Card Edge Connector Guide Slope Prevents Contact Abrasion
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Solution Overview
Problem
Existing card edge connectors experience contact reliability issues due to abrasion and improper deformation of resilient pieces when corner edges of circuit boards insert into the connector, leading to potential contact failures.
Innovation Solution
A card edge connector design featuring a guide slope made of synthetic resin that covers the leading edge of the circuit board, inclined relative to the inserting direction, which allows the resilient contact portions to slide and avoid direct contact with the corner edges, preventing abrasion and ensuring reliable contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the resilient contact portion directly contacts the corner edge part of the circuit board during insertion, then contact pressure is ensured, but the corner edge part is strongly abraded and the resilient piece is improperly deformed
Solution Approach 1:
The guide slope acts as an intermediary element between the resilient contact portion and the corner edge part of the circuit board. During insertion, the resilient contact portion contacts the guide slope first, which gradually guides it onto the circuit board surface, preventing direct contact with the corner edge part and eliminating abrasion and improper deformation.
Solution Approach 2:
The guide slope performs a preliminary guiding action before the resilient contact portion reaches the circuit board. By providing an inclined surface that gradually reduces the insertion angle, the guide slope prepares the resilient contact portion for proper contact, preventing harmful abrasion before it occurs.
2Object-affected harmful factors
If a guide slope is added to cover the leading edge of the circuit board, then abrasion is prevented, but the device complexity increases
Solution Approach 1:
The guide slope is merged with the housing structure, forming an integrated component rather than a separate part. This combining approach adds the protective function while minimizing the increase in device complexity, as the guide slope becomes part of the existing housing rather than requiring additional assembly.
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
The solution effectively prevents contact failures by allowing the resilient contact portions to deflect and slide on the guide slope, maintaining contact reliability and preventing plating peeling and jamming, while allowing for flexible material selection for the guide slope to avoid coating damage.
Implementation Method 1
The resilient contact portion of the card edge connector only slides in contact with the guide slope made of synthetic resin and inclined with respect to the inserting direction
Implementation Method 2
A predetermined contact pressure is ensured between the terminal fittings and the circuit board by a resilient contact action of the resilient pieces. Further, dimensional tolerances of the housing, the terminal fittings and the circuit board are absorbed by resilient deformation of the resilient pieces.
Data Source
AI summary
It is aimed to prevent a reduction of contact reliability. A card edge connector (A) includes a first housing (10) formed with a board accommodation space (16) open forward, terminal fittings (17) provided in the first housing (10) and formed with resilient contact portions (18) projecting toward the board accommodation space (16), a second housing (20) including a circuit board (23) to be inserted into the board accommodation space (16) from front of the first housing (10), and guide slopes (36) made of synthetic resin, provided to cover a leading edge of the circuit board (23) in an inserting direction into the board accommodation space (16) and inclined with respect to the inserting direction into the board accommodation space (16).