TWI408410B

TWI408410B - Optical zoom lens system

Info

Publication number: TWI408410B
Application number: TW098100702A
Authority: TW
Inventors: Yang-Cheng Luo
Original assignee: Hon Hai Prec Ind Co Ltd
Priority date: 2009-01-09
Filing date: 2009-01-09
Publication date: 2013-09-11
Also published as: TW201027118A

Abstract

The present invention relates to an optical zoom lens system. The optical zoom lens system includes, in the order from the object side to the image side along the optical axis thereof, a first lens group of negative refraction power, a second lens group of positive refraction power and a third lens group of positive refraction power. The second lens group includes, in the order from the object side to the image side along the optical axis thereof, three lenses. The optical zoom lens system satisfies the following conditions: (1) ND3 > 1.8, (2) (ND3-ND4) < 0.1, (3) TTL/fw < =1.3, (4) R6/fw > 0.7, wherein TTL designates a total length of the optical zoom lens system, ND3 designates a refraction ratio of the lens of the second lens group most near to the object side, ND4 designates a refraction ratio of the lens of the second lens group more near to the object side, fw designates a shortest focal length of the optical zoom lens system and R6 designates curvature radius of an objective surface of the lens of the second lens groups most near to the object side. In this way, the optical zoom lens system can achieve a compact design and an excellent optical ability while decreasing the manufacturing cost.

Description

光學變焦鏡頭Optical zoom lens

本發明涉及一種光學變焦鏡頭。The present invention relates to an optical zoom lens.

近年來，隨著多媒體技術之發展，對成像裝置如：數碼相機及攝像機等使用之CCD(Charged Coupled Device)或CMOS(Complementary Metal Oxide Semiconductor)等固體成像器件之攝像元件之需求越來越大。另外，由於這些固體成像器件如CCD或者CMOS之工藝技術提高，已經製作出每個像素只有幾個微米大小之成像器件，使得更加小型化之同時提高了對攝像鏡頭之解析度之要求。In recent years, with the development of multimedia technology, there has been an increasing demand for imaging elements of solid-state imaging devices such as CCD (Charged Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) used for imaging devices such as digital cameras and video cameras. In addition, due to the improved process technology of these solid-state imaging devices such as CCD or CMOS, imaging devices having a size of several micrometers per pixel have been fabricated, which makes the miniaturization more demanding for the resolution of the imaging lens.

採用上述攝像元件之成像裝置中，實現變焦功能之方式有兩種：光學變焦與電子變焦。電子變焦方式中，像之放大率越大則解析度越大，難以滿足高解析度之要求。光學變焦比電子變焦能獲得更大之解析度而成為優選採用之變焦方式。而隨著小型化及高像素化之發展，對成像裝置及搭載其上之鏡頭要求高對比度之同時也要求更進一步之小型化。惟，先前之光學變焦鏡頭在保證光學性能優良且成像品質好之同時很難實現成本較低且小型化。In the imaging device using the above imaging element, there are two ways to realize the zoom function: optical zoom and electronic zoom. In the electronic zoom method, as the magnification of the image is larger, the resolution is larger, and it is difficult to satisfy the requirement of high resolution. Optical zoom is a preferred zoom mode because it achieves greater resolution than electronic zoom. With the development of miniaturization and high pixelation, it is required to further reduce the size of the imaging device and the lens mounted thereon. However, the prior optical zoom lens is difficult to achieve low cost and miniaturization while ensuring excellent optical performance and good image quality.

有鑒於此，有必要提供一種成像性能良好、成本低且小型化之光學變焦鏡頭。In view of this, it is necessary to provide an optical zoom lens which is excellent in imaging performance, low in cost, and small in size.

