Durable and scratch-resistant anti-reflective articles
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G02B-001/11
G02B-001/14
G02B-005/02
출원번호
US-0706505
(2015-05-07)
등록번호
US-9335444
(2016-05-10)
발명자
/ 주소
Hart, Shandon Dee
Koch, III, Karl William
Paulson, Charles Andrew
Price, James Joseph
출원인 / 주소
CORNING INCORPORATED
대리인 / 주소
Patel, Payal A.
인용정보
피인용 횟수 :
5인용 특허 :
112
초록▼
Embodiments of durable, anti-reflective articles are described. In one or more embodiments, the article includes a substrate and an optical coating disposed on the major surface. The optical coating includes an anti-reflective coating and a scratch-resistant coating forming an anti-reflective surfac
Embodiments of durable, anti-reflective articles are described. In one or more embodiments, the article includes a substrate and an optical coating disposed on the major surface. The optical coating includes an anti-reflective coating and a scratch-resistant coating forming an anti-reflective surface. The article exhibits a maximum hardness of 12 GPa or greater, as measured on the anti-reflective surface by a Berkovich Indenter Hardness Test along an indentation depth of about 100 nm or greater. The articles of some embodiments exhibit a single side average light reflectance measured at the anti-reflective surface of about 8% or less over an optical wavelength regime in the range from about 400 nm to about 800 nm and a reference point color shift in transmittance or reflectance of less than about 2. In some embodiments, the article exhibits an angular color shift of about 5 or less at all angles from normal incidence to an incident illumination angle that is 20 degrees or greater.
대표청구항▼
1. An article comprising: a substrate having a major surface; andan optical coating disposed on the major surface and forming an anti-reflective surface, the optical coating comprising an anti-reflective coating,the article exhibiting a maximum hardness of about 12 GPa or greater as measured on the
1. An article comprising: a substrate having a major surface; andan optical coating disposed on the major surface and forming an anti-reflective surface, the optical coating comprising an anti-reflective coating,the article exhibiting a maximum hardness of about 12 GPa or greater as measured on the anti-reflective surface by a Berkovich Indenter Hardness Test along an indentation depth of about 100 nm or greater;wherein the article exhibits a single side average light reflectance measured at the anti-reflective surface of about 8% or less over an optical wavelength regime in the range from about 400 nm to about 800 nm and either one or both of: 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 2 from a reference point as measured at the anti-reflective surface, the reference point comprising at least one of the color coordinates (a*=0, b*=0) and the transmittance color coordinates of the substrate, andarticle reflectance 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 5 from a reference point as measured at the anti-reflective surface, the reference point comprising at least one of the color coordinates (a*=0, b*=0), the color coordinates (a*=−2, b*=−2), 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 (a*=−2, b*=−2), the color shift is defined by √((a*article+2)2+(b*article+2)2), andwherein, 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. The article of claim 1, wherein the article exhibits an angular color shift of about 5 or less at an 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. 3. The article of claim 2, wherein the article exhibits an angular color shift of about 5 or less at all incident illumination angles in the range from about 20 degrees to about 60 degrees. 4. The article of claim 2, wherein the substrate has a hardness less than the maximum hardness of the article. 5. The article of claim 1, wherein the article exhibits an abrasion resistance after a 500-cycle abrasion using a Taber Test on the anti-reflective surface comprising any one or more of about 1% haze or less, as measured using a hazemeter having an aperture, wherein the aperture has a diameter of about 8 mm,an average roughness Ra, as measured by atomic force microscopy, of about 12 nm or less,a scattered light intensity of about 0.05 (in units of 1/steradian) or less, at a polar scattering angle of about 40 degrees or less, as measured at normal incidence in transmission using an imaging sphere for scatter measurements, with a 2 mm aperture at 600 nm wavelength, anda scattered light intensity of about 0.1 (in units of 1/steradian) or less, at a polar scattering angle of about 20 degrees or less, as measured at normal incidence in transmission using an imaging sphere for scatter measurements, with a 2 mm aperture at 600 nm wavelength. 6. The article of claim 1, wherein the anti-reflective coating comprises a plurality of layers, wherein the plurality of layers comprises a first low RI layer, and a second high RI layer. 7. The article of claim 6, wherein the anti-reflective coating comprises a plurality of periods such that the first low RI layer and the second high RI layer alternate. 8. The article of claim 7, wherein the anti-reflective coating comprises up to about 10 periods. 9. The article of claim 1, wherein the single side average light reflectance is about 2% or less over the optical wavelength regime at a viewing angle in the range from about 6 degrees to about 40 degrees. 10. The article of claim 1, wherein the substrate comprises an amorphous substrate or a crystalline substrate. 11. The article of claim 10, wherein the amorphous substrate comprises a glass selected from the group consisting of soda lime glass, alkali aluminosilicate glass, alkali containing borosilicate glass and alkali aluminoborosilicate glass. 12. The article of claim 11, wherein the glass is chemically strengthened and comprises a compressive stress (CS) layer with a surface CS of at least 250 MPa extending within the chemically strengthened glass from a surface of the chemically strengthened glass to a depth of layer (DOL) of at least about 10 μm. 13. The article of claim 1, further comprising an easy-to-clean coating, a diamond-like coating or a scratch-resistant coating disposed on the optical coating. 14. The article of claim 1, wherein the optical coating comprises a scratch resistant layer having a thickness in the range from about 1 micrometer to about 3 micrometers. 15. The article of claim 14, wherein the anti-reflective coating is disposed between scratch resistant layer and the substrate. 16. The article of claim 14, wherein the scratch resistant layer is disposed between the substrate and the anti-reflective coating. 17. The article of claim 14, wherein the anti-reflective coating comprises a first portion and a second portion, and wherein the scratch resistant layer is disposed between the first portion and the second portion.
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