Loudspeaker
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTakashi Sabato, Kazuhiro Oshika
Life of this patent
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Abstract
A flat loudspeaker of superior quality for use in audio appliances, in which loudspeaker the generation of abnormal sounds is eliminated by placing a voice coil with a high accuracy in the magnetic gap. A diaphragm is split into a main diaphragm (11) and a sub-diaphragm (12); a voice coil (8) is connected to the inner circumference of the main diaphragm (11) whose inner diameter is substantially identical with the diameter of the magnetic gap (5). In the loudspeaker, the voice coil (8) is placed in a right positioning without inclination and eccentricity relative to the magnetic gap (5), abnormal sounds are eliminated, and a thinner configuration and a lower rejection rate are made compatible.
Claims6
A loudspeaker, wherein
- an edge is connected at the outer circumferential portion with rim section of a frame fixed to a magnetic circuit;
- a main diaphragm is connected at the outer circumferential portion with the inner circumferential portion of the edge;
- a voice coil to be placed in a magnetic gap of the magnetic circuit is connected with the inner circumferential portion of the main diaphragm;
- a damper disposed at a place inner than the magnetic gap is fixed at the outer circumferential part with a plate of the magnetic circuit;
- the damper is connected at the central part with the central portion of a sub-diaphragm;
- and the outer circumferential portion of said sub-diaphragm is connected to the upper surface of the main diaphragm at a place outer than a point where the main diaphragm is connected with the voice coil.
Dependencies are inferred from the claim text.