Method of Making a Resonator Having a Desired Frequency from a Quartz Crystal Resonator Plate.
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
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The general object of this invention is to provide a method of making a resonator from a quartz crystal resonator plate. A more particular object of the invention is to provide such a method in which the resonator will have a desired frequency. A further object of the invention is to provide such a method of making a high frequency fundamental mode resonator in which the resonator will have a desired frequency. A still further object of the invention is to provide such a method that is dry, that is inexpensive to set up and operate, that produces no surface damage or high levels of ionizing radiation, that permits the direct and precise monitoring of the resonator frequency during the method, that permits the independent adjustment of individual electrodes on multiple electrode devices such as monolithic crystal filters, and that minimizes the aging due to oxidation of the electrodes. It has been found that the aforementioned objects can be attained by a method including the steps of etching the quartz crystal resonator plate to a frequency slightly higher than the desired frequency, and depositing metallic electrodes onto the active area of the resonator plate to lower the frequency that very closely approaches the desired frequency. Patent applications
- Electrical and Electronic Equipment