Glass substrates with strategically imprinted B-side features and methods for manufacturing the same

US9676649B2 · kind B2 · utility

Assignee

• CORNING INCORPORATED · US

Inventors

• Michael S. Dobbins · Corning, US
• James Robert Lim · San Jose, US
• Hung Cheng Lu · Ithaca, US
• Wanda Janina Walczak · Big Flats, US
• Liming Wang · Beijing, CN
• Ruchirej Yongsunthon · Corning, US

Key dates

• Filing date: Aug 26, 2011
• Grant date: Jun 13, 2017
• Expiry date: Jan 13, 2035

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/24355
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Glass substrates and methods for forming glass substrates are disclosed. The glass substrates include a planar A-side surface having a surface roughness Ra1 of less than 0.5 nm and a planar B-side having a surface roughness Ra2 wherein the ratio Ra2:Ra1 is greater than or equal to about 1.5. A plurality of texturing features are formed in the B-side surface. The plurality of texturing features have a peak-to-valley height H such that 0.05 μm≦H≦3.75 μm. The texturing features are distributed in the B-side surface such that a center-to-center pitch P between adjacent texturing features is at least 1.5 mm in at least one direction. The plurality of texturing features are formed in the B-side surface while the glass substrate is at a temperature T1, wherein 600° C.≦T1≦1200° C. and a viscosity of the glass substrate is from greater than 150,000 Poise and less than 1013 Poise.