Warning devices with oscillating light patterns
A warning device. In some embodiments, the warning device can include: a plurality of light sources forming an array; a plurality of reflectors, with at least one reflector being associated with each of the plurality of lights; and a plurality of lenses, with at least one lens being associated with each of the plurality of lights. In some examples, each of the plurality of reflectors and the plurality of lenses is tilted along a principal axis to collimate light and to direct the light from one of the plurality of lights to one of a plurality of far field light spots.
1. A warning device, comprising:
a plurality of light sources forming an array, each light source having an associated optical axis;
a plurality of reflectors, with at least one reflector being associated with each of the plurality of light sources; and
a plurality of lenses, with at least one lens being associated with each of the plurality of light sources, each lens defining a principal axis with one of the reflectors;
wherein the principal axis of one of the lenses and reflectors is tilted at a nonzero angle relative to the optical axis of the associated light source to collimate light and to direct the light from the associated light source to one of a plurality of far field light spots.
2. The warning device of claim 1 , further comprising a two-stage drive circuit for each of the plurality of light sources.
3. The warning device of claim 2 , wherein the two-stage drive circuit includes a switching power supply and an adjustable current-limited power switch.
4. The warning device of claim 1 , wherein, for each reflector, a first portion of the reflector extends, relative to the optical axis of the associated light source, further than a second portion of the reflector.
5. The warning device of claim 1 , wherein the principal axis is tilted at a non-zero angle relative to the optical axis of the associated light source in each of two perpendicular dimensions of a plane that is perpendicular to the optical axis.
6. The warning device of claim 1 , wherein each of the plurality of lenses is positioned outside an associated reflector.
7. A warning device, comprising:
at least one Light-Emitting Diode; and
a two-stage drive circuit for the Light-Emitting Diode, the two-stage drive circuit including a switching power supply and an adjustable current-limited power switch, the switching power supply being configured to provide an output voltage that is greater than a maximum forward voltage for the Light-Emitting Diode and less than 1 Volt greater than the maximum forward voltage, the adjustable current-limited power switch being configured to limit a current through the Light-Emitting Diode generated by the output voltage to a maximum current for the Light-Emitting Diode.
8. The warning device of claim 7 , wherein the switching power supply is configured to step down a direct current input voltage.
9. The warning device of claim 7 , wherein the switching power supply is configured to provide the output voltage at about 0.2 Volt greater than the maximum forward voltage for the Light-Emitting diode.