Portable Laser Marking Head Pressure Control for Defect Detection

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing laser marking devices face challenges in detecting surface defects and ensuring proper positioning, as well as efficiently removing waste fumes during the marking process, leading to safety concerns and increased production costs.

Innovation Solution

A portable laser marking device with a control system that generates a higher pressure inside the marking chamber than atmospheric pressure to remove fumes and detect defects by maintaining a constant internal pressure, ensuring the surface is correctly positioned and free of defects before allowing laser emission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a vacuum chamber is used to seal the marking head and surface, then surface defects can be detected, but the device complexity and production costs increase significantly

Engineering Contradiction:

Improvesurface defect detectionVSAvoidvacuum chamber structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Instead of creating a vacuum to detect defects, the patent applies overpressure (positive pressure) to achieve the same detection goal. The inverted approach uses pressurized air to force its way through defects, making detection simpler and more cost-effective while avoiding complex vacuum chamber structures.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent uses pneumatic pressure (overpressure) to detect surface defects by measuring pressure changes when air escapes through defects. This pneumatic approach replaces the vacuum chamber system, achieving defect detection through simpler pressure measurement technology.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Reliability

If a vacuum chamber is used to seal the marking head and surface, then surface defects can be detected, but the ease of manufacture decreases due to implementation difficulties

Engineering Contradiction:

Improvesurface defect detectionVSAvoidvacuum chamber implementation

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent inverts the vacuum approach by using overpressure instead. This inversion dramatically simplifies manufacturing, as overpressure systems are easier to implement and maintain than vacuum chambers, directly improving ease of manufacture while preserving defect detection capability.

Inventive Principle:

Principle #13The other way round (Inversion)

3Object-generated harmful factors

If a sealing assembly with vacuum chamber is used, then fume removal is enabled, but the device complexity and production costs increase

Engineering Contradiction:

Improvefume removalVSAvoidsealing assembly structure

Core Design Contradiction:

Object-generated harmful factorsVSDevice complexity

Solution Approach 1:

Instead of using vacuum to remove fumes, the patent uses overpressure to actively push fumes out through designated exhaust paths. This inverted approach simplifies the sealing assembly by eliminating the need for vacuum pumps and complex sealing mechanisms, reducing device complexity while maintaining effective fume removal.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent employs pneumatic overpressure to drive fume removal, replacing complex vacuum-based sealing assemblies. The pressurized air system simultaneously achieves defect detection and fume removal, reducing overall device complexity and production costs.

Inventive Principle:

Principle #29Pneumatics and hydraulics

4Measurement precision

If pressure sensors are used to detect surface defects, then measurement precision is improved, but the device complexity increases

Engineering Contradiction:

Improvesurface defect detectionVSAvoidsensor system

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The overpressure system serves multiple functions simultaneously: it detects surface defects, removes fumes, and verifies surface positioning. This multi-functionality reduces the need for separate sensor systems, lowering device complexity while maintaining measurement precision through the unified pressure measurement approach.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 solution enhances safety and efficiency by simultaneously verifying surface integrity and removing fumes, preventing unwanted laser beam scattering and maintaining a stable marking process, thus improving the adaptability and cost-effectiveness of the device.

Implementation Method 1

the control system is constructed to generate a higher pressure inside the marking chamber than atmospheric pressure so as to allow the removal of waste fumes

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient