Ambient light sensing method and apparatus

  • US 5,003,288 A
  • Filed: 10/25/1988
  • Issued: 03/26/1991
  • Est. Priority Date: 10/25/1988
  • Status: Expired due to Term
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First Claim
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1. Sensing apparatus for use in a motor vehicle comprising:

  • energization means for providing an energization signal;

    sensor means for monitoring an ambient light level and producing a sensed signal related to said ambient light level;

    a timer coupled to the sensor means for generating an indicating output in response to a sensed signal corresponding to a threshold ambient light level; and

    a light source energized by the energization signal and coupled to the timer to respond to the indicating output if the ambient light level sensed by the sensor means reaches the threshold ambient light level;

    said timer responsive to said sensor means to energize said light source for a first time period and then de-energize said light source to allow the sensor means to sense ambient light levels without interference from the light output from the source.

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