METHODS FOR ADJUSTING FREQUENCY OF PIEZOELECTRIC VIBRATING PIECES, PIEZOELECTRIC DEVICES, AND TUNING-FORK TYPE PIEZOELECTRIC OSCILLATORS
First Claim
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1. A piezoelectric frame, comprising:
- a tuning-fork type piezoelectric vibrating piece comprising a base portion, at least a pair of vibrating arms extending in a first direction from one edge of the base portion, and respective excitation electrodes on the vibrating arms;
a respective supporting arm extending in the first direction from an external edge of each vibrating arm;
an outer frame portion surrounding the tuning-fork type piezoelectric vibrating piece; and
respective connecting portions having designated widths connecting the supporting arms to the outer frame portion.
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Abstract
A piezoelectric frame includes a tuning-fork type piezoelectric vibrating piece having excitation electrodes on each of at least two vibrating arms extending in a first direction from one end of a base portion thereof. Respective supporting arms extend in a first direction from respective external edges of the vibrating arms. An outer frame portion surrounds the tuning-fork type piezoelectric vibrating piece. The connecting portions have designated widths and connect the respective supporting arms to the outer frame portion. During manufacture, the designated widths are trimmed (e.g., by a pulsed laser) until the desired vibration frequency is obtained.
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Citations
14 Claims
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1. A piezoelectric frame, comprising:
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a tuning-fork type piezoelectric vibrating piece comprising a base portion, at least a pair of vibrating arms extending in a first direction from one edge of the base portion, and respective excitation electrodes on the vibrating arms; a respective supporting arm extending in the first direction from an external edge of each vibrating arm; an outer frame portion surrounding the tuning-fork type piezoelectric vibrating piece; and respective connecting portions having designated widths connecting the supporting arms to the outer frame portion. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for adjusting vibration frequency of a piezoelectric device, comprising:
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forming a piezoelectric frame having a tuning-fork type piezoelectric vibrating piece comprising (a) at least two vibrating arms extending in a first direction from one edge of a base portion, (b) respective excitation electrodes on each vibrating arms, (c) a respective supporting arm for each vibrating arm, the supporting arms extending in an extension direction of the vibrating arms from respective outer edges of the vibrating arms, (d) an outer frame portion surrounding the tuning-fork type piezoelectric vibrating piece, and (e) a respective connecting portion having a designated width connecting each supporting arm to the outer frame portion; measuring oscillation frequency of the vibrating arms by connecting a potential to the excitation electrodes; and trimming material from the designated width of the connecting portion, based on the measured oscillation frequency, so as to remove mass from the connecting portion and correspondingly increase the vibration frequency. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification