公开(公告)号：US4882599A

公开(公告)日：1989-11-21

申请号：US174842

申请日：1988-03-29

申请人： Peter-Hein Grunwald

发明人： Peter-Hein Grunwald

IPC分类号： G02F1/133 ,  G03B21/132 ,  G03B21/16

CPC分类号： G02F1/133385 ,  G03B21/132 ,  G03B21/16 ,  Y10S353/05

摘要： An overhead projector comprises a housing having a top comprising a Fresnel lens and a writing plate overlying the Fresnel lens. A light source in the housing directs light up through the Fresnel lens and writing plate. A support arm projecting up from the rear of the housing supports an objective lens and a deflection mirror in position to project light from the writing plate onto a wall or screen. A liquid crystal indicating or display device overlies the writing plate and is spaced from the writing plate to provide an air flow space between the writing plate and the liquid crystal indicating device. A fan or blower in the projector housing draws air through the air flow space between the liquid crystal indicating device and the writing plate to cool the liquid crystal indicating device and also produces air flow in the projector housing to cool the light source and other components in the housing. The projector may also have a computer and keyboard for controlling the liquid crystal indicating device. In this case, the liquid crystal indicating device is slidable or swingable between a position overlying the writing plate and a position and a position overlying the keyboard.

摘要翻译： 高架投影仪包括具有顶部的壳体，该顶部包括菲涅尔透镜和覆盖菲涅耳透镜的书写板。 外壳中的光源通过菲涅尔透镜和书写板引导点亮。 从壳体后部突出的支撑臂支撑物镜和偏转镜，以将来自书写板的光投射到墙壁或屏幕上。 液晶指示或显示装置覆盖书写板并且与书写板间隔开，以在书写板和液晶显示装置之间提供空气流动空间。 投影机壳体中的风扇或鼓风机通过液晶显示装置和书写板之间的空气流动空间吸入空气，以冷却液晶显示装置，并且还在投影仪外壳中产生空气流以将光源和其它部件 住房。 投影仪还可以具有用于控制液晶显示装置的计算机和键盘。 在这种情况下，液晶显示装置可在位于书写板上方的位置与覆盖键盘的位置之间滑动或摆动。

公开(公告)号：US4880303A

公开(公告)日：1989-11-14

申请号：US155202

申请日：1988-02-12

申请人： Peter-Hein Grunwald

发明人： Peter-Hein Grunwald

IPC分类号： G03B21/132

CPC分类号： G03B21/132 ,  Y10S353/03

摘要： An overhead projector comprises a housing the upper side of which is closed by a transparent writing plate under which there is a Fresnel lens. A lamp in the housing is provided with a cold light reflector and a condenser lens for directing light upwardly through the Fresnel lens and writing plate. A projection head mounted above the writing plate on a support arm extending up from the rear side of the housing and comprising an objective lens and a deflection mirror directs the light received from the lamp through the Fresnel lens and writing plate onto a projection screen. A liquid crystal display in a frame hingedly mounted on the rear side of the housing can be swung between an operative position overlying, but spaced from the writing plate and an idle position up against the support arm where it is held by a magnet. The liquid crystal display is controlled by a computer disposed in the housing and fed from a common power supply for the lamp and a ventilating fan located in the housing for cooling the lamp, computer and liquid crystal display. The support arm is hinged so that it can be swung down to a travel position overlying the liquid crystal display and may be recessed on its forward side to accommodate the liquid crystal display.

摘要翻译： 高架投影仪包括壳体，其上侧由透明书写板封闭，在该底板下面有菲涅尔透镜。 壳体中的灯具有冷光反射器和用于将光向上引导通过菲涅耳透镜和书写板的聚光透镜。 安装在书写板上方的支撑臂上的投影头，该支撑臂从壳体的后侧向上延伸并且包括物镜和偏转镜，将从灯接收的光通过菲涅尔透镜和书写板引导到投影屏幕上。 铰链安装在壳体后侧的框架中的液晶显示器可以在覆盖但与书写板间隔开的操作位置和与支撑臂相对的空闲位置之间摆动，在该位置处由磁体保持。 液晶显示器由设置在壳体中的计算机控制，并从用于灯的公共电源供给，并且设置在壳体中的用于冷却灯，计算机和液晶显示器的通风扇。 支撑臂被铰接，使得其可以向下摆动到覆盖液晶显示器的行进位置，并且可以在其前侧凹入以容纳液晶显示器。