WIDE ANGLE OPTICAL PROJECTION SYSTEM.
Final research rept. pt. 1,
GENERAL ELECTRIC CO JOHNSON CITY NY LIGHT MILITARY ELECTRONICS DEPT
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An optical design study was undertaken with the objective of conceiving and proving feasibility of an optical system which would provide a 25 degree binocular field of view for a typical head-up aircraft cockpit display. Preliminary work in evaluation of several novel concepts showed that a system using two concave ellipsoidal reflectors with a common focus and several refracting elements showed considerable promise. Existing computer programs were not adequate to evaluate the image-forming capability of such a system. It was found that in order to extend the state of the art of wide angle display systems, it would first be necessary to extend the state of the art of optical design. A new computer program was developed which permitted the design, automatic correction and the evolution of this complex type of optical system. During the design phase, two similar solutions were generated, both of which demonstrated the feasibility of a 25 degree field. The evaluation of these solutions and detailed design data is included in this report. An engineering model, using two ellipsoids and a projection lens, was constructed. A description of the model and its performance is presented herein. Author