Speaker unit for earphone
US11290825B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 2021 |
| Grant date | Mar 29, 2022 |
| Priority date | — |
| Expiry date | Feb 1, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R9/063
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A speaker unit for an earphone may include a frame; a magnet; a first plate fixed to the frame and in contact with one side of the magnet; a second plate fixed to the frame and in contact with the other side of the magnet; a first coil and a second coil that are disposed to overlap the magnet and the plate in a radial direction; a first diaphragm disposed in front of the magnet and having the first coil fixed thereto; a second diaphragm disposed behind the magnet; and a flexible printed circuit board (FPCB), wherein the FPCB includes a first region including a first contact point connected to the first coil and a second region including a second contact point connected to the second coil and in a front-to-rear direction, the first region is disposed to overlap the first diaphragm in a front-to-rear direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.