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1. WO2006092035 - METHOD AND SYSTEM FOR LASER MARKING IN THE VOLUME OF GEMSTONES SUCH AS DIAMONDS

Publication Number WO/2006/092035
Publication Date 08.09.2006
International Application No. PCT/CA2005/001298
International Filing Date 26.08.2005
Chapter 2 Demand Filed 01.09.2006
IPC
A44C 17/00 2006.01
AHUMAN NECESSITIES
44HABERDASHERY; JEWELLERY
CJEWELLERY; BRACELETS; OTHER PERSONAL ADORNMENTS; COINS
17Gems or the like
B23K 26/00 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
26Working by laser beam, e.g. welding, cutting or boring
G01N 21/87 2006.01
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
84Systems specially adapted for particular applications
87Investigating jewels
C04B 41/53 2006.01
CCHEMISTRY; METALLURGY
04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
BLIME; MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
41After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
53involving the removal of part of the materials of the treated article
B44C 1/22 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
44DECORATIVE ARTS
CPRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
1Processes, not specifically provided for elsewhere, for producing decorative surface effects
22Removing surface-material, e.g. by engraving, by etching
B28D 5/00 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
28WORKING CEMENT, CLAY, OR STONE
DWORKING STONE OR STONE-LIKE MATERIALS
5Fine working of gems, jewels, crystals, e.g. of semiconductor material; Apparatus therefor
CPC
A44C 17/00
AHUMAN NECESSITIES
44HABERDASHERY; JEWELLERY
CJEWELLERY; BRACELETS; OTHER PERSONAL ADORNMENTS; COINS
17Gems or the like
A44C 27/00
AHUMAN NECESSITIES
44HABERDASHERY; JEWELLERY
CJEWELLERY; BRACELETS; OTHER PERSONAL ADORNMENTS; COINS
27Making jewellery or other personal adornments
B23K 2101/007
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
2101Articles made by soldering, welding or cutting
007Marks, e.g. trade marks
B23K 26/03
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
26Working by laser beam, e.g. welding, cutting or boring
02Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
03Observing, e.g. monitoring, the workpiece
B23K 26/032
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
26Working by laser beam, e.g. welding, cutting or boring
02Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
03Observing, e.g. monitoring, the workpiece
032using optical means
B23K 26/361
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
26Working by laser beam, e.g. welding, cutting or boring
36Removing material
361for deburring or mechanical trimming
Applicants
  • INTERNATIONAL GEMSTONE REGISTRY INC. [CA]/[CA] (AllExceptUS)
  • BARRON, Wes [CA]/[CA] (UsOnly)
  • BOURLIAGUET, Bruno [CA]/[CA] (UsOnly)
  • LEVESQUE, Marc [CA]/[CA] (UsOnly)
  • COURNOYER, Alain [CA]/[CA] (UsOnly)
  • CANTIN, Daniel [CA]/[CA] (UsOnly)
  • CHAMPAGNE, Yves [CA]/[CA] (UsOnly)
Inventors
  • BARRON, Wes
  • BOURLIAGUET, Bruno
  • LEVESQUE, Marc
  • COURNOYER, Alain
  • CANTIN, Daniel
  • CHAMPAGNE, Yves
Agents
  • SMITH, Paul
Priority Data
11/161,91722.08.2005US
60/656,91501.03.2005US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND SYSTEM FOR LASER MARKING IN THE VOLUME OF GEMSTONES SUCH AS DIAMONDS
(FR) METHODE ET SYSTEME DE MARQUAGE AU LASER DANS LE VOLUME DE PIERRES PRECIEUSES TELLES QUE DES DIAMANTS
Abstract
(EN)
A method and an apparatus for laser marking indicia in the volume of gemstones such as diamonds, the indicia being made up of a plurality of microscopic dot-shaped marks whose build-up can be initiated by exposing naturally-occurring internal defects or impurities in the volume of a gemstone to a tightly focused train of laser pulses. Authentication data is encoded in the gemstone from the relative spatial arrangement of the dot-shaped marks that form the indicium. Taking advantage of the presence of otherwise invisible defects in the gemstone allows for inscribing indicia with laser pulses carrying energies substantially lower than the threshold energy required for inscribing in the volume of a perfect gemstone material. The marking process is then much less susceptible to inflict damages to the surface of the gemstone, and the marking can be performed using a broad variety of femtosecond laser systems. The dot-shaped marks engraved at a depth below the surface of a gemstone can be made undetectable with the unaided eye or with a loupe by limiting their individual size to a few micrometres, while devising indicia made up of only a few marks. As a result, the marking does not detract from the appearance and value of the gemstone. The procedure for laser marking accounts for the random spatial distribution of the defects present in natural gemstones as well as for their strongly localized character. The presence of an indicium can be detected by using a dedicated optical reader that can be afforded by every jewellery store.
(FR)
L'invention porte sur une méthode et un système de marquage au laser dans le volume de pierres précieuses telles que des diamants, la marque étant constituée de points microscopiques obtenus par exposition des défauts ou impuretés naturels répartis dans le volume de la pierre à des trains d'impulsions laser finement localisés. Les données d'authentification sont codées dans la pierre par l'arrangement spatial relatif des points formant la marque. La présence de défauts, sinon invisibles, permet d'inscrire les marques avec des impulsions laser d'une énergie sensiblement moindre que celle requise pour une inscription dans le volume d'une pierre parfaite, le procédé d'inscription est nettement moins susceptible d'endommager la surface de la pierre, et le marquage peur se faire à l'aide d'une grande variété de systèmes laser femtosecondes. Les points gravés sous la surface de la pierre peuvent être indétectables à l'oeil nu ou avec une loupe si leur taille se limite à quelques micromètres et en produisant des marques de seulement quelques points. Il en résulte que le marquage ne nuit ni à l'apparence ni à la valeur de la pierre. Le procédé de marquage au laser tient compte de la distribution spatiale aléatoire des défauts présents dans les pierres naturelles et de leur caractère fortement localisé. La présence d'une marque peut être détectée à l'aide d'un lecteur optique dédié pouvant être acquis par tous les bijoutiers.
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