CN116047736A - 变焦镜头和具有变焦镜头的图像捕获装置 - Google Patents
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Abstract
本发明公开了变焦镜头和具有变焦镜头的图像捕获装置。变焦镜头包括具有负折光力的第一透镜单元、具有正折光力的第二透镜单元、以及两个或更多个附加的透镜单元。在变焦时,所述第一透镜单元移动,并且相邻的透镜单元之间的间隔改变。所述第一透镜单元中包括的负透镜中部署在最靠近物侧的负透镜A的折光率高于或等于1.89,并且所述负透镜A和与所述负透镜A的像侧相邻地部署的透镜B满足预定的关系。
Description
技术领域
本发明涉及变焦镜头等并且适合于诸如数字摄像机、数字静态相机、广播相机、以及卤化银胶片相机的图像捕获装置。
背景技术
广角镜头广泛用于风景摄影、天文摄影等。期望广角镜头具有广视角与高光学性能。
日本专利特开No.2015-203734描述了变焦镜头,该变焦镜头通过将多个负透镜用到第一透镜单元中以平缓地偏转离轴光线来提供广视角与高性能。
在日本专利特开No.2015-203734中描述的变焦镜头中,第一透镜的透镜开角大,并且在第二透镜的物侧透镜表面上相对于透镜表面斜反射的不必要的光在第一透镜的像侧透镜表面上反射并且到达像平面。如果这样的不必要的光到达像平面,那么在照片上可能非期望地出现重影(ghost)效应。
发明内容
本发明的一个方面提供了一种变焦镜头。该变焦镜头包括具有负折光力的第一透镜单元、具有正折光力的第二透镜单元、以及两个或更多个附加的透镜单元。所述第一透镜单元、所述第二透镜单元、以及所述两个或更多个附加的透镜单元从物侧向像侧依次部署,并且在变焦时,所述第一透镜单元被布置为移动,并且相邻的透镜单元之间的间隔改变。所述第一透镜单元中包括的负透镜中部署在最靠近物侧的负透镜A的折光率高于或等于1.89。在所述负透镜A的像侧透镜表面的曲率半径为Ra、与所述负透镜A的像侧相邻地部署的透镜B的物侧透镜表面的曲率半径为Rb、所述负透镜A和所述透镜B之间的空气间隙为Da、并且所述透镜B和与所述透镜B的像侧相邻地部署的透镜之间的空气间隙为Db的情况下,以下不等式被满足:
2.0<Ra/Da<100,以及
10<Rb/Db<100。
本发明的另外的特征从以下参考附图对示例性实施例的描述将变得清楚。
附图说明
图1是根据第一实施例的变焦镜头的镜头截面图。
图2A和2B是根据第一实施例的变焦镜头的像差图。
图3是根据第二实施例的变焦镜头的镜头截面图。
图4A和4B是根据第二实施例的变焦镜头的像差图。
图5是根据第三实施例的变焦镜头的镜头截面图。
图6A和6B是根据第三实施例的变焦镜头的像差图。
图7是根据第四实施例的变焦镜头的镜头截面图。
图8A和8B是根据第四实施例的变焦镜头的像差图。
图9是根据第五实施例的变焦镜头的镜头截面图。
图10A和10B是根据第五实施例的变焦镜头的像差图。
图11是根据第六实施例的变焦镜头的镜头截面图。
图12A和12B是根据第六实施例的变焦镜头的像差图。
图13是示出图像捕获装置的示意图。
图14是示出不必要的光的光路的示意图。
具体实施方式
在下文中,将参考附图描述根据本发明的变焦镜头和图像捕获装置的实施例。
图1、3、5、7、9和11分别是根据第一至第六实施例的变焦镜头L0的截面图。每个实施例的变焦镜头L0是在诸如数字摄像机、数字静态相机、广播相机、卤化银胶片相机、监控相机、以及板载相机的图像捕获装置中使用的变焦镜头。
在每个镜头截面图中,左侧是物侧,并且右侧是像侧。每个实施例的变焦镜头L0可以用作投影仪镜头。此时,左侧是屏幕侧,并且右侧是投影图像侧。
