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DESCRIPTION JP2003289595

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DESCRIPTION JP2003289595
[0001]
TECHNICAL FIELD The present invention relates to a speaker.
[0002]
2. Description of the Related Art Conventionally, small speakers are widely applied to small
portable terminals such as mobile phones, PDAs, pagers, small game machines and the like. Such
a speaker is required to be miniaturized and thinned similarly to other electronic components so
as to be suitable for high density mounting on the circuit board of the above-described small
portable terminal.
[0003]
A description will be given by taking up such a conventional small speaker. FIG. 4 is a plan view
of a conventional electrodynamic speaker, and FIG. 5 is a cross-sectional view showing a cross
section of FIG. First, the configuration of the electrodynamic speaker will be described with
reference to FIGS. 4 and 5. 50 is an electrodynamic speaker. An upper frame 51, a middle frame
52, and a lower frame 53, both of which are resin molded products, are welded to each other to
form a housing of the speaker 50. The upper frame 51 is provided with a plurality of sound
emission holes 51 a. The middle frame 52 is formed with a partition plate 52a which separates
the housing vertically, and a column 52b is erected at the center of the partition plate 52a, and a
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cylindrical projection 52c is formed on the periphery of the partition plate 52a. There is. The
partition plate 52a is provided with an air vent 52d penetrating vertically.
[0004]
At the peripheral portion of the lower frame 53, hook portions 53a extending downward at three
locations at equal intervals are formed. Reference numeral 54 denotes a disc-shaped yoke made
of a magnetic material and embedded in the protrusion 52c of the middle frame 52, and a
support 52b rises from the central hole of the yoke 54. 55 is a disk-shaped permanent magnet
fixed at the center of the bottom of the yoke 54 and having magnetic poles at the top and bottom
and having a central hole, and 56 is a disk-shaped top plate fixed to the magnetic pole surface of
the magnet 55 and having a central hole is there. The magnetic circuit portion is constituted by
the yoke 54, the magnet 55 and the top plate 56 which are crimped by the head of the column
52b, and the magnet 55 passes through the magnetic gap between the upper end of the yoke 54
and the peripheral portion of the top plate 56 A circuit is formed.
[0005]
Reference numeral 57 denotes a substantially spherical diaphragm integrally formed of a plastic
material, and its cross section has a curved shape constricted by a flat portion 57a closer to the
peripheral portion. The peripheral portion forms a flat surface and is adhesively fixed to the
outer peripheral portion of the middle frame 52. 58 is a voice coil which is an annular air-core
coil formed by aligning and winding a coil winding which is an enamel coated copper wire in a
rectangular cross section, and its upper surface is adhered to the lower surface of the flat portion
57a of the diaphragm 57 It is fixed. The voice coil 58 is inserted into the magnetic gap between
the peripheral portion of the top plate 56 and the upper end of the yoke 54 to a depth
approximately half the coil length.
[0006]
Reference numeral 59 denotes a contact pin which is a connection terminal embedded in the
bulging portion of the middle frame 52, which is connected to a winding terminal (not shown) of
the voice coil 58 and protrudes below the lower frame 53. When mounting the speaker 50 on
the circuit board 70 of the electronic device, as shown in FIG. 6, the hook portion 53a and the
contact pin 59 are engaged with the respective holes provided on the circuit board 60, thereby
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The pins 59 are soldered to the circuit pattern on the lower surface of the circuit board 70.
Reference numeral 61 denotes a front air chamber defined by the diaphragm 57 and the upper
frame 51, and reference numeral 62 denotes a rear air chamber defined by the diaphragm 57,
the middle frame, and the lower frame.
[0007]
Next, the operation of the speaker 50 will be described. When an electrical signal is input from
the contact pin 59, a current flows through the voice coil 58, and the diaphragm 57 vibrates to
generate sound by the action of the left side of the framing with the magnetic gap. This sound
passes from the front air chamber 61 divided by the upper frame 51 and the diaphragm 57 to
the outside air through the sound emission hole 51a.
[0008]
However, in the conventional speaker 50, there is no air passage in the rear air chamber 62 and
the air is completely sealed, so that the load resistance of the diaphragm 57 is reduced to some
extent. It is necessary to provide a large space in the back air chamber 62, which is to increase
the thickness of the product. It is difficult to set the resonance frequency to a low frequency from
such a thing. In addition, since the back air chamber 62 is a sealed space, there is a concern such
as heat generation. Furthermore, since the contact pin 59 is attached to the middle frame 52,
there is a risk that the upper frame 51 or the middle frame 52 may be separated from the lower
frame 53 due to an impact such as falling.
[0009]
The present invention has been made to solve the above-described conventional problems, and
its object is to provide a speaker that reduces the load resistance of the diaphragm and is
resistant to heat and impact.
