Pen Stylus Ejection Mechanism One-Handed Access
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Solution Overview
Problem
Existing mechanisms for mounting and ejecting pens or styluses in portable computing devices often require two hands, are difficult for users with large fingers or reduced dexterity, and suffer from mechanical wear leading to pen ejection issues.
Innovation Solution
A pen/stylus apparatus with a chamber and holding element that retains the pen in a partially-ejected position, using a biasing element like a spring to facilitate easy ejection and secure reinsertion, allowing one-handed operation and reliable engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual ejection mechanisms are used (pushing one side to pop up the other), then the pen can be ejected, but two hands are required which limits usability for customers having only one hand
Solution Approach 1:
The biasing element automatically ejects the pen from the chamber without requiring manual intervention. The system serves itself by using the biasing element's stored energy to perform the ejection action, eliminating the need for user manipulation and enabling one-handed or even hands-free operation.
Solution Approach 2:
The biasing element is pre-loaded with energy during the insertion phase when the pen is placed into the chamber. This preliminary storage of energy allows the automatic ejection to occur without requiring additional user action at the time of retrieval, making the system ready for immediate one-handed operation.
2Ease of operation
If the pen is buried in the system and requires manual extraction by grabbing a tab, then the pen is securely retained, but users with large fingers or reduced dexterity find it difficult to access
Solution Approach 1:
The biasing element performs the extraction action automatically without requiring the user to manually grab or manipulate the pen. The system retrieves the pen itself through the automatic ejection mechanism, making it accessible to users regardless of hand size or dexterity while maintaining secure retention through the holding element and shaft engagement.
Solution Approach 2:
The biasing element acts as an intermediary between the pen and the user, mediating the extraction process. Instead of the user directly manipulating the pen, the biasing element facilitates the ejection by converting stored energy into mechanical motion that pushes the pen out, making the interaction indirect and accommodating to users with limited dexterity.
3Reliability
If manual holding mechanisms are used, then the pen can be retained, but the holding element wears down over time resulting in the pen falling out without the user wanting it to
Solution Approach 1:
The patent replaces the worn-prone manual holding mechanism with a spring-based biasing element that provides continuous elastic force. This substitution eliminates the wear issues associated with manual friction-based holding, as the spring mechanism maintains reliable retention through elastic deformation rather than mechanical friction that degrades over time.
Solution Approach 2:
The holding mechanism transitions from a static friction-based system to a dynamic elastic force system. By changing the retention parameter from friction (which wears down) to elastic force (which can be repeatedly applied without degradation), the system achieves both reliable pen retention and extended service life for the holding element.
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 easy, one-handed access and secure storage of the pen, reducing mechanical wear and improving usability for users with varying hand sizes and dexterity.
Implementation Method 1
a biasing element adjacent to the holding element, the biasing element configured to eject the holding element to a position corresponding to the partially-ejected position of the pen when the retainer is released from the shaft
Data Source
AI summary
Embodiments of a pen/stylus apparatus are disclosed. In one embodiment, among others, a pen/stylus apparatus comprises a chamber configured to receive a pen, a holding element having a shaft, the holding element configured to retain the pen in a partially-ejected position, a button having a retainer, the retainer configured to retain the shaft when the pen is completely-inserted in the chamber, and a biasing element adjacent to the holding element, the biasing element configured to eject the holding element to a position corresponding to the partially-ejected position of the pen when the retainer is released from the shaft.