Mobile communication terminal and electro-acoustic transducer used for the same
US7113813B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 2002 |
| Grant date | Sep 26, 2006 |
| Priority date | — |
| Expiry date | Jul 29, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/0214
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A portable communication terminal employs an electro-acoustic transducer having openings on the housing. The openings of the transducer are coupled to a housing of the terminal or acoustic pipes unitarily formed with the housing of the transducer. An opening of the acoustic pipe faces an opening provided in the housing of the terminal. The terminal uses a transducer including a diaphragm, a cover closely jointed to an outer periphery of the diaphragm and facing a front face of the diaphragm, and a frame provided at a rear face of the diaphragm. The terminal and the transducer consume less power and yet radiate greater output sound pressure with smaller bodies. They can deliver sound from a display section, so that a user accepts the sound normally.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.