TWI407181B - Imaging lens - Google Patents
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Abstract
Description
本發明涉及一種取像鏡頭。 The invention relates to an image taking lens.
隨著科技之不斷發展,電子產品不斷地朝向輕薄短小以及多功能之方向發展,而電子產品中,如數碼相機、電腦等已具備取像裝置之外,甚至移動電話或個人數位輔助器(PDA)等裝置也有加上取像裝置之需求;而為了攜帶方便及符合人性化之需求,取像裝置需要具有良好之成像品質。 With the continuous development of technology, electronic products are constantly moving towards light, short, and versatile. In electronic products, such as digital cameras and computers, there are already imaging devices, even mobile phones or personal digital assistants (PDAs). The device also needs to have an image capturing device; and for the convenience of carrying and the demand for humanization, the image capturing device needs to have good image quality.
而由於傳統之球面研磨玻璃鏡片之材質選擇性較多,且對於修正色差較為有利,已廣為業界所使用,但球面研磨玻璃鏡片應用在數值孔徑(F Number)較小以及視角(Wide-angle)較大之情況時,像差之修正較困難。而為了改善上述傳統之球面研磨玻璃鏡片之缺點,目前之取像裝置已有使用非球面塑膠鏡片或使用非球面模造玻璃片,以獲得較佳之成像品質,但上述取像裝置之鏡頭長度過大,使取像裝置無法具有較小體積或較低成本,不易滿足電子產品輕薄短小之要求。 Because the traditional spherical grinding glass lens has more material selectivity and is more favorable for correcting chromatic aberration, it has been widely used in the industry, but the spherical grinding glass lens is applied to the numerical aperture (F Number) and the viewing angle (Wide-angle). When the larger case is, the correction of the aberration is more difficult. In order to improve the shortcomings of the above-mentioned conventional spherical grinding glass lens, the current image capturing device has used an aspherical plastic lens or an aspherical molded glass plate to obtain a better image quality, but the lens length of the above imaging device is too large. The image capturing device cannot be made to have a small volume or a low cost, and it is difficult to meet the requirements of light and thin electronic products.
有鑒於此,有必要提供一種尺寸小且成像品質佳之取像鏡頭。 In view of this, it is necessary to provide an image taking lens that is small in size and excellent in image quality.
一種取像鏡頭,其自物端到像端依次包括第一透鏡、第二透鏡、及第三透鏡,所述第一透鏡及所述第二透鏡均具有正光焦度,所述第三透鏡具有負光焦度;所述第一 ,第二及第三透鏡之各光學表面均為非球面;其中,所述第一透鏡滿足以下條件式:(|G1R2|-G1R1)/(|G1R2|+G1R1)<0.5,0.2<G1R1/F<0.6,1<F1/F<1.5,1<F/G3R2<7,0.5<h/D3<0.7,其中,G1R1為第一透鏡之物端表面之曲率半徑,G1R2為第一透鏡之像端表面之曲率半徑,F為取像鏡頭之總焦距,F1為第一透鏡之焦距,G3R2為第三透鏡之像端表面之曲率半徑,h為第三透鏡之像端表面之水準最高點之垂直高度,D3為第三透鏡之像端表面之有效徑高度。 An image taking lens comprising a first lens, a second lens, and a third lens from the object end to the image end, wherein the first lens and the second lens each have a positive power, and the third lens has Negative power; each optical surface of the first, second, and third lenses is aspherical; wherein the first lens satisfies the following condition: (| G 1 R 2|- G 1 R 1) /(| G 1 R 2|+ G 1 R 1)<0.5,0.2< G 1 R 1/ F <0.6,1< F 1/ F <1.5,1< F / G 3 R 2<7,0.5< h / D 3<0.7, wherein G1R1 is the radius of curvature of the object end surface of the first lens, G1R2 is the radius of curvature of the image end surface of the first lens, F is the total focal length of the image taking lens, and F1 is the first lens The focal length, G3R2 is the radius of curvature of the image end surface of the third lens, h is the vertical height of the highest level of the image end surface of the third lens, and D3 is the effective diameter height of the image end surface of the third lens.
較於先前,所述第一,第二及第三透鏡之各光學表面均為非球面,且第一鏡片滿足上述公式,因此不需要設置足夠長之空間來設置更多之鏡片以矯正像差,從而可減小鏡頭之鏡片數目,縮減取像鏡頭之長度並且提高取像鏡頭之成像品質。 Compared with the prior art, the optical surfaces of the first, second and third lenses are all aspherical, and the first lens satisfies the above formula, so there is no need to set a space long enough to set more lenses to correct the aberrations. Therefore, the number of lenses of the lens can be reduced, the length of the image taking lens can be reduced, and the image quality of the image taking lens can be improved.
