Patent ID: 7905149

Claim:
A physical sensor comprising: a supporting substrate; an element substrate that includes a sensor element and is joined to the supporting substrate through an insulating layer; a glass cap that covers an area of the sensor element and is joined to the element substrate; and a built-in electrode that is electrically connected to the sensor element; wherein, the built-in electrode is formed in a through hole passing through the element substrate, the insulating layer and the supporting substrate; a portion of the glass cap that covers the area of the built-in electrode is anodically bonded to the element substrate; the element substrate includes a frame forming the periphery thereof and the sensor element formed inside the frame, and the sensor element is arranged in a hermetic seal portion surrounded by the frame, the insulating layer, the supporting substrate and the glass cap; the element substrate including the frame and the sensor element is formed of silicon with a low resistance, an electrode portion of the sensor element is formed of an island-shaped electrode portion insulated with the insulating layer and the glass cap, and the built-in electrode is formed to electrically conduct in the through hole of the island-shaped electrode portion and formed through an insulating film in the through hole of the supporting substrate corresponding to the through hole of the island-shaped electrode portion; and the through hole of the island-shaped electrode portion is smaller in diameter than the through hole of the supporting substrate corresponding to the through hole of the island-shaped electrode portion.