Optical Navigation Device with Automatic Magnification Adjustment
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Solution Overview
Problem
Conventional optical navigation devices face accuracy issues due to dust accumulation on rollers and errors caused by medium flexion, which affect coordinate calculation and navigation precision.
Innovation Solution
An optical navigation device with an automatic magnification adjusting method, utilizing an illumination channel, a reference channel, and an imaging channel, where a reference feature with known parameters is used to calculate a compensating factor, allowing for precise adjustment of magnification to correct coordinate displacement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an optical sensing module is used to calculate coordinate variation, then navigation accuracy is improved, but errors occur due to medium flexion affecting the optical transmission path
Solution Approach 1:
The patent introduces a feedback mechanism by capturing reference images, detecting reference features, calculating magnification factors, and using these to compensate coordinate measurements. This closed-loop feedback system continuously corrects for medium flexion effects, maintaining reliable navigation accuracy despite optical path variations.
Solution Approach 2:
The patent uses reference features as intermediaries to measure medium flexion effects. These reference features serve as a mediator between the optical system and the medium, allowing the system to detect and compensate for transmission path variations without being directly affected by them.
2Device complexity
If a roller mechanism is used for navigation sensing, then device complexity is reduced, but dust accumulation on the roller decreases sensitivity and responsiveness
Solution Approach 1:
The patent replaces the mechanical roller system with an optical sensing module that uses light to detect coordinate variations. This substitution eliminates the dust accumulation problem inherent in mechanical rollers while maintaining the simplicity of the overall device structure through non-contact optical measurement.
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 solution effectively calibrates coordinate displacement to accurately represent cursor movement and real track, enhancing navigation accuracy and overcoming errors from medium-floating, thereby improving market competitiveness.
Implementation Method 1
Light is emitted from the optical transmitter to project onto the plane, and the optical receiver captures the light reflected from the plane
Implementation Method 2
The reference channel includes a reference light source and a reference optical component
Data Source
AI summary
An automatic magnification adjusting method is applied to an optical navigation device. The optical navigation device has an illumination channel, a reference channel and an imaging channel. The reference channel has a reference feature with a known parameter. The automatic magnification adjusting method includes driving the illumination channel and the reference channel to alternatively output a detecting image and a reference image, capturing a series of navigation images consisting of the detecting image and the reference image by the imaging channel, analyzing the reference image to recognize the reference feature, calculating a compensating factor according to a detected parameter of the reference feature, and adjusting magnification of the detecting image by the compensating factor to output corresponding coordinate displacement.