請參閱圖1,為本發明取像鏡頭100之結構示意圖。所述取像鏡頭100,由物端至像端依次包括:一個第一透鏡10、一個第二透鏡20、一個第三透鏡30及一個影像感測器40,並以同一光軸X依序排列。取像時,光線係先經過第 一透鏡10後,再依次經過第二透鏡20,第三透鏡30,而成像於影像感測器40之感測面41上,而獲得清晰成像,其中影像感測器40為CCD(Charge Coupled Device,電荷耦合器件)或CMOS(Complementary Metal Oxide Semiconductor,互補式金屬氧化物半導體)。 Please refer to FIG. 1 , which is a structural diagram of the image taking lens 100 of the present invention. The image capturing lens 100 includes, in order from the object end to the image end, a first lens 10, a second lens 20, a third lens 30, and an image sensor 40, which are sequentially arranged by the same optical axis X. . When taking images, the light passes through the first After the lens 10, the second lens 20 and the third lens 30 are sequentially imaged on the sensing surface 41 of the image sensor 40 to obtain clear imaging. The image sensor 40 is a CCD (Charge Coupled Device). , charge coupled device) or CMOS (Complementary Metal Oxide Semiconductor).
所述第一透鏡10為新月型結構,其具有正光焦度,並且其包括朝向物端之第一物端表面11及朝向像端之第一像端表面12,所述第一像端表面12呈凹面。 The first lens 10 is a crescent-shaped structure having positive refractive power, and includes a first object end surface 11 facing the object end and a first image end surface 12 facing the image end, the first image end surface 12 is concave.
所述第二透鏡20為新月型結構,其具有正光焦度,並且其包括朝向物端之第二物端表面21及朝向像端之第二像端表面22,所述第二物端表面21呈凹面。 The second lens 20 is a crescent-shaped structure having positive refractive power, and includes a second object end surface 21 facing the object end and a second image end surface 22 facing the image end, the second object end surface 21 is concave.
所述第三透鏡30具有負光焦度,並且其包括朝向物端之第三物端表面31及朝向像端之第三像端表面32,所述第三像端表面32呈凹面。 The third lens 30 has a negative power and includes a third object end surface 31 facing the object end and a third image end surface 32 facing the image end, the third image end surface 32 being concave.
所述第一透鏡10之第一物端表面11及第一像端表面12,第二透鏡20之第二物端表面21及第二像端表面22,第三透鏡30之第三物端表面31及第三像端表面32均為非球面。因此不需要設置足夠長之空間來設置更多之鏡片以矯正像差,從而減小了取像鏡頭100之鏡片數目,縮減取像鏡頭100之長度。 a first object end surface 11 and a first image end surface 12 of the first lens 10, a second object end surface 21 and a second image end surface 22 of the second lens 20, and a third object end surface of the third lens 30 Both the 31 and the third image end surface 32 are aspherical. Therefore, it is not necessary to provide a sufficiently long space to set more lenses to correct the aberration, thereby reducing the number of lenses of the image taking lens 100 and reducing the length of the image taking lens 100.
本發明取像鏡頭100之第一透鏡10滿足以下條件式:(1)(|G1R2|-G1R1)/(|G1R2|+G1R1)<0.5 The first lens 10 of the image taking lens 100 of the present invention satisfies the following conditional formula: (1) (| G 1 R 2| - G 1 R 1) / (| G 1 R 2| + G 1 R 1) < 0.5
(2)0.2<G1R1/F<0.6 (2) 0.2< G 1 R 1/ F <0.6
其中,G1R1為第一透鏡10之第一物端表面11之曲率半徑,G1R2為第一透鏡10之第一像端表面12之曲率半徑,F為取像鏡頭100之總焦距。條件式(1)及條件(2)之限制了第一鏡片10之結構及位置,可改善取像透鏡100之球差及慧差,提高取像鏡頭100之成像品質。 Wherein, G1R1 is the radius of curvature of the first object end surface 11 of the first lens 10, G1R2 is the radius of curvature of the first image end surface 12 of the first lens 10, and F is the total focal length of the image taking lens 100. The conditional expressions (1) and (2) limit the structure and position of the first lens 10, improve the spherical aberration and coma aberration of the image taking lens 100, and improve the image quality of the image taking lens 100.
