Loudspeaker

Details Loudspeaker Loudspeaker

1999-07-13

2001-02-13

Le, Huyen (Department: 2743)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S423000, C381S405000, C181S163000

Reexamination Certificate

active

06188774

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a loudspeaker used in various audio/visual appliances.
BACKGROUND ART
In order to make a space required for installing a loudspeaker system smaller, there has been a strong voice in the market requesting a flat loudspeaker. A number of new creations have so far been announced for meeting the request.
A conventional flat loudspeaker is described below referring to
FIG. 9
, which shows a cross sectional side view.
As shown in
FIG. 9
, a damper
9
, which is provided at a place inner from a magnetic gap
5
, is not coupled direct with a voice coil
8
, but the outer circumferential edge is connected to a plate
4
while the central portion is connected to a protrusion of a diaphragm
15
coming downward from the central part of the diaphragm. Thus, a cavity made available within the inner circumference of a magnet
2
is utilized as a space
6
for damper amplification. A loudspeaker can be fabricated in a thinner configuration adopting the above-described structure.
A magnetic circuit
1
is consisted of a magnet
2
, a yoke
3
and a plate
4
. Between the yoke
3
and the plate
4
is a magnetic gap
5
. A frame
7
is fixed to the yoke
3
. Voice coil
8
is connected to the diaphragm
15
at one end, while the other end is adapted to the magnetic gap
5
. An edge
10
is connected at the inner circumference with the outer circumferential portion of the diaphragm
15
, and the outer circumference of edge is connected with the inner rim section of the frame
7
.
In assembling the above described conventional loudspeaker, the voice coil
8
has to be inserted to a right position in the magnetic gap
5
in a state where the voice coil
8
was already integrated with the diaphragm
15
. Therefore, there is a substantially high possibility that the voice coil
8
is disposed oblique and/or eccentric to the magnetic gap
5
. This leads to a possibility for the coil of the voice coil
8
coming in touch with the plate
4
or the yoke
3
, which generates abnormal sounds.
The present invention addresses the above problem, and aims to present a loudspeaker improving the trade-off between the flat contour and the low rejection rate.
DISCLOSURE OF THE INVENTION
In an invented loudspeaker, 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, the outer circumferential portion of said sub-diaphragm is connected with the upper surface of the main diaphragm at a location outer than a point where the main diaphragm is connected to the voice coil. With the above described structure, the main diaphragm is placed and connected between the frame and the voice coil while the voice coil is being held at a right positioning in the magnetic gap with the aid of a spacer or the like positioning jig. Therefore, the problem that abnormal sounds are generated by the coil of voice coil coming in contact with the plate or the yoke can be avoided.


REFERENCES:
patent: 2231479 (1941-02-01), Perry
patent: 4320264 (1982-03-01), Visan et al.
patent: 5933512 (1999-08-01), Tamura
patent: 6-111399 (1981-09-01), None
patent: 56-163394 (1981-12-01), None
patent: 1-78494 (1989-05-01), None
patent: 4-192800 (1992-07-01), None

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