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JP2002165291

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DESCRIPTION JP2002165291
[0001]
TECHNICAL FIELD The present invention relates to a speaker used in various mobile
communication devices.
[0002]
2. Description of the Related Art With the recent miniaturization of mobile communication
devices, the miniaturization of mobile communication speakers used therein is also desired.
[0003]
Here, a conventional speaker for mobile communication will be described with reference to FIG.
4 and FIG.
[0004]
Fig.4 (a) is a back surface front view of the conventional speaker for mobile communication,
FIG.4 (b) is the same half side sectional view, FIG.4 (c) is the same front view, FIG. 5 is the said
disassembled perspective view It is.
[0005]
According to the figure, reference numeral 1 denotes a circular diaphragm which generates air
vibration, and the outer peripheral portion of the diaphragm 1 is held by an adhesive with a
frame 2 provided with a plurality of first sound holes 2a on the outer periphery. ing.
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[0006]
One end of the voice coil 3 is fixed to the center of the diaphragm 1, and both ends of the voice
coil 3 are electrically connected to a terminal 4 provided below the periphery of the frame 2.
[0007]
The terminal unit 4 is also connected to an audio output terminal (not shown) of the audio
device.
[0008]
A magnetic circuit 8 composed of a magnet 5, a top plate 6, and a yoke 7 is integrally provided in
the central hole of the frame 2 by insert molding when the frame 2 is formed, and the vibration
in the gap of the magnetic circuit 8 is generated. The other end side of the voice coil 3 fixed to
the plate 1 is fitted.
[0009]
An audio signal output from the audio output terminal of the audio device is input to the voice
coil 3 through the terminal unit 4, the voice coil 3 is driven to vibrate the diaphragm 1, and a
sound wave is emitted. is there.
[0010]
In addition, 9 is a protector and plays a role for protecting the diaphragm 1.
[0011]
Further, the protector 9 is provided with a second sound hole 9 a which is line-symmetrical or
point-symmetrical with respect to a central portion viewed from the plane direction, and the
second sound hole 9 a is an acoustic wave emitted from the diaphragm 1. Radiate outwards.
[0012]
However, in the above-mentioned conventional loudspeaker, as the miniaturization of the
loudspeaker progresses, the ratio of the terminal portion 4 to the entire loudspeaker becomes
high, and accordingly the first sound hole 2a provided in the frame 2 becomes An imbalanced
arrangement (in which the first sound hole 2a is not provided in the terminal portion 4) can not
be obtained, whereby the flow of air into the speaker by the vibration of the diaphragm 1 at the
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time of driving the speaker is equalized. Therefore, it has a problem that it causes rolling and
causes an abnormal sound to be generated in the speaker.
[0013]
The present invention solves the above-mentioned problems, and provides a speaker with
excellent sound quality even if the speaker is compact and the arrangement of the sound holes in
the frame portion is unbalanced.
[0014]
According to the first aspect of the present invention, the second sound hole of the protector
mounted on the frame of the speaker is provided biased toward the terminal portion side of the
frame, It makes the air entering from the protector side uneven, balances the uneven air entering
from the frame side, corrects the vibration of the diaphragm to the up-and-down motion with
suppressed distortion, and causes an abnormal sound such as a rolling phenomenon. It is
intended to reduce the phenomenon.
[0015]
The invention according to claim 2 of the present invention is that the diameter dimensions of
the plurality of second sound holes provided in the protector are two or more different in
diameter, and by using sound holes of a plurality of diameters. More precise adjustment of the
inflow of air is possible, and the sound quality of the speaker is further improved.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will
be described with reference to FIGS.
[0017]
In the description, the same parts as in the prior art will be assigned the same reference
numerals and explanations thereof will be omitted.
[0018]
(First Embodiment) FIG. 1 (a) is a rear view of a speaker according to the present invention, FIG.
1 (b) is a half sectional view of the same, FIG. 1 (c) is a front view thereof, and FIG. Is the same
frequency sound pressure characteristic diagram, FIG. 2 (b) is the same distortion characteristic
diagram, and claim 1 will be mainly described.
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[0019]
Denoting only the differences in the prior art with reference to the figure, reference numeral 10
denotes a protector attached to the frame 2 by bonding, and 10 a denotes a plurality of second
sound holes provided in the protector 10 and provided below the frame 2. It is disposed so as to
be relatively biased to the lower side of the protector 10 so as to face the terminal portion 4 that
is being held.
[0020]
FIG. 2 (a) compares the frequency sound pressure characteristics of the speaker according to the
first embodiment with the conventional speaker, and FIG. 2 (b) shows the same distortion
characteristics. Although the speaker of the form 1 is shown as a, and the conventional one is
shown as b, as apparent from this characteristic graph, an extreme difference was not recognized
in the frequency sound pressure characteristics, but in the distortion characteristics, the present
embodiment It was confirmed that the speaker 1 was better.
[0021]
This is because the air enters the diaphragm 1 nonuniformly from the plurality of first sound
holes 2a in the portion excluding the terminal portion 4 from the frame 2 side and the protector
10 is biased toward the terminal portion 4 side of the protector 10 side. This is considered to be
due to the fact that air entering the diaphragm 1 unevenly from the provided second sound holes
10a is harmonized, and the generation of distortion of the diaphragm 1 is suppressed to vibrate.
[0022]
Second Embodiment The second embodiment of the present invention will be described mainly
with reference to FIG. 3 (a), (b) and (c).
[0023]
Fig.3 (a) is a rear view of the speaker of Embodiment 2 of this invention, FIG.3 (b) is the half
sectional side view, FIG.3 (c) is the front view.
11 is a protector, and the second sound hole 11a is biased to the terminal 4 side in the same
manner as the sound hole 10a of the first embodiment. While being provided, sound holes of
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three types of hole diameter are provided as the hole diameter of the second sound hole 11a.
[0024]
As described above, by using a plurality of the second sound holes 11a having different hole
diameters, the amount of air entering from the protector 11 side can be finely adjusted in a wellbalanced manner, and a higher sound quality of the speaker can be achieved. It is possible to
[0025]
In the above embodiment, the second sound holes 10a and 11a are all provided on the opposite
side of the terminal portion 4 below the center, but it is apparent from the above description that
the frame 2 is clear. Since the inflow of air at the portion facing the terminal portion 4 of the
protector 10 or 11 is made more in balance than the other portions so that the balance of the
inflow of the air from the side is uneven, each embodiment of the present invention If the amount
of air inflow is small, a sound hole may be provided on the upper side of the center, thereby
enabling fine balance adjustment.
[0026]
As described above, according to the speaker of the present invention, the position of the second
sound hole of the protector is adjusted so that the inflow of air flowing in through the protector
and the air entering unevenly from the frame side. By keeping the balance, distortion in the
diaphragm is suppressed, and it is possible to provide a speaker with an improved sound quality.
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