公开(公告)号：US4978218A

公开(公告)日：1990-12-18

申请号：US486971

申请日：1990-03-01

申请人： Robert S. Carpenter ,  Dennis J. Roden ,  Ernesto M. Rodriguez

发明人： Robert S. Carpenter ,  Dennis J. Roden ,  Ernesto M. Rodriguez

IPC分类号： G03B21/132

CPC分类号： G03B21/132 ,  Y10S353/04

摘要： A portable overhead projector having a folding arm. The arm and a torque member are pivotally attached to the projector head, forming a four bar linkage. When the arm is moved from an upright, operative position to a storage position, the projector head rotates so as to be flush with the base of the projector, making the projector more compact for storage. An adjustment mechanism is also provided to automatically open and close a mirror which is attached to the projector head, simplifying the set up procedure of the overhead projector.

公开(公告)号：USD333829S

公开(公告)日：1993-03-09

申请号：US600215

申请日：1990-10-18

申请人： James E. Nash ,  Dennis J. Roden

设计人： James E. Nash ,  Dennis J. Roden

公开(公告)号：US5135301A

公开(公告)日：1992-08-04

申请号：US643474

申请日：1991-01-22

申请人： John F. Dreyer, Jr. ,  Dennis J. Roden

发明人： John F. Dreyer, Jr. ,  Dennis J. Roden

IPC分类号： G03B21/132 ,  G03B21/20

CPC分类号： G03B21/132 ,  G03B21/145 ,  G03B21/2013 ,  G03B21/2066 ,  Y10S353/04

摘要： A reflective overhead projector is provided with two lamps for the purpose of allowing change from one to the other of the lamps in the event of expiration of the lamp in use. The lamps are arranged to face the center of a circle at which is positioned a rotatable planar mirror which may be turned to direct light from a desired one of the two lamps. An electrical switch senses the position of the mirror and directs electrical power to the appropriate lamp.

摘要翻译： 反射式高架投影仪具有两个灯，用于在使用中的灯的过期时允许从一个灯到另一个灯的变化。 灯被布置为面向圆的中心，在该中心处设置有可旋转的平面镜，其可以被转动以引导来自两个灯中期望的一个的光。 电开关感测反射镜的位置并将电力引导到适当的灯。