Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1981-06-15
1982-12-14
Trafton, David L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
178 18, 250226, 250237R, 340707, G08B 536
Patent
active
043640354
ABSTRACT:
A position control system employing a movable detector means which slides over a surface having passive, position related marks of two colors. In the preferred embodiment, the detector means includes a light source which sequentially alternates between one color and the other. A four-quadrant light detector is positioned for receiving the light reflected from the two groups of lines. By clocking emission of the two colors and the detector output signal, electrical outputs are obtained representing reflection from the first and second groups of lines. Such signals are used to establish line crossings, thereby deriving a position signal for a cursor or the like. In an alternate embodiment, continuous sources of the two colors are used to illuminate the lines. Two dual-segment detectors, each sensitive to one of the colors, are used to generate outputs indicative of line crossings, thereby deriving the position signal for a cursor.
REFERENCES:
patent: 3182291 (1965-05-01), Nassimbene
patent: 3297879 (1967-01-01), Meyer
patent: 3298015 (1967-01-01), Herman
patent: 3344700 (1967-10-01), Brake
patent: 3541541 (1970-11-01), Engelbart
patent: 3586861 (1971-06-01), Wernikoff
patent: 4040741 (1977-08-01), Swift
patent: 4184044 (1980-01-01), Zwerenz
patent: 4239393 (1980-12-01), Tobias
patent: 4303914 (1981-12-01), Page
Schneck Thomas
Trafton David L.
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