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JP2008099106

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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 JP2008099106
The present invention relates to a frame used for a speaker, and aims to prevent damage to the
speaker. According to the present invention, a magnetic circuit body 11 and a voice coil 16
movably disposed relative to a magnetic gap 15 formed by the magnetic circuit body 11 are
provided. A diaphragm 19 whose end is connected to the voice coil 16, and a metal frame 20
whose outer periphery is connected to the outer periphery of the diaphragm 19 and which
supports the magnetic circuit body 11 at its inner periphery; The outer periphery of the metal
frame 20 is provided with a resin frame 21 integrally formed by insert molding, and the resin
frame 21 is configured such that a notch is provided in a part of a joint portion with the metal
frame 20, As a result, it is possible to suppress cracking of the resin frame 21 provided for
forming into any appropriate shape according to the installation place. [Selected figure] Figure 1
スピーカ
[0001]
The present invention relates to a loudspeaker.
[0002]
Hereinafter, the conventional invention will be described with reference to FIG.
[0003]
As shown in FIG. 4, the conventional speaker 1 includes the magnetic circuit body 5 configured
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by holding the cylindrical magnet 2 between the lower plate 3 having the center pole and the
cylindrical upper plate 4.
The magnetic circuit body 5, the voice coil 7 movably disposed with respect to the magnetic gap
6 formed by the magnetic circuit body 5, and the diaphragm 8 whose inner peripheral end is
connected to the voice coil 7 A metal frame 9 having an outer peripheral portion connected to
the outer peripheral end of the diaphragm 8 via an edge 8A and supporting the magnetic circuit
body 5 at an inner peripheral portion; and insert molding on the outer peripheral portion of the
metal frame 9 The speaker 1 is configured with the resin frame 10 integrally formed in the
above.
[0004]
This conventional speaker 1 is provided with a resin frame 10 inferior in strength to the metal
frame 9 but excellent in formability at the outer peripheral end of the metal frame 9 having
sufficient strength to support the heavy magnetic circuit body 5 sufficiently. Structure.
That is, by molding the resin frame 10 into any appropriate shape depending on the installation
place, the speaker 1 can be attached to various places.
[0005]
In addition, as a prior art document regarding the invention of this application, patent document
1 is known, for example. Unexamined-Japanese-Patent No. 2002-152883
[0006]
In the conventional speaker 1 described above, when an audio signal is applied to the voice coil
7, a driving force is generated in the voice coil 7 by the action of the magnetic force of the
magnet 2, and the diaphragm 8 connected to the voice coil 7 by this driving force. Is a
mechanism that vibrates to generate a sound. However, when an audio signal is applied to the
voice coil 7, Joule heat is generated in the voice coil 7 together with the driving force, and this
heat is transmitted to the metal frame 9 and to the metal frame 9 through the magnetic circuit
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body 5. The heat is conducted to the resin frame 10 provided on the outer peripheral portion of
the metal frame 9. Here, since the resin frame 10 provided for the purpose of attaching the
speaker 1 has a thermal expansion coefficient different from that of the metal frame 9, there is a
difference in thermal expansion between the metal frame 9 and the resin frame 10 as the
temperature changes. It occurs. Due to this thermal expansion difference, thermal stress is
generated in the resin frame 10, and as a result, the resin frame 10 may be cracked and the
speaker 1 may be damaged.
[0007]
Then, an object of this invention is to provide the flame | frame for speakers which prevents
damage to a speaker.
[0008]
And in order to achieve this object, according to the present invention, a notch is provided in a
part of a joint portion between the resin frame and the metal frame.
[0009]
According to the above configuration, the thermal stress generated due to the thermal expansion
difference between the metal frame and the resin frame is absorbed by the notch provided in the
joint portion of the metal frame and the resin frame.
As a result, the occurrence of cracks in the resin frame can be suppressed, and damage to the
speaker can be prevented.
[0010]
Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described with
reference to FIG.
FIG. 1 is a cross-sectional view showing a speaker of the present invention. The upward direction
is the direction of A in FIG.
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[0011]
As shown in FIG. 1, the magnetic circuit body 11 is configured by holding a cylindrical magnet
14 from above and below by a cylindrical upper plate 12 and a lower plate 13 having a center
pole. The magnetic circuit body 11 forms a cylindrical magnetic gap 15 from the outer
peripheral side surface of the center pole of the lower plate 13 to the inner peripheral side
surface of the upper plate 12.
