Laser Hood Nozzle Layout for Protective Glass Cleanliness
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Solution Overview
Problem
In existing laser processing devices, the nozzle is positioned at the uppermost portion of the hood, leading to a single gas flow direction that agitates and lifts particles generated during processing, causing them to adhere to the protective glass and attenuate the laser beam.
Innovation Solution
The nozzle is disposed at the central portion of the tubular portion in the axial direction, forming multiple layers of gas flows to suppress particle adhesion to the protective glass, ensuring the laser beam's transmission is not attenuated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the nozzle is positioned at the uppermost portion of the hood, then the gas supply structure is simplified, but particles generated during processing are agitated and lifted, causing adhesion to the protective glass and laser beam attenuation
Solution Approach 1:
The nozzle is repositioned from the uppermost portion to the central portion of the hood in the axial direction. This positional change in the vertical dimension creates multiple gas flow layers (upper and lower flows) that move in opposite directions, preventing particles from reaching the protective glass while maintaining structural simplicity
Solution Approach 2:
The gas flow is segmented into multiple layers by positioning the nozzle centrally. The gas divides into an upper flow moving upward and a lower flow moving downward, creating distinct flow zones that collectively prevent particle migration to the glass surface
2Device complexity
If the nozzle is positioned at the uppermost portion of the hood, then the structure is simpler, but particles adhere to the protective glass reducing transmission quality
Solution Approach 1:
By changing the nozzle's axial position from the upper end to the center of the hood, the gas flow pattern transitions from a single upward flow to multiple layered flows. This dimensional repositioning creates downward flows that prevent particle adhesion to the protective glass, thereby maintaining laser beam transmission quality without complicating the structure
3Device complexity
If gas flows in a single direction from the upper nozzle, then the gas supply system is simpler, but particles are lifted and cause laser beam attenuation
Solution Approach 1:
The gas flow is divided into multiple segments or layers by introducing the gas at the central position. This creates distinct upper and lower flow regions with different flow directions, preventing the unified upward flow that would carry particles to the protective glass
Solution Approach 2:
The gas flow pattern is transformed from a single-dimensional upward flow to a multi-layered flow structure with both upward and downward components. This dimensional complexity in flow pattern prevents particle migration while the overall system remains simple
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 configuration effectively suppresses particle adhesion to the protective glass, maintaining the laser beam's intensity by creating multiple gas flow layers that prevent particle migration to the glass surface.
Implementation Method 1
a transmissive portion that is provided at one end of the tubular portion in the axial direction and that transmits a laser beam
Implementation Method 2
a nozzle that supplies a gas into the tubular portion, in which the nozzle is disposed at a central portion of the tubular portion in the axial direction and a part of the tubular portion in a circumferential direction
Data Source
AI summary
A hood for a laser device includes: a tubular portion that extends along an axial direction; a transmissive portion that is provided at one end of the tubular portion in the axial direction and that transmits a laser beam; an opening end that is provided at the other end of the tubular portion in the axial direction; and a nozzle that supplies a gas into the tubular portion, in which the nozzle is disposed at a central portion of the tubular portion in the axial direction and a part of the tubular portion in a circumferential direction.