Dome type diaphragm and loudspeaker apparatus

Details Dome type diaphragm and loudspeaker apparatus Dome type diaphragm and loudspeaker apparatus

2007-07-17

2007-07-17

Le, Huyen (Department: 2615)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S398000

Reexamination Certificate

active

11023446

ABSTRACT:
A loudspeaker apparatus includes a frame having an opening portion, a magnetic circuit constructed within the opening portion, a voice coil27in which a rear opening end portion is inserted into a magnetic gap of the magnetic circuit, a dome type diaphragm covered over the front opening end portion of the voice coil, and an edge for holding an outer peripheral portion of the voice coil freely vibratingly, with the outer peripheral edge attached on an opening portion of the frame. A reinforcing portion formed at an outer peripheral edge of the dome type diaphragm is formed of a flat portion and a cone portion, and has a shape of being folded back in a sound radiating direction toward a front.

REFERENCES:
patent: 3955055 (1976-05-01), Kawakami et al.
patent: 6154556 (2000-11-01), Takahashi et al.
patent: 2004/0170297 (2004-09-01), Hikichi
patent: 2-312396 (1990-12-01), None

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