Position Detection Encoder Offset Adjustment via Linear Pattern
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Solution Overview
Problem
Conventional position detection encoders require additional patterns and complex computations for error correction due to positional offsets, making the adjustment process cumbersome and costly.
Innovation Solution
A position detection encoder with a scale featuring a position detection pattern and a linear pattern, along with a position confirmation pattern including markers and auxiliary markers, allows for easy adjustment of the positional relationship between the scale and position detector, enabling detection of offsets without measuring the offset amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional correction patterns and special computations are added to correct detection errors, then detection accuracy is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The linear pattern serves dual purposes: it functions as a standard position detection pattern and simultaneously serves as a correction pattern for detecting positional offsets. By making the correction function universal with the detection function, the patent eliminates the need for separate correction patterns, thereby reducing device complexity while maintaining detection accuracy through the position confirmation pattern mechanism
2Measurement precision
If additional correction patterns are added to the scale, then detection accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The linear pattern is designed to serve both as a position detection pattern and as a correction pattern. This multi-functionality eliminates the need for separate correction patterns, reducing the total number of patterns that must be manufactured and aligned, thereby lowering manufacturing costs while maintaining detection accuracy
3Measurement precision
If conventional correction methods are used, then detection accuracy is improved, but the adjustment process becomes cumbersome
Solution Approach 1:
The position confirmation pattern enables the system to automatically detect and indicate positional offsets through the visual alignment of markers with the linear pattern. This self-indicating mechanism eliminates the need for complex external measurement tools and procedures, making the adjustment process simpler and more intuitive for operators
Data Source
AI summary
A position detection encoder includes a scale that has a position detection pattern and a linear pattern that is formed in a direction parallel to a length direction of the position detection pattern; and a position detector generating a position detection signal with a different value due to a displacement of the position detection pattern in the length direction. In the position detector, a position confirmation pattern is formed that includes two markers arranged at an interval equal to or less than an offset tolerance value for a positional relationship of the position detector and the scale in a width direction of the position detection pattern.