每个实施例的变焦镜头L0包括从物侧向像侧依次部署的具有负折光力的第一透镜单元L1、具有正折光力的第二透镜单元L2、以及两个或更多个附加的透镜单元。在每个截面图中,Li表示从物侧起第i个(i为自然数)的第i透镜单元。在说明书中,透镜单元是在变焦时一体地移动或静止不动的一组透镜。换句话说,相邻的透镜单元之间的间隔在变焦时改变。每个透镜单元可以由单个透镜构成或者可以由多个透镜构成。每个透镜单元可以包括孔径光阑。
每个镜头截面图中所示的箭头表示从广角端到望远端的变焦时的移动轨迹和从无限远到短距离的聚焦时的移动轨迹。
在每个镜头截面图中,SP指示孔径光阑。IP指示像平面,并且当每个实施例的变焦镜头在数字静态相机或数字摄像机中使用时,部署诸如CCD传感器和CMOS传感器的固态图像拾取设备(光电转换设备)的图像拾取表面。当每个实施例的变焦镜头用作卤化银胶片相机的拍摄变焦镜头时,与胶片表面对应的感光表面被放置在像平面IP处。
图2、4、6、8、10和12分别是根据第一至第六实施例的变焦镜头的像差图。在每个像差图中,(A)是在广角端的像差图,并且(B)是在望远端的像差图。
在球面像差图中,Fno是F数,并且表示d线(波长:587.6nm)的球面像差和g线(波长:435.8nm)的球面像差。在像散图中,S表示弧矢像平面处的像差,并且M表示子午像平面处的像差。失真像差图表示d线的失真像差。色差图表示g线的横向色差。ω是图像拾取半视角(°)。
接下来,将描述每个实施例的变焦镜头的特性配置。
在每个实施例的变焦镜头中,通过将第一透镜单元L1的折光力设置为负值,入射光瞳位置向物侧移位以减小前透镜(部署在最靠近物侧的透镜)的直径。
通过将第二透镜单元L2的折光力设置为正值,由第一透镜单元L1发散的轴上边缘光线被会聚以便减小第二透镜单元L2的下游的部分的直径。另外,通过在正的第二透镜单元L2的像侧提供两个或更多个附加的透镜单元并且在变焦时移动第一透镜单元L1,像差在广变焦范围内被有利地校正。
在每个实施例的变焦镜头L0中,第一透镜单元L1中的负透镜中的最靠近物侧的负透镜A的折光率高于或等于1.89。此外,满足以下不等式。这里,Ra是负透镜A的像侧透镜表面的曲率半径。Rb是与负透镜A的像侧相邻地部署的透镜B的物侧透镜表面的曲率半径。Da是负透镜A和透镜B之间的空气间隙。Db是透镜B和与透镜B的像侧相邻地部署的透镜之间的空气间隙。
2.0<Ra/Da<100 (1)
10<Rb/Db<100 (2)
广角镜头趋于具有第一透镜单元中部署在最靠近物侧的第一透镜的增大的直径,并且趋于具有增大的透镜开角。此时,如图14中所示,在部署在第一透镜的像侧的第二透镜的物侧透镜表面上反射的光进一步在第一透镜的像侧透镜表面上反射,并且可以形成到达像平面的光路。此时,由于第一次反射和第二次反射都是相对于透镜表面的斜反射,反射强度相对高,因此反射光可以在像平面处产生明显的重影效应。
由于这个原因,在每个实施例的变焦镜头L0中,负透镜A的折光率被设置为1.89以对负透镜A赋予必要的折光力,同时增大透镜开角。通过在满足不等式(1)和(2)的范围内增大负透镜A的像侧透镜表面的曲率和透镜B的物侧透镜表面的曲率,离轴光线以相对于透镜表面接近直角的角度反射,因此重影效应的强度降低。当曲率中的任一个超过不等式(1)和(2)中的对应一个的上限值时,难以对负透镜A或透镜B赋予必要的折光力。
利用以上配置,可以实现能够减少重影图像的发生同时具有高光学性能的变焦镜头。
不等式(1)和(2)中的任一个的数值范围的上限值和下限值中的至少一个优选地被设置为以下的不等式(1a)或不等式(2a)。
2.3<Ra/Da<50 (1a)
