Light emitting diode tube lamp including glass lamp tube with self diffusive tube glass and method of forming self diffusive glass using chemical etching

Patent metadata

Field	Value
Publication number	US-10465858-B2
Application number	US-201715720106-A
Country	US
Kind code	B2
Filing date	Sep 29, 2017
Priority date	Sep 29, 2017
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

A method of lamp assembly that etching a glass tube body to increase a texture of the surface of the sidewall of the glass tube body, the sidewall of the glass tube body enclosing a hollow interior; and positioning a circuit board including a plurality of light emitting diodes (LEDs) within the hollow interior of the glass tube, wherein the increase in the texture of the surface increases the light diffusivity of the glass tube body.

First claim

What is claimed is:

1. A lamp comprising:
a glass tube body having a perimeter defined by a sidewall of the glass tube body for enclosing a hollow interior, that glass tube body having an exterior surface and an interior surface, in which the exterior surface and the interior surface of the sidewall are textured to increase light diffusivity; and
at least one light emitting diode (LED) comprising a substrate that provides the light positioned within the hollow interior of the glass tube body.

2. The lamp of claim 1 , wherein the substrate is a circuit board having sidewalls engaged to the sidewall of the glass tube body.

3. The lamp of claim 1 , wherein said exterior surface has a first roughness that has a root mean square (RMS) roughness greater than 250 nm and smaller than 1.5 microns.

4. The lamp of claim 3 , wherein said interior surface has a second roughness that has an root mean square (RMS) roughness greater than 250 nm and smaller than 1.5 microns.

5. The lamp of claim 4 , wherein said textured surface on exterior surface having said first roughness is substantially equal to a said texture on said interior surface having said second roughness.

6. The lamp of claim 4 , wherein said textured surface that provides at least one of said first roughness and said second roughness includes a plurality of scallops defined by a peaked upper surface and tapered sidewalls extending to a base having a greater width than the peaked upper surface of the scallops.

7. The lamp of claim 4 , wherein said texture that provides at least one of said first roughness and said second roughness includes a plurality of plateaus each including surface projections having an inverted v-shaped side cross-sectional geometry, the upper surface of the projection provided by the apex of the inverted v-shape.

Assignees

• Rioux Philip
• Zhang Shiyong
• Ledvance Llc

Inventors

• Rioux Philip
• Zhang Shiyong

Classifications

• F21V19/009

  the support means engaging the vessel of the source · CPC title

• F21K9/27 Primary

  Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21V3/049

  Patterns or structured surfaces for diffusing light, e.g. frosted surfaces · CPC title

• F21K9/66

  Details of globes or covers forming part of the light source · CPC title