초록 ▼

A resonator including a piezoelectric element; a lead terminal comprised of an electroconductive wire material formed by press working with a tapered receiving groove for holding an end of the piezoelectric element at its top end; and a capacitor connected to the outer circumference of the top end o

A resonator including a piezoelectric element; a lead terminal comprised of an electroconductive wire material formed by press working with a tapered receiving groove for holding an end of the piezoelectric element at its top end; and a capacitor connected to the outer circumference of the top end of the lead terminal in a state with the end of the piezoelectric element held in the receiving groove of the lead terminal so as to constitute a resonance circuit together with the piezoelectric element. Preferably, a difference of a coefficient of heat expansion of a piezoelectric ceramic constituting the piezoelectric element and a coefficient of heat expansion of a dielectric ceramic constituting the capacitor is not more than 5 ppm/.degree. C. Preferably, the area of the surface of the piezoelectric element contacting a vibrating space is in a predetermined relation with the frequency band of the piezoelectric element.

대표청구항 ▼

[What is claimed is:] [1.]a piezoelectric element;a lead terminal comprised of an electro-conductive wire material formed by press working with a tapered V shaped or trapezoidal receiving groove for holding an end of the piezoelectric element, the cross-sectional shape of the wire material constitut

[What is claimed is:] [1.]a piezoelectric element;a lead terminal comprised of an electro-conductive wire material formed by press working with a tapered V shaped or trapezoidal receiving groove for holding an end of the piezoelectric element, the cross-sectional shape of the wire material constituting the lead terminal being substantially circular at the portion not formned with the tapered V shaped or trapezoidal receiving groove and the tapered V shaped or trapezoidal receiving groove having an open portion, with a cross section wider than the thickness of the end of the piezoelectric element, and a pair of inclined straight line side walls extending from a top of the groove to a bottom of the groove; anda capacitor connected to the outer circumference of the top end of the lead terminal in a state with the end of the piezoelectric element held in the receiving groove of the lead terminal so as to constitute a resonance circuit together with the piezoelectric element.