11<Rb/Db<50 (2a)
更优选地,不等式(1)和(2)中的任一个的数值范围的上限值和下限值中的至少一个优选地被设置为以下的不等式(1b)或不等式(2b)。
2.6<Ra/Da<10 (1b)
11.5<Rb/Db<30 (2b)
通过将负透镜A的折光率设置为高于1.89的值,从减少重影图像的观点可以更优选地设置负透镜A的透镜开角。
接下来,将描述根据每个实施例的变焦镜头L0的配置。
与负透镜A的像侧相邻地部署的透镜B可以是负透镜。利用这个配置,包括负透镜A的负透镜被连续地部署,因此离轴光线能够被平缓地偏转。因此,可以有利地减少特别是在广角端的像散和像场弯曲。
第一透镜单元L1可以由从物侧向像侧依次部署的三个负透镜和一个正透镜构成。通过连续地部署三个负透镜,可以减少在广角端的像散和像场弯曲。通过在最靠近像侧处部署正透镜,可以进一步减少特别是在广角端的横向色差。
接下来,将描述对于每个实施例的变焦镜头L0可以满足的不等式。
每个实施例的变焦镜头L0优选地满足以下不等式中的一个或多个。
1.80<NdB (3)
2.0<d/fw<15 (4)
1.5<d2/fw<5.0 (5)
0.15<GL/TL<0.30 (6)
-20<100×(y-y0)/y0<-8 (7)
-2.5<f1fw<-0.8 (8)
-3.5<fa/fw<-1.5 (9)
-3.5<fb/fw<-0.8 (10)
1.2<ft/fw<2.1 (11)
这里,NdB是透镜B对于d线的折光率。d是在广角端从负透镜A的像侧透镜表面到孔径光阑SP的距离。fw是在广角端变焦镜头L0的整个系统的焦距。d2是在广角端从透镜B的像侧透镜表面到孔径光阑SP的距离。GL是从第一透镜单元L1的最靠近物侧的透镜表面到第一透镜单元L1的最靠近像侧的透镜表面的距离。TL是在广角端从变焦镜头L0的最靠近物侧的透镜表面到像平面IP(近轴成像平面)的距离。y是在广角端真实像高的最大值。y0是在广角端与最大真实像高y相关联的视角(最大视角)下的理想像高。f1是第一透镜单元L1的焦距。fa是负透镜A的焦距。fb是透镜B的焦距。ft是在望远端变焦镜头L0的整个系统的焦距。
在下文中,将描述每个不等式的技术含义。
当值低于不等式(3)的下限值时,在对透镜B赋予期望的折光力时所需要的透镜开角减小,因此特别是透镜B的物侧透镜表面上的反射可能有问题。
不等式(4)意指在广角端从负透镜A的像侧透镜表面到孔径光阑SP的距离与在广角端整个系统的焦距之比。当值超过上限值时,在广角端从负透镜A的像侧透镜表面到孔径光阑SP的距离太长,因此负透镜A的大小趋于增大。当值低于下限值时,难以充分地减小由于在负透镜A和透镜B之间反射的不必要的光而导致的重影图像的强度。
不等式(5)意指在广角端从透镜B的像侧透镜表面到孔径光阑SP的距离与在广角端整个系统的焦距之比。当值超过上限值时,在广角端从透镜B的像侧透镜表面到孔径光阑SP的距离太长,因此透镜B的大小趋于增大。当值低于下限值时,难以充分地减小由于在负透镜A和透镜B之间反射的不必要的光而导致的重影图像的强度。
不等式(6)意指从第一透镜单元L1的最靠近物侧的透镜表面到第一透镜单元L1的最靠近像侧的透镜表面的距离与在广角端从整个系统的最靠近物侧的透镜表面到近轴成像平面的距离之比。当值超过上限值时,从第一透镜单元L1的最靠近物侧的透镜表面到第一透镜单元L1的最靠近像侧的透镜表面的距离太长,因此从孔径光阑SP到第一透镜(部署在最靠近物侧的透镜)的距离延长。作为结果,第一透镜的大小增大。当值低于下限值时,在广角端从整个系统的最靠近物侧的透镜表面到近轴成像平面的距离太长,因此变焦镜头L0的大小增大。
