Laser Light Path Adjustment for Fixed Focus During Head Rotation

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Solution Overview

Problem

Traditional methods for adjusting laser light paths during laser cutting on glass substrates with uneven surfaces are cumbersome and unpredictable, often requiring trial-and-error processes to maintain a fixed focal point, especially when the processing head rotates, leading to deviations in focal positions.

Innovation Solution

An adjustment method and device that uses measuring devices and focal position-calculating tools to determine and adjust laser focal positions through simulation, eliminating the need for observing focal trajectories, by obtaining at least two laser focal positions, calculating their coordinates, and adjusting them to a target focal position using a light modulator.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If traditional trial-and-error adjustment method is used, then the focal point can be maintained on flat surfaces, but the adjustment process becomes cumbersome and unpredictable on uneven surfaces with curve surfaces

Engineering Contradiction:

Improvefocal point position accuracyVSAvoidadjustment process complexity

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The patent applies preliminary action by pre-calculating the focal point trajectory using a computer simulation before actual adjustment. The system calculates the arc path that the focal point will follow during rotation and determines the optimal adjustment amount in advance, eliminating the need for traditional trial-and-error methods on uneven surfaces.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces the mechanical trial-and-error adjustment system with a computational system. A computer calculates the focal point coordinates at different rotation angles, determines the arc path, and computes the required adjustment amount, substituting manual observation and iterative adjustment with automated calculation and control.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If the processing head rotates 360° about the C or A axis, then the processing head can cover the entire processing plane, but the laser focus forms a circular trajectory deviating from the preset focal position

Engineering Contradiction:

Improveprocessing coverageVSAvoidfocal point position accuracy

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The system performs preliminary calculation of the focal point trajectory during rotation. By computing the arc path formed by the focal point at different rotation angles, the system determines the deviation from the preset focal position in advance and calculates the optimal adjustment amount to compensate for this deviation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback by using the calculated arc path information to adjust the laser light path. The system feeds back the trajectory deviation data to the adjustment mechanism, enabling automatic compensation to keep the focal point at the preset position during rotation.

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If the laser light path is oblique to the optical axis of the focusing lens, then the AC-axis processing head can be used, but different rotation angles generate different focal points that deviate from the preset focal position

Engineering Contradiction:

Improveprocessing head flexibilityVSAvoidfocal point position consistency

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The system calculates the focal point positions at different rotation angles in advance, determining the arc path and computing the optimal adjustment amount before actual processing. This preliminary calculation ensures that even with oblique laser light paths, the focal point remains consistent at the preset position during rotation.

Inventive Principle:

Principle #10Preliminary action

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 precise adjustment of laser focal positions without the need for trial processes, ensuring a fixed focal point during rotations, thereby improving cutting quality and predictability on uneven surfaces.

Implementation Method 1

a laser light path in an optical axis L11 passing a focusing lens 10

Methodology Applied

Scientific EffectFocusing: Focusing

Implementation Method 2

applying a light modulator to adjust each of the at least two laser focal positions to the target laser focal position

Methodology Applied

Scientific EffectOptical modulation: Phase Modulation

Data Source

PatentUS20220212283A1Adjustment method of laser light path and adjustment device of laser light path

Publication Date: 2022.07.07 IND TECH RES INST

AI summary

An adjustment method of laser light path includes the steps of: having a laser light path to penetrate through a measuring device to obtain at least two laser focal positions of the laser light path, the at least two laser focal positions forming an arc path; applying a focal position-calculating device to calculate coordinate values of the at least two laser focal positions; based on the arc path and the coordinate values of the at least two laser focal positions to apply the focal position-calculating device to calculate a target laser focal position; and, based on the target laser focal position to apply a light modulator to adjust each of the at least two laser focal positions to the target laser focal position. In addition, an adjustment device of laser light path is also provided.