Optical Encoder Position Detection Using Surface Features
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Solution Overview
Problem
Conventional optical encoders require complex surface processing and specific markers for accurate position detection, limiting their application and increasing complexity.
Innovation Solution
An optical encoder system comprising a light emitter, a light sensing matrix, and a processing unit that emits light to a movable surface, detects reflected light, and generates comparison image data to determine current positions without the need for optical lenses, allowing for precise position identification and correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical encoding methods are used with markers and light sources arranged in specific ways, then accurate position detection can be achieved, but the working surface requires special processing and the application scope is limited
Solution Approach 1:
The detection surface itself serves as the encoding element through its inherent surface features (texture, reflectivity variations, geometric patterns) rather than requiring externally applied markers. The surface features naturally interact with the light to generate detectable signals, eliminating the need for special marker processing and enabling direct use of the working surface for encoding purposes
Solution Approach 2:
The system utilizes variations in surface parameters such as reflectivity, texture, and geometric characteristics of the detection surface to generate encoding information. By detecting changes in these surface parameters through optical interactions, the system achieves position detection without requiring specific markers, thereby expanding adaptability while maintaining precision
2Measurement precision
If special markers and complex surface processing are implemented for optical encoding, then accurate detection results can be obtained, but the processing complexity and difficulty of application increase
Solution Approach 1:
The invention extracts and utilizes the inherent surface features of the detection surface itself for encoding, removing the need for externally applied markers and complex surface processing. By taking out the encoding function from separate markers and integrating it into the natural surface characteristics, the system simplifies the overall structure while maintaining detection accuracy
Solution Approach 2:
Instead of requiring physical markers on the surface, the system creates an optical copy or representation of surface features through light reflection and detection. The light sensing matrix captures optical information from the surface, generating digital representations that can be processed for position detection, thereby eliminating the need for physical marker processing
3Measurement precision
If multiple light sources and complex optical arrangements are used for encoding, then position and velocity data can be generated, but the system complexity and number of components increase
Solution Approach 1:
The single light source and light sensing matrix are designed to perform multiple functions: generating illumination, detecting reflected light, capturing spatial information, and enabling position and velocity calculations. By making these components multi-functional, the system eliminates the need for separate dedicated components for each function, thereby reducing overall system complexity while maintaining measurement capabilities
Solution Approach 2:
The invention merges the functions of light emission, detection, and encoding into an integrated system where a single light source illuminates the surface and a light sensing matrix simultaneously performs detection and data generation. This consolidation of functions into fewer components reduces system complexity while maintaining the ability to generate accurate position and velocity data
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 and simplified position detection on various surfaces without the need for complex surface processing or specific markers, facilitating miniaturization and improved accuracy in position calculation.
Implementation Method 1
The light sensing matrix has a plurality of pixels and is configured to detect reflected light from the movable surface to generate detected signals
Data Source
AI summary
The present disclosure is related to an optical encoder which is configured to provide precise coding reference data by feature recognition technology. To apply the present disclosure, it is not necessary to provide particular dense patterns on a working surface. The precise coding reference data can be generated by detecting surface features of the working surface.