201219818 六、發明說明： 【發明所屬之技術領^ &妒顔。 [0001]本發明涉及一種镜頭，尤其涉及一種趙廣 、 【先前技術】 nn产以上，而採 [0002] 先前之車用超廣角鏡頭之梘角要求約在9 ^ 用超廣角鏡頭所擷取到之影像在螢幕上通常會有""„„ <會造成成像嚴 成像畸變。因此’如何言又計出視角廣瓦个 重畸變之超廣角鏡頭，已成為本技術領威工程技術人員 研究之方南。為了降低成像畸變，一般在超廣角鏡頭設 計過程中會採用非球面透鏡取代球面透鏡，但是，非球 面透鏡之生產成本較高，不利於節約生產成本。 【發明内容】 _有鑑於此，有必要提供—種投影品f高、成本低之超廣 角鏡頭。 [0004] —種超廣角鏡頭，其包括： [0005] -具有負光焦度之第一透鏡組，其由自物側至像侧依次 排列之一第一球面透鏡、一第二球面透鏡及—第三球面 透鏡，且該第一球面透鏡至第三球面透鏡依次為負光焦 度、負光焦度及正光焦度； _6] -具有正光焦度之第二透鏡組，其由自物側至像側依次 排列之—第四球面透鏡及-第五球面透鏡，且該第四球 面透鏡和第五球面透鏡依次為正光焦度和負光焦度； [0007]所述超廣角鏡頭滿足以下條件式： [0008] 0.01 < D/ ! FG1 | < j , 0992066238-0 099138021 表單煸號A0101 第4頁/共18頁 201219818 [0009] 2 < D/FG2 < 4 ； [0010] 其中，D為第一球面透鏡之物侧表面至超廣角鏡頭之成 面沿光轴方向上之距離，FG1為第一透鏡级之有力文隹 FG2為第二透鏡組之有效焦、距。 [0011] 與先前技術相比，本發明所述超廣角鏡頭在其尺寸較 之情況下仍保證超廣角鏡頭總長與球差之間之平衡，， 而獲得較好之投影品質。 Q [0012] 【實施方式】 下面將結合附圖與實施例對本技術方案作進—步詳李 明》 ° [0013] 請參閱圖1，其為本發明實施方式所提供之—超廣角# 1 00用於將位於物側之一物體成像於像側之成像面其中 在所述超廣角鏡頭100之像側設置一影像感測元件2〇〇以 擷取成像於像侧之成像面之影像。所述像側之成像面為 影像感測元件2 0 0之感測面。 〇 [0014] 所述超廣角鏡頭10Θ從物侧至像側依次包括一具有負光隹 度之第一逸鏡組10及一具有正光焦度之第二透鏡組2〇。 所述第一透鏡組10從物側至像側依次包括一第一球面透 鏡11、一第二球面透鏡12及一第三球面透鏡13，且該第 一球面透鏡11至第三球面透鏡13依次為負光焦度、負光 焦度及正光焦度。所述第二透鏡組20從物側至像侧依次 包括一第四球面透鏡21及一第五球面透鏡22，且該第四 球面透鏡21和第五球面透鏡22依次為正光焦度和負光焦 度。所述第三球面透鏡13與第四球面透鏡21之間具有一 099138021 表單編號A0101 第5頁/共18頁 0992066238-0 201219818 光圈30。 [0015] 該超廣角鏡頭100滿足以下條件式： [0016] (1) 0. 01 < D/IFG1 | < 1 ;及（2) 2 < D/FG2 < 4。 [0017] 其中，D為第一球面透鏡11之物側表面至超廣角鏡頭100 之成像面沿光軸方向上之距離，FG1為第一透鏡組10之有 效焦距，FG2為第二透鏡組20之有效焦距。 [0018] 條件式（1)使得超廣角鏡頭100擁有較大之視角，同時保 證了超廣角鏡頭100之小型化。再者，第一球面透鏡11至 第三球面透鏡13依次為負光焦度、負光焦度及正光焦度 之設計能有效減小球差及畸變之程度，以提升超廣角鏡 頭100之光學特性。 [0019] 條件式（2)有效修正了超廣角鏡頭100之球差。 [0020] 優選地，超廣角鏡頭100還滿足以下條件： [0021] (3) 0. 25 < 1/FG1 + 1/FG2 < 0. 45 ； [0022] 其中，1/FG1為所述第一透鏡組10之屈光度，1/FG2為所 述第二透鏡組20之屈光度。條件式（3)使得第一透鏡組10 和第二透鏡組20之屈光度較小，可使各鏡片製造敏感度 較低，降低生產成本，並易於修改橫向色差以及像面彎 曲。 [0023] 優選地，超廣角鏡頭100還滿足以下條件： [0024] (4) 0· 1 < t4/D < 0. 3， (5) 0.2 < t4/Ds <0.6 099138021 表單編號A0101 第6頁/共18頁 0992066238-0 [0025] 201219818 • [0026] (6) 0. 3 < 1/FL4< 0. 5 ； [0027] 其中，t4為所述第四球面透鏡21在光軸方向上之肉厚， Ds為光圈30至成像面之距離，1/FL4為所述第四球面透 鏡21之屈光度。條件式（4)〜（6)保證超廣角鏡頭100之總 長，有利於其小型化。 [0028] 優選地，超廣角鏡頭100還滿足以下條件：201219818 VI. Description of the invention: [Technology collar of the invention ^ & Yan Yan. [0001] The present invention relates to a lens, and more particularly to a Zhao Guang, [prior art] nn production, and the [0002] previous automotive super wide-angle lens corner requirements are about 9 ^ with a super wide-angle lens The image will usually have ""> on the screen, which will cause image distortion. Therefore, “how to say and count the wide-angle lens with a wide angle of view and distortion, has become the research of the technology of the leading engineering and technical personnel. In order to reduce the imaging distortion, an aspherical lens is generally used in place of the spherical lens in the design of the super wide-angle lens. However, the production cost of the aspherical lens is high, which is not conducive to saving production costs. