JP2008092038

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DESCRIPTION JP2008092038
The present invention relates to a method for assembling a thin type speaker. In order to achieve
this object, in the speaker assembling method of the present invention, a diaphragm in which a
voice coil is assembled after the yoke having the first rod-shaped magnet assembled is assembled
to the lower case. After assembling the yoke 13 to the lower case 5 assembled, then the upper
case 6 assembled the second rod magnet 15 and the yoke 16 to the lower case 5 assembled the
yoke 10 and the diaphragm 13 I tried to combine. [Selected figure] Figure 5
Speaker assembly method
[0001]
The present invention relates to a method for assembling a thin type speaker.
[0002]
Since a reduction in thickness is required for electronic devices such as portable devices, a
reduction in thickness for speakers incorporated in the main body is also required.
[0003]
In order to make the speaker thinner, it is natural to miniaturize the magnet for forming the
magnetic circuit. However, if the magnet is made smaller, the magnetic force becomes smaller,
and as a result, the sound output is also reduced. In fact, the magnet can not be made so small
(for example, such a prior art is described in Patent Document 1 below) because it becomes
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smaller.
JP, 2005-51283, A
[0004]
As described above, conventionally, the type of speaker built into electronic devices such as
portable devices has been made thinner, but the magnet can not actually be made much smaller
in order to avoid the reduction in audio output. However, as a result, there has been the problem
that a sufficiently satisfactory thinning has not been achieved.
[0005]
Therefore, it is an object of the present invention to make it possible to reduce the thickness and
to enhance the audio output.
[0006]
And in order to achieve this object, according to the present invention, a first rod-like magnet and
a magnetic gap which is disposed parallel to the first rod-like magnet and formed between the
first rod-like magnet and the first rod-like magnet are provided. Support by magnetically
coupling a second rod-like magnet arranged in a horizontal direction or a substantially horizontal
direction, one pole face of the first rod-like magnet and one pole face of the second rod-like
magnet Yokes, upper and lower cases made of nonmagnetic material for accommodating the first
and second bar magnets and the yoke so as to form a space at both ends in the longitudinal
direction of the first and second bar magnets, and The diaphragm is disposed in the space in the
upper surface direction of the first bar-shaped magnet and the space in the lower surface
direction of the second bar-shaped magnet, and the outer periphery thereof is supported and
fixed to the diaphragm which can vibrate in the vertical direction; A voice coil disposed in the
magnetic gap; A speaker assembling method comprising: sound emission holes formed at both
ends of a front surface of a case and communicating with spaces formed at both end portions of
the first and second rod-like magnets in the upper and lower cases, After the yoke having the
first rod-shaped magnet assembled is assembled to the lower case, the diaphragm having the
voice coil assembled is assembled to the lower case, and then the second rod-shaped magnet and
the yoke are assembled. The attached upper case is combined with the lower case.
[0007]
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As described above, according to the present invention, there is provided a diaphragm in which
the first and second rod-like magnets are disposed in the horizontal direction or substantially the
horizontal direction of the magnetic gap via the magnetic gap, and the voice coil disposed in the
magnetic gap is fixed. Can be disposed in the space in the upper surface direction of the first barshaped magnet and the space in the lower surface direction of the second bar-shaped magnet, so
that thinning can be achieved.
Further, sound emission holes are formed at both ends of the front surface of the upper and
lower cases made of nonmagnetic material for accommodating the first and second rod magnets
so as to form spaces at both ends of the first and second rod magnets. Since the sound release
holes are communicated with the spaces at both ends of the first and second rod-like magnets,
the space in the lower surface direction of the second rod-like magnet in which the diaphragm is
disposed is formed as a relatively large capacity. It is possible to increase the sound output.
Moreover, after the yoke on which the first rod-shaped magnet is assembled is assembled to the
lower case, the diaphragm on which the voice coil is assembled is assembled to the lower case,
and then the second rod-shaped magnet and the yoke are assembled. In order to assemble the
upper case to the lower case, the lower case having the movable diaphragm can be placed on the
assembly table for assembly, and the assembly workability can be improved.
