Method of cutting glass with a laser and an article made therewith

• US 4,467,168 A
• Filed: 04/01/1981
• Issued: 08/21/1984
• Est. Priority Date: 04/01/1981
• Status: Expired due to Fees

• Current Assignee: Creative Glassworks International 506 N B St Fairfield IA
• Original Assignee: Creative Glassworks International Inc.
• Inventors: Morgan, George M., Hinkens, Dale R.
• Primary Examiner(s): Albritton, C. L.
• Application Number:
  US06/249,854
• Time in Patent Office: 1,238 Days
• Field of Search: 219/121 LG, 219/121 LN, 219/121 L, 219/121 LM, 65/105, 65/112
• US Class Current: 219/121.67
• CPC Class Codes: C03B 33/027 Scoring tool holders; Driving mechanisms therefor
• CPC Class Codes: C03B 33/04 Cutting or splitting in curves, especially for making spectacle lenses
• CPC Class Codes: C03B 33/082 using a focussed radiation beam, e.g. laser C03B33/0855 takes precedence

Abstract

A method of cutting glass with a laser. The glass is superposed a suitable support and a laser beam is directed onto the glass. The laser beam is focused to a point disposed at or about the surface of the glass. The focused laser beam vaporizes a first thickness of glass, less than the entire thickness, and simultaneously heats the remaining thickness above the annealing temperature of the glass. A jet of gas incident upon the laser focal point removes the heated and vaporized glass proximate the focal point to create a hole through the glass. By effecting movement between the glass and the laser and gas jet at a predetermined rate, the glass is cut. Also disclosed is an article including a unitary first sheet of glass having at least one complimental opening of predetermined configuration that does not extend to the edge of the glass and is cut by a laser. One or more complimentary glass inserts coplanar with the first glass are disposed within the opening of the first glass, defining a groove therebetween. A securing means is disposed in the groove to secure the complimentary pieces of glass in fixed edge to edge relationship.

Claims

1. Method of cutting glass having a predetermined thickness with laser means having a laser beam output, said method comprising

superposing the glass in predetermined spaced relationship with respect to a support means;

directing laser means so that a laser beam generated thereby is incident upon said glass, said laser means having a predetermined energy output;

focusing said laser beam to a focal point proximate the surface of said glass to locally heat said glass proximate said focal point;

vaporizing a first thickness of said glass proximate said laser focal point, said first thickness being less than the total glass thickness;

simultaneously with said vaporizing, heating the remaining thickness of said glass proximate said laser focal point, said remaining thickness being heated above its annealing temperature;

directing a jet of gas so that it is incident upon the proximity of said laser focal point, said jet cooperating with said beam to remove said vaporized and said heated glass proximate said laser focal point to create a hole through said glass; and

effecting movement between said glass and said laser focal point and gas jet along a predetermined path at a predetermined rate, maintaining said focal point at or about the surface of said glass during any movement, thereby defining a cut through the entire thickness of said glass.

2. A method of cutting glass as in claim 1 further comprising selectively controlling said laser means energy output.

4. An article as in claim 1 wherein said glass is a unitary sheet.

13. The method of claim 1 wherein the step of directing laser means comprises orienting the laser beam to be substantially perpendicular to the glass.

14. The method of claim 1 wherein the step of directing laser means further comprises generating a laser beam having a multi-mode energy distribution.

15. The method of claim 1 wherein the step of directing laser means further comprises generating a laser beam having a single mode energy distribution.

16. The method of claim 1 wherein the step of vaporizing a first thickness of said glass comprises vaporizing approximately 5 to 30 percent of the total glass thickness.

17. The method of claim 1 wherein the step of directing a jet of gas comprises directing the jet of gas downwardly onto the glass.

18. The method of claim 1 wherein the step of directing a jet of gas comprises directing the jet of gas substantially parallel to and coincident with said laser beam.

19. The method of claim 1 wherein the step of effecting movement between said glass and said laser focal point and gas jet comprises moving said sheet of glass while the laser means and gas jet are stationary.

20. The method of claim 1 wherein said step of effecting movement between said glass and said laser focal point and gas jet comprises moving said laser means and gas jet while said sheet of glass is stationary.

3. An article of manufacture comprising glass having at least one cut of predetermined configuration and length, each cut having been made by

superposing the glass in predetermined spaced relationship with respect to a support means;

directing laser means so that a laser beam generated thereby is incident upon said glass, said laser means having a predetermined energy output;

focusing said laser beam to a focal point proximate the surface of said glass to locally heat said glass proximate said focal point;

vaporizing a first thickness of said glass proximate said laser focal point, said first thickness being less than the total glass thickness;

simultaneously with said vaporizing, heating the remaining thickness of said glass proximate said laser focal point, said remaining thickness being heated above its annealing temperature;

directing a jet of gas so that it is incident upon the proximity of said laser focal point, said jet cooperating with said beam to remove said vaporized and said heated glass proximate said laser focal point to create a hole through said glass; and

effecting movement between said glass and said laser focal point and said gas jet along a predetermined path at a predetermined rate, maintaining said focal point at or about the surface of said glass during any movement, thereby defining a cut through the entire thickness of said glass.

5. An article as in claim 3 or claim 4 wherein at least one cut is within the perimeter of said glass without extending to an edge thereof.

6. An article as in claim 3 or claim 4 wherein at least one cut begins at one location within the perimeter of said glass and terminates at a different location within the perimeter of said glass.

7. An article as in claim 3 or claim 4 wherein at least one cut begins and terminates at the same location within the perimeter of said glass, said cut defining at least one opening in said glass.

8. An article of manufacture comprising

a first unitary sheet of glass defining at least one complimental opening of predetermined configuration that does not extend to the edge of said sheet of glass, said opening created by cutting said glass with laser means;

at least one second sheet of glass coplanar with said first sheet and disposed within at least one of said complimental openings of said first sheet, said second sheet substantially complimentary to said opening in said first sheet, said opening of said first sheet and the periphery of said second sheet defining a groove therebetween; and

securing means disposed substantially within said groove between said first sheet and said second sheet for securing in fixed edge to edge relationship said first sheet and said second sheet.

9. An article as in claim 8 wherein said second sheet of glass comprises a plurality of coplanar sheets of glass secured together in fixed edge to edge relationship.

10. An article as in claim 8 or claim 9 wherein said securing means comprises a photopolymer material.

11. An article as in claim 10 wherein said epoxy is curable by ultraviolet radiation.

12. An article as in claim 8 or claim 9 wherein said securing means is metallic.