Capacitive Stylus Pen Head with Universal Joint for Arbitrary Angle Use
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Solution Overview
Problem
Conventional capacitive touch-screen stylus pens have a flat or inclined pen head that makes them inconvenient to use, requiring a specific angle and applying the right force for effective contact, which can lead to difficulties in maneuverability and increased risk of loss.
Innovation Solution
A pen head configuration with a universal joint connecting a conductive pen head and support saddle, featuring a spherical connection that allows for arbitrary angle use and maintains the largest touching area, integrated with a roller pen body for easy carrying and reduced loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pen head has a flat end face, then the stylus can touch the touchscreen, but the user must hold the pen at a right angle which is inconvenient for users not familiar with the stylus pen
Solution Approach 1:
The patent applies spheroidality by replacing the flat end face with a spherical head. This spherical shape allows the stylus to touch the touchscreen at any angle while maintaining a consistent contact point, eliminating the need for users to hold the pen at a specific angle and making it intuitive for all users regardless of familiarity.
Solution Approach 2:
The patent implements dynamics by making the pen head adjustable and flexible rather than fixed. The spherical head can dynamically adapt to different holding angles and positions, allowing the stylus to maintain proper contact with the touchscreen regardless of how the user holds it, thereby improving ease of operation.
2Ease of operation
If the pen head has an inclined guide face, then the stylus can be used at a certain angle, but it becomes laborious to move the pen head on the screen when the direction is changed
Solution Approach 1:
The spherical head design replaces the inclined guide face, allowing the stylus to smoothly transition between different writing directions without creating resistance or requiring deliberate repositioning. The curved surface naturally guides the motion in any direction, making it effortless to change writing orientation.
Solution Approach 2:
The spherical head serves multiple functions: it maintains consistent contact with the touchscreen, allows writing in any direction, and eliminates the need for directional guidance features. This universal design works for all writing orientations without requiring separate mechanisms for different directions.
3Ease of operation
If the pen head has an inclined guide face, then the stylus is flexible to move on the screen, but if the applied force is too less the contact area is too small and if the applied force is too great the contact area is larger making it difficult to move the pen head
Solution Approach 1:
The spherical head concentrates the contact force to a specific point on the touchscreen, providing sufficient contact area for capacitive sensing without requiring excessive force from the user. This geometry naturally optimizes the force distribution, eliminating the need to apply great force while maintaining adequate contact.
Solution Approach 2:
The patent changes the geometric parameters of the pen head from flat or inclined surfaces to a spherical shape with specific radius. This parameter change optimizes the contact characteristics, providing the right balance between contact area and required force, making the stylus responsive without requiring heavy pressure.
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 users to hold and operate the stylus pen at any angle while ensuring maximum contact area with the touchscreen, enhancing usability and reducing the likelihood of loss due to its integrated design with a roller pen.
Implementation Method 1
The pen head and the support saddle are connected through a universal joint
Implementation Method 2
The support saddle has a spherical socket with a reduced opening at a lower end thereof to accommodate an upper part of the spherical head of the connecting portion. The spherical head cooperates with the spherical socket to form the universal joint.
Data Source
AI summary
A pen head configuration structure for a capacitive touch-screen stylus pen is disclosed, and it includes a pen head and a support saddle for the pen head which are made of conductive materials, and a universal joint is connected between the pen head and the support saddle for the pen head. When the stylus pen is used in practice, the pen body can be used at arbitrary angle through using the connection relationship of the universal joint. However the largest touching area between the pen head and the touching-screen can be kept, so as to ensure the operation performance of the stylus pen.