Adaptive Snapshot Capture for Position Encoder Readheads
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Solution Overview
Problem
Existing position encoder technologies that obtain snapshot images of scales to read markings face challenges in maintaining signal quality and accuracy at varying relative speeds between the readhead and scale, leading to potential blurring or distortion at high speeds and reduced signal strength.
Innovation Solution
A position encoder apparatus and method that adjusts the snapshot capture process by altering the readhead's feature capture duration and electromagnetic radiation emission duration based on the relative speed between the scale and readhead, optimizing snapshot quality and accuracy without user intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the snapshot capture process uses a fixed capture duration and EMR emission duration, then the device complexity is reduced, but the measurement precision deteriorates at varying speeds due to blurring at high speeds and insufficient signal at low speeds
Solution Approach 1:
The patent applies dynamics by making the snapshot capture process adjustable and adaptive. The readhead dynamically changes the capture duration and EMR emission duration based on the detected relative speed between the scale and readhead. This resolves the contradiction by allowing the system to optimize measurement precision for each speed condition without requiring multiple fixed-configuration devices.
Solution Approach 2:
The patent changes the parameters of the snapshot capture process (capture duration and EMR emission duration) based on detected speed conditions. At high speeds, the capture duration is reduced to prevent blurring; at low speeds, the duration is increased to improve signal strength. This parameter adaptation resolves the precision-complexity contradiction by using a single device that adjusts its operation rather than requiring multiple fixed-parameter devices.
2Reliability
If the snapshot capture duration is increased to improve signal strength, then the measurement reliability at low speeds is improved, but the snapshot quality deteriorates at high speeds due to blurring and distortion
Solution Approach 1:
The system dynamically adjusts the snapshot capture duration based on the detected relative speed. When the readhead detects high speed movement, it reduces the capture duration to freeze the image and prevent blurring. When detected speed is low, it increases the duration to accumulate more signal. This dynamic adjustment resolves the contradiction between reliability and snapshot quality across different operating conditions.
Solution Approach 2:
The patent changes the capture duration parameter adaptively based on speed detection. The readhead modifies this parameter in real-time to match operating conditions, ensuring optimal snapshot quality at each speed level while maintaining measurement reliability. This resolves the contradiction by using a single adjustable parameter rather than requiring different hardware configurations.
3Manufacturing precision
If the snapshot capture duration is decreased to prevent blurring at high speeds, then the snapshot quality is maintained, but the signal strength is reduced leading to less reliable position extraction
Solution Approach 1:
The system dynamically adapts the capture duration to the detected speed condition. At high speeds, it uses shorter durations to prevent blurring while maintaining quality. At low speeds, it extends the duration to gather sufficient signal strength. This dynamic behavior resolves the contradiction by matching the capture parameters to actual operating conditions rather than using a fixed setting.
Solution Approach 2:
The readhead changes the capture duration parameter based on detected relative speed. This parameter adaptation allows the system to optimize for snapshot quality at high speeds while ensuring sufficient signal accumulation at low speeds, thereby resolving the contradiction between quality and reliability across the full speed range.
4Measurement precision
If a fixed EMR emission duration is used, then the device complexity is reduced, but the signal-to-noise ratio deteriorates at varying speeds affecting position measurement accuracy
Solution Approach 1:
The patent applies dynamics by making the EMR emission duration adjustable based on detected speed. The readhead dynamically modifies the emission duration to match operating conditions, optimizing the signal-to-noise ratio at each speed level. This resolves the contradiction by using a single device with adaptive control rather than multiple fixed-configuration devices.
Solution Approach 2:
The system changes the EMR emission duration parameter adaptively based on speed detection. This parameter adjustment optimizes the signal-to-noise ratio for each operating condition, improving measurement accuracy without requiring complex multi-configuration hardware. The readhead autonomously manages this parameter change based on detected conditions.
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 adaptive approach enhances the efficiency and accuracy of position information extraction, ensuring clear snapshots at low speeds and acceptable signal strength at high speeds, improving overall position measurement reliability and efficiency.
Implementation Method 1
the duration that electromagnetic radiation ('EMR') is emitted by at least one electromagnetic radiation ('EMR') source during the snapshot capture process
Data Source
Figure 1~3a
Figure 3b~4
Figure 5
AI summary
A position encoder apparatus, comprising: a scale comprising a series of position features; and a readhead configured to read the series of position features via a snapshot capture process. The snapshot capture process is adaptable so as to compensate for the relative speed between the scale and readhead.