Battery-powered flashing superluminescent light emitting diode s

Details Battery-powered flashing superluminescent light emitting diode s Battery-powered flashing superluminescent light emitting diode s

1992-12-28

1994-05-17

Crosland, Donnie L.

Communications: electrical

Systems

Periodic or flashing

340321, 34081503, 340432, 340471, 340473, 3409081, 315200A, 362800, G08B 500, B60Q 700

Patent

active

053131886

ABSTRACT:
A flashing safety warning light in which a superluminescent light-emitting diode (SLD) light source is driven by an oscillatory drive signal at a visually imperceptible but highly efficient operating frequency, the oscillatory drive signal preferably being a pulse signal of 1 to 5 KHz to cause the SLD to be illuminated and extinguished at the oscillatory drive signal frequency, such that extinction of the SLD is not visually perceptible. The oscillatory drive signal is in turn gated on and off in accordance with a gating signal at a low, highly visually perceptible frequency in the range of 3 to 12 Hz with a pulse duty cycle of between 10 to 60% in order to cause the SLD to be visually perceived as flashing on and off at the gating signal frequency in an attention-getting manner. An implementation of the flashing safety warning light for use as a bicycle safety flasher is described, and offers enhanced warning visibility with extended battery life.

REFERENCES:
patent: 5175528 (1992-12-01), Choi et al.

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