Patent ID: 6897423
Filing Date: 2005-05-24
Classification: F24S,G01J,G01S,Y02E

Abstract:
1. An autonomous light tracking device comprising: a first, movable light-sensitive sensor that produces a first electrical signal representative of light received from a remote light source; a second, movable light-sensitive sensor that produces a second electrical signal representative of light received from the remote light source; a first comparator that receives the first and second electrical signals and adapted to provide a first output signal when the first electrical signal differs substantially from the second electrical signal in a predetermined manner; a prime mover coupled to the first and second movable light-sensitive sensors, that selectively moves the first and second movable light-sensitive sensors in response to the first output signal so as to maintain the first and second movable light-sensitive sensors in approximate relative alignment with the remote light source over a substantial angular range of motion; and a power supply for the first comparator and the prime mover, that generates required electrical power for the prime mover from the remote light source by storing energy received from at least one photovoltaic cell and providing power to the prime mover only when a predetermined amount of energy has been stored, such that the prime mover exhibits intermittent motion.