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JP2010200251

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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 JP2010200251
The present invention provides a speaker device capable of maintaining a low frequency
reproduction band of a back chamber structure and preventing a reduction in sound pressure.
SOLUTION: In a speaker device 1 in which a speaker main body 5 having a magnetic circuit is
swingably accommodated in a speaker case 6 and a back chamber 25 is provided, a through hole
15A communicating with the back chamber 25 is formed on the back surface of a diaphragm 17.
It has the diffuser 15 which it has. [Selected figure] Figure 2
Speaker device
[0001]
The present invention relates to a speaker apparatus provided with a back chamber.
[0002]
Conventionally, a speaker device is known in which a speaker body having a magnetic circuit is
accommodated in a speaker case so as to be able to swing and a back chamber is provided (for
example, see Patent Document 1 and Patent Document 2).
In this type of speaker device, the volume of the back surface of the diaphragm is increased, so
that the effect of reducing the low frequency reproduction band is obtained.
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[0003]
JP-A-8-47072 JP-A-9-130889
[0004]
However, in the speaker device having the above-described configuration, although the
reproduction band in the low range is lowered, since the back pressure is not applied to the back
surface of the diaphragm, there is a problem that the sound pressure is lowered.
[0005]
Therefore, an object of the present invention is to solve the problems of the above-described
conventional techniques, maintain a low-frequency reproduction band of the back chamber
structure, and provide a speaker device capable of preventing a decrease in sound pressure. is
there.
[0006]
In order to achieve the above object, according to the present invention, a speaker body having a
magnetic circuit in a speaker case is pivotably accommodated, and in a speaker apparatus
provided with a back chamber, a through hole communicating with the back chamber on the
back of the diaphragm. And a diffuser having the
In the present invention, since the diffuser having the through hole communicating with the back
chamber on the back surface of the diaphragm is provided, the low-range regeneration zone of
the back chamber structure is maintained with a simple configuration and a small number of
parts, and the sound pressure is further reduced. You can prevent.
The diffuser may be made of resin, and a plurality of the through holes may be provided.
In this configuration, with a simple configuration, manufacture is easy, the low-range
regeneration zone of the back chamber structure can be maintained, and a decrease in sound
pressure can be prevented.
[0007]
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In the present invention, since the diffuser having the through hole communicating with the back
chamber on the back surface of the diaphragm is provided, the low-range regeneration zone of
the back chamber structure can be maintained with a simple configuration, and the sound
pressure drop can be prevented.
[0008]
It is a figure which shows the state when the tweeter which concerns on this Embodiment is
mounted in the both sides of the dashboard of a vehicle.
It is sectional drawing of the tweeter which concerns on this Embodiment. A is a top view of a
diffuser, B is a cross-sectional view. It is a graph which shows the relationship between a
frequency and sound pressure. It is sectional drawing of the tweeter which concerns on another
embodiment. A is a top view of a diffuser, B is a cross-sectional view.
[0009]
Hereinafter, an embodiment of the present invention will be described with reference to the
drawings. FIG. 1 is a view showing a state in which tweeters (speaker devices) 1 and 1 according
to the present embodiment are mounted on upper portions of both sides of a dashboard 3 of a
vehicle 2. The tweeters 1 and 1 are speakers for mainly outputting high-pitched sound. The
tweeters 1, 1 are connected to the on-vehicle audio device 4 via a cable 18 (see FIG. 2). The onvehicle audio device 4 reproduces a CD (compact disc) inserted according to the user's operation,
or receives a radio broadcast or the like, and transmits an audio signal to the tweeters 1 and 1. In
response to this signal, the tweeters 1, 1 output music and voice (hereinafter referred to as voice
and the like). Further, in addition to the tweeters 1 and 1, a speaker (not shown) for outputting a
low range or a mid range is connected to the on-vehicle audio device 4 through a cable. These
speakers and the tweeters 1 and 1 are integrated to output, to the inside of the vehicle 2, sound
and the like ranging from the low tone range to the high tone range.
