Electric lamp and discharge devices: systems – With signal – indicator – or alarm – Plural signals – indicators – or alarms
Patent
1982-10-28
1984-11-20
Dixon, Harold
Electric lamp and discharge devices: systems
With signal, indicator, or alarm
Plural signals, indicators, or alarms
315134, 315147, 315322, H01J 160
Patent
active
044841051
ABSTRACT:
A circuit for selectively lighting one of a pair of light-emitting diodes (LEDs) arranged in a parallel, back-to-back, circuit configuration also known as an anti-parallel circuit configuration. One side of the configuration is connected with ground connecting means through a first photon-emitting device which device is optically coupled to a first photon-responsive device connected between the other side of the configuration and a current source. The other side of the configuration is also connected with a ground connecting means through a second photon-emitting device which device is optically coupled to a second photon-responsive device connected between the first side of the configuration and the current source. Shunting means having a resistance value larger than the value of the first or second photon-responsive device when either is conducting is connected in parallel across the first photon-responsive device such that when ground is connected to one side of the configuration current flows from the source of current through the shunting means and the first photon-emitting device causing the first photon-emitting device to emit photons which impinge on the first photon-responsive device driving it into conduction to bypass the shunting means thereby allowing sufficient current to flow through and ignite one of the pair of LEDs. Similarly, when ground is connected to the other side of the configuration current flows from the current source through the shunting means and the second photon-emitting device causing it to emit photons which impinge on the second photon-responsive device driving it into conduction to bypass the shunting means such that current flows through and ignites the other of the pair of LEDs. The circuit can also be used in a switching matrix.
REFERENCES:
patent: 2076987 (1937-04-01), Edwards
patent: 3191039 (1965-06-01), Gucwa
patent: 3733497 (1973-05-01), Warnod
patent: 4395660 (1983-07-01), Waszkiewicz
Kriete Richard J.
Orsini Rafael R.
Weinglass Leon
AT&T - Technologies, Inc.
Dixon Harold
Kip, Jr. R. F.
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