Glass laminate including reflective film

Patent metadata

Field	Value
Publication number	US-12403674-B2
Application number	US-202418746176-A
Country	US
Kind code	B2
Filing date	Jun 18, 2024
Priority date	Sep 24, 2018
Publication date	Sep 2, 2025
Grant date	Sep 2, 2025

Abstract

A glass laminate including first and second glass layers, a reflective film having opposed first and second major surfaces and disposed between the first and second glass layers with the first and second major surfaces facing the respective first and second glass layers, a first adhesive layer disposed between and bonding together the first glass layer and the reflective film, and a second adhesive layer disposed between and bonding together the second glass layer and the reflective film is described. The second adhesive layer is thicker than the first adhesive layer such that the first major surface of the reflective film is separated from an outermost major surface of the first glass layer by a distance d1, the second major surface of the reflective film is separated from an outermost major surface of the second glass layer by a distance d2, and 0.05≤d1/d2≤0.9.

First claim

What is claimed is:

1. A glass laminate comprising:
first and second glass layers having substantially parallel outermost major surfaces; and
a reflective film comprising a plurality of alternating polymeric interference layers and disposed asymmetrically between the outermost major surfaces such that when a light source positioned within 2 m of the glass laminate projects a line onto the outermost major surface of the first glass layer along a first direction making an angle θ in a range of 30 degrees to 85 degrees with respect to a normal to the glass laminate so that the line extends along a second direction orthogonal to a first plane defined by the first direction and the normal and has a projected luminance distribution about a centerline of the projected line having a full width at half maximum of no more than 0.05 degrees, a first portion of the projected line reflects from the reflective film and a second portion of the projected line reflects from the outermost major surface of the first glass layer, a reflected image of the line comprising a primary reflected image portion defined by the reflected first portion and a first ghost portion defined by the reflected second portion, the first ghost portion substantially overlapping with the primary reflected image portion.

2. The glass laminate of claim 1 , wherein a third portion of the projected line reflects from the outermost major surface of the second glass layer, the reflected image of the line further comprising a second ghost portion defined by the reflected third portion, the second ghost portion substantially overlapping with the primary reflected image portion.

3. The glass laminate of claim 1 , wherein the reflected image has a reflected luminance distribution having a maximum at a peak of the reflected luminance distribution and decreasing monotonically in at least one lateral direction away from the peak to an edge of the reflected image.

4. The glass laminate of claim 1 , wherein the full width at half maximum of the projected line is no more than 0.03 degrees, and wherein the reflected image has an angular distribution of luminance having a full width at half maximum of no more than 0.1 degrees.

5. The glass laminate of claim 1 , wherein the second ghost portion has a brightness less than 0.6 times a brightness of first ghost portion.

Assignees

• 3M Innovative Properties Company

Inventors

• Vanderlofske Iii John F
• Franey Eileen M
• Pankratz Stephan J
• Johnson Matthew B
• Wheeler Brianna N
• Haag Adam D
• Gillette Kristy A
• Shaver Jonah

Classifications

• G02B27/0018

  with means for preventing ghost images (anti-reflection coatings G02B1/11) · CPC title

• G02B5/30

  Polarising elements (light-modulating devices with active elements G02F1/00) · CPC title

• B32B2307/42

  Polarizing, birefringent, filtering · CPC title

• B32B2307/416

  Reflective · CPC title

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title