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WO1999046131A1 - Marqueur laser - Google Patents

Marqueur laser Download PDF

Info

Publication number
WO1999046131A1
WO1999046131A1 PCT/SG1998/000018 SG9800018W WO9946131A1 WO 1999046131 A1 WO1999046131 A1 WO 1999046131A1 SG 9800018 W SG9800018 W SG 9800018W WO 9946131 A1 WO9946131 A1 WO 9946131A1
Authority
WO
WIPO (PCT)
Prior art keywords
laser
marking
pigment
marked
plastics material
Prior art date
Application number
PCT/SG1998/000018
Other languages
English (en)
Inventor
Frank Enkelmann
Original Assignee
Siemens Audiologische Technik Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Audiologische Technik Gmbh filed Critical Siemens Audiologische Technik Gmbh
Priority to PCT/SG1998/000018 priority Critical patent/WO1999046131A1/fr
Priority to AU68625/98A priority patent/AU6862598A/en
Publication of WO1999046131A1 publication Critical patent/WO1999046131A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/267—Marking of plastic artifacts, e.g. with laser
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/44—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements
    • B41J2/442—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements using lasers

Definitions

  • This invention relates to a laser marker.
  • Laser markers for marking an article formed from ABS plastics material with, for example, a serial number and other manufacturing data, have been proposed. Such markers cause a laser beam to strike the article in a focusing zone and cause a thermal change in the plastics material, effectively burning the information into the material.
  • a suitable laser for such a technique is a 1064nm wavelength Nd:YAG laser with a suitable galvo scanner providing mirror-based laser direction.
  • a laser marker for marking a plastics material coloured with a pigment comprising a laser, means for directing the laser in a marking zone for receiving an object to be marked and wherein the laser is of a frequency to effect a photochemical colour change in the pigment, to provide the marking.
  • the laser is a frequency tripled Nd:YAG laser of a wavelength of 355 nanometres.
  • the laser light photo-chemically changes the pigment to cause a marking discolouration.
  • the invention is also suitable for use with ABS plastics and in contrast to the laser marking technique of the prior art, the ABS plastics material is not thermally changed, the marking being effected by means of photo-chemical change of the pigment contained therein.
  • a laser marker for marking a plastics material coloured with a pigment comprising a frequency tripled Nd:YAG laser and means for directing a laser in a marking zone for receiving an object to be marked.
  • a laser marker for marking a plastics material coloured with a pigment comprising a laser having a wavelength of substantially 355nm and means for directing a laser in a marking zone for receiving an object to be marked.
  • the invention extends to a product so marked.
  • the embodiment of Figure 1 includes a laser 100 which is mounted on a support frame 110 which supports, also, a controller 120 and laser power supply 130.
  • the laser head 100 is connected to a galvo scanner 140 for directing the laser in a marking zone 150.
  • a rotary table 160 is provided in the marking zone, the table being divided into two by a rotating partition 170.
  • a rotary head 180 is provided, the rotary head bearing a jig 190 on which an article 200 to be marked is mounted.
  • the frame 110 is covered to form, together with the rotating -partition 170, a safety cabinet which is sealed whenever the laser is in use.
  • the rotary table is turned through 180 degrees to allow another article 200 on the other half of the table to be so marked, the previously marked article being replaced by a further article 4 to be marked and so on.
  • the laser 100 is, specifically, a Nd:YAG frequency tripled laser having a wavelength of 351nm, with components of the galvo scanner 140 being appropriately chosen, in particular the directing mirrors which are required to have compatible mirror coatings as is known in the art.
  • the laser 100, galvo scanner 140 and rotary head 180 are software controlled by controller 120, in the manner known in the art. Specifically, the laser is directed by the galvo scanner 140 to provide a chosen marking, for example manufacturing information and/or a serial number, on the article 200.
  • a chosen marking for example manufacturing information and/or a serial number
  • the surface of the article 200 to be marked should be positioned at the focal point, or within a narrow range thereof, of the laser 100 within the marking zone 150, the position of the article 200 being controlled by the rotary head 180. In practice, the inventor has found that the satisfactory marking can be obtained provided the surface to be marked is within the range +. 3mm of the focal point .
  • the surface of the article to be marked is formed from plastics material containing a pigment .
  • the inventor has found that using a laser of such a high frequency causes marking by an effect different from that of the prior art, by discolouration of the pigment in the plastics material rather than by thermal 5 change of the plastics itself.
  • the applicant has found that titanium oxide pigment is suitable for this purpose.
  • the plastics material is preferably POM plastics but the invention works equally well with other plastics materials such as ABS.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Abstract

Cette invention se rapporte à un marqueur laser servant à marquer des matériaux plastiques colorés à l'aide d'un pigment et comprenant à cet effet: un laser (100), un moyen (140) servant à diriger le laser (100) dans une zone de marquage (150) destinée à recevoir l'objet (200) à marquer, le laser (100) étant réglé sur une fréquence qui entraîne un changement de couleur photochimique du pigment, afin de produire le marquage.
PCT/SG1998/000018 1998-03-13 1998-03-13 Marqueur laser WO1999046131A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/SG1998/000018 WO1999046131A1 (fr) 1998-03-13 1998-03-13 Marqueur laser
AU68625/98A AU6862598A (en) 1998-03-13 1998-03-13 A laser marker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SG1998/000018 WO1999046131A1 (fr) 1998-03-13 1998-03-13 Marqueur laser

Publications (1)

Publication Number Publication Date
WO1999046131A1 true WO1999046131A1 (fr) 1999-09-16

Family

ID=20429841

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SG1998/000018 WO1999046131A1 (fr) 1998-03-13 1998-03-13 Marqueur laser

Country Status (2)

Country Link
AU (1) AU6862598A (fr)
WO (1) WO1999046131A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0190997A2 (fr) * 1985-02-05 1986-08-13 Ciba-Geigy Ag Ecriture par laser sur systèmes pigmentés
DE4319190A1 (de) * 1992-06-25 1994-01-05 Basf Ag Verwendung von Mischungen aus Polyoxymethylenen und Polycarbonaten zur Herstellung von mittels energiereicher Strahlung beschriftbaren Formkörpern
WO1996035585A1 (fr) * 1995-05-10 1996-11-14 Dsm N.V. Procede de fabrication d'une marque coloree

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0190997A2 (fr) * 1985-02-05 1986-08-13 Ciba-Geigy Ag Ecriture par laser sur systèmes pigmentés
DE4319190A1 (de) * 1992-06-25 1994-01-05 Basf Ag Verwendung von Mischungen aus Polyoxymethylenen und Polycarbonaten zur Herstellung von mittels energiereicher Strahlung beschriftbaren Formkörpern
WO1996035585A1 (fr) * 1995-05-10 1996-11-14 Dsm N.V. Procede de fabrication d'une marque coloree

Also Published As

Publication number Publication date
AU6862598A (en) 1999-09-27

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