| 摘要 |
PURPOSE:To obtain a high coupling piezoelectric oscillator which is free from the spurious of frequency characteristics as well as the deterioration of a mechanical quality coefficient, by selecting ratio between the length in the longitudinal direction of a main surface of an oscillating element and the thickness in the direction of an axis X at a value larger than a specific degree. CONSTITUTION:A rectangular oscillating element 1 is made of a single crystal X plate of LiTaO3 with a rectangular section secured for its longer side that is defined in a 50 deg.+ or -2 deg. clockwise direction from an axis Y and within a plane X of the crystal. Then electrodes 2 and 2' are formed over the entire width of the counter surfaces which are parallel to the plane X of the element 1. In this case, L/H is set at >=14, where L is the length of a main surface in the longer side of the element 1, W is a main surface rectangular to the longitudinal direction of the element 1 and H is the thickness in the direction of the axis X. |
