Overhead projector with video output.

摘要

An overhead projector (OHP) which provides simultaneous video output of the image which is being projected on the projection screen. The OHP has a projector head (14) which contains conventional optical components (lenses 40,42) for projecting an image from the stage of the OHP to the projection screen, and further contains a partially silvered mirror (38) which passes a portion of the image to a video camera (30) located within the projector head (14). The camera (30) converts the visual information into an electronic signal in standard video format, which may then be transmitted to local or remote auxiliary displays. <IMAGE>