Earphone device
US8942405B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 2013 |
| Grant date | Jan 27, 2015 |
| Priority date | — |
| Expiry date | Apr 22, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R25/652
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An earphone device comprises an inner casing enclosing one or more miniature drive units, and a movable cap or outer casing that moves relative to the inner casing. The inner casing has an extension member, such as a hollow post, terminating in an acoustic output port. A compressible foam bulb at least partially surrounds the extension member, and is decompressed and compressed by actuation of an adjustable member. The adjustable member may take the form, for example, of a pivoting lever, a helical cam, or a push-rod mechanism, among other things. A flange may be disposed around the periphery of the movable cap, in order to provide a seal surrounding the ear canal region. The compressible material may be gripped by the hollow extension member, and abut the movable cap or flange. Through actuation of the adjustable member, the compressible material may be decompressed and thus elongated for insertion into the wearer's ear, and may be compressed and thus widened or expanded to form an adequate seal with the wearer's ear canal region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.