Lighting control circuit for vehicle brake light/tail light/indicator light assembly
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1. A control circuit for vehicle indicator lamps, comprising:
- a first XOR gate having a first input responsive to a left-turn signal, a second XOR gate having a first input responsive to a right-turn signal, said first and second XOR gate each having a second input responsive to a brake signal, and a third XOR gate having a first input responsive to a tail light signal;
an oscillator circuit responsive to an output of said third XOR gate;
a first NOR gate having a first input responsive to an output of said first XOR gate, a second NOR gate having a first input responsive to an output of said second XOR gate, said first and second NOR gates each having a second input responsive to an output of said oscillator circuit; and
a first transistor responsive to an output of said first NOR gate, and a second transistor responsive to an output of said second NOR gate;
wherein an output of said first transistor provides electrical current to a first vehicle indicator lamp, and an output of said second transistor provides electrical current to a second vehicle indicator lamp.
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Abstract
According to the present invention, a lighting control circuit is provided in which various logic gates, transistors and other smaller-scale circuit elements are combined. The circuit receives as inputs the control signals from the vehicle, including the left and right indicator signals, the brake signal and the tail light signal. Each of these signals is fed into a first bank of logic gates whose outputs are supplied to a second bank of logic gates, whose output is in turn supplied to two transistors, each connected to a separate single filament bulb, one for the left side of the vehicle and the other for the right side.
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Citations
13 Claims
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1. A control circuit for vehicle indicator lamps, comprising:
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a first XOR gate having a first input responsive to a left-turn signal, a second XOR gate having a first input responsive to a right-turn signal, said first and second XOR gate each having a second input responsive to a brake signal, and a third XOR gate having a first input responsive to a tail light signal; an oscillator circuit responsive to an output of said third XOR gate; a first NOR gate having a first input responsive to an output of said first XOR gate, a second NOR gate having a first input responsive to an output of said second XOR gate, said first and second NOR gates each having a second input responsive to an output of said oscillator circuit; and a first transistor responsive to an output of said first NOR gate, and a second transistor responsive to an output of said second NOR gate;
wherein an output of said first transistor provides electrical current to a first vehicle indicator lamp, and an output of said second transistor provides electrical current to a second vehicle indicator lamp. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A lighting control circuit for a vehicle comprising:
- means for accepting control signals from the vehicle, including turn indicator signal, braking signal and tail light signal; and
producing at least one output signal, said output signal for providing electric current to a vehicle indicator lamp;
wherein a tail light signal alone produces a half current output signal;
a braking signal without a turn indicator signal produces a full current output signal;
a turn indicator signal without a tail light signal produces an alternating full current/no current output signal; and
a turn indicator signal with a tail light signal produces an alternating full current/half current output signal. - View Dependent Claims (10, 11, 12)
- means for accepting control signals from the vehicle, including turn indicator signal, braking signal and tail light signal; and
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13. A lighting control circuit for a vehicle comprising:
- logic gates and transistors;
control signals from the vehicle, including left and right indicator signals, a brake signal and a tail light signal, each of said indicator signals, brake signal and tail light signal is fed into a first bank of said logic gates whose outputs are connected to a second bank of said logic gates, whose outputs are in turn supplied to two of said transistors, each connected to a separate bulb, one for the left side of the vehicle and the other for the right side of the vehicle.
- logic gates and transistors;
Specification