High-stability resonators of solid elastic material and oscillators using them
First Claim
1. A resonator comprising a supporting base, a resonating solid elastic plate attached to said supporting base, at least one first electrode and at least one second electrode for respectively exciting said plate and for detecting plate vibrations, wherein said plate is excited in a contour vibration mode, said plate having a length which is an integral multiple of the width of said plate, wherein said electrodes do not adhere to said plate, said electrodes being located at the periphery of said plate at a short predetermined distance from said plate, said electrodes being opposite narrow edges of said plate and opposite vibration loops of the plate, and wherein said plate is attached to said supporting base at points corresponding to vibration nodes of said plate.
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Abstract
A preferred embodiment of a resonator embodying the invention comprises entially a resonating plate, an action electrode and a detection electrode, and a supporting base. The electrodes are placed facing symmetrical narrow edges of the plate, opposite vibration loops, and are coupled to the plate by capacitive, electrostrictive or piezoelectric effect according to the material of which the plate is comprised. A very wide range of elastic solid materials can be used to embody the resonating plate. The plate is attached to the supporting base at points corresponding to vibration nodes of the plate. The plate vibrates advantageously according to a contour mode called Lame mode. High coefficients of quality in the region of 107 are obtained. The resonators embodying the invention can be easily integrated. To do so, the plate is e.g. embodied in silicon. Such a resonator is included in a high-stability oscillating loop comprising a phase shifter and an amplifier.
21 Citations
14 Claims
- 1. A resonator comprising a supporting base, a resonating solid elastic plate attached to said supporting base, at least one first electrode and at least one second electrode for respectively exciting said plate and for detecting plate vibrations, wherein said plate is excited in a contour vibration mode, said plate having a length which is an integral multiple of the width of said plate, wherein said electrodes do not adhere to said plate, said electrodes being located at the periphery of said plate at a short predetermined distance from said plate, said electrodes being opposite narrow edges of said plate and opposite vibration loops of the plate, and wherein said plate is attached to said supporting base at points corresponding to vibration nodes of said plate.
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10. A resonator comprising a supporting base, a solid elastic resonating plate attached to said supporting base, at least one first electrode and at least one second electrode for respectively exciting said plate in a contour vibration mode and for detecting plate vibrations, said plate having a length which is an integral multiple of the width of said plate, wherein said electrodes do not adhere to said plate, said electrodes being located at the periphery of said plate at a short predetermined distance from said plate, said electrodes being opposite narrow edges of said plate and opposite vibration loops of the plate, said plate being attached to said supporting base at points corresponding to vibration nodes of said plate, and wherein said vibration mode is a Lame mode wherein volume acoustic waves are radiated in directions at 45°
- from said narrow edges of said plate.
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11. An oscillator comprising a resonator, phase shifting means and amplifying means connected in a loop, and wherein said resonator includes:
- a supporting base, a resonating solid elastic plate attached to said supporting base, at least one first electrode and at least one second electrode for respectively exciting said plate and for detecting plate vibrations, wherein said plate is excited in a contour vibration mode, said plate having a length which is an integral multiple of the width of said plate, wherein said electrodes do not adhere to said plate, said electrodes being located at the periphery of said plate at a short predetermined distance from said plate, said electrodes being opposite narrow edges of said plate and opposite vibration loops of the plate, and wherein said plate is attached to said supporting base at points corresponding to vibration nodes of said plate.
- View Dependent Claims (12, 13, 14)
Specification