Laser Machining Head With Beam Mode Conversion at Transfer Position
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional laser machining techniques struggle to achieve high-quality machining by beam mode conversion, as they often result in a ring-shaped beam mode at positions away from the transfer position, leading to blurred edges and reduced machining quality.
Innovation Solution
A laser machining head is designed with a first lens group, a second lens group, a third lens group, a fourth lens group, and a light flux conversion optical element. This configuration allows for the conversion of beam modes by moving the first and third lens groups, enabling high-quality machining by maintaining image formation at the transfer position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a ring-shaped beam mode is obtained by beam mode conversion, then machining efficiency is improved, but the beam edge becomes blurred and machining quality deteriorates
Solution Approach 1:
The patent changes the optical parameters by introducing a light flux conversion optical element that converts the beam mode from a concentrated image to a ring-shaped distribution. This parameter change allows the beam to maintain a defined edge structure while achieving the desired ring-shaped intensity distribution, thereby improving machining efficiency without sacrificing edge sharpness and machining quality.
Solution Approach 2:
The light flux conversion optical element acts as an intermediary component between the light emitter and the workpiece. It transforms the beam mode in a controlled manner, creating a ring-shaped beam that maintains sharp edges. This intermediary element resolves the contradiction by enabling both high machining efficiency (through ring-shaped mode) and high machining quality (through sharp edges) simultaneously.
2Area of stationary object
If the workpiece position is shifted from the transfer position to increase beam diameter, then ring-shaped beam mode is achieved, but the laser beam edge becomes blurred
Solution Approach 1:
Instead of changing the workpiece position to achieve a larger beam diameter, the patent changes the beam mode parameter by introducing the light flux conversion optical element. This element creates a ring-shaped beam with a defined edge structure at the original transfer position, thereby increasing the effective beam area while maintaining sharp edges without requiring positional shifts.
Solution Approach 2:
The light flux conversion optical element performs preliminary transformation of the beam mode before the light reaches the workpiece. By converting the beam to a ring-shaped mode in advance, the system achieves the desired beam diameter and edge sharpness at the transfer position itself, eliminating the need for subsequent positional adjustments that would blur the edges.
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 solution achieves high-quality machining by effectively converting beam modes while maintaining image formation at the transfer position, thereby improving machining quality and productivity.
Implementation Method 1
a first lens group to which laser light diverging from a light emitter enters and configured to concentrate laser light
Implementation Method 2
a light flux conversion optical element disposed on an optical axis between the first lens group and the second lens group and configured to convert a beam mode of the laser light
Implementation Method 3
a fourth lens group to which the laser light having passed through the third lens group enters and configured to concentrate the laser light
Data Source
AI summary
A laser machining head includes: a first lens group in which laser light diverging from a light emitter enters and is concentrated; a second lens group to which the laser light having passed through the first lens group propagates; a third lens group that constitutes a lens group in which the laser light having passed through the second lens group propagates and forms an image of the light emitter; a fourth lens group in which the laser light having passed through the third lens group enters and is concentrated; a light flux conversion optical element that is disposed on an optical axis between the first lens group and the second lens unit and converts a beam mode of the laser light; a first mover that moves the first lens group in an optical axis direction; and a second mover that moves the third lens group in an optical axis direction.