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DESCRIPTION JP2000013888

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DESCRIPTION JP2000013888
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
small and light speaker device and a speaker used therefor.
[0002]
2. Description of the Related Art As an effective means for extending the low-frequency
reproduction limit of a generally small and light speaker device, an opening and a duct are
provided in a baffle plate provided with a speaker and the light is emitted from the back of the
diaphragm of the speaker. A bass reflex type (phase inversion type) speaker in which the phase
of sound is inverted and radiated from the opening through the duct to intensify the sound wave
emitted from the diaphragm of the speaker to the front so as not to distort the bass region. The
device is well known.
[0003]
In such a phase-reversal type speaker device, as shown in FIG. 2, the speaker 3 is fixed so as to
face the speaker sound emission hole 2a formed in the baffle plate 2 provided on the front of the
speaker box 1.
[0004]
For example, as shown in FIG. 2, the speaker 3 is provided with a ring-shaped magnet 4 and a
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plate 5 and a yoke 6 attached so as to sandwich the ring-shaped magnet 4. A magnetic air gap 7
is formed between the six center poles 6a.
Further, a frame 8 of the speaker 3 is attached to the plate 5, an edge 9 is provided on the outer
peripheral portion of the diaphragm 10, and the outer peripheral portion of the cone-shaped
diaphragm 10 is held by the frame 8 by the edge 9.
[0005]
On the other hand, a voice coil bobbin 11 is attached to the inner peripheral portion of the
diaphragm 10. A voice coil 12 is wound around the voice coil bobbin 11. The voice coil 12 is
supported by the plate 5 and the center pole 6a of the yoke 6. It is adapted to be inserted into
the formed magnetic gap 7.
A damper 17 holds the voice coil 12 in the magnetic gap 7. As the damper 17, for example, a
spiral damper in which a cloth is impregnated with a synthetic resin is used, and the damper 17
has a predetermined compliance (elasticity).
[0006]
Further, an acoustic signal from an input terminal 13a provided at a predetermined position
outside the speaker box 1 is supplied to a terminal 15 of the speaker 3 through a connection line
14a, and an acoustic signal from the terminal 15 is a tinsel wire 16 Through the voice coil 12.
[0007]
Further, a duct 18 having an opening 18a in the same plane as the speaker sound emission hole
2a of the baffle plate 2 is provided, and the phase of the sound emitted from the back surface of
the diaphragm 10 of the speaker 3 is reversed. It radiates to the outside of the speaker box 1 and
widens the low frequency range of the sound emitted from the front of the diaphragm 10.
[0008]
As described above, by employing the phase-reversal type speaker device, the bass reproduction
limit can be lowered compared to the closed type, and low-pass reproduction to about 80% of the
bass resonance frequency f0 of the speaker 3 It is believed that the range can be expanded.
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[0009]
In such a speaker device, the sound radiation force F1 due to the vibration of the diaphragm 10
of the speaker 3 can be expressed by multiplying the effective mass M1 of the speaker 3 by the
moving acceleration α1 of the diaphragm 10 of the speaker, that is, F1 = M1α1. .
With respect to such a sound radiation force F1, the reaction force -F1 directed from the back
side of the diaphragm 10 toward the inside of the speaker box 1 is also remarkable when the
speaker apparatus is small and light and the volume of the speaker box 1 is small. The air in the
speaker box 1 repeats compression and expansion due to the vibration of 10, and this air acts as
a force to return the diaphragm 10 to the original position, thereby swinging the speaker box 1,
and the bass reproduction is inhibited. Had a problem.
[0010]
In order to solve such a problem, the applicant previously proposed a speaker apparatus as
shown in FIG. 3, and in FIG. 3, the corresponding parts to FIG. Detailed description is omitted.
[0011]
In FIG. 3, the speaker box 1 is made of synthetic resin and molded integrally with the baffle plate
2 in the form of a box.
The speaker 3 having the same configuration as that described in detail in FIG. 2 is fixed so as to
face the speaker sound emission hole 2 a formed on the upper side of the baffle plate 2.
The first duct 18 and the opening 18 a disposed on the lower side of the baffle plate 2 are
integrally molded when the baffle plate 2 is molded.
