Mirror Arrangement for Continuous Laser Heating

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Solution Overview

Problem

Current industrial heating systems for thermal deformation processes, such as bottle blowing, are inefficient and costly due to the use of high-power laser diodes, which require sophisticated mounting and cooling techniques, and disrupt continuous product flow with stepwise processing.

Innovation Solution

A system utilizing a mirror arrangement with multiple reflections of laser light along a production line, allowing for continuous product flow and reducing the need for high-power laser diodes by using lower-power VCSELs or VECSELs, which are more economical and efficient in heating objects through multiple reflections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If high power laser diode bars are used to provide sufficient heating power, then the heating effectiveness is improved, but the system cost and complexity increase significantly due to sophisticated mounting and cooling techniques

Engineering Contradiction:
Improveheating powerVSAvoidmounting and cooling system complexity
Core Design Contradiction:
PowerVSDevice complexity

Solution Approach 1:

The patent segments the heating function by using multiple low-power VCSELs instead of a single high-power laser diode bar. Each VCSEL operates independently at a lower power level, eliminating the need for complex cooling and mounting systems while collectively providing sufficient heating power through distributed radiation sources

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent replaces expensive high-power laser diode bars with cheaper VCSELs that have simpler cooling requirements. While individual VCSELs have lower power output, their lower cost and reduced cooling needs make the overall system more economical, trading component lifespan for system affordability and simplicity

Inventive Principle:
Principle #27Cheap short-living objects (Disposable)

2Loss of energy

If the PET form is located in the centre of the reflector arrangement to make full use of reflected light, then the heating efficiency is improved, but the continuous product flow is disrupted requiring stepwise processing

Engineering Contradiction:
Improvelight reflection utilization efficiencyVSAvoidproduct flow continuity
Core Design Contradiction:
Loss of energyVSProductivity

Solution Approach 1:

The patent transitions from a two-dimensional star-shaped reflection path to a three-dimensional configuration where VCSELs are distributed around the PET form's equator. This spatial redistribution allows light to travel in multiple directions simultaneously, enabling both high reflection utilization and continuous product flow without requiring the PET form to be stationary at a specific location

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent implements continuous heating by distributing multiple VCSELs around the PET form, ensuring that as the PET form moves through the reflector arrangement, it continuously receives heated radiation from multiple angles without interruption. This eliminates the stepwise processing requirement while maintaining energy efficiency

Inventive Principle:
Principle #20Continuity of useful action

3Manufacturing precision

If the main direction of light is directed at an angle to the production line to enable multiple reflections, then the heating uniformity is improved, but the system complexity increases compared to direct illumination

Engineering Contradiction:
Improveheating uniformityVSAvoidmirror arrangement complexity
Core Design Contradiction:
Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent employs a reflector arrangement with curved mirror surfaces that naturally guide light from VCSELs positioned at an angle to the production line. The curved geometry creates multiple reflection paths that converge on the PET form, achieving uniform heating distribution without requiring complex angular adjustments or multiple discrete mirror components

Inventive Principle:
Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent designs the mirror arrangement to simultaneously perform multiple functions: directing light from angled VCSELs, creating multiple reflection paths for uniform heating, and accommodating the continuous movement of PET forms. This multi-functional design reduces overall system complexity compared to specialized components for each function

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

This solution enables uninterrupted continuous product flow while reducing the cost and complexity of heating systems by efficiently using lower-power lasers, achieving uniform heating and high energy density through intelligent light reflection and absorption.

Implementation Method 1

the light subsequently undergoes multiple reflections between the mirror surfaces so that a series of multiple reflections of the light travels in the transport direction

Methodology Applied
Scientific EffectLight reflection: Reflection

Implementation Method 2

heats the objects being transported between the mirrors

Methodology Applied
Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentEP2094460B1System for and method of heating objects in a production line
Publication Date: 2011.07.13 PHILIPS INTPROP & STANDARDS GMBH
  • EP2094460B1 patent drawingFigure 1
  • EP2094460B1 patent drawingFigure 2
  • EP2094460B1 patent drawingFigure 3~4

AI summary

A system and method (10) for heating objects (O) during a thermal treatment process in a production line (P) is described. The system (10) comprises a transport system (11), a mirror arrangement (201, 202, 203, 204, 205, 206) comprising a first mirror surface (21, 21', 21'') and a second mirror surface (22, 22', 22'') arranged at opposite sides, so that the objects (0) may be transported between the mirror surfaces (21, 22, 21', 22', 21'', 22'') along the production line and a radiation device (30) comprising a number of lasers for generating light (L). The radiation device (30) and the mirror arrangement (201, 202, 203, 204, 205, 206) are constructed such that the main direction (R) of light (L) that enters the mirror arrangement (201, 202, 203, 204, 205, 206) is directed towards the first mirror surface (21, 21', 21'') at an angle to the production line (P), and the light (L) subsequently undergoes multiple reflections between the mirror surfaces (21, 22, 21', 22', 21'', 22'') so that a series of multiple reflections of the light (L) travels in the transport direction (OT) along at least a section of the mirror surface (21, 22, 21', 22', 21'', 22'') or travels against the transport direction (OT) along at least a section of the mirror surface (21, 22, 21', 22', 21'', 22'') and heats the objects (0) being transported between the mirror surfaces (21, 22, 21', 22', 21'', 22'').