Pen Mouse Rotatable Actuator for Accurate Coordinate Output
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Solution Overview
Problem
Conventional optical pen mice fail to accurately output coordinates due to varying inclination angles caused by user handling, leading to inconsistencies between drawn lines and digital images, which cannot be effectively corrected by hardware calibration.
Innovation Solution
A pen mouse design featuring a rotatable actuator with an optical sensor and processor that detects surface reflections to compute rotating direction, angle, and depth variation, allowing for accurate coordinate generation and trace width adjustment, eliminating the need for pressure sensors by using a resilient component to recover the roller and store preset trace information for biological identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the optical navigation chip is disposed obliquely inside the pen tip to compensate for inclination angle, then the drawing line consistency is improved, but the handwriting deviation cannot be effectively overcome due to varying user handling angles
Solution Approach 1:
The patent uses a movable roller that can dynamically adjust its position and orientation in response to external pressure and pen shifting. The roller moves along the longitudinal direction under pressure and along the horizontal direction when the pen shifts, allowing the system to adapt to varying user handling angles rather than relying on a fixed oblique configuration
Solution Approach 2:
The patent replaces the conventional fixed oblique optical navigation chip with a mechanical system consisting of a movable roller and optical sensor. This mechanical system physically adapts to handling variations through the roller's movement, substituting the need for fixed hardware calibration with a dynamic mechanical response
2Ease of manufacture
If a fixed oblique configuration of the optical navigation chip is used, then hardware calibration is simplified, but the system cannot adapt to different palm sizes, posture habits and writing environments
Solution Approach 1:
The movable roller automatically adjusts its position and orientation in response to external pressure and pen shifting during use. The system serves itself by physically adapting to handling variations through the roller's inherent movement capabilities, eliminating the need for complex hardware calibration for different users
Solution Approach 2:
The patent changes the operational parameters of the optical detection system by introducing a movable roller that alters its position and orientation based on handling conditions. This dynamic parameter adjustment allows the system to adapt to different palm sizes, posture habits, and writing environments without requiring manual calibration
3Ease of operation
If the pen mouse is inclined during handling, then natural writing operation is enabled, but the drawn line becomes oblique relative to the digital line on screen
Solution Approach 1:
The movable roller dynamically responds to pen inclination by moving to a new equilibrium position that accounts for the handling angle. This dynamic adjustment allows natural writing operation with inclined pen mouse while maintaining accurate coordinate output, as the roller's position change compensates for the inclination
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 accurate coordinate output and easy handling by transforming rotatable actuator parameters into pen mouse traces, ensuring consistent line representation on digital images regardless of user handling, and providing pressure detection without additional sensors.
Implementation Method 1
The optical sensor is adapted to detect surface reflection of the rotatable actuator
Implementation Method 2
the roller is moved from the second position to the first position by a recovering force of the resilient component
Data Source
AI summary
A pen mouse includes a housing, a rotatable actuator, an optical sensor and a processor. The rotatable actuator is movably disposed inside the housing along a structurally longitudinal direction and a structurally horizontal direction of the housing. The optical sensor is adapted to detect surface reflection of the rotatable actuator. The processor is electrically connected with the optical sensor and adapted to compute a rotating direction, a rotating angle and depth variation of the rotatable actuator via analysis of the surface reflection.