Communications: electrical – Systems – Periodic or flashing
Patent
1995-02-16
1996-10-15
Hofsass, Jeffery
Communications: electrical
Systems
Periodic or flashing
362800, 362 833, 362108, 340321, G08B 500
Patent
active
055658393
ABSTRACT:
A preferred form of a battery-powered, portable flashing superluminescent light-emitting diode safety warning light 10 is described having a single SLD 40 mounted at a shallow angle of between 3 and 22 degrees on a reflective printed circuit board 54. The SLD 40 has a narrow optical band width that is directed to a thin right angle lens 24 that is mounted in a curved condition between sidewalls 16 and 18. The lens 24 has a smooth outer surface 62 and a grooved inner surface 64. The inner surface 64 has parallel "V" shaped grooves formed therein that form linear prisms 76 that extend in a curved contour between the sidewalls 16 and 18. The light 10 has a battery-powered electrical circuit 50 for pulsing the SLD 40 at a frequency of between 1 and 3 Hz and with a pulse width of between 10 and 50 percent of the frequency period. The electrical circuit 50 utilizes a NPN transistor 98 that is mounted backwards for turning the SLD 40 OFF and ON during the duty cycle. Voltage on a capacitor 106 provides a forward bias on a base-emitter junction of the NPN transistor 98 to turn the transistor 98 ON and discontinues the forward bias to turn the NPN transistor 98 OFF.
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Grafon Corporartion
Hofsass Jeffery
Pope Daryl C.
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