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DESCRIPTION JPH01314096

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DESCRIPTION JPH01314096
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device suitable for a small speaker device. SUMMARY OF THE INVENTION The present
invention relates to, for example, a speaker device suitable for a small-sized speaker device,
comprising a speaker unit in a small space in a cabinet whose inside is divided into at least two
large and small spaces by partition means provided with communication holes. To improve the
bass characteristics. 2. Description of the Related Art Conventionally, a relatively small speaker
device used for a high fidelity audio device is inferior to a large one in lower frequency
characteristics than a large one. For this reason, ducts and passive radiators have been attached
to the cabinet to improve the low frequency characteristics. FIG. 17 is a view showing an example
of a so-called bass reflex type speaker apparatus to which a duct is attached. (1) shows a cabinet
formed in a vertically long rectangular parallelepiped shape, and an opening is made in the front
face 1 (la) of the cabinet ill. (1b) is provided, and the speaker unit (2) is attached to the inside of
the opening (1b). Then, a small hole (1c) is provided below the front opening (1b), and a
cylindrical duct (3) is attached to the inside of the small hole (1c). FIG. 18 is a view showing an
example of a speaker apparatus attached with a passive radiator, in which a speaker unit (2) is
attached to the inside of an opening (1b) of a cabinet (11 front face Fi (la) A similar opening (1d)
is provided below the opening (lb), and the passive radiator (4) is attached to the inside of the
open IJ (ld). With this configuration, the duct (3) is attached from the small hole (1c) after the
phase of the sound emitted from the back of the speaker unit (2) is reversed by this duct (3). It is
emitted outside and works to enhance the sound pressure in the low range. In addition, with the
passive radiator (4) attached, the sound coming out of the back of the speaker unit (2) vibrates
like the vibration of the passive radiator (4), and the sound emitted from this radiator (4) to the
outside Acts to increase the sound pressure in the low range. [Problems to be Solved by the
Invention] However, although this duct or passive radiator is equipped with the improvement of
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the sound pressure in the low range up to a certain frequency, the sound pressure in the band
below this particular frequency However, there was a disadvantage in that the In view of the
foregoing, it is an object of the present invention to provide a speaker device in which the
frequency characteristic in the low band is further improved.
[Means for Solving the Problems] As shown, for example, in FIGS. 1 and 2, the speaker device of
the present invention is a cabinet (1) whose inside is partitioned into at least two large and small
spaces by a partitioning means (5). And a speaker unit (2) attached to the small space-side
cabinet (1) formed by the partitioning means (5), and the communicating means (5)
communicates two large and small spaces 5a) is provided. [Operation] The speaker device
according to the present invention covers the periphery of the speaker unit by the partition
means, thereby increasing the mass of the vibration system of the speaker unit by the amount of
inertance of the communication 1 of the partition means. The resonance frequency [0 of this
speaker device is lowered accordingly, and the sound pressure in the low frequency range is
enhanced. An embodiment of the loudspeaker apparatus according to the present invention will
be described below with reference to FIGS. 1 to 5. In FIGS. 1 to 5, parts corresponding to FIGS. 17
and 18 are assigned the same reference numerals, and the detailed description thereof will be
omitted. In the speaker apparatus of this example, the cabinet is a closed type. In FIG. 1, (1)
shows a rectangular parallelepiped cabinet, and in this example, the cabinet (1) has a height of
2'7 cm and a width of 15 cm, depth Attach a full-range speaker unit (21) of about 10 cIm in
diameter to the inside of the opening (1b) of the front plate (1a) of the cabinet (1), and a
relatively small one. Then, the periphery of the speaker unit (2) inside the cabinet (1) is covered
with the partition member (5). As shown in FIGS. 1 and 2, this partition member (5) is a box
shape having only a surface open toward the cabinet 1-(110 front plate (1a), and in this example,
the island 12al, width 12 The value is set so that the speaker unit (2) can be accommodated, and
the space a1 around the speaker unit (2) is separated from the cabinet (the other space a2 in 11).
And in the lower part of this partition member (5), for example, a circular communication hole
(5a) having a diameter of about 16 fl is provided. The communication hole (5a) allows the space
a1 facing the partitioned speaker unit (2) to communicate with the cabinet I- (the other space a2
in 11). Here, an equivalent circuit of this speaker device is shown in FIG. 3, and in FIG. 3, the
effective mass of the mono nispeaker ninit and the mechanical resistance of the ni niseri ni
tonite. , Intance (mass of air) Rc of the Mc two communication hole (5a): resistance Sc of the
space a1 in the partition member (5): stiffness of air of the space a1 RB: space a2 outside the
partition & IS material (5) Resistance SB: The stiffness of air in the space a2.
