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JP2003078991

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2003078991
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates mainly
to a speaker used for receiving and expanding information communication equipment.
[0002]
2. Description of the Related Art A conventional loudspeaker will be described with reference to a
side sectional view of a small loudspeaker for mobile communication shown in FIG.
[0003]
As shown in the figure, 3 is a yoke made of a cylindrical magnetic material having a bottom
surface, 2 is a magnet which is adhered and fixed to the center of the bottom surface, 1 is
superimposed on the magnet 2 The magnetic circuit 8 is formed by the plate 1, the magnet 2 and
the yoke 3, and the outer periphery of the plate 1 of the magnetic circuit 8 and the yoke 3 are A
magnetic gap 8a is formed between the inner circumferences.
[0004]
Reference numeral 4 denotes a frame formed by insert-molding the yoke 3 (this frame 4 may be
separately resin-molded and the yoke 3 may be press-fitted to achieve integration with the yoke
3). It is a diaphragm in which the voice coil 6 fitted into the magnetic gap 8a is adhered and
fixed.
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[0005]
Reference numeral 7 denotes a protector provided with a plurality of small holes, which controls
the internal characteristics and the inflow of air flowing into the speaker to control acoustic
characteristics.
[0006]
The speaker configured as described above inputs the voice electric signal from the outside into
the voice coil 6 (the input means is not shown), and the voice coil 6 held in the magnetic gap 8a
is vertically The sound waves are emitted by driving the diaphragm 5 and moving the diaphragm
5 in response to the driving.
[0007]
Although it is desirable to improve the output sound pressure of the speaker in the speaker
having the above configuration, it is desirable to improve the sound pressure of the speaker
within the current shape. It is necessary to make the diameter of the plate 1 larger, but the weir 9
of the plate 1 is the obstacle.
The weir 9 is for preventing the adhesive used for bonding the plate 1 and the magnet 2 from
protruding into the magnetic gap 8a, and is provided in order to prevent the malfunction of the
voice coil 6.
[0008]
According to the present invention, the diameter of the magnet is enlarged to solve the abovementioned problems, and the sound pressure of the speaker is improved.
[0009]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to a
first aspect of the present invention, the inner periphery of the plate constituting the magnetic
circuit in the vicinity of the outer periphery of the contact surface with the magnet is made A
groove is provided in the plate, and the protrusion of the adhesive used to bond the plate and the
magnet is prevented by the groove, which makes it possible to abolish the weir provided on the
conventional plate, thereby increasing the diameter of the magnet It is possible to improve the
output sound pressure.
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[0010]
According to a second aspect of the present invention, a recess is provided substantially at the
center of the contact surface with the magnet according to the first aspect of the invention. The
adhesive of the present invention further improves the effect of preventing the protrusion.
[0011]
According to a third aspect of the present invention, the plate according to the first aspect is
processed so as to have a concave warp with respect to the contact surface with the magnet, as
in the second aspect. The concave portion due to the warp further improves the effect of
preventing the adhesive from protruding due to the variation in the adhesive application.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a loudspeaker according
to the present invention will be described below with reference to FIGS. 1 to 2B.
In the description, the same parts as those in the prior art will be assigned the same reference
numerals and explanations thereof will be simplified.
[0013]
(Embodiment 1) A speaker according to the present invention will be described with reference to
a small-sized speaker for mobile communication according to an embodiment.
FIG. 1 is a side sectional view of a small speaker, FIG. 2 (a) is a top view of a plate which is the
same main part, FIG. 2 (b) is a side sectional view of the same. 2 will be described.
[0014]
The difference between the prior art and the prior art will be described with reference to FIG. 1.
1a is a plate, 10 is an annular groove provided in the vicinity of the outer periphery of the plate
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1a in contact with the magnet 2a, and 11 is It is the hollow part provided in the center of the
contact surface side with the magnet 2a of the said plate 1a.
Reference numeral 12 denotes a magnetic circuit formed by the plate 1 a, the magnet 2 a and the
yoke 3.
[0015]
The adhesive used for adhesively bonding the plate 1a and the magnet 2a by the groove 10 is
accumulated in the groove 10 even by the pressure at the time of adhesive bonding and is
transferred to the magnetic gap 12a between the plate 1a of the magnetic circuit 12 and the
yoke 3 Overexposure will be prevented.
[0016]
Accordingly, since the protrusion of the adhesive is prevented by the groove 10, the wedge 9 of
the plate 1 of the conventional speaker is not required, the diameter of the magnet 2a can be
increased, and the output sound pressure as the speaker is increased. .
[0017]
When the magnet 2 is overlapped from above with the plate 1a facing downward and the
adhesive 2 is adhered and fixed, the recess 11 provided in the present embodiment is a stable
reservoir of the adhesive when the adhesive is applied. Become.
[0018]
It is also possible to use the warpage at the time of processing of the plate 1a instead of the
recess 11 of the above embodiment.
[0019]
That is, in general, the plate 1a is used by being punched out by press processing, but the
warping at the time of punching is used, and the punching direction is set so that the surface of
the plate 1a to be bonded to the magnet 2a is concave. Decide and punch out.
[0020]
As described above, by pressing the contact surface with the magnet 2a so as to be slightly
concave, the same effect as that of the recess 11 of the above embodiment is formed into a
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special shape of the press die. Can be obtained without.
[0021]
Incidentally, although the pressure is applied for adhering and fixing, the plate 1a is attracted to
the center by pulling the adhesive applied in an attempt to return to the warped state due to the
warpage, whereby The amount of expansion is suppressed, and the effect of preventing the
groove 10 from protruding to the magnetic gap 12 a is also enhanced.
[0022]
As described above, since the speaker of the present invention prevents the adhesive from
protruding into the magnetic gap by the groove provided on the plate, it is possible to eliminate
the wrinkles conventionally provided on the outer periphery of the plate, It is possible to expand
the diameter of the magnet without increasing the shape of the speaker, and to provide a speaker
in which the output sound pressure of the speaker is improved.
[0023]
Brief description of the drawings
[0024]
1 is a side sectional view of an embodiment of the speaker of the present invention
[0025]
Fig.2 (a) Top view of the plate which is the same principal part
[0026]
Fig. 3 Side sectional view of the conventional speaker
[0027]
Explanation of sign
[0028]
1a plate 2a magnet 3 yoke 4 frame 5 diaphragm 6 voice coil 10 groove 11 recess 12 magnetic
circuit 12a magnetic gap
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