Optical Encoder Mounting Layout for Stable Detector Alignment
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Solution Overview
Problem
Conventional encoders experience unstable detector states due to uneven stress distribution, leading to degraded detection accuracy.
Innovation Solution
The encoder design includes a rotating plate with an optical module positioned on a line segment connecting the centers of mounting holes on a substrate, which is fixed to a frame using screws, ensuring uniform stress distribution and stabilizing the optical module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the detector is fixed to the main body using conventional fixing methods, then the encoder structure is simple, but the stress distribution becomes uneven causing the detector to be held in an unstable state
Solution Approach 1:
The patent positions the optical module asymmetrically on the substrate, specifically placing it on a line segment connecting the centers of the first and second mounting holes rather than at the center of the substrate. This asymmetric positioning ensures that the optical module is located in a region where stress from the four corner mounting holes distributes more uniformly, preventing tilting and improving detection accuracy while maintaining a relatively simple encoder structure
2Device complexity
If the optical module is positioned at the center of the substrate, then the encoder structure is symmetric and simple, but the stress from mounting holes acts unevenly on the optical module causing tilting
Solution Approach 1:
The patent deliberately positions the optical module asymmetrically on the substrate, specifically on a line segment connecting the centers of the first and second mounting holes. This asymmetric positioning moves the optical module away from the center region where stress concentrates, to a region where stress from the four corner mounting holes distributes more uniformly, thereby preventing tilting and improving detection accuracy
3Device complexity
If the detector is held in a tilted state due to uneven stress, then the fixing structure is simple, but the detection accuracy is degraded
Solution Approach 1:
The patent positions the optical module asymmetrically on the substrate, specifically placing it on a line segment connecting the centers of the first and second mounting holes. This positioning ensures the optical module is located in a region where stress from the four corner mounting holes distributes more uniformly, preventing tilting and degraded detection accuracy while maintaining a simple fixing structure with only four mounting holes
Solution Approach 2:
The patent identifies the specific region on the substrate where stress distribution is more uniform (along the line segment connecting centers of mounting holes) and positions the optical module in that specific location. This local quality approach ensures the optical module receives uniform stress support from the mounting holes, preventing tilting and improving detection accuracy
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 configuration stabilizes the optical module, preventing tilting and maintaining detection accuracy by ensuring uniform stress distribution, thus enhancing the encoder's performance.
Implementation Method 1
an optical module including at least one of a light source that emits a light to the rotating plate and a light receiving element that receives the light reflected by the rotating plate
Implementation Method 2
a light receiving element that receives the light reflected by the rotating plate or the light transmitted through the rotating plate
Data Source
AI summary
An optical module is held stably. A disclosed encoder includes a rotating plate that rotates about a rotation axis, optical module including at least one of a light source that emits a light to the rotating plate and a light receiving element that receives the light reflected by the rotating plate or the light transmitted through the rotating plate, substrate on which optical module is disposed, and a frame that supports the substrate. Substrate has first mounting hole and second mounting hole, and is screwed to the frame by a first screw inserted in first mounting hole and a second screw inserted in second mounting hole. In a view in a direction along the rotation axis, optical module is disposed on first line segment connecting the center of first mounting hole and the center of second mounting hole.