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159 条记录 (耗时 0.026 秒)

    System and device for overhead projection
    71.
    发明授权
    System and device for overhead projection 失效
    用于架空投影的系统和装置

    公开(公告)号：US4002408A

    公开(公告)日：1977-01-11

    申请号：US205832

    申请日：1971-12-10

    申请人： Michito Amma

    发明人： Michito Amma

    IPC分类号： G03B21/132

    CPC分类号： G03B21/132 ,  Y10S353/03

    摘要： In a system of overhead projection there is provided a horizontal stage on which is to be placed an object to be imaged. Means for illuminating the object is mounted below the stage at an angle thereto, while a projection lens system is installed above the stage and parallel thereto, in such a position that the axis of the light from the illumination means passes at an angle through its center. A mirror mounted above the lens system projects the undistorted image of the object onto a vertical screen. In another system of overhead projection based on the same principles, the stage and the projection lens system are inclined relative to the illumination means while themselves kept parallel to each other. The axis of the light from the illumination means in this instance extends vertically upwardly and passes at an angle through the center of the lens system. There are further disclosed herein some overhead projectors constructed in accordance with these systems of the invention.

    摘要翻译： 在一种架空投影系统中，提供了一个水平台，放置一个待成像物体。 用于照亮物体的装置以与其成角度安装在舞台下方，同时投影透镜系统安装在舞台上方并与其平行的位置，使得来自照明装置的光的轴线以一定角度穿过其中心 。 透镜系统上方的镜子将物体的未失真图像投影到垂直屏幕上。 在另一个基于相同原理的俯仰投影系统中，舞台和投影透镜系统相对于照明装置倾斜，同时它们彼此保持平行。 在这种情况下，来自照明装置的光的轴线垂直向上延伸并且以一定角度穿过透镜系统的中心。 此外还公开了根据本发明的这些系统构造的一些架空投影仪。

    Overhead projector apparatus
    73.
    发明授权
    Overhead projector apparatus 失效
    OVERHEAD PROJECTOR APPARATUS

    公开(公告)号：US3827797A

    公开(公告)日：1974-08-06

    申请号：US34739273

    申请日：1973-04-02

    申请人： EAVES R

    发明人： EAVES R

    IPC分类号： G03B15/08 ,  G03B21/132 ,  G03B21/00 ,  G09F13/34

    CPC分类号： G03B15/08 ,  G03B21/132 ,  Y10S353/03 ,  Y10S353/05

    摘要： An adapter or attachment mechanism is presented for use in a standard overhead projector whereby displays having the illusion of motion can be projected. The adapter has a transparent display platform which houses a movable dot patterned activator sheet and has a dot patterned art sheet on the platform, with this assembly being positioned over the normal light table or display deck of an overhead projector. Transmission of light through the adapter assembly coincidentally with movement of the activator sheet result in the projection of a display having the illusion of motion.

    摘要翻译： 呈现用于标准高架投影仪的适配器或连接机构，由此能够投射具有运动错觉的显示器。 适配器具有透明的显示平台，其容纳可移动点图案化的激活器片材，并且在平台上具有点状图案化的片材，该组件位于高架投影仪的普通的光台或展示台面上。 透过适配器组件的光透过激活器片的移动而导致具有运动错觉的显示器的投射。

    Overhead projector
    74.
    发明授权
    Overhead projector 失效
    难搞的项目

    公开(公告)号：US3752575A

    公开(公告)日：1973-08-14

    申请号：US3752575D

    申请日：1972-10-16

    申请人： RICOH KK

    发明人： ATAKA H

    IPC分类号： G03B21/132 ,  G03B21/14 ,  G03B21/28

    CPC分类号： G03B21/132 ,  Y10S353/03 ,  Y10S353/06

    摘要： An improved overhead projector capable of employing a smaller sized reflecting mirror, thereby making the projector compact in size, wherein a Fresnel condenser lens system, which serves as the stage or is disposed adjacent to a stage, comprises at least two Fresnel lenses having different widths and/or different focal lengths so that the light beams refracted by the different Fresnel lenses may be made incident at different angles upon the projection lens and thus upon the surface of the reflecting mirror, particularly the upper half portion, thereby permitting the reflecting mirror to be shortened. Individual light sources may be used for respective Fresnel lenses so that they may be moved closer together further decreasing the size of the projector.

    摘要翻译： 一种改进的高架投影仪，其能够采用较小尺寸的反射镜，从而使投影机尺寸更小，其中用作舞台或邻近舞台的菲涅耳聚光透镜系统包括至少两个具有不同宽度的菲涅尔透镜 和/或不同的焦距，使得由不同菲涅尔透镜折射的光束可以以不同的角度入射到投影透镜上，并因此在反射镜的表面，特别是上半部分上，从而允许反射镜 缩短。 各个光源可以用于各自的菲涅尔透镜，使得它们可以更靠近地移动，进一步减小投影仪的尺寸。

    Dual magnification projection lens
    75.
    发明授权
    Dual magnification projection lens 失效
    双倍放大投影镜头

    公开(公告)号：US3675998A

    公开(公告)日：1972-07-11

    申请号：US3675998D

    申请日：1970-10-29

    申请人： AMERICAN OPTICAL CORP

    发明人： WILTON HENRY T

    IPC分类号： G02B15/00 ,  G02B27/18

    CPC分类号： G02B15/00 ,  Y10S353/03

    摘要： A TWO-ELEMENT PROJECTION LENS IN WHICH ONE ELEMENT IS SWINGABLY MOUNTED ON AN AXIS PERPENDICULAR TO THE OPTICAL PATH. WHEN THE TWO LENS ELEMENTS ARE POSITIONED ADJACENT EACH OTHER, THEY COMPRISE A LENS HAVING A GIVEN FOCAL LENGTH TO EFFECT A CERTAIN MAGNIFICATION. WHEN THE TWO LENS ELEMENTS ARE SEPARATED BY SWINGING ONE TO AN ALTERNATE POSITION IN THE OPTICAL PATH, THE COMBINED LENS HAS A DIFFERENT FOCAL LENGTH TO EFFECT A DIFFERENT MAGNIFICATION.