Absolute Encoder Circuit Board Parallelism Adjustment
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Solution Overview
Problem
Conventional absolute encoders face accuracy issues due to non-parallel mounting of the circuit board and the rotation disk, leading to reduced detection accuracy of the rotation amount.
Innovation Solution
The absolute encoder is designed with a circuit board fixed to pillars using locking sections, with adjustment portions to ensure the board's height is consistent across fixing points, maintaining parallelism with the rotation disk and enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the circuit board is fixed to pillars using locking sections, then the circuit board is securely mounted, but the detection surface of the light sensitive element and the surface of the rotation disk may not be parallel, reducing detection accuracy
Solution Approach 1:
The invention introduces adjustment portions at specific fixing portions of the circuit board to enable localized height adjustment. This allows different regions of the circuit board to have different adjustability characteristics, ensuring the detection surface is parallel to the rotation disk while maintaining secure mounting through the locking sections.
Solution Approach 2:
The adjustment portions enable changing the height parameter of the circuit board at specific fixing portions. By adjusting the height of the circuit board at the first fixing portion relative to the second fixing portion, the parallelism between the detection surface and rotation disk is achieved, thereby improving detection accuracy while maintaining mounting stability.
2Ease of manufacture
If the height of the circuit board is not uniform across fixing portions, then mounting is simpler, but the detection surface becomes non-parallel to the rotation disk, reducing measurement precision
Solution Approach 1:
The invention introduces adjustment portions at specific fixing portions of the circuit board to enable localized height adjustment. This allows different regions of the circuit board to have different adjustability characteristics, ensuring the detection surface is parallel to the rotation disk while maintaining secure mounting through the locking sections.
Solution Approach 2:
The adjustment portions are designed into the circuit board structure in advance, allowing for height adjustment during the mounting process. This preliminary design feature enables the detection surface to be made parallel to the rotation disk before final locking, combining mounting simplicity with measurement precision.
Data Source
AI summary
An absolute encoder includes a circuit board disposed away from a rotation shaft of a motor. The circuit board includes first fixing portions and a second fixing portion. At each of the first fixing portions, an adjustment portion is disposed between the circuit board and a top end portion of a given pillar is provided, the adjustment portion being set to adjust a distance between the circuit board and the top end portion of the given pillar, so that a height of the circuit board at each first fixing portion is set to be the same as a height of the circuit board at the second fixing portion. Each adjustment portion is a resist layer formed between a surface of the circuit board and a top end surface of a given first pillar.