3D Measurement System Using Rotary Light-Shielding Disc
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Solution Overview
Problem
Traditional three-dimensional measurement systems for electronic components face high manufacturing costs and space requirements due to the need for multiple projector modules, and accuracy issues arise from mechanical and optical path fluctuations in optical path switching mechanisms.
Innovation Solution
A three-dimensional measurement system that uses a light-shielding rotary disc and a fixed optical-reflective ring structure to generate and project stripe-patterned structure-light beams onto a test object, eliminating the need for multiple projector modules and minimizing mechanical movements, thus reducing costs and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple projector modules are implemented at different angles, then fringe pattern projections along different incident angles can be generated, but manufacturing cost and device space increase significantly
Solution Approach 1:
The patent combines multiple projection functions into a single projector module by integrating an optical path switching mechanism. This mechanism uses a switching mirror and beam splitter to direct light from one projector to multiple projection paths at different angles, eliminating the need for multiple separate projector modules while maintaining the capability to project fringe patterns at various incident angles.
Solution Approach 2:
The single projector module is designed with multi-functionality through the optical path switching mechanism. The same projector can sequentially or simultaneously project fringe patterns along multiple different incident angles by switching the optical path, making one device perform the work of multiple specialized projectors.
2Device complexity
If an optical path switching mechanism with moving parts is used, then single projector module suffices, but mechanical vibrations cause optical path fluctuations and measurement inaccuracy
Solution Approach 1:
The patent replaces the traditional mechanical optical path switching mechanism (using moving mirrors and switches) with a fixed optical path switching structure. This new mechanism uses fixed beam splitters and reflective surfaces arranged in a specific geometric configuration to achieve optical path switching without any moving parts, thereby eliminating mechanical vibrations and improving optical path stability for accurate measurements.
3Volume of stationary object
If traditional optical path switching with moving mirrors is used, then space requirements are reduced, but mechanical vibrations cause excessive measurement error
Solution Approach 1:
The patent eliminates mechanical moving parts in the optical path switching mechanism by using a fixed optical structure with beam splitters and reflective surfaces. This fixed structure achieves the same optical path switching function without mechanical vibrations, thereby maintaining compact space requirements while significantly improving measurement 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 solution reduces manufacturing costs, minimizes space requirements, and enhances measurement precision by avoiding mechanical and optical path fluctuations, resulting in accurate three-dimensional measurements.
Implementation Method 1
a light beam passes through an aperture formed in the light-shielding rotary disc and is formed into a plurality of light beam segments facing different directions in a time-sequential manner
Implementation Method 2
Each of the light beam segments is transformed into a stripe-patterned structure-light beam
Implementation Method 3
reflected by a fixed optical reflective structure onto a test object
Data Source
AI summary
A three-dimensional measurement system includes a measurement platform, a projection module, an image-capturing module, and a control unit. The measurement platform carries a test object. The projection module includes a light-emitting unit, a light-shielding rotary disc, a grating unit, and an optical-reflective ring structure. The light-emitting unit generates a light beam. An aperture formed in the light-shielding rotary disc is located at different rotational positions time-sequentially while the light-shielding rotary disc rotates, and the light beam passes through the aperture to form light beam segments. The grating unit transforms the light beam segments into stripe-patterned structure-light beams. The optical-reflective ring structure reflects the stripe-patterned structure-light beams onto the test object. The image-capturing module captures stripe-patterned images formed after reflection of the stripe-patterned structure-light beams from the test object. The control unit measures a three-dimensional shape of the test object using the stripe-patterned images.