一種光學變焦鏡頭，其從物側到像側依次包括：一具有負光焦度之第一透鏡組，一具有正光焦度之第二透鏡組，以及一具有正光焦度之第三透鏡組。其中，所述第二透鏡組從物側到像側依次包括三個透鏡。所述光學變焦鏡頭滿足以下條件：ND3>1.8、(ND3-ND4)<0.1、TTL/fw<=1.3及R6/fw>0.70，其中，ND3為所述第二透鏡組之最靠近物側之一透鏡對應之折射率，ND4為所述第二透鏡組之次靠近物側之另一透鏡對應之折射率，TTL為所述第一透鏡組、所述第二透鏡組及所述第三透鏡組之厚度總和，fw為所屬光學變焦鏡頭之最短焦距，R6為所述第二透鏡組最靠近物側之所述透鏡之物側表面之球面半徑值。An optical zoom lens includes, in order from the object side to the image side, a first lens group having a negative power, a second lens group having a positive power, and a third lens group having a positive power. Wherein, the second lens group includes three lenses in order from the object side to the image side. The optical zoom lens satisfies the following conditions: ND3>1.8, (ND3-ND4)<0.1, TTL/fw<=1.3, and R6/fw>0.70, wherein ND3 is the closest object side of the second lens group a refractive index corresponding to a lens, ND4 is a refractive index corresponding to another lens of the second lens group next to the object side, and TTL is the first lens group, the second lens group, and the third lens The sum of the thicknesses of the groups, fw is the shortest focal length of the optical zoom lens to which it belongs, and R6 is the spherical radius value of the object side surface of the lens closest to the object side of the second lens group.

條件式ND3>1.8、(ND3-ND4)<0.1及R6/fw>0.70可以減小系統之公差並保證該公差在可生產之範圍內，條件式TTL/fw<=1.3可以使整個光學變焦鏡頭之厚度較小，滿足上述條件之光學變焦鏡頭，成本較低，在該光學變焦鏡頭長度縮小之情況下仍能保證最終獲取較好之圖像品質。Conditional ND3>1.8, (ND3-ND4)<0.1 and R6/fw>0.70 can reduce the tolerance of the system and ensure that the tolerance is within the production range. The conditional TTL/fw<=1.3 can make the entire optical zoom lens The optical zoom lens that meets the above conditions is small in thickness, and the cost is low, and the image quality can be finally obtained even when the length of the optical zoom lens is reduced.

下面將結合附圖對本發明實施方式作進一步之詳細說明。The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

請一併參閱圖1及圖2，其為本發明實施方式所提供之光學變焦鏡頭100。所述光學變焦鏡頭100從物側到像側依次包括：一具有負光焦度之第一透鏡組10、一具有正光焦度之第二透鏡組20以及一具有正光焦度之第三透鏡組30。Please refer to FIG. 1 and FIG. 2 together, which is an optical zoom lens 100 according to an embodiment of the present invention. The optical zoom lens 100 includes, in order from the object side to the image side, a first lens group 10 having a negative power, a second lens group 20 having a positive power, and a third lens group having a positive power. 30.

所述光學變焦鏡頭100還包括一光闌(Aperture stop)40以及一濾光片50。所述光闌40位於所述第一透鏡組10與所述第二透鏡組20之間，以限制經過所述第一透鏡組10之光線進入所述第二透鏡組20之光通量，並讓經過所述第一透鏡組10後之光錐能更加對稱，使所述光學變焦鏡頭100之彗差得以修正。為節約成本，縮短所述光學變焦鏡頭100之全長，可採用不透光材料塗布所述第二透鏡組20中最靠近物側之鏡片之物側表面外圈，充當所述光闌40。可以理解，所述光闌40如此設置還有利於縮短所述光學變焦鏡頭100之全長。所述濾光片50位於所述第三透鏡組30與一成像面60之間，主要用於濾除進入所述光學變焦鏡頭100光線中之位於紅外波段之光線。The optical zoom lens 100 further includes an aperture stop 40 and a filter 50. The aperture 40 is located between the first lens group 10 and the second lens group 20 to limit the light flux entering the second lens group 20 through the first lens group 10, and let The light cone behind the first lens group 10 can be more symmetrical, so that the coma aberration of the optical zoom lens 100 can be corrected. In order to reduce the total length of the optical zoom lens 100, the object side surface outer ring of the lens closest to the object side of the second lens group 20 may be coated with an opaque material to serve as the aperture 40. It can be understood that the arrangement of the aperture 40 is also advantageous for shortening the overall length of the optical zoom lens 100. The filter 50 is located between the third lens group 30 and an imaging surface 60, and is mainly used for filtering light in the infrared band entering the light of the optical zoom lens 100.

