Patent ID: 11930342
Assignee: DOLBY LABORATORIES LICENSING CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An electro-acoustic transducer, comprising:
a supporting frame with a substantially circular front edge,
a magnet assembly mounted in the frame, the magnet assembly including an annular yoke surrounding a magnet,
a diaphragm attached to the front edge of the supporting frame;
a voice coil suspended by the diaphragm in a gap formed between the magnet and the annular yoke, said voice coil being axially movable with respect to the magnet; and
an annular damper arranged to stabilize the diaphragm, the annular damper being formed with concentric corrugations, an outer perimeter of said annular damper being attached to said supporting frame;
wherein said transducer further comprises a damper holder having a substantially flat annular portion attached to the diaphragm, and a conical wall portion extending from an outer perimeter of the annular portion away from the diaphragm and radially out from the annular portion, so that said conical wall portion surrounds the voice coil;
wherein an inner perimeter of said damper is attached to a rear region of said conical wall portion,
wherein the voice coil includes a coil wire wound around a cylindrical coil former,
wherein one end of said coil wire extends between the damper holder and the voice coil former, and between the damper holder and the diaphragm, to a location on an outside of said conical wall,
wherein said transducer further comprises a lead wire having a first end electrically connected to said coil wire end, and a second end electrically connected to an electric terminal in said frame, and
wherein the conical wall of the damper holder is provided with one or several openings.