Speaker diaphragm and speaker apparatus
US11350216B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2017 |
| Grant date | May 31, 2022 |
| Priority date | — |
| Expiry date | Jul 16, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R9/022
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A speaker apparatus includes: a magnetic circuit including an annularly formed magnet, a yoke that includes a base surface part and a center pole part protruding from the base surface part, the center pole part being disposed while being inserted into a central part of the magnet, and a plate that is annularly formed and disposed on an outer peripheral side of the center pole part of the yoke while being attached to the magnet; a coil bobbin that is cylindrically formed and is displaceable in an axial direction of the center pole part while a part thereof is fitted onto the center pole part of the yoke; a voice coil that is wound around an outer peripheral surface of the coil bobbin, at least a part thereof being disposed in a magnetic gap formed between the plate and the center pole part of the yoke; and a diaphragm that is connected to the coil bobbin and is caused to vibrate in conjunction with displacement of the coil bobbin, in which a first air passage path and a second air passage path are formed, the first air passage path leading from a back surface side of the diaphragm to a lower surface of the magnetic circuit, the second air passage path being formed in the lower surfa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.