本實施方式中，所述第一透鏡組10從物側至像側依次包括：一具有負光焦度之第一透鏡12以及一具有正光焦度之第二透鏡14。In this embodiment, the first lens group 10 includes, in order from the object side to the image side, a first lens 12 having a negative refractive power and a second lens 14 having a positive refractive power.

所述第二透鏡組20從物側至像側依次包括：一具有正光焦度之第三透鏡22、一具有負光焦度之第四透鏡24以及一具有負光焦度之第五透鏡26。其中，所述第三透鏡22與所述第四透鏡24使用點膠手段粘合在一起，構成一膠合透鏡，以改善光線經過所述光學變焦鏡頭100產生之色像差。The second lens group 20 includes, in order from the object side to the image side, a third lens 22 having a positive power, a fourth lens 24 having a negative power, and a fifth lens 26 having a negative power. . The third lens 22 and the fourth lens 24 are bonded together by using a dispensing method to form a cemented lens to improve chromatic aberration generated by the light passing through the optical zoom lens 100.

所述第三透鏡組30包括一具有正光焦度之第六透鏡32。The third lens group 30 includes a sixth lens 32 having positive power.

當所述光學變焦鏡頭100用於成像時，來自被攝物之光線從物側方向入射所述光學變焦鏡頭100並依次經過所述第一透鏡組10、所述第二透鏡組20及所述第三透鏡組30，最終彙聚到像側，藉由將CCD或CMOS等影像感測裝置設於所述成像面60處，即可獲取該被攝物之像。所述光學變焦鏡頭100變焦時，藉由所述第一透鏡組10及所述第二透鏡組20在光軸上之移動進行。所述光學變焦鏡頭100聚焦時，藉由所述第三透鏡組30在光軸上之移動進行。When the optical zoom lens 100 is used for imaging, light from a subject is incident on the optical zoom lens 100 from the object side direction and sequentially passes through the first lens group 10, the second lens group 20, and the The third lens group 30 is finally concentrated on the image side, and an image sensing device such as a CCD or a CMOS is provided on the imaging surface 60 to acquire an image of the object. When the optical zoom lens 100 is zoomed, the movement of the first lens group 10 and the second lens group 20 on the optical axis is performed. When the optical zoom lens 100 is focused, the movement of the third lens group 30 on the optical axis is performed.

可以理解，考慮到成像品質，本發明實施方式之所述第一透鏡組10、所述第二透鏡組20、以及所述第三透鏡組30中之所述第一透鏡12、所述第三透鏡22、所述第四透鏡24、所述第六透鏡32均採用玻璃製成，以降低色散。為進一步降低成本所述第二透鏡14和所述第五透鏡26均採用塑膠材料製成。在保證所述光學變焦鏡頭100成像品質較好之同時，成本相對較低，並且易於實現量產。It can be understood that, in consideration of image quality, the first lens group 10, the second lens group 20, and the first lens 12, the third lens in the third lens group 30 of the embodiment of the present invention The lens 22, the fourth lens 24, and the sixth lens 32 are each made of glass to reduce dispersion. To further reduce the cost, the second lens 14 and the fifth lens 26 are both made of a plastic material. While ensuring that the optical zoom lens 100 has better image quality, the cost is relatively low, and mass production is easy.

為實現小型化及高成像性能之要求，所述光學變焦鏡頭100滿足以下條件式：In order to achieve miniaturization and high imaging performance, the optical zoom lens 100 satisfies the following conditional formula:

(1)ND3>1.8；(1) ND3>1.8;

(2)(ND3-ND4)<0.1；(2) (ND3-ND4) <0.1;

(3)TTL/fw<=1.3；及(3) TTL/fw<=1.3; and

(4)R6/fw>0.70，(4) R6/fw>0.70,

其中，ND3為所述第三透鏡22之對應之折射率，ND4為所述第四透鏡24對應之折射率，TTL為所述第一透鏡組10、所述第二透鏡組20及所述第三透鏡組30之厚度總和，fw為所述光學變焦鏡頭100之最短焦距，R6為所述第三透鏡22物側表面之球面半徑值。Wherein ND3 is a corresponding refractive index of the third lens 22, ND4 is a refractive index corresponding to the fourth lens 24, and TTL is the first lens group 10, the second lens group 20, and the first The sum of the thicknesses of the three lens groups 30, fw is the shortest focal length of the optical zoom lens 100, and R6 is the spherical radius value of the object side surface of the third lens 22.

