Moving Object Detection Device Holder Case Assembly
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Solution Overview
Problem
Existing moving object detection devices face challenges in small-lot production efficiency, thermal shock resistance, and waterproof reliability due to complex resin molding processes and stress application to electronic parts, particularly in industrial machine tools and automobile engines.
Innovation Solution
A moving object detection device structure where a magnetic sensor element, permanent magnet, and board are held by a holder and case with concave-convex fitting, eliminating the need for resin sealing and using an elastic body for watertight sealing, reducing stress and improving thermal shock resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If resin molding is used to integrate holder and case, then manufacturing precision is improved, but device complexity increases and productivity decreases
Solution Approach 1:
The device is divided into separate holder and case components that can be manufactured independently and then assembled. This segmentation allows each part to be produced separately using standard manufacturing processes, improving productivity while maintaining integration precision through the fitting structure with convex and concave portions.
Solution Approach 2:
The holder is inserted into the case, creating a nested structure where one component fits within another. This nesting approach achieves integrated functionality without requiring complex resin molding, as the fitting structure with convex and concave portions ensures precise positioning and secure assembly.
2Reliability
If resin sealing is applied to seal the case opening, then waterproof reliability is improved, but thermal shock resistance deteriorates due to stress on electronic parts
Solution Approach 1:
The sealing resin that causes thermal stress is removed from the assembly process. Instead of using resin to seal the case opening, the patent employs an elastic body sealant that can accommodate thermal expansion and contraction without generating harmful stresses on electronic parts, while still providing waterproof sealing.
Solution Approach 2:
The sealing material is changed from rigid sealing resin to a flexible elastic body sealant. This parameter change in material properties allows the seal to adapt to thermal variations, maintaining waterproof reliability while eliminating thermal shock resistance problems caused by stress on electronic components.
3Device complexity
If board positioning is not secured, then device complexity is reduced, but manufacturing precision deteriorates due to board warping and bending
Solution Approach 1:
The board positioning function is merged with the case structure by forming convex and concave portions directly on the case. This integration provides secure board positioning without requiring separate positioning components, thereby maintaining manufacturing precision while avoiding increased device complexity.
Solution Approach 2:
The case is pre-formed with convex and concave portions that guide and position the board during assembly. This preliminary preparation of positioning features ensures accurate board placement and prevents warping and bending, achieving high manufacturing precision without complex positioning structures.
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
Simplifies assembly, increases production efficiency, reduces manufacturing costs, enhances thermal shock resistance, and improves waterproof reliability by eliminating resin stress and ensuring secure board positioning.
Implementation Method 1
a magnetic sensor element; a permanent magnet for applying a magnetic field to the magnetic sensor element
Implementation Method 2
an elastic body for watertight sealing
Data Source
AI summary
A moving object detection device has a magnetic sensor element, a permanent magnet for applying a magnetic field to the magnetic sensor element; a board on which electronic parts are mounted, a holder; and a case. The holder has an integral approximately box-shaped support part to hold the magnet and the board, and the holder is inserted into the case so that the magnetic sensor element, the permanent magnet, and the board are contained in the case. The holder and the case are fitted and fastened to each other by concave-convex-shaped elements.