Acoustics – Diaphragm – Particular shape
Reexamination Certificate
2007-12-11
2007-12-11
Donovan, Lincoln (Department: 2837)
Acoustics
Diaphragm
Particular shape
C181S157000, C181S161000, C181S164000, C181S166000, C181S167000, C381S398000, C381S162000, C381S423000, C381S430000, C381S424000, C381S432000, C381S431000, C381S392000
Reexamination Certificate
active
10535297
ABSTRACT:
A membrane (20) has a membrane axis (5) and a middle area (50), a central cup-shaped depression (52) being provided around said membrane axis (5), which depression (52) preferably has a connecting channel (53), wherein the middle area (50) comprises groups of stiffening grooves (54, 55, 56, 57) which extend parallel to radial directions and of which a first group of long stiffening grooves (54, 55, 56) extends up to the depression (52), said connecting channel (53) issuing into two of the long stiffening grooves (55, 56), thus interconnecting these two long stiffening grooves (55, 56).
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Donovan Lincoln
NXP B.V.
Philips Forrest
Zawilski Peter
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