Capacitive Sensor Tail Routing with Separation Portion
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Solution Overview
Problem
The tail portion of electrostatic capacitance sensors can bend during assembly, leading to heavy loads on the bent areas, which may cause breakage of wiring lines due to contact with the film sheet.
Innovation Solution
A sensor design with a separation portion between the sensor sheet and the base member, allowing the tail portion to be easily bendable by forming a recess or using a heat-resistant resin member or notches, reducing the risk of breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the tail portion is disposed to project from a rigid compact, then the wiring lines can be freely routed, but the tail portion is bent at the boundary and heavy load is applied causing wiring line breakage
Solution Approach 1:
The base member is divided into a fixed portion (joint surface portion) and a non-fixed portion (separation portion). This segmentation allows the tail portion to be routed freely while preventing bending at the boundary, as the separation portion provides a dedicated non-restrained zone that accommodates the tail portion without imposing mechanical stress on the wiring lines.
Solution Approach 2:
The separation portion acts as an intermediary zone between the fixed base member and the tail portion. This intermediary structure allows the tail portion to transition smoothly from the constrained sensor main body area to the free routing area, eliminating the sharp boundary that causes bending and stress concentration on the wiring lines.
2Adaptability or versatility
If the tail portion is intentionally bent to match circuit board arrangement, then assembly compatibility is improved, but the bent portion experiences heavy load that may turn up wiring lines against the film sheet
Solution Approach 1:
By segmenting the base member into fixed and non-fixed portions, the invention creates a dedicated bending zone (separation portion) where the tail portion can be intentionally bent to match circuit board arrangements. This bending occurs in the non-restrained separation portion rather than at the boundary, distributing the mechanical load and preventing wiring line damage.
Solution Approach 2:
The invention changes the mechanical parameter (restraint state) of the base member in the separation portion, making it non-fixed and compliant. This parameter change allows the tail portion to be bent to the required angle for circuit board compatibility while the separation portion absorbs the mechanical stress, preventing it from transferring to the wiring lines.
3Stability of the object's composition
If the base member is made rigid to support the sensor main body, then structural stability is improved, but the tail portion cannot be easily bent without applying heavy load
Solution Approach 1:
The base member is segmented into a rigid fixed portion that supports the sensor main body and a flexible non-fixed separation portion that allows easy bending of the tail portion. This segmentation enables the coexistence of structural stability and operational flexibility within the same base member structure.
Solution Approach 2:
The invention applies different mechanical properties to different parts of the base member: the joint surface portion maintains high rigidity for stable sensor support, while the separation portion has reduced restraint to enable easy tail portion bending. This local differentiation of mechanical properties resolves the contradiction between overall stability and local flexibility.
Data Source
AI summary
A sensor includes a base member and a sensor sheet, and the sensor sheet includes a sensor main body including sensor electrodes and a tail portion that includes wiring lines electrically connected to the sensor electrodes and that projects and extends with respect to the base member. The base member includes a joint surface portion that is fixed to the sensor main body and a separation portion that is disposed at a position facing a tail support portion of the tail support portion to which the tail portion is connected and that is not fixed to the tail support portion.