Laser marker system

• US 5,294,774 A
• Filed: 08/03/1993
• Issued: 03/15/1994
• Est. Priority Date: 08/03/1993
• Status: Expired

• Current Assignee: Videojet Systems International Incorporated (Danaher Corporation)
• Original Assignee: Videojet Systems International Incorporated (Danaher Corporation)
• Inventors: Stone, J. James
• Primary Examiner(s): Albritton, C. L.
• Application Number:
  US08/103,061
• Time in Patent Office: 224 Days
• Field of Search: 219/121.7, 219/121.71, 219/121.74, 219/121.75, 219/121.77
• US Class Current: 219/121.77
• CPC Class Codes: B23K 26/06 Shaping the laser beam, e.g. by masks or multi-focusing
• CPC Class Codes: B23K 26/0604 by a combination of beams
• CPC Class Codes: B23K 26/0608 in the same heat affected zone [HAZ] B23K26/0613, B23K26/0619 take precedence
• CPC Class Codes: B23K 26/064 by means of optical elements, e.g. lenses, mirrors or prisms
• CPC Class Codes: B23K 26/0643 comprising mirrors
• CPC Class Codes: B23K 26/0648 comprising lenses
• CPC Class Codes: B23K 26/0665 by beam condensation on the workpiece, e.g. for focusing

Abstract

A laser marker system for marking indicia onto a substrate includes an exit lens having a focal length and a single laser source. The surface of the substrate to be marked is positioned generally at the focal plane of the lens. The single laser source is arranged so that its energy output beams are oriented in a generally parallel relationship. The single laser source includes segmented reflecting means for generating a plurality of output energy beams to create a column of spots on the substrate with a higher resolution. The segmented reflecting means is comprised of a back-reflecting mirror which is formed of a plurality of different mirror segments. A device is provided for moving each of the plurality of different mirror segments between a lasing position and a non-lasing position to vary the number of output energy beams and thus the number of spots on the substrate.

Claims

1. A laser marker system for marking indicia onto a substrate, comprising:

an exit lens having a focal length, the surface of the substrate to be marked being positioned generally at the focal plane of the lens;

a single laser source arranged so that its energy output beams are oriented in a generally parallel relationship; and

said single laser source including segmented reflecting means for generating a plurality of output energy beams to create a column of spots on the substrate with a higher resolution.

2. A laser marker system as claimed in claim 1, wherein said segmented reflecting means is comprised of a back-reflecting mirror which is formed of a plurality of different mirror segments.

3. A laser marker system as claimed in claim 2, further comprising means for moving each of said plurality of different mirror segments between a lasing position and a non-lasing position to vary the number of output energy beams and thus the number of spots on the substrate.

4. A laser marker system as claimed in claim 2, wherein said plurality of mirror segments are located on an end of an enclosure containing a gas-filled chamber.

5. A laser marker system as claimed in claim 2, wherein said plurality of mirror segments are located outside of an enclosure containing a gas-filled chamber.

6. A laser marker system as claimed in claim 5, wherein an IR window is positioned on the end of the enclosure containing the gas-filled chamber.

7. A laser marker system as claimed in claim 1, wherein said single laser source is formed in a multi-cavity block so as to define multiple laser channels.

8. A laser marker system as claimed in claim 7, further comprising a plurality of barriers in which each is disposed between adjacent channels so as to reduce interaction of one energy beam with another one.

9. A laser marker system as claimed in claim 3, wherein said means for moving each of said plurality of different mirror segments includes means for rotating said mirror segments.

10. A laser marker system as claimed in claim 3, wherein said means for moving each of said plurality of different mirror segments includes means for flexing said mirror segments.

11. A laser marker system for marking indicia onto a substrate, comprising:

a single laser source arranged so that its energy output beams are oriented in a generally parallel relationship;

a delivery tube through which the output beam travels;

an exit lens disposed at the end of the delivery tube remote from said plurality of lasers and onto which the energy output beams are directed for focusing onto said substrate positioned at the focal plane of the lens; and

said single laser source including segmented reflecting means for generating a plurality of output energy beams to create a column of spots on the substrate with a higher resolution.

12. A laser marker system as claimed in claim 11, wherein said segmented reflecting means is comprised of a back reflecting mirror which is formed of a plurality of different mirror segments.

13. A laser marker system as claimed in claim 12, further comprising means for moving each of said plurality of different mirror segments between a lasing position and a non-lasing position to vary the number of output energy beams and thus the number of spots on the substrate.

14. A laser marker system as claimed in claim 12, wherein said plurality of mirror segments are located on an end of an enclosure containing a gas-filled chamber.

15. A laser marker system as claimed in claim 12, wherein said plurality of mirror segments are located outside of an enclosure containing a gas-filled chamber.

16. A laser marker system as claimed in claim 15, wherein an IR window is positioned on the end of the enclosure containing the gas-filled chamber.

17. A laser marker system as claimed in claim 11, wherein said single laser source is formed in a multi-cavity block so as to define multiple laser channels.

18. A laser marker system as claimed in claim 17, further comprising a plurality of barriers in which each is disposed between adjacent channels so as to reduce interaction of one energy beam with another one.

19. A laser marker system as claimed in claim 13, wherein said means for moving each of said plurality of different mirror segments includes means for rotating said mirror segments.

20. A laser marker system as claimed in claim 13, wherein said means for moving each of said plurality of different mirror segments includes means for flexing said mirror segments.

21. A laser marker system for generating a plurality of coherent energy beams to mark indicia onto a substrate, comprising:

an exit lens having a focal length, the surface of the substrate to be marked being positioned generally at the focal plane of the lens;

a single laser source arranged so that its energy output beams are oriented in a generally parallel relationship; and

said single laser source directed at a segmented reflecting means for generating a plurality of output energy beams each said beams of sufficient energy to create a spot on the substrate.