Signals and indicators – Navigation devices
Patent
1974-12-31
1976-10-19
Griffin, Robert L.
Signals and indicators
Navigation devices
1161241R, 334 36, H04B 106
Patent
active
039874010
ABSTRACT:
An indicating system for a radio receiver is formed of an indicator and associated control circuitry. The indicator is comprised of two emitting diodes wired in parallel and in reverse polarity, and encapsulated in a translucent package. Each diode in an indicator emits light of a visibly distinct wavelength when energized. The control circuitry causes a change in polarity of bias voltage applied to the indicator, and, in so doing a change in color of the indicator. With appropriate control circuitry, the color of the indicator indicates whether the receiver is tuned to an AM or FM station, or whether the station is broadcasting in mono or stereo. The indicator can be mounted to the dial pointer causing a change in pointer color with a change in receiver function. Additionally, the amount of current through the light emitting diodes and thus the intensity of emitted light may be varied in accordance with a parameter variation as, for example, accuracy of receiver tuning.
REFERENCES:
patent: 2019882 (1935-11-01), West
patent: 2120136 (1938-06-01), Lyman
patent: 2528214 (1950-10-01), Dome
patent: 3319004 (1967-05-01), Avins
patent: 3388220 (1968-06-01), Houshi
patent: 3530501 (1970-09-01), Von Benschoten
patent: 3594776 (1971-07-01), Wildgruber
patent: 3732498 (1973-05-01), Beckman et al.
patent: 3840873 (1974-10-01), Usui
patent: 3873979 (1975-03-01), Craford et al.
patent: 3882399 (1975-05-01), Karpowycz et al.
Gillman James W.
Griffin Robert L.
Lisa Donald J.
Motorola Inc.
Ng Jin F.
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