AT-Cut Crystal Mounting Structure for Impact Resistance
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Solution Overview
Problem
As AT-cut crystal units downsize, conventional manufacturing methods face challenges in securing crystal elements, leading to deterioration of properties due to close proximity of mounting portions to excitation parts, and existing solutions compromise on impact resistance.
Innovation Solution
A crystal unit design featuring a rectangular AT-cut crystal element with first and second inclined portions, and secured portions that project outwards for secure mounting, utilizing a securing member to attach the crystal element to a container, thereby improving impact resistance and crystal impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If concave portions are formed on the principal surface to enhance adhesive bite, then impact resistance is improved, but the distance between mounting portion and excitation part decreases causing property deterioration
Solution Approach 1:
The patent transitions from forming concave portions on the principal surface (2D approach) to forming inclined portions on the side surface (3D approach). This dimensional change allows the mounting portion to be positioned farther from the excitation part while still providing adequate adhesive bonding area, thus resolving the contradiction between impact resistance and property deterioration.
2Volume of moving object
If the crystal element is downsized, then the crystal unit size is reduced, but the mounting portion approaches the excitation part causing property deterioration
Solution Approach 1:
By utilizing the side surface of the crystal element for mounting purposes through inclined portions, the patent effectively uses vertical space rather than horizontal space. This allows downsizing of the crystal element while maintaining adequate separation between the mounting portion and excitation part, thus preventing property deterioration.
3Reliability
If inclined portions are formed at end portions to cut off vibration energy, then property deterioration is restrained, but impact resistance is compromised
Solution Approach 1:
The patent applies different functional characteristics to different regions: the inclined portions on the side surface provide vibration energy cutoff, while the protruding secured portions provide enhanced adhesive bonding for impact resistance. This localized functional differentiation resolves the contradiction between restraining property deterioration and maintaining impact resistance.
Data Source
AI summary
A crystal unit includes an AT-cut crystal element and a container. The AT-cut crystal element has an approximately rectangular planar shape. The AT-cut crystal element includes a first inclined portion, second inclined portions, and a first secured portion. The first inclined portion is inclined such that the crystal element decreases in thickness from a proximity of the first side to the first side. The second inclined portions are disposed on respective both ends of the first side, the second inclined portions being formed integrally with the first inclined portion. The second inclined portions are inclined gentler than the first inclined portion. The first secured portion and a second secured portion are formed integrally with the second inclined portion. The first secured portion and the second secured portion each project out from the first side to outside the crystal element to be used for securing with the securing members.