Rotary Member Measurement Using an Inclined Reference Surface
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Solution Overview
Problem
Existing methods for measuring the rotational movement angle and perpendicularity/parallelism of rotary members are inaccurate, especially for gyro sensors and rotary encoders, and require large facilities, making them unsuitable for small spaces.
Innovation Solution
A measurement system using a rotary mechanism with a displacement meter and an inclined reference surface to measure distances at multiple scanning angles, allowing for precise determination of rotational movement angles and perpendicularity/parallelism based on phase differences in distance waveforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a gyro sensor is used to measure rotational movement angle, then the measurement can be performed directly at the measurement position, but the detection resolution is insufficient (on the order of 1/10°) and cannot achieve high precision (1/3600°)
Solution Approach 1:
The patent replaces the mechanical gyro sensor system with an optical measurement system. A light source projects light onto the rotary member, and a light receiving device detects the reflected light pattern. The shape and orientation of the light reflection pattern change with the rotary member's position, allowing precise angle measurement through optical detection rather than mechanical sensing, thereby achieving 1/3600° precision.
Solution Approach 2:
The patent changes the measurement parameter from direct angular displacement (measured by gyro sensors with limited resolution) to the shape and orientation characteristics of light reflection patterns. By analyzing how the light reflection pattern's geometry changes with rotary member position, the system achieves high-precision angle measurement through optical parameter variations rather than mechanical parameter changes.
2Measurement precision
If a rotary encoder is used to measure rotational movement angle, then high precision measurement is possible, but the scale plate cannot be disposed coaxially with the rotary member axis line and deformation occurs
Solution Approach 1:
The patent replaces the mechanical rotary encoder system with an optical measurement system. Instead of requiring a scale plate that must be coaxially aligned with the rotary member axis, the system uses light projection and detection to measure position. The light reflection pattern's shape and orientation provide measurement information without requiring precise mechanical alignment, eliminating the coaxial alignment requirement and associated deformation issues.
Solution Approach 2:
The patent introduces light as an intermediary between the rotary member and the measurement device. Rather than directly measuring the rotary member's position through mechanical contact (as with encoders), the system uses light reflection patterns as an intermediate measurement medium. This light-mediated approach allows position measurement without requiring the measurement device to be coaxially aligned with the rotary member axis.
3Measurement precision
If conventional methods are used to measure perpendicularity and parallelism, then measurement can be performed, but large-scale facilities are needed and measurement environment cannot be established in small space
Solution Approach 1:
The patent merges multiple measurement functions (rotational movement angle measurement, perpendicularity measurement, and parallelism measurement) into a single integrated optical measurement system. The same light source and light receiving device that measure rotational angle also capture the light reflection patterns that reveal perpendicularity and parallelism characteristics. This consolidation eliminates the need for separate large-scale measurement facilities for each function, enabling all measurements to be performed in a compact space.
Solution Approach 2:
The patent creates a universal measurement system that performs multiple measurement functions simultaneously. The optical system measures rotational movement angle, perpendicularity, and parallelism using the same light reflection pattern data. This multi-functional approach replaces multiple specialized measurement devices with a single compact system that can establish the measurement environment in small spaces.
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
Enables direct, highly accurate, and easy measurement of rotary member states, achieving precision on the order of 1/3600° without the need for large facilities.
Implementation Method 1
a light source that projects light onto the inclined reference surface; a light receiving device that receives the light from the inclined reference surface
Data Source
AI summary
Provided is a system for measuring the state of a rotary member which can rotate around a rotary member axis line. The system comprises a measurement device including: a rotary mechanism; a support member which can rotate around a support member axis line by means of the rotary member; and a displacement meter that is disposed on the support member. The system further comprise an inclined reference surface, wherein the displacement meter is configured to measure the distance to the inclined reference surface, the rotary member is fixed at a designated measurement position, the rotary mechanism rotates the support member at the measurement position of the rotary member, and the displacement meter measures the distances to the inclined reference surface at a plurality of scan angles due to the rotation of the support member and measures the state of the rotary member on the basis of the distances at the plurality of scan angles.