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Combination light unit and battery monitor device

  • US 5,105,180 A
  • Filed: 02/12/1990
  • Issued: 04/14/1992
  • Est. Priority Date: 02/12/1990
  • Status: Expired due to Fees
First Claim
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1. A combination light unit and battery monitor device for use with a video camera or the like and operable by a type of battery having certain no-load output voltage and charge characteristics such that when starting at a fully charged condition and then operating with a load resistance value within a certain range its output voltage is gradually reduced to reach when in a safely discharged condition a certain safe voltage level which is a function of said load resistance value, said device comprising:

  • a pair of input terminal means for interconnection to a pair of terminals of said battery, light means for illumination of objects in a field of view of said camera, connecting means between said light means and said input terminal means for connecting said light means in parallel with said battery for energization therefrom, and battery charge condition indication means connected in parallel relation to said light means for monitoring the battery voltage applied from said battery to said light means, said device having first and second modes of operation, said light means including at least two light means and being arranged to operate in said first mode to provide a low level of illumination and a first predetermined value of load resistance and in said second mode to provide a higher level of illumination and a second predetermined value of load resistance lower that said first predetermined value of load resistance, said battery charge condition indicating means being arranged to operate in said first mode to indicate when the voltage across said light means has dropped below a certain voltage which is equal to said safe voltage level as determined by said first predetermined value of load resistance and in said second mode to again indicate when the voltage across said light means has dropped below a second certain voltage equal to said safe voltage level as determined by said second predetermined value of load resistance, to provide an indication of an approach of said safely discharged condition of said battery.

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