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Patent · US9938180B2 · B2 · US

Methods of cutting glass using a laser

(11) Publication number
US9938180B2
(21) Application number
13/836,717
(22) Filing date
2013-03-15
(30) Priority date
2012-06-05
(43) Publication date
2018-04-10
(45) Date of grant
2018-04-10
(51) IPC
B23K 103/00; B23K 26/00; B23K 26/08; B23K 26/364; B23K 26/53; B23K 26/57; C03B 33/02
(52) CPC
  • C03B Manufacture, shaping, or supplementary processes: 33/0222
  • B23K Soldering or unsoldering; welding; cladding or plating by soldering or welding; cutting by applying heat locally, e.g. flame cutting; working by laser beam: 2103/54, 2203/54, 26/0006, 26/0057, 26/0063, 26/0087, 26/0869, 26/359, 26/364, 26/53, 26/57
  • B65G Transport or storage devices, e.g. conveyors for loading or tipping, shop conveyor systems or pneumatic tube conveyors: 2249/04
  • Y10T Technical subjects covered by former us classification: 428/24471
(73) Assignee
Corning Inc
(72) Inventors
Anatoli Anatolyevich Abramov; Naiyue Zhou
(54) Title
Methods of cutting glass using a laser
(57) Abstract

A method of cutting a glass article includes translating a laser beam relative to a first surface of the glass article. The laser beam includes a beam waist having a center. The center of the beam waist of the laser beam is positioned at or below a second surface of the glass article. The laser beam creates a plurality of defects along a score line in the glass article such that the plurality of defects extends a distance into the glass article, and at least some individual defects of the plurality of defects are non-orthogonal to the first surface of the glass article and are biased in a direction of translation of the laser beam. Glass articles having edge defects are also disclosed.

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Claims (12)

  1. A method of scoring a glass article comprising: translating a laser beam relative to a first surface of the glass article, the laser beam comprising a beam waist having a center, wherein: the center of the beam waist of the laser beam is positioned at or below a second surface of the glass article such that the laser beam passes through a thickness of the glass article; the laser beam operates at a wavelength from 350 nanometers to 619 nanometers and has a pulse duration from about 1 nanosecond to about 50 nanoseconds; the laser beam creates a plurality of defects in the form of voids or cracks along a score line in the glass article such that the plurality of defects extends a distance into the glass article from the second surface; and at least some individual defects of the plurality of defects are non-orthogonal to the first surface of the glass article and are biased in a direction of translation of the laser beam wherein the glass article is an ion-exchanged glass article having a first strengthened surface layer and a second strengthened surface layer under a compressive stress and extending from a surface of the ion-exchanged glass article to a depth of layer, and a central region between the first strengthened surface layer and the second strengthened surface layer that is under tensile stress, and the plurality of defects extends a distance greater than the depth of layer.
  2. The method of claim 1, wherein the laser beam is oriented orthogonally to the first surface of the glass article.
  3. The method of claim 1, wherein the laser beam is translated relative to the glass article at a speed S greater than about 20 millimeters per second.
  4. The method of claim 1, wherein the laser beam is translated relative to the glass article at a speed S greater than about 200 millimeters per second.
  5. The method of claim l, wherein the central region has a tensile stress between about 20 and about 30 megapascals, and the plurality of defects extends through about half of the thickness of the ion-exchanged glass article.
  6. The method of claim 1, wherein the central region has a tensile stress greater than about 40 megapascals, and a majority of a length of the plurality of defects is within the first or second strengthened layer.
  7. The method of claim 1, wherein the plurality of defects creates a crack that propagates within the glass article such that the glass article separates along the score line into one or more separated glass articles.
  8. The method of claim 7, further comprising finishing one or more edges of the one or more separated glass articles such that the one or more edges have a surface roughness below about 100 μm root mean squared.
  9. A method of separating an ion-exchanged glass article comprising: translating a laser beam relative to a first surface of the ion-exchanged glass article, the laser beam comprising a beam waist having a center, wherein: the ion-exchanged glass article comprises a first strengthened surface layer and a second strengthened surface layer under a compressive stress and extending from a surface of the ion-exchanged glass article to a depth of layer, and a central region between the first strengthened surface layer and the second strengthened surface layer that is under tensile stress; the center of the beam waist of the laser beam is positioned at or below a second surface of the ion-exchanged glass article such that the laser beam passes through a thickness of the ion-exchanged glass article; the laser beam operates at a wavelength from 350 nanometers to 619 nanometers and has a pulse duration from about 1 nanosecond to about 50 nanoseconds; the laser beam ablates the second surface of the ion-exchanged glass article to create a plurality of defects in the form of voids or cracks that extend from ablated regions on the second surface of the ion-exchanged glass article; the plurality of defects defines one or more score lines along the ion-exchanged glass article; at least some individual defects of the plurality of defects are non-orthogonal to the first surface of the ion-exchanged glass article and are biased in a direction of translation of the laser beam; at least a portion of the plurality of defects extends a distance greater than the depth of layer of the ion-exchanged glass article; and the plurality of defects creates a crack that propagates within the ion-exchanged glass article such that the ion-exchanged glass article separates along the one or more score lines.
  10. The method of claim 9, wherein the crack does not propagate ahead of the laser beam in a direction of translation of the laser beam.
  11. The method of claim 9, wherein individual defects of the plurality of defects are discrete with respect to one another prior to separation of the ion-exchanged glass article.
  12. The method of claim 1, wherein the plurality of defects extends into the distance of the glass article without changing a vertical position of the beam waist.

