Helmet with built-in speaker system and speaker system for...

Details Helmet with built-in speaker system and speaker system for... Helmet with built-in speaker system and speaker system for...

2006-10-31

2006-10-31

Mei, Xu (Department: 2615)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electrostrictive, magnetostrictive, or piezoelectric

C381S173000, C310S327000, C310S348000

Reexamination Certificate

active

07130436

ABSTRACT:
A speaker system is installed in a helmet, and includes a pair of piezoelectric speakers, frames supporting the speakers around the peripheral edges thereof, and laminated films for protecting the piezoelectric film speakers. Each of the frames has its longer sides curved with a radius of curvature of 210 mm to 360 mm in order to support the piezoelectric film speakers in a curved state similarly to the frame.

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