Vehicular conspicuity lamp with rapidly modulated intensity

Details Vehicular conspicuity lamp with rapidly modulated intensity Vehicular conspicuity lamp with rapidly modulated intensity

2011-04-19

2011-04-19

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Special application

Vehicle

C315S082000, C315S291000

Reexamination Certificate

active

07928660

ABSTRACT:
A method and apparatus is used to rapidly modulate the intensity of a vehicular lamp for the purpose of enhancing the vehicle's conspicuity. A timer is used to generate a periodically varying pulse width modulated signal that is used to drive a transistor connected to one or more lamps. The modulation rate is chosen such that the lamp or lamps appear to flicker when seen with peripheral vision, yet appears not to flicker when seen out of the center of the eye.

REFERENCES:
patent: 4578591 (1986-03-01), Floyd et al.
patent: 4841198 (1989-06-01), Wilhelm
patent: 5001398 (1991-03-01), Dunn
patent: 5334914 (1994-08-01), Dean et al.
patent: 6369513 (2002-04-01), Kanazawa
patent: 2003/0107357 (2003-06-01), Uchikura et al.
patent: 2005/0258781 (2005-11-01), Funae et al.
patent: 2008/0122607 (2008-05-01), Bradley

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