In this equal oil circuit, when considering only the low frequency range of the speaker device, the
resistance Rc of the space a1 in the partition member (5) and the stiffness non-sc of air of the
space a1 can be ignored. It can be converted to an equivalent oil circuit. As can be seen from the
equal oil circuit in FIG. 4, this speaker device is the same as the increase in the mass of the
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vibration system of the speaker unit (2) by the amount of inertance Mc of the communication
hole (5a) of the partition member (5). As a result, the resonance frequency fo of the beaker
device becomes lower, and the frequency characteristic in the low range becomes better. FIG. 5 is
a diagram showing the frequency characteristic of the low band of the speaker device, and a
characteristic r1 shown by a solid line in this figure is a frequency characteristic of the speaker
device of this example. In the characteristic f1 of this example, the sound pressure in the low
frequency region lower than 1z is enhanced and the frequency characteristics in the low
frequency region are enhanced when the partition member (5) is not provided (90 compared to
the characteristic f2 shown by the broken line in the cabinet). Is improved. The characteristics r3
and f4 shown in FIG. 5 show the characteristics when the duct is attached to the cabinet (the
example of FIG. 17) and the characteristics when the passive rugger is attached (the example of
FIG. 18). And the characteristic f3. The speaker device of this example provided with the partition
member (5) has better characteristics than In. In order to convert the equal oil circuit in FIG. 4 to
the equal oil circuit in FIG. 5, the stiffness Sc of the space a1 in the partition member (5) is the
stiffness of the space a2 outside the partition member (5). It is necessary that the size of the
partition member (5) be as small as possible to achieve a good improvement of the low-pass
frequency characteristics. In addition, the frequency characteristic of the high region does not
change by providing the partition member (5). For example, as shown in FIG. 6, this partition
member (6) is formed using a partition member (6) arranged to be in a connected state with the
top plate (1e) of the cabinet (1) of the speaker device. If the communication hole (6a) is provided
in the lower part of the frame, the structure of the partition member (6) is that much? I?
ieになる。 Next, another embodiment of the speaker device according to the present invention
will be described with reference to FIGS. 7 to 10. The speaker apparatus of this embodiment is a
bus reflex type by attaching a duct to the speaker apparatus of FIG. That is, as shown in FIG. 7, a
small hole (lc) is provided below the opening (lb) of the front face JM (la) of (Cabinetso) (1), and a
tubular duct is formed inside this small hole (IC). (3) is attached, and a partition member (5)
having a communication hole (5a) is disposed at a position facing the speaker unit (2) attached to
the inside of the opening (1b) as in FIG. is there.
Here, FIG. 8 shows an equal oil circuit of the speaker device of FIG. In FIG. 8, there are ltp:
mechanical resistance Mp of the duct: inertance C of the duct. In this equal + dli circuit,
considering only the low frequency range of the speaker group; 6, the device resistance Rc of the
space a1 in the partition member (5) and the air stiffness i (c in the space a1 can be ignored. It
can be converted to an equal oil circuit as shown in FIG. This equal oil circuit is obtained by
adding inertance Mc of the communication hole (5a) of the partition member (5) to a general
equal oil circuit of the bass reflex type speaker device, and the speaker unit is equivalent to this
inertance Mc. This is equivalent to an increase in the mass of the vibration system of (2), and the
resonance frequency fO of the speaker device becomes lower accordingly, and the frequency
characteristic in the low range becomes better than that of a general bass reflex type. FIG. 10 is a
diagram showing the frequency characteristic of the low frequency band of the loudspeaker
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apparatus of FIG. 7. The characteristic f5 indicated by a solid line in this figure is the frequency
characteristic of the loudspeaker apparatus of this embodiment. In the characteristic f5 of this
example, the sound pressure in the low region is enhanced more than the characteristic f3 of the
bass reflex type without the partition member (5), and the frequency characteristic in the low
region is improved. Moreover, the speaker apparatus which attached the passive radiator can
also improve the frequency characteristic of a low region by providing a partition member (5)
similarly. That is, as shown in FIG. 11, an opening (1d) is provided below the opening (1b) of the
front plate (1a) of the cabinet (1), and a circular passive radiator about 10 cfll in diameter is
provided inside this opening (1d). By attaching (4) and arranging the partition member (5)
having the communication hole (5a) at a position facing the speaker unit (2) attached to the
inside of the opening (1b) as in the example of FIG. The low frequency characteristics are
improved as well as the bass reflex type. FIG. 12 is a diagram showing the frequency
characteristic of the low frequency band of the speaker device of FIG. 11. The characteristic r6
shown by the solid line in this figure is the frequency characteristic of the speaker device of this
example. In the characteristic f6 of this example, the sound pressure in the low region is
enhanced and the frequency characteristic in the low region is improved as compared to the
characteristic f4 of the passive radiator type without the partition member (5). Next, still another
embodiment of the speaker apparatus according to the present invention will be described with
reference to FIGS. In the case of this (M speaker device, the partition members of the speaker
device of FIG. 1 are doubled. That is, as shown in FIG. 13, the first partition member (7) covers
the periphery of the speaker unit (2) in the cabinet +1), and the periphery of the first partition
member (7) Cover with a second partition member (8) that is larger than the one partition
member (7).
