Earphone nozzle comprising tractrix-curved acoustic passage
US9736570B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 8, 2014 |
| Grant date | Aug 15, 2017 |
| Priority date | — |
| Expiry date | Oct 8, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/1058
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An earphone includes a driver and a nozzle. The driver has a transducer diaphragm. The nozzle has an internal passage having an inlet opening, an outlet opening, and a wall connecting the inlet opening and the outlet opening. The wall has an inner surface within the passage. The inner surface extends from the inlet opening to the outlet opening. The outlet opening is smaller area than the inlet opening. The inner surface is configured, based on at least one tractrix, between the inlet opening and the outlet opening. The nozzle is attached to the driver with the transducer diaphragm facing the inlet opening and the inlet opening positioned nearer to the diaphragm than is the outlet opening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.