[0012]
In the magnetic gap 15, a cylindrical voice coil 16 is disposed with a gap between the upper plate
12 and the center pole of the lower plate 13. The voice coil 16 is disposed movably in the
vertical direction with respect to the magnetic gap 15, and a dust cap 17 for preventing the entry
of dust is provided above the voice coil 16. The outer peripheral side surface of the voice coil 16
is connected to the inner peripheral end of the damper 18, and the damper 18 supports the voice
coil 16 so as to be able to move up and down.
[0013]
Further, the inner peripheral end of the diaphragm 19 is connected to the outer peripheral side
surface of the voice coil 16 above the damper 18 connecting portion, and the diaphragm 19
vibrates due to the movement of the voice coil 16 in the vertical direction. ing.
[0014]
The configurations of the metal frame 20 and the resin frame 21 according to the first
embodiment of the present invention will be described with reference to FIGS. 1, 2A, 2B, and 3.
FIG.
2 (A) is a perspective view of the metal frame 20 and the resin frame 21 of the present invention,
FIG. 2 (B) is an enlarged view of the notch 22 of the present invention, and FIG. 21 is an enlarged
plan view of a joint portion with 21. FIG.
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[0015]
As shown in FIG. 1, the opening edge of the metal frame 20 is connected to the outer peripheral
end of the diaphragm 19 through the edge 19A, and the inner peripheral is connected to the
upper surface of the upper plate 12 constituting the magnetic circuit body 11. It is done. The
resin frame 21 generally formed in a ring shape is integrally formed with the metal frame 20 by
insert molding, and as shown in FIGS. 1 and 2A, the inner peripheral portion of the resin frame
21 is the outer peripheral portion of the metal frame 20. It is connected to the. The resin frame
21 is provided for the purpose of attaching the speaker 1 to various places, and is a resin
material which is excellent in formability as compared with a metal material in order to enable
molding into any appropriate shape according to the attaching place. It is composed of As shown
in FIGS. 2A, 2B, 3A and 3B, the resin frame 21 is provided with a notch 22 in which the left and
right ends of the lower end are substantially arc-shaped, and the notch 22 At 22, the upper
surface portion, the lower surface portion, and the outer peripheral end side surface of the metal
frame 20 are exposed portions not covered by the resin frame 21. Furthermore, in the metal
frame 20, a hole 23 is provided in a portion covered by the resin frame 21. This hole 23 is a
resin frame when the metal frame 20 and the resin frame 21 are integrally formed by insert
molding. It is filled with the resin material which comprises 21.
[0016]
Next, the operation of the speaker according to the first embodiment of the present invention will
be described with reference to FIG. 1, FIG. 2, and FIG.
[0017]
When an audio signal is applied to the voice coil 16 shown in FIG. 1, it reacts with the magnetic
flux of the magnetic gap 15 formed by the magnetic circuit body 11, and a driving force is
generated in the voice coil 16 by the principle of electromagnetic action.
At this time, the driving direction changes in the vertical direction according to Fleming's left
hand rule. Due to the fluctuation of the voice coil 16, the diaphragm 19 connected to the voice
coil 16 vibrates, and by moving air, sound is emitted from the speaker.
[0018]
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When a voice signal is applied to the voice coil 16 as described above, heat is generated, and the
heat is transmitted from the magnetic circuit body 11 to the metal frame 20 and the resin frame
21. At this time, the resin frame 21 made of a resin material has a thermal conductivity different
from that of the metal frame 20 made of a metal material, so that thermal stress is generated
with the temperature change of the resin frame 21. As a result, cracking occurs Can cause
damage to the speaker.
[0019]
Therefore, in the first embodiment of the present invention, as shown in FIG. 2 and FIG. 3, the
resin frame 21 integrally formed by insert molding is provided with a notch 22 at the junction
with the metal frame 20. According to this configuration, the notch 22 can absorb the thermal
stress generated in the resin frame 21 due to the thermal expansion difference with the metal
frame 20. Thereby, the resin frame 21 is not cracked, and as a result, the speaker can be
prevented from being damaged. Also, a plurality of cutouts 22 may be provided. By providing a
plurality of cutouts 22, the effect of absorbing thermal stress is enhanced.
