Patent ID: 7114848

Claim:
An environment sensor comprising: a temperature sensor which measures a temperature; and a humidity sensor which measures a humidity, wherein said temperature sensor and humidity sensor are formed on the same substrate as a pair of stacked bodies having a multilayered structure including a lower electrode, a metal oxide layer formed on the lower electrode, and an upper electrode formed on the metal oxide layer, the lower electrode of said temperature sensor and the lower electrode of said humidity sensor are common, and the upper electrode of said temperature sensor and the upper electrode of said humidity sensor are common, of at least the upper electrode of the stacked bodies which faces a measurement ambient, the upper electrode of said temperature sensor covers a whole upper surface of the metal oxide layer, and the upper electrode of said humidity sensor partially covers the metal oxide layer, said humidity sensor measures the humidity by using a change in capacitance or electrical resistance between the electrodes, which is caused by water adsorbed by the metal oxide layer, the metal oxide layer covered by the upper electrode of said humidity sensor is formed by polycrystal structure, and the area of the metal oxide layer covered by the upper electrode of said humidity sensor is 50% or less of whole area of the metal oxide layer.