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide an ultra-wide angle lens with high projection cost and low cost. [0004] A super wide-angle lens, comprising: [0005] a first lens group having a negative refractive power, wherein one of a first spherical lens, a second spherical lens, and a first lens are arranged from the object side to the image side. a third spherical lens, wherein the first to third spherical lenses are negative power, negative power, and positive power; _6] - a second lens group having positive power, which is from the object side a fourth spherical lens and a fifth spherical lens are sequentially arranged to the image side, and the fourth spherical lens and the fifth spherical lens are positive refractive power and negative refractive power in sequence; [0007] the super wide-angle lens satisfies the following conditions Formula: [0008] 0.01 < D/ ! FG1 | < j , 0992066238-0 099138021 Form nickname A0101 Page 4 / Total 18 pages 201219818 [0009] 2 < D/FG2 <4; [0010] D is the distance from the object side surface of the first spherical lens to the plane of the super wide-angle lens along the optical axis, and FG1 is the effective lens FG2 of the first lens level as the effective focal length and distance of the second lens group. [0011] Compared with the prior art, the super wide-angle lens of the present invention ensures the balance between the total length of the super wide-angle lens and the spherical aberration under the condition of the size, and obtains better projection quality. [Embodiment] Hereinafter, the present technical solution will be further described in conjunction with the accompanying drawings and embodiments. [0013] Please refer to FIG. 1 , which is provided by an embodiment of the present invention—super wide angle # 1 00 is for imaging an object located on the object side on the image side of the image side, wherein an image sensing element 2 is disposed on the image side of the super wide-angle lens 100 to capture an image of the imaging surface imaged on the image side. The image side of the image side is a sensing surface of the image sensing element 200. [0014] The super wide-angle lens 10 includes, in order from the object side to the image side, a first lens group 10 having a negative light intensity and a second lens group 2 having a positive power. The first lens group 10 includes a first spherical lens 11 , a second spherical lens 12 and a third spherical lens 13 in order from the object side to the image side, and the first spherical lens 11 to the third spherical lens 13 are sequentially It is negative power, negative power and positive power. The second lens group 20 includes a fourth spherical lens 21 and a fifth spherical lens 22 in order from the object side to the image side, and the fourth spherical lens 21 and the fifth spherical lens 22 are positive refractive power and negative light in sequence. Power. There is a 099138021 between the third spherical lens 13 and the fourth spherical lens 21. Form No. A0101 Page 5 of 18 0992066238-0 201219818 Aperture 30. [0015] The super wide-angle lens 100 satisfies the following conditional formula: [0016] (1) 0. 