Patent ID: 6707234
Filing Date: 2004-03-16
Classification: H03H

Abstract:
A quartz crystal unit comprising a width-extensional mode quartz crystal resonator capable of vibrating in a width-extensional mode, a case and a lid, wherein said resonator comprises:a vibrational portion having a length greater than a width and a thickness smaller than the width; connecting portions located at ends of said vibrational portion; supporting portions connected to said vibrational portion through said connecting portions; and electrodes disposed opposite each other on upper and lower faces of said vibrational portion, and wherein a cutting angle of said resonator is expressed by either of XZtw(&thgr;x)/(&thgr;y) and XZwt(&thgr;y)(&thgr;x) and the &thgr;x and &thgr;y are within a range of âˆ’25Â° to +25Â° and âˆ’30Â° to +30Â°, respectively.