[0020]
Further, it is desirable that both left and right ends of the lower end portion of the notch 22
provided in the resin frame 21 be substantially arc-shaped. By making the left and right ends of
the lower end of the notch 22 substantially arc-shaped as described above, thermal stress acting
in the tangential direction of the substantially ring-shaped resin frame 21 is dispersed, and a
crack is generated from the notch 22. Can be prevented. What is important here is that the
notched portion 22 does not have a corner at which thermal stress is concentrated and becomes
a starting point of a crack, that is, the left and right ends of the lower end portion of the notched
portion 22 are substantially arc-shaped. Instead, the shape of the notch 22 may be a substantially
semi-elliptic shape or the like.
[0021]
Further, since the resin frame 21 receives thermal stress from a portion in contact with the outer
peripheral portion of the metal frame 20, the upper surface and the lower surface of the metal
frame 20 in the notch 22 in order to absorb the thermal stress generated in the resin frame 21. It
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is more effective to set the exposure configuration in which the outer peripheral end side surface
is not covered with the resin frame 21. That is, in this configuration, the lower end of the notch
22 is located below the outer peripheral end of the metal frame 20.
[0022]
In the first embodiment of the present invention, since the resin frame 21 is provided with the
notch 22, the bonding area between the metal frame 20 and the resin frame 21 is reduced, and
as a result, the bonding strength between the metal frame 20 and the resin frame 21 Is
considered to be weak. Therefore, in order to secure the bonding strength between the resin
frame 21 and the metal frame 20, the hole 23 may be provided at a portion where the metal
frame 20 is covered by the resin frame 21 as shown in FIG. Thus, by performing insert molding
in a state where the holes 23 are provided in the metal frame 20, the resin material constituting
the resin frame 21 is filled in the holes 23 provided in the metal frame 20, and the holes 23 are
provided. This is because the continuity between the metal frame 20 and the resin frame 21 is
increased and the bonding strength is secured as compared with the case without the joint.
[0023]
Although the first embodiment of the present invention shows the speaker having the external
magnetic type magnetic circuit body 11, the present invention is not limited to this, and the
present invention is applied to a speaker having the internal magnetic type magnetic circuit
body. good.
[0024]
Further, since the door portion of the car receives strong impact when opening and closing or
traveling, the in-vehicle speaker attached to the door portion may fall off if the joint strength with
the mounting portion is weak.
Furthermore, in-vehicle speakers are often exposed to high temperatures, such as mounting on a
front door and mounting a rear panel. Therefore, the present invention can maintain the bonding
strength with the mounting portion of the speaker by suppressing the occurrence of cracks due
to the thermal expansion difference between the metal frame 20 and the resin frame 21 and can
prevent the speaker from falling off from the mounting portion. It can be suitably adopted as an
on-vehicle speaker.
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[0025]
Also in the field of audio systems, speakers tend to be smaller and lighter, and have a larger
input. Originally, in the case of a large input, it is necessary to make the diameter of the voice coil
16 large in proportion to that, but in actual situations, it can not be larger than the price issue.
When a large input is made to the speaker having such a configuration, the voice coil 16
generates Joule heat in proportion to that, and the difference in thermal expansion between the
metal frame 20 and the resin frame 21 appears notably. At this time, according to the present
invention, it is possible to suppress the occurrence of thermal stress and prevent the speaker
from being damaged. Therefore, the present invention can be suitably adopted in an audio
system.
[0026]
INDUSTRIAL APPLICABILITY The present invention can prevent the damage of the speaker by
absorbing the thermal stress of the frame in the speaker, and the damage of the speaker can be
prevented, and the present invention is particularly useful for a speaker for vehicle or audio
system.
[0027]
Sectional drawing (A) of the speaker in Embodiment 1 of this invention is a perspective view of
the metal frame and the resin frame part in Embodiment 1 of this invention, (B) is a cutting of the
speaker frame in Embodiment 1 of this invention Enlarged perspective view of the chipped part
Enlarged plan view of the joint between the metal frame 20 and the resin frame 21 according to
the first embodiment of the present invention Cross-sectional view of a conventional speaker
Explanation of sign
[0028]
11 Magnetic Circuit Body 12 Upper Plate 13 Lower Plate 14 Magnet 15 Magnetic Gap 16 Voice
Coil 17 Dust Cap 18 Damper 19 Diaphragm 19A Edge 20 Metal Frame 21 Resin Frame 22
Notched Part 23 Hole
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