為了更好之提高取像鏡頭100之成像品質,該取像鏡頭100之第一透鏡10及第三透鏡30需進一步滿足以下條件式:(3)1<F1/F<1.5 In order to improve the imaging quality of the image taking lens 100, the first lens 10 and the third lens 30 of the image taking lens 100 further satisfy the following conditional formula: (3) 1 < F 1 / F < 1.5
(4)1<F/G3R2<7 (4)1< F / G 3 R 2<7
(5)0.5<h/D3<0.7 (5)0.5< h / D 3<0.7
其中,F1為第一透鏡10之焦距,G3R2為第三透鏡30之第三像端表面32之曲率半徑,h為第三透鏡30之第三像端表面32之水準最高點之垂直高度,D3為第三透鏡30之第三像端表面32之有效徑高度。 Wherein F1 is the focal length of the first lens 10, G3R2 is the radius of curvature of the third image end surface 32 of the third lens 30, and h is the vertical height of the highest level of the third image end surface 32 of the third lens 30, D3 It is the effective diameter height of the third image end surface 32 of the third lens 30.
為了使取像鏡頭100之成像品質與色差之間取得平衡點,第三透鏡30需更進一步滿足以下條件式:(6)-1<F*F3/Vd3<0 In order to achieve a balance between the imaging quality and the chromatic aberration of the image taking lens 100, the third lens 30 needs to further satisfy the following conditional formula: (6)-1< F * F3 / Vd3 <0
其中,F3為第三透鏡之焦距,Vd3為第三透鏡之阿貝數。 Wherein F3 is the focal length of the third lens, and Vd3 is the Abbe number of the third lens.
以下列舉三個較佳實施方式,並分別說明: Three preferred embodiments are listed below and are illustrated separately:
下列表(一)中列有由物端依序編號之光學面號碼(Surface #)、光軸上各透鏡之光學表面之曲率半徑(R)、沿光軸從物端到像端各面與其鄰近之後一光學表面之間距(D)、與鏡片材質之折射率(nd)和阿貝數(Vd)。 In the following list (1), the optical surface number (Surface #) numbered sequentially by the object end, the radius of curvature (R) of the optical surface of each lens on the optical axis, and the surface from the object end to the image end along the optical axis are listed. The distance between the optical surfaces (D) after the proximity, the refractive index (nd) of the lens material, and the Abbe number (Vd).
非球面係數表列如下:
該第一實施方式之取像鏡頭100中,其球差、場曲及畸變分別如圖2至圖4所示。圖2中,分別針對f線(波長值 435.8nm),d線(波長值587.6nm),c線(波長值656.3nm)而觀察到之球差值。總體而言,第一實施方式之取像鏡頭100對可見光(波長範圍在400nm-700nm之間)產生之球差值在(-0.05mm,0.05mm)範圍內。圖3中之S(子午場曲值)和T(弧矢場曲值)均控制在(-0.05mm,0.05mm)範圍內。圖4中之畸變率控制在(-1%,1%)範圍內。由此可見,取像鏡頭100之像差、場曲、畸變都能被很好校正。 In the image taking lens 100 of the first embodiment, spherical aberration, curvature of field, and distortion are shown in FIGS. 2 to 4, respectively. In Figure 2, for the f line (wavelength value) 435.8 nm), d-line (wavelength value 587.6 nm), c-line (wavelength value 656.3 nm) and the spherical difference observed. In general, the image pickup lens 100 of the first embodiment produces a spherical aberration value in the visible light (wavelength ranging from 400 nm to 700 nm) in the range of (-0.05 mm, 0.05 mm). In Fig. 3, S (meridian curvature value) and T (radial field curvature value) are both controlled within the range of (-0.05 mm, 0.05 mm). The distortion rate in Fig. 4 is controlled within the range of (-1%, 1%). It can be seen that the aberration, field curvature and distortion of the image taking lens 100 can be well corrected.
下列表(三)中列有由物端依序編號之光學面號碼(Surface #)、光軸上各透鏡之光學表面之曲率半徑(R)、沿光軸從物端到像端光軸上各面與其鄰近之後一光學表面之間距(D)、與鏡片材質之折射率(nd)和阿貝數(Vd)。 In the following list (3), the optical surface number (Surface #) sequentially numbered by the object end, the radius of curvature (R) of the optical surface of each lens on the optical axis, and the optical axis from the object end to the image end optical axis are listed. The distance between the optical surfaces (D) after the faces are adjacent to each other, the refractive index (nd) of the lens material, and the Abbe number (Vd).
