Reflective, colored, or color-shifting scratch resistant coatings and articles

Patent metadata

Field	Value
Publication number	US-10162084-B2
Application number	US-201815973790-A
Country	US
Kind code	B2
Filing date	May 8, 2018
Priority date	May 8, 2017
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

Embodiments of durable, scratch resistant articles are described. The articles have coatings that provide specific reflectance, transmission, and/or color properties, as well as high hardness. Some embodiments have low reflectance, and high color. Some embodiments have high reflectance and neutral color. Some embodiments have high reflectance and high color. In some embodiments, the articles may be sunglasses with an optical coating, a scratch resistant mirror with an optical coating, or a consumer electronic product with an optical coating.

First claim

The invention claimed is:

1. An article comprising:
a substrate having a major surface; and
an optical coating disposed on the major surface, the optical coating comprising a multilayer interference stack, the multilayer interference stack having an outer surface opposite the major surface;
the article exhibiting a maximum hardness of about 12 GPa or greater as measured on the outer surface by a Berkovich Indenter Hardness Test along an indentation depth of about 100 nm to about 500 nm;
wherein the article exhibits:
a single side average photopic light reflectance measured at the outer surface as measured at near normal incidence of about 10% or less over an optical wavelength regime in the range from about 400 nm to about 700 nm, and
article reflectance color coordinates in the (L*, a*, b*) colorimetry system for at least one incidence angle from 0 degrees to 90 degrees under an International Commission on Illumination illuminant exhibiting a reference point color shift of more than about 12 from a reference point as measured at the outer surface, the reference point comprising at least one of the color coordinates (a*=0, b*=0), and the reflectance color coordinates of the substrate,
wherein, when the reference point is the color coordinates (a*=0, b*=0), the color shift is defined by √((a* article ) 2 +(b* article ) 2 ), and
wherein, when the reference point is the color coordinates of the substrate, the color shift is defined by √((a* article −a* substrate ) 2 +(b* article −b* substrate ) 2 ).

2. An article comprising:
a substrate having a major surface; and
an optical coating disposed on the major surface, the optical coating comprising a multilayer interference stack, the multilayer interference stack having an outer surface opposite the major surface;
the article exhibiting a maximum hardness of about 12 GPa or greater as measured on the outer surface by a Berkovich Indenter Hardness Test along an indentation depth of about 100 nm to about 500 nm;
wherein the article exhibits at least one of:
(1) a single side photopic average light reflectance of about 12% or more and
(2) a single side maximum reflectance of about 12% or more,
measured at the outer surface for at least one near normal incident angle over an optical wavelength regime in the range from about 400 nm to about 700 nm.

3. The article of claim 2 , wherein the article exhibits article reflectance color coordinates in the (L*, a*, b*) colorimetry system for at least one incidence angle from 0 degrees to 90 degrees under an International Commission on Illumination illuminant exhibiting a reference point color shift of more than about 12 from a reference point as measured at the outer surface, the reference point comprising at least one of the color coordinates (a*=0, b*=0), and the reflectance color coordinates of the substrate,
wherein, when the reference point is the color coordinates (a*=0, b*=0), the color shift is defined by √(a* article ) 2 +(b* article ) 2 ),
wherein, when the reference point is the color coordinates of the substrate, the color shift is defined by √(a* article −a* substrate ) 2 +(b* article −b* substrate ) 2 ).

4. The article of claim 2 , wherein the article exhibits article reflectance color coordinates in the (L*, a*, b*) colorimetry system for all incidence angles from 0 degrees to 90 degrees under an International Commission on Illumination illuminant exhibiting a reference point color shift of less than about 12 from a reference point as measured at the outer surface, the reference point comprising at least one of the color coordinates (a*=0, b*=0), and the reflectance color coordinates of the substrate,
wherein, when the reference point is the color coordinates (a*=0, b*=0), the color shift is defined by √(a* article ) 2 +(b* article ) 2 ),
wherein, when the reference point is the color coordinates of the substrate, the color shift is defined by √(a* article −a* substrate ) 2 +(b* article −b* substrate ) 2 ).

