Back to results
US 7,248,714 B2Granted
Micro-speaker and method for assembling a micro-speaker
AssigneeFerrotec Corporation
InventorShiro Tsuda
Life of this patent
Estimating the term…
Abstract
The micro-speaker includes a driver unit having a housing, a magnet disposed within the housing forming a radial gap between the magnet and the circumferential walls of the housing, and a magnetic plate disposed on the magnet, a vibration system having a diaphragm and a voice coil where the vibration system is fixed to the drive unit and the voice coil protrudes into the radial gap, and a volatile magnetic fluid in the radial gap about the voice coil.
Claims6
A micro-speaker comprising:
- a driver unit having a support frame with a central portion forming a housing, a magnet secured on one end to a bottom of said housing such that a radial gap is formed between said magnet and a circumferential wall of said housing, and a magnetic plate secured to the other end of said magnet;
- a vibration system having a diaphragm and a voice coil attached to one side of said diaphragm wherein said vibration system is fixed to said driver unit and said voice coil is suspended in said radial gap;
- and
- a volatile magnetic fluid temporarily disposed in said radial gap about said voice coil, said volatile magnetic fluid having a volatile carrier liquid.
1 more element
Dependencies are inferred from the claim text.