01 < D/IFG1 | <1; and (2) 2 < D/FG2 < 4. [0017] wherein D is the distance from the object side surface of the first spherical lens 11 to the imaging surface of the super wide-angle lens 100 along the optical axis direction, FG1 is the effective focal length of the first lens group 10, and FG2 is the second lens group 20 Effective focal length. The conditional expression (1) allows the super wide-angle lens 100 to have a large viewing angle while ensuring miniaturization of the super wide-angle lens 100. Furthermore, the design of the negative spherical power, the negative refractive power and the positive refractive power of the first spherical lens 11 to the third spherical lens 13 can effectively reduce the spherical aberration and the distortion to improve the optical characteristics of the super wide-angle lens 100. . [0019] Conditional Formula (2) effectively corrects the spherical aberration of the super wide-angle lens 100. [0020] Preferably, the super wide-angle lens 100 further satisfies the following condition: [0021] (3) 0. 25 < 1/FG1 + 1/FG2 < 0. 45; [0022] wherein 1/FG1 is the first The diopter of a lens group 10, 1/FG2 is the diopter of the second lens group 20. The conditional expression (3) makes the diopter of the first lens group 10 and the second lens group 20 small, makes the lens manufacturing sensitivity low, reduces the production cost, and easily modifies the lateral chromatic aberration as well as the image plane curvature. [0023] Preferably, the super wide-angle lens 100 further satisfies the following conditions: [0024] (4) 0·1 < t4/D < 0. 3, (5) 0.2 < t4/Ds <0.6 099138021 Form No. A0101 Page 6 of 18 0992066238-0 [0025] 201219818 • [0026] (6) 0. 3 <1/FL4< 0. 5; [0027] wherein t4 is the fourth spherical lens 21 in the light The flesh in the axial direction is thick, Ds is the distance from the aperture 30 to the imaging surface, and 1/FL4 is the refracting power of the fourth spherical lens 21. Conditional formulas (4) to (6) ensure the total length of the super wide-angle lens 100, which is advantageous for miniaturization thereof. [0028] Preferably, the super wide-angle lens 100 also satisfies the following conditions:
ο [0030] 其中，η5為所述第五球面透鏡22折射率之d線折射率。所 述第五球面透鏡22之面型為凹凸新月型，在條件式（7)之 保證下，使第五球面透鏡22屈光度較大，並且可以達到 較高之像高，以及較小之畸變特徵。 [0031] 優選地，超廣角鏡頭100還滿足以下條件： [0032] (8) -4 < FL1/F0 < -2， ' Λ , ' [0033] (9) 370< |FG1 |/F0 < 3前 ❹ [0034] (10) 2 < FG2/F0 < 4 ；： [0035] 其中，FL1為所述第一球面透鏡11之有效焦距，F0為整個 超廣角鏡頭100之有效焦距。條件式（8)保證了超廣角鏡 頭100之超廣角要求，可確保大角度之光線可有效會聚， 同時保證小型化之要求。條件式（9)~( 10)使得超廣角鏡 頭100之球差和畸變易於修正。 [0036] 優選地，超廣角鏡頭100還滿足以下條件： ， [0037] (11) nl>l. 75， 099138021 表單編號Α0101 第7頁/共18頁 0992066238-0 201219818 [0038] (12) y 2> 65， [0039] (13) n3>l. 84， [0040] (14) v3<25， [0041] (15) n5>l. 92， [0042] (16) i>5<20; [0043] 其中，ni、n3、心分別為所述第一、第三、第五球面透 鏡11、13、22折射率之d線折射率，V2、u3、2^5為第 二、第三、第五球面透鏡12、13、22之何貝數。條件式 . .. (11 )~(16)保證了大角度之光線可有效會聚。 [0044] 本實施方式中，超廣角鏡頭1〇〇之各光學元件滿足表 條件，其中，D=12. 50mm ; FGl=-563mm ; FG2 = 3. 30mm ；t4=l. 959mm ； Ds=5.085mm ； FL4=2.350mm ； FLl=-4.30mm ; F0=1.48mm。 [0045] 表1中，R為對應表面之曲率丰a，D為對灰表面到後一個 表面之轴上距離（兩個表面截得光軸之長度），Nd為對應 透鏡組對d光（波長為587納米，下同）之折射率（下同）， vd為d光在對應透鏡組之阿貝數（abbe nuraber，下同） 〇 [0046] 表 1 [0047] 表面 透鏡表 R(mm) D(mm) Nd Vd 面 S1 球面 11.505 0. 825 1. 77 47. 8 S2 球面 2. 466 1. 