Liquid crystal lens driver electronics for eye protection, high speed shuttering with consistent performance

  • US 5,751,258 A
  • Filed: 09/04/1996
  • Issued: 05/12/1998
  • Est. Priority Date: 03/25/1991
  • Status: Expired due to Term
First Claim
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1. A portable power supply for a protective optical lens system that has at least relatively greater and lesser light transmission characteristics, comprisinga regulated power supply for supplying substantially regulated power for driving such lens system from an unregulated power source,said regulated power supply comprising a regulated voltage reference, a DC to DC oscillator, a voltage power input, and inductor and capacitor circuit with diode isolation to develop and to store in said capacitor a voltage of a magnitude greater than the voltage of said voltage power input, a switch for switching a connection between said inductor and capacitor, said oscillator being coupled to operate said switch to open and close state to accumulate charge and voltage in said capacitor, and a comparator circuit for comparing the voltage of said capacitor with said regulated voltage reference to control operation of said oscillator to develop a voltage in said capacitor in proportional relation to a comparison between said regulated voltage reference and the voltage in said capacitor,output circuit means for coupling power from said regulated power supply to such lens system to cause such lens system to achieve greater and lesser light transmission characteristics.

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