Patent ID: 7900464

Claim:
A humidity detecting apparatus, comprising: a humidity sensor for detecting a relative humidity of air on an interior side of a window glass; an air temperature sensor for detecting a temperature of the air; a glass temperature sensor for detecting a temperature of the window glass; a glass surface relative humidity calculation unit for calculating a relative humidity of an inner surface of the window glass based on output values of the humidity sensor, the air temperature sensor and the glass temperature sensor; a circuit board electrically connected to the glass temperature sensor; a first heat conductive member disposed between the window glass and the glass temperature sensor; a metallic member having heat conductivity disposed between the circuit board and the window glass; and a second heat conductive member, wherein the first heat conductive member is disposed between the metallic member and the window glass and the second heat conductive member is disposed between the metallic member and the circuit board, and the glass temperature sensor is at least partially embedded in the second heat conductive member.