Patent ID: 7357026

Claim:
An acceleration sensor having a laminated substrate including a first layer and a second layer disposed on the first layer, comprising: a base portion constituting a portion of the first layer and a portion of the second layer, the base portion having an upper and a lower surface, an opening being defined inside the base portion, the opening extending from the upper surface to the lower surface; a weight portion constituting a portion of the first layer and disposed away from the base portion and within the opening; flexible beam portions constituting a portion of the first layer and connected to an upper portion of the base portion and an upper portion of the weight portion; and stopper portions constituting a portion of the second layer and protruding from the base portion toward the opening, each of the stopper portions being disposed above and away from the first layer of the weight portion and restricting an amount of displacement of the weight portion in the direction of each of the stopper portions, wherein a thickness of each of the flexible beam portions is smaller than a thickness of each of the stopper portions.