PIEZOELECTRIC RESONATOR

• US 20090289531A1
• Filed: 05/22/2009
• Published: 11/26/2009
• Est. Priority Date: 05/23/2008
• Status: Active Grant

• Current Assignee: Statek Corp. (Technicorp International II, Inc.)
• Original Assignee: Statek Corp. (Technicorp International II, Inc.)
• Inventors: FANG, YUE, CHUANG, SHIH
• Granted Patent: US 8,446,079 B2
• Time in Patent Office: Days
• US Class Current: 310/370
• CPC Class Codes: H03H 9/21 Crystal tuning forks

Abstract

Embodiments of the present disclosure are directed to a piezoelectric resonator. The resonator can have a base defining at least a first base portion and a second base portion and two or more vibrating arms projecting from the first base portion, the first vibrating arm being substantially parallel to the second vibrating arm. The resonator can define a generally planar first main surface and a generally planar second main surface defined by the base and the first and second vibrating arms wherein the first main surface is generally parallel to the second main surface. At least one groove can be formed in at least one of the first and second main surfaces of each of the first and second vibrating arms. The resonator can further have at least one vibration isolation arm projecting from the base, the vibration isolation arm being approximately perpendicular to the two or more vibrating arms.

Claims

1. A piezoelectric resonator comprising:

a base defining a first base portion and a second base portion;

a first and a second vibrating arm projecting from a first edge of the first base portion of the base;

a first vibration isolation arm projecting from a first lateral edge of the first portion of the base, and a second vibration isolation arm projecting from a second lateral edge of the first portion of the base so as to be collinear with the first vibration isolation arm, the second lateral edge being opposite and approximately parallel to the first lateral edge, and the first and second vibration isolation arms being approximately perpendicular to the first and second vibrating arms;

a generally planar first main surface and a generally planar second main surface defined by the base and the first and second vibrating arms, the first main surface being generally parallel to the second main surface; and

an opening formed in each of the first and second vibrating arms, the opening projecting from the first main surface to the second main surface of at least one of the first and second vibrating arms, the opening being configured to conduct an electrical current between the first and second main surfaces of the resonator;

wherein;

the first and second vibration isolation arms are sized and configured such that a width of the first base portion is greater than a width of any portion of the second base portion.

2. The resonator of claim 1, wherein the first and second vibration isolation arms are sized and configured such that a width of the first base portion is from approximately 20% to approximately 40% greater than a width of any portion of the second base portion.

3. The resonator of claim 1, further comprising a channel formed in the second base portion of the base, the channel being formed in a direction that is parallel to the first and second vibrating arms.

4. The resonator of claim 1, further comprising at least one groove formed in at least one of the first and second main surfaces of each of the first and second vibrating arms.

5. A piezoelectric resonator comprising:

a base;

a first vibrating arm and a second vibrating arm projecting from the base;

a generally planar first main surface and a generally planar second main surface defined by the base and the first and second vibrating arms, the first main surface being generally parallel to the second main surface; and

a first and a second vibration isolation arm projecting from the base, the first and second vibration isolation arms being approximately perpendicular to the first and second vibrating arms.

6. The resonator of claim 5, wherein the base comprises a first base portion and a second base portion, and the first and second vibration isolation arms project from the first base portion of the base.

7. The resonator of claim 6, wherein the first and second vibration isolation arms are sized and configured such that a width of the first base portion is greater than a width of any portion of the second base portion.

8. The resonator of claim 6, wherein the first and second vibration isolation arms are sized and configured such that a width of the first base portion is approximately 30% greater than a width of any portion of the second base portion.

9. The resonator of claim 6, wherein the first and second vibration isolation arms are sized and configured such that a width of the first base portion is from approximately 20% to approximately 40% greater than a width of any portion of the second base portion.

10. The resonator of claim 6, wherein the second base portion has a uniform width along the entire length of the second base portion.

11. The resonator of claim 6, wherein the second base portion tapers along the length thereof.

12. The resonator of claim 5, wherein the first and second vibration isolation arms project from the base in mutually opposing directions and are collinear.

13. The resonator of claim 5, further comprising an opening formed in each of the first and second vibrating arms, the opening extending from the first main surface to the second main surface of at least one of the first and second vibrating arms.

14. The resonator of claim 13, wherein an electrode is disposed on a surface of the opening to conduct an electrical current between the first and second main surfaces of the resonator.

15. The resonator of claim 5, further comprising a channel formed in the base, the channel being formed in a direction that is parallel to the first and second vibrating arms.

16. The resonator of claim 15, wherein the channel is formed in the second base portion of the base.

17. The resonator of claim 15, wherein a longitudinal length of the channel is greater than a mounting length of the resonator.

18. The resonator of claim 15, wherein a longitudinal length of the channel is less than a longitudinal length of the second base portion.

19. The resonator of claim 5, further comprising at least one groove formed in at least one of the first and second main surfaces of each of the first and second vibrating arms.

20. The resonator of claim 19, further comprising an electrode disposed on the at least one groove formed in at least one of the first and second main surfaces of each of the first and second vibrating arms.

21. The resonator of claim 19, further comprising an opening formed in at least one of the first and second vibrating arms adjacent to the at least one groove, the opening extending from the first main surface to the second main surface.

22. The resonator of claim 5, further comprising two generally parallel grooves formed in at least one of the first and second main surfaces of each of the first and second vibrating arms.

23. The resonator of claim 5, wherein first vibrating arm is substantially parallel to the second vibrating arm.

24. A piezoelectric resonator comprising:

a base defining a first edge and a base edge that is generally parallel to the first edge, a first base portion and a second base portion, the first base portion being defined as the portion of the base between the first edge and the second base portion, and the second base portion being defined as the portion of the base between the first base portion and the base edge;

a first vibrating arm and a second vibrating arm projecting from the first edge of the base;

a generally planar first main surface and a generally planar second main surface defined by the base and the first and second vibrating arms, the first main surface being generally parallel to the second main surface; and

at least one groove formed in at least one of the first and second main surfaces of each of the first and second vibrating arms;

wherein the base is sized and configured such that a width of the first base portion is from approximately 20% to approximately 40% greater than a width of any portion of the second base portion.