Wafer Thinning System with Integrated Rough and Fine Grinding
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Solution Overview
Problem
The existing two-step grinding process for wafer thinning is inefficient due to separate and independent operations, requiring step-by-step detection and limiting continuous thinning efficiency.
Innovation Solution
A wafer thinning system with a first conveying mechanism that sequentially includes a rough grinding mechanism, a fine grinding mechanism, and a detection mechanism, along with transfer and conveying mechanisms to continuously process wafers and perform secondary grinding when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a two-step grinding operation with separate rough grinding and fine grinding mechanisms is used, then the wafer thinning precision is improved, but the wafer thinning efficiency deteriorates due to separate and independent operations requiring step-by-step detection
Solution Approach 1:
The patent combines the rough grinding mechanism and fine grinding mechanism into a single integrated thinning mechanism that can perform both rough grinding and fine grinding operations. This merging eliminates the need for separate transfer operations and intermediate detection steps between rough and fine grinding, thereby improving wafer thinning efficiency while maintaining the precision benefits of both grinding steps.
Solution Approach 2:
The integrated thinning mechanism enables continuous processing of wafers through rough grinding and fine grinding in one continuous operation. The mechanism can switch between rough grinding mode and fine grinding mode without interrupting the processing flow, eliminating idle time and transfer operations, thus achieving continuous useful action that improves productivity.
2Productivity
If multiple transfer mechanisms and conveying mechanisms are added to enable continuous processing and secondary grinding, then the wafer thinning efficiency is improved, but the device complexity increases
Solution Approach 1:
The first conveying mechanism is designed to serve multiple functions: it conveys carrying mechanisms from the rough grinding mechanism to the fine grinding mechanism, and also serves as the return path for carrying mechanisms that require secondary fine grinding. This multi-functionality reduces the need for separate dedicated conveying paths, thereby improving efficiency while limiting the increase in device complexity.
Solution Approach 2:
The system dynamically adjusts the processing flow based on wafer thickness requirements. The controller determines whether a wafer needs secondary fine grinding based on detection results, and dynamically routes the carrying mechanism through appropriate paths using the transfer mechanisms. This dynamic adaptability allows the system to optimize efficiency for each wafer while using a flexible but not overly complex mechanical structure.
Data Source
AI summary
The invention relates to the technical field of wafer processing, and specifically discloses a wafer thinning system and a thinning method. The system includes a first transfer mechanism, a first conveying mechanism and a second transfer mechanism, as well as a rough grinding mechanism, a fine grinding mechanism and a detection mechanism disposed on the first conveying mechanism. The system further includes carrying mechanisms, a second conveying mechanism, and a controller. The controller is configured to control the first conveying mechanism to convey the carrying mechanisms and control the rough grinding mechanism, the fine grinding mechanism and the detection mechanism to sequentially perform rough grinding, fine grinding and thickness detection on the wafers. The system can implement rough grinding, fine grinding and thickness detection for the wafers, thereby implementing continuous thinning of the wafer and increasing the yield of wafer thinning.