Laser Scan Alignment for Conveyance Vibration Accuracy
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Solution Overview
Problem
Existing laser irradiation systems face accuracy issues when objects experience vibration or speed fluctuations during conveyance, leading to inconsistent intervals between image lines and reduced laser irradiation accuracy.
Innovation Solution
A laser irradiation apparatus and method that scans the object with a laser beam in a direction parallel to the conveyance direction, using a scanner to ensure the scanning direction aligns with the object's movement, and optionally divides the irradiation region into smaller segments to enhance accuracy and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the laser beam scans the object in a direction intersecting the conveyance direction (conventional method), then the irradiation region can be covered, but the accuracy of laser irradiation is lowered when vibration or speed fluctuation occurs during conveyance
Solution Approach 1:
The patent inverts the conventional scanning approach by scanning the laser beam in the conveyance direction (parallel to object movement) rather than intersecting it. This reversal makes the scanning synchronized with the object's motion, so that even when vibration or speed fluctuation occurs, the laser continuously tracks the object's position, maintaining irradiation accuracy and consistency.
2Area of stationary object
If the scanning distance in the sub-scanning direction is long, then the irradiation region can be fully covered, but the impact of vibration and speed fluctuation increases
Solution Approach 1:
The patent segments the irradiation region into multiple smaller regions and scans them sequentially in the conveyance direction. By dividing the long sub-scanning distance into shorter segments that are scanned in the direction of object movement, the system maintains better synchronization with the object's motion, reducing the cumulative effect of vibration and speed fluctuations on interval consistency.
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 proposed system significantly reduces the impact of conveyance-related vibrations and speed fluctuations, maintaining consistent intervals between modified portions and improving the overall accuracy and productivity of laser-irradiated image patterns.
Implementation Method 1
a laser oscillator to oscillate a laser beam and irradiate, with the laser beam, an irradiation region of an object conveyed in a conveyance direction
Implementation Method 2
a scanner to scan the irradiation region with the laser beam in a main scanning direction along the conveyance direction and in a sub-scanning direction intersecting the main scanning direction
Data Source
AI summary
A laser irradiation apparatus includes a laser oscillator to oscillate a laser beam and irradiate, with the laser beam, an irradiation region of an object conveyed in a conveyance direction, and a scanner to scan the irradiation region with the laser beam in a main scanning direction along the conveyance direction and in a sub-scanning direction intersecting the main scanning direction. The scanner scans, with the laser beam, the irradiation region having a first size in the main scanning direction and a second size smaller than the first size in the sub-scanning direction.