非球面係數表列如下:表(四)
該第二實施方式中之取像鏡頭100中,其球差、場曲及畸變分別如圖5到圖7所示。圖5中,分別針對f線(波長值435.8nm),d線(波長值587.6nm),c線(波長值656.3nm)而觀察到之球差值。總體而言,第二實施方式之取像鏡頭100對可見光(波長範圍在400nm-700nm之間)產生之球差值在(-0.05mm,0.05mm)範圍內。圖6中之S(子午場曲值)和T(弧矢場曲值)均控制在(-0.05mm,0.05mm)範圍內。圖7中之畸變率控制在(-1%,1%)範圍內。由此可見,取像鏡頭100之像差、場曲、畸變都能被很好校正。 In the image taking lens 100 of the second embodiment, spherical aberration, curvature of field, and distortion are shown in FIGS. 5 to 7, respectively. In Fig. 5, spherical aberration values were observed for the f line (wavelength value 435.8 nm), the d line (wavelength value 587.6 nm), and the c line (wavelength value 656.3 nm). In general, the taking lens 100 of the second embodiment produces a spherical aberration value in the visible light (wavelength ranging from 400 nm to 700 nm) in the range of (-0.05 mm, 0.05 mm). In S (the meridional field curvature value) and T (the sagittal field curvature value) in Fig. 6, both are controlled within the range of (-0.05 mm, 0.05 mm). The distortion rate in Fig. 7 is controlled within the range of (-1%, 1%). It can be seen that the aberration, field curvature and distortion of the image taking lens 100 can be well corrected.
下列表(五)中列有由物端依序編號之光學面號碼(Surface #)、光軸上各透鏡之光學表面之曲率半徑(R)、沿光軸從物端到像端光軸上各面與其鄰近之後一光學表面之間距(D)、與鏡片材質之折射率(nd)和阿貝數(Vd)。 In the following table (5), the optical surface number (Surface #) sequentially numbered by the object end, the radius of curvature (R) of the optical surface of each lens on the optical axis, and the optical axis from the object end to the image end optical axis are listed. The distance between the optical surfaces (D) after the faces are adjacent to each other, the refractive index (nd) of the lens material, and the Abbe number (Vd).
表(五)
非球面係數表列如下:
該第三實施方式中之取像鏡頭100中,其球差、場曲及畸變分別如圖8到圖10所示。圖8中,分別針對f線(波長值435.8nm),d線(波長值587.6nm),c線(波長值656.3nm)而觀察到之球差值。總體而言,第三實施方式之取像鏡頭100對可見光(波長範圍在400nm-700nm之間)產生之球差值在(-0.05mm,0.05mm)範圍內。圖9中之S(子午場曲值)和T(弧矢場曲值)均控制在(-0.05mm,0.05mm)範圍內。圖10中之畸變率控制在 (-1%,1%)範圍內。由此可見,取像鏡頭100之像差、場曲、畸變都能被很好校正。 In the image taking lens 100 of the third embodiment, spherical aberration, curvature of field, and distortion are shown in FIGS. 8 to 10, respectively. In Fig. 8, the spherical aberration values were observed for the f-line (wavelength value of 435.8 nm), the d-line (wavelength value of 587.6 nm), and the c-line (wavelength value of 656.3 nm). In general, the taking lens 100 of the third embodiment produces a spherical aberration value in the visible light (wavelength ranging from 400 nm to 700 nm) in the range of (-0.05 mm, 0.05 mm). In Fig. 9, S (meridian curvature value) and T (radial field curvature value) are both controlled within the range of (-0.05 mm, 0.05 mm). The distortion rate in Figure 10 is controlled at (-1%, 1%) range. It can be seen that the aberration, field curvature and distortion of the image taking lens 100 can be well corrected.
本發明之取像鏡頭之第一,第二及第三透鏡之各光學表面均為非球面,因此不需要設置足夠長之空間來設置更多之鏡片以矯正像差,從而減小了鏡頭之鏡片數目,縮減取像鏡頭長度。而且利用上述六個關係式之限定,有效保證了取像鏡頭之成像品質。 In the first lens of the present invention, the optical surfaces of the second and third lenses are aspherical, so there is no need to provide a sufficiently long space to set more lenses to correct aberrations, thereby reducing the lens. The number of lenses is reduced to take the length of the lens. Moreover, by using the above six relational definitions, the imaging quality of the image taking lens is effectively ensured.
