Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Reexamination Certificate
2005-05-24
2005-05-24
Luu, Thanh X. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
C136S246000
Reexamination Certificate
active
06897423
ABSTRACT:
An autonomous light tracking device includes first and second movable light-sensitive sensors that produce respective first and second electrical signals representative of light received from a remote light source, and a first comparator that receives the first and second electrical signals and is adapted to provide a first output signal when the first electrical signal differs substantially from the second electrical signal in a predetermined manner. The autonomous light tracking device also includes a motor 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 arcuate range of motion, and a power supply for the first comparator and the motor, that generates required electrical power from the remote light source.
REFERENCES:
patent: 4469938 (1984-09-01), Cohen
patent: 4883340 (1989-11-01), Dominguez
patent: 5317145 (1994-05-01), Corio
patent: 5493824 (1996-02-01), Webster et al.
patent: 6367259 (2002-04-01), Timm
Rader Dennis
Redler Michael H.
Luu Thanh X.
Redler Michael H.
Wolf Greenfield & Sacks P.C.
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