條件式(1)ND3>1.8，可以使所述第三透鏡22之折射率較高，可以減小所述第三透鏡22之曲率，從而減小光學變焦鏡頭100之公差。Conditional Formula (1) ND3>1.8, the refractive index of the third lens 22 can be made higher, and the curvature of the third lens 22 can be reduced, thereby reducing the tolerance of the optical zoom lens 100.

條件式(2)(ND3-ND4)<0.1，由於滿足條件式(1)，即所述第三透鏡22之折射率較高，而所述第三透鏡22之折射率與所述第四透鏡24之折射率之間之差異較小，所以第四透鏡24之折射率也較高，故也可以減小所述第四透鏡24之曲率，進一步減小光學變焦鏡頭100之公差。The conditional expression (2) (ND3-ND4) < 0.1, since the conditional expression (1) is satisfied, that is, the refractive index of the third lens 22 is higher, and the refractive index of the third lens 22 is the same as the fourth lens The difference between the refractive indices of 24 is small, so the refractive index of the fourth lens 24 is also high, so that the curvature of the fourth lens 24 can also be reduced, further reducing the tolerance of the optical zoom lens 100.

條件式(3)TTL/fw<=1.3，可以保證所述第一透鏡組10、所述第二透鏡組20及所述第三透鏡組30之厚度總和較小，從而使所述光學變焦鏡頭100小型化。The conditional expression (3) TTL/fw<=1.3 can ensure that the sum of the thicknesses of the first lens group 10, the second lens group 20, and the third lens group 30 is small, thereby making the optical zoom lens 100 miniaturization.

條件式(4)R6/fw>0.70，可以保證系統公差在可生產範圍內。Conditional formula (4) R6/fw>0.70 can ensure that the system tolerance is within the production range.

優選地，所述光學變焦鏡頭100還滿足以下條件：Preferably, the optical zoom lens 100 further satisfies the following conditions:

(5)10.5<(V3-V4)<11，滿足該條件式可以有效校正光學變焦鏡頭之色差。(5) 10.5 < (V3 - V4) < 11, which satisfies the conditional expression to effectively correct the chromatic aberration of the optical zoom lens.

下面請參照圖3至圖10，以具體實施方式來詳細說明光學變焦鏡頭100。3 to 10, the optical zoom lens 100 will be described in detail with reference to specific embodiments.

本實施方式中，所述第一透鏡組10、所述第二透鏡組20、所述第三透鏡組30中所述第一透鏡12、所述第三透鏡22、所述第四透鏡24以及所述第六透鏡32之各表面均為球面，所述第二透鏡14以及所述第五透鏡26之各表面均為非球面。In the embodiment, the first lens 12, the third lens 22, the fourth lens 24, and the first lens group 10, the second lens group 20, and the third lens group 30 Each surface of the sixth lens 32 is a spherical surface, and each surface of the second lens 14 and the fifth lens 26 is aspherical.

以透鏡表面中心為原點，光軸為x軸，透鏡表面之非球面面型運算式為：Taking the center of the lens surface as the origin and the optical axis as the x-axis, the aspherical surface of the lens surface is:

其中，為從光軸到透鏡表面之高度，k係二次曲面係數，A _i 為第i階之非球面面型係數。among them, For the height from the optical axis to the lens surface, the k-type quadric surface coefficient, A _i is the a-plane surface coefficient of the i-th order.

f：所述光學變焦鏡頭100之有效焦距；FNO：F(光圈)數；2ω：視場角。D4為所述第二透鏡14靠近像側之表面與所述光闌40之表面之軸上距離(兩個表面截得光軸之長度)，D10為所述第五透鏡26靠近像側之表面與所述第六透鏡32之靠近物側之表面之軸上距離。f: effective focal length of the optical zoom lens 100; FNO: F (aperture) number; 2ω: field of view angle. D4 is the axial distance between the surface of the second lens 14 near the image side and the surface of the aperture 40 (the length of the optical axis of the two surfaces), and D10 is the surface of the fifth lens 26 near the image side. An on-axis distance from the surface of the sixth lens 32 on the object side.

