Speaker device
US9820053B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 15, 2015 |
| Grant date | Nov 14, 2017 |
| Priority date | — |
| Expiry date | Jan 15, 2035 |
Classification
- Technology area (CPC —)General
Abstract
Acoustic conversion efficiency is improved and a stable signal reproduction operation is ensured. Provided is a speaker device including: a magnet; a yoke attached to the magnet and at least one sub-plate that is separated from the main plate in an axial direction of the central axis; a coil bobbin formed in a tubular shape and changeable in the axial direction; a voice coil wound around an outer circumferential surface of the coil bobbin, at least a portion of the voice coil being disposed in a main magnetic gap formed between the main plate and the yoke; a vibration plate having an inner circumferential portion connected to the coil bobbin; and a magnetic fluid filling at least one sub-magnetic gap formed between the sub-plate and the yoke, wherein a through-hole positioned in the sub-magnetic gap filled with the magnetic fluid is formed in the coil bobbin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.