Multi-Track Encoder With Segmented Light-Receiving Arrays
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Solution Overview
Problem
Existing encoders face challenges in accurately detecting position and velocity due to irregular reflections from uneven disk surfaces and noise interference, which affects the reliability and accuracy of position data generation.
Innovation Solution
The encoder design incorporates multiple slit tracks with different pitch incremental patterns and corresponding light-receiving arrays, along with a point light source, to enhance detection accuracy and noise resistance by optimizing the placement of light-receiving arrays relative to the light source and disk surface, allowing for high-resolution position data generation through signal stacking and improved robustness against mechanical displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single light-receiving array is used to detect position, then the device complexity is low, but the measurement precision and reliability are insufficient due to noise interference and irregular reflections
Solution Approach 1:
The encoder divides the detection function into multiple segments: multiple slit tracks with different pitch patterns (first, second, third patterns) and multiple corresponding light-receiving arrays (first, second, third arrays). Each segment detects specific position information independently, and their results are combined to achieve high-precision position detection that overcomes noise and reflection issues
Solution Approach 2:
The invention adds dimensional complexity by introducing multiple pitch patterns (different spatial frequencies) and multiple detection arrays. This multi-dimensional approach allows the system to distinguish between actual position changes and noise artifacts, improving measurement precision through dimensional differentiation
2Reliability
If multiple light-receiving arrays with different pitch patterns are used, then the reliability and noise resistance improve, but the device complexity increases
Solution Approach 1:
The detection system is segmented into multiple specialized arrays: the first light-receiving array detects the first pitch pattern, the second array detects the second pitch pattern, and the third array detects the third pitch pattern. This segmentation allows each array to be optimized for its specific pattern, improving reliability through specialized detection
Solution Approach 2:
The system changes detection parameters by using multiple pitch patterns (different spatial frequencies) and combining their detection results. This parameter diversification improves reliability because different patterns respond differently to noise and reflections, allowing the system to identify and eliminate erroneous signals
3Measurement precision
If the light-receiving arrays are positioned close to the light source, then the measurement precision improves, but the robustness against mechanical displacement decreases
Solution Approach 1:
The system segments the detection function across multiple arrays positioned at different locations. The first array is positioned for optimal precision, while the second and third arrays provide additional detection points that are less sensitive to displacement, creating a segmented detection system that balances precision and stability
Solution Approach 2:
The detection system acts as a composite structure combining multiple detection arrays with different positioning characteristics. By compositeing the detection results from arrays at different positions and with different pitch patterns, the system achieves both high precision and robustness against mechanical displacement
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 configuration improves the accuracy and reliability of position data detection by reducing noise interference and enhancing the robustness of the encoder system, even in the presence of irregular reflections and mechanical eccentricities.
Implementation Method 1
The first light-receiving array is configured to receive light reflected by the slit track comprising an incremental pattern
Implementation Method 2
The point light source is configured to emit diffusion light to the plurality of slit tracks
Data Source
AI summary
An encoder includes a plurality of slit tracks, a point light source, a first light-receiving array, a second light-receiving array, and a third light-receiving array. The plurality of slit tracks respectively comprises a plurality of reflection slits arranged along a measurement direction. The point light source is configured to emit diffusion light to the plurality of slit tracks. The first light-receiving array is configured to receive light reflected by the slit track comprising an incremental pattern. The second light-receiving array is configured to receive light reflected by the slit track comprising an incremental pattern longer in pitch than other incremental patterns. The third light-receiving array is configured to receive light reflected by the slit track comprising an absolute pattern.