AT-Cut quartz resonator, with w/t=2.0 to 2.8, l/t<25
AssigneeKabushiki Kaisha Daini Seikosha
InventorsShunichi Motte, Naoyuki Echigo, Shiro Yamashita, Tsuneo Kuwabara, Kunihiro Takahashi
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Abstract
An AT-cut quartz resonator is disclosed, wherein the length l, the width w and the thickness t of the quartz crystal plate are respectively chosen in the directions of an electrical axis (X-axis), an optical axis (Z'-axis) and a mechanical axis (Y'-axis), the width-to-thickness ratio w/t is chosen in the range of 2.0 to 2.8 and the length-to-thickness ratio l/t is chosen less than 25. Consequently, an AT-cut quartz resonator of miniature size having high Q-values of the major mode and excellent frequency-temperature characteristics of the vibration frequency is realized.
Claims9
A quartz resonator comprising:
- an AT-cut quartz crystal plate rotated counter-clockwise around the X-axis of the quartz crystal plate by a cut angle .theta. having a value from about 33.degree.20' to about 36.degree.20', having an overall length l, an overall width w and a maximum thickness t respectively extending along the X-axis, the Z'-axis and the Y'-axis of the quartz crystal plate, a width-to-thickness ratio w/t between about 2.0 to about 2.8 and a length-to-thickness ratio l/t less than about 25.
Dependencies are inferred from the claim text.