Humidity measuring apparatus and image forming apparatus

Details Humidity measuring apparatus and image forming apparatus Humidity measuring apparatus and image forming apparatus

2007-02-06

2009-10-06

Williams, Hezron (Department: 2856)

Measuring and testing

Gas analysis

Moisture content or vapor pressure

Reexamination Certificate

active

07597001

ABSTRACT:
A humidity measuring apparatus including: a humidity detecting element whose resistance value changes according to a humidity change; a resistor serially connected to the humidity detecting element; a signal output unit which outputs a clock signal to the humidity detecting element and the resistor; and a measuring unit which detects a voltage of a connecting point of the humidity detecting element and the resistor at predetermined timing from an edge of the clock signal and obtains a humidity based on the detected voltage, wherein an abnormality of the humidity detecting element is detected by detecting the voltage at timing different from the predetermined timing based on the voltage detected by the measuring unit.

REFERENCES:
patent: 5065625 (1991-11-01), Nakagawa et al.
patent: 5381954 (1995-01-01), Tokizaki
patent: 5585559 (1996-12-01), Hata
patent: 6029021 (2000-02-01), Nishimura et al.
patent: 6173134 (2001-01-01), Nishimura et al.
patent: 02-298848 (1990-12-01), None
patent: 07-311169 (1995-11-01), None

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