Pressure Sensor Terminal Recessed Groove Solder Control
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Solution Overview
Problem
Conventional pressure sensors in portable devices face instability in electrical characteristics due to excessive solder wet-spreading, which can lead to unstable support and waterproofing issues when integrated into waterproof housings.
Innovation Solution
A pressure sensor design featuring a recessed groove portion on the terminal portion to control solder wet-spreading, with a base that includes an accommodation portion for the pressure sensor element and a lead portion with a terminal portion having a recessed groove that divides it into regions to prevent solder spread, ensuring stable solder bonding and reliable waterproofing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure sensor is solder-bonded to the circuit board at the lead portion, then electrical connection is achieved, but solder excessively wet-spreads causing unstable support and electrical characteristics
Solution Approach 1:
The terminal portion is divided into a first region for solder bonding and a second region for stable support, separated by a recessed groove portion. This segmentation prevents solder from spreading to the second region, ensuring both reliable electrical connection and stable mechanical support without interference between the two functions.
Solution Approach 2:
The first region is designed with solderability characteristics to accept solder bonding, while the second region is designed with support characteristics to provide stable mechanical foundation. The recessed groove portion creates local differentiation in function within the terminal portion, allowing each region to optimize its specific purpose.
2Reliability
If a waterproof packing is compressed between the pressure sensor and cover, then waterproof structure is achieved, but unstable support causes non-uniform compression and waterproofing failures
Solution Approach 1:
The recessed groove portion is pre-formed on the terminal portion before assembly, creating a structural feature that will prevent solder spread and provide stable support during the subsequent waterproof assembly process. This preliminary structural preparation ensures that when the packing is compressed, the support is already in place to maintain uniform compression.
3Ease of manufacture
If the terminal portion is fully exposed for solder bonding, then electrical connection is achieved, but solder spreads to unintended regions causing contact with housing and electrical instability
Solution Approach 1:
The terminal portion is segmented into a first region that remains accessible for solder bonding and a second region that is protected from solder spread by the recessed groove. This segmentation allows solder bonding to proceed effectively while preventing solder from reaching areas where it would cause electrical instability or contact with the housing.
Data Source
AI summary
A pressure sensor includes a base including an accommodation portion, a pressure sensor element disposed in the accommodation portion, and a lead portion electrically-connected to the pressure sensor element, including a terminal portion provided along a lower surface of the base, and being exposed to an outside of the base, where the terminal portion includes a recessed groove portion provided on a second surface which is an opposite surface of a first surface facing the body, and where the recessed groove portion divides at the second surface, a first region including a tip of the terminal portion and a second region next to the first region and away from the tip of the terminal portion.