Microresonator of double-ended tuning fork configuration
First Claim
1. In a quartz crystal microresonator of the type including first and second stem portions, a pair of integral tines extending between said stem portions, a slot between said tines, said slot having opposed crotches where said tines join said stem portions, and a plurality of electrodes mounted on each of said tines, spaced along the length thereof, said electrodes being adapted for receipt of an AC voltage for causing said tines to oscillate, the improvement wherein the crystal orientation is (ZYw) θ
- and said electrodes are mounted onn said tines such that the polarity of the electrodes changes along the length of the tines at points derived by determining where the second derivative of the lateral displacement of the tines with respect to length changes polarity.
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Accused Products
Abstract
In a quartz crystal microresonator of the type including first and second stem portions, a pair of integral tines extending between the stem portions, a slot between the tines, the slot having opposed crotches where the tines join the stem portions, and a plurality of electrodes mounted on each of the tines, spaced along the lengths thereof, the electrodes being adapted for receipt of an AC voltage for causing the tines to oscillate, there are disclosed several different electrode configurations to optimize resonator performance when operating in the fundamental and first and second overtone flexure modes. The electrodes change polarity along the length of the tines at points where the second derivative of displacement changes polarity.
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Citations
11 Claims
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1. In a quartz crystal microresonator of the type including first and second stem portions, a pair of integral tines extending between said stem portions, a slot between said tines, said slot having opposed crotches where said tines join said stem portions, and a plurality of electrodes mounted on each of said tines, spaced along the length thereof, said electrodes being adapted for receipt of an AC voltage for causing said tines to oscillate, the improvement wherein the crystal orientation is (ZYw) θ
- and said electrodes are mounted onn said tines such that the polarity of the electrodes changes along the length of the tines at points derived by determining where the second derivative of the lateral displacement of the tines with respect to length changes polarity.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. In a quartz crystal microresonator of the type including first and second stem portions, a pair of integral tines extending between said stem portions, a slot between said tines, said slot having opposed crotches where said tines join said stem portions and a plurality of electrodes mounted on each of said tines, spaced along the length thereof, said electrodes being adapted for receipt of an AC voltage for causing said tines to oscillate, the improvement wherein each of said tines has a pair of opposed shoulders where said tines join said stem portions and wherein the widths of said shoulders at said opposite ends of said tines are approximately equal and approximately equal to one-half of the width of said crotches.
Specification