Machining of fusion-drawn glass laminate structures containing a photomachinable layer

• US 10,227,256 B2
• Filed: 04/08/2016
• Issued: 03/12/2019
• Est. Priority Date: 02/28/2013
• Status: Active Grant

• Current Assignee: Corning Incorporated
• Original Assignee: Corning Incorporated
• Inventors: Boek, Heather Debra, Cook, Glen Bennett, Edwards, Victoria Ann, Weller, Mark Owen
• Primary Examiner(s): Dehghan, Queenie S
• Application Number:
  US15/094,353
• Publication Number:
  US 20160221865A1
• Time in Patent Office: 1,068 Days
• CPC Class Codes: B32B 17/06 comprising glass as the main or only constituent of a layer, next to another layer of a specific material
• CPC Class Codes: B32B 2307/704 Crystalline
• CPC Class Codes: B32B 2457/00 Electrical equipment
• CPC Class Codes: B32B 3/266 characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
• CPC Class Codes: C03B 17/02 Forming molten glass coated with coloured layers; Forming molten glass of different compositions or layers; Forming molten glass comprising reinforcements or inserts
• CPC Class Codes: C03B 17/064 by the overflow downdraw fusion process; Isopipes therefor
• CPC Class Codes: C03C 15/00 Surface treatment of glass, not in the form of fibres or filaments, by etching etching or surface-brightening compositions, in general C09K13/00
• CPC Class Codes: C03C 21/002 to perform ion-exchange between alkali ions C03C21/005 takes precedence
• CPC Class Codes: C03C 23/002 by ultraviolet light
• CPC Class Codes: C03C 23/007 by thermal treatment
• CPC Class Codes: C03C 3/091 containing aluminium
• CPC Class Codes: C03C 3/093 containing zinc or zirconium
• CPC Class Codes: C03C 3/095 containing rare earths
• CPC Class Codes: G03F 7/0043 Chalcogenides; Silicon, germanium, arsenic or derivatives thereof; Metals, oxides or alloys thereof G03F7/0044 takes precedence
• CPC Class Codes: G03F 7/0757 Macromolecular compounds containing Si-O, Si-C or Si-N bonds G03F7/0752 takes precedence
• CPC Class Codes: G03F 7/38 Treatment before imagewise removal, e.g. prebaking G03F7/265 takes precedence

Abstract

Methods for machining glass structures may be performed on fusion-drawn glass laminates having a core layer interposed between a first cladding layer and a second cladding layer. The core layer may be formed from a core glass composition having a core photosensitivity, the first cladding layer may be formed from a glass composition having a photosensitivity different from the core photosensitivity, and the second cladding layer may be formed from a glass composition having a photosensitivity different from the core photosensitivity. At least one of the core layer, the first cladding layer, and the second cladding layer is a photomachinable layer. The methods may include exposing a selected region of a photomachinable layer in the fusion-drawn laminate to ultraviolet radiation; heating the glass structure until the selected region crystallizes; and removing the crystallized material selectively from the photomachinable layer.

Claims

1. A glass structure comprising:

a first cladding layer formed from a first-clad glass composition having a first-clad photosensitivity;

a second cladding layer formed from a second-clad glass composition having a second-clad photosensitivity; and

a core layer interposed between the first cladding layer and the second cladding layer and formed from a core glass composition having a nonzero core photosensitivity different from the first-clad photosensitivity and the second-clad photosensitivity, wherein;

the first cladding layer is fused to a first surface of the core layer and the second cladding layer is fused to a second surface of the core layer;

the first cladding layer and the second cladding layer each comprises a hole structure that is substantially circular in shape; and

the core layer comprises a via connecting the hole structure of the first cladding layer and the hole structure of the second cladding layer.

2. The glass structure of claim 1, wherein each of the first cladding layer and the second cladding layer is thinner than the core layer.

3. The glass structure of claim 1, wherein the core layer is at least partially transparent to ultraviolet (UV) radiation such that, upon exposure of the core layer to the UV radiation, the UV radiation penetrates into or through the core layer.

4. The glass structure of claim 1, wherein:

the core photosensitivity is less than at least one of the first-clad photosensitivity or the second-clad photosensitivity; and

the via of the core layer is narrower than the hole structure of the first cladding layer and the hole structure of the second cladding layer.

5. A glass structure comprising:

a core layer formed from a core glass composition having a core photosensitivity;

a first cladding layer fused to a first surface of the core layer and formed from a first-clad glass composition having a first-clad photosensitivity different from the core photosensitivity, the first cladding layer comprising a hole structure that is substantially circular in shape; and

a second cladding layer fused to a second surface of the core layer and formed from a second-clad glass composition having a second-clad photosensitivity different from the core photosensitivity, the second cladding layer comprising a hole structure that is substantially circular in shape;

wherein the core layer comprises a via connecting the hole structure of the first cladding layer and the hole structure of the second cladding layer;

wherein each of the first cladding layer and the second cladding layer is thinner than the core layer; and

wherein the core layer is at least partially transparent to ultraviolet radiation.