Decollimation: In a beam with the minimum possible ray divergence or convergence, any mechanism by which rays are caused to diverge or converge from parallelism.
This obviously presents serious problems to a high-speed aircraft pilot and the problem becomes exacerbated as more sleek windscreens are developed in aircraft locating the pilot farther back from a relatively thick windscreen.
Decollimation of the head up display cannot be used as a solution for this problem.
The purpose of this invention is provide an aircraft pilot with the virtual image display that can be made free of symbol position error and pilot discomfort that is always present and uncorrectable when a head up display is used in an aircraft equipped with a curved windscreen.
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