Optical Encoder Array Layout for Nth-Order Harmonic Suppression
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Solution Overview
Problem
Existing optical encoders face challenges in accurately suppressing higher-order harmonic components, which affect processing accuracy and are difficult to manufacture due to the geometric complexity of the photoelectric detection units.
Innovation Solution
A photoelectric detection device with a first-level detection array and second-level detection array configuration, where the coordinate difference between adjacent first-level detection arrays is adjusted to suppress specific harmonic components, and the device can be fabricated using a rectangle-to-fan-shape transformation for disc-shaped gratings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the geometric shape of photoelectric detection units is designed with curve segments to suppress higher-order harmonic components, then detection accuracy is improved, but manufacturing difficulty increases
Solution Approach 1:
The patent changes the geometric parameters of the photoelectric detection units by introducing specific coordinate differences (x×P/N+(t1×P)/(t2×N)) between adjacent detection arrays. This parameter adjustment allows suppression of Nth-order harmonic components while maintaining manufacturable geometric shapes, resolving the contradiction between detection accuracy and manufacturing ease.
Solution Approach 2:
The patent divides the photoelectric detection units into multiple first-level detection arrays that are further grouped into second-level detection arrays. This segmentation allows independent optimization of each array's position and configuration, enabling harmonic suppression through coordinated arrangement while keeping individual unit geometries simple and manufacturable.
2Reliability
If multiple photoelectric detection units are arranged to suppress higher-order harmonic components, then signal quality is improved, but device complexity increases
Solution Approach 1:
The patent segments the photoelectric detection units into hierarchical levels: first-level detection arrays containing individual photoelectric detection units, and second-level detection arrays grouping multiple first-level arrays. This segmentation enables systematic signal combination to suppress harmonic components while organizing complexity in a manageable hierarchical structure.
Solution Approach 2:
The patent introduces a new dimensional parameter - the coordinate difference between adjacent first-level detection arrays in different second-level arrays. This additional spatial dimension provides a new degree of freedom for harmonic suppression, allowing signal quality improvement without proportionally increasing device complexity.
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
The solution effectively suppresses harmonic components, improving detection accuracy while being easy to manufacture and adapt to different grating types.
Implementation Method 1
the photoelectric detection unit detects the optical signal and converts the optical signal into an electrical signal
Data Source
AI summary
The present invention relates to the field of photoelectric detection technology. It discloses a photoelectric detection device and an optical encoder. The photoelectric detection device includes: a plurality of first-level detection arrays, where each first-level detection array includes at least one photoelectric detection unit, and an electrical signal output by the at least one photoelectric detection unit included in one first-level detection array is used as a first-level electrical signal output by the first-level detection array; the plurality of first-level detection arrays are divided into a plurality of second-level detection arrays, and a coordinate difference between corresponding points of two adjacent first-level detection arrays belonging to a same second-level detection array is x×P/N+(t1×P)/(t2×N), and corresponding first-level electrical signals in the t2 first-level detection arrays which belong to the same second-level detection array are added together, so as to suppress an Nth-order harmonic component and harmonic components whose orders are integer multiples of N. The optical encoder includes the above photoelectric detection device. In the present invention, harmonic components can be effectively suppressed, and the photoelectric detection device is easy to design and manufacture