Connector Retainer Recess for Incomplete Terminal Insertion Detection
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Solution Overview
Problem
In connectors with a front mask integrated retainer, it is difficult to accurately detect incomplete terminal insertion due to the retainer's projection being small, making visual confirmation or using an inspection slider ineffective, especially when the connector is small in size.
Innovation Solution
A connector design with a retainer body and front mask portion that includes a recess allowing the body end part to project forward, enabling an inspection slider to contact the retainer body and detect incomplete insertion, even when the retainer is integrated, by reducing the projection amount from the housing and ensuring the inspection slider can interfere with the body end part at incompletely inserted positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the front mask portion and retainer portion are integrated in the retainer, then the device complexity is reduced, but the measurement precision of incomplete insertion detection deteriorates because the projection amount becomes too small to be detected
Solution Approach 1:
The retainer is divided into two functional portions: the front mask portion that covers the housing front surface, and the retainer portion that performs locking. This segmentation allows the retainer portion to project from the housing when insertion is incomplete, enabling detection while maintaining the integrated structure benefits.
Solution Approach 2:
The inspection slider acts as an intermediary detection tool that contacts the projecting retainer portion to detect incomplete insertion. The slider translates the small projection of the retainer portion into a detectable signal, solving the measurement precision problem without increasing retainer complexity.
2Volume of moving object
If the connector size is reduced, then the compactness is improved, but the detection capability deteriorates because the projection amount of the retainer becomes too small to be visually confirmed or detected by inspection slider
Solution Approach 1:
The retainer portion is designed with different projection characteristics at different positions. The body end part of the retainer portion projects from the housing end surface when insertion is incomplete, creating a localized detection feature that maintains effectiveness even in compact connectors.
Solution Approach 2:
Visual detection is replaced with mechanical detection using the inspection slider. The slider mechanically contacts the projecting retainer portion, providing reliable detection that does not depend on visual confirmation, which is ineffective in compact connectors with small projection amounts.
3Ease of manufacture
If the retainer is designed as a front mask integrated type, then the manufacturing simplicity is improved, but the ease of operation for detection deteriorates because the inspection slider cannot contact the retainer portion to perform detection
Solution Approach 1:
The integrated retainer is segmented into front mask portion and retainer portion, allowing the retainer portion to move independently and project from the housing during incomplete insertion, enabling inspection slider contact while maintaining manufacturing simplicity of the integrated structure.
Solution Approach 2:
The retainer portion is designed to be movable between a retracted position (when terminal is fully inserted) and a projecting position (when terminal is incompletely inserted). This dynamic behavior enables automatic detection positioning without complex manual operation.
Data Source
AI summary
A retainer includes a retainer body to be arranged inside the body mounting portion, a front mask portion to be arranged to cover the front surface portion and a coupling portion coupling the retainer body and the front mask portion. The retainer body includes a body end part having a projection amount from the end surface portion reduced from a temporary locking position to a complete locking position and a retaining portion for locking a terminal fitting at the complete locking position. The body end part is arranged inside the housing at the complete locking position. The front mask portion includes a recess for allowing a front surface of the body end part to be open forward at a halfway position.