Ambient light sensing method and apparatus

Details Ambient light sensing method and apparatus Ambient light sensing method and apparatus

1988-10-25

1991-03-26

Wieder, Kenneth

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340468, B60Q 100

Patent

active

050032887

ABSTRACT:
A telltale for sensing and responding to ambient light levels. A photosensor monitors light levels and causes a bulb or other controlled element to be energized if ambient levels reach a threshold. In one embodiment a time delay is instituted between sensing the threshold light level and bulb energization. This prevents false triggering on transitory conditions. An additional embodiment has a threshold level that uses hysteresis to avoid unstable sensing near the threshold level. A preferred use for the telltale is in apprising a motor vehicle operator when to turn on the vehicle headlamps.

REFERENCES:
patent: 3662334 (1972-05-01), Susslin
patent: 4125824 (1978-11-01), McPherson et al.
Martin, "A Warning Device for Switching on the Lights of a Vehicle", Rev. Espanola Electronica (Spain) vol. 24, No. 272 (07.1977) pp. 46-47.
Wagstaff, "Dual Purpose Lights Reminder for Cars Reminds You to Turn Your Lights on Reminds You to Turn Your Lights Off", Practical Elect. vol. 15, No. 3 (03-1979) pp. 62-64.

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