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公开(公告)号：US4776679A
公开(公告)日：1988-10-11
申请号：US872139
申请日：1986-06-09
IPC分类号： G02B15/14 , G02B3/00 , G02B15/16 , G02B15/173
CPC分类号： G02B15/173
摘要： A variable focal length objective of which at least one of a pulrality of lens units is moved to vary the image magnification, wherein at least one of the plurality of lens units has at least one refractive index distribution type lens provided with a condition of N.sub.1 >0 as, taking the distance from the optical axis to a radial direction as h, the refractive index distribution is expressed by N(h)=N.sub.0 +N.sub.1 h.sup.2 +N.sub.2 h.sup.4 +N.sub.3 h.sup.6 +. . . (N.sub.0, N.sub.1, N.sub.2 . . . are constants), and satisfies the following conditions: ##EQU1## where fmax: the maximum focal length;fmin: the minimum focal length;Lmin: the optical total length when the total length is shortest;Y: the maximum image height;N.sub.1 *: the coefficient of h.sup.2 of the refractive index distribution type lens having a refractive index distribution of N.sub.1 >0;D*: the lens thickness of the refractive index distribution type lens having the refractive index distribution of N.sub.1 >0.
摘要翻译： 可变焦距物镜，其中移动透镜单元的脉冲中的至少一个以改变图像放大率，其中多个透镜单元中的至少一个具有至少一个折射率分布型透镜，其具有N1> 0，从光轴到径向的距离为h，折射率分布由N（h）= N0 + N1h2 + N2h4 + N3h6 +表示。 。 。 （N0，N1，N2 ...是常数），满足以下条件：
SIGMA 2N1 * D *> 0.2 / fmin其中fmax：最大焦距; fmin：最小焦距; Lmin：总长度最短时的光学总长度; Y：最大图像高度; N1 *：折射率分布为N1> 0的折射率分布型透镜的h2的系数; D *：折射率分布为N1> 0的折射率分布型透镜的透镜厚度。 -
公开(公告)号：US5011272A
公开(公告)日：1991-04-30
申请号：US329588
申请日：1989-03-27
IPC分类号： G02B15/16
CPC分类号： G02B15/161
摘要： A zoom lens including at least two lens units of which the front one is of positive refractive power and the rear one is of negative refractive power, the units being axially movable to decrease their separation in zooming from the wide angle to the telephoto end. At least one of the lens units is provided with at least one refractive index distribution type lens arranged on a common optical axis of the other lenses in order to achieve a great advance in compactness.
摘要翻译： 一种变焦透镜，包括至少两个透镜单元，前者具有正折射光焦度，后一个具有负折光力，该单元可轴向移动以减小其从广角变焦到望远端的分离。 透镜单元中的至少一个设置有至少一个折射率分布型透镜，其布置在其它透镜的公共光轴上，以便实现紧凑性的大的进步。
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公开(公告)号：US5054898A
公开(公告)日：1991-10-08
申请号：US800553
申请日：1985-11-21
IPC分类号： G02B15/08
CPC分类号： G02B15/08
摘要： A zoom lens comprising a plurality of lens units in which at least one of the air separations between the units is varied to effect zooming, whereby at least one of the plurality of lens units is included with at least one refractive index distribution type lens element on a common optical axis of the other elements.
摘要翻译： 一种变焦透镜，包括多个透镜单元，其中，所述单元中的空气分离中的至少一个被改变以实现变焦，由此多个透镜单元中的至少一个透镜单元包括至少一个折射率分布型透镜元件 其他元素的共同光轴。
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公开(公告)号：US4907866A
公开(公告)日：1990-03-13
申请号：US847236
申请日：1986-04-02
IPC分类号： G02B15/177
CPC分类号： G02B15/177
摘要： An objective of variable focal length includes a plurality of lens units of which the first, counting from front, is of negative power and the second is of positive power. At least the first and second lens units are moved with variation of the air separation therebetween to vary the focal length of the entire system. The objective is characterized in that at least one of the lens units is included with at least one refractive index distribution type lens arranged on the common optical axis of the other lenses.
