Electronic Pen Waterproof Sealing and Pressure Management
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Solution Overview
Problem
Existing electronic pens lack a suitable waterproof and pressure management solution for use with foldable terminals, where the display screen cannot accommodate a hard protective layer like strengthened glass, and existing waterproof techniques do not adequately prevent excessive writing pressure.
Innovation Solution
An electronic pen design featuring a tubular inside body with a first and second sealing member, providing a waterproof seal and allowing the pen main part and inside body to move together, along with a UV-bonded resin protective layer for the circuit board, and a coil spring mechanism to manage writing pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing waterproof techniques (sealing members, resin filling) are applied to the electronic pen, then the waterproof function is improved, but the ability to manage writing pressure for foldable terminals is insufficient
Solution Approach 1:
The electronic pen incorporates a dynamic pressure management mechanism where the core body can slide relative to the casing along the longitudinal direction. This sliding movement is enabled by elastic bodies (springs) that provide restoring force, allowing the pen to dynamically adjust and absorb excessive writing pressure when used on foldable terminals, while maintaining waterproof sealing through sealing members positioned at both ends of the sliding path.
2Adaptability or versatility
If the core body is allowed to slide to manage writing pressure, then suitability for foldable terminal is improved, but waterproof sealing becomes more difficult to maintain
Solution Approach 1:
The electronic pen is segmented into a casing and a movable core body, with sealing members positioned at both ends of the sliding path. This segmentation allows the core body to move independently for pressure management while the sealing members remain stationary relative to the casing, maintaining waterproof barriers at the interface between the movable and stationary parts.
Solution Approach 2:
Elastic bodies (springs) are introduced as intermediary elements between the core body and the casing. These springs provide the restoring force for the sliding mechanism while allowing controlled movement, and they are positioned to not interfere with the sealing members, thus enabling both pressure management and waterproof sealing to coexist.
3Strength
If a hard protective layer is added to the electronic pen, then writing pressure resistance is improved, but the risk of damaging foldable terminal screens increases
Solution Approach 1:
Instead of making the electronic pen harder to resist pressure, the design inverts the approach by making the pen softer and more compliant. The core body is allowed to slide and deform under pressure rather than resisting it rigidly, thereby protecting the foldable terminal screen from damage while still maintaining the pen's structural integrity through the elastic restoring force of the springs.
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 design effectively seals the pen's components from water and prevents excessive pressure on foldable terminal screens, ensuring both waterproof functionality and safe operation.
Implementation Method 1
a first sealing member that covers a circumference of tip side of the electronic pen main part and a second sealing member disposed along an outer edge of the electronic pen main part
Implementation Method 2
a coil spring mechanism to manage writing pressure
Data Source
AI summary
Provided is an electronic pen including an electronic pen main part including a first sealing member that covers circumference of a tip side of the electronic pen main part and a second sealing member disposed along an outer edge of the electronic pen main part at a position separate from a tip toward a rear end side of the electronic pen main part, and an inside body that is tubular and has an inner wall surface with which the first sealing member and the second sealing member come into contact through insertion of the tip side of the electronic pen main part into the inside body.