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。