摘要翻译： 可变焦距的目的包括多个透镜单元，其中第一个从前面计数是负功率的，第二个具有正的功率。 至少第一和第二透镜单元随着它们之间的空气间隔的变化而移动，以改变整个系统的焦距。 其目的在于，透镜单元中的至少一个包括配置在其它透镜的公共光轴上的至少一个折射率分布型透镜。
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公开(公告)号：US4842386A
公开(公告)日：1989-06-27
申请号：US877102
申请日：1986-06-23
IPC分类号： G02B15/163 , G02B15/16 , G02B15/173
CPC分类号： G02B15/173
摘要： A variable focal length objective having a plurality of lens units with at least one unit separation being varied to vary the focal length of the entire system, in which at least one of the plurality of lens units has at least gradient-index lens having a refractive index distribution of the form: N(h)=N.sub.0 +N.sub.1 h.sup.2 +N.sub.2 h.sup.4 +N.sub.3 h.sup.6 + . . . where h is the height from the optical axis, N.sub.0 is the refractive index on the optical axis, and N.sub.1, N.sub.2, N.sub.3, . . . are constants, satisfying the following conditions:.phi..sub.G .multidot.N.sub.1
摘要翻译： 具有具有至少一个单位间隔的多个透镜单元的可变焦距物镜被改变以改变整个系统的焦距，其中多个透镜单元中的至少一个具有至少具有折射率的梯度折射率透镜 形式的索引分布：N（h）= N0 + N1h2 + N2h4 + N3h6 +。 。 。 其中h是光轴的高度，N0是光轴上的折射率，N1，N2，N3。 。 。 是满足以下条件的常数：phi GxN1 <0 Kx phi GxN2 <0其中，phi G是具有该梯度折射率透镜的透镜单元的屈光度，并且当曲率越强时，K为+1或-1 该梯度折射率透镜的两个表面分别对空气是凸的或凹的。
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公开(公告)号：US4810070A
公开(公告)日：1989-03-07
申请号：US901059
申请日：1986-08-26
IPC分类号： G02B9/00 , G02B3/00 , G02B9/02 , G02B15/16 , G02B15/167 , G02B15/173 , G02B15/14
CPC分类号： G02B3/0087 , G02B15/16
摘要： A lens system has a lens unit comprising a positive lens and a negative lens. The positive lens has an index distribution in the direction of the optic axis. The value of the index gradient for a light having a short wavelength in the vicinity of the vertex of at least one convex surface of the positive lens is smaller than the value of the index gradient for a light having a long wavelength.
摘要翻译： 透镜系统具有包括正透镜和负透镜的透镜单元。 正透镜在光轴方向上具有折射率分布。 在正透镜的至少一个凸面的顶点附近具有短波长的光的折射率梯度的值小于具有长波长的光的折射率梯度的值。
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公开(公告)号：US5739961A
公开(公告)日：1998-04-14
申请号：US474186
申请日：1995-06-07
IPC分类号： G02B15/173 , G02B15/14
CPC分类号： G02B15/173
摘要： A zoom lens includes, from front to rear, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power and a fourth lens unit having a positive refractive power, at least the second and fourth lens units being moved to effect zooming, wherein the maximum image angle is increased while the diameter of the first lens unit is extremely reduced.
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公开(公告)号：US5784205A
公开(公告)日：1998-07-21
申请号：US483850
申请日：1995-06-07
IPC分类号： G02B15/173 , G02B15/14
CPC分类号： G02B15/173
摘要： A zoom lens includes, from front to rear, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power and a fourth lens unit having a positive refractive power, at least the second and fourth lens units being moved to effect zooming, wherein the maximum image angle is increased while the diameter of the first lens unit is extremely reduced.
摘要翻译： 变焦透镜从前到后具有正屈光力的第一透镜单元，具有负屈光力的第二透镜单元，具有正折光力的第三透镜单元和具有正折光力的第四透镜单元， 至少第二和第四透镜单元被移动以实现变焦，其中最大图像角度增加，而第一透镜单元的直径极大地减小。
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公开(公告)号：US5754346A
公开(公告)日：1998-05-19
申请号：US684726
申请日：1996-07-22
IPC分类号： G02B15/173 , G02B15/14
CPC分类号： G02B15/173
摘要： A zoom lens of the rear focus type including, from an object side to an image side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power having a stop, and a fourth lens unit of positive refractive power. During zooming from a wide-angle end to a telephoto end, the second lens unit is moved toward the image side, the third lens unit and the stop are moved in unison in a locus convex toward the object side, and the fourth lens unit is moved in a locus convex toward the object side. During focusing, the fourth lens unit is moved, and the following condition is satisfied: -0.3
摘要翻译： 后焦点类型的变焦透镜包括从物体侧到像侧的正屈光力的第一透镜单元，负折光力的第二透镜单元，具有光阑的正屈光力的第三透镜单元，以及 正屈光力的第四透镜单元。 在从广角端到望远端的变焦期间，第二透镜单元朝向像侧移动，第三透镜单元和止挡在朝向物体侧凸出的轨迹中一致地移动，并且第四透镜单元 在朝向物体侧凸出的轨迹中移动。 在聚焦期间，移动第四透镜单元，并且满足以下条件：-0.3
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公开(公告)号：US06081389A
公开(公告)日：2000-06-27
申请号：US123442
申请日：1998-07-28
IPC分类号： G02B13/04 , G02B15/177 , G02B15/14 , G02B5/18
CPC分类号： G02B13/22 , G02B13/04 , G02B15/177
摘要： A zoom lens of the retrofocus type includes, in order from a longer-distance conjugate point side to a shorter-distance conjugate point side, a front lens unit of negative refractive power, and a rear lens unit of positive refractive power, wherein a separation between the front lens unit and the rear lens unit varies according to variation of magnification, and at least one of the front lens unit and the rear lens unit is provided with a diffractive optical element.
摘要翻译： 后焦点类型的变焦镜头包括从较长距离共轭点侧到较短距离共轭点侧依次具有负屈光力的前透镜单元和正屈光力的后透镜单元，其中分离 前透镜单元和后透镜单元之间根据放大率的变化而变化，并且前透镜单元和后透镜单元中的至少一个设置有衍射光学元件。
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