Optics: image projectors – Plural projection paths with single light source
Patent
1976-01-21
1979-10-30
Sacher, Paul A.
Optics: image projectors
Plural projection paths with single light source
353 7, 353 8, 340 27NA, G02B 2722, G02B 2726
Patent
active
041726324
ABSTRACT:
Spaced-apart light sources, a screen and means for restricting light from each source to separate eyes of each observer cause perception of a seemingly solid or three-dimensional shadow of an object or objects. The shadow is detached from the object and does not necessarily appear to be in the plane of the screen but may be perceived as floating in space in front of the observers. The seemingly solid shadows of objects including active human performers or even an observer may be caused to appear to be within the context of a previously filmed 3D still or motion picture scene. The system may be used for purposes additional to creating unique entertainment effects. The navigation of aircraft including instrument landing system approaches to airports is greatly facilitated by creating a realistic three-dimensional shadow depiction of an airport landing runway or the like in front of the pilot and by providing mechanisms, responsive to conventional radio and gyro instrument signals, which cause the apparent orientation, location and distance of the depictured airport to change as necessary to conform with the actual disposition of a real airport relative to the real aircraft. Instead of having to mentally translate data from dials, pointers and the like of conventional instrument flight aids, the pilot need only fly the depicted aircraft to the depicted airport using the controls of the real aircraft. At the final stages of landing, the pilot may look up to perceive the real airport in the same spatial relationship to the real aircraft as was the depicted airport to the depicted aircraft. Realistic 3D images of earth surface features, compass headings, localizer course line, glide slope markers and the like may also be presented in the artificial scene to further assist navigation.
REFERENCES:
patent: 2218875 (1940-10-01), Parsell
patent: 2883906 (1959-04-01), Rehorn
patent: 3827793 (1974-08-01), Dudley
R. L. Gregory, Nature, vol. 203, pp. 1407-1408, "Stereoscopic Shadow Images" , 9/26/64.
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