Optical Measuring Device Dual Focus Position Detection
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Solution Overview
Problem
Conventional optical measuring devices face challenges in accurately detecting the edge position of a measurement object, especially when it is not positioned at the focused point, leading to difficulties in determining the correct placement of the object for precise measurement.
Innovation Solution
The optical measuring device employs a dual optical system with distinct foci to determine the state of the measurement object relative to the focus, allowing for accurate calculation of its position and displacement from the focus, enabling precise alignment and improved measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single optical system with one focus is used, then the device complexity is low, but the measurement precision deteriorates when the object is not positioned at the focused point
Solution Approach 1:
The optical system is segmented into multiple optical systems (first optical system with first focus, second optical system with second focus), each responsible for detecting objects at different focal positions. This segmentation allows the system to maintain high measurement precision regardless of object positioning, as at least one optical system will have its focus aligned with the object.
Solution Approach 2:
The patent extends the optical system from a single-focus one-dimensional configuration to a multi-focus configuration by adding spatial dimensions. The first and second optical systems are arranged with different focal positions along the optical axis, creating a multi-dimensional focal space that covers a broader range of object positions.
2Ease of operation
If the object is positioned away from the focused point, then the ease of operation improves (no precise positioning required), but the measurement precision deteriorates due to moderate light amount change at edge positions
Solution Approach 1:
The measurement function is segmented across multiple optical systems with different focal points. This allows the system to automatically adapt to objects at various positions without requiring precise manual positioning, as each optical system handles a specific focal plane.
Solution Approach 2:
The combined optical system achieves universal functionality by being able to measure objects at multiple focal positions simultaneously. The first and second optical systems work together to provide comprehensive coverage, making the measurement device adaptable to various object placements without losing precision.
3Reliability
If the light amount change at edge positions is moderate, then the reliability of detection improves (less sensitive to positioning errors), but the measurement precision deteriorates (cannot correctly detect edge position)
Solution Approach 1:
The detection function is segmented into multiple optical systems, each providing a distinct light amount distribution pattern. By comparing patterns from multiple systems, the system can reliably determine edge positions even when individual patterns show moderate changes, as the combined information provides both stability and precision.
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 approach allows for easy and accurate determination of the measurement object's position and displacement from the focus, enhancing measurement accuracy and enabling correct positioning within the effective measurement region.
Implementation Method 1
a first optical system having a first focus within the measurement space, and configured to direct the light projected from the light projecting unit and passing through the measurement space toward the first light receiving unit
Implementation Method 2
a second optical system having a second focus within the measurement space, and configured to direct the light projected from the light projecting unit and passing through the measurement space toward the second light receiving unit
Data Source
AI summary
Provided is an optical measuring device capable of easily improving accuracy in measurement of a measurement object. Light is projected from a light projecting unit into a measurement space. Light passing through the measurement space is directed toward a first image sensor through a first optical system, and directed toward a second image sensor through a second optical system. Within the measurement space, a position of a first focus of the first optical system and a position of a second focus of the second optical system in an X direction are different from each other. Whether the measurement object is positioned at the first focus, on a side of the first focus closer to the light projecting unit, or on a side of the first focus away from the light projecting unit is determined based on the signals outputted from the first and the second image sensor.