And communication holes (7a) and (8a) are provided in the upper part of the 1st partition
member (7), and the lower part of the 2nd partition member (8), respectively. Here, FIG. 14
shows an equal oil circuit of the speaker device shown in FIG. In FIG. 14, Ro: device resistance SD
of the inside a3 of the first partition member (6): air stiffness MD of the inside a3 of the first
partition member (6): of the first partition member (6) Inertance RD 'of the communication hole
(6a)': device resistance RE of the communication hole (6a) of the first partition member (6):
device resistance SE of the interior a4 of the second partition member (7): second partition
Stiffness M of air in the inside a4 of the member (7) [: ° inertance Ri 'of the communication hole
(7a) of the second partition member (7): device of the communication hole (7a) of the second
partition member (7) In this equal oil circuit which is a resistance, when considering only the low
range of the speaker device, the device resistances Ro and R + of the internal spaces a3 and a4!
Since the stiffnesses So and SE can be neglected, they can be converted to an equal oil circuit as
shown in FIG. As shown in FIG. 15, etc. (as can be seen from the six circuits, this speaker device is
a vibration of the speaker unit (2) by the amount of inertance MD, ME of the communicating
members (73, (81 communication holes (7a), (8a) This is the same as the increase in mass of the
system, and the low frequency characteristics are improved. In this case, in the case where the
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partition members are two cities and the inertance is increased as in this example, only one
partition member is provided as shown in FIG. 1 and the inertance of the communication holes of
the-partition members is provided. The mechanical resistance applied to the diaphragm is
reduced as compared with the case of increasing. In the circuit of FIG. 4 which is an equal oil
circuit of FIG. 1, the mechanical resistance of the communication hole is not shown. If the
mechanical resistance applied to the diaphragm is small, the sensitivity of the speaker device is
increased accordingly, and the sound pressure of the sound to be reproduced is increased. Also
in the case of the speaker apparatus shown in FIG. 13, as shown in FIG. 16, the 2-stop
partitioning member (91, (10) is connected to the upper plate (1e) of the cabinet +1). , And each
partition member +91. Providing the communication holes (9a) and (10a) in (10) simplifies the
configuration of the partition members (9) and (10). Although not shown, partition members
provided with communication holes may be arranged in three or more cities. Furthermore, in the
above embodiment, the speaker unit housed in the partition member is a full range type, but in
the case of a two-way configuration, for example, the high sound speaker unit and the bass
speaker unit may be housed in the partition member. Of course, the present invention is not
limited to the above-described embodiment, and various other configurations can be taken
without departing from the scope of the present invention.
According to the speaker device of the present invention, the resonance frequency fO of the
speaker device is lowered and the high frequency characteristic is not affected by a simple
structure in which only the partition means is provided around the speaker unit. There is a
benefit that the low frequency characteristic is improved and the sound pressure of low
frequency is enhanced.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing an embodiment of the speaker device according to the
present invention, FIG. 2 is a partially broken exploded fIl view of FIG. 1 example, and FIGS. 3 and
4 are equivalent to FIG. FIG. 5 is a circuit diagram, FIG. 5 is a frequency characteristic diagram of
FIG. 1 example, and FIG.
7, 11, 13 and 16 are cross-sectional views showing other embodiments of the speaker apparatus
of the present invention, and FIGS. 8 and 9 are equivalent circuit diagrams of the example of FIG.
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7 respectively. 10 is the frequency characteristic diagram of the example of FIG. 7, FIG. 12 is the
frequency characteristic diagram of the example of FIG. 11, and FIGS. 14 and 15 are equivalent
circuit diagrams of the example of FIG. Each of the figures is a cross-sectional view showing an
example of a conventional speaker device. (1)はキャビネット、(2)はスピーカユニット、
(5)。 (61, (71, (I (1, ('+1 and (10) are respectively partition members, (5a), (6a), (7a), (8a),
(9a) and (10a) are communicating holes respectively) It is.
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