Stepwise Cable Connection Structure for Endoscope Devices
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Solution Overview
Problem
Conventional coaxial cable connection structures for endoscope devices face challenges in minimizing the mounting height and preventing deformation at the connection point, which can lead to noise and disconnection issues due to the thickness and rigidity of the components.
Innovation Solution
A cable connection structure where the coaxial cable is connected to a substrate with a stepwise exposure of the center conductor, inner insulator, and shield, directly connecting the shield and center conductor to their respective electrodes, reducing the height and preventing deformation, and using a stacked substrate configuration to enhance connectivity and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional coaxial cable connection structure is used, then the cable can be connected to the substrate, but the mounting height is too high and deformation occurs at the connection point
Solution Approach 1:
The substrate is divided into multiple layers (first substrate and second substrate) with different functions. The first substrate provides electrical connection with bared electrodes, while the second substrate provides mechanical support and shielding. This segmentation allows the cable to connect at a lower height while maintaining structural strength through the layered configuration.
Solution Approach 2:
The connection structure transitions from a single-plane connection to a three-dimensional stepped configuration. The first substrate extends further in the width direction than the second substrate, creating a stepped profile that allows the cable to connect at a lower mounting height while the extended first substrate provides the necessary electrical connection area.
2Length of moving object
If the substrate is made thinner to reduce mounting height, then the height is reduced, but the cable may deform or disconnect
Solution Approach 1:
The substrate system is segmented into two functional layers: the first substrate (thinner) for electrical connection and the second substrate (thicker) for mechanical support. This allows the overall structure to be thinner while maintaining reliability through the supportive second substrate that prevents cable deformation.
Solution Approach 2:
The connection structure uses a composite of multiple substrate materials with different properties. The first substrate material is optimized for electrical connection with bared electrodes, while the second substrate material provides mechanical strength and shielding, creating a composite structure that achieves both thinness and reliability.
3Device complexity
If the cable is connected directly without stepwise exposure, then the connection is simple, but noise increases due to deformation
Solution Approach 1:
The electrode connection is segmented into multiple levels: the first substrate has bared electrodes that extend further, and the second substrate is positioned behind it. This stepped segmentation allows the cable to connect in a straightforward manner while the layered electrode structure prevents deformation-induced noise without requiring complex connection procedures.
Data Source
AI summary
A cable connection structure includes a substrate and a coaxial cable connected to the substrate. The coaxial cable has: a conductor; an inner insulator that coats an outer periphery of the conductor; a shield that coats an outer periphery of the inner insulator; and an outer insulator that coats an outer periphery of the shield. The substrate has: a plate-shaped insulating base material; a conductor connection electrode to which the conductor is connected; and a shield connection electrode to which the shield is connected. A ground is provided on a back surface of the base material opposite to where the conductor connection electrode is formed. The shield connection electrode is an exposed portion of the ground. At a connection part of the substrate to which the coaxial cable is connected, the shield connection electrode, the base material, and the conductor connection electrode are bared in a stepwise fashion.