LED light bulb having filament with lighting face of LED chip located in the lower surface of top layer
US10868225B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2019 |
| Grant date | Dec 15, 2020 |
| Priority date | — |
| Expiry date | Sep 20, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/8513
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An LED light bulb, comprising of: a lamp housing; a bulb base connected to the lamp housing; a stem connected to the bulb base and located in the lamp housing, the stem comprises a stand extending to the center of the lamp housing; a single LED filament, disposed in the lamp housing, the LED filament comprising: a light conversion layer, coated on at least two sides of the LED chip and the conductive electrodes, and a portion of each of the conductive electrodes is not coated with the light conversion layer, the light conversion layer has at least one top layer and one base layer, the top layer and the base layer are disposed on the opposing surface of the LED chip, wherein the light emitting surface of the LED chips overlaps with the center of the top layer; and two conductive supports, respectively connected with the stem and the LED filament.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.