5. The article of claim 1 , wherein the article exhibits:
a photopic average light transmission of about 5% to about 50% over an optical wavelength regime from about 400 nm to about 800 nm;
article transmittance color coordinates in the (L*, a*, b*) colorimetry system at normal incidence under an International Commission on Illumination illuminant exhibiting a reference point color shift of less than about 12 from a reference point as measured at the outer surface, the reference point comprising at least one of the color coordinates (a*=0, b*=0) and the transmittance color coordinates of the substrate,
wherein, when the reference point is the color coordinates (a*=0, b*=0), the color shift is defined by √((a* article ) 2 +(b* article ) 2 ),
wherein, when the reference point is the color coordinates of the substrate, the color shift is defined by √((a* article −a* substrate ) 2 +(b* article −b* substrate ) 2 ).

6. The article of claim 5 , wherein the article exhibits:
article transmittance color coordinates in the (L*, a*, b*) colorimetry system at all incidence angles from 0 degrees to 90 degrees under an International Commission on Illumination illuminant exhibiting a reference point color shift of less than about 12 from a reference point as measured at the outer surface, the reference point comprising at least one of the color coordinates (a*=0, b*=0) and the transmittance color coordinates of the substrate.

7. The article of claim 1 , wherein the article exhibits:
a reflected angular color shift of about 12 or more for at least one incident illumination angle from 20 degrees to 80 degrees, referenced to normal incidence, under an International Commission on Illumination illuminant selected from the group consisting of A series illuminants, B series illuminants, C series illuminants, D series illuminants, and F series illuminants, wherein angular color shift is calculated using the equation √((a*2−a*1)2+(b*2−b*1)2), with a*1, and b*1 representing the coordinates of the article when viewed at normal incidence and a*2, and b*2 representing the coordinates of the article when viewed at the incident illumination angle.

8. The article of claim 1 , wherein the article exhibits:
a reflected angular color shift of about 12 or less for at least one incident illumination angle that is 20 degrees or greater, referenced to normal incidence, under an International Commission on Illumination illuminant selected from the group consisting of A series illuminants, B series illuminants, C series illuminants, D series illuminants, and F series illuminants, wherein angular color shift is calculated using the equation √(a*2−a*1)2+(b*2−b*1)2), with a*1, and b*1 representing the coordinates of the article when viewed at normal incidence and a*2, and b*2 representing the coordinates of the article when viewed at the incident illumination angle.

9. The article of claim 8 , wherein the article exhibits:
a reflected angular color shift of about 12 or less at for all incident illumination angles from 0 degrees to 60 degrees, referenced to normal incidence, under an International Commission on Illumination illuminant selected from the group consisting of A series illuminants, B series illuminants, C series illuminants, D series illuminants, and F series illuminants, wherein angular color shift is calculated using the equation √(a*2−a*1)2+(b*2−b*1)2), with a*1, and b*1 representing the coordinates of the article when viewed at normal incidence and a*2, and b*2 representing the coordinates of the article when viewed at the incident illumination angle.

10. The article of claim 8 , wherein the article exhibits an angular color shift of about 6 or less at all incident illumination angles in the range from about 20 deg

Assignees

• Corning Inc

Inventors

• Hart Shandon Dee
• Koch Iii Karl William
• Kosik Williams Carlo Anthony
• Lin Lin
• Paulson Charles Andrew
• Price James Joseph

Classifications

• G02C7/107

  Interference colour filters · CPC title

• G02B1/115 Primary

  Multilayers · CPC title

• G06F3/067

  Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS] · CPC title

• C03C3/091

  containing aluminium · CPC title

• G06F3/0631 Primary

  by allocating resources to storage systems · CPC title