Abstract
A beam-combining cube has been incorporated into the eyelens of a simple magnifier type eyepiece in order that a collimated virtual image of a cathode ray tube presentation may be seen superimposed upon the normal direct view of the observer's environment. This unique prism !eyepiece configuration has facilitated the design of high resolution head-mounted optical displays with apparent fields of view as large as 40° while minimizing the physical size of the projection optics. By use of moderately high index glass in the prism, a significant reduction in lens aperture as compared to that required with the equivalent beam-combining mirror arrangement can be achieved. The major features of this special eyepiece are discussed and some useful applications of the device are described.
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