Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Reexamination Certificate
2008-09-17
2010-02-09
Sohn, Seung C (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
C347S236000
Reexamination Certificate
active
07659496
ABSTRACT:
A light emitting device includes at least one light emitting unit, a switching unit, a comparator unit, a charge storage unit and a sensing unit. The switching unit is electrically connected to the light emitting unit. The comparator unit is electrically connected to the switching unit. The charge storage unit is electrically connected to the comparator unit and stores an amount of electric charges. The sensing unit has a light sensing circuit and is electrically connected to the charge storage unit. The light sensing circuit senses a light intensity of the light emitting unit. The sensing unit adjusts the amount of the electric charges and a voltage corresponding to the amount of the electric charges according to the light intensity. The comparator unit compares the voltage with a threshold voltage. The switching unit controls the light emitting unit in accordance with the result of the comparison.
REFERENCES:
patent: 5710589 (1998-01-01), Genovese
patent: 6350978 (2002-02-01), Kasai
patent: 6560256 (2003-05-01), Seki et al.
patent: 7190454 (2007-03-01), Hsu et al.
patent: 2007/0159422 (2007-07-01), Blandino et al.
Aussmak Optoelectronic Corp.
Birch & Stewart Kolasch & Birch, LLP
Sohn Seung C
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