Scheimpflug Shape Measurement Device Region Selection
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Solution Overview
Problem
Existing shape measurement devices using the Scheimpflug principle face a tradeoff between measurement accuracy and range, requiring multiple probes with different specifications, leading to high costs and increased installation time due to fixed optical components.
Innovation Solution
A shape measurement device that adjusts measurement range and accuracy by dividing the imaging plane into multiple regions, allowing selection of the appropriate image obtaining region based on designated measurement requirements, without the need to replace the image-forming lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If an image-forming lens of low magnification is used, then a wide measurement range is achieved, but measurement accuracy deteriorates
Solution Approach 1:
The imaging plane of the imaging element is divided into multiple regions (first region and second region). The first region is used for wide-range measurement with lower accuracy requirements, while the second region is used for high-accuracy measurement of specific areas. This segmentation allows the system to achieve both wide measurement range and high measurement accuracy by selecting the appropriate region based on measurement needs.
2Measurement precision
If an image-forming lens of high magnification is used, then measurement accuracy is improved, but measurement range deteriorates
Solution Approach 1:
The imaging plane is segmented into multiple regions with different characteristics. The second region (with higher magnification characteristics) is used when high measurement accuracy is required, while the first region (with wider coverage) is used for broader measurement ranges. This allows the system to adapt to different measurement requirements without physical lens changes.
Solution Approach 2:
The system dynamically selects which region of the imaging plane to use based on the measurement requirements (accuracy vs. range). This dynamic selection allows the same probe to adapt to different measurement scenarios, effectively providing both high magnification and low magnification capabilities as needed.
3Adaptability or versatility
If multiple probes with different specifications are prepared, then adaptability to different measurement requirements is improved, but device complexity and cost increase
Solution Approach 1:
A single probe is designed to perform multiple functions by utilizing different regions of the imaging plane. The same probe can switch between wide-range measurement mode (using first region) and high-accuracy measurement mode (using second region), eliminating the need for multiple specialized probes and reducing system complexity and cost.
4Measurement precision
If probes are exchanged to match measurement requirements, then measurement accuracy and range are optimized, but installation time and operational complexity increase
Solution Approach 1:
Instead of physically exchanging probes, the system dynamically selects the appropriate region of the imaging plane through control unit processing. This software-based region selection allows instant switching between measurement modes without any physical intervention, probe removal, or realignment operations, significantly reducing installation and operational time.
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 flexible measurement by allowing adjustment of measurement range and accuracy without changing the image-forming lens, reducing costs and installation time, while maintaining high-speed scanning capabilities.
Implementation Method 1
a light irradiation unit which irradiates linear light onto a work
Implementation Method 2
an imaging element which images reflected light of the light irradiated from the light irradiation unit, the reflected light being reflected by the work
Implementation Method 3
an image-forming lens which forms an image of the reflected light reflected by the work on an imaging plane of the imaging element
Implementation Method 4
a light irradiation plane of the light irradiation unit, a principal plane including a principal point of the image-forming lens, and the imaging plane of the imaging element satisfy a Scheimpflug principle
Data Source
AI summary
Disclosed is a shape measurement device including: a light irradiation unit which irradiates linear light onto a work; an imaging element which images reflected light reflected by the work; and an image-forming lens which forms an image of the reflected light reflected by the work on an imaging plane of the imaging element, and a light irradiation plane of the light irradiation unit, a principal plane including a principal point of the image-forming lens, and the imaging plane of the imaging element satisfy a Scheimpflug principle. The shape measurement device further includes: an image obtaining region selection unit which divides the imaging plane of the imaging element into a plurality of regions, and selects, as an image obtaining region, a region for use in measurement from the plurality of regions in response to at least one of measurement accuracy and a size of a measurement range.