[0012]
In the upper part of the rear plate 1B, a speaker sound emission hole 2b is formed at a position
opposite to the speaker sound emission hole 2a formed in the baffle plate 2, and the second
speaker 3b is preferably used. The second duct 18b is fixed to the rear face plate 1B so that it
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faces the speaker sound emission hole 2b and is larger than the first duct 18 and the second duct
18b is overlapped within a predetermined length of the first duct 18 And an integral mass of air
which radiates to the opening 18a of the first duct 18 through the opening 18c of the second
duct 18b, and is integrally embedded with the rear face plate 1B so that a concentric cross
section is formed. It is configured to increase RD.
[0013]
Further, acoustic signals of the same input are supplied to the first and second speakers 3 and 3b
through the input terminals 13a and 13b disposed on the rear plate 1B and the connection lines
14a and 14b.
[0014]
According to the speaker apparatus of FIG. 3 described above, since the reaction force of the duct
radiation forces FD1 and FD2 between the first and second ducts 18 and 18b-FD1 and -FD2 are
respectively offset, the first and second The reaction forces -F1 and -F2 of the radiation forces F1
and F2 of the two speakers 3 and 3b can be mutually canceled by setting F1 .apprxeq.F2.
[0015]
However, in the above-described configuration, a pair of substantially identical speakers 3 and 3b
are required in the speaker box 1, which makes it difficult to miniaturize the speaker box 1 and is
expensive. There was a problem that
[0016]
Furthermore, in the two loudspeakers in which the vibration systems of the loudspeakers are
made equal, the resonance acuity Q of the higher diaphragm of the bass resonance frequency f0
increases in proportion to the higher bass resonance frequency f0. There was a bad effect that
would be unsuited to the reproduction of the low range.
[0017]
The present invention is intended to provide a speaker apparatus which solves the problems of
overhead, and a compact and light speaker which can prevent swinging of a compact and light
speaker box with a simple structure and can reproduce good bass. It is an attempt to obtain an
apparatus and a speaker.
[0018]
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According to the present invention, there is provided a speaker device having a speaker mounted
on a baffle plate on the front of a speaker box, wherein the sound emission of the speaker is
provided near the center point of the damper of the speaker. A vibration body generating an
acting force in the direction opposite to the sound radiation direction is provided by using a
reaction force in the direction opposite to the direction as a driving force.
[0019]
According to the present invention, since a vibrating body is generated near the middle point of
the damper of the speaker to generate an acting force by using the reaction force in the direction
opposite to the sound radiation direction of the speaker as the driving force. The sound radiation
force of the speaker can be offset by the action force of the vibrator, and the oscillation due to
the radiation of the sound of the speaker box can be eliminated.
[0020]
Therefore, according to the present invention, with the simple configuration in which the
vibrating body is provided near the middle point of the damper of the speaker, the rocking due to
the radiation of the sound of the speaker box can be eliminated and good bass reproduction can
be performed.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an example of an embodiment of
a speaker apparatus according to the present invention will be described with reference to FIG.
In FIG. 1, the portions corresponding to FIGS. 2 and 3 are denoted by the same reference
numerals.
[0022]
FIG. 1 shows a side sectional view of the speaker apparatus of this embodiment, and in the
example of FIG. 1 as well, as in FIG. 2 and FIG.
In the speaker apparatus shown in FIG. 1, the speaker box 1 is molded into a substantially
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rectangular parallelepiped shape by ABS resin or the like, and the speaker 3 is fixed to the
speaker sound emission hole 2a formed in the baffle plate 2 provided on the front of the speaker
box 1. Do.
[0023]
For example, as shown in FIG. 1, the speaker 3 is provided with a ring-shaped magnet 4 and a
plate 5 and a yoke 6 attached so as to sandwich the ring-shaped magnet 4. And the frame 8 of
the speaker 3 is attached to the plate 5, and an edge 9 is provided on the outer peripheral
portion of the diaphragm 10, and this edge 9 forms a cone shape. The outer peripheral portion of
the diaphragm 10 is held by the frame 8.
[0024]
On the other hand, a voice coil bobbin 11 is attached to the inner peripheral portion of the
diaphragm 10, and a voice coil 12 is wound around the voice coil bobbin 11. The voice coil 12 is
a center pole 6a of the plate 5 and the yoke 6. The magnetic gap 7 is formed in such a manner as
to be inserted.
A damper 17 holds the voice coil 12 in the magnetic gap 7.
As this damper 17, for example, a spiral damper in which a cloth is impregnated with a synthetic
resin is used.
