Silicon Fragment Sorting Using 3D Size Measurement
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Solution Overview
Problem
Existing methods for sorting silicon chunks based on two-dimensional projection are prone to errors due to variations in chunk orientation, leading to incorrect size estimation.
Innovation Solution
A method that includes recording the projected area of a chunk using a first measuring device and obtaining height information from a second measuring device, allowing for accurate calculation of the chunk's size by combining these measurements to improve sorting accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If two-dimensional projection method is used for recording chunk size, then the measurement process is simple, but sorting errors occur due to variations in chunk orientation
Solution Approach 1:
The patent transitions from two-dimensional projection recording to three-dimensional recording by adding height information measurement. The recording device now captures not only the projected area in the x-y plane but also the height (z-dimension) of each chunk, enabling accurate volume calculation regardless of chunk orientation. This dimensional expansion resolves the sorting errors caused by varying orientations while maintaining measurement simplicity.
2Productivity
If only projected area is recorded, then the measurement process is fast, but incorrect size estimation occurs for unfavorably oriented chunks
Solution Approach 1:
By incorporating height measurement into the existing projected area recording system, the patent enables accurate volume determination without significantly increasing measurement time. The height information is captured simultaneously with the projected area data, allowing immediate calculation of chunk volume that is independent of orientation, thus maintaining productivity while improving precision.
Solution Approach 2:
The patent introduces height information as an intermediary parameter that mediates between the projected area measurement and the final chunk size estimation. By calculating volume as a function of both projected area and height, the system overcomes the limitation of projected area alone, which is sensitive to orientation. This intermediary measurement enables accurate size estimation while preserving measurement speed.
3Measurement precision
If three-dimensional information is recorded to improve accuracy, then sorting precision is improved, but device complexity increases
Solution Approach 1:
The patent enhances the existing recording device to perform multiple functions: it continues to record the projected area in the x-y plane while simultaneously measuring the height in the z-dimension. This multi-functional approach allows the single device to capture complete three-dimensional information needed for accurate volume calculation, improving precision without proportionally increasing device complexity.
Solution Approach 2:
The patent adds height measurement capability to the existing two-dimensional recording system, enabling three-dimensional reconstruction of chunk geometry. This dimensional enhancement allows accurate volume determination from a single measurement point, avoiding the need for multiple measurement devices or complex multi-view imaging systems, thus improving precision with minimal increase in device complexity.
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
The method significantly reduces sorting errors by incorporating height information, ensuring precise separation of silicon chunks into defined size classes.
Implementation Method 1
Recording the projected area of a chunk in a 2D profile plane with at least one first measuring device
Implementation Method 2
Recording at least one height information item above and/or below the 2D profile plane with at least one further measuring device
Data Source
AI summary
Methods and devices for sorting silicon fragments. The method includes the steps of singulating the chunks in a singulating region and recording the projected area of a chunk in a 2D profile plane with at least one first measuring device. Recording at least one height information item above and/or below the 2D profile plane with at least one further measuring device. Calculating the size of the chunk from the projected area and the height information item and controlling at least one deflecting device as a function of the calculated size.