Light collecting and redirecting means

Details Light collecting and redirecting means Light collecting and redirecting means

1984-03-30

1988-08-23

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340365P, 250221, G09G 300

Patent

active

047664240

ABSTRACT:
An improved light collector, for collecting the light in a plurality of parallel light beams directed across the display surface of a touch panel apparatus and for redirecting it in a direction substantially perpendicular to the light beams for detection by a common detector positioned adjacent one end of the collector, comprises an elongated strip of light transmissive material terminated by a light collection station. A plurality of light reflecting elements is disposed inside and spaced along one side of the strip and each has a transverse dimension small in comparison to cross-section of the strip. The surface of each reflecting element is tilted with respect to the longitudinal axis of the strip. A like plurality of focusing elements is also disposed along the strip and each such element is individually associated with an assigned one of the reflecting elements. Each of the focusing elements is oriented and configured to collect light received in a direction substantially perpendicular to the longitudinal axis of the strip and to direct such collected light to its assigned reflecting element. Each of the focusing elements is spaced from its assigned reflecting element a distance such that the reflecting element is positioned at, or close to, the focal plane of its assigned focusing element. Each reflecting element is so tilted as to direct light received from its assigned focusing element to the light collection station.

REFERENCES:
patent: 3060319 (1962-10-01), Greunke
patent: 3611359 (1971-10-01), Panerai et al.
patent: 3775560 (1973-11-01), Ebeling et al.
patent: 4305071 (1981-12-01), Bell et al.
patent: 4320292 (1982-03-01), Oikawa et al.
patent: 4459476 (1984-07-01), Weissmueller et al.

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