Proximity Sensor Shield with Segmented Side Pieces
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Solution Overview
Problem
In proximity sensors, the cylindrical shield part wound around the core experiences positional displacement due to the reaction force of the resin during assembly, exposing parts of the circumferential surface and allowing noise to enter the detection part.
Innovation Solution
A proximity sensor design featuring a detection part shield with a first face part adhering to the front surface and a side face part composed of multiple side pieces connected to the outer periphery, bent to cover the side surface, inhibiting positional displacement and providing electrical connection between the detection part and substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cylindrical shield part is wound around the core and connected to a plate-shaped shield part at one place, then the structure is simple and easy to manufacture, but positional displacement occurs due to resin reaction force during assembly, exposing parts of the core and allowing noise to enter
Solution Approach 1:
The shield member is divided into multiple side pieces (first side piece, second side piece, third side piece, fourth side piece) that are connected to the first face part at different positions around the circumferential direction. This segmentation allows each side piece to independently support the shield structure, preventing positional displacement while maintaining manufacturing simplicity.
Solution Approach 2:
The shield member integrates multiple functions: noise shielding, structural support, and electrical connection. The side pieces are electrically connected to the first face part and extend to cover the side surface, combining the shielding function with structural stabilization and electrical connectivity in a single integrated component.
2Reliability
If the shield member is pushed into resin during assembly, then the components are sealed in the housing, but the reaction force from the resin causes positional displacement of the shield member
Solution Approach 1:
The shield member is designed with multiple side pieces connected to the first face part at different circumferential positions before assembly. This preliminary structural configuration provides inherent resistance to resin reaction forces during the pushing-in process, preventing positional displacement and maintaining positioning accuracy while achieving effective sealing.
3Reliability
If the side face part is configured with multiple side pieces connected to the outer periphery of the first face part, then positional displacement is inhibited and noise prevention is effective, but the structure becomes more complex
Solution Approach 1:
The side pieces serve multiple functions simultaneously: they provide structural support to prevent positional displacement, maintain the shielding coverage over the side surface, and provide electrical connection paths. This multi-functionality reduces the need for separate components, thereby limiting the increase in overall structural complexity while achieving improved stability.
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 design effectively prevents positional displacement of the shield member, ensuring effective noise prevention and stable assembly by using a side face part configured with multiple side pieces to balance and securely cover the detection part's periphery.
Implementation Method 1
a first face part that adheres to a front surface located on the other end side of the detection part
Implementation Method 2
a resin which is provided around the detection part and the detection part shield
Data Source
AI summary
This proximity sensor includes: a cylindrical housing having an opening at one end in the axial direction; a detection part housed at the other end of the housing and detecting the presence or absence of a detection target contactlessly; a substrate housed in the housing and mounted with a control circuit for controlling the detection part; a detection part shield preventing external noise from entering the detection part and including a first face part adhered to the front surface on the other side of the detection part, and a side face part configured from multiple side pieces connected to the outer periphery of the first face part and bent from the first face part to cover the side surface of the detection part; and a resin provided around the detection part and the detection part shield.