Wafer Grinding Orientation Detection for Separation Surface Exposure
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Solution Overview
Problem
Existing grinding apparatuses risk grinding the wrong surface of wafers, opposite to the separation surface, due to manual handling errors, leading to inefficiencies and potential damage.
Innovation Solution
A grinding apparatus equipped with a holding table, a detecting unit, and a control unit that uses upper surface height measurements, pressure gauges, and light-based detection to determine the exposure state of the separation surface, informing operators of abnormal states and adjusting the wafer orientation as needed to ensure correct surface grinding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual handling of wafers is used to house them in cassettes, then ease of operation is improved, but reliability deteriorates due to risk of gridding the wrong surface
Solution Approach 1:
The system uses detecting units to detect physical quantities (upper surface height, negative pressure, light reflection) and provides feedback to the control unit, which then determines the exposure state of the separation surface and informs the operator or automatically adjusts the wafer orientation, creating a closed-loop feedback system that prevents wrong surface grinding
Solution Approach 2:
The system enables self-service by automatically detecting the wafer orientation through physical quantity measurements and determining the exposure state of the separation surface without requiring manual inspection, allowing the apparatus to self-correct or self-alert regarding wafer orientation
2Reliability
If detection units and control systems are added to determine wafer orientation, then reliability is improved, but device complexity increases
Solution Approach 1:
The system replaces manual mechanical inspection with automated detection using physical quantity sensors (height detectors, pressure gauges, light receivers) that objectively measure wafer orientation and separation surface exposure state without requiring human judgment
Solution Approach 2:
The control unit serves multiple functions: it receives data from various detecting units, determines the exposure state of the separation surface, informs operators of abnormal states, and can control the conveying unit to correct wafer orientation, consolidating multiple functions into a single control system
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 apparatus significantly reduces the likelihood of grinding the wrong surface, enhancing processing accuracy and preventing damage to wafers by automatically detecting and correcting the orientation of the separation surface.
Implementation Method 1
a light projecting part that irradiates either one of surfaces of the wafer temporarily placed on the position adjustment unit with light and a light receiving part that receives reflected light reflected by the wafer
Implementation Method 2
when the wafer is to be sucked by a holding surface of the holding table
Data Source
AI summary
A grinding apparatus includes a holding table that holds a wafer, a grinding unit that grinds an exposed surface of the wafer held by the holding table, a detecting unit that detects a physical quantity used for determination of the state of exposure of a separation surface of the wafer, and a control unit having an exposure determining unit that determines the state of exposure of the separation surface on the basis of the physical quantity detected by the detecting unit.