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公开(公告)号：US4789880A
公开(公告)日：1988-12-06
申请号：US74052
申请日：1987-07-16
摘要： A focusing device for use in micro film readers or the like for projecting micro images to give in-focus conditon exactly and readily. The present device includes a memory for storing a distance data representing the distance between an original and a projective lens at in-focus position thereof, and a sensor for measuring the distance between an original and the projective lens wherein the projective lens is moved to the in-focus position by a focusing motor in response to the distance data stored in the memory and a signal representing the measured distance generated from the sensor.
摘要翻译： 一种用于微型读取器等的聚焦装置，用于投影微图像以准确且容易地提供对焦条件。 本装置包括：存储器，用于存储表示在其对焦位置处的原件和投影镜头之间的距离的距离数据;以及用于测量原稿和投影透镜之间的距离的传感器，其中投影透镜移动到 通过聚焦电机响应存储在存储器中的距离数据的对焦位置和表示从传感器产生的测量距离的信号。
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公开(公告)号：US4880292A
公开(公告)日：1989-11-14
申请号：US222797
申请日：1988-07-22
IPC分类号： G03B21/62
CPC分类号： G03B21/625
摘要： A light-transmission viewing screen for displaying an optical image from a beam of light projected thereon along a predetermined path of light provided rearwardly of the screen, the viewing screen having a virtual center axis extending toward a viewer's viewing position, the light-transmission viewing screen comprising a transparent or translucent transmission screen plate through which to transmit the beam of light, and a transmission grating located on at least a portion of one of the surfaces of the transmission screen plate for diffracting the beam of light toward a location substantially aligned with the virtual center axis of the viewing screen when the beam of light is transmitted through the transmission grating.
摘要翻译： 一种透光观察屏幕，用于沿着从屏幕的后方沿着预定的光路投射的光束显示光学图像，观看屏幕具有朝向观看者的观看位置延伸的虚拟中心轴，透光观察 屏幕，其包括用于透射光束的透明或半透明透明屏板，以及位于透射屏板的一个表面的至少一部分上的透射光栅，用于将光束衍射到基本上与 当光束通过透射光栅传播时，观察屏幕的虚拟中心轴线。
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公开(公告)号：US06285507B1
公开(公告)日：2001-09-04
申请号：US09404077
申请日：1999-09-23
申请人： Keijiro Sakamoto
发明人： Keijiro Sakamoto
IPC分类号： G02B300
CPC分类号： G02B27/4211 , G02B13/24 , G02B27/0037 , G02B27/4277
摘要： An optical system for focusing an original image on an image sensor has an optical element disposed at the image-sensor-side end thereof. The optical element has a positive optical power as a whole, and at least one surface of the optical element has a positive optical power of diffraction.
摘要翻译： 用于将原始图像聚焦在图像传感器上的光学系统具有设置在其图像传感器侧端部的光学元件。 光学元件整体具有正光焦度，并且光学元件的至少一个表面具有正的衍射光学功率。
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公开(公告)号：US5623370A
公开(公告)日：1997-04-22
申请号：US513415
申请日：1995-08-10
CPC分类号： G02B3/0087
摘要： A radial gradient index lens system has a refractive index distribution. The refractive index decreases from an optical axis along a height. The lens system has two meniscus lens elements whose convex surfaces have a larger radius of curvature than concave surfaces. The meniscus lens elements are arranged symmetrically with respect to an aperture stop so that the convex surfaces thereof face an object side and an image side, respectively. The gradient index lens system is for use in a copying apparatus or as a reading optical system.
摘要翻译： 径向梯度折射率透镜系统具有折射率分布。 折射率从沿着高度的光轴减小。 透镜系统具有两个弯月透镜元件，其凸表面具有比凹面更大的曲率半径。 弯月透镜元件相对于孔径光阑对称地布置，使得其凸面分别面向物体侧和像侧。 梯度折射率透镜系统用于复印设备或读取光学系统。
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公开(公告)号：US5602680A
公开(公告)日：1997-02-11
申请号：US374132
申请日：1995-01-18
申请人： Keijiro Sakamoto
发明人： Keijiro Sakamoto
IPC分类号： G02B15/16 , G02B15/177 , G02B15/14
CPC分类号： G02B15/177
摘要： A finite conjugate distance zoom lens system includes sequentially from the enlarging side a first lens group having a negative refracting power and a second lens group having a positive refracting power. The second lens group consists of sequentially from the enlarging side two or three positive lens elements, first and second cemented lenses, a negative lens element, and a positive lens element. Both of the first and second lenses consist of cemented biconvex lens element and negative lens element. During a zooming operation from the maximum focal length edge to the minimum focal length edge, the first lens group shifts from the enlarging side to the reducing side on the maximum focal length side and shifts from the reducing side to the enlarging side on the minimum focal length side. On the other hand, the second lens group monotonously shifts from the enlarging side to the reducing side during the zooming operation.
