Laser Processing Head Coating Layout for Fine Contamination Detection
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Solution Overview
Problem
The outer peripheral surface and inner peripheral surface of the protective glass in existing laser processing heads have low reflectance, making it difficult for fine contamination on the front surface to be detected by the optical sensor, which hinders early contamination detection.
Innovation Solution
A reflective coating film is applied to the outer peripheral surface of the protective glass and the inner peripheral surface of the shield holder's opening, increasing reflectance and enhancing the detection of scattered light by the optical sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the outer peripheral surface and inner peripheral surface of the protective glass are left uncoated, then the structure remains simple and manufacturing is easier, but the reflectance is low and fine contamination cannot be detected
Solution Approach 1:
The patent applies a reflective coating film to the outer peripheral surface and inner peripheral surface of the protective glass, changing the optical parameter (reflectance) of these surfaces. This enables the optical sensor to detect scattered light from fine contamination on the front surface, thereby improving contamination detection precision without requiring fundamental structural changes
Solution Approach 2:
The reflective coating film acts as an intermediary element that enhances the interaction between light and contamination particles. By coating the peripheral surfaces, the system mediates the detection process, allowing scattered light from fine contamination to be reflected toward the optical sensor, thus improving detection capability
2Measurement precision
If a reflective coating film is applied to increase reflectance, then finer contamination can be detected, but the manufacturing process becomes more complex and costly
Solution Approach 1:
The patent modifies the optical parameter (reflectance) of the protective glass peripheral surfaces by applying a reflective coating film. This parameter change enables the detection of finer contamination that would otherwise be undetectable, accepting the trade-off of increased manufacturing complexity and cost for significantly improved detection precision
3Measurement precision
If the reflective coating film is applied to the outer peripheral surface, then scattered light detection is enhanced, but the opposed region facing the optical sensor must remain uncoated to allow light passage
Solution Approach 1:
The patent applies the reflective coating film selectively to specific regions of the protective glass - the outer peripheral surface and inner peripheral surface - while leaving the opposed region (facing the optical sensor) uncoated. This local differentiation of coating quality enables scattered light to be reflected toward the sensor while maintaining a clear light path from the contamination area to the sensor
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 configuration allows for the early detection of finer contamination on the protective glass, improving the accuracy of contamination detection and prompting timely intervention.
Implementation Method 1
the protective glass including a reflective coating film formed in a region in the outer peripheral surface except an opposed region facing the light receiving surface of the at least one optical sensor
Data Source
AI summary
Provided is a laser processing head including: shield holder (23) that has opening (23b) formed through shield holder (23) and optical sensor mounting hole (23c) formed in an inner peripheral surface of opening (23b); optical sensor (24) that has light receiving surface (24a) facing the inside of opening (23b) through optical sensor mounting hole (23c) and is attached to shield holder (23); and second protective glass (25) that has an outer peripheral surface facing light receiving surface (24a) of optical sensor (24) and is provided in opening (23b), second protective glass (25) transmitting a laser beam emitted by a laser oscillator to emit the laser beam toward a workpiece, and second protective glass (25) including reflective coating film (25a) formed in a region in the outer peripheral surface except an opposed region facing light receiving surface (24a) of optical sensor (24).