Position Indicator Waterproof Sealing via Elastic Rod Housing
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Solution Overview
Problem
Conventional position indicators lack water and dust resistance, leading to potential damage from environmental factors due to the clearance between the rod and the case, which can compromise the resonant circuit and other internal components.
Innovation Solution
A position indicator design featuring a bar-like rod housed in a case with an elastic member that maintains tight contact between the rod and the case, preventing water and dust from entering and ensuring a waterproof and dustproof structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rod protrudes from the case opening to enable input operations, then the position indicator can perform pointing and writing functions, but water and dust can enter through the clearance between the rod and case
Solution Approach 1:
A waterproof cap is introduced as an intermediary component between the rod and the external environment. The cap fits tightly around the rod and extends beyond the case opening, creating a barrier that prevents water and dust from entering the clearance space while allowing the rod to move freely for input operations.
Solution Approach 2:
The waterproof cap is designed with a flexible structure that can accommodate the rod's movement while maintaining sealing contact. The cap's material and design allow it to conform to the rod's position changes during pointing and writing operations, ensuring continuous protection against water and dust infiltration.
2Adaptability or versatility
If a clearance is formed between the rod and case for rod insertion and movement, then the rod can be housed and operated, but the clearance allows water and dust to enter the case
Solution Approach 1:
The waterproof cap serves as a mediator that fills the protective function gap created by the necessary clearance. It allows the clearance to exist for rod operation while simultaneously preventing harmful factors from exploiting that same clearance to damage internal components.
Solution Approach 2:
The protection system is segmented into two functional zones: the clearance zone that allows rod movement and operation, and the waterproof cap zone that provides environmental protection. This segmentation enables both rod adaptability and reliability without compromise.
3Ease of operation
If the case has an opening for rod protrusion, then the position indicator can be used for input operations, but the resonant circuit and internal elements are exposed to water and dust
Solution Approach 1:
The waterproof cap acts as a protective intermediary positioned at the case opening, blocking water and dust from reaching the resonant circuit and internal elements while permitting the rod to extend through for input operations. The cap creates a sealed barrier at the vulnerability point without interfering with operational 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
The solution effectively prevents water and dust from entering the case, enabling the position indicator to be used in adverse environments without compromising its functionality.
Implementation Method 1
an elastic member attached to the case, the elastic member having a hole (i.e., an aperture), into which the rod is inserted, so that tight contact between the hole and the rod is maintained
Data Source
AI summary
A position indicator comprises a case having a housing portion and an opening; a rod with a substantially bar-like body and an end and housed in the housing portion such that the end of the rod protrudes outside the case through the opening; and a sealing member attached to the opening and having an aperture into which the rod is inserted such that a gap between the aperture and the rod is sealed. A position detecting system comprises a position detecting device having a plurality of superimposed coils, a processing unit; and a position indicator. When the indicator approaches the position detecting device, a signal is induced by one of the coils, and the processing unit determines a position of the indicator based on the signal and a coordinate of the coil that induced the signal.