摘要翻译： 有限共轭距离变焦透镜系统从放大侧依次包括具有负折射率的第一透镜组和具有正折射光焦度的第二透镜组。 第二透镜组从放大侧依次包括两个或三个正透镜元件，第一和第二胶合透镜，负透镜元件和正透镜元件。 第一透镜和第二透镜都由胶合双凸透镜元件和负透镜元件组成。 在从最大焦距边缘到最小焦距边缘的变焦操作期间，第一透镜组在最大焦距侧从放大侧移动到减影侧，并且在最小焦距处从缩小侧向放大侧移动 长边。 另一方面，在变焦操作期间，第二透镜组从扩大侧单独移动到缩小侧。
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公开(公告)号：US5204780A
公开(公告)日：1993-04-20
申请号：US794355
申请日：1991-11-12
申请人： Keijiro Sakamoto
发明人： Keijiro Sakamoto
摘要： A three group, three component lens system comprising, in order from one side a first, positive meniscus lens defining a convex surface directed to an object, a second, biconcave lens, and a third, biconvex lens. At least one of the three lenses is formed of plastic. It is recommended to satisfy the following conditional expression:0.1 f
摘要翻译： 一种三组三分量透镜系统，其从一侧依次包括限定朝向物体的凸面的第一正弯月形透镜，第二双凹透镜和第三双凸透镜。 三个透镜中的至少一个由塑料形成。 建议满足以下条件表达式：0.1f
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公开(公告)号：US06275342B1
公开(公告)日：2001-08-14
申请号：US09020570
申请日：1998-01-27
IPC分类号： G02B1514
CPC分类号： G02B15/177
摘要： A zoom lens system consists of, in order from the enlargement side to the reduction side, a first lens unit having a negative optical power and a second lens unit having a positive optical power. In the zoom lens system, either the first or the second lens unit has at least one surface having an optical power of diffraction.
摘要翻译： 变焦透镜系统从放大侧到缩小侧依次包括具有负光焦度的第一透镜单元和具有正光焦度的第二透镜单元。 在变焦透镜系统中，第一透镜单元或第二透镜单元具有至少一个具有衍射光学功率的表面。
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公开(公告)号：US06172818B2
公开(公告)日：2001-01-09
申请号：US09333906
申请日：1999-06-16
申请人： Keijiro Sakamoto
发明人： Keijiro Sakamoto
IPC分类号： G02C1514
CPC分类号： G02B27/4211 , G02B15/177 , G02B27/0037 , G02B27/4216 , G02B27/4277
摘要： A zoom lens system has, from the enlargement side, a first lens unit having a negative optical power and having a lens element including a diffractive optical surface, a second lens unit having a positive optical power, and a third lens unit. Zooming is performed by varying the distances among the first through third lens units. The following conditions are fulfilled: |&phgr;Dn/&phgr;1|
摘要翻译： 变焦透镜系统从放大侧具有具有负光焦度的第一透镜单元和具有包括衍射光学表面的透镜元件，具有正光焦度的第二透镜单元和第三透镜单元。 通过改变第一至第三透镜单元之间的距离来进行变焦。 满足以下条件：其中phiDn表示第一透镜单元的衍射光焦度，phi1表示包括衍射光学表面的透镜元件的折射光焦度，phin表示衍射和屈光光焦度的复合光焦度 第一透镜单元，phiW表示在最短焦距条件下整个透镜系统的衍射和折射光焦度的复合光焦度。
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公开(公告)号：US5050973A
公开(公告)日：1991-09-24
申请号：US465925
申请日：1990-01-16
申请人： Keijiro Sakamoto
发明人： Keijiro Sakamoto
摘要： A symmetrical lens system comprising, as arranged from the object side toward the image side, a first lens in the form of a positive meniscus lens having its convex surface directed toward the object side, a second lens in the form of a negative meniscus lens having its convex surface directed toward the object side, a diaphragm, a third lens in the form of a negative meniscus lens symmetrical with the second lens with respect to the diaphragm, and a fourth lens in the form of a positive meniscus lens symmetrical with the first lens with respect to the diaphragm. At least, the concave surface of the first lens and the fourth lens is aspherical.
摘要翻译： 一种对称透镜系统，包括从物体侧朝向像侧布置呈凸面朝向物体侧的正弯月透镜形式的第一透镜，具有负弯月形透镜形式的第二透镜，具有 其凸面朝向物体侧，隔膜，与第二透镜相对于隔膜对称的负弯月形透镜形式的第三透镜和与第一透镜对称的正弯月透镜形式的第四透镜 透镜相对于隔膜。 至少，第一透镜和第四透镜的凹面是非球面的。
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