Rear projection viewer having auxiliary viewing screen

摘要

A rear projection viewer apparatus of the type wherein a projected image is projected towards a primary viewing screen forming the front of the viewer, the front viewing screen being removably located with respect to other portions of the viewer housing so that it may be removed from the path of the projected images. A second rear projection screen substantially smaller than the first screen is provided. The small screen and selected portions of the viewer housing are provided with complementary structure for selectively locating the second screen at an operative position substantially normal to the projection axis and at a location therealong substantially closer to the image projecting means than the first rear projection screen when it is in its operative position.