綜上所述,本發明符合發明專利要件,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,本發明之範圍並不以上述實施方式為限,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內。 In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention are It should be covered by the following patent application.
100‧‧‧取像鏡頭 100‧‧‧Image lens
10‧‧‧第一透鏡 10‧‧‧ first lens
20‧‧‧第二透鏡 20‧‧‧second lens
30‧‧‧第三透鏡 30‧‧‧ third lens
40‧‧‧影像感測器 40‧‧‧Image Sensor
41‧‧‧感測面 41‧‧‧Sense surface
11‧‧‧第一物端表面 11‧‧‧First object surface
12‧‧‧第一像端表面 12‧‧‧First image end surface
21‧‧‧第二物端表面 21‧‧‧Second object surface
22‧‧‧第二像端表面 22‧‧‧Second image end surface
31‧‧‧第三物端表面 31‧‧‧ Third end surface
32‧‧‧第三像端表面 32‧‧‧ Third image end surface
圖1係本發明取像鏡頭之光學結構示意圖;圖2係本發明取像鏡頭之第一實施方式之球差特性曲線圖;圖3係本發明取像鏡頭之第一實施方式之場曲特性曲線圖;圖4係本發明取像鏡頭之第一實施方式之畸變特性曲線圖;圖5係本發明取像鏡頭之第二實施方式之球差特性曲線圖;圖6係本發明取像鏡頭之第二實施方式之場曲特性曲線圖 ;圖7係本發明取像鏡頭之第二實施方式之畸變特性曲線圖;圖8係本發明取像鏡頭之第三實施方式之球差特性曲線圖;圖9係本發明取像鏡頭之第三實施方式之場曲特性曲線圖;圖10係本發明取像鏡頭之第三實施方式之畸變特性曲線圖。 1 is a schematic view showing the optical structure of the image taking lens of the present invention; FIG. 2 is a graph showing the spherical aberration characteristic of the first embodiment of the image taking lens of the present invention; and FIG. 3 is a field curvature characteristic of the first embodiment of the image taking lens of the present invention. FIG. 4 is a distortion characteristic diagram of the first embodiment of the image taking lens of the present invention; FIG. 5 is a spherical aberration characteristic diagram of the second embodiment of the image taking lens of the present invention; FIG. 6 is a drawing lens of the present invention; Field curvature characteristic curve of the second embodiment 7 is a distortion characteristic diagram of a second embodiment of the image taking lens of the present invention; FIG. 8 is a spherical aberration characteristic diagram of the third embodiment of the image taking lens of the present invention; and FIG. 9 is the image capturing lens of the present invention. 3 is a field curvature characteristic diagram of the embodiment; FIG. 10 is a distortion characteristic diagram of the third embodiment of the image taking lens of the present invention.
100‧‧‧取像鏡頭 100‧‧‧Image lens
10‧‧‧第一透鏡 10‧‧‧ first lens
20‧‧‧第二透鏡 20‧‧‧second lens
30‧‧‧第三透鏡 30‧‧‧ third lens
40‧‧‧影像感測器 40‧‧‧Image Sensor
41‧‧‧感測面 41‧‧‧Sense surface
11‧‧‧第一物端表面 11‧‧‧First object surface
12‧‧‧第一像端表面 12‧‧‧First image end surface
21‧‧‧第二物端表面 21‧‧‧Second object surface
22‧‧‧第二像端表面 22‧‧‧Second image end surface
31‧‧‧第三物端表面 31‧‧‧ Third end surface
32‧‧‧第三像端表面 32‧‧‧ Third image end surface
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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TW97130330A TWI407181B (en) | 2008-08-08 | 2008-08-08 | Imaging lens |
Applications Claiming Priority (1)
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TW97130330A TWI407181B (en) | 2008-08-08 | 2008-08-08 | Imaging lens |
Publications (2)
Publication Number | Publication Date |
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TW201007248A TW201007248A (en) | 2010-02-16 |
TWI407181B true TWI407181B (en) | 2013-09-01 |
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TW97130330A TWI407181B (en) | 2008-08-08 | 2008-08-08 | Imaging lens |
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TW (1) | TWI407181B (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6795253B2 (en) * | 2002-05-08 | 2004-09-21 | Fuji Photo Optical Co., Ltd. | Imaging lens |
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Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US6795253B2 (en) * | 2002-05-08 | 2004-09-21 | Fuji Photo Optical Co., Ltd. | Imaging lens |
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TW201007248A (en) | 2010-02-16 |
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MM4A | Annulment or lapse of patent due to non-payment of fees |