Patent
Battery-powered flashing superluminescent light emitting diode safety warning light
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TLDR
In this article, a superluminescent light-emitting diode light source (SLD1-SLDn) is driven by a power driver (PD) supplied by a high frequency oscillator (HFO) with an oscillatory drive signal at a visually imperceptible but highly efficient operating frequency, the oscillatory driver signal preferably being a pulse signal of 1 to 5 KHz, to cause the light source to be illuminated and extinguished at the oscillator drive signal frequency, such that extinction of a light source is not visually perceptible.Abstract:
A device includes a flashing safety warning light in which a superluminescent light-emitting diode light source (SLD1-SLDn) is driven by power driver (PD) supplied by a high frequency oscillator (HFO) with 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 light source to be illuminated and extinguished at the oscillatory drive signal frequency, such that extinction of the light source is not visually perceptible. The oscillatory drive signal is in turn gated on and off in accordance with a gating signal from a low frequency oscillator (LFO) 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 light source to be visually perceived as flashing on and off at the gating signal frequency in an attention-attracting manner.read more
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References
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Patent
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John H. Morse,Robert Skrynecki +1 more
TL;DR: A flexible safety belt which may be easily worn about the waist of a pedestrian or runner is disclosed in this paper, which includes an arrangement for fastening the ends together and a plurality of light-emitting diodes disposed along the outer surface of the belt.