Direct Imaging Exposure Head Compensation for Modulator Defects
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Solution Overview
Problem
Direct imaging systems using optical modulators like DMD or GLV face challenges when defects occur, as existing technologies do not effectively compensate for failures in a single exposure head, leading to incomplete exposure.
Innovation Solution
A direct imaging system with multiple optical modulator elements arranged in a sub-scanning direction, utilizing a control system to selectively use defect-free elements for exposure, allowing the system to continue operation by performing multiple exposures with these elements, thereby compensating for defective ones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single exposure head with optical modulator is used, then device complexity is reduced, but reliability deteriorates when defects occur in the optical modulator
Solution Approach 1:
The patent divides the exposure head into multiple independent exposure units (first exposure head and second exposure head), each with its own optical modulator. This segmentation allows the system to isolate defects to specific units and continue operation using functional units, resolving the contradiction between device simplicity and reliability.
Solution Approach 2:
The patent dynamically changes the operational parameters by switching between different exposure heads based on the detected defect location. When a defect is detected in one optical modulator, the control unit changes the exposure configuration to use the other exposure head, maintaining reliability while keeping the overall device structure relatively simple.
2Reliability
If multiple exposure heads are used to compensate for defects, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the exposure system into multiple independent exposure heads that can operate autonomously. This segmentation enables redundancy without requiring complex interdependence between components, as each exposure head can function independently when others are defective.
Solution Approach 2:
The patent implements dynamic switching between exposure heads based on real-time defect detection. The control unit dynamically adjusts which exposure head is active, allowing the system to adapt to defects without requiring all exposure heads to be simultaneously operational, thus managing complexity through dynamic rather than static configuration.
3Productivity
If exposure continues using defective optical modulator elements, then productivity is maintained, but manufacturing precision deteriorates due to incomplete exposure
Solution Approach 1:
The patent incorporates a detection unit that provides feedback about the operational status of each optical modulator element. Based on this feedback, the control unit determines which exposure heads can reliably perform exposure and switches accordingly, ensuring both continuous productivity and precise exposure completion without using defective elements.
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
Ensures complete exposure of the substrate even with defects in the optical modulator by using defect-free elements for multiple exposures, maintaining exposure quality without requiring replacement or repair of the modulator.
Implementation Method 1
an optical modulator, having a plurality of elements arranged corresponding to a sub scanning direction, the optical modulator being for modulating light from the light source
Implementation Method 2
an exposure head, for exposing a substrate with the light modulated by the optical modulator
Data Source
AI summary
A direct imaging system includes an optical modulator having multiple elements arranged corresponding to a sub scanning direction and for modulating light from a light source, and an exposure head for exposing the substrate with the light modulated by the optical modulator. A control part relatively moves the exposure head in a main scanning direction to expose the sub exposure area with the light modulated using a selection element, and after the sub exposure area is exposed, relatively moves the exposure head an amount corresponding to a sub exposure width in the sub scanning direction. Accordingly, exposure can be continued even if there is a defect in the optical modulator.