不等式(7)意指在广角端的失真率。理想像高y0是从f×tanθ获得的值,其中在广角端整个系统的焦距为f,并且在光轴和从与最大真实像高y相关联的物侧进入到整个系统的最靠近物侧的光线之间形成的角度(半视角)为θ。真实像高y可以由变焦镜头L0的像圈的最大半径确定。当值超过上限值时,需要降低第一透镜单元L1中的折光力以减小失真率的绝对值,因此从最靠近物侧的透镜表面到像平面IP的距离延长,其结果是变焦镜头L0的大小趋于增大。当值低于下限值时,失真率的绝对值太大,因此图像的周边部分被大量压缩,其结果是难以获得充分高质量的图像。
不等式(8)意指第一透镜单元L1的焦距与在广角端整个系统的焦距之比。当值超过上限值时,第一透镜单元L1的焦距的绝对值太短,因此折光力太高,其结果是在广角端的像散、像场弯曲和横向色差非期望地增大。当值低于下限值时,第一透镜单元L1的焦距的绝对值太长,因此从最靠近物侧的透镜表面到像平面IP的距离延长,并且大小增大。
不等式(9)意指负透镜A的焦距与在广角端整个系统的焦距之比。当值超过上限值时,负透镜A的焦距的绝对值太短,因此折光力太高,其结果是特别在广角端的横向色差增大。当值低于下限值时,负透镜A的焦距的绝对值太长,因此从最靠近物侧的透镜表面到像平面IP的距离延长,其结果是负透镜A的直径增大。
不等式(10)意指透镜B的焦距与在广角端整个系统的焦距之比。当值超过上限值时,透镜B的焦距的绝对值太短,因此折光力太高,其结果是特别在广角端的像散和横向色差增大。当值低于下限值时,透镜B的焦距的绝对值太长,因此从最靠近物侧的透镜表面到像平面IP的距离延长,其结果是透镜B的直径增大。
不等式(11)意指变焦比。当值超过上限值时,每个透镜单元的移动量趋于增大,因此变焦镜头L0的大小趋于增大以确保移动的空间。当值低于下限值时,变焦比太小,因此难以发挥作为变焦镜头的充分功能。
不等式(3)至(11)中的每一个的上限值和下限值中的至少一个更优选地被设置为以下数值范围。
1.82<NdB (3a)
2.3<d/fw<10 (4a)
2.0<d2/fw<4.0 (5a)
0.17<GL/TL<0.27 (6a)
-19<100×(y-y0)/y0<-11 (7a)
-2.0<f1/fw<-1.0 (8a)
-3.1<fa/fw<-1.7 (9a)
-3.0<fb/fw<-1.0 (10a)
1.3<ft/fw<2.0 (11a)
不等式(3)至(11)中的每一个的上限值和下限值中的至少一个进一步优选地被设置为以下数值范围。
1.84<NdB (3b)
2.7<d/fw<5 (4b)
2.3<d2/fw<3.5 (5b)
0.19<GL/TL<0.24 (6b)
-18<100×(y-y0)/y0<-14 (7b)
-1.8<flfw<-1.2 (8b)
-2.8<fa/fw<-1.9 (9b)
-2.7<fbfw<-1.2 (10b)
1.4<ft/fw<1.9 (11b)
接下来,将描述根据每个实施例的变焦镜头L0的详细配置。
第一实施例
第一实施例的变焦镜头L0包括从物侧向像侧依次部署的具有负折光力的第一透镜单元L1、具有正折光力的第二透镜单元L2、具有负折光力的第三透镜单元L3、具有正折光力的第四透镜单元L4和具有正折光力的第五透镜单元L5。通过交替地布置具有负折光力的透镜单元和具有正折光力的透镜单元,横向色差和纵向色差被适当地校正。通过设置具有正折光力的第五透镜单元L5,以广视角确保后焦距,可以减少由于像平面IP(或可以部署在物侧的低通过滤器或IR截止过滤器)和第五透镜单元L5之间反射的不必要的光而导致的重影图像。采用在聚焦时使第三透镜单元L3移动的配置,并且第三透镜单元L3具有同心形状使得第三透镜单元L3的物侧具有面向孔径光阑SP的凹表面。因此,即使当在聚焦中第三透镜单元L3移动时,像场弯曲和像散的波动也减小,因此在整个画面上获得高性能。当第三透镜单元L3由两个透镜(即,正透镜和负透镜)构成时,即使当透镜在光轴方向上移动时,横向色差和纵向色差的波动也减小。
