Patent ID: 6087758
Filing Date: 2000-07-11
Classification: H03H

Abstract:
A piezoelectric vibration device, comprising:a piezoelectric substrate having an upper major surface and a lower major surface;at least two resonance sections each including a first resonance electrode and a second resonance electrode provided on the upper major surface of the piezoelectric substrate with a gap therebetween and a common electrode provided on the lower major surface of the piezoelectric substrate and opposed to the first and second resonance electrodes such that the piezoelectric substrate is located therebetween;a slit provided between the at least two resonance sections and extending from one side of the piezoelectric substrate to a central portion of the piezoelectric substrate along a first direction; andL.sub.1 -g/2<a.ltoreq.(3/4)L being satisfied where a is the length of the slit, g is the gap width between the first and the second resonance electrodes along an opposing direction thereof, L.sub.1 is the distance from a center of the gap to a nearest side among the sides of the piezoelectric substrate and sides of the slit, and L is the external dimension of the piezoelectric substrate along the first direction.