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JP2002142287

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Notice
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 JP2002142287
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm used in a portable terminal and a method of manufacturing the same.
[0002]
2. Description of the Related Art Generally, when a speaker emits sound pressure at a low
frequency (in the vicinity of 300 Hz), the vertical vibration of the arc-shaped cone formed at the
center of the speaker diaphragm becomes large and air flow is large. Become. For this reason, for
example, in the speaker 5 shown in FIG. 5, the air present in the space 501 sandwiched between
the cone portion 51 of the speaker diaphragm 50 and the pole piece 55 located below the cone
portion 51 flows smoothly. Is required. Therefore, it is ideal that the air in the space 501 is
discharged from the air vent 511 through the circulation path in the direction indicated by the
arrow 521 from the space 504.
[0003]
Further, another speaker 6 shown in FIG. 6 is provided with a vent hole 613 at the center of the
magnet 64 and the pole piece 65. In this case, the air in the space 601 is discharged from the
vent 613 through the flow path shown by the arrow 621.
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[0004]
However, in the speaker 5 shown in FIG. 5, since the space 504 formed by the connecting
portion 503 of the speaker diaphragm 50 and the voice coil 52 and the pole piece 55 is narrow,
this space The smooth flow of air in 504 is impeded. In order to smoothly distribute the air, it is
necessary to provide the speaker diaphragm 50 at the upper side to widen the space 504. In that
case, the height h5 of the entire speaker 5 inevitably becomes large.
[0005]
Further, in the speaker 6 shown in FIG. 6, since the vent hole 613 is provided at the central
portion between the magnet 64 and the pole piece 65, smooth flow of air can be improved, but
the magnet 64 has a donut shape. The magnetic force of 64 is reduced. Therefore, in order to
improve the quality of the speaker, it is necessary to increase the size and height of the magnet
64. In that case, the height h6 of the entire speaker 6 inevitably becomes large.
[0006]
As described above, in the prior art, it is difficult to reduce the size of the speaker, and it is also
difficult to reduce the thickness. Therefore, the main object of the present invention is to provide
a more compact and thin speaker diaphragm and a method of manufacturing the same, in which
air is smoothly circulated when the sound pressure in the low range is generated.
[0007]
According to the diaphragm for a loudspeaker as set forth in claim 1 of the present invention, it
is provided with a cone portion and an edge portion using a thin film member as a base material,
and an arc and an edge portion formed by the cone portion It is characterized in that the arcs to
be formed are convex in the opposite direction to each other. Therefore, thinning of the speaker
diaphragm is realized.
[0008]
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According to the speaker diaphragm of the second aspect of the present invention, the cone
portion and the edge portion are integrally molded as the same material. Therefore, it can
manufacture simply by integral molding.
[0009]
According to the speaker of claim 3 of the present invention, the speaker diaphragm of claims 1
and 2 is provided. Therefore, the quality of the speaker is improved, and downsizing and thinning
of the speaker are realized. According to the portable terminal of the fourth aspect of the present
invention, the loudspeaker of the third aspect is provided. Therefore, the quality of the portable
terminal is improved.
[0010]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the
present invention will be described below with reference to the drawings. An embodiment in
which the present invention is applied to a speaker diaphragm will be described based on FIGS. 1
to 3. First, a speaker provided with a speaker diaphragm according to an embodiment of the
present invention is shown in FIG. The speaker diaphragm 10 of the speaker 1 is integrally
molded using polycarbonate as a material. The speaker diaphragm 10 has a voice coil 12 at its
lower portion and is connected to the case 11. A container-like yoke 13 is connected to the inside
of the case 11, a magnet 14 is connected to the top of the yoke 13, and a pole piece 15 is
connected to the top of the magnet 14. The cone portion 101 of the speaker diaphragm 10 is
formed in a convex shape on the side of the pole piece 15, and the edge portion 102 is formed in
a convex shape on the opposite side of the pole piece 15.
[0011]
In the speaker 1, when sound pressure in the low range is generated, the cone portion 101
vibrates up and down greatly, and the air present in the space 104 sandwiched between the cone
portion 101 and the pole piece 15 flows in the direction indicated by the arrow 121. Through
the vent holes 111.
[0012]
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The cone portion 101 is formed in a convex shape on the side of the pole piece 15, and the top
portion 1011 and the pole piece 15 are formed so as not to be in contact with each other.
In that case, the space 105 formed by the connecting portion 103 between the speaker
diaphragm 10 and the voice coil 12 and the pole piece 15 inevitably becomes wide. For this
reason, air is transferred smoothly and discharged from the vent 111 to the outside of the
speaker. Therefore, the load resistance to the cone portion 101 due to the compression of the air
layer is eliminated, and the quality of the speaker is enhanced.
[0013]
In the above, FIG. 1 demonstrated the discharge ¦ emission of the air from the ventilation hole
111 of the left side of FIG. However, the discharge of air from the air vent 112 on the right side
of FIG. 1 is similarly performed in the flow path symmetrical to the flow path indicated by the
arrow 122.
[0014]
As shown in FIG. 2, in the speaker diaphragm 20 according to another embodiment of the
present invention, the cone portion 201 is convex downward in FIG. On the other hand, as shown
in FIG. 4, in the speaker diaphragm 40 according to the conventional example, the cone portion
401 is concave downward in FIG. When heights d2 and d4 of the speaker diaphragms 20 and 40
in FIG. 2 and FIG. 4 are compared, it is apparent that d2 is smaller and the speaker diaphragm 20
is realized to be thinner.
[0015]
FIG. 3 shows the frequency characteristics of a loudspeaker according to an embodiment of the
present invention. In the case of the loudspeaker according to one embodiment of the present
invention, a sound pressure of 60 dB or more is obtained for the low frequency range (near 300
Hz). On the other hand, in the case of the loudspeaker according to the conventional example,
only a sound pressure of about 35 dB is obtained. As a result, since the sound pressure in the low
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frequency band is significantly improved in this embodiment, the sound pressure can be
increased in a wide frequency range from the low frequency band to the high frequency band.
The speaker manufactured according to an embodiment of the present invention can be used for
a portable telephone, a PHS, an electronic organizer, and various other portable terminals.
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