第一透镜单元L1在变焦时的轨迹从广角端到望远端单调地向像侧移位。因此,第一透镜单元L1的焦距的绝对值被延长(折光力被减小)以提供变焦镜头L0的高性能。
第二实施例
第二实施例与第一实施例的不同在于作为聚焦单元的第三透镜单元L3由单个负透镜构成。因此,在聚焦时移动的第三透镜单元L3的大小被减小。
第三实施例
根据第三实施例的变焦镜头L0包括从物侧向像侧依次部署的具有负折光力的第一透镜单元L1、具有正折光力的第二透镜单元L2、具有负折光力的第三透镜单元L3、具有负折光力的第四透镜单元L4和具有正折光力的第五透镜单元L5。通过设置具有负折光力的第四透镜单元L4,在具有正折光力的第五透镜单元L5中出现的横向色差被有利地校正。通过在最靠近物侧部署正透镜,在第一透镜单元L1中出现的负失真像差被减小以减小失真率,其结果是画面周边区域的压缩比被减小以增大分辨力。
通过将第四透镜单元L4与第五透镜单元L5接合,在第四透镜单元L4和第五透镜单元L5之间反射的不必要的光的强度被减小以减少重影图像。
通过使第五透镜单元L5在望远端向物侧移动,第五透镜单元L5能够被部署在望远端的离轴光线高度低的位置,并且大小被减小。
第四实施例
根据第四实施例的变焦镜头L0包括具有负折光力的第一透镜单元L1、具有正折光力的第二透镜单元L2、具有正折光力的第三透镜单元L3、具有负折光力的第四透镜单元L4、具有正折光力的第五透镜单元L5和具有正折光力的第六透镜单元L6。孔径光阑SP前后的正折光力被划分为两个透镜单元,并且这两个透镜单元在变焦时独立移动。因此,球面像差和彗形像差在广变焦范围中被有利地校正。
第五实施例
根据第五实施例的变焦镜头L0包括从物侧向像侧布置的具有负折光力的第一透镜单元L1、具有正折光力的第二透镜单元L2、具有负折光力的第三透镜单元L3、具有正折光力的第四透镜单元L4和具有负折光力的第五透镜单元L5。通过设置具有正折光力的第四透镜单元L4和设置具有负折光力的第五透镜单元L5,第四透镜单元L4和第五透镜单元L5的组合中的前主点位置能够被移动到物侧,并且后焦距能够被缩短,因此变焦镜头L0的大小被减小。
第六实施例
第六实施例的变焦镜头L0包括从物侧向像侧依次部署的具有负折光力的第一透镜单元L1、具有正折光力的第二透镜单元L2、具有负折光力的第三透镜单元L3和具有正折光力的第四透镜单元L4。通过在第四透镜单元L4中提供正透镜和负透镜中的每一个,横向色差在广变焦范围内被有利地校正。
上述实施例中的每一个的变焦镜头L0可以在具有校正像差(失真像差和横向色差)的图像处理功能的图像捕获装置中使用。
在下文中,将描述与第一至第六实施例分别对应的第一至第六数值实施例。
在每个数值实施例的表面数据中,r表示每个光学表面的曲率半径,并且d(mm)表示第m个表面和第(m+1)个表面之间的轴上间隔(光轴上的距离)。这里,m是分配给表面并且从光入射侧起计数的编号。nd表示每个光学构件对于d线的折光率,并且νd表示光学构件的阿贝数。材料的阿贝数vd由vd=(Nd-1)(NF-NC)表达,其中夫琅禾费(Fraunhofer)线的d线(587.6nm)、F线(486.1nm)、C线(656.3nm)和g线(435.8nm)的折光率分别为Nd、NF、NC、Ng。
