Vernier Optical Encoder Digital Pulse Track for Bit Error Correction
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Solution Overview
Problem
Vernier-type optical encoders face challenges in correcting high-level bit errors due to noise sensitivity and require additional tracks, which increase the encoder's size and complexity.
Innovation Solution
A method is introduced to replace the segment track with a digital pulse signal track of lower height, using a light receiving device to detect digital pulse signals with cycles proportional to the master track, and generating additional digital opto-electrical pulse signals with phase differences to enhance noise tolerance and reduce encoder size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a segment track is added to correct high-level bit errors in Vernier-type encoders, then noise tolerance is improved, but the encoder size and complexity increase
Solution Approach 1:
The patent extracts the error correction function from the traditional segment track approach and implements it through digital pulse signal processing. By removing the need for additional analog segment tracks and using digital signal processing techniques, the patent reduces the physical encoder size while maintaining noise tolerance capabilities.
Solution Approach 2:
The patent replaces the mechanical/optical segment track structure with a digital signal processing system. Instead of using additional physical tracks to generate analog signals for error correction, the system uses digital pulse signals and processing circuits to achieve the same error correction function, thereby reducing the encoder's physical complexity.
2Reliability
If the height of the signal track is increased to ensure signal level over a certain value, then noise tolerance is improved, but the encoder design size increases
Solution Approach 1:
The patent replaces the analog signal track height adjustment approach with digital signal processing. Instead of increasing the physical track height to ensure adequate signal levels, the system uses digital pulse signals that maintain their amplitude regardless of track height, and employs processing circuits to ensure signal stability and noise tolerance.
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 approach reinforces high-level bit noise tolerance while minimizing the encoder's design, allowing for a smaller and more reliable Vernier-type absolute position encoder.
Implementation Method 1
a light receiving device having a light receiving unit array for detecting light of the light emitting unit, passing through the code disk
Data Source
AI summary
This disclosure relates to a method for detecting an absolute rotation angle of an optical rotary encoder, and more particularly, to an optical encoder having a signal track for generating a digital pulse which may correct an error when a high-level bit is generated in a Vernier type. The optical encoder according to an embodiment of the present disclosure includes a master track for generating a sinusoidal signal with the fastest cycle, a Vernier track for generating a sinusoidal signal with a cycle smaller than that of the master track by a predetermined value, and a digital track for generating a digital pulse signal with a cycle proportional to the cycle of the sinusoidal signal of the master track.