Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Reexamination Certificate
2006-07-11
2006-07-11
Luu, Thanh X. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
C372S034000, C372S038010
Reexamination Certificate
active
07075047
ABSTRACT:
A temperature control apparatus comprises a light-emitting device, a light-emitting device controller, a Peltier device for controlling the temperature of the light-emitting device to a target temperature, a temperature detector for the light-emitting device, a first reference voltage holding unit for holding a voltage corresponding to the target temperature, a reference voltage controller for outputting a holding signal and a switching signal, a second reference voltage holding unit for holding the output voltage of the temperature detector on the basis of the holding signal, a reference voltage switching unit for selecting either the output of the first reference voltage holding unit or the output of the second reference voltage holding unit as a reference voltage, and a Peltier controller for controlling the Peltier device so as to minimize a difference between the output voltage of the temperature detector and the output voltage of the reference voltage switching unit.
REFERENCES:
patent: 5499258 (1996-03-01), Kawano et al.
patent: 6229833 (2001-05-01), Noda et al.
patent: 07022678 (1995-01-01), None
patent: 7-321392 (1995-12-01), None
Aoki Toru
Noguchi Nobuaki
Okazaki Makoto
Ueda Yasushi
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