# US 11,078,111 B2 · Automotive interiors and cover glass articles with improved headform impact performance and post-breakage visibility

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- Number: US 11,078,111 B2
- Document ID: US11078111B2
- Status: Granted
- Kind: B2
- Application number: 16/517,105
- Filed: 2019-07-19
- Published: 2020-01-23
- Granted: 2021-08-03
- Earliest claimed: 2018-07-23
- Assignees: Corning Incorporated
- Applicants: Corning Incorporated
- Inventors: Matthew Lee Black; Khaled Layouni; Yawei Sun; Chunhe Zhang
- Web page: https://patentgrep.com/patent/US11078111B2

## CPC

- C03C 21/002: {to perform ion-exchange between alkali ions (C03C21/005 takes precedence)}
- B60K 35/10: Input arrangements, i.e. from user to vehicle, associated with vehicle functions or specially adapted therefor
- B60K 35/22: Display screens
- B60K 35/415: {Glare prevention}
- B60K 35/425: {Anti-reflection arrangements}
- G02B 1/115: Multilayers
- H05K 5/0243: {for decorative purposes}
- H05K 5/03: Covers
- B60K 2360/1434: Touch panels
- Y10T 428/315: Surface modified glass [e.g., tempered, strengthened, etc.]
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Embodiments of glass articles including a compressive stress (CS) region and a central tension (CT) region, wherein a portion of the CS region extends from the first major surface to a depth of compression (DOC), wherein, when the glass article is in a substantially flat configuration, the CT region has a maximum value (CTflat) that is about 60 MPa or less, and wherein, when the glass article is in a cold bent configuration, CT region comprises a maximum value (CTbent), wherein CTbent/CTflat<1.4. Embodiments of automotive interior systems including such glass articles are provided, along with methods for forming a glass article and for forming an automotive interior system are also disclosed.

## Claims

### Claim 1

A glass article configured to be placed over a display of an automotive interior system, the glass article comprising:
a first major surface, a second major surface, a minor surface connecting the first major surface and the second major surface, and a thickness (t) (millimeters) in a range from about 0.1 mm to 0.8 mm;
a compressive stress (CS) region; and
a central tension (CT) region,
wherein the CS region and the CT region define a stress profile along the thickness,
wherein all points of the stress profile along at least a portion of the CT region form a power-law profile having a power exponent, wherein the power exponent is in a range from about 1.2 to 3.4;
wherein a portion of the CS region extends from the first major surface to a depth of compression (DOC),
wherein the glass article is configured to convert from a flat configuration in which the CT region has a maximum value (CTflat) that is about 60 MPa or less to a cold bent configuration, wherein the glass article in the cold bent configuration comprises a maximum tensile value (CTbent), wherein CTbent/CTflat<1.4; and
wherein, after an impactor having a mass of 6.8 kg impacts the first major surface at an impact velocity of 5.35 m/s to 6.69 m/s, the glass article breaks into fragments having a minimum dimension that is greater than 5% of a surface area of the display over which the glass article is configured to be placed.

### Claim 2 (depends on 1)

The glass article of claim 1, wherein the CTflat is about 40 MPa or less.

### Claim 3 (depends on 1)

The glass article of claim 1, wherein the CTflat is about 20 MPa or less.

### Claim 4 (depends on 1)

The glass article of claim 1, wherein the portion of the CS region comprises a spike region, a tail region and a knee region between the spike region and the tail region, wherein all points of the stress profile in the spike region comprise a tangent having a slope that is in a range from −200 MPa/micrometer to −15 MPa/micrometer and all points in the tail region comprise a tangent having a slope that is in a range from −3 MPa/micrometer to −0.01 MPa/micrometer.

### Claim 5 (depends on 4)

The glass article of claim 4, wherein the spike region comprises a CS value in a range from greater than 200 MPa to about 1500 MPa.

### Claim 6 (depends on 4)

The glass article of claim 4, wherein the knee region comprises a C S value in a range from about 50 MPa to about 200 MPa.

### Claim 7 (depends on 6)

The glass article of claim 6, wherein the knee region extends from about 10 micrometers to about 50 micrometers from the first major surface.

