Miniaturized Mounting Cable With Bump Electrode Connection
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Solution Overview
Problem
Existing medical and industrial endoscopes face challenges in miniaturizing cables that transmit image signals and power due to the need for reduced diameters, which complicates the connection of coaxial cables to substrates, leading to potential short circuits and reduced connection strength.
Innovation Solution
A mounting cable design featuring a coaxial cable with exposed core wires and shields, connected to a conductor and cable fixing unit, which securely attaches to a substrate with a bump electrode, ensuring electrical and mechanical connection while maintaining positional accuracy and preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the diameter of coaxial cables is reduced to miniaturize endoscopes, then the size of the endoscope is reduced, but the connection strength between the cable and substrate deteriorates
Solution Approach 1:
The patent transitions from planar connection to three-dimensional connection by forming a bump electrode that protrudes from the substrate surface. This vertical dimension allows the cable to be secured at multiple heights, improving connection strength without increasing cable diameter. The bump electrode creates a stepped structure where the cable can be fixed both to the bump top and the substrate, providing mechanical reinforcement for miniaturized cables.
Solution Approach 2:
The connection structure is divided into multiple functional segments: the bump electrode segment for electrical connection, the cable fixing unit segment for mechanical securing, and the exposed core wire segment for terminal connection. This segmentation allows each component to be optimized independently, enabling strong connections in miniaturized cables without compromising overall endoscope size.
2Volume of moving object
If the diameter of coaxial cables is reduced to miniaturize endoscopes, then the size of the endoscope is reduced, but the positional accuracy during connection deteriorates
Solution Approach 1:
The bump electrode is formed on the substrate before cable attachment, establishing precise positional references in advance. The cable fixing unit is also prepared with predetermined structures that guide cable placement. These preliminary actions ensure that even miniaturized cables can be positioned accurately during assembly, maintaining manufacturing precision while reducing endoscope size.
Solution Approach 2:
The bump electrode acts as an intermediary structure between the substrate and the miniaturized cable. It provides a raised platform that improves visibility and accessibility during cable attachment, making it easier to position small cables accurately. The cable fixing unit serves as another intermediary that mechanically guides and secures the cable at the correct position, ensuring precise connection despite the reduced cable diameter.
3Reliability
If the connection area between cable and substrate is increased to prevent short circuits, then the reliability improves, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into integrated structures: the bump electrode simultaneously provides electrical connection, mechanical support, and positioning guidance. The cable fixing unit merges mechanical securing with electrical connection functions. This merging increases connection area for short circuit prevention while avoiding additional separate components, thus improving reliability without proportionally increasing device complexity.
Solution Approach 2:
The bump electrode and cable fixing unit are designed as multi-functional components. The bump electrode serves as both an electrical contact point and a mechanical anchor. The cable fixing unit provides both structural support and electrical connection. This multi-functionality allows the connection structure to prevent short circuits through increased connection area while maintaining relatively simple overall device architecture.
Data Source
AI summary
A mounting cable includes: a coaxial cable including: a core wire made of a conductive material; an internal insulator covering an outer periphery of the core wire; a shield covering an outer periphery of the internal insulator; and a jacket covering an outer periphery of the shield with an insulator, the coaxial cable having one end portion on which the core wire, the internal insulator and the shield are exposed; a cable fixing unit that fixes one end portion of the exposed core wire and has a connection surface on which an end face of the core wire is exposed; and a conductor having one end electrically and mechanically connected to the exposed shield and having the other end fixed to the cable fixing unit. An end portion of the conductor is exposed on the connection surface of the cable fixing unit.