当光学表面是非球表面时,符号“*”被附到表面编号。非球面形状由x=(h2R)[1+{1-(1+k)(h/R)2}1/2]+A4×h4+A6×h6+A8×h8+A10×h10表达,其中X是在光轴方向上从表面顶点的位移量,h是在与光轴垂直的方向上离光轴的高度,R是近轴曲率半径,k是圆锥常数,并且A4、A6、A8、A10、A12、……是各阶的非球面系数。
在每个非球面系数中,“e±XX”意指“×10±XX”。
第一数值实施例
第二数值实施例
第三数值实施例
第四数值实施例
第五数值实施例
第六数值实施例
每个实施例中的各种值如下表所示。
表1
图像捕获装置
接下来,将参考图13描述使用根据本发明的实施例的变焦镜头的数字静态相机(图像捕获装置)的实施例。在图13中,参考符号10表示相机主体,并且参考符号11表示包括根据上述第一至第六实施例中的任一个的变焦镜头L0的镜头装置。
参考符号12表示并入在相机主体10中并且接收和光电转换由镜头装置11形成的光学图像的固态图像拾取设备(光电转换设备),诸如CCD传感器和CMOS传感器。相机主体10可以是具有快转反射镜的所谓单镜头反光式相机,或者可以是不具有快转反射镜的所谓无反射镜相机。
以这种方式,通过将根据本发明的实施例的变焦镜头L0应用到诸如数字静态相机的图像捕获装置,可以获得具有低像差和减少的重影效应的高质量图像。
以上已描述了本发明的实施例;然而,本发明不限于这些实施例。在本发明的范围内可以进行各种修改和改变。
虽然已参考示例性实施例描述了本发明,但是要理解的是,本发明不限于所公开的示例性实施例。随附权利要求的范围要被赋予最广泛的解释以便涵盖所有这样的修改以及等同的结构和功能。
Claims (22)
1.一种变焦镜头,包括:
具有负折光力的第一透镜单元;
具有正折光力的第二透镜单元;以及
两个或更多个附加的透镜单元,其中
所述第一透镜单元、所述第二透镜单元、以及所述两个或更多个附加的透镜单元从物侧向像侧依次部署,
在变焦时,所述第一透镜单元被布置为移动,并且相邻的透镜单元之间的间隔改变,
所述第一透镜单元中包括的负透镜中部署在最靠近物侧的负透镜A的折光率高于或等于1.89,并且
在所述负透镜A的像侧透镜表面的曲率半径为Ra、与所述负透镜A的像侧相邻地部署的透镜B的物侧透镜表面的曲率半径为Rb、所述负透镜A和所述透镜B之间的空气间隙为Da、并且所述透镜B和与所述透镜B的像侧相邻地部署的透镜之间的空气间隙为Db的情况下,以下不等式被满足:
2.0<Ra/Da<100,以及
10<Rb/Db<100。
2.根据权利要求1所述的变焦镜头,其中,在所述透镜B的折光率为NdB的情况下,以下不等式被满足:
1.80<NdB。
3.根据权利要求1所述的变焦镜头,还包括孔径光阑,其中
在广角端从所述负透镜A的像侧透镜表面到所述孔径光阑的距离为d、并且在广角端所述变焦镜头的焦距为fw的情况下,以下不等式被满足:
2.0<d/fw<15。
4.根据权利要求1所述的变焦镜头,还包括孔径光阑,其中
在广角端从所述透镜B的像侧透镜表面到所述孔径光阑的距离为d2、并且在广角端所述变焦镜头的焦距为fw的情况下,以下不等式被满足:
1.5<d2/fw<5.0。
5.根据权利要求1所述的变焦镜头,其中
在从所述第一透镜单元的最靠近物侧的透镜表面到所述第一透镜单元的最靠近像侧的透镜表面的距离为GL、并且
在广角端从所述变焦镜头的最靠近物侧的透镜表面到像平面的距离为TL的情况下,以下不等式被满足:
0.15<GL/TL<0.30。
6.根据权利要求1所述的变焦镜头,其中,在广角端的最大真实像高为y、并且在广角端所述变焦镜头的最大视角下的理想像高为y0的情况下,以下不等式被满足:
-20<100×(y-y0)/y0<-8。