### Claim 8 (depends on 4)

The glass article of claim 4, wherein the tail region extends from about the knee region to the DOC, wherein the DOC is up to about 0.25t.

### Claim 9 (depends on 1)

The glass article of claim 1, wherein at least one of CTbend, CTflat and the combined CTbend and CTflat is less than the result of the equation, 52.029−42.032*ln(t).

### Claim 10 (depends on 1)

The glass article of claim 1, wherein all points of the stress profile along at least a portion of the CT region comprises comprise a tangent having a slope that is in a range from 1 MPa/micrometer to −1 MPa/micrometer.

### Claim 11 (depends on 10)

The glass article of claim 10, wherein the at least 50% of the CT region comprises the tangent having a slope that is in a range from 1 MPa/micrometer to −1 MPa/micrometer.

### Claim 12 (depends on 4)

The glass article of claim 4, wherein all points of the stress profile in the tail region form a power-law profile having a power exponent, wherein the power exponent is in a range from about 1.2 to 3.4.

### Claim 13 (depends on 1)

The glass article of claim 1, wherein all points of the stress profile along the CT region form a power-law profile having a power exponent, wherein the power exponent is in a range from about 1.2 to 3.4.

### Claim 14 (depends on 1)

The glass article of claim 1, wherein the glass article is in a flat configuration.

### Claim 15 (depends on 1)

The glass article of claim 1, wherein the glass article is in the cold bent configuration and comprises a conical surface, a cylindrical surface or a developable surface.

### Claim 16 (depends on 15)

The glass article of claim 15, wherein the first major surface comprises a first major surface CS value that is in a range from about 900 MPa to about 1500 MPa, and the second major surface comprises a second major surface CS value that differs from the first major surface CS value.

### Claim 17 (depends on 14)

The glass article of claim 14, further comprising a display or touch panel disposed on the first or second major surface.

### Claim 18 (depends on 17)

The glass article of claim 17, further comprising an adhesive disposed between the first or second major surface and the display or touch panel.

### Claim 19 (depends on 15)

The glass article of claim 15, at least a portion of the first or second major surface comprise a radius of curvature in a range from about 20 mm to about 10,000 mm.

### Claim 20 (depends on 1)

The glass article of claim 1, wherein t is in a range from about 0.1 mm to about 2 mm.

### Claim 21 (depends on 1)

The glass article of claim 1, wherein either one of or both the first major surface and the second major surface comprises a surface treatment.

### Claim 22 (depends on 21)

The glass article of claim 21, wherein the surface treatment covers at least a portion of the first major surface and the second major surface.

### Claim 23 (depends on 21)

The glass article of claim 21, wherein the surface treatment comprises any one of an easy-to-clean surface, an anti-glare surface, an anti-reflective surface, a haptic surface, and a decorative surface.

### Claim 24

The glass article of 23, wherein the surface treatment comprises at least two of any one of an easy-to-clean surface, an anti-glare surface, an anti-reflective surface, a haptic surface, and a decorative surface.

### Claim 25 (depends on 24)

The glass article of claim 24, wherein the first major surface comprises the antiglare surface and the second major surface comprises the anti-reflective surface.

### Claim 26 (depends on 24)

The glass article of claim 24, wherein the first major surface comprises the antireflective surface and the second major surface comprises the anti-glare surface.

### Claim 27 (depends on 24)

The glass article of claim 24, wherein the first major surface comprises either one of or both the anti-glare surface and the anti-reflective surface, and the second major surface comprises the decorative surface.

### Claim 28 (depends on 24)

The glass article of claim 24, wherein the decorative surface is disposed on at least a portion of the periphery and the interior portion is substantially free of the decorative surface.

### Claim 29 (depends on 24)

The glass article of claim 24, wherein the anti-glare surface comprises an etched surface, and wherein the anti-reflective surface comprises a multi-layer coating.

### Claim 30 (depends on 1)

The glass article of claim 1, wherein, after the impactor impacts the first major surface, a deceleration of the impactor is not greater than 80 g for any 3 ms interval over a time of impact.