Shape Measuring Device Focal Position Adjustment
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Solution Overview
Problem
Existing shape measuring devices face limitations in expanding the depth measurement range while maintaining sufficient visual field and resolution, requiring multiple measurements and long processing times to acquire stereoscopic shape data, which is not intuitive for users and can be time-consuming.
Innovation Solution
A shape measuring device with a stage, light projecting and receiving sections, and optical-axis-direction driving mechanisms that adjust focal positions and combine height images to expand the depth measurement range by determining unmeasured regions and automatically repeating measurement and focal position changes until the entire range is covered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the depth measurement range is expanded by combining multiple measurement data, then the measurable height range is improved, but the measurement time and processing time are increased
Solution Approach 1:
The system performs preliminary acquisition of stereoscopic shape data within the initial depth measurement range before full measurement is required. This allows the system to prepare measurement data in advance and identify unmeasured regions, enabling more efficient subsequent measurements by focusing only on areas that need additional depth coverage rather than remeasuring entire regions.
Solution Approach 2:
The measurement process is divided into segments: first acquiring data in the initial depth range, then identifying unmeasured regions, and finally performing targeted additional measurements only in those specific regions. This segmentation avoids redundant measurements and reduces total measurement time while still achieving expanded depth coverage.
2Length of stationary object
If the depth measurement range is expanded by combining multiple measurement data, then the measurable height range is improved, but the device complexity is increased
Solution Approach 1:
The system automatically performs the entire process of acquiring stereoscopic shape data, determining unmeasured regions, adjusting focal positions, and combining measurement results without requiring manual intervention. The determination processing section autonomously identifies where additional measurements are needed, and the optical-axis-direction driving section automatically adjusts focal positions, making the complex multi-step process transparent to the user.
Solution Approach 2:
The system uses feedback from the acquired stereoscopic shape data to automatically determine unmeasured regions and adjust subsequent measurement parameters. The determination processing section analyzes the measurement results and provides feedback to control the focal position adjustments, creating a closed-loop system that adapts to the actual measurement needs without manual input.
3Measurement precision
If stereoscopic shape data is acquired in advance to display measurable ranges, then the visual field and resolution are improved, but the processing time is increased
Solution Approach 1:
The system performs partial acquisition of stereoscopic shape data - enough to identify unmeasured regions but not necessarily complete coverage of all possible measurement areas. This partial action provides sufficient information to guide subsequent measurements while avoiding the excessive processing time required for complete preliminary data acquisition across the entire potential measurement volume.
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 efficient expansion of the depth measurement range, reducing processing time and improving user convenience by automatically adjusting focal positions and combining height images to cover the entire measurement area.
Implementation Method 1
a light receiving section configured to receive the pattern light irradiated from the light projecting section and reflected from the measurement object
Implementation Method 2
a shape measuring device that measures a shape of the surface of a measurement object (work) according to a pattern projection method using the principle of triangulation
Data Source
AI summary
A shape measuring device 100 includes a control section 200 for executing determination processing for determining an unmeasured region having height information is present outside a depth measurement range, which is a height range in which pattern light can be irradiated from a light projecting section, focal-position changing processing for controlling an optical-axis-direction driving section to change a focal position of a light receiving section when it is determined by the determination processing that the unmeasured region is present, and synthesis processing for generating synthesized stereoscopic shape data obtained by combining a plurality of stereoscopic shape data generated by automatically repeating the stereoscopic-shape-data acquisition processing, the determination processing, and the focal-position-changing processing until it is determined by the determination processing that the unmeasured region is absent or a predetermined end condition is satisfied.