APLANATIC IMAGE COMBINER FOR USE IN PROJECTION TELEVISION SYSTEMS.

摘要

the image unit receives the images of the three cathode ray tubes (11, 12, 13), each with a concave surface to the fluorescent layer (11a, 12a, 13a) to produce images. these concave surfaces produce images having a concave image matching.the images are combined by a dichroic mirror (17), and guided along a projection axis (8). the unit includes an image aplanaire convex lens (19) having an outer surface symmetrical with each of concave curve surface of cathode ray tubes, producing the images.one side of the lens is flat and in optical communication with the dichroic mirrors. an immersion medium (16) is used for forming a space between the cathode ray tubes with constant optical image input and output lens, in order to eliminate the optical boundary.