Rotationally Symmetrical Testing Fixture for PCB Orientation
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Solution Overview
Problem
Existing testing fixtures for printed circuit boards (PCBs) are inefficient due to the requirement for precise orientation of PCBs with plated through holes, limiting assembly degree of freedom and making the mounting process inconvenient.
Innovation Solution
A testing fixture with a base and frame that define a first recess and two transverse recesses, featuring rotationally symmetrical electrical contacts and lines, allowing the PCB to be mounted in various orientations, with a fixed block and fastening members to secure the PCB when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional testing fixtures with fixed orientation are used, then the PCB must be precisely oriented during mounting, but this limits the assembly degree of freedom and makes the mounting process inconvenient
Solution Approach 1:
The patent applies asymmetry by designing electrical contacts with different configurations in different quadrants of the base. Specifically, the first and second sets of electrical contacts are arranged differently from the third and fourth sets, allowing the PCB to be mounted in multiple orientations (0°, 90°, 180°, 270°) while maintaining proper electrical connection. This asymmetric yet systematic arrangement enables versatile mounting orientations without requiring precise orientation control.
Solution Approach 2:
The testing fixture achieves universality by designing a multi-functional base that can accommodate PCBs in multiple orientations. The base includes four sets of electrical contacts (first, second, third, and fourth sets) arranged to support various mounting configurations. Additionally, the base can function both as a support structure and as an electrical connection interface, eliminating the need for separate orientation-specific fixtures.
2Adaptability or versatility
If multiple sets of electrical contacts are arranged rotationally symmetrical on the base, then the PCB can be mounted in various orientations, but this increases the device complexity
Solution Approach 1:
The electrical contact system is segmented into four distinct sets (first, second, third, and fourth sets) positioned in different quadrants of the base. Each set handles specific orientation scenarios, dividing the complex multi-orientation problem into manageable segments. This segmentation allows each contact set to be simpler in design while collectively providing comprehensive multi-orientation support.
Solution Approach 2:
The patent implements four sets of electrical contacts, which may be more than the minimum required for basic functionality. This excessive action ensures that all possible mounting orientations (0°, 90°, 180°, 270°) are supported with redundancy, allowing partial usage depending on the specific mounting requirement while maintaining overall system robustness.
Data Source
AI summary
The present disclosure provides a testing fixture. The testing fixture includes a carrier, a plurality of sets of electrical lines and a plurality of electrical lines. The carrier includes a base and a frame extending along an upper surface of the base. The base and the frame define a first recess, a second recess extending longitudinally from the first recess, and a third recess extending transversely from the first recess. The plurality of sets of electrical contacts are disposed on the base and arranged in a rotationally symmetrical manner, and the electrical lines are electrically connected to the plurality of sets of electrical contacts.