Description

The present specification generally relates to methods of cutting glass using a laser and, more particularly, methods of cutting glass using a laser to introduce defects that extend from a surface of a glass article.

Glass articles are used in a variety of industries including the electronics industry where glass is used to cover displays. Examples of such applications include Liquid Crystal Displays and Light Emitting Diode displays, for example, computer monitors, televisions, and handheld devices. Conventionally, glass has been produced in large sheets and is scored using a mechanical scoring wheel or a laser. After being scored, an external force is applied to the glass sheet to break the glass along the score line. With the glass portioned into smaller sizes, the glass partitions undergo further processing including, for example, edge polishing and/or a chemical strengthening process.

Processing glass according to the conventional method has proven burdensome. First, when glass is broken along the score line by an application of force, the application of force tends to damage the glass portions, which may increase the scrap rate. Further, for chemically strengthened glass, introducing the smaller, separated glass articles to a chemical strengthening process after the cutting process decreases throughput, as the smaller glass articles require increased operator intervention as compared to processing a larger mother glass sheet.

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Record as JSON 
{
  "publication_number": "US9938180B2",
  "country": "US",
  "kind": "B2",
  "title": "Methods of cutting glass using a laser",
  "abstract": "A method of cutting a glass article includes translating a laser beam relative to a first surface of the glass article. The laser beam includes a beam waist having a center. The center of the beam waist of the laser beam is positioned at or below a second surface of the glass article. The laser beam creates a plurality of defects along a score line in the glass article such that the plurality of defects extends a distance into the glass article, and at least some individual defects of the plurality of defects are non-orthogonal to the first surface of the glass article and are biased in a direction of translation of the laser beam. Glass articles having edge defects are also disclosed.",
  "claims": [
    "1. A method of scoring a glass article comprising: translating a laser beam relative to a first surface of the glass article, the laser beam comprising a beam waist having a center, wherein: the center of the beam waist of the laser beam is positioned at or below a second surface of the glass article such that the laser beam passes through a thickness of the glass article; the laser beam operates at a wavelength from 350 nanometers to 619 nanometers and has a pulse duration from about 1 nanosecond to about 50 nanoseconds; the laser beam creates a plurality of defects in the form of voids or cracks along a score line in the glass article such that the plurality of defects extends a distance into the glass article from the second surface; and at least some individual defects of the plurality of defects are non-orthogonal to the first surface of the glass article and are biased in a direction of translation of the laser beam wherein the glass article is an ion-exchanged glass article having a first strengthened surface layer and a second strengthened surface layer under a compressive stress and extending from a surface of the ion-exchanged glass article to a depth of layer, and a central region between the first strengthened surface layer and the second strengthened surface layer that is under tensile stress, and the plurality of defects extends a distance greater than the depth of layer.",
    "2. The method of claim 1, wherein the laser beam is oriented orthogonally to the first surface of the glass article.",
    "3. The method of claim 1, wherein the laser beam is translated relative to the glass article at a speed S greater than about 20 millimeters per second.",
    "4. The method of claim 1, wherein the laser beam is translated relative to the glass article at a speed S greater than about 200 millimeters per second.",
    "5. The method of claim l, wherein the central region has a tensile stress between about 20 and about 30 megapascals, and the plurality of defects extends through about half of the thickness of the ion-exchanged glass article.",
    "6. The method of claim 1, wherein the central region has a tensile stress greater than about 40 megapascals, and a majority of a length of the plurality of defects is within the first or second strengthened layer.",
