Filament bulb with uniform luminance
US10473291B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 2017 |
| Grant date | Nov 12, 2019 |
| Priority date | — |
| Expiry date | May 18, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01K1/46
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.