Quartz Resonator Opening Structure for Stress Isolation
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Solution Overview
Problem
The conversion of single-crystal quartz into twin or polycrystalline quartz during laser cutting and the transmission of stress to the vibration region affect the natural resonance frequencies of quartz resonators, leading to compromised vibration characteristics.
Innovation Solution
The resonator design incorporates an opening between the vibration region and protrusion portion with a longer first side adjacent to the vibration region, isolating stress, and a frame portion for laser cutting to retain polycrystalline phenomena on the periphery, thereby maintaining the vibration region in a single-crystal state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser cutting is used to cut the quartz wafer, then the manufacturing efficiency is improved, but the single-crystal quartz material is converted into twin or polycrystalline quartz material, affecting the natural resonance frequencies
Solution Approach 1:
The quartz wafer is divided into a vibration region and a frame portion through laser cutting. The frame portion is specifically designed to bear the laser cutting heat and stress, while the vibration region is protected to maintain its single-crystal structure. This segmentation allows the cutting process to occur without compromising the critical vibration region's crystal integrity.
Solution Approach 2:
The frame portion acts as an intermediary that absorbs the harmful effects of laser cutting. By positioning the laser cutting path within the frame portion and using the frame as a heat sink and stress buffer, the vibration region is protected from thermal damage and stress-induced crystal structure changes.
2Reliability
If the protrusion portion is dispensed and fixed to the base, then the resonator structure is stabilized, but stress is transmitted to the vibration region, affecting the vibration characteristics
Solution Approach 1:
The resonator structure is segmented into a vibration region and a frame portion, with the protrusion portion extending from the frame. This segmentation isolates the stress transmission path to the frame portion, preventing stress from reaching the vibration region and affecting its vibration characteristics.
Solution Approach 2:
Different regions of the resonator are designed with different functions: the frame portion is designed to bear mechanical stress and provide structural stability, while the vibration region is optimized for vibration characteristics. The opening between these regions further enhances this local differentiation by isolating stress paths.
3Object-affected harmful factors
If the opening has a longer first side adjacent to the vibration region, then stress isolation is improved, but the structural strength is reduced
Solution Approach 1:
The opening is designed with asymmetric dimensions, where the first side adjacent to the vibration region is longer than the second side. This asymmetric design optimizes stress isolation by creating a larger buffer zone near the vibration region, while the overall opening size is controlled to maintain structural strength.
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 design optimizes vibration characteristics by isolating stress and preventing laser-induced polycrystalline conversion, ensuring the resonator maintains good vibration performance.
Implementation Method 1
a laser is used for cutting. However, when the laser heats and cuts the quartz wafer
Implementation Method 2
it is easy to convert the single-crystal quartz material into the twin or polycrystalline quartz material
Implementation Method 3
A resonator is an electronic component that utilizes piezoelectric properties of materials and natural resonance frequencies of the materials
Implementation Method 4
natural resonance frequencies of the materials
Data Source
AI summary
A resonator including a vibration structure, a first electrode, and a second electrode is provided. The vibration structure includes a vibration region, a protrusion portion, an opening, and a frame portion. The vibration region has a first surface and a second surface opposite to the first surface. The protrusion portion surrounds the vibration region. The opening is disposed at a side of the vibration region and between the vibration region and the protrusion portion. The opening has a first side adjacent to the vibration region and a second side far away from the vibration region. The second side is opposite to the first side. A length of the first side is greater than a length of the second side. The frame portion surrounds the protrusion portion. The first electrode is disposed on the first surface. The second electrode is disposed on the second surface.