Patent ID: 6880407
Filing Date: 2005-04-19
Classification: G01G

Abstract:
1. A load sensor with use of a crystal resonator comprising: a long plate-shaped crystal resonator; supporting bodies for respectively supporting both lengthwise end portions of the crystal resonator; and exciting means for exciting a thickness shear oscillation at a center portion of the crystal resonator in the length direction; wherein middle portions whose thickness is smaller than that of the center portion and both of the end portions are respectively provided between the center portion and both of the end portions; wherein each of the supporting bodies is shaped to allow a respective one of the end portions and at least a part of a respective one of the middle portions to be fitted to the supporting body, each of the supporting bodies being configured to support a respective end portion with the respective end portion and part of one of the middle portions fitted to the supporting body; and wherein a load is measured based on change in an oscillation frequency of the thickness shear oscillation of the center portion of the crystal resonator generated in proportion to the load acted thereon through the supporting bodies.