Terminal Protrusion Structure for Thermally Stable PCB Connections
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Solution Overview
Problem
Existing vehicle sound generators are prone to malfunctions due to temperature changes, leading to issues such as crack formation and conduction failures in soldered connections, and increasing manufacturing costs when flexible wires are used to mitigate these issues.
Innovation Solution
The electrical device features a terminal protrusion that extends from the housing inner wall and connects to the substrate at an end portion, reducing stress on the connection by allowing flexible deformation, thus eliminating the need for additional wires and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soldered connections are used to connect the terminal to the substrate, then electrical connection is achieved, but crack formation and conduction failures occur due to temperature changes
Solution Approach 1:
The terminal protrusion is designed to be flexible rather than rigid, allowing it to dynamically adapt to temperature-induced dimensional changes. The protrusion can bend and deform elastically when temperature changes cause expansion or contraction of the housing or substrate, preventing stress concentration that would lead to solder joint cracks while maintaining continuous electrical connection.
Solution Approach 2:
The terminal structure changes its physical state from a rigid soldered connection to a flexible protrusion that can change its shape parameter in response to temperature variations. This flexibility allows the connection to accommodate dimensional changes without failing, transforming the connection from a static rigid joint to a dynamic adaptable structure.
2Reliability
If flexible wires are used to connect the terminal to the substrate, then stress on connections is reduced, but manufacturing cost increases
Solution Approach 1:
The terminal protrusion integrates the functions of both a rigid terminal and a flexible wire into a single monolithic structure. Instead of using separate rigid terminals connected by flexible wires, the invention combines these elements into one piece that is directly formed on the substrate, eliminating the need for additional wires and reducing assembly steps while maintaining stress relief capabilities.
Solution Approach 2:
The invention extracts the flexibility requirement from a separate wire component and incorporates it directly into the terminal structure itself. The terminal protrusion takes out the need for additional flexible connection elements by embedding the flexibility directly in the terminal's own geometry, simplifying the overall structure and reducing component count.
3Device complexity
If a rigid terminal connection is used, then structural simplicity is maintained, but stress concentration leads to malfunctions
Solution Approach 1:
The terminal protrusion transitions from a static rigid structure to a dynamic flexible structure that can adapt its shape in response to thermal stresses. This dynamic capability allows the simple terminal design to maintain reliability by elastically deforming under stress rather than fracturing, preserving both structural simplicity and connection reliability.
Data Source
AI summary
An electrical device includes a housing, a drive unit arranged inside the housing a substrate arranged inside the housing, and a terminal electrically connecting the substrate with an external portion outside the housing. On the substrate, a circuit driving the drive unit is formed. The terminal includes a terminal protrusion exposed from an inner wall surface of the housing and protruding toward the substrate. The terminal is connected to the substrate at an end portion of the terminal protrusion. The substrate is fixed inside the housing by a first substrate attachment portion and a second substrate attachment portion arranged at a position farther from a connecting portion between the terminal and the substrate than the first substrate attachment portion. The second substrate attachment portion has higher flexibility than the first substrate attachment portion.