Electronic Pen Evaluation via Planar Sensor Coordinate Alignment
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Solution Overview
Problem
Existing methods for evaluating electronic pens require complex system configurations to align machine and sensor coordinate systems, complicating the process of position adjustment.
Innovation Solution
A simplified system configuration for aligning machine and sensor coordinate systems using a planar sensor and a rotation mechanism to adjust the orientation and position of an electronic pen, allowing for efficient alignment through angle and position adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a robot movement mechanism is used to grasp and move the electronic pen for automated evaluation, then automation of evaluation is improved, but the system configuration becomes complex due to the need for position adjustment between machine coordinate system and sensor coordinate system
Solution Approach 1:
The patent transforms the complex three-dimensional position adjustment problem into a simpler two-dimensional angle adjustment problem. By defining the planar sensor's normal direction as the Z-axis and aligning it with the machine coordinate system's third axis, the patent reduces the coordination complexity from full 3D position matching to primarily angular orientation matching, thereby simplifying the overall system configuration while maintaining automation.
Solution Approach 2:
The patent changes the coordinate system parameters by defining the planar sensor's normal direction as the Z-axis and establishing specific relationships between the sensor coordinate system (X-Y plane) and machine coordinate system. This parameter redefinition simplifies the transformation equations and reduces the number of adjustment parameters needed, making the system easier to configure while preserving automated evaluation capabilities.
2Measurement precision
If position adjustment is performed to align machine coordinate system with sensor coordinate system, then measurement precision is improved, but the adjustment process becomes complex
Solution Approach 1:
The patent simplifies the position adjustment process by reducing it from a complex three-dimensional coordinate transformation to a simpler angular adjustment around the Z-axis. By establishing that the planar sensor's normal direction aligns with the machine's Z-axis, the patent eliminates the need for complex Z-position and X-Y orientation adjustments, thereby improving measurement precision while reducing adjustment process complexity.
Solution Approach 2:
The patent segments the coordinate alignment process into distinct components: angle adjustment (rotating the planar sensor around the normal axis) and position adjustment (shifting the origin point). This segmentation allows each component to be adjusted and calibrated independently, simplifying the overall adjustment process while ensuring high measurement precision through systematic calibration of each parameter separately.
Data Source
AI summary
Provided is an evaluation method for an electronic pen by an evaluation system including a planar sensor and a movement mechanism, the evaluation method including disposing the planar sensor such that a direction of a third axis orthogonal to each of a first axis and a second axis in a three-dimensional machine coordinate system defined for controlling driving of the movement mechanism is orthogonal to a sensor coordinate plane formed by a first axis and a second axis of a two-dimensional sensor coordinate system defined in the planar sensor, performing angle adjustment by causing an orientation of a machine coordinate plane to correspond with an orientation of the sensor coordinate plane by rotating the planar sensor disposed, with a direction normal to the planar sensor being an axis of rotation, and performing position adjustment by causing a sensor reference point to correspond with a machine reference point.