所述光學變焦鏡頭100各光學元件滿足表1~表3之條件，且其f=6.36~18.02mm；FNO=3.09~5.8；2ω=23.46°~63.24°。The optical components of the optical zoom lens 100 satisfy the conditions of Tables 1 to 3, and f=6.36~18.02 mm; FNO=3.09~5.8; 2ω=23.46°~63.24°.

在所述光學變焦鏡頭100中，其在廣角端、望遠端之像差特性曲線分別如圖3到圖10所示。所述光學變焦鏡頭100在廣角端時，圖3中之S(子午場曲值)和T(弧矢場曲值)均控制在(-0.1mm,0.1mm)範圍內。圖4中之畸變率控制在(-5%，5%)範圍內。圖5中之長波(656.3nm)及短波(435.8nm)之色差控制在(-0.003mm，0.004mm)範圍內。圖6中之球差控制在(-0.5mm,0.5mm)範圍內。光學變焦鏡頭100在望遠端時，圖7中之S(子午場曲值)和T(弧矢場曲值)均控制在(-0.1mm,0.1mm)範圍內。圖8中之畸變率控制在(-5%,5%)範圍內。圖9中之長波及短波之色差控制在(0mm,0.0035mm)範圍內。圖10中之球差控制在(-0.5mm,0.5mm)範圍內。由此可見，所述光學變焦鏡頭100在廣角端、望遠端之場曲、畸變、長波及短波之色差、球差均能被很好之校正。In the optical zoom lens 100, the aberration characteristic curves at the wide-angle end and the telephoto end are as shown in FIGS. 3 to 10, respectively. When the optical zoom lens 100 is at the wide-angle end, both S (meridian curvature value) and T (satellite curvature value) in FIG. 3 are controlled within the range of (-0.1 mm, 0.1 mm). The distortion rate in Figure 4 is controlled in the range of (-5%, 5%). The color difference of the long wave (656.3 nm) and the short wave (435.8 nm) in Fig. 5 is controlled within the range of (-0.003 mm, 0.004 mm). The spherical aberration in Fig. 6 is controlled within the range of (-0.5 mm, 0.5 mm). When the optical zoom lens 100 is at the telephoto end, the S (meridian curvature value) and the T (satellite curvature value) in FIG. 7 are both controlled within the range of (-0.1 mm, 0.1 mm). The distortion rate in Fig. 8 is controlled in the range of (-5%, 5%). The chromatic aberration of the long wave and the short wave in Fig. 9 is controlled within the range of (0 mm, 0.0035 mm). The spherical aberration in Fig. 10 is controlled within the range of (-0.5 mm, 0.5 mm). It can be seen that the optical zoom lens 100 can be well corrected at the wide-angle end, at the telephoto end, the curvature of field, the distortion, the chromatic aberration of the long wave and the short wave, and the spherical aberration.

所述光學變焦鏡頭具有較小之長度，成本較低、從而滿足光學變焦鏡頭小型化、低成本之要求，且所述光學變焦鏡頭在其長度縮小之情況下仍能保證所述光學變焦鏡頭總長與像差之間之平衡，提高最終獲取圖像之品質，並且將公差控制在可生產之範圍內。The optical zoom lens has a small length and a low cost, so as to meet the requirements of miniaturization and low cost of the optical zoom lens, and the optical zoom lens can ensure the total length of the optical zoom lens when its length is reduced. Balance with aberrations to improve the quality of the final image acquired and to control tolerances within production.

另外，本領域技術人員還可在本發明精神內做其他變化，當然，這些依據本發明精神所做的變化，都應包含在本發明所要求保護的範圍之內。In addition, those skilled in the art can make other changes in the spirit of the present invention. Of course, the changes made in accordance with the spirit of the present invention should be included in the scope of the present invention.