[0008]
Hereinafter, an embodiment of the present invention will be described by taking a mobile phone
as an electronic device as an example and using the accompanying drawings.
[0009]
In FIG. 1, reference numeral 1 denotes a main body, and a lid 2 is openably connected to the
main body 1.
When viewed from the back side in FIG. 1, the main body 1 is provided with operation buttons
(not shown) as in a general mobile phone, and the lid 2 is provided with a liquid crystal display
(not shown) There is.
A speaker 3 is built in on the back side of the main body 1, and a sound output hole provided in
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the case of the speaker 4 is in communication with the sound output hole 4 provided on the
outer side surface of the main body 1.
[0010]
As shown in FIG. 2, the speaker 3 has sound release holes 7 at both ends of the lower case 5
made of upper and lower two nonmagnetic materials and the front surface of the upper case 6
and vibration spaces in the upper and lower cases 5, 6 It is in communication with
The speaker 3 is provided with a terminal plate near the back side of the upper surface of the
upper case 6, and a junction 8a to which the start and end of the voice coil are soldered is input
to this terminal plate and a signal from an external amplifier is input. The terminal portion 8b is
formed.
[0011]
As shown in FIG. 3, FIG. 4 and FIG. 5, the first rod-like magnet 11 is joined to the center of the Ushaped yoke 10 so as to be parallel to the shoulder 10a of the yoke 10. A lower plate 12 made of
a magnetic material is joined to the upper surface of the first rod-like magnet 11. Thus, the yoke
10 to which the first rod-shaped magnet 11 and the lower plate 12 are assembled is
accommodated in the central portion of the bottomed rectangular lower case 5, and the lower
surface of the yoke 10 and the first rod-shaped magnet A vibrating space is secured at both ends
in the longitudinal direction of 11.
[0012]
Here, the yoke 10 is joined in the groove 5a provided in the lower case 5, the upper surface of
the shoulder 10a is made the same plane as the upper surface of the step 5b provided in the case
5, and vibration described later It is intended to be used as a joint between plates.
[0013]
Further, in the speaker 3, the oval-shaped voice coil 14 is joined to the diaphragm 13, and the
support portion 13 a on the outer periphery thereof is bonded to the joint on the lower case 5
side by an adhesive.
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[0014]
A second rod-shaped magnet 15 is disposed in front of and behind the first rod-shaped magnet
11 so as to be parallel to the first rod-shaped magnet 11, and a predetermined magnetic gap with
the first rod-shaped magnet 11 is provided. Form.
Here, as shown in FIG. 3, the second rod-like magnet 15 is disposed obliquely above the first rodlike magnet 11.
[0015]
The upper case 6 combined with the lower case 5 has a U-shaped frame-shaped case main body
6a obtained by insert-molding the terminal plate, a nonmagnetic upper cover 6b for closing the
upper window of the case main body 6a, and the case main body A front lid 6c is provided to
close the center of the front window 6a. The front lid 6c has a window for forming the sound
release holes 7 at both ends of the front lid 6c.
Two plate-like yokes 16 are joined to the inside of the upper case 6 in parallel with the first and
second rod-like magnets 11 and 15, and the inner surface of the yoke 16 is a second rod-like
magnet. 15 are respectively joined.
[0016]
In the speaker 3, after the yoke 10 having the first rod-like magnet 11 and the lower plate 12
assembled is assembled to the lower case 5, the diaphragm 13 having the voice coil 14
assembled is assembled to the lower case 5 side. The upper case 6 assembled with the second
rod-like magnet 15 and the yoke 16 is assembled to the lower case 5.
[0017]
By this assembly, the vibrating plate 13 is disposed in the space in the upper surface direction of
the first bar-shaped magnet 11 and is disposed in the space in the lower surface direction of the
second bar-shaped magnet 15.
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Then, both end portions in the longitudinal direction of the diaphragm 13 are disposed in a
relatively large vibration space in which the first and second bar magnets 11 and 15 do not exist.
