Electro-Optic Focus Shifting in Laser PCB Hole Processing
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Solution Overview
Problem
Existing laser processing technologies face challenges in achieving high-quality processing and efficient focal point changes during hole-making on printed boards, as the burst mode maintains a constant focal point leading to poor quality and the cycle mode's mechanical adjustments result in inefficient processing.
Innovation Solution
Incorporating an electrooptic device capable of electrically changing the focal point of the laser pulse, allowing for quick adjustments and improved processing efficiency by synchronizing the focal point changes with the Galvano scanner's operation and laser oscillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If burst mode is used with constant focal point, then processing speed is improved, but processing quality deteriorates
Solution Approach 1:
The patent applies the Dynamics principle by transitioning from a static focal point system to a dynamic one. The electrooptic device enables the focal point to be dynamically adjusted during the burst mode processing, allowing the system to maintain high processing speed while adapting the focal point position to match the changing processing depth, thereby resolving the contradiction between speed and quality.
Solution Approach 2:
The patent implements Parameter changes by modifying the focal point position parameter during processing. The electrooptic device changes the focal point parameter in response to processing depth, enabling the system to maintain optimal processing conditions throughout the burst mode operation, thus achieving both high speed and high quality.
2Manufacturing precision
If cycle mode is used with mechanical adjustment, then processing quality is improved, but processing efficiency deteriorates
Solution Approach 1:
The patent applies the Mechanics substitution principle by replacing the mechanical adjustment system with an electrooptic device. This substitution eliminates the need for slow mechanical movements to adjust the focal point, allowing rapid electronic control of focal point position while maintaining processing quality, thus resolving the contradiction between quality and efficiency.
Solution Approach 2:
The patent extracts the focal point adjustment function from the mechanical system and implements it through a separate electrooptic device. This extraction allows the mechanical table to remain stationary while the electrooptic device independently controls focal point position, eliminating the trade-off between mechanical adjustment speed and processing quality.
3Manufacturing precision
If mechanical operation is used to change focal point, then focal point adjustment is achieved, but response time increases
Solution Approach 1:
The patent replaces the mechanical operation system with an electrooptic device for focal point adjustment. This substitution enables instantaneous or near-instantaneous response to focal point positioning commands, eliminating the inherent delay of mechanical systems while maintaining precise positioning capability.
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 high-quality processing with efficient focal point changes, allowing for precise processing of multiple layers on a printed board, enhancing both quality and processing efficiency.
Implementation Method 1
an electrooptic device capable of, under control of the controller, electrically changing a focal point of the laser pulse
Data Source
AI summary
A purpose of the present invention is to quickly change a focal point of a laser emission system so that processing with high quality and good processing efficiency can be performed. In a laser processing apparatus including: a laser oscillator configured to output a laser pulse; a laser deflector configured to deflect the laser pulse in a two-dimensional direction; and a controller configured to control the laser oscillator and the laser deflector, the laser processing apparatus being configured to emit the laser pulse to a workpiece for processing the workpiece, the laser processing apparatus has a feature in which an electrooptic device capable of, under control of the controller, electrically changing a focal point of the laser pulse to be input to the laser deflector is arranged in an input side of the laser deflector.