| 摘要 |
PURPOSE:To facilitate the yield of internal strain by external force and to make pressure sensitivity excellent, by forming a piezoelectric plate, in which vibration in a thickness system is excited, in a turning fork shape comprising two tuning fork arms, and forming a pair of electrodes on both main surfaces of a base part. CONSTITUTION:It is assumed that a tuning-fork shaped crystal piece 6, which is to become a piezoelectric conversion element, is placed with a space provided. External force is applied on both side surfaces of tuning fork arms 8a and 8b, i.e., on Y'-Z plane, in the direction of an arrow Q. The two tuning fork arms 8a and 8b are mechanically deformed inward with the extended parts as centers. Contracting force q1, whose direction is the same as that of the external force Q, acts on the upper end part of a base part 7. Expanding force q2, whose direction is opposite to that of the external force, acts on the lower end part of the base part 7. Therefore strains are yielded in the opposite directions along the X axis at the upper and lower end parts of the base part 7. Said strains are yielded in direct response to the mechanical displacements of the tuning fork arms 8a and 8b. Therefore the quantity of the strain becomes large. |
