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1. WO2020003142 - THERMO OPTICAL CONTROL OF FOCUS POSITION OF AN ENERGY BEAM IN AN ADDITIVE MANUFACTURING APPARATUS

Publication Number WO/2020/003142
Publication Date 02.01.2020
International Application No. PCT/IB2019/055373
International Filing Date 26.06.2019
IPC
B PERFORMING OPERATIONS; TRANSPORTING
22
CASTING; POWDER METALLURGY
F
WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
3
Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor
10
Sintering only
105
by using electric current, laser radiation or plasma
[IPC code unknown for B29C 64/153]
[IPC code unknown for B33Y 50/02]
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
S
DEVICES USING STIMULATED EMISSION
3
Lasers, i.e. devices for generation, amplification, modulation, demodulation, or frequency-changing, using stimulated emission, of infra-red, visible, or ultra-violet waves
G PHYSICS
02
OPTICS
F
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1
Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
01
for the control of the intensity, phase, polarisation or colour
G PHYSICS
02
OPTICS
B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
7
Mountings, adjusting means, or light-tight connections, for optical elements
02
for lenses
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
S
DEVICES USING STIMULATED EMISSION
3
Lasers, i.e. devices for generation, amplification, modulation, demodulation, or frequency-changing, using stimulated emission, of infra-red, visible, or ultra-violet waves
10
Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
13
Stabilisation of laser output parameters, e.g. frequency, amplitude
[IPC code unknown for B33Y 30]
[IPC code unknown for B33Y 50]
B22F 3/105 (2006.01)
B29C 64/153 (2017.01)
B33Y 50/02 (2015.01)
H01S 3/00 (2006.01)
G02F 1/01 (2006.01)
G02B 7/02 (2006.01)
CPC
B22F 2003/1056
B22F 2003/1057
B22F 3/1055
B29C 64/153
B33Y 30/00
B33Y 50/02
Applicants
  • CSIR [ZA/ZA]; CSIR Campus, Meiring Naude Road, 0184 BRUMMERIA, ZA
  • AEROSUD INNOVATION CENTRE (PTY) LTD [ZA/ZA]; 520 van Ryneveld Avenue, Pierre van Ryneveld 0045 CENTURION, ZA
Inventors
  • STRAUSS, Hencharl; ZA
  • NAIDOO, Darryl; ZA
Agents
  • DAVIES, James, Hasely; ZA
Priority Data
2018/0430927.06.2018ZA
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) THERMO OPTICAL CONTROL OF FOCUS POSITION OF AN ENERGY BEAM IN AN ADDITIVE MANUFACTURING APPARATUS
(FR) COMMANDE THERMO-OPTIQUE DE LA POSITION DE FOCALISATION D'UN FAISCEAU D'ÉNERGIE DANS UN APPAREIL DE FABRICATION ADDITIVE
Abstract
(EN)
A control system for thermo optical control of focus position of an energy beam in an additive manufacturing apparatus has a first doped medium and a second doped medium, each of which is optically transparent and doped with a dopant. The first doped medium has a positive thermo-optical coefficient (dn/dT) and the second doped medium has a negative thermo-optical coefficient (dn/dT) and is in series with the first doped medium. An energy beam input or coupling is configured to generate or receive an energy beam that is required to be controlled, the energy beam being within a first wavelength range and directed towards the first and second doped mediums. An absorbed beam input or coupling is configured to generate or receive at least one absorbed beam in a second wavelength range which is different from the first wavelength range, the absorbed beam being directed towards the first and second doped mediums. The first and second doped mediums have a higher beam absorption characteristic in the second wavelength range than in the first wavelength range, causing the absorbed beam to have a higher absorption than the energy beam in the first and second doped mediums and the first and second doped mediums each have a coating which allows transmission at both the first and the second wavelength ranges.
(FR)
L'invention concerne un système de commande pour la commande thermo-optique de la position de focalisation d'un faisceau d'énergie dans un appareil de fabrication additive comprenant un premier milieu dopé et un second milieu dopé, chacun d'entre eux étant optiquement transparent et dopé au moyen d'un dopant. Le premier milieu dopé présente un coefficient thermo-optique positif (dn/dT) et le second milieu dopé présente un coefficient thermo-optique négatif (dn/dT) et est en série avec le premier milieu dopé. Une entrée ou un couplage de faisceau d'énergie est conçu pour générer ou recevoir un faisceau d'énergie qui doit être commandé, le faisceau d'énergie se trouvant dans une première plage de longueurs d'onde et étant dirigé vers les premier et second milieux dopés. Une entrée ou un couplage de faisceau absorbé est conçu pour générer ou recevoir au moins un faisceau absorbé dans une seconde plage de longueurs d'onde qui est différente de la première plage de longueurs d'onde, le faisceau absorbé étant dirigé vers les premier et second milieux dopés. Les premier et second milieux dopés ont une caractéristique d'absorption de faisceau supérieure dans la seconde plage de longueurs d'onde que dans la première plage de longueurs d'onde, amenant le faisceau absorbé à avoir une absorption plus élevée que le faisceau d'énergie dans les premier et second milieux dopés et les premier et second milieux dopés ayant chacun un revêtement qui permet la transmission aussi bien dans la première que dans la seconde plage de longueurs d'onde.
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