The damper 17 has a predetermined compliance (elasticity).
[0025]
Further, an acoustic signal from the input terminal 13a provided at a predetermined position
outside the speaker box 1 is supplied to the terminal 15 of the speaker 3 through the connection
line 14a, and an acoustic signal from the terminal 15 is the tinsel wire 16 To feed the voice coil
12 via
[0026]
Further, a first duct 18 having an opening 18a in the same plane as the speaker sound emission
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hole 2a of the baffle plate 2 is provided, and a second duct 18b having a larger duct diameter
than the first duct 18 is Of the first duct 18 so as to overlap with the predetermined length of the
duct 18 and to be integrated with the rear face plate 1B so as to form a concentric cross section,
and pass through the opening 18c of the second duct 18b. It is configured to emit more air.
[0027]
In this case, the reaction force of the duct radiation forces FD1 and FD2 between the first and
second ducts 18 and 18b-FD1 and -FD2 respectively cancel each other, and the first and second
ducts 18 and 18b The speaker box 1 does not swing by the duct radiation forces FD1 and FD2.
[0028]
Further, the phase of the sound emitted from the back surface of the diaphragm 10 of the
speaker 3 is inverted and radiated from the first and second ducts 18 and 18b to the outside of
the speaker box 1, and this diaphragm 10 The low frequency range of the sound coming out of
the front of is extended.
[0029]
In this embodiment, as shown in FIG. 1, an annular vibrating body 20 of a predetermined mass
M2 along the groove of the damper 17 is attached and fixed near the middle point of the damper
17 of the speaker 3.
[0030]
In this case, the compliance (elasticity) of the damper 17 of the speaker 3 is used, and the
vibrating body 20 acts with the reaction force -F1 in the direction opposite to the sound radiation
direction of the speaker 3 as the driving force and the action in the reverse direction. Force F2 to
be generated.
[0031]
Further, in this case, the vibrating body 20 is provided in the vicinity of the easily vibrating
middle point of the damper 17 of the speaker 3.
Further, by providing the vibrating body 20 on the damper 17, the speaker 3 can be easily
assembled by providing the vibrating body 20 on the diaphragm 10 side of the damper 17.
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[0032]
In this example, the sound radiation force due to the vibration of the diaphragm 10 of the
speaker 3 is F1, and the vibration body 20 is a reaction force in the opposite direction to the
sound radiation direction of the sound radiation force F1 of the speaker 3-F1. Where F2 is the
action force in the direction opposite to the sound radiation direction generated as the driving
force, F1 F F2 (1) holds.
[0033]
Here, assuming that the acting acceleration F2 of the vibrating body 20 is α2, F2 = M2 α2 (2),
and the sound radiation force F1 is F1 = M1 α1 (3) Because of this, the mass of the vibrating
body 20 can be obtained from the formulas (1), (2) and (3).
[0034]
In the present embodiment, by satisfying the above-mentioned equation (1), a vibrating body
generates the sound radiation force F1 of the speaker 3 and the reaction force -F1 in the
opposite direction to the sound radiation force of the speaker 3 as a driving force. It can be
canceled by the action force F2 of 20, and the radiation power of the sound of the speaker 3 is
not impaired, that is, the speaker box 1 does not swing and good bass reproduction can be
performed.
[0035]
Therefore, according to the present embodiment, the vibration body 20 is provided near the
middle point of the damper 17 of the speaker 3, so that the oscillation due to the sound radiation
of the speaker box 1 can be eliminated. There is a benefit that even good bass reproduction is
possible.
[0036]
Of course, the present invention is not limited to the above-described example, and various other
configurations can be adopted without departing from the scope of the present invention.
[0037]
According to the present invention, it is possible to obtain a small and light speaker apparatus
which can prevent the swing of a small and light speaker box with a simple configuration and can
reproduce a good bass sound.
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[0038]
Brief description of the drawings
[0039]
1 is a side sectional view showing an example of the embodiment of the speaker apparatus of the
present invention.
[0040]
2 is a side sectional view showing an example of a conventional speaker device.
[0041]
3 is a side sectional view showing an example of a conventional speaker device.
[0042]
Explanation of sign
[0043]
1. Speaker box 1B Back plate 2. Baffle plate 3. Speaker 6. Yoke 18, 18b Duct 20 Vibrator
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