DAC Amplifier Adjustment During Substrate Transport in E-Beam Writing
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Solution Overview
Problem
The regular maintenance of DAC amplifier units in electron beam writing apparatuses is time-consuming, leading to increased downtime and reduced productivity, while reducing maintenance frequency can result in undetected accuracy issues affecting product quality.
Innovation Solution
Performing at least part of the adjustment work for the DAC amplifier units during the transport of substrates between the interface and the writing chamber, thereby reducing the workload of regular maintenance and shortening downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If regular maintenance of DAC amplifier units is performed frequently to maintain output accuracy, then manufacturing precision is improved, but productivity deteriorates due to increased downtime
Solution Approach 1:
The patent performs gain adjustment and linearity correction of the DAC amplifier unit in advance during substrate transport, before the actual writing process begins. This preliminary action ensures that maintenance is completed beforehand, allowing the writing apparatus to resume normal operation immediately without downtime affecting productivity.
Solution Approach 2:
The patent enables continuous operation by performing maintenance tasks during substrate transport time, which is otherwise idle time in the writing process. This maintains the continuity of useful writing action while still performing necessary maintenance, as the adjustment work is executed during the transport interval rather than interrupting the writing workflow.
2Productivity
If regular maintenance frequency is reduced to increase productivity, then productivity is improved, but reliability deteriorates due to undetected accuracy issues
Solution Approach 1:
The patent implements a feedback mechanism where the output of the DAC amplifier unit is measured and used to calculate correction values for gain and linearity. This feedback loop allows the system to automatically detect and correct accuracy issues during substrate transport, ensuring reliability is maintained even when maintenance frequency is reduced.
Solution Approach 2:
The patent enables the DAC amplifier unit to perform self-diagnosis and self-adjustment during substrate transport. The system automatically measures its own output, calculates correction values, and applies gain and linearity corrections without requiring external intervention, thereby maintaining reliability through autonomous monitoring and adjustment.
3Loss of time
If adjustment work is performed during substrate transport, then loss of time is reduced, but device complexity increases due to integrated adjustment functionality
Solution Approach 1:
The patent merges the maintenance adjustment function with the substrate transport function by integrating the measurement and adjustment operations into the existing transport workflow. The DAC amplifier unit's output is measured and adjusted during the time substrate is being transported, combining two functions into one operational sequence and eliminating the need for separate maintenance downtime.
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 the completion of adjustment works during substrate transport, reducing the downtime of the writing apparatus and improving productivity by minimizing the time required for regular maintenance.
Implementation Method 1
irradiating the substrate on the stage with a charged particle beam to write a pattern
Data Source
AI summary
In one embodiment, a method of adjusting charged particle beam writing apparatus includes transporting a substrate before writing received via an interface from an outside to a writing chamber and placing the substrate on a stage, irradiating the substrate on the stage with a charged particle beam to write a pattern, and transporting the substrate after writing from the writing chamber to the outside via the interface. At least part of adjustment work for devices in the charged particle beam writing apparatus is performed during transport of the substrate between the interface and the writing chamber.