[0010]
FIG. 2 is a cross-sectional view of the tweeter 1 according to the present embodiment. The
tweeter 1 according to this configuration includes a speaker body 5 and a speaker case 6 for
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housing the speaker body 5. The speaker body 5 is provided with a bottom yoke 7, and a bottom
yoke air vent hole 7 B is formed substantially at the center of the bottom 7 A of the bottom yoke
7. An annular main magnet 9 is disposed inside the bottom yoke 7, and a bottom yoke air vent
hole 7 B and an upper and lower portion in the figure (hereinafter, referred to as the front-rear
direction) are provided substantially at the center of the main magnet 9. A main magnet air vent
hole 9A is formed at a position corresponding to. Further, an annular top plate 11 is disposed so
as to overlap the main magnet 9, and a top plate air vent hole 11A is formed substantially at the
center of the top plate 11 at a position corresponding to the magnet air vent hole 9A. There is.
Further, an annular sub magnet 13 is disposed so as to overlap the top plate 11, and at an
approximate center of the sub magnet 13, a sub magnet air removal hole 13A is formed at a
position corresponding to the top plate air removal hole 11A in the front-rear direction. ing.
[0011]
Further, in the present configuration, the resin-made diffuser 15 is disposed so as to be
superimposed on the sub magnet 13, and in the diffuser 15, one through hole 15A is formed at a
position corresponding to the sub magnet air vent 13A. There is. That is, as shown in FIG. 3A, the
diffuser 15 has a substantially circular shape in top view, and one through hole 15A is formed in
a substantially central portion as shown in FIG. 3B.
[0012]
In this configuration, the main magnet 9 is attached in a manner to be sandwiched between the
bottom 7A of the bottom yoke 7 and the top plate 11 in the front-rear direction of the tweeter 1,
and the sub magnet 13 is the top plate 11 in the front-rear direction of the tweeter 1. And the
diffuser 15, and the bottom yoke 7, the main magnet 9, the top plate 11, the sub magnet 13, and
the diffuser 15 constitute a magnetic circuit.
[0013]
A magnetic gap 14 is formed between the outer peripheral surface of the top plate 11 and the
inner peripheral surface of the bottom yoke 7, and a voice coil 16 wound around a coil bobbin
(not shown) is loosely inserted in the magnetic gap 14 It is done.
A convex dome-shaped diaphragm 17 is connected to the front of the coil bobbin, and when a
voice signal is supplied to the voice coil 16 through the cable 18, the voice coil 16 receives an
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electromagnetic force in the magnetic gap 14 The diaphragm 17 vibrates to output sound and
the like. An annular speaker main body locking portion 19 is fixed to the outer peripheral portion
of the bottom yoke 7 so as to cover the front side portion of the bottom yoke 7. The outer
peripheral portion of the speaker body locking portion 19 has a curved shape in which the outer
diameter decreases as it goes from the rear to the front. A diffuser 20 for diffusing sound or the
like extends forward of the diaphragm 17 from the speaker body locking portion 19.
[0014]
A tweeter rotation receiver 21 is provided on the bottom 7A of the bottom yoke 7 so as to
protrude rearward from the rear end surface of the bottom yoke 7, and the tweeter rotation
receiver 21 is biased toward the bottom yoke 7 by a spring 22. There is. The tweeter rotation
receiver 21 has a substantially U-shaped cross section whose front is open, and a back chamber
23 is formed inside thereof. The back chamber 23 has a space on the back surface of the
diaphragm 17 through the bottom yoke air vent hole 7B, the main magnet air vent hole 9A, the
top plate air vent hole 11A, the sub magnet air vent hole 13A, and the through hole 15A of the
diffuser 15. I have contacted 24. The rear end 21A of the tweeter rotation receiver 21 abuts on
the fixing bracket 30, and the rear position of the tweeter rotation receiver 21 is determined.
[0015]
On the other hand, the speaker case 6 has a tubular body 26 whose front and rear are open, and
the front side of the body 26 has a curved shape in which the diameter of the inner periphery
becomes smaller toward the front. The portion 28 is formed. The outer peripheral surface of the
speaker body locking portion 19 is in contact with the speaker case locking portion 28. The
speaker main body 5 can slide (displace, swing) along the respective curved shapes, and can
change the direction in which sound or the like is emitted. On the inner peripheral surface on the
rear side of the body portion 26, a recessed portion 29 recessed toward the side is formed along
the entire circumferential direction. The fixing bracket 30 described above is fitted in the recess
29. In detail, a curved portion 31 bent in an arc shape toward the front of the tweeter 1 is
formed on the outer peripheral portion of the disk-like fixing bracket 30 over the entire
circumference in the circumferential direction, and the curved portion 31 is recessed It is fitted
and attached to the part 29.
