Filament bulb with uniform luminance

Patent metadata

Field	Value
Publication number	US-10473291-B2
Application number	US-201715599448-A
Country	US
Kind code	B2
Filing date	May 18, 2017
Priority date	Apr 24, 2017
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

Disclosed herein is a filament bulb with uniform luminance, which decreases the dark area at the top portion of the filament bulb and increases the luminance efficiency, and includes the following components, a bulb casing, a filament unit, a reflector ring, a driver, and a bulb cap. The bulb casing is connected with the bulb cap, and together, the two define an interior space. The driver is disposed in the bulb cap, whereas the filament unit is disposed within the interior space and the bottom of the filament unit is electrically connected with the driver. The reflector ring surrounds the exterior of the bottom of the filament unit, and is configured to reflect the light emitted from the filament unit to decrease the dark area at the top portion of the filament bulb.

First claim

What is claimed is:

1. A filament bulb, comprising, a bulb casing, a filament unit, a reflector ring, a driver and a bulb cap, wherein the bulb casing and the bulb cap are connected to define an interior space, the driver is disposed in the bulb cap, the filament unit is disposed in the interior space and the filament unit has a bottom that is electrically connected with the driver, and the reflector ring has an upper surface with a microstructure of bumps, wherein the reflector ring surrounds the exterior of the bottom of the filament unit and is configured to reflect the light emitted from the filament unit.

2. The filament bulb according to the claim 1 , wherein the bumps have a circular, elliptical, triangular, quadrangular, pentagonal, hexagonal, or irregular shape.

3. The filament bulb according to the claim 1 , wherein the bumps are arranged such that the sizes of bumps gradually increase from a portion proximal to the filament unit to a portion distal from the filament unit.

4. The filament bulb according to the claim 1 , wherein the reflector ring comprises a body, and wherein the body is made of one or more reflective materials.

5. The filament bulb according to the claim 4 , wherein the reflective material is aluminum foil.

6. The filament bulb according to the claim 4 , wherein the reflective material is formed on the upper surface of the body by painting, printing, bronzing, sputtering, or physical vapor deposition.

7. The filament bulb according to the claim 1 , wherein the reflector ring has a funnel or conical shape, or the reflector ring has a concave upper surface.

Assignees

• Xiamen Eco Lighting Co Ltd

Inventors

• Cao Liangliang
• Huang Xiaojuan
• Zeng Maojin
• Zhang Lianwei
• Li Wanzhen
• Su Lilei
• Fu Mingyan
• Chen Xiaobo

Classifications

• H01K1/28

  Envelopes; Vessels · CPC title

• F21K9/232 Primary

  specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb · CPC title

• F21V7/041 Primary

  with conical or pyramidal surface · CPC title

• F21V7/22

  characterised by materials, surface treatments or coatings, e.g. dichroic reflectors · CPC title

• H01K1/46

  supported by a separate part, e.g. base, cap · CPC title