Vehicle mounted light activated control system

  • US 4,249,160 A
  • Filed: 05/26/1978
  • Issued: 02/03/1981
  • Est. Priority Date: 11/21/1975
  • Status: Expired due to Term
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First Claim
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1. A light activated control system comprising:

  • a comparator circuit having first and second inputs;

    photoelectric ambient light sensing means;

    means connecting the sensing means to the first comparator input to provide a signal voltage level at said input representative of the instantaneous output of the sensing means;

    capacitive means connected to the second comparator input and to the sensing means for averaging continuously the output of the sensing means to provide at said second input a continuously varying reference voltage level;

    triggering means connected to the output of the comparator circuit, andwarning means connected to the triggering means and controlled by the comparator means through the triggering means, whereby the warning means are triggered into operation by the triggering means when the light intensity at the sensing means increases at a rate such that the said signal voltage level exceeds the said reference voltage level, to cause operation of the warning means.

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