# US 2019/0169068 A1 · Windshield and windshield manufacturing method

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- Number: US 2019/0169068 A1
- Document ID: US20190169068A1
- Status: Published application
- Kind: A1
- Application number: 16/321,387
- Filed: 2017-07-27
- Published: 2019-06-06
- Earliest claimed: 2016-07-29
- Assignees: Nippon Sheet Glass Co., Ltd.
- Applicants: Nippon Sheet Glass Company, Limited
- Inventors: Kazuaki OYA; Fumiyoshi KONDO; Shinya OKAMOTO
- Web page: https://patentgrep.com/patent/US20190169068A1

## CPC

- C03C 17/3417: {all coatings being oxide coatings}
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 17/10: of synthetic resin
- B32B 17/10128: {Treatment of at least one glass sheet}
- B32B 17/10165: {Functional features of the laminated safety glass or glazing}
- B32B 17/10238: {in the form of particles}
- B32B 17/10348: {comprising an obscuration band}
- B32B 27/20: using fillers, pigments, thixotroping agents
- B60J 1/00: Windows; Windscreens; Accessories therefor (B60J10/00 takes precedence; air curtains instead of windows B60J9/04 {; sealing strips for windshields B60J10/70; sealing sash guides for sliding window panes B60J10/74; glass partitions inside vehicles to protect occupants against personal attack B60R21/12})
- B60J 1/008: {of special shape, e.g. beveled edges, holes for attachment, bent windows, peculiar curvatures such as when being integrally formed with roof, door, etc.}
- B60R 11/04: Mounting of cameras operative during drive; Arrangement of controls thereof relative to the vehicle
- C03C 17/34: with at least two coatings having different compositions (C03C17/44 takes precedence)
- B32B 17/10036: {comprising two outer glass sheets}
- B32B 17/10293: {Edge features, e.g. inserts or holes}
- B32B 2605/08: Cars
- B60R 2011/0075: {using a containment or docking space}
- C03C 2217/476: Tin oxide or doped tin oxide
- C03C 2218/365: Coating different sides of a glass substrate
- 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
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B60J: WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES (fastening, suspending, closing, or opening of such devices E05)
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR

## Abstract

The present invention is a windshield for an automobile on which an information acquisition device configured to acquire information from the outside of a vehicle by emitting and/or receiving light can be arranged. The windshield includes: a laminated glass including an information acquisition region that is opposite to the information acquisition device and through which the light passes; and an antifog sheet in which at least a sticky layer, a substrate film, and an antifog layer are layered in this order, the sticky layer being attached to at least a surface on a vehicle interior side of the information acquisition region. The laminated glass includes at least one glass plate in which surface concentrations of tin oxide in two principal surfaces are different, and a surface of the glass plate in which the concentration of tin oxide is higher faces the vehicle interior side.

## Claims

### Claim 1

A windshield for an automobile on which an information acquisition device configured to acquire information from an outside of a vehicle by emitting and/or receiving light can be arranged, the windshield comprising:
a laminated glass including an information acquisition region that is opposite to the information acquisition device and through which the light passes; and
an antifog sheet in which at least a sticky layer, a substrate film, and an antifog layer are layered in this order, the sticky layer being attached to at least a surface on a vehicle interior side of the information acquisition region,
wherein the laminated glass includes at least one glass plate in which surface concentrations of tin oxide in two principal surfaces are different, and a surface of the glass plate in which the concentration of tin oxide is higher faces the vehicle interior side.

### Claim 2 (depends on 1)

The windshield according to claim 1, further comprising:
a blocking layer that is provided on the laminated glass, blocks a field of vision from the outside of the vehicle, and is provided with an opening arranged to correspond to the information acquisition region; and
a bracket for attaching the information acquisition device at a position that is opposite to the opening,
wherein the bracket is arranged around the opening and fixed such that at least a portion of the bracket is blocked by the blocking layer.

### Claim 3 (depends on 1)

The windshield according to claim 1,
wherein the glass plate in which the surface concentrations of tin oxide in the two principal surfaces are different is made of float glass, and
a surface of the two principal surfaces of the float glass in which the concentration of tin oxide is higher is taken as a bottom surface, and a surface in which the concentration of tin oxide is lower is taken as a top surface.