[0010]
SUMMARY OF THE INVENTION The means of the present invention for achieving the above
object are a diaphragm to which a voice coil is fixed, a yoke, a magnet fixed to the yoke, and a top
plate fixed to the magnet. A speaker in which the upper frame and the lower frame are joined
together, and the diaphragm and the magnetic circuit are fixed to the upper frame; The rear air
chamber partitioned by the diaphragm is provided with an air vent communicating with the
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outside air, and the front air chamber partitioned by the lower frame and the diaphragm is
provided with a sound emission aperture communicating with the outside air It is characterized
by
[0011]
Further, the upper frame is provided with a plurality of hooks projecting from the lower surface
of the lower frame along the side surface of the lower frame.
[0012]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A loudspeaker according to an
embodiment of the present invention will be described in detail below based on the drawings.
FIG. 1 is a plan view of a speaker according to an embodiment of the present invention, FIG. 2 is
a sectional view of the speaker, and FIG. 3 is a sectional view showing the speaker mounted on a
circuit board of an electronic device. .
[0013]
First, the configuration of the speaker according to the embodiment of the present invention will
be described.
In FIG. 1 and FIG. 2, reference numeral 10 denotes an electrodynamic speaker, and a housing of
the speaker 10 includes an upper frame 1 and a lower frame 2 which are resin molded articles.
The upper frame 1 is formed with a sound emission hole 1d penetrating upward and a plurality
of air holes 1a, and a pillar 1c is formed at the center, and a cylindrical projection for holding the
magnetic circuit portion surrounding the pillar 1c. The portion 1 b is integrally formed. Further,
from the outer periphery of the upper frame 1, three hook portions 1e are formed at equal
intervals along the guide groove (not shown) provided on the side wall of the lower frame 2 and
projecting downward of the lower frame 2.
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[0014]
3 is a yoke embedded in the protrusion 1b, 4 is a magnet, and 5 is a top plate. The yoke 3, the
magnet 4, and the top plate 5 are each formed with a central hole through which the support 1 c
is inserted, and the head of the support 1 c is crimped. 6 is a diaphragm and 7 is a voice coil
fixed to the diaphragm. Reference numeral 8 denotes a head contact pin as a connection
terminal, which is press-fit from the upper frame 1 through the lower frame 2, and the tip
projects from the lower frame 2. Reference numeral 11 denotes a front air chamber which is an
air chamber partitioned by the lower frame 2 and the diaphragm 6, and 12 denotes a rear air
chamber which is an air chamber partitioned by the upper frame 1 and the diaphragm 6.
[0015]
When mounting the speaker 10 on the circuit board of the electronic device, as shown in FIG. 3,
the hook portion 1e is engaged with the positioning hole of the circuit board 20, and the contact
pin 8 is also the hole of the circuit board It penetrates and joins with a circuit pattern by
soldering etc.
[0016]
Next, the operation and effect of the present embodiment will be described.
The air in the front air chamber 11 leads to the upper side of the speaker 10 through the sound
emission hole 1 d near the contact pin 8. Since the air in the rear air chamber 12 escapes from
the plurality of air holes 1a to the top surface of the speaker 10, the problem of heat generation
is eliminated. Therefore, the load resistance of the diaphragm 6 can be greatly reduced within a
limited space, and the sound pressure is increased. Therefore, the resonance frequency exists in
the low band, and the regeneration use band can be increased as compared with the conventional
one. In the conventional design, the housing was divided into three parts, but the division into
two parts was sufficient, and the number of parts and the number of man-hours were reduced,
and the cost could be reduced compared to the conventional case. Further, by making the hook
portion 1e project from the upper frame 1 and providing a guide groove for positioning on the
lower frame 2, positioning of the upper and lower frames becomes easy, and separation of the
upper and lower frames can be prevented.
[0017]
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As described above, the housing of the speaker is formed by joining the upper frame and the
lower frame, the diaphragm and the magnetic circuit are fixed to the upper frame, and the upper
frame and the diaphragm are divided. The rear air chamber is provided with an air vent
communicating with the outside air, and the front air chamber divided by the lower frame and
the diaphragm is provided with a sound emission hole communicating with the outside air, so the
load resistance of the diaphragm is reduced. The amplitude was induced, the sound pressure was
improved, the resonance frequency shifted to the lower frequency, and the product regeneration
use band was improved.
[0018]
In addition, since the upper frame is provided with a plurality of hooks projecting from the lower
surface of the lower frame along the side of the lower frame, the hooks engage the lower frame
and engage with the circuit board, so they receive an impact. There is no problem that the upper
and lower frames peel off.
Thus, a reliable speaker with stable quality was obtained.
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