Multi-Arm Resonator Support Geometry for Better DLD Control
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Solution Overview
Problem
Existing resonators face challenges in improving drive level dependency (DLD) while maintaining a high regulation rate for resonant frequency, which can lead to decreased manufacturing efficiency due to longer production times.
Innovation Solution
A resonator design featuring a vibrating portion with multiple vibrating arms that bend out of plane with different phases, a holding portion, and a support arm. The support arm is strategically connected to the base portion within a specific range relative to the center line of the vibrating portion, optimizing the support arm's length and connection position to enhance frequency regulation and reduce DLD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a structure for improving DLD is implemented, then drive level dependency is improved, but regulation rate for resonant frequency decreases
Solution Approach 1:
The patent changes the geometric parameters of the support arm, specifically setting its length to 0.2-0.4 times the length of the vibrating arms and positioning its connection point on the base within a specific range from -0.1Wb to 0.1Wb relative to the center line. This parameter optimization allows the resonator to achieve improved DLD characteristics while maintaining a high regulation rate for resonant frequency, thus resolving the technical contradiction between reliability and productivity.
2Manufacturing precision
If regulation time is increased to improve resonant frequency regulation, then regulation accuracy is improved, but manufacturing efficiency decreases
Solution Approach 1:
By optimizing the support arm length (0.2-0.4 times the vibrating arm length) and connection position (within -0.1Wb to 0.1Wb from center line), the patent achieves a balance where sufficient regulation accuracy is obtained without requiring excessive regulation time, thereby maintaining high manufacturing efficiency while ensuring precise resonant frequency regulation.
3Stability of the object's composition
If support arm length is increased, then structural stability is improved, but regulation rate for resonant frequency decreases
Solution Approach 1:
The patent determines the optimal support arm length to be 0.2-0.4 times the length of the vibrating arms, which provides sufficient structural stability for the resonator while avoiding excessive length that would reduce the regulation rate for resonant frequency. This optimized parameter range resolves the contradiction between stability and productivity.
Solution Approach 2:
The patent replaces a conventional support structure with an optimized support arm design that has specific dimensional relationships to the vibrating arms. This mechanical substitution achieves both structural stability and high regulation rate through the optimized geometry, rather than using a traditional support structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed design effectively improves DLD and inhibits the decrease in the regulation rate for the resonant frequency, thereby enhancing manufacturing efficiency by reducing production time.
Implementation Method 1
a plurality of vibrating arms numbering in three or more, each having a fixed end, and including at least two vibrating arms that bend out of plane with different phases
Data Source
AI summary
A resonator is provided that includes a vibrating portion including three or more vibrating arms with at least two vibrating arms that bend out of plane with different phases and a base. The resonator also includes a frame that holds the vibrating portion; and a support arm having one end connected to the frame and the other end connected to a rear end portion of the base. The other end of the support arm is connected to a position in a range from −0.1 WB to 0.1 WB, with respect to a base width WB of the base, relative to a position, on the rear end portion of the base where a center line passes in a plan view. A support arm length of the support arm is 0.2 or more times and 0.4 or less times a vibrating arm length of the vibrating arms.