Endoscope Cable Connection Structure with Shield Reinforcement
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Solution Overview
Problem
Endoscope cable connection structures face disconnection and detachment issues due to stress from bending, particularly at the curve portions, which can lead to malfunction and image quality degradation.
Innovation Solution
A cable connection structure featuring a single-wire cable positioned between two coaxial cables, with exposed core wires and shields connected to specific electrodes on a substrate, using a conductive member to absorb stress and prevent disconnection, while the shields are connected via solder and a grand bar to reduce stress transmission to the single-wire cable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the curve portion is curved in four directions in a subject, then the endoscope can perform multi-directional inspection, but stress in radial direction is added to the insertion portion causing cable disconnection and detachment
Solution Approach 1:
The patent applies beforehand cushioning by providing a reinforcing member (grand bar) that connects the shields of coaxial cables before stress from bending can cause disconnection. This reinforcing member is positioned to absorb radial stress in advance, preventing cable disconnection and detachment when the curve portion is bent in four directions during multi-directional inspection
2Reliability
If the core wire is connected to the substrate in a looser state than the shield, then disconnection is prevented, but the connection structure becomes more complex
Solution Approach 1:
The patent merges the functions of multiple components by having the grand bar simultaneously connect the shields of multiple coaxial cables and provide reinforcement against radial stress. This combining approach prevents cable disconnection while avoiding the need for separate complex connection structures for each cable, thus reducing overall device complexity while maintaining reliability
Data Source
AI summary
A cable connection structure includes: a substrate including a first core wire connection electrode, a second core wire connection electrode, and a shield connection electrode; a single-wire cable including a first core wire, and an insulant; at least two coaxial cables each including a second core wire, an inner insulant, a shield, and an outer insulant, wherein the second core wire, the inner insulant, and the shield are exposed in a step-by-step manner at a distal end portion, and the second core wire and the shield are respectively connected to the second core wire connection electrode and the shield connection electrode; and a conductive member connecting exposed portions of the shields. The conductive member is disposed directly on an upper surface of the insulant, and connects the shields on the shield connection electrode and/or a position closer to a proximal end side than the shield connection electrode.