Screen protector comprising a glass-based substrate and an adhesive

Patent metadata

Field	Value
Publication number	US-11334116-B2
Application number	US-201916538337-A
Country	US
Kind code	B2
Filing date	Aug 12, 2019
Priority date	Aug 14, 2018
Publication date	May 17, 2022
Grant date	May 17, 2022

Abstract

A screen protector comprises a glass-based substrate and an adhesive. The glass-based substrate comprises a first major surface, a second major surface, a thickness, and an edge. The first major surface comprises a first planar portion and a peripheral portion extending outwardly from the first planar portion. The second major surface comprises a second planar portion opposite the first planar portion and is parallel to the first planar portion. The edge comprises an outer peripheral surface that intersects the peripheral portion of the first major surface. The adhesive comprises a first major surface, a second major surface, a thickness, and an edge. The first major surface of the adhesive is adhered to the second major surface of the glass-based substrate.

First claim

What is claimed is:

1. A screen protector comprising:
a glass-based substrate comprising:
a first major surface comprising a first planar portion and a peripheral portion extending outwardly from the first planar portion;
a second major surface comprising a second planar portion opposite the first planar portion, wherein the second planar portion is parallel relative to the first planar portion;
a thickness defined between the first planar portion and the second planar portion along a thickness direction perpendicular to the first planar portion is within a range of from about 100 micrometers to about 1,000 micrometers; and
an edge extending between the first major surface and the second major surface, the edge comprising an outer peripheral surface intersecting the peripheral portion of the first major surface, the edge further comprising an undercut surface intersecting the outer peripheral surface of the edge and the second planar portion of the second major surface; and

an adhesive comprising:
a first major surface adhered to the second planar portion of the second major surface of the glass-based substrate;
a second major surface opposite the first major surface of the adhesive;
a thickness defined between the first major surface of the adhesive and the second major surface of the adhesive; and
an edge extending between the first major surface of the adhesive and the second major surface of the adhesive,

wherein the screen protector comprises a 10% probability of failure for a four-point bend test (B10 edge strength) within a range of from about 300 MegaPascals (MPa) to about 1,000 MPa, the glass-based substrate is mounted to a mounting surface of an electronic device with the adhesive, and the apparatus comprises an average failure for an edge crush test (average crush strength) on the glass-based sheet for a load within a range of from about 50 Newtons (N) to about 500 N, the edge crush test comprises increasing a load applied by a probe in a direction of the probe axis at a location within 3 mm from an outermost peripheral extent of the outer peripheral surface of the screen protector until failure or a predetermined maximum load is reached, the probe comprising a surface area of 1.4 mm 2 with an inclined angle of 30.17° bisected by the probe axis and an end portion extending 0.25 mm in the direction of the probe axis.

2. The screen protector of claim 1 , wherein the peripheral portion of the first major surface of the glass-based substrate extends in a direction toward a plane of the second planar portion.

3. The screen protector of claim 1 , wherein the outer peripheral surface of the edge comprising a height in the thickness direction that is within a range of from about 60% to about 99% of the thickness of the glass-based substrate.

4. The screen protector of claim 1 , wherein the undercut surface comprises a height in the thickness direction that is within a range of from about 100 nanometers to about 50 micrometers.

5. The screen protector of claim 1 , wherein a maximum distance between the outer peripheral surface of the edge of the glass-based substrate and the edge of the adhesive in a direction perpendicular to the thickness direction of the glass-based substrate is within a range of from about 100 nanometers to about 80 micrometers.

6. The screen protector of claim 2 , wherein the undercut surface of the edge of the glass-based substrate comprises a surface roughness (Ra) within a range of from about 1 nanometer to about 50 nanometers.

7. An apparatus comprising:
a glass-based substrate comprising:
a first major surface comprising a first planar portion and a peripheral portion extending outwardly from the first planar portion;
a second major surface comprising a second planar portion opposite the first planar portion, wherein the second planar portion is parallel relative to the first planar portion;
a thickness defined between the first planar portion and the second planar portion along a thickness direction perpendicular to the first planar portion is within a range of from about 100 micrometers to about 1,000 micrometers; and
an edge extending between the first major surface and the second major surface, the edge comprising an outer peripheral surface intersecting the peripheral portion of the first major surface, the edge further comprising an undercut surface intersecting the outer peripheral surface of the edge and the second planar portion of the second major surface, the outer peripheral surface of the edge comprising a height in the thickness direction that is within a range of from about 60% to about 99% of the thickness of the glass-based substrate, the undercut surface comprising a surface roughness (Ra) within a range of from about 1 nanometer to about 50 nanometers;

an adhesive comprising:
a first major surface adhered to the second planar portion of the second major surface of the glass-based substrate;
a second major surface opposite the first major surface of the adhesive;
a thickness defined between the first major surface of the adhesive and the second major surface of the adhesive is within a range of from about 50 micrometers to about 200 micrometers; and
an edge extending between the first major surface of the adhesive and the second major surface of the adhesive, wherein a maximum distance between the outer peripheral surface of the edge of the glass-based substrate and the edge of the adhesive in a direction perpendicular to the thickness direction of the glass-based substrate is within a range of from about 100 nanometers to about 100 micrometers; and

an electronic device comprising a mounting surface,
wherein the glass-based substrate is mounted to the mounting surface of the electronic device with the adhesive, and the apparatus comprises an average failure for an edge crush test (average crush strength) on the glass-based sheet for a load within a range of from about 50 Newtons (N) to about 500 N, the edge crush test comprises increasing a load applied by a probe in a direction of the probe axis at a location within 3 mm from an outermost peripheral extent of the outer peripheral surface of the screen protector until failure or a predetermined maximum load is reached, the probe comprising a surface area of 1.4 mm 2 with an inclined angle of 30.17° bisected by the probe axis and an end portion extending 0.25 mm in the direction of the probe axis.

8. The apparatus of claim 7 , wherein the peripheral portion of the first major surface of the glass-based substrate extends in a direction toward a plane of the second planar portion.

9. The apparatus of claim 7 , wherein the undercut surface comprises a height in the thickness direction that is within a range of from about 100 nanometers to about 50 micrometers.

10. The apparatus of claim 7 , wherein the maximum distance between the outer peripheral surface of the edge of the glass-based substrate and the edge of the adhesive in a direction perpendicular to the thickness direction of the glass-based substrate is within a range of from about 100 nanometers to about 80 micrometers.

11. The apparatus of claim 7 , wherein the maximum distance between the outer peripheral surface of the edge of the glass-based substrate and the edge of the adhesive in a direction perpendicular to the thickness direction of the glass-based substrate is within a range of from about 1 micrometer to about 50 micrometers.

12. A portable electronic device comprising the screen protector of claim 7 comprising:
a display;
screen extending over the display, the screen comprising an outer major surface; and
the second major surface of the adhesive adhered to the outer major surface of the sc

Assignees

• Corning Inc

Inventors

• Buono Sean Michael
• Immerman Jacob
• Lu Chih Yuan
• Morrison Jr James Edward
• Pal Santona
• Subramanian Ananthanarayanan
• Yeh Chu Yu

Classifications

• B32B7/12 Primary

  using interposed adhesives or interposed materials with bonding properties · CPC title

• H04B1/3888

  Arrangements for carrying or protecting transceivers · CPC title

• B32B2571/00

  Protective equipment · CPC title

• H04M1/02

  Constructional features of telephone sets · CPC title

• B32B17/06

  comprising glass as the main or only constituent of a layer, next to another layer of a specific {material} · CPC title