Patent ID: 9485581
Filing Date: 2016-11-01
CPC Classification: H04R

Claim Text:
1. A manufacturing method of a flat planar diaphragm arrangement for a speaker, comprising the steps of: (a) mold injecting a raw material to form a middle foaming layer, wherein said raw material is polypropylene material and said middle foaming layer has a planar configuration; (b) applying two adhering films onto two opposed sides of said middle foaming layer respectively; and (c) forming first and second layers, and adhering and sandwiching said middle foaming layer between said first and second layers to form a flat speaker diaphragm in a planar configuration, wherein said first and second layers are made of different materials of said middle foaming layer, and a thickness of said middle foaming layer is larger than a thickness of each of said first and second layers.