Patent ID: 11969771
Assignee: GUANGDONG UNIVERSITY OF TECHNOLOGY
Field: Chemical engineering (Chemistry)
Classification: CPC B  G  Y | IPC B  G

Claim 0:
1. A method of fabricating a film vibration device, comprising:
(S1) forming a circular-hole array on a surface of a silicon wafer by photoetching;
(S2) etching an aluminum layer on the silicon wafer;
(S3) etching the silicon wafer to form a through-hole array, so as to obtain a porous silicon wafer;
(S4) attaching a polyethylene terephthalate (PET) sheet to a side of the porous silicon wafer; and subjecting the PET sheet to breakdown with the porous silicon wafer as a mask to obtain a porous PET film;
(S5) attaching a polyvinylidene fluoride (PVDF) film to a lower side of the porous silicon wafer; performing vacuumization above the porous silicon wafer, and simultaneously heating the PVDF film below the porous silicon wafer such that a plurality of dome micro-structures are formed on the PVDF film; and
(S6) laminating the porous PET film on each of two sides of the PVDF film having the plurality of dome micro-structures to obtain the film vibration device;
wherein in step (S5), the heating is performed through three annealing-cooling operations, each comprising:
heating a bottom of the PVDF film at 75-85° C. for 4-6 min; and cooling the PVDF film to room temperature while keeping vacuum above the PVDF film.