Windshield for head-up display system

• US 6,881,472 B2
• Filed: 10/20/2003
• Issued: 04/19/2005
• Est. Priority Date: 09/28/1989
• Status: Expired due to Fees

• Current Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Inventors: Freeman, Glenn E.
• Primary Examiner(s): Loney, Donald J.
• Application Number:
  US10/689,138
• Publication Number:
  US 20040109251A1
• Time in Patent Office: 547 Days
• Field of Search: 428/156, 428/172, 428/192, 428/215, 359/630, 359/894
• US Class Current: 428/172
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10165 Functional features of the laminated safety glass or glazing
• CPC Class Codes: B32B 17/10568 varying in thickness
• CPC Class Codes: B32B 17/1066 imparting a tint in certain regions only, i.e. shade band
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 17/10981 Pre-treatment of the layers
• CPC Class Codes: B32B 2457/20 Displays, e.g. liquid crystal displays, plasma displays
• CPC Class Codes: B32B 3/02 characterised by features of form at particular places, e.g. in edge regions non-uniform thickness B32B3/263
• CPC Class Codes: G02B 2027/012 comprising devices for attenuating parasitic image effects
• CPC Class Codes: G02B 2027/0121 Parasitic image effect attenuation by suitable positioning of the parasitic images
• CPC Class Codes: G02B 27/0018 with means for preventing ghost images anti-reflection coatings G02B1/11
• CPC Class Codes: G02B 27/01 Head-up displays
• CPC Class Codes: G02B 27/0101 characterised by optical features G02B27/0172 takes precedence
• CPC Class Codes: Y10T 428/187 Continuous sectional layer
• CPC Class Codes: Y10T 428/24355 Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
• CPC Class Codes: Y10T 428/24479 including variation in thickness
• CPC Class Codes: Y10T 428/24504 Component comprises a polymer [e.g., rubber, etc.]
• CPC Class Codes: Y10T 428/24612 Composite web or sheet
• CPC Class Codes: Y10T 428/24777 Edge feature
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/24967 : Absolute thicknesses specified
• CPC Class Codes: Y10T 428/26 : Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
• CPC Class Codes: Y10T 428/3163 : Next to acetal of polymerized unsaturated alcohol [e.g., formal butyral, etc.]

Abstract

An automotive transparency includes a first glass ply having a constant thickness, a second glass ply having a constant thickness, and an interlayer having a constant thickness in a first predetermined area and a decreasing thickness in a second predetermined area. The first and second plies are secured together by the interlayer to form a laminate having a first outer major surface, an opposing second outer major surface, a first predetermined area defined by the first predetermined area of the interlayer over which the outer major surfaces are substantially parallel to one another, and a second predetermined area defined by the second predetermined area of the interlayer over which the outer major surfaces are nonparallel to each other such that images reflected off the nonparallel surfaces of the laminate are substantially superimposed over each other to at least reduce double imaging of the reflected image.

Claims

1. An automotive transparency comprising:

a first glass ply having a constant thickness;

a second glass ply having a constant thickness;

an interlayer having a constant thickness in a first predetermined area and a decreasing thickness in a second predetermined area;

the first and second plies secured together by the interlayer to form a laminate having a first outer major surface, an opposing second outer major surface, a first predetermined area defined by the first predetermined area of the interlayer over which the outer major surfaces are substantially parallel to one another, and a second predetermined area defined by the second predetermined area of the interlayer over which the outer major surfaces are nonparallel to each other such that images reflected off the nonparallel surfaces of the laminate are substantially superimposed over each other to at least reduce double imaging of the reflected image.

2. The transparency as in claim 1 wherein the outer major surfaces of the laminate within the second predetermined area form a wedge angle of at least about 0.0115°

.

3. The transparency as in claim 1, wherein the transparency is an automotive windshield.