7.根据权利要求1所述的变焦镜头,其中,在所述第一透镜单元的焦距为f1、并且在广角端所述变焦镜头的焦距为fw的情况下,以下不等式被满足:
-2.5<f1/fw<-0.8。
8.根据权利要求1所述的变焦镜头,其中,在所述负透镜A的焦距为fa、并且在广角端所述变焦镜头的焦距为fw的情况下,以下不等式被满足:
-3.5<fa/fw<-1.5。
9.根据权利要求1所述的变焦镜头,其中所述透镜B是负透镜。
10.根据权利要求9所述的变焦镜头,其中,在所述透镜B的焦距为fb、并且在广角端所述变焦镜头的焦距为fw的情况下,以下不等式被满足:
-3.5<fb/fw<-0.8。
11.根据权利要求1所述的变焦镜头,其中,在望远端所述变焦镜头的焦距为ft、并且在广角端所述变焦镜头的焦距为fw的情况下,以下不等式被满足:
1.2<ft/fw<2.1。
12.根据权利要求1所述的变焦镜头,其中所述第一透镜单元由三个负透镜和部署在所述三个负透镜的像侧的正透镜组成。
13.根据权利要求1所述的变焦镜头,还包括在最靠近像侧的具有正折光力的透镜单元。
14.根据权利要求1所述的变焦镜头,还包括在最靠近像侧的具有负折光力的透镜单元。
15.根据权利要求3至14中的任一项所述的变焦镜头,其中,在所述透镜B的折光率为NdB的情况下,以下不等式被满足:
1.80<NdB。
16.根据权利要求4至14中的任一项所述的变焦镜头,还包括孔径光阑,其中
在广角端从所述负透镜A的像侧透镜表面到所述孔径光阑的距离为d、并且在广角端所述变焦镜头的焦距为fw的情况下,以下不等式被满足:
2.0<d/fw<15。
17.根据权利要求5至14中的任一项所述的变焦镜头,还包括孔径光阑,其中
在广角端从所述透镜B的像侧透镜表面到所述孔径光阑的距离为d2、并且在广角端所述变焦镜头的焦距为fw的情况下,以下不等式被满足:
1.5<d2/fw<5.0。
18.根据权利要求3至14中的任一项所述的变焦镜头,还包括孔径光阑,其中,在所述透镜B的折光率为NdB、在广角端从所述负透镜A的像侧透镜表面到所述孔径光阑的距离为d、并且在广角端所述变焦镜头的焦距为fw的情况下,以下不等式被满足:
1.80<NdB,以及
2.0<d/fw<15。
19.根据权利要求4至14中的任一项所述的变焦镜头,还包括孔径光阑,其中,在所述透镜B的折光率为NdB、在广角端从所述透镜B的像侧透镜表面到所述孔径光阑的距离为d2、并且在广角端所述变焦镜头的焦距为fw的情况下,以下不等式被满足:
1.80<NdB,以及
2.0<d2/fw<15。
20.根据权利要求5至14中的任一项所述的变焦镜头,还包括孔径光阑,其中,在广角端从所述负透镜A的像侧透镜表面到所述孔径光阑的距离为d、在广角端所述变焦镜头的焦距为fw、并且在广角端从所述透镜B的像侧透镜表面到所述孔径光阑的距离为d2的情况下,以下不等式被满足:
2.0<d/fw<15,以及
1.5<d2/fw<5.0。
21.根据权利要求5至14中的任一项所述的变焦镜头,还包括孔径光阑,其中,在所述透镜B的折光率为NdB、在广角端从所述负透镜A的像侧透镜表面到所述孔径光阑的距离为d、在广角端所述变焦镜头的焦距为fw、并且在广角端从所述透镜B的像侧透镜表面到所述孔径光阑的距离为d2的情况下,以下不等式被满足:
1.80<NdB,
2.0<d/fw<15,以及
1.5<d2/fw<5.0。
22.一种图像捕获装置,包括:
根据权利要求1至14中的任一项所述的变焦镜头;以及
图像拾取设备,所述图像拾取设备被布置为接收由所述变焦镜头形成的图像的光。
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