Inductive Position Indicator Switch Layout for Sealed Miniaturization
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Solution Overview
Problem
Existing position indicators with a side switch mechanism face challenges in miniaturization due to the need for an opening on the housing, which compromises strength and waterproofing, and complicates manufacturing.
Innovation Solution
A position indicator design where a second coil outside the cartridge is magnetically coupled to a first coil within the cartridge, with a switch operated externally, forming a closed circuit when activated, allowing independent operation without an external opening on the cartridge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an opening is provided on the housing for the side switch operation portion, then the side switch can be operated from the outside, but the housing strength and waterproofing are compromised
Solution Approach 1:
The side switch operation portion is extracted from the cartridge and relocated to the housing. The cartridge maintains its sealed structure without openings, while the housing provides the operation interface. This separation allows the cartridge to maintain waterproofing and structural integrity while still enabling external operation of the side switch through the housing's operation portion.
2Ease of operation
If an opening is provided on the housing for the side switch operation portion, then the side switch can be operated from the outside, but waterproofing is compromised
Solution Approach 1:
The operation portion is extracted from the cartridge and placed in the housing. This allows the cartridge to remain completely sealed and waterproof, while the housing provides a protected interface for operation. The housing's operation portion can be designed with appropriate sealing structures to maintain waterproofing while enabling operation.
3Device complexity
If the side switch and operation portion are integrated on the cartridge, then the structure is compact, but manufacturing complexity increases due to the need for external openings and alignment
Solution Approach 1:
The side switch system is segmented into two separate components: the cartridge contains only the side switch, while the housing contains the operation portion. This segmentation simplifies manufacturing by eliminating the need for precise alignment between components and allowing independent production and assembly of simpler sub-assemblies.
Solution Approach 2:
The operation portion is extracted from the cartridge and relocated to the housing. This extraction eliminates the need for openings in the cartridge and simplifies both the cartridge structure and the manufacturing process. The housing can be manufactured with the operation portion integrated, reducing overall assembly complexity.
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 miniaturization and waterproofing while simplifying manufacturing by eliminating the need for an external switch mechanism on the cartridge, maintaining functionality without compromising strength or ease of use.
Implementation Method 1
a second coil (9) that is independent of the position indicator cartridge is provided outside the position indicator cartridge, at a position where the second coil (9), in operation, is magnetically coupled to the first coil (31) of the position indicator cartridge
Data Source
AI summary
A position indicator of an electromagnetic induction type. The position indicator includes a first resonant circuit, a second coil, and a switch. The first resonant circuit includes a first capacitor and a first coil wound around a magnetic core arranged on one end of the position indicator in an axial direction of the position indicator. The second coil is independent of first coil, at a position where the second coil, in operation, is magnetically coupled to the first coil. The switch is connected electrically to the second coil. A closed circuit including the second coil is formed when the switch is turned on.