### Claim 4 (depends on 3)

The windshield according to claim 3,
wherein the laminated glass includes an inner glass plate arranged on a vehicle interior side, an outer glass plate arranged on a vehicle exterior side, and an interlayer arranged between the inner glass plate and the outer glass plate,
the inner glass plate and the outer glass plate are made of the float glass, and
the top surface of the inner glass plate and the top surface of the outer glass plate are in contact with the interlayer.

### Claim 5 (depends on 3)

The windshield according to claim 3,
wherein the laminated glass includes an inner glass plate arranged on a vehicle interior side, an outer glass plate arranged on a vehicle exterior side, and an interlayer arranged between the inner glass plate and the outer glass plate,
the inner glass plate and the outer glass plate are made of the float glass, and
the top surface of the inner glass plate and the bottom surface of the outer glass plate are in contact with the interlayer.

### Claim 6 (depends on 2)

The windshield according to claim 2,
wherein a planar size of the antifog sheet is larger than a planar size of the opening of the blocking layer.

### Claim 7 (depends on 6)

The windshield according to claim 6,
wherein the bracket is formed in a frame shape, and
the planar size of the antifog sheet is smaller than an internal size of the bracket.

### Claim 8 (depends on 2)

The windshield according to claim 2,
wherein a planar size of the antifog sheet is smaller than a planar size of the opening of the blocking layer.

### Claim 9 (depends on 2)

The windshield according to claim 2,
wherein a planar size of the opening of the blocking layer is larger than a planar size of the information acquisition region, and
a planar size of the antifog sheet is larger than the planar size of the information acquisition region and smaller than the planar size of the opening of the blocking layer.

### Claim 10 (depends on 2)

The windshield according to claim 2,
wherein at least a portion of an edge of the antifog sheet is in contact with an edge of the opening of the blocking layer.

### Claim 11 (depends on 2)

The windshield according to claim 2,
wherein an imaging device for taking images of the outside of the vehicle through the information acquisition region and a laser device for emitting and/or receiving a ray of light that serve as the information acquisition devices are lined up in a horizontal direction, and
a portion where the edge of the opening of the blocking layer and the edge of the antifog sheet are in contact with each other is arranged on the imaging device side.

### Claim 12 (depends on 1)

The windshield according to claim 1,
wherein a total thickness of the substrate film and the antifog layer of the antifog sheet is larger than a thickness of the blocking layer.

### Claim 13

(canceled)

### Claim 14 (depends on 1)

The windshield according to claim 1,
wherein the interlayer contains heat-ray absorbing particles, and
the particles are not arranged in a region of the interlayer that overlaps the blocking layer and the opening in a plan view, and are arranged in the other region.

### Claim 15 (depends on 1)

The windshield according to claim 1,
wherein the antifog layer contains at least one type of polymer selected from the group consisting of urethane resin, epoxy resin, acrylic resin, polyvinyl acetal resin, and polyvinylalcohol resin, and
the polymer is contained in an amount of 50 mass % or more and 99 mass % or less.

### Claim 16 (depends on 1)

The windshield according to claim 1,
wherein the antifog sheet is formed in a rectangular shape in a plan view, and
corner portions of the antifog sheet are rounded.

### Claim 17 (depends on 16)

The windshield according to claim 16,
wherein at least one corner portion of the corner portions of the antifog sheet has a smaller radius of curvature of roundness than those of the other corner portions.

### Claim 18 (depends on 1)

The windshield according to claim 1,
wherein the substrate sheet is made of a material having a thermal conductivity of 5×10−4 cal/cm·sec·° C. or less.

### Claim 19

(canceled)

### Claim 20 (depends on 1)

The windshield according to claim 1,
wherein the antifog sheet is formed to have a trapezoidal cross section in which a side located on the antifog layer side is shorter than a side located on the substrate film side.

### Claim 21 (depends on 20)

The windshield according to claim 20,
wherein an imaging device for taking images of an outside of a vehicle through the information acquisition region and a laser device for emitting and/or receiving a ray of light that serve as the information acquisition devices are lined up in a horizontal direction, and
in the trapezoidal shape seen in the antifog sheet, a leg located on a side on which the laser device is arranged is inclined at a larger angle than an angle at a leg located on a side on which the imaging device is arranged is inclined.

### Claim 22 (depends on 1)

The windshield according to claim 1,
wherein the substrate film includes a plurality of layers.

### Claim at position 23

23-40. (canceled)