Patent ID: 7998556

Claim:
An element structure comprising: an operational portion substrate having an operational portion in a region other than an outer region of the substrate; a polyimide layer disposed on a front surface of the operational portion substrate, the polyimide layer having a recess in a region opposing the operational portion, the recess defining a space between the operational portion and the polyimide layer; a cover substrate combined with the operational portion substrate with the polyimide layer therebetween, wherein the recess has an internal side wall rising perpendicularly or substantially perpendicularly to the front surface of the operational portion substrate and a smooth flat internal bottom surface opposing the front surface of the operational portion substrate with a constant distance therebetween, and wherein the polyimide layer includes an operational portion substrate side surface, the polyimide layer having a uniform thickness disposed in a cured state on the surface of a portion of the operational portion substrate surrounding the operational portion; and a cover substrate side polyimide layer having a uniform thickness disposed in a cured state over the entirety of the operational portion substrate side surface of the polyimide layer, and the operational portion substrate side surface of the polyimide layer and the cover substrate side polyimide layer are joined together.