TWICE ROTATED Y-CUT CRYSTAL VIBRATOR AND OSCILLATOR USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a twice rotated Y-cut crystal vibrator that can have an ideal frequency temperature characteristic which is flat in an area of temperature higher than room temperature even with a small-sized crystal substrate in a finite shape. SOLUTION: The crystal vibrator is constituted by using a crystal substrate cut to have as a main surface a surface obtained by rotating a plane containing axes X and Z of crystal having orthogonal coordinate axes X, Y and Z as crystal axes around the axis Z by an angle (ϕ1) within a range from a 70°reference angle to 14°40' and rotating the plane around a new coordinate axis X' to an AT plate side by a certain angle (ϕ2) within a range from a 34°00' reference angle to <35°10' (except 35°10'). COPYRIGHT: (C)2004,JPO