    "7. The method of claim 1, wherein the plurality of defects creates a crack that propagates within the glass article such that the glass article separates along the score line into one or more separated glass articles.",
    "8. The method of claim 7, further comprising finishing one or more edges of the one or more separated glass articles such that the one or more edges have a surface roughness below about 100 μm root mean squared.",
    "9. A method of separating an ion-exchanged glass article comprising: translating a laser beam relative to a first surface of the ion-exchanged glass article, the laser beam comprising a beam waist having a center, wherein: the ion-exchanged glass article comprises a first strengthened surface layer and a second strengthened surface layer under a compressive stress and extending from a surface of the ion-exchanged glass article to a depth of layer, and a central region between the first strengthened surface layer and the second strengthened surface layer that is under tensile stress; the center of the beam waist of the laser beam is positioned at or below a second surface of the ion-exchanged glass article such that the laser beam passes through a thickness of the ion-exchanged glass article; the laser beam operates at a wavelength from 350 nanometers to 619 nanometers and has a pulse duration from about 1 nanosecond to about 50 nanoseconds; the laser beam ablates the second surface of the ion-exchanged glass article to create a plurality of defects in the form of voids or cracks that extend from ablated regions on the second surface of the ion-exchanged glass article; the plurality of defects defines one or more score lines along the ion-exchanged glass article; at least some individual defects of the plurality of defects are non-orthogonal to the first surface of the ion-exchanged glass article and are biased in a direction of translation of the laser beam; at least a portion of the plurality of defects extends a distance greater than the depth of layer of the ion-exchanged glass article; and the plurality of defects creates a crack that propagates within the ion-exchanged glass article such that the ion-exchanged glass article separates along the one or more score lines.",
    "10. The method of claim 9, wherein the crack does not propagate ahead of the laser beam in a direction of translation of the laser beam.",
    "11. The method of claim 9, wherein individual defects of the plurality of defects are discrete with respect to one another prior to separation of the ion-exchanged glass article.",
    "12. The method of claim 1, wherein the plurality of defects extends into the distance of the glass article without changing a vertical position of the beam waist."
  ],
  "description_excerpt": "The present specification generally relates to methods of cutting glass using a laser and, more particularly, methods of cutting glass using a laser to introduce defects that extend from a surface of a glass article.\n\nGlass articles are used in a variety of industries including the electronics industry where glass is used to cover displays. Examples of such applications include Liquid Crystal Displays and Light Emitting Diode displays, for example, computer monitors, televisions, and handheld devices. Conventionally, glass has been produced in large sheets and is scored using a mechanical scoring wheel or a laser. After being scored, an external force is applied to the glass sheet to break the glass along the score line. With the glass portioned into smaller sizes, the glass partitions undergo further processing including, for example, edge polishing and/or a chemical strengthening process.\n\nProcessing glass according to the conventional method has proven burdensome. First, when glass is broken along the score line by an application of force, the application of force tends to damage the glass portions, which may increase the scrap rate. Further, for chemically strengthened glass, introducing the smaller, separated glass articles to a chemical strengthening process after the cutting process decreases throughput, as the smaller glass articles require increased operator intervention as compared to processing a larger mother glass sheet.",
  "cpc": [
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    "B23K 26/53",
    "B23K 26/57",
    "C03B 33/02"
  ],
  "assignees": [
    "Corning Inc"
  ],
  "inventors": [
    "Anatoli Anatolyevich Abramov",
    "Naiyue Zhou"
  ],
  "filing_date": "2013-03-15",
  "publication_date": "2018-04-10",
  "grant_date": "2018-04-10",
  "priority_date": "2012-06-05",
  "application_number": "US-201313836717-A",
  "family_id": "49670594",
  "cited_by_count": 6,
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