100．．．光學變焦鏡頭100. . . Optical zoom lens

10．．．第一透鏡組10. . . First lens group

12．．．第一透鏡12. . . First lens

14．．．第二透鏡14. . . Second lens

20．．．第二透鏡組20. . . Second lens group

22．．．第三透鏡twenty two. . . Third lens

24．．．第四透鏡twenty four. . . Fourth lens

26．．．第五透鏡26. . . Fifth lens

30．．．第三透鏡組30. . . Third lens group

32．．．第六透鏡32. . . Sixth lens

40．．．光闌40. . . Light

50．．．濾光片50. . . Filter

60．．．成像面60. . . Imaging surface

圖1為本發明提供之光學變焦鏡頭在廣角端之結構示意圖。FIG. 1 is a schematic structural view of an optical zoom lens provided at a wide angle end according to the present invention.

圖2為本發明提供之光學變焦鏡頭在望遠端之結構示意圖。2 is a schematic structural view of an optical zoom lens provided at a telephoto end according to the present invention.

圖3為圖1之光學變焦鏡頭在廣角端之場曲特性曲線圖。3 is a graph showing the field curvature characteristics of the optical zoom lens of FIG. 1 at the wide angle end.

圖4為圖1之光學變焦鏡頭在廣角端之畸變特性曲線圖。4 is a graph showing distortion characteristics of the optical zoom lens of FIG. 1 at a wide angle end.

圖5為圖1之光學變焦鏡頭在廣角端之長波及短波色差特性曲線圖。FIG. 5 is a graph showing long-wavelength and short-wave chromatic aberration characteristics at the wide-angle end of the optical zoom lens of FIG. 1. FIG.

圖6為圖1之光學變焦鏡頭在廣角端之球差特性曲線圖。6 is a graph showing spherical aberration characteristics of the optical zoom lens of FIG. 1 at a wide angle end.

圖7為圖2之光學變焦鏡頭在望遠端之場曲特性曲線圖。7 is a graph showing the field curvature characteristics of the optical zoom lens of FIG. 2 at the telephoto end.

圖8為圖2之光學變焦鏡頭在望遠端之畸變特性曲線圖。FIG. 8 is a graph showing distortion characteristics of the optical zoom lens of FIG. 2 at the telephoto end.

圖9為圖2之光學變焦鏡頭在望遠端之長波及短波色差特性曲線圖。FIG. 9 is a graph showing long-wavelength and short-wave chromatic aberration characteristics of the optical zoom lens of FIG. 2 at the telephoto end.

圖10為圖2之光學變焦鏡頭在望遠端之球差特性曲線圖。FIG. 10 is a graph showing spherical aberration characteristics of the optical zoom lens of FIG. 2 at the telephoto end.

100．．．光學變焦鏡頭100. . . Optical zoom lens

10．．．第一透鏡組10. . . First lens group

12．．．第一透鏡12. . . First lens

14．．．第二透鏡14. . . Second lens

20．．．第二透鏡組20. . . Second lens group

22．．．第三透鏡twenty two. . . Third lens

24．．．第四透鏡twenty four. . . Fourth lens

26．．．第五透鏡26. . . Fifth lens

30．．．第三透鏡組30. . . Third lens group

32．．．第六透鏡32. . . Sixth lens

40．．．光闌40. . . Light

50．．．濾光片50. . . Filter

60．．．成像面60. . . Imaging surface

Claims

一種光學變焦鏡頭，其從物側到像側依次包括：一具有負光焦度之第一透鏡組、一具有正光焦度之第二透鏡組以及一具有正光焦度之第三透鏡組，其中，所述第二透鏡組從物側到像側依次包括三個透鏡，所述光學變焦鏡頭滿足以下條件：ND3>1.8、(ND3-ND4)<0.1、TTL/fw<=1.3及R6/fw>0.70，其中，ND3為所述第二透鏡組之最靠近物側之一透鏡對應之折射率，ND4為所述第二透鏡組之次靠近物側之另一透鏡對應之折射率，TTL為所述第一透鏡組、所述第二透鏡組及所述第三透鏡組之厚度總和，fw為所述光學變焦鏡頭之最短焦距，R6為所述第二透鏡組最靠近物側之所述透鏡之物側表面之球面半徑值。An optical zoom lens comprising, in order from the object side to the image side, a first lens group having a negative power, a second lens group having a positive power, and a third lens group having a positive power, wherein The second lens group includes three lenses in order from the object side to the image side, and the optical zoom lens satisfies the following conditions: ND3>1.8, (ND3-ND4)<0.1, TTL/fw<=1.3, and R6/fw >0.70, wherein ND3 is a refractive index corresponding to one lens of the second lens group closest to the object side, and ND4 is a refractive index corresponding to another lens of the second lens group next to the object side, TTL is a sum of thicknesses of the first lens group, the second lens group, and the third lens group, fw is a shortest focal length of the optical zoom lens, and R6 is the closest to the object side of the second lens group The spherical radius value of the object side surface of the lens.

