Contactless Switch Replaceable Member Dust Sensitivity
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Solution Overview
Problem
Contactless ON/OFF switches face maintenance challenges due to decreased detection sensitivity from dust accumulation and the difficulty in replacing worn components, particularly when the rod member is placed vertically or when the cylindrical member becomes worn from repeated strains.
Innovation Solution
A contactless switch structure featuring a replaceable member with a flexible cylindrical design, a detachable rod member, and a detection element that moves parallel to a virtual boundary, allowing for easy replacement and minimizing dust-induced sensitivity loss, using a detection element and detector closely opposed across the virtual boundary without physical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the rod member is placed vertically to improve detection sensitivity, then detection sensitivity is improved, but dust accumulation on the mirror surface increases causing detection sensitivity to decrease
Solution Approach 1:
The patent inverts the detection approach by removing the mirror surface and dust-prone vertical rod configuration. Instead, it uses a lateral displacement detection method where the rod member moves horizontally parallel to the detector, eliminating the mirror surface that accumulates dust and allowing detection without vertical positioning that attracts dust from above.
Solution Approach 2:
The patent extracts and removes the mirror surface component that causes dust accumulation problems. By eliminating the mirror and using direct lateral displacement detection, the system removes the source of dust-related detection failures while maintaining sensitivity through the replaceable member's lateral movement.
2Ease of operation
If the cylindrical member is made flexible to allow tilting in arbitrary directions, then operability is improved, but the cylindrical member wears from repeated strains requiring replacement
Solution Approach 1:
The patent segments the switch into a fixed base member and a replaceable member containing the worn flexible cylindrical component. This allows the flexible cylindrical member to maintain its wear-resistant properties through periodic replacement while the permanent base member retains the detection mechanism, resolving the contradiction between operational flexibility and component durability.
Solution Approach 2:
The patent implements a discard-and-recover strategy for the flexible cylindrical member. When the flexible member wears from repeated strains, it can be easily replaced by removing the rod member, allowing the worn component to be discarded and a fresh one installed, maintaining reliability while preserving operability.
3Measurement precision
If the rod member protrudes from the cylindrical member to enable detection, then detection function is enabled, but replacement of the cylindrical member becomes difficult
Solution Approach 1:
The patent segments the assembly into a fixed base member with detector and a removable rod member with the flexible cylindrical member. This segmentation allows the rod member to protrude for detection while being independently removable, enabling easy replacement of the flexible cylindrical member without affecting the detection mechanism in the base member.
Solution Approach 2:
The patent extracts the rod member as a separate removable component from the base member. This allows the rod member containing the flexible cylindrical member to be easily taken out and replaced when worn, while the detection function remains intact in the permanent base member, resolving the contradiction between detection capability and replacement ease.
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
Enables easy replacement of worn components and maintains detection sensitivity by preventing dust accumulation, ensuring reliable contactless ON/OFF operations while allowing for various detection methods such as magnetic, light, or ultrasonic changes.
Implementation Method 1
detection element and detector closely opposed across the virtual boundary... detection element moves in an area on the replaceable member side of the virtual boundary
Implementation Method 2
cylindrical member having flexibility and stretchability and thus may be freely restored to the normal position
Data Source
AI summary
A contactless switch structure is provided that may turn on and off an electrical signal in a contactless manner, allow a worn operating portion in the structure to be easily replaced, and prevent decrease of the sensitivity caused by foreign material such as dust. A contactless switch structure according to the invention includes a replaceable member to be detachably set to a target portion to which the contactless switch structure is to be set, the replaceable member having an aperture at an end section thereof and a virtual boundary defined by the aperture at the end section; and a detection element and a detector closely opposed across the virtual boundary in the normal state, the detection element and the detector being placed on the replaceable member side and the target portion side of the virtual boundary, respectively.