Optics: image projectors – Target – map or navigation projection
Patent
1977-10-21
1983-10-11
Sheppard, John W.
Optics: image projectors
Target, map or navigation projection
33 1R, 33 1N, G03B 2100, G03B 2110
Patent
active
044088485
ABSTRACT:
Line indicating apparatus is provided which is capable of suspending an elongated line indicator whereby it is movable in a direction substantially perpendicular to its linear axis, and is rotatable around a second axis which is angularly disposed with respect to the linear axis and the said direction of movement. A plurality of the basic apparatus may be arranged in a superimposed relationship, and the resultant plurality of superimposed line indicators may be individually moved and/or rotated to positions wherein they are angularly disposed with respect to each other. Preferably, the line indicators are movable and rotatable in closely adjacent fixed planes so that a substantially distortion-free image thereof may be produced and visually displayed.
The line indicating apparatus is especially useful in navigational charting or plotting, and in navigational devices pertaining thereto. The apparatus is also useful in impressing one or more line indicators or images thereof on or closely adjacent the surface of a chart or chart image, or on visual display devices in general including radar screens or scopes, rear image projectors, and other types of projection systems. In a further embodiment, apparatus is provided for producing and visually displaying an image of a line indicator, such apparatus being suitable for the aforementioned as well as other purposes.
REFERENCES:
patent: 2169532 (1939-08-01), Jensen
patent: 2696610 (1954-12-01), Turley
patent: 3393457 (1968-07-01), Freda
patent: 3696671 (1972-10-01), Steigleder et al.
patent: 3786568 (1974-01-01), Schulte et al.
patent: 3865477 (1975-02-01), Gast
Landingham, Jr. L. S. Van
Sheppard John W.
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