[0018]
On the other hand, the longitudinal direction upper surface of the yoke 16 on the upper case 6
side is closely opposed to the shoulder portion 10a of the yoke 10 via the support portion 13a of
the diaphragm 13, and the first and second rod-like magnets 11, 15 are opposed. Are
magnetically coupled.
[0019]
By configuring the speakers in the rectangular upper and lower cases 5 and 6 in this manner, the
space factor is improved, and the configuration is advantageous for improving the sound
pressure level by reducing the size and thickness.
[0020]
That is, as described above, by having two or more rod-like magnets, the energy of the magnetic
circuit is improved, and by arranging these rod-like magnets obliquely upward to form a
magnetic gap, thinning and downsizing can be achieved. It has been realized.
[0021]
Further, by making the external shape into a rectangular shape, the space factor is improved, and
by using a magnetic circuit component such as a bar magnet, a plate, or a yoke, the effective
utilization and efficiency of the space of the magnetic circuit are improved.
[0022]
In the speaker configured as described above, the first rod-like magnet 11 is magnetized in the
thickness direction as shown in FIG. 6, and the surface side in the thickness direction is
magnetized as the S pole and the lower surface side in the thickness direction is magnetized as
the N pole. ing.
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On the other hand, the second rod-like magnet 15 is magnetized in the short width direction, and
the inner side surface in the longitudinal direction is magnetized as the N pole, and the outer side
surface in the longitudinal direction is magnetized as the S pole.
[0023]
As a result, as shown in FIG. 6, the magnetic fluxes emitted from the respective N poles of the
first bar-shaped magnets 11 (in FIG. 6, only the magnetic fluxes emitted from one of the barshaped magnets 15 are shown to avoid complexity). ) Travels approximately horizontally inward
and traverses the voice coil 14 in a substantially orthogonal state, and then enters the S pole of
the upper surface of the bar magnet 11 (note that the bar magnets 15 and 11 are horizontal, or
Although it is described that they are arranged in a substantially horizontal state, in the
substantially horizontal state, as shown in FIG. 3, the thickness direction of the bar-shaped
magnets 15 and 11 partially overlaps in the horizontal direction, and It does not overlap partially
in the horizontal direction but includes the approached state.
That is, it is important to advance the magnetic flux so as to be substantially orthogonal to the
voice coil 14. In that point, a slight width is set in the horizontal state. ).
[0024]
Thereafter, the magnetic flux from the N pole of the lower surface of the rod-like magnet 11
travels through the yoke 10 and the shoulder 10a of the yoke 10, passes through the yoke 16
magnetically coupled to the shoulder 10a of the yoke 10, and the outer periphery of the rod-like
magnet 15 It will enter the south pole.
[0025]
The flow of the above magnetic flux directly becomes a magnetic circuit, and in this magnetic
circuit, a magnetic gap is formed between the inner N pole of the bar-shaped magnet 15 and the
upper surface S pole of the bar-shaped magnet 11. Thus, the vibration is transmitted to the
diaphragm 13 to which the voice coil 14 is fixed, and an audio output is produced.
[0026]
In the speaker according to the present invention, both ends in the longitudinal direction of the
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rod-like magnet are made to be a vibration space, and both ends of the front surface in the
longitudinal direction of the upper and lower cases are made to communicate with the vibration
space as sound output holes. Side port can be configured.
As a result, the present invention is applicable to mobile devices such as mobile phones.
[0027]
The perspective view of the mobile phone which applied the speaker of one embodiment of the
present invention The perspective view of the speaker The cross section which cut the speaker
by the transverse direction The cross section which cut the speaker by the longitudinal direction
The sectional view which cut the speaker by the longitudinal direction Main part enlarged
sectional view of
Explanation of sign
[0028]
5 lower case 6 upper case 7 sound output hole 10 yoke 11 first bar magnet 13 diaphragm 14
voice coil 15 second bar magnet 16 yoke
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