Patent ID: 7535096

Claim:
A glass substrate comprising: a glass substrate body that has a pair of main surfaces opposite to each other; a plurality of island-shaped silicon portions that are buried in the glass substrate such that at least portions thereof are exposed from the pair of main surfaces; and a silicon substrate bonded to the glass substrate and disposed on one main surface of the glass substrate body, wherein at least one of the island-shaped silicon portions comes in contact with a part of the silicon substrate and is electrically connected to the silicon substrate, wherein each of the island-shaped silicon portions extends from a first main surface of the glass substrate body to a second main surface of the glass substrate body through the glass substrate body, and wherein a major part of the glass substrate body have a thickness that substantially equals to a thickness of the island-shaped silicon portions from the first main surface to the second main surface; and wherein the island-shaped silicon portions have metal layers buried in a concave portion formed therein under at least one of the main surfaces of each of the island-shaped silicon portions, the metal layers having an exposed surface exposed from the at least one of the main surfaces, the metal layers being entirely surrounded by the corresponding island-shaped silicon portion except the exposed surface such that the metal layers do not have an interface with the glass substrate body.