[0016]
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In the tweeter 1, the space surrounded by the diaphragm 17, the coil bobbin (voice coil 16), the
top plate air vent hole 11A, the magnet air vent hole 9A, the bottom yoke air vent hole 7B and
the tweeter rotation receiver 21 is described above. A back chamber 25 is formed. Generally, as
the volume of the back chamber 25 is larger, the speaker can output sound and the like in a
wider sound range.
[0017]
The operation of the tweeter 1 will be described with reference to FIGS. 1 and 2. Here, in order to
simplify the description, the user who got on the vehicle 2 is reproducing the music recorded on
the CD inserted in the in-vehicle audio device 4 and, among the sounds etc. related to this music,
the high range The voices and the like are output from the tweeters 1 and 1, and the voice and
the like in the low to mid range are output from other speakers (not shown) mounted on the
vehicle 2. When the user feels a sense of discomfort in the direction of arrival of the high-pitched
voice etc. with strong directivity output from the tweeter 1 or 1 or the voice etc. is difficult to
hear, the diffusion of the speaker main body 5 is diffused. By grasping the body 20 with a finger
and moving the diffusion body 20, the speaker main body 5 is displaced within the speaker case
6, and the direction of arrival of voice etc. is adjusted until it becomes possible to hear an
optimum voice etc. Good. Also, for example, when the user feels that the volume of the voice or
the like is too high or the voice of the high-pitched range is weak, the user operates the operation
unit of the in-vehicle audio device 4 to adjust the volume of the voice or the like Adjust the
balance of the range.
[0018]
FIG. 4 shows the relationship between the reproduction frequency band of the tweeter 1 and the
sound pressure. In FIG. 4, the solid line indicates the presence of the diffuser 15, and the broken
line indicates the absence of the diffuser 15. The horizontal axis is frequency, and the vertical
axis is sound pressure. Generally, when the back chamber 25 is present, the overall sound
pressure is lower than in the case where the back chamber 25 is not present, but the sound
pressure is increased near about 600 Hz to 1.6 kHz (low frequency reproduction band). In the
present embodiment, as is apparent from FIG. 4, since the diffuser 15 having the through hole
15A communicating with the back chamber 25 is disposed on the back side of the diaphragm 17,
the low-frequency regeneration zone is from around 1.2 kHz. Reproduction was maintained, and
further, the sound pressure drop around 3.5 kHz to 8 kHz, which was conventionally low in
sound pressure, could be prevented. In addition, the rise was smooth, and the connection with
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Woofer also became good.
[0019]
According to the speaker device of the present embodiment, the back chamber structure is very
simple and only the diffuser 15 having the through holes 15A communicating with the back
chamber 25 is disposed on the back surface of the diaphragm 17, with a small number of parts.
The sound pressure drop can be prevented while maintaining the low frequency reproduction
band possessed by
[0020]
5 and 6 show another embodiment.
The same parts as those in FIG. 2 are denoted by the same reference numerals, and the
description thereof will be omitted. In this embodiment, a diffuser 115 made of resin is disposed
so as to overlap the sub magnet 13, and a plurality (four) through holes 115 A are provided in
the diffuser 115 at positions corresponding to the sub magnet air vent holes 13 A in the frontrear direction. Is formed. That is, as shown in FIG. 6A, the diffuser 115 has a substantially
circular shape in top view, and four through holes 115A are formed in a substantially central
portion as shown in FIG. 6B. Also according to the present embodiment, the back chamber
structure has a very simple structure with only a small number of parts, and only the diffuser
115 having a plurality of through holes 115A communicating with the back chamber 25 is
disposed on the back of the diaphragm 17. It is possible to prevent the sound pressure drop
while maintaining the area reproduction band.
[0021]
Although the best mode for carrying out the present invention has been described above, the
present invention is not limited to the above-described embodiment, and various modifications
and changes are possible based on the technical concept of the present invention. . For example,
the speaker device according to the present embodiment is applied not only to the tweeter 1,
which is a speaker exclusively for outputting high-pitched sound and the like, but also to all the
speakers having the same configuration for adjusting the direction of sound and the like It is
possible.
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[0022]
Reference Signs List 1 tweeter 5 speaker main body 6 speaker case 7 bottom yoke 9 main
magnet 11 top plate 13 sub magnet 15, 115 diffuser 15A, 115A through hole 17 diaphragm
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