Vehicle windshield

• US 9,481,228 B2
• Filed: 04/09/2015
• Issued: 11/01/2016
• Est. Priority Date: 10/15/2012
• Status: Active Grant

• Current Assignee: AGC, Inc.
• Original Assignee: Asahi Glass Company, Limited (AGC, Inc.)
• Inventors: Ishioka, Hideki
• Primary Examiner(s): LYJAK, LORI LYNN
• Application Number:
  US14/682,524
• Publication Number:
  US 20150210144A1
• Time in Patent Office: 572 Days
• US Class Current: 1/1
• CPC Class Codes: B60J 1/002 with means for clear vision, e.g. anti-frost or defog panes, rain shields window heating in H05B3/84, H05B3/86
• CPC Class Codes: B60J 1/02 arranged at the vehicle front , e.g. structure of the glazing, mounting of the glazing on windscreen mounted antenna wire H01Q1/1271
• CPC Class Codes: C03C 17/25 by deposition from the liquid phase
• CPC Class Codes: C03C 17/32 with synthetic or natural resins C03C17/30 takes precedence
• CPC Class Codes: C03C 17/3405 with at least two coatings of organic materials C03C17/36, C03C17/42 take precedence
• CPC Class Codes: C03C 17/42 at least one coating of an organic material and at least one non-metal coating
• CPC Class Codes: C03C 2217/478 Silica
• CPC Class Codes: C03C 2217/485 Pigments
• CPC Class Codes: C03C 2217/75 Hydrophilic and oleophilic coatings

Abstract

There is provided a vehicle windshield which can decrease chances of a fogging to occur by having an antifogging property, and under a situation that a fogging occurs, it is able to allow a driver to easily and surely recognize an occurrence state of the fogging in its initial state without adversely affecting visibility. The vehicle windshield has a window glass, a strip-shaped black ceramic layer, and a water absorbing antifogging film, wherein the water absorbing antifogging film has a thin-film area located outside a visual field area where a visual field of a driver is ensured in the vehicle windshield and inside an area where the black ceramic layer is formed, the thin-film area having a maximum film thickness in a range of 30% to 70% of a minimum film thickness in the visual field area and having a size recognizable by the driver when a fogging occurs.

Claims

1. A vehicle windshield, comprising:

a window glass;

a strip-shaped black ceramic layer formed in a peripheral portion of the window glass; and

a water absorbing antifogging film provided on a vehicle-interior side surface of the window glass;

wherein the water absorbing antifogging film has a thin-film area located outside a visual field area where a visual field of a driver is ensured in the vehicle windshield and inside an area where the black ceramic layer is formed, the thin-film area having a maximum film thickness in a range of 30% to 70% of a minimum film thickness in the visual field area and having a size recognizable by the driver when a fogging occurs.

2. The vehicle windshield according to claim 1,

wherein the visual field area comprises at least a test area A specified in JIS R3212 (1998).

3. The vehicle windshield according to claim 1,

wherein the thin-film area of the water absorbing antifogging film is a strip-shaped area having a width of 20 mm or more along at least one side of an inner periphery of the formation area of the black ceramic layer.

4. The vehicle windshield according to claim 3,

wherein the water absorbing antifogging film has the thin-film area only on an upper side.

5. The vehicle windshield according to claim 1,

wherein the water absorbing antifogging film has a saturated water absorption amount of 300 to 600 mg/cm³, and a minimum film thickness of 8 μ

m to 17 μ

m in the visual field area.

6. The vehicle windshield according to claim 1,

wherein the water absorbing antifogging film is formed to have a film thickness gradually increasing from the thin-film area toward the visual field area.

7. The vehicle windshield according to claim 1,

wherein the water absorbing antifogging film comprises a water absorbing resin.

8. The vehicle windshield according to claim 1,

wherein the water absorbing antifogging film is constituted of a water absorbing layer provided on a most vehicle-interior side and a base layer having a lower water absorbing property than the water absorbing layer, the base layer being provided between the water absorbing layer and the window glass.

9. The vehicle windshield according to claim 8,

wherein a deviation of film thickness ratio of the water absorbing layer and the base layer represented by [film thickness of water absorbing layer/film thickness of base layer] in an entire area of the water absorbing antifogging film is ±

1.0 or less.

10. The vehicle windshield according to claim 1,

wherein the water absorbing antifogging film of the visual field area has a water absorption amount of 0.40 mg/cm² or more.

11. The vehicle windshield according to claim 10,

wherein the water absorbing antifogging film of the visual field area has the water absorption amount of 0.50 mg/cm² or more.

12. The vehicle windshield according to claim 7,

wherein the water absorbing resin has a glass transition point of 10°

C. to 110°

C.

13. The vehicle windshield according to claim 8,

wherein the base layer has a glass transition point of 30°

C. to 80°

C.