k=8.14288; A4=0.014506305; sheet side A6=-0.017555848; A8=0.051788575; surface A10=-0.023408154 second mirror k=-26.61209; A4=0.007997176; slice side A6=-0.007909534; =0.013856641; Surface A10=-0.000457476 弟二镜k=0.13 00091; A4=-0.030413837; sheet side A6=0.005130393; A8=-0.000676437; 17 200909906 surface A10=-0.001037712 third mirror k=15.94523; A4=-0.0313252; sheet image side A6=0.026198077; A8=-0.004926366; Surface A10=-0.000691028 Fourth mirror k=-6.570329; A4=-0.065912929; sheet side A6=-0.029375799; A8=0.009638573; surface A10=-0.000299699 The spherical aberration characteristic curve and field curvature of the imaging lens 100 of Example 3 The characteristic curves of the characteristic curve and the distortion are shown in Figs. 8, 9, and 10, respectively. In Fig. 8, the spherical aberration generated by visible light is controlled between -18 mm and 0.18 mm. In Fig. 9, the meridional curvature value and the sagittal curvature value are controlled between -〇.〇3mm~〇.〇3mm. In Figure 10, the distortion is controlled between -2.5% and 2.5%. In advance, although the size of the imaging lens 100 is reduced, the spherical aberration, field curvature and distortion generated are controlled (corrected) to a small extent. The imaging lens of the present invention satisfies the conditional formula: 0.5 < F1/F < 1, shortening the full length of the imaging lens' to avoid excessively serious spherical aberration. Conditional formula: R6 > R5 > R7 > 0 is used to correct field curvature and distortion. In advance, high-resolution, small-size imaging lenses are available. In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above-mentioned embodiments are merely preferred embodiments of the present invention, and those skilled in the art will be able to incorporate the equivalent modifications or variations of the present invention in the spirit of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing the system configuration of an imaging lens according to an embodiment of the present invention. 18 200909906 • ® 2 is a spherical aberration characteristic diagram of the imaging lens of the embodiment i of the present invention. Fig. 3 is a graph showing the field curvature characteristics of the imaging lens of Embodiment 1 of the present invention. 4 is a graph showing the saturation characteristics of an imaging lens according to an embodiment of the present invention. Fig. 5 is a graph showing the spherical aberration characteristic of the imaging lens of Example 2 of the present invention. Fig. 6 is a graph showing the field curvature characteristics of the imaging lens of Embodiment 2 of the present invention. Fig. 7 is a graph showing distortion characteristics of an imaging lens according to Embodiment 2 of the present invention. Fig. 8 is a graph showing the spherical aberration characteristic of the imaging lens of Example 3 of the present invention. Fig. 9 is a graph showing the field curvature characteristics of the imaging lens of Embodiment 3 of the present invention. Figure 10 is a graph showing the distortion characteristics of an imaging lens according to Embodiment 3 of the present invention. [Main component symbol description] Imaging lens 100 Imaging surface 99 First lens 10 Infrared filter 98 Second lens 20 Protective glass 97 Three lenses 30 Light 阑 96 Fourth lens 40 19