Dome-shaped diaphragm and speaker

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic

Reexamination Certificate

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C381S423000

Reexamination Certificate

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07577270

ABSTRACT:
A dome-shaped diaphragm includes a dome part which is formed in a dome-like shape and is convex forward in an oscillating direction, a neck part which is provided in continuation to an outer periphery of the dome part, and an edge including a roll part which is formed in a curved shape and is convex forward in the oscillating direction, and continued to the neck part at an inner peripheral edge thereof, wherein the neck part is provided with a curved portion which is convex backward in the oscillating direction, and an outer periphery of the curved portion is smoothly continued to an inner periphery of the roll part.

REFERENCES:
patent: 3513270 (1970-05-01), Warning
patent: 6154556 (2000-11-01), Takahashi et al.
patent: 6320972 (2001-11-01), Goller
patent: 55-150581 (1980-10-01), None
patent: 2002-32790 (2003-01-01), None
Japanese Notification of Reason for Refusal dated Apr. 28, 2009, English language Translation.

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