LAMINATED GLASS FOR VEHICLE

• US 20070148472A1
• Filed: 12/18/2006
• Published: 06/28/2007
• Est. Priority Date: 12/26/2005
• Status: Active Grant

• Current Assignee: AGC, Inc.
• Original Assignee: Asahi Glass Company, Limited (AGC, Inc.)
• Inventors: Kurihara, Kazuyuki, MASAKI, Yuuji
• Granted Patent: US 8,075,983 B2
• Time in Patent Office: Days
• US Class Current: 428/426
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10568 varying in thickness
• CPC Class Codes: B32B 17/10633 Infrared radiation absorbing or reflecting agents
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 17/10981 Pre-treatment of the layers
• CPC Class Codes: B32B 2250/03 3 layers
• CPC Class Codes: Y10T 428/24802 Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
• CPC Class Codes: Y10T 428/24851 Intermediate layer is discontinuous or differential
• CPC Class Codes: Y10T 428/24926 including ceramic, glass, porcelain or quartz layer
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/31634 Next to cellulosic

Abstract

The present invention provides, in a HUD device employing a high-functional windshield such as a sound-insulation glass having a multi-layer interlayer, a windshield for a vehicle which does not produce double images and has excellent visibility without deteriorating functionality of the windshield. In a laminated glass having a multi-layer interlayer having a wedge-shaped thickness profile sandwiched by glass sheets, the multi-layer interlayer has layers having different hardness, the thickness of first resin layers having high hardness is at least 0.3 mm in a region within 400 mm from a lower side, which prevents the generation of optical distortion of the laminated glass and efficiently prevents double display images.

Claims

1. A laminated glass for a vehicle, comprising two curved glass sheets and an interlayer made of a multi-layer resin and provided between the glass sheets, the glass sheets and the interlayer being laminated together, wherein the interlayer is a multilayer film comprising at least one first resin layer and at least one second resin layer having lower hardness than that of the first resin layer, wherein the interlayer has a wedge-shaped thickness profile in which the upper side of the interlayer, when the laminated glass is in a position attached to a vehicle, is thicker than the lower side of the interlayer, and wherein the thickness of the first resin layer is at least 0.3 mm in an area within 400 mm from the edge of the lower side.

2. The laminated glass for a vehicle according to claim 1, wherein the interlayer comprises three layers which are the second resin layer and the first resin layers sandwiching the second resin layer.

3. The laminated glass for a vehicle according to claim 1 or 2, wherein at least one layer of the first resin layers has a wedge-shaped thickness profile in which the upper side of the layer is thicker than the lower side of the layer.

4. The laminated glass for a vehicle according to claim 1 or 2, wherein at least one layer of the second resin layers has a wedge-shaped thickness profile in which the upper side of the layer is thicker than the lower side of the layer.

5. The laminated glass for a vehicle according to claim 1 or 2, wherein the thickness of the first resin layer in the upper side is at least 0.5 mm.

6. The laminated glass for a vehicle according to claim 3, 4 or 5, which further comprises a shade functional area having a strip shape along the upper side.

7. The laminated glass for a vehicle according to claim 6, wherein the shade functional area is formed in the layer having the wedge-shaped thickness profile.

8. A laminated glass for a vehicle, comprising two curved glass sheets and an interlayer made of a multi-layer organic resin and provided between the glass sheets, the glass sheets and the interlayer being laminated together, wherein the interlayer is a multilayer film comprising at least one first resin layer and at least one second resin layer having lower hardness than that of the first resin layer, wherein the interlayer has a wedge-shaped thickness profile in which the upper side of the interlayer, when the laminated glass is in a position attached to a vehicle, is thicker than the lower side of the interlayer, and wherein the thickness of the first resin layer is at least 0.3 mm in an area within 400 mm from the edge of the lower side, IR cutoff fine particles are dispersed in the first and/or the second resin layer having the wedge-shaped thickness profile.

9. The laminated glass for a vehicle according to claim 8, wherein the interlayer comprises three layers which are the second resin layer and the first resin layers sandwiching the second resin layer.

10. The laminated glass for a vehicle according to claim 9, wherein at least one layer of the first resin layers has a wedge-shaped thickness profile in which the upper side of the layer is thicker than the lower side of the layer.

11. The laminated glass for a vehicle according to claim 9, wherein at least one layer of the second resin layers has a wedge-shaped thickness profile in which the upper side of the layer is thicker than the lower side of the layer.

12. The laminated glass for a vehicle according to claim 9, wherein the thickness of the first resin layer in the upper side is at least 0.5 mm.

13. The laminated glass for a vehicle according to claim 10, 11 or 12, which further comprises a shade functional area having a strip shape along the upper side.

14. The laminated glass for a vehicle according to claim 13, wherein the shade functional area is formed in the layer having the wedge-shaped thickness profile.

15. The laminated glass for a vehicle according to claim 13, wherein the IR cutoff fine particles are dispersed in the layer having the shade functional area.

16. A head-up display device comprising a light source for emitting light beam of display information, a glass sheet disposed so as to be opposed to the light source and a display area formed on the glass sheet and for displaying the display information emitted from the light source, wherein the glass sheet is a laminated glass sheet in which two curved glass sheets and an interlayer made of a multilayer resin provided between the glass sheets, are laminated together, the laminated glass has a wedge-shaped thickness profile in which the upper side of the laminated glass, when the laminated glass is attached to a vehicle, is thicker than the lower side of the laminated glass, the interlayer comprises at least a first resin layer and a second resin layer having a hardness lower than that of the first resin layer, and the thickness of the first resin layer in the display area is at least 0.3 mm.

17. The head-up display device according to claim 16, wherein IR cutoff fine particles are dispersed in the first and/or the second resin layer having the wedge-shaped thickness profile.

18. The head-up display device according to claim 16 or 17, which further comprises a shade functional area having a strip shape along the upper side.

19. The head-up display device according to claim 18, wherein the shade functional area is formed in the layer having the wedge-shaped thickness profile.

20. The head-up display device according to claim 18, wherein the IR cutoff fine particles are dispersed in the layer having the shade functional area.