Method and circuitry for producing dynamic illumination of disch

Details Method and circuitry for producing dynamic illumination of disch Method and circuitry for producing dynamic illumination of disch

1994-03-23

1995-09-26

Pascal, Robert J.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315246, 315224, 315219, H05B 3702

Patent

active

054536685

ABSTRACT:
A sweeping signal generator generates sequences of logic-level pulses of variable pulse-width. The logic-level pulses are amplified and applied to the electrodes of a discharge lamp. The illumination region of the discharge lamp is dynamically varied in size by dynamically varying the widths of the pulses, thereby producing sweeping effects and other display effects. In the preferred embodiment the sweeping signal generator comprises a microprocessor, a counter and a tri-state buffer. The microprocessor periodically loads the counter with an initial count value to initiate a pulse at the output of the tri-state buffer. The value loaded into the counter controls the duration of the pulse. Pulses are then amplified using a circuit which comprises a switching transistor, a power source, and a step-up transformer.

REFERENCES:
patent: 4645979 (1987-02-01), Chow
patent: 4719389 (1988-01-01), Miesterfeld
patent: 4742278 (1988-05-01), Iannini
patent: 4933612 (1990-06-01), Bonin

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