Resonator Support Arm Through-Hole Bonding to Prevent Short Circuits
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Solution Overview
Problem
The existing quartz crystal oscillators have insufficient bonding strength due to small contact areas between the resonator element and the electrically-conductive adhesive, which can lead to weak bonding and potential short circuits when the adhesive spreads.
Innovation Solution
Incorporating a through hole in the support arm of the resonator element allows the adhesive to contact both the support arm and the inner surface of the hole, increasing the contact area and preventing spreading, thereby enhancing bonding strength and preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the electrically-conductive adhesive is applied to a larger area to increase bonding strength, then the bonding strength with the resonator element is improved, but the vibrating element size increases and short circuit risk occurs
Solution Approach 1:
The invention transitions from a two-dimensional planar contact area to a three-dimensional contact structure by forming a protrusion that extends vertically from the base section. This allows the adhesive to bond at multiple levels (top surface and side surface of the protrusion), increasing bonding strength without expanding the horizontal footprint of the vibrating element.
Solution Approach 2:
The contact area is segmented into multiple distinct surfaces: the top surface of the protrusion and the side surface of the protrusion. This segmentation allows the adhesive to form separate bonding zones that collectively provide enhanced bonding strength while maintaining a compact overall structure.
2Strength
If the electrically-conductive adhesive is applied to a larger area to increase bonding strength, then the bonding strength with the resonator element is improved, but the risk of adhesive contact with another electrode causing short circuit increases
Solution Approach 1:
By extending the contact area vertically through the protrusion structure, the invention achieves enhanced bonding strength in the vertical dimension while maintaining horizontal separation from adjacent electrodes. This dimensional transition allows the adhesive to be confined to a localized vertical region, preventing lateral spread that could cause short circuits.
3Strength
If the contact area between the resonator element and adhesive is increased, then the bonding strength is improved, but the adhesive spreads more easily causing unwanted effects
Solution Approach 1:
The protrusion creates localized bonding zones at specific positions (top surface and side surface) where the adhesive is needed for strong bonding. The geometric constraints of the protrusion structure locally contain the adhesive, preventing it from spreading to areas where it is not needed, thus maintaining compositional stability.
Data Source
AI summary
A resonator element includes a base section, at least one pair of vibrating arms protruding from the base section, a support arm protruding from the base section, and a first through hole provided to the support arm, and penetrating the support arm in a thickness direction, and is fixed to an object via an adhesive entering the first through hole.