High-Speed Laser Marking With Grid Pulses for Precise Codes
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Solution Overview
Problem
Current laser marking technologies are limited by slow speed and low precision, particularly when marking small characters or machine-readable graphics like UPC or QR codes, as they often result in imprecise and large spot sizes, making them difficult for consumers and machines to read.
Innovation Solution
A method using a pulsed laser with a high repetition rate and constant velocity to form marks in a grid pattern, allowing for bi-directional motion and varying distances between marks, which enables faster and more precise marking of alphanumeric characters and graphics by adjusting the X and Y distances and using galvo sets to control the laser beam's direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional laser marking processes are used, then marking can be performed on articles, but the marking speed is slow and precision is poor
Solution Approach 1:
The patent segments the marking process into discrete pulse events occurring at specific grid locations rather than continuous scanning. The laser beam is directed to mark individual spots at predetermined positions in a grid pattern, with each pulse being independently controlled. This segmentation allows for precise positioning at each mark location while maintaining high overall marking speed through parallel processing capability.
Solution Approach 2:
The patent pre-calculates and pre-determines the exact timing and positioning of each laser pulse before the marking process begins. The system calculates the precise moment each pulse should occur based on the moving article's position and the desired grid pattern, allowing the laser to fire at optimal moments without real-time feedback delays. This preliminary action enables high-speed marking while maintaining precision.
2Productivity
If single lines of large spots are used for date codes, then marking can be performed quickly, but the characters are imprecise and difficult to read
Solution Approach 1:
The patent applies different marking qualities to different locations within the grid pattern. Each grid location can be independently configured to receive a mark or remain unmarked, allowing for precise character formation. The system can vary the spot size, intensity, and presence of marks at different locations to create legible alphanumeric characters while maintaining high marking speed through the predetermined grid approach.
3Manufacturing precision
If current laser marking technologies are used for small characters, then marking can be performed, but the spot sizes are large and imprecise
Solution Approach 1:
The patent replaces complex mechanical positioning systems with a computational approach. Instead of using精密 mechanical stages to position the laser with high precision, the system uses a moving article reference frame combined with predetermined grid calculations to achieve precise mark placement. The laser beam is directed to predetermined locations based on the article's motion, substituting mechanical precision requirements with computational timing and positioning.
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 creation of consumer- and machine-readable text and graphics at high speeds, replacing traditional labels and adhesives, while providing cost savings and environmental benefits through reduced material usage and easier recycling.
Implementation Method 1
using the laser beam to form a plurality of marks on the article surface in a grid pattern by at least one of foaming, ablating, etching, reducing, oxidizing, and carbonizing
Data Source
AI summary
Processes for laser marking articles having a predetermined feature marked onto a wall that is either user readable, machine readable, or both. Also, methods of making the marked articles by laser marking.