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DESCRIPTION JPH04175098

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DESCRIPTION JPH04175098
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
improvement of speaker device characteristics. [Background Art] FIG. 5 (a) is a front view and a
cross-sectional view showing a conventional speaker device disclosed in, for example, Japanese
Patent Application Laid-Open No. 48-52220. The cabinet body, (2) is a panfull plate in the front
thereof, (3) is a speaker unit of the interior, (4) is a first opening provided for the abovementioned baffle plate for attaching the above-mentioned speaker unit (3), (5 A partition plate
for dividing the interior of the cabinet body (1) into an upper first space (6) and a lower second
space (7), and (8) a second opening formed in the partition plate The part (9) is a third opening
communicating the second space (7) to the outside of the cabinet body (1). FIG. 6 is a mechanical
equivalent circuit diagram of the speaker device shown in FIG. 5. Z is the impedance of the
speaker unit (3), Z is the radiation impedance of the speaker unit (3), and ra and sa are
Equivalent resistance and stiffness determined by the first space (6), m2 and z2 to be z2 are
equivalent mass and equivalent resistance of the second opening (8) provided in the partition
plate (5), rb and sb are Equivalent resistance and stiffness determined by the second space (7) と
なるm、、r。 Is equivalent to the equivalent mass and equivalent resistance of the third
opening (9) provided in the baffle plate (2) to communicate the second space (7) to the outside of
the cabinet body, and z4 is the same as that of the third opening (9). It represents the radiation
impedance. The speaker device of the above conventional configuration is represented by an
equivalent circuit diagram as shown in FIG. 6, and the acoustic energy radiated from the speaker
unit (3) and the third opening (9) is at each impedance 2 □, Z4. It is equivalently represented by
power consumption. In addition, since the order of the low-pass filter for the sound emitted from
the third opening (9) considered to be a bass reflex port can be increased compared to the case
of a normal bass reflex system without the second opening (8) Unnecessary mid-range sound
emission from the boat can be suppressed, and higher quality sound reproduction can be
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performed. In addition, since the port part is configured in two places of the second opening (8)
and the third opening (9) as compared with the case of a normal bass reflex system, the
antiresonance frequency can be set lower It can be said that it is possible to increase the
playback volume of the bass. [Problems to be Solved by the Invention] However, when
attempting to reproduce the bass more than a normal bass reflex system in the above
configuration 1 The sharpness Q of the resonance is abnormal near the high cutoff frequency of
the low pass filter configured in the equivalent circuit In the sound radiation from the third
opening (9), the sound pressure rises sharply as shown in FIG. 7, and due to the rapid phase shift
with the sound radiated from the speaker unit (3).
There is a problem that a sound pressure response can be said to be abnormal. The speaker
device according to the present invention is made to solve the above-mentioned problems, and
the vicinity of the high cutoff frequency from the third opening (bass reflex port) while realizing
bass reproduction more than the ordinary bass reflex system. It is an object of the present
invention to obtain a speaker device capable of obtaining a flat frequency response characteristic
by suppressing only a sudden increase in sound pressure and reducing the phase shift. [Means
for Solving the Problems] A speaker device according to a first aspect of the present invention. A
fourth opening (10) communicating with the outside of the cabinet body is provided in the
second space, and a high-frequency cutoff passive radiator (11) is installed in the fourth opening
(10). In the speaker device according to the second aspect of the present invention, the same
fourth opening (10) is provided with a foam (lla) which is an acoustic resistance to high
frequencies. [Operation] In the speaker device according to the first aspect of the present
invention, the rapid increase in sound pressure in the vicinity of the high cutoff frequency is
suppressed by the passive radiator for high frequency cutoff provided in the fourth opening, and
the speaker device is flat. Frequency response characteristics are obtained. Further, in the
speaker device according to the second aspect of the present invention, the foam serving as the
acoustic resistance to the high frequency in the fourth opening suppresses the rapid rise of the
sound pressure in the vicinity of the high frequency cutoff frequency and similarly Flat frequency
response characteristics can be obtained. Embodiment An embodiment of the first invention of
the present invention will be described below. That is, in FIG. 1 and FIG. 2, the same or
corresponding parts as in FIG. 5 and FIG. In the second space (7), a fourth opening (10)
communicating with the outside of the cabinet body (1) is further opened, and the fourth opening
(10) has a second resonance frequency. The passive radiator (11) set near the high cutoff
frequency determined by the opening (8), the third opening (9), the first space (6) and the second
space (7) is attached It is characterized by the fact that it is That is, FIG. 2 is a mechanical
equivalent circuit diagram of the speaker device according to the first aspect of the present
invention, zo is the impedance of the speaker unit (3), Zl is the radiation impedance of the
speaker unit (3), ra and sa are Equivalent resistance and stiffness determined by the first space
(6), m2 and z2 to be z2 are equivalent mass and equivalent resistance of the second opening (8)
provided in the partition plate (5), and rb and sb Is the equivalent resistance and stiffness
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determined by the second space (7), m3 and r3 which are similarly z.sub.3 and r.sub.3 are
provided in the pan-well plate (2) to communicate the second space (7) to the outside of the
cabinet body (1) The equivalent mass and equivalent resistance of the third opening (9), and z4 is
the radiation impedance of the third opening (9), in particular
Is the equivalent mass m6 of the passive radiator for high frequency cutoff (11) according to the
first aspect of the invention attached to the fourth opening (10) in the second space (7),
equivalent stiffness S equivalent It is an equivalent resistance which consists of resistance rs. As
can be understood from the circuit diagram of FIG. 2, by adding the above-mentioned passive
radiator (11), zs is connected in parallel to 2 ° and Z, and the resonance of the response at the
high cutoff frequency is sharpened. It becomes possible to keep the degree Q low, and it is
possible to suppress the rapid rise of the sound pressure and the rapid change of the phase. FIGS.
3 and 4 show an embodiment of a speaker device according to the second aspect of the present
invention, wherein a fourth opening communicating with the second space (7) to the outside of
the cabinet body (1) is further provided. A second opening (8), a third opening (9), a first space
(6) and a second opening (10); A foam (lla) is attached around the high cutoff frequency
determined by the space (7) to be an acoustic resistance. That is, the addition of the abovementioned foam (lla) causes the equivalent resistance Zs consisting of equivalent mass m6,
equivalent resistance r5 and acoustic resistance r to be connected in parallel with Z3 and Z4 as
shown in FIG. It is possible to suppress the resonance sharpness Q of the response at the range
cutoff frequency to a low level, and it is possible to suppress a sharp rise in sound pressure and a
sharp change in one phase. According to the first and second inventions of the present invention,
as described above, a fourth opening is further provided in the second space, and the fourth
opening is a passive for high frequency cutoff. Since a foam that is an acoustic resistance to a
radiator or a high frequency band is installed, it is possible to suppress a rapid increase in sound
pressure and a change in phase at the high frequency cutoff frequency of the sound radiated
from the third opening, which is favorable. It is possible to obtain a speaker device with good
bass reproduction and frequency characteristics.
[0002]
Brief description of the drawings
[0003]
1 (a) is a front view and a sectional view of a speaker device according to the first invention of
the present invention, FIG. 2 is an equivalent circuit diagram of the speaker device of FIG. 1, FIG.
3 (a) (b) B) is a front view and a sectional view of a speaker device according to the second
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invention of the present invention, FIG. 4 is an equivalent circuit diagram of the speaker device of
FIG. 3, and FIG. 5 (b) is a conventional speaker device 6 is an equivalent circuit diagram of the
speaker device of FIG. 5, and FIG. 7 is a sound pressure characteