Rotary Sorter for High-Speed Substrate Inspection
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Solution Overview
Problem
Current substrate inspection systems face challenges in achieving high throughput due to time-consuming comprehensive inspections and the need for faster sorting apparatuses to keep up with reduced inspection times.
Innovation Solution
A high-speed rotary sorter system with a rotatable support and radially extending arms equipped with grippers that sort substrates into individually removable bins based on metrology data, capable of sorting at least 5,400 substrates per hour.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If comprehensive inspections are performed at multiple inspection stations, then inspection thoroughness is improved, but inspection time and throughput are reduced
Solution Approach 1:
The patent transitions from a static linear inspection system to a dynamic rotary sorting system. The rotary sorter enables continuous movement and sorting of substrates through multiple inspection stations, allowing the system to maintain comprehensive inspection capabilities while increasing throughput by eliminating idle transfer times and enabling parallel processing.
Solution Approach 2:
The rotary sorting system enables continuous operation by eliminating the stop-start nature of linear transfer systems. Substrates can be continuously fed through multiple inspection stations while the rotary mechanism sorts them into different bins based on inspection results, maintaining continuous useful action without interruption for sorting operations.
2Device complexity
If linear sorting systems are used, then system simplicity is maintained, but sorting speed is limited to approximately 3,600 substrates per hour
Solution Approach 1:
The patent employs a rotary (circular) sorting mechanism instead of a linear arrangement. This curved/spheroidal configuration allows multiple sorting positions to be accessed simultaneously during a single rotation, dramatically increasing sorting capacity from 3,600 to over 18,000 substrates per hour while maintaining relatively simple mechanical components.
Solution Approach 2:
The system transitions from one-dimensional linear sorting to two-dimensional rotary sorting. By adding the rotational dimension, the system can service multiple bins simultaneously during each rotation cycle, effectively multiplying the sorting capacity without proportionally increasing the number of mechanical components.
3Productivity
If high speed sorting is implemented, then throughput is increased, but substrate handling gentleness may be compromised
Solution Approach 1:
The patent replaces traditional mechanical grippers with magnetic field-based handling. The magnetic field gently holds and transports substrates without physical contact or mechanical stress, enabling high-speed operation (over 18,000 substrates per hour) while preventing substrate damage through non-contact handling.
Solution Approach 2:
The system changes the handling parameter from mechanical force to magnetic field strength. By controlling magnetic field parameters, the system can achieve both high-speed sorting and gentle substrate handling, as the magnetic force can be precisely controlled to hold substrates without applying excessive force that could cause damage.
Data Source
AI summary
Embodiments of the present disclosure generally relate to expandable substrate inspection systems. The inspection system includes multiple metrology units adapted to inspect, detect, or measure one or more characteristics of a substrate, including thickness, resistivity, saw marks, geometry, stains, chips, micro cracks, and crystal fraction. The inspection systems may be utilized to identify defects on substrates and estimate cell efficiency prior to processing a substrate. Substrates may be transferred through the inspection system and/or between metrology units on a track or conveyor, and then sorted via at least one gripper coupled with the high speed rotatory sorting apparatus into respective bins based upon the inspection data. The rotary sorting apparatus maintains a sorting capability of at least 5,400 substrates per hour. Each bin may optionally have a gas support cushion for supporting the substrate as it falls from the rotary sorting apparatus into the respective bin.