Optical Navigation Calibration for Projection Distortion
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Solution Overview
Problem
Optical navigation systems, such as optical mice and pens, experience distortion in tracing due to the non-parallel alignment between the object plane and the image plane, leading to inaccurate cursor movement and power consumption issues.
Innovation Solution
A calibration method that involves moving the optical navigation system along a predetermined trace, sensing the projection trace, calculating a projection effect value based on the included angle between the reflected light and the object plane, and calibrating the projection trace to achieve a proportional calibration trace, thereby correcting the distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the image plane is not parallel to the object plane to improve light reception efficiency, then the optical signal intensity is improved, but the projection effect causes tracing distortion
Solution Approach 1:
The patent applies preliminary action by performing calibration before actual use. The system moves along a predetermined trace to detect the projection effect and calculate correction values in advance, so that the tracing distortion can be compensated during normal operation without affecting the non-parallel alignment configuration
Solution Approach 2:
The patent changes the parameter of the trace by transforming the predetermined trace into a calibrated trace using correction values. The calibration process modifies the trace parameters (coordinates, positions) to compensate for the projection effect, allowing the system to maintain the beneficial non-parallel alignment while achieving accurate tracing
2Ease of operation
If the object plane moves relative to the optical device to enable cursor control, then the operational functionality is improved, but the non-parallel alignment causes displacement distortion
Solution Approach 1:
The patent applies feedback by using the detected projection effect to generate correction values that are then applied to the trace calibration. The system continuously compensates for displacement distortion by comparing the predetermined trace with the actual projection trace and applying appropriate correction factors
3Illumination intensity
If the light emitting module increases power output to improve signal reception, then the optical signal intensity is improved, but the power consumption increases
Solution Approach 1:
The patent applies preliminary action by performing calibration before actual use. The calibration process detects the projection effect and calculates correction values in advance, enabling the system to operate with optimized power consumption during normal use while maintaining accurate tracing through pre-computed corrections
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
This method improves the precision of optical navigation systems by correcting the distortion caused by non-parallel alignment, ensuring accurate tracing and reducing power consumption.
Implementation Method 1
a light emitting module and a sensor, wherein the light emitted by the light emitting module is reflected to the sensor by an object plane
Implementation Method 2
The reflected light or the scattered light reflected from the object plane 20 are received by the sensor 12 in the direction of the reflected angle θr
Implementation Method 3
the sensor 12 will obtain better intensity of the optical signal
Data Source
AI summary
The present invention provides a calibration method of projection effect. The calibration method of projection effect according to the invention comprises the following steps. The first, step (a) is performed to make an optical navigation system move along a predetermined trace relative to an object plane. Then, step (b) is performed to sense the predetermined trace by a sensor to obtain a projection trace. The next, step (c) is performed to calculate a projection effect value according to the included angle between a reflected light and the object plane. Finally, step (d) is performed to calibrate the projection trace with the projection effect value to obtain a calibration trace which is in proportion to the predetermined trace.