Sensor assembly for measuring diaphragm displacement and temperature in a micro speaker
US9967664B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 2017 |
| Grant date | May 8, 2018 |
| Priority date | — |
| Expiry date | May 22, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2499/15
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A micro speaker assembly including a micro speaker having a top plate, a bottom plate parallel to the top plate, a magnet assembly coupled to one of the top plate or the bottom plate, a compliant member positioned between the magnet assembly and the top plate or the bottom plate, the compliant member operable to be displaced in response to an acoustic input, and a voice coil coupled to the compliant member. The assembly further including an optical sensor coupled to the micro speaker, the optical sensor having a light emitter and a light detector, the light emitter and the light detector being fixedly coupled to the top plate or the bottom plate, and the optical sensor being operable to produce a displacement signal corresponding to a displacement of the compliant member and a temperature signal corresponding to a temperature of the magnet assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.