Patent ID: 8415622

Claim:
An infrared imaging element comprising: a semiconductor substrate comprising a stacked structure of a silicon first substrate, a first insulation film, and a silicon layer stacked in the cited order, a plurality of first cavities being provided on a surface of the first substrate on a side of the first insulation film; an infrared detection unit provided in the semiconductor substrate to detect incident infrared rays, the infrared detection unit including, a plurality of detection cells provided respectively over the plurality of first cavities to detect the incident infrared rays, each of the detection cells having diodes provided in the silicon layer and a second insulation film which covers the diodes, the first insulation film on the first cavity absorbing the incident infrared rays and converting the incident infrared rays to heat, the diodes converting the heat obtained by the first insulation film to an electric signal, a first support structure unit provided to correspond to each of the detection cells to support the detection cell over the first cavity corresponding thereto, the first support structure unit having a first connection wiring connected to a selection line to select the detection cell corresponding thereto, and a second support structure unit provided to correspond to each of the detection cells to support the detection cell over the first cavity corresponding thereto, the second support structure unit having a second connection wiring connected to a signal line to transfer an electric signal from the detection cell corresponding thereto; a circuit unit provided in an area of the semiconductor substrate which differs from an area where the infrared detection unit is formed, the circuit unit including a drive circuit which drives the selection line, a signal processing circuit which process the electric signal sent via the signal line, and a third insulation film covering the drive circuit and the signal processing circuit and having a top face located at a greater distance from the semiconductor substrate as compared with a top face of the second insulation film; a second substrate provided over the third insulation film to cover the infrared detection unit; and a reflection film provided on a face of the second substrate opposed to the infrared detection unit, wherein a second cavity is formed between the second substrate and the infrared detection unit, and with respect to each detection cell, the first substrate located right under the first cavity functions as a transmission window of the incident infrared rays.