Method for strengthening cover lens

• US 10,261,218 B2
• Filed: 08/21/2018
• Issued: 04/16/2019
• Est. Priority Date: 09/29/2014
• Status: Active Grant

• Current Assignee: Buwon Precision Sciences Co., Ltd.
• Original Assignee: Buwon Precision Sciences Co., Ltd.
• Inventors: Ahn, Kyung-Chul
• Primary Examiner(s): Shafer, Ricky D
• Application Number:
  US16/107,516
• Publication Number:
  US 20190011606A1
• Time in Patent Office: 238 Days
• Field of Search: 359513, 359900
• CPC Class Codes: B05D 3/104 Pretreatment of other substrates
• CPC Class Codes: B05D 5/00 Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
• CPC Class Codes: C03C 15/00 Surface treatment of glass, not in the form of fibres or filaments, by etching etching or surface-brightening compositions, in general C09K13/00
• CPC Class Codes: G02B 1/14 Protective coatings, e.g. hard coatings

Abstract

A strengthened cover lens is disclosed to include a substrate, including an upper surface, a lower surface substantially parallel to the upper surface, a side surface located between the upper surface and the lower surface, and the side surface being substantially perpendicular to the upper surface and the lower surface, an upper chamfer surface formed between the upper surface and the side surface and the upper chamfer surface being adjacent the side surface, a concave portion formed between the upper surface and the upper chamfer surface, and a protection layer covering at least the concave portion and the upper chamfer surface, and a method for strengthening a cover lens being durable for abrasive condition by rigid body such as metal in common use is also provided.

Claims

1. A method for strengthening a cover lens, the method comprising:

providing a substrate, the substrate comprising an upper surface, a lower surface substantially parallel to the upper surface, and a side surface locating adjacent to the upper surface and the lower surface, and substantially perpendicular to the upper surface and the lower surface;

forming an upper chamfer surface between the upper surface and the side surface;

covering acid-resistant layers on the upper surface and the lower surface, wherein the acid-resistant layer on the upper surface have defined a region for a concave portion on an edge of the upper surface which is predetermined to be etched;

acid-etching the upper surface of a glass article to form a concave portion between the upper surface and the upper chamfer surface; and

coating a protection layer to cover at least the concave portion and the upper chamfer surface using a coating source in a coating direction,

wherein the protection layer further covers the side surface.

2. The method for strengthening a cover lens of claim 1, wherein the coating direction is tilted with an tilt angle relative to an imaginary line from the lower surface straight to the upper surface in a cross-section view, a horizontal component of the coating direction is from an outside to an inside of the upper surface, and a vertical component of the coating direction is from the upper surface to the lower surface, and the tilt angle is in a range from about 30 degrees to about 60 degrees.

3. The method for strengthening a cover lens of claim 2, wherein the using of the coating source comprising a needle injection, a jet spray, or a drum type coating.

4. The method for strengthening a cover lens of claim 3, wherein the forming of the upper chamfer surface further comprising the forming of a lower chamfer surface between the lower surface and the side surface.

5. The method for strengthening a cover lens of claim 4, wherein the protection layer comprising polymer resin, and a resin hardness of the protection layer is durometer hardness of A80 to A100.

6. The method for strengthening a cover lens of claim 2, wherein an angle between the upper chamfer surface and the side surface is about 135 degrees.

7. The method for strengthening a cover lens of claim 2, wherein a first thickness from an outer periphery of the protection layer straight to the upper chamfer surface is within a range between about 30 μ

m to about 40 μ

m.

8. The method for strengthening a cover lens of claim 2, wherein a second thickness from an outer periphery of the protection layer straight to the side surface is within a range between about 60 μ

m to about 80 μ

m.

9. The method for strengthening a cover lens of claim 2, wherein a third thickness from an inner edge of the concave portion straight to an imaginary line through an outermost point on an outer periphery is in a range of about 100 μ

m to about 150 μ

m.

10. The method for strengthening a cover lens of claim 2, wherein an edge of the cover lens has a value of B10 above 550 MPa in 4-point bending test.