Vehicle Window Pane and Manufacturing Method Therefor

• US 20090007490A1
• Filed: 12/21/2006
• Published: 01/08/2009
• Est. Priority Date: 12/28/2005
• Status: Active Grant

• Current Assignee: Nippon Sheet Glass Company Limited (Nippon Telegraph and Telephone Corporation)
• Original Assignee: Nippon Sheet Glass Company Limited (Nippon Telegraph and Telephone Corporation)
• Inventors: Yoshida, Mamoru, Ogawa, Hisashi, Iwai, Nobuki, Muromachi, Takashi
• Granted Patent: US 8,367,187 B2
• Time in Patent Office: Days
• US Class Current: 49/70
• CPC Class Codes: B60J 3/007 Sunglare reduction by coatings, interposed foils in laminar windows, or permanent screens layered glass products B32B17/00; process of coating windows C03C17/00
• CPC Class Codes: C03C 17/002 for flat glass, e.g. float glass
• CPC Class Codes: C03C 17/007 containing a dispersed phase, e.g. particles, fibres or flakes, in a continuous phase
• CPC Class Codes: C03C 17/009 Mixtures of organic and inorganic materials, e.g. ormosils and ormocers
• CPC Class Codes: C03C 17/366 Low-emissivity or solar control coatings
• CPC Class Codes: C03C 2217/213 SiO2
• CPC Class Codes: C03C 2217/231 In2O3/SnO2
• CPC Class Codes: C03C 2217/29 Mixtures
• CPC Class Codes: C03C 2217/475 Inorganic materials
• CPC Class Codes: C03C 2217/476 Tin oxide or doped tin oxide
• CPC Class Codes: C03C 2217/948 Layers comprising indium tin oxide [ITO]
• CPC Class Codes: C03C 2218/114 by brushing, pouring or doctorblading
• CPC Class Codes: Y10T 428/24479 including variation in thickness
• CPC Class Codes: Y10T 428/24612 Composite web or sheet
• CPC Class Codes: Y10T 428/24777 Edge feature

Abstract

There is provided a vehicle window pane that can be manufactured at low cost and can reduce burning sensation of the skin of a passenger in the vehicle, and a manufacturing method therefor. With a glass plate 1 held by a glass plate holding member 4 in the vertical direction, a nozzle 2 is used to eject infrared cutoff liquid 3 onto the upper portion 1b of the glass plate 1. The infrared cutoff liquid 3 ejected onto the upper portion 1b of the glass plate 1 flows vertically downward, and is applied onto the glass plate 1. The glass plate 1 to which the infrared cutoff liquid 2 has been applied is dried for approximately five minutes at room temperature. Then, the glass plate 1 to which the infrared cutoff liquid 3 has been applied is placed in an oven preheated to 200° C., heated for ten minutes, and then cooled. The glass plate 1 having the infrared cutoff film thereon is thus formed. The resultant glass plate 1 having the infrared cutoff film thereon is installed in a vehicle 5 in such a way that the lower portion 1c of the glass plate 1 is located on the upper side of the vehicle 5 and the upper portion 1b of the glass plate 1 is located on the lower side of the vehicle 5.

Claims

1. A vehicle window pane having an infrared cutoff film formed thereon and installed in the vehicle, characterized in that:

the film thickness of the infrared cutoff film on the upper side of the vehicle is greater than the film thickness of the infrared cutoff film on the lower side of the vehicle.

2. The vehicle window pane according to claim 1, characterized in that the infrared cutoff film contains a silica component and an infrared cutoff component.

3. The vehicle window pane according to claim 1, characterized in that the infrared cutoff component is at least one of fine particles selected from the group consisting of tin-doped indium oxide (ITO) fine particles, antimony-doped tin oxide (ATO) fine particles, aluminum-doped zinc oxide (AZO) fine particles, indium-doped zinc oxide (IZO) fine particles, tin-doped zinc oxide fine particles, silicon-doped zinc oxide fine particles, lanthanum hexaboride fine particles, and cerium hexaboride fine particles.

4. The vehicle window pane according to claim 1, characterized in that the content of the infrared cutoff component is 20 to 45 mass % of the total mass of the infrared cutoff film.

5. The vehicle window pane according to claim 1, characterized in that the film thickness continuously varies from the upper side of the vehicle to the lower side of the vehicle.

6. The vehicle window pane according to claim 1, characterized in that the difference between the greatest film thickness of the infrared cutoff film on the upper side of the vehicle and the smallest film thickness of the infrared cutoff film on the lower side of the vehicle is 1000 nm or greater.

7. The vehicle window pane according to claim 1, characterized in that the greatest film thickness of the infrared cutoff film on the upper side of the vehicle is equal to or greater than twice the smallest film thickness of the infrared cutoff film on the lower side of the vehicle.

8. The vehicle window pane according to claim 1, characterized in that the infrared cutoff glass on the lower side of the vehicle where the film thickness is the smallest has an optical transmittance of 30% or lower for light with wavelengths of 1000 to 1600 nm and an optical transmittance of 20% or lower for light with wavelengths of 1600 to 2500 nm, and the infrared cutoff glass on the upper side of the vehicle where the film thickness is the greatest has an optical transmittance of 20% or lower for light with wavelengths of 1000 to 1600 nm and an optical transmittance of 10% or lower for light with wavelengths of 1600 to 2500 nm.

9. The vehicle window pane according to claim 1, characterized in that the 1550-nm wavelength light transmittance of the infrared cutoff glass on the upper side of the vehicle where the film thickness is the greatest is equal to or smaller than 50% of the 1550-nm wavelength light transmittance of the infrared cutoff glass on the lower side of the vehicle where the film thickness is the smallest.

10. A manufacturing method for a vehicle window pane having an infrared cutoff film formed thereon and installed in the vehicle, characterized by comprising the steps of:

forming the infrared cutoff film on the surface of a glass plate by using flow coating method; and

installing the glass plate, on which the infrared cutoff film has been formed, in the vehicle in such a way that the film thickness of the infrared cutoff film on the upper side of the vehicle is greater than the film thickness of the infrared cutoff film on the lower side of the vehicle.