Electrophotography – Control of electrophotography process – Control of fixing
Reexamination Certificate
2007-10-23
2007-10-23
Gray, David M. (Department: 2852)
Electrophotography
Control of electrophotography process
Control of fixing
C399S069000, C399S070000
Reexamination Certificate
active
11167644
ABSTRACT:
In a temperature detector a smoother circuit receives a pulse signal generated by a pulse signal generation circuit to smooth the signal and transmit it to a first node. A comparator compares a level in voltage transmitted on the node with that in voltage on a second node connected to a thermistor element line and outputs a resultant comparison as a detection signal to a heater controller. The temperature detector can have on the first node a reference voltage adjustable by a duty ratio of the pulse signal output by the pulse signal generation circuit. A resistor or similar component can be dispensed with and simply by adjusting the pulse signal's duty ratio the reference voltage can be adjusted. Temperature can thus be detected with high precision.
REFERENCES:
patent: 4703886 (1987-11-01), Kirby
patent: 6959158 (2005-10-01), Ohta
patent: 7-55589 (1995-03-01), None
patent: 8-292107 (1996-11-01), None
European Search Report for European Application No. EP 05 01 3958 mailed on Sep. 19, 2005, 3 pages.
Patent Abstracts of Japan, Publication No. 07-055589, Publication Date: Mar. 3, 1995, 1 page.
Patent Abstracts of Japan, Publication No. 08-292107, Publication Date: Nov. 5, 1996, 1 page.
Blackshire David A
Gray David M.
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