Quartz crystal resonator and manufacturing method thereof
AssigneeDiodes Incorporated
InventorsPo-Yang Su, Yi-Sheng Chiang, Han-Yun Tsai, Ta-Jen Chou
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Abstract
A quartz crystal resonator including a quartz crystal obtained from a quartz bar is provided. The quartz crystal is cut from the quartz bar along a cutting plane in a coordinate system having an optic axis, an electrical axis and a mechanical axis perpendicular to each other. The cutting plane has a first angle of about 35° to about 36° from the optic axis and a second angle of about 14° to about 16° from the electrical axis. The quartz crystal has a vibration frequency deviation within a range from −30 parts per million (ppm) to about +30 ppm over a temperature range from about −50° C. to about 150° C. Methods for making the quartz crystal resonator are also provided.
Claims20
A quartz crystal resonator comprising:
- a quartz crystal obtained from a quartz bar, the quartz crystal being cut from the quartz bar along a cutting plane in a coordinate system having an optic axis, an electrical axis and a mechanical axis perpendicular to each other, and the cutting plane having a first angle of about 35° to about 36° from the optic axis, and a second angle of about 14° to about 16° from the electrical axis rotated around the optic axis.
A method of making a quartz crystal resonator, comprising:
- obtaining a quartz bar;
- determining a cutting plane in a coordinate system comprising an optic axis, an electrical axis and a mechanical axis perpendicular to each other for cutting the quartz bar, the cutting plane having a first angle of about 35° to about 36° from the optic axis, and a second angle of about 14° to about 16° from the electrical axis rotated around the optic axis;
- and
- cutting the quartz bar along the cutting plane to obtain a quartz crystal of the quartz crystal resonator.
A method of making a quartz crystal resonator, comprising:
- obtaining a quartz bar in a coordinate system comprising an optic axis, an electrical axis and a mechanical axis perpendicular to each other;
- orienting the quartz bar to position a cutting plane of the quartz bar at an AT-cut angle;
- orienting the quartz bar to position the cutting plane at an angle of about 14° to about 16° from the electrical axis rotated around the optic axis;
- and
- cutting the quartz bar along the cutting plane to obtain a quartz crystal of the quartz crystal resonator.
Dependencies are inferred from the claim text.