Flexible Wiring Sheet for Stable Probe Electrical Contact
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Solution Overview
Problem
Existing electrical connection apparatuses face challenges in stably connecting probes to objects to be inspected, leading to excessive load on the probes, which can result in breakage due to their load endurance limit.
Innovation Solution
An electrical connection apparatus featuring a flexible wiring sheet with elastic deformation capabilities, including a first and second layer that mitigates the load on probes by allowing elastic contact with electrode pads, reducing the need for excessive force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the probe is pressed against the wiring board to ensure stable connection, then the connection stability is improved, but the load on the probe increases beyond its endurance limit
Solution Approach 1:
The patent introduces a flexible wiring sheet as an intermediary component between the probe and the wiring board. This wiring sheet includes a first layer through which the probe passes and a second layer with connection portions that contact electrode pads. The wiring sheet absorbs and distributes the pressing force, preventing excessive load concentration on the probe while maintaining stable electrical connection.
Solution Approach 2:
The patent employs a flexible wiring sheet with multiple layers that can elastically deform under pressure. The first layer is designed to be flexible, allowing it to deform when the probe applies pressure, thereby accommodating the connection without transmitting excessive force to the probe. This flexibility enables stable connection while protecting the probe from overload.
2Reliability
If the probe is pressed harder against the wiring board, then the electrical contact reliability is improved, but the probe structure becomes more vulnerable to breakage
Solution Approach 1:
The flexible wiring sheet serves as a mediator that decouples the mechanical stress from the probe structure. The probe passes through the first layer of the wiring sheet, which absorbs the mechanical deformation, while the electrical connection is maintained through the conductive paths in the wiring sheet layers, protecting the probe from structural damage.
Solution Approach 2:
The patent changes the mechanical parameters of the connection system by introducing a flexible wiring sheet with controlled elasticity. The first layer of the wiring sheet is designed with specific flexibility characteristics that allow it to deform under pressure, converting the rigid probe-wiring board interface into a compliant connection that protects the probe while ensuring reliable electrical contact.
3Measurement precision
If the probe is positioned closer to the wiring board for better alignment, then the measurement precision is improved, but the load on the probe increases
Solution Approach 1:
The flexible first layer of the wiring sheet allows the probe to be positioned closely to the wiring board for precise alignment while absorbing the mechanical stress through elastic deformation. The flexibility of the first layer enables close positioning without transmitting excessive force to the probe, thus maintaining both measurement precision and probe safety.
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 apparatus stabilizes probe connections, prevents breakage, and enhances measurement accuracy by reducing the load on probes, allowing for closer alignment and improved high-frequency current characteristics.
Implementation Method 1
The first layer is elastically deformed such that the first connection portion, which has received a pressing force from the probe, comes into contact with the electrode pad
Data Source
AI summary
An electrical connection apparatus includes: a probe; a probe head holding the probe; a wiring sheet with flexibility including a first connection portion arranged on a first sheet surface facing the probe head and a second connection portion arranged on a second sheet surface; and a wiring board which is arranged facing the probe head with the wiring sheet therebetween and has a first electrode facing the second connection portion. The wiring sheet include: a first layer through which the first connection portion passes; a wiring layer which includes an electrode pad arranged facing the first connection portion and an internal circuit electrically connected to the electrode pad; and a second layer through which the second connection portion passes. The first layer is elastically deformed such that the first connection portion, which has received a pressing force from the probe, comes into contact with the electrode pad.