如申請專利範圍第1項所述之光學變焦鏡頭，其中，所述光學變焦鏡頭還滿足以下條件：10.5<(V3-V4)<11，其中，V3為所述第二透鏡組中最靠近物側之一透鏡對應之色散係數，V4為所述第二透鏡組中次靠近物側之另一透鏡對應之色散係數。The optical zoom lens of claim 1, wherein the optical zoom lens further satisfies the following condition: 10.5 < (V3-V4) < 11, wherein V3 is the closest object in the second lens group One of the side lenses corresponds to a dispersion coefficient, and V4 is a dispersion coefficient corresponding to the other lens of the second lens group that is next to the object side.

如申請專利範圍第1項所述之光學變焦鏡頭，其中，所述光學變焦鏡頭還包括一光闌，該光闌位於所述第一透鏡組與所述第二透鏡組之間。The optical zoom lens of claim 1, wherein the optical zoom lens further comprises an aperture between the first lens group and the second lens group.

如申請專利範圍第1項所述之光學變焦鏡頭，其中，所述第一透鏡組包括兩個透鏡，靠物側之一透鏡之各表面均為球面，靠像側之一透鏡之各表面均為非球面。The optical zoom lens of claim 1, wherein the first lens group comprises two lenses, and each surface of the lens on the object side is spherical, and each surface of the lens on the image side is It is aspherical.

如申請專利範圍第1項所述之光學變焦鏡頭，其中，所述第一透鏡組包括兩個透鏡，靠物側之一透鏡由玻璃製成，靠像側之一透鏡由塑膠製成。The optical zoom lens of claim 1, wherein the first lens group comprises two lenses, one lens on the object side is made of glass, and one lens on the image side is made of plastic.

如申請專利範圍第1項所述之光學變焦鏡頭，其中，所述第二透鏡組中最靠物側之所述透鏡和次靠物側之所述透鏡之各表面均為球面，靠像側之一透鏡之各表面均為非球面。The optical zoom lens according to claim 1, wherein each of the lens on the most object side of the second lens group and the lens on the second object side is spherical, and the image side is Each surface of one of the lenses is aspherical.

如申請專利範圍第1項所述之光學變焦鏡頭，其中，所述第二透鏡組中最靠物側之所述透鏡和次靠物側之所述透鏡均由玻璃製成，所述第二透鏡組中靠像側之一透鏡由塑膠製成。The optical zoom lens according to claim 1, wherein the lens on the most object side of the second lens group and the lens on the sub-object side are both made of glass, the second One lens on the image side of the lens group is made of plastic.

如申請專利範圍第1項所述之光學變焦鏡頭，其中，所述第三透鏡組包括一具有正光焦度之透鏡，所述透鏡之各表面均為球面。The optical zoom lens of claim 1, wherein the third lens group comprises a lens having a positive power, and each surface of the lens is a spherical surface.

如申請專利範圍第1項所述之光學變焦鏡頭，其中，所述第三透鏡組包括一具有正光焦度之透鏡，所述透鏡由玻璃製成。The optical zoom lens of claim 1, wherein the third lens group comprises a lens having positive power, the lens being made of glass.

如申請專利範圍第1項所述之光學變焦鏡頭，其中，所述光學變焦鏡頭還包括設置於所述第三透鏡組像側之紅外濾光片。The optical zoom lens of claim 1, wherein the optical zoom lens further comprises an infrared filter disposed on an image side of the third lens group.