Electromagnetic Position Indicator With Sealed Side Switch
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Solution Overview
Problem
The existing position indicators with a side switch mechanism face issues of reduced strength and difficulty in achieving waterproofing due to the need for an opening on the housing, complicating the configuration and manufacturing process.
Innovation Solution
A position indicator design where the side switch is provided externally, with a second coil magnetically coupled to the internal first coil, forming a closed circuit when activated, allowing operation without mechanical interaction with the position indicator 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, but the strength of the housing is reduced and waterproofing becomes difficult
Solution Approach 1:
The patent replaces the mechanical side switch operation mechanism with an electromagnetic induction system. A coil is wound around the magnetic core in the position indicator cartridge, and another coil is provided in the housing. When the operation portion is pressed, it changes the magnetic coupling between the coils, which is detected by the position detection device, eliminating the need for a physical opening in the housing.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the operation portion and the detection system. The magnetic core and coils mediate the interaction, allowing the operation signal to be transmitted through the housing material without requiring a physical opening, thus maintaining housing integrity and waterproofing.
2Ease of operation
If an opening is provided on the housing for the side switch operation portion, then the side switch can be operated, but the waterproofing of the position indicator is compromised
Solution Approach 1:
The mechanical side switch operation is replaced with an electromagnetic induction system that operates through magnetic coupling. This eliminates the need for openings in the housing, allowing the housing to be fully sealed for waterproofing while still enabling switch operation through magnetic field changes.
3Adaptability or versatility
If the side switch is integrated into the position indicator cartridge, then the resonant frequency can be changed, but the configuration becomes complicated and manufacturing becomes difficult
Solution Approach 1:
The patent divides the system into two separate parts: the position indicator cartridge containing the magnetic core and its coil, and the housing containing the operation portion and detection coil. This segmentation allows the resonant frequency control function to be achieved through magnetic coupling between the separated components, simplifying the overall configuration and manufacturing process.
4Volume of moving object
If the position indicator is miniaturized, then the portability is improved, but the space for accommodating the side switch mechanism is reduced
Solution Approach 1:
The bulky mechanical side switch mechanism is replaced with a compact electromagnetic induction system using magnetic cores and coils. This substitution dramatically reduces the space required for the switching mechanism, enabling miniaturization of the position indicator while maintaining the side switch functionality.
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 a functional side switch without compromising the cartridge's integrity, maintaining waterproofing and simplifying manufacturing, while allowing for easy replacement and operation.
Implementation Method 1
a second coil that is independent of the position indicator cartridge is provided outside the position indicator cartridge, at a position where the second coil, in operation, is magnetically coupled to the first coil of the position indicator cartridge
Data Source
AI summary
Provided is a position indicator of an electromagnetic induction type including a position indicator cartridge housed in a hollow portion of a housing, in which the position indicator cartridge includes a first resonant circuit including a first coil wound around a magnetic core arranged on one end of the position indicator cartridge in an axial direction of the position indicator cartridge and a first capacitor, a second coil that is independent of the position indicator cartridge provided outside of the position indicator cartridge, at a position where the second coil, in operation, is magnetically coupled to the first coil of the position indicator cartridge, and a switch turned on and off by an operation portion provided outside of the position indicator cartridge, the operation portion, in operation, receiving an operation of a user, and a closed circuit including the second coil is formed when the switch is turned on.