Pen-Stylus Shock Absorption for Force Sensor Protection
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Solution Overview
Problem
Conventional pen-styluses face issues with durability and safety, particularly when subjected to excessive forces, which can compromise their performance and reduce their service life.
Innovation Solution
The pen-stylus incorporates safety features such as a writing shaft impact shock absorber, a deformable marker tip, a writing shaft safety stop, a writing shaft bottom bracket, and an eraser shaft impact shock absorber to absorb and mitigate excessive forces, enhancing durability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pen-stylus uses a rigid structure to maintain precision, then writing precision is improved, but durability under excessive force deteriorates
Solution Approach 1:
The patent incorporates shock absorbers at critical points (tip and eraser end) to cushion impact forces before they can damage the force sensor or internal components. This preliminary cushioning allows the pen to maintain a rigid writing structure while protecting against drops and excessive forces that would otherwise compromise durability.
Solution Approach 2:
The pen-stylus is divided into distinct functional segments: a rigid writing shaft for precision, a deformable marker tip for impact absorption, and separate shock absorber components. This segmentation allows the writing portion to remain rigid for precision while other segments handle shock absorption, resolving the contradiction between rigidity and durability.
2Reliability
If the pen-stylus uses a deformable marker tip to absorb impact, then durability is improved, but writing precision may deteriorate
Solution Approach 1:
The marker tip is separated from the writing shaft, allowing the tip to deform and absorb impact while the writing shaft maintains its rigid structure for precision. The tip acts as a sacrificial element that protects the critical force sensing components without compromising the writing precision of the shaft.
Solution Approach 2:
Different parts of the pen have different mechanical properties: the marker tip is designed to be deformable for shock absorption, while the writing shaft remains rigid for precision. This local differentiation of material properties allows each component to optimize its function without compromising the other.
3Reliability
If the pen-stylus adds multiple safety features (shock absorbers, safety stops, brackets), then durability is improved, but device complexity increases
Solution Approach 1:
Shock absorbers are strategically placed at the tip and eraser end where impact forces first occur. This targeted approach provides maximum protection with minimal additional complexity, as the cushioning elements are positioned at the extremities rather than requiring complex internal reinforcement throughout the entire structure.
Solution Approach 2:
The marker tip is designed as a replaceable, sacrificial component that absorbs impact and can be replaced when worn or damaged. This disposable element protects the more expensive and complex internal components (force sensor, electronics) from damage, extending the service life of the pen without requiring complex protection for all components.
4Measurement precision
If the pen-stylus uses a force sensor to detect pressure, then force sensitivity is improved, but vulnerability to damage from excessive force increases
Solution Approach 1:
Shock absorbers are positioned between the external environment and the force sensor to cushion excessive forces before they reach the sensitive sensor. This allows the sensor to accurately detect normal writing pressures while being protected from damage by drops or excessive forces that would otherwise exceed its measurement range or cause physical damage.
Solution Approach 2:
The shock absorbers and deformable tip act as intermediary elements between the external impact forces and the force sensor. These intermediaries absorb and attenuate excessive forces, allowing the sensor to function within its optimal range while protecting it from damaging forces that would compromise reliability.
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
These safety features extend the service life of the pen-stylus by protecting it from damage due to accidental drops or excessive force, ensuring consistent performance and precision in operations.
Implementation Method 1
a writing shaft impact shock absorber that receives excess forces imparted to the pen-stylus to shield the force sensor from receiving such excess forces
Implementation Method 2
a marker tip that receives excess forces and deforms its shape in absorbing the excess forces
Implementation Method 3
a force sensor that translates mechanical input forces received from the writing shaft into electrical ones for operation by electronics in the pen-stylus
Data Source
AI summary
Embodiments of the invention provide a plurality of safety features for a pen-stylus. The pen-stylus may comprise a writing shaft that receives mechanical input forces as a user engages the pen-stylus on a display of a tablet device, a force sensor that translates mechanical input forces received from the writing shaft into electrical ones for operation by electronics in the pen-stylus; and a writing shaft impact shock absorber that receives heavy forces imparted to the pen-stylus to shield the force sensor from receiving such heavy forces. The heavy forces impacting the pen-stylus may arise from the pen-stylus being dropped onto a hard surface.