Microresonator of double-ended tuning fork configuration
Patent 4469979 Issued on September 4, 1984. Estimated Expiration Date: 
May 27, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 27, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3601639 Miniature quartz resonator force transducer Force transducer Electrode for tuning fork type quartz crystal vibrator Multiple mode piezoelectric resonator Microresonator of tuning fork configuration operating at its second overtone frequency Patent #: 4415827 InventorAssigneeApplicationNo. 06/498768 filed on 05/27/1983US Classes:310/370, "U" or "tuning fork" shape310/367Piezoelectric element shapeExaminersPrimary: Miller, J. D.Assistant: Rebsch, D. L. Attorney, Agent or FirmInternational ClassesH03H 9/00 (20060101)H03H 9/215 (20060101) AbstractIn 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. | |
