Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1991-09-23
1993-09-28
Henry, Jon W.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359634, 359637, G02B 2710
Patent
active
052490815
ABSTRACT:
This invention is concerned with display apparatus of the Head-Up-Display (H.U.D.) type which finds utility in e.g. fighter aircraft. The invention is concerned with providing an H.U.D. which has a profile depth which is substantially and preferably much less than the diameter of the exit lens. The arrangements of the H.U.D. include a cathode ray tube (C.R.T.) display source, a collimating optical means having a plurality of lenses with at least an entrance lens and an exit lens together with a prism and combining means for combining displayed visual information with the view of the scene or object. The prism is so arranged in relationship to the display source that internal reflection of light from the display source within the prism and transmission of light towards the combining means is such as to enable the modular unit profile depth to be between 40% and 60% less than the exit lens diameter. Embodiments are shown which incorporate compensating means to compensate for CRT mechanical axis tilt at an angle with respect to e.g. the aircraft horizontal.
REFERENCES:
patent: 3732367 (1973-05-01), Teranishi et al.
patent: 4729634 (1988-03-01), Raber
patent: 4832449 (1989-05-01), Mundy et al.
Abstract New Technology "Liquid Crystal Diffraction Optics HUD" Hughes Aircraft Co., Sep. 1977.
Proceeding of the S.I.D., vol. 19, No. 4, 1978, Los Angeles pp. 169-179 "A Head-up Display for the Future".
Davis IV F. Eugene
Henry Jon W.
Pilkington P.E. Limited
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