678 表單編號A0101 第8頁/共18頁 0992066238-0 099138021 201219818[0030] wherein η5 is a d-line refractive index of the refractive index of the fifth spherical lens 22. The surface shape of the fifth spherical lens 22 is a concave-convex crescent type, and under the guarantee of the conditional expression (7), the fifth spherical lens 22 has a large diopter, and can achieve a higher image height and a smaller distortion. feature. [0031] Preferably, the super wide-angle lens 100 further satisfies the following condition: [8] (8) -4 < FL1/F0 < -2, ' Λ , ' [0033] (9) 370< |FG1 |/F0 < 3 ❹ [0034] (10) 2 < FG2/F0 <4;: [0035] where FL1 is the effective focal length of the first spherical lens 11, and F0 is the effective focal length of the entire super wide-angle lens 100. Conditional (8) guarantees the ultra-wide angle requirement of the super wide-angle lens 100, ensuring that large angles of light can be effectively concentrated while ensuring miniaturization. The conditional expressions (9) to (10) make the spherical aberration and distortion of the super wide-angle lens head 100 easy to correct. [0036] Preferably, the super wide-angle lens 100 further satisfies the following conditions: [0037] (11) nl>1. 75, 099138021 Form number Α0101 Page 7/18 pages 0992066238-0 201219818 [0038] (12) y 2> 65, [0039] (13) n3 > l. 84, [0040] (14) v3 < 25, [0041] (15) n5 > 92, [0042] (16) i > 5 <20; Wherein, ni, n3, and core are the d-line refractive indices of the refractive indices of the first, third, and fifth spherical lenses 11, 13, 22, respectively, and V2, u3, and 2^5 are second and third. The number of the fifth spherical lenses 12, 13, 22. Conditional formula . . . (11)~(16) ensures that large angles of light can be effectively concentrated. [0044] In this embodiment, each optical component of the super wide-angle lens 1满足 satisfies the table condition, wherein D=12.50mm; FGl=-563mm; FG2=3.30mm; t4=l. 959mm; Ds=5.085mm ; FL4 = 2.350 mm; FLl = - 4.30 mm; F0 = 1.48 mm. [0045] In Table 1, R is the curvature of the corresponding surface a, D is the distance from the gray surface to the latter surface (the length of the optical axis of the two surfaces), and Nd is the corresponding lens group pair d light ( The wavelength is 587 nm, the same as the refractive index (the same below), vd is the Abbe number of the d-light in the corresponding lens group (abbe nuraber, the same below) 〇 [0046] Table 1 [0047] Surface lens table R (mm D(mm) Nd Vd Face S1 Spherical 11.505 0. 825 1. 77 47. 8 S2 Spherical 2. 466 1. 678 Form No. A0101 Page 8 of 18 0992066238-0 099138021 201219818
—_J_—ί I I 6 本實施方式中，超廣^角鏡頭1QI之各光學元 A^L· * 圭 O rf» . Ο /、从 i，Λ Λ _ 、- . Λ · Ο 條件，表2中’ 2ω為超廣角鏡頭loo之視場角；FN〇為超 廣角鏡頭100之光圈數。 [0048]表 2 [0049] 視場角2 ω 174 ..-：3 ^ ""：：,% ώ S S. ·' ΰ 光圈數FNo 2.5 f\ -.!!p! --- 本實施方式之超廣角鏡頭100中，其球差、場曲畸變及崎 變分別如圖2到圖4所示。圖2中，分別為針對波長為 546nm而觀察到之球差值曲線。總體而言，本實施方式之 超廣角鏡頭100對可見光（波長範圍在400nm- 70〇nm之 間）產生之球差值控制在（-〇.〇6mm，0.06mm)範圍内。圖 3中，曲線T及S分別為子午場曲（tangential field curvature)特性曲線及弧矢場曲（sagittal field curvature)特性曲線（下同），子午場曲值和弧矢場曲值 被控制在（0, 0.06mm)範圍内。圖4中，曲線為畸變特性 099138021 表單編號A0101 第9頁/共18頁 0992066238-0 201219818 曲線’畸變量被控制在（一50%，0)範_。由此可見，超 廣角鏡頭1GG之球差、場曲、畸變都能被控制（修正）在較 小之範圍内。 _] m述超廣_頭丨叫其尺寸較小之情況下仍健超廣角 鏡頭100總長與球差之間之平衡，從而獲得較好之投影口。 質。 一 [0051] 綜上所述，本發明確已符合發明專利之要件，遂依法提 出專利申請。惟，以上所述者僅為本發明之較佳實施方 式，自不能以此限制本案之申請專利範圍。舉凡熟悉本 案技藝之人士援依本發明之精神所作之等效修飾或變化 ，皆應涵蓋於以下申請專利範圍内》 【圖式簡單說明】 [0052] 圖1為本發明實施方式提供之超廣角鏡頭之結構示意圖。 [0053] 圖2為圖1中之超廣角鏡頭之球差圖。 [0054] 圖3為圖1中之超廣角鏡頭之場曲圖。 [〇〇55] 圖4為圖1中之超廣角鏡頭之畸變壽。 【主要元件符號說明】 [0056] 超廣角鏡頭100 [0057] 第一透鏡組10 [0058] 第一球面透鏡11 [0059] 第二球面透鏡12 [0060] 第三球面透鏡1 3 099138021 表單編號A0101 第10頁/共18頁 0992066238-0 201219818 [0061] 第二透鏡組20 [0062] 第四球面透鏡21 [0063] 第五球面透鏡22 [0064] 光圈 30 [0065] 影像感測元件200 [0066] 表面 S1-S11—_J_— ί II 6 In this embodiment, each optical element of the ultra-wide angle lens 1QI A^L·* 圭O rf» . Ο /, from i, Λ Λ _, - . Λ · Ο condition, Table 2 Medium '2ω is the angle of view of the super wide-angle lens loo; FN〇 is the number of apertures of the super wide-angle lens 100. [0048] Table 2 [0049] Field of view 2 ω 174 ..-:3 ^ ""::,% ώ S S. ·' ΰ Aperture number FNo 2.5 f\ -.!!p! --- In the super wide-angle lens 100 of the present embodiment, spherical aberration, curvature of field distortion, and roughness are shown in FIGS. 2 to 4, respectively. In Fig. 2, the spherical aberration curves observed for the wavelength of 546 nm, respectively. In general, the spherical aberration value of the super wide-angle lens 100 of the present embodiment for visible light (wavelength ranging from 400 nm to 70 〇 nm) is controlled within the range of (-〇.〇6 mm, 0.06 mm). In Fig. 3, the curves T and S are the tangential field curvature characteristic curve and the sagittal field curvature characteristic curve (the same below), and the meridional field curvature value and the sagittal field curvature value are controlled at (0). , 0.06mm). In Fig. 4, the curve is the distortion characteristic. 099138021 Form No. A0101 Page 9 of 18 0992066238-0 201219818 The curve 'distortion variable is controlled at (a 50%, 0) _. It can be seen that the spherical aberration, field curvature and distortion of the super wide-angle lens 1GG can be controlled (corrected) within a small range. _] m said super wide _ head 丨 其 其 其 其 其 其 其 其 其 其 其 其 其 其 其 其 仍 仍 仍 仍 仍 仍 仍 仍 仍 仍 仍 仍 。 。 。 。 。 。 。 quality. [0051] In summary, the present invention has indeed met the requirements of the invention patent, and the patent application is filed according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. The equivalent modifications or variations made by those skilled in the art to the spirit of the present invention should be covered by the following claims. [FIG. 1] FIG. 1 is a super wide-angle lens provided by an embodiment of the present invention. Schematic diagram of the structure. 2 is a spherical aberration diagram of the super wide-angle lens of FIG. 1. 3 is a field curvature diagram of the super wide-angle lens of FIG. 1. [〇〇55] Figure 4 is the distortion life of the super wide-angle lens of Figure 1. [Main Component Symbol Description] [0056] Ultra Wide Angle Lens 100 [0057] First Spherical Lens 11 [0058] Second Spherical Lens 12 [0060] Third Spherical Lens 1 3 099138021 Form No. A0101 10 pages/18 pages 0992066238-0 201219818 [0061] Second lens group 20 [0062] Fifth spherical lens 21 [0063] Fifth spherical lens 22 [0064] Aperture 30 [0065] Image sensing element 200 [0066] Surface S1-S11
D 099138021 表單編號A0101 第11頁/共18頁 0992066238-0D 099138021 Form No. A0101 Page 11 of 18 0992066238-0