Laser Scan Pattern Control for Uniform Surface Irradiation
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Solution Overview
Problem
Existing laser irradiation techniques often result in uneven surface quality due to local increases in laser irradiation times, leading to deeper irradiation marks and reduced surface quality, particularly at the periphery of scanning patterns and during manual operation where speed variations occur.
Innovation Solution
A laser irradiation apparatus and method that periodically adjust the emission direction and shift amount of the laser beam to follow a predetermined scanning pattern, with an irradiation control section stopping or reducing laser emission in areas prone to excessive irradiation, such as near the center of the scanning pattern, to maintain uniformity and prevent deep marks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the laser beam is continuously irradiated while the irradiation head moves or oscillates to scan the surface, then the surface processing (cleaning or treatment) is performed, but local increase in irradiation times occurs in regions apart from the center of the irradiation circle, causing deeper irradiation marks and uneven surface quality
Solution Approach 1:
The patent applies local quality by differentiating the irradiation control across different regions of the scanning pattern. The control section identifies stagnation regions where the irradiation head moves slowly or reverses direction, and applies reduced laser intensity or intermittent irradiation specifically in these regions, while maintaining normal irradiation in other areas. This regional differentiation prevents excessive irradiation marks in stagnation zones while preserving processing efficiency in high-speed regions.
Solution Approach 2:
The patent implements periodic action by controlling the laser irradiation to be intermittent rather than continuous. The control section monitors the movement state of the irradiation head and periodically adjusts the laser emission, reducing or stopping irradiation during stagnation regions where the head moves slowly or reverses. This periodic on-off control based on movement phases prevents cumulative excessive irradiation while maintaining overall processing productivity.
2Ease of operation
If the irradiation head is moved manually or at variable speeds, then flexibility in operation is achieved, but the moving speed varies in different regions, causing local increase in irradiation times and formation of deep irradiation marks
Solution Approach 1:
The patent applies feedback by using the detection section to monitor the actual moving speed and position of the irradiation head in real-time. This feedback information is fed to the control section, which automatically adjusts the laser irradiation parameters based on the detected movement state. This closed-loop control maintains irradiation uniformity even when manual operation causes speed variations, preserving both operational flexibility and surface quality consistency.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting laser irradiation parameters (intensity, duration, frequency) based on the detected movement speed of the irradiation head. When the head moves slowly or stagnates, the control section reduces laser intensity or interrupts irradiation; when the head moves at normal speed, full irradiation is applied. This adaptive parameter adjustment compensates for manual operation variations while maintaining irradiation uniformity.
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 effectively suppresses local deterioration of surface quality by ensuring consistent laser irradiation times across the scanning pattern, improving the overall surface finish and preventing deep irradiation marks.
Implementation Method 1
a laser beam L; a scanning pattern forming section configured to periodically change at least one of an emission direction and a shift amount (size) of the laser light
Implementation Method 2
an irradiation control section for stopping the irradiation of the laser beam directed to an excessive irradiation prevention area set in a partial region in the scanning pattern or reducing the intensity of the laser beam directed to the excessive irradiation prevention area
Data Source
AI summary
A laser irradiation apparatus irradiates an irradiation object with a laser beam. The apparatus comprises scanning pattern formation sections that change at least either of an emitting direction and a shift amount (size) of a laser beam periodically so that a position irradiated with a laser beam moves periodically along a predetermined scanning pattern on a predetermined plane. And the apparatus comprises an irradiation control section that stops irradiation of a laser beam directed to an excessive irradiation prevention area set in some area in the scanning pattern or makes an intensity of the laser beam lower in comparison with an intensity of a laser beam directed to an area other than the excessive irradiation prevention area.