Light diffusing component and a method of manufacturing a light diffusing component

• US 10,295,728 B2
• Filed: 10/21/2015
• Issued: 05/21/2019
• Est. Priority Date: 10/23/2014
• Status: Active Grant

• Current Assignee: Corning Incorporated
• Original Assignee: Corning Incorporated
• Inventors: Etienne, Michael, Fenton, Matthew Wade, Myers, Timothy Edward, Wexell, Kathleen Ann
• Primary Examiner(s): Santiago, Mariceli
• Application Number:
  US15/521,145
• Publication Number:
  US 20170336556A1
• Time in Patent Office: 1,308 Days
• 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 5/0263 with positional variation of the diffusing properties, e.g. gradient or patterned diffuser
• CPC Class Codes: G02B 5/0268 characterized by the fabrication or manufacturing method
• CPC Class Codes: G02B 6/0043 provided on the surface of the light guide
• CPC Class Codes: G02B 6/0061 to provide homogeneous light output intensity
• CPC Class Codes: G02B 6/0065 Manufacturing aspects; Material aspects

Abstract

A light diffusing component is disclosed. The light diffusing component comprises a substrate, such as glass, having a frontside, a backside spaced apart from the frontside, and an edge configured to receive a light source. The glass sheet includes at least one scattering layer having a plurality of light scattering centers etched into at least a portion of the frontside of the glass sheet. The scattering centers have an increased density as the distance from the edge increases and the scattering centers are randomly distributed in size and smaller than about 200 μm. Also disclosed is a method of manufacturing a light diffusing component comprising masking a substrate, such as a glass sheet, and etching the substrate such that the density of the resulting scattering centers increased as the distance from the light source increases.

Claims

1. A method of producing a light diffusing component comprising:

creating a pattern of scattering centers on at least a portion of a first surface of a substrate;

the substrate further comprising an edge, the edge configured to receive a light source;

the pattern having a lesser density of scattering centers adjacent the edge and a greater density of scattering centers as the distance from the edge increases, the creating step comprising;

depositing a masking material on the first surface to create a mask on the first surface;

adhering the mask to the first surface; and

etching the first surface;

wherein the masking material is ink and wherein the depositing step comprises depositing a first layer of ink having a uniform density and depositing a second layer of ink having a greater density of ink adjacent the edge and reducing the density of the ink as the distance from the edge increases.

2. The method of producing a light diffusing component of claim 1 wherein the substrate is a glass sheet.

3. The method of producing a light diffusing component of claim 1 wherein during the depositing step, ink is deposited through an ink nozzle and the density of the second layer of ink deposited during the depositing step is controlled by varying ink thickness, varying ink color, varying the ink nozzle height, or varying the ink nozzle speed.

4. The method of producing a light diffusing component of claim 1 wherein the adhering step comprises the step of curing the masking material in a manner to permit lessened etching adjacent the edge and permit increased etching as the distance from the edge increases.

5. The method of producing a light diffusing component of claim 4 wherein the curing is controlled by varying the temperature of the curing.

6. The method of producing a light diffusing component of claim 1 wherein the etching step comprises etching the first surface to create a gradient of density of scattering centers with a decreased density of scattering centers adjacent the edge and an increased density of scattering centers as the distance from the edge increases.

7. The method of producing a light diffusing component of claim 1 wherein the etching step is performed in an etch bath that comprises a mixture of glacial acetic acid (GAA) and ammonium fluoride (NH4F).

8. The method of producing a light diffusing component of claim 1 wherein the glass sheet further comprises a second surface, the second surface is spaced apart from the first surface, and further comprising laminating the second surface prior to the creating step, and cleaning the second surface after the creating step.

9. The method of producing a light diffusing component of claim 1 further comprising cleaning the first surface after the creating step.

10. The method of producing a light diffusing component of claim 1 further comprising cleaning the first surface after the creating step.

11. A method of producing a light diffusing component comprising:

creating a pattern of scattering centers on at least a portion of a first surface of a substrate;

the substrate further comprising an edge, the edge configured to receive a light source;

the pattern having a lesser density of scattering centers adjacent the edge and a greater density of scattering centers as the distance from the edge increases, the creating step comprising;

depositing a masking material on the first surface to create a mask on the first surface;

adhering the mask to the first surface; and

etching the first surface;

wherein the adhering step comprises curing the masking material to permit lessened etching adjacent the edge and permit increased etching as the distance from the edge increases and the curing is controlled by varying the temperature of the curing.

12. The method of producing a light diffusing component of claim 11 wherein the substrate is a glass sheet.

13. The method of producing a light diffusing component of claim 11 wherein the depositing step comprises depositing a greater density of masking material adjacent the edge and reducing the density of the masking material as the distance from the edge increases.

14. The method of producing a light diffusing component of claim 11 wherein the masking material is ink.

15. The method of producing a light diffusing component of claim 14 wherein the ink is deposited with an inkjet printer, the inkjet printer depositing ink droplets comprising small dye particles randomly distributed in size.

16. The method of producing a light diffusing component of claim 14 wherein during the depositing step, ink is deposited through an ink nozzle and the density of the ink deposited during the depositing step is controlled by varying ink thickness, varying ink color, varying the ink nozzle height, or varying the ink nozzle speed.

17. The method of producing a light diffusing component of claim 11 wherein the etching step comprises etching the first surface to create a gradient of density of scattering centers with a decreased density of scattering centers adjacent the edge and an increased density of scattering centers as the distance from the edge increases.

18. The method of producing a light diffusing component of claim 11 wherein the etching step is performed in an etch bath that comprises a mixture of glacial acetic acid (GAA) and ammonium fluoride (NH4F).