Laser Irradiation Apparatus Optical Path Switching for Annealing Continuity
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Solution Overview
Problem
Laser annealing apparatuses with multiple laser units face operational disruptions if a single unit becomes inoperable due to mechanical issues or maintenance, leading to incomplete annealing of amorphous silicon films on workpieces.
Innovation Solution
Incorporating a beam delivery section that can switch between optical paths of multiple laser units and beam property varying sections to adjust optical path lengths and beam properties, allowing laser light from operable units to be redirected to inoperable units' optical paths, ensuring continuous operation and uniform irradiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple laser units are used for laser annealing, then productivity and annealing coverage are improved, but reliability deteriorates because the system becomes vulnerable to mechanical failures and maintenance interruptions
Solution Approach 1:
The beam delivery section is designed with optical path switching capability that allows any operable laser unit to deliver beams to any irradiation head. This multi-functional design enables the system to maintain annealing operations even when some laser units are under maintenance or malfunctioning, as the remaining units can serve multiple irradiation heads through optical path switching.
Solution Approach 2:
The beam delivery section acts as an intermediary between laser units and irradiation heads, providing optical path switching functionality. This intermediary mechanism decouples the direct one-to-one relationship between laser units and irradiation heads, allowing flexible redistribution of laser beams to maintain continuous operation despite failures in individual components.
2Reliability
If optical path switching is implemented between multiple laser units, then reliability is improved by enabling continuous operation, but device complexity increases due to additional beam delivery components
Solution Approach 1:
The beam delivery section is designed as a universal system that can route beams from any laser unit to any irradiation head. This multi-functional design consolidates the beam delivery capability into a shared resource rather than requiring dedicated delivery paths for each laser unit, which helps manage complexity while maintaining reliability.
Solution Approach 2:
The patent merges the beam delivery functions of multiple laser units into a single integrated beam delivery section with switching capability. Instead of having separate delivery systems for each laser unit, the functions are combined into one system that can dynamically allocate beam paths, reducing overall system complexity while maintaining operational flexibility.
3Manufacturing precision
If beam property varying sections are added to maintain uniform irradiation during optical path switching, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
Beam property varying sections are introduced at specific locations in the optical path to adjust local beam characteristics such as intensity distribution and focal properties. This localized adjustment ensures uniform irradiation on the workpiece regardless of which laser unit or optical path is being used, maintaining manufacturing precision without requiring complete redesign of the entire optical 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
Enables uninterrupted annealing of amorphous silicon films even if one or more laser units are inoperable, maintaining the integrity of the annealing process and preventing incomplete crystallization of silicon films.
Implementation Method 1
The first laser unit may be configured to output first laser light, and the second laser unit may be configured to output second laser light
Implementation Method 2
The beam delivery section may be configured to perform switching of optical paths between an optical path of the first laser light and an optical path of the second laser light
Implementation Method 3
The first beam property varying section may be configured to vary a beam property of one of the first laser light and the second laser light in response to the switching of the optical paths
Data Source
AI summary
A laser irradiation apparatus may include: an irradiation head section including first and second irradiation heads each configured to perform laser light irradiation on a workpiece; a laser unit section including first and second laser units configured to respectively output first laser light and second laser light; a beam delivery section provided in an optical path between the laser unit section and the irradiation head section, and configured to perform switching of optical paths between optical paths of the first laser light and the second laser light to cause the first or second laser light to enter the first or second irradiation head; a first beam property varying section provided in an optical path between the first laser unit and the irradiation head section; and a second beam property varying section provided in an optical path between the second laser unit and the irradiation head section.