Shutter covered on sound hole of loudspeaker module and assembling method thereof, loudspeaker module

An assembling method of a blocking piece covering the sound hole of a loudspeaker module, wherein the assembling method comprises the following steps of:

• (1) forming a substrate, wherein a plurality of hollow holes are arranged on the substrate;
• (2) preparing a nonmetallic flexible mesh ribbon, attaching the flexible mesh ribbon to the substrate and having all the hollow holes covered with the flexible mesh ribbon;
• (3) putting the substrate attached with the flexible mesh ribbon in a first injection moulding mold, and forming by injection moulding a plurality of annular first injection moulding bodies on the flexible mesh ribbon portions covering the plurality of hollow holes, wherein the annular first injection moulding bodies are integrated with the flexible mesh ribbon portions;
• (4) obtaining a plurality of separate first injection moulding parts by cutting the flexible mesh ribbon from the peripheries of the first injection moulding bodies, wherein each first injection moulding part comprises a first injection moulding body and a blocking piece, the blocking piece is integrated with the first injection moulding body and cut from the flexible mesh ribbon;
• (5) putting the first injection moulding part in a second injection moulding mold, and forming in a second injection moulding process the case of a loudspeaker module integrated with the first injection moulding part, wherein the inner hole of the first injection moulding body forms the sound hole of the loudspeaker module.