Humidity measuring apparatus and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorMasahiro Hayakawa
Life of this patent
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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.
Claims10
A humidity measuring apparatus comprising:
- 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 at a connecting point of the humidity detecting element and the resistor at a predetermined timing from one of a leading edge and a trailing edge of the clock signal so as to determine a humidity, and which detects a voltage at the connecting point at a timing different from the predetermined timing so as to determine an abnormality of the humidity detecting element.
An image forming apparatus comprising:
- an image forming unit which forms an image;
- a humidity detecting apparatus having a humidity detecting element whose resistance value changes according to a humidity change and 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;
- a control unit which controls an image forming condition of the image forming unit based on an output from the humidity detecting apparatus,
- a measuring unit which detects a voltage at a connecting point of the humidity detecting element and the resistor at predetermined timing from one of a leading edge and a trailing edge of the clock signal so as to determine a humidity, and which detects a voltage at the connecting point at timing different from the predetermined timing so as to determine the abnormality of the humidity detecting element.
Dependencies are inferred from the claim text.