Variable Capacitor Position Pointer Durability via Elastic Biasing
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Solution Overview
Problem
Conventional variable capacitors used in writing pressure detection systems suffer from durability issues due to the lack of a reliable mechanism to maintain the initial state and prevent contact between the second electrode and the dielectric member, leading to potential sticking and degradation.
Innovation Solution
A variable capacitor design featuring a dielectric member with a conductive member biased by an elastic member to maintain spacing, ensuring the conductive member returns to its initial state and preventing contact, thus enhancing durability and responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a ring-shaped spacer is merely interposed between the second electrode and the dielectric member, then the device complexity is reduced, but the reliability deteriorates due to inability to surely maintain spacing and prevent contact
Solution Approach 1:
The patent introduces a positioning protrusion and positioning groove mechanism as an intermediary system between the second electrode and dielectric member. This mediator ensures reliable spacing maintenance by physically preventing contact, resolving the contradiction between simple structure and high reliability through a targeted additive element that only intervenes where needed.
Solution Approach 2:
The positioning protrusion and groove are pre-configured in the second electrode and dielectric member respectively, creating a preliminary mechanical constraint system. This preliminary action ensures that before any pressure application, the components are already positioned to maintain proper spacing, preventing contact in advance and improving durability without requiring complex active control mechanisms.
2Ease of manufacture
If the second electrode is disposed on the second face side of the dielectric member without a reliable spacing mechanism, then the ease of manufacture is improved, but the reliability deteriorates due to potential sticking and degradation
Solution Approach 1:
The positioning groove in the dielectric member serves as a passive intermediary structure that guides and constrains the second electrode during assembly and operation. This intermediary feature maintains spacing through simple geometric constraint rather than active mechanisms, preserving ease of manufacture while ensuring reliability through the groove's continuous presence.
Solution Approach 2:
The positioning protrusion and groove are integrated into the manufacturing processes of the second electrode and dielectric member respectively. This preliminary integration of spacing mechanisms during fabrication ensures proper positioning is built-in from the start, maintaining ease of assembly while preventing contact and sticking issues that would compromise durability.
3Measurement precision
If the conductive member is allowed to contact the dielectric member under pressure, then the measurement precision for pressure detection is improved, but the reliability deteriorates due to sticking and degradation
Solution Approach 1:
The positioning protrusion and groove create a preliminary mechanical constraint that prevents direct contact between the conductive member and dielectric member even under pressure. This preliminary action allows the conductive member to move freely for pressure detection while the positioning features ensure spacing is maintained, enabling accurate measurement without the harmful effects of contact and sticking.
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 improves the durability and responsiveness of the variable capacitor by ensuring the conductive member remains spaced from the dielectric member, preventing sticking and maintaining accurate pressure detection even under varying orientations and pressures.
Implementation Method 1
an elastic member coupled with the conductive member and adapted for biasing the conductive member away from the second face portion
Implementation Method 2
a variable capacitor having a capacitance value which varies in response to pressure applied thereto through the rod
Data Source
AI summary
A position pointer is provided, which includes a housing having an opening, a rod disposed in the housing such that one end thereof projects from the opening, and a variable capacitor having a capacitance value which varies in response to pressure applied thereto through the rod. The capacitor includes a dielectric member having a first face portion opposite a second face portion, a first electrode section disposed on the first face portion of the dielectric member, a conductive member facing the second face portion of the dielectric member and forming a second electrode section when brought into contact with the second face portion of the dielectric member, and an elastic member coupled with the conductive member and adapted for biasing the conductive member away from the second face portion. A contact area between the conductive member and the second face portion varies depending on the pressure applied through the rod.