Crystal Element Sloping Side Faces Reduce Oscillation Reflection
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Solution Overview
Problem
Conventional crystal elements experience deterioration in electric characteristics due to increased equivalent series resistance caused by oscillation reflection at perpendicular side faces of protrusions, leading to inefficient energy propagation and vibration displacement.
Innovation Solution
The crystal element design features sloping side faces on protrusions, allowing for reduced oscillation reflection and improved energy propagation by aligning these faces to minimize the angle between the propagating direction and the side faces, thereby decreasing the reflection amount and maintaining better electric characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the side face of the protrusion is made perpendicular to the main surface, then the manufacturing is simpler, but the oscillation reflection increases causing deterioration in electric characteristics
Solution Approach 1:
The invention changes the geometric parameter of the side face from perpendicular (90 degrees) to sloping (acute angle), specifically setting the angle between the side face and the propagating direction to 45 degrees or less. This parameter change reduces oscillation reflection and equivalent series resistance, improving electric characteristics while maintaining manufacturing feasibility through standard cutting techniques.
2Ease of manufacture
If the side face is made perpendicular to reduce manufacturing complexity, then the production process is easier, but the equivalent series resistance increases
Solution Approach 1:
The invention modifies the side face angle parameter to 45 degrees or less relative to the propagating direction, which reduces oscillation reflection and thereby decreases equivalent series resistance. This reduces energy loss in the crystal element while still being achievable through conventional manufacturing methods.
3Device complexity
If the side face is perpendicular to the main surface, then the structure is simpler, but the oscillation reflection causes deterioration in electric characteristics
Solution Approach 1:
The invention changes the side face geometry from perpendicular to sloping with an angle of 45 degrees or less to the propagating direction. This simple geometric parameter change effectively reduces oscillation reflection and improves electric characteristics without significantly increasing structural complexity or manufacturing difficulty.
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
This design effectively suppresses the deterioration of electric characteristics by reducing oscillation reflection at sloping side faces, resulting in improved energy enclosure and reduced equivalent series resistance, enhancing the crystal element's performance.
Implementation Method 1
the oscillation of the crystal piece sandwiched between the pair of excitation electrodes propagates from the outer edge of the excitation electrodes toward the outer edge of the crystal pieces in a plan view, i.e., in the direction toward the side face of the protrusion. When the oscillation propagates to the outer edge of the crystal piece, specifically to the side face of the protrusion, the oscillation is reflected at the side face of the protrusion.
Data Source
AI summary
The crystal element includes: a mesa-shaped crystal piece in a substantially rectangular shape in a plan view including an oscillation section having a first protruded section and a second protruded section; excitation electrodes provided on both main surfaces of the oscillation section; leading sections provided side by side along a prescribed side of the crystal piece; and a wiring section connecting between the excitation electrodes and the leading sections. The first protruded section and the second protruded section include sloping side faces. The side face of the first protruded section located on the +X-side overlaps with the side face of the second protruded section located on the +X side, and the side face of the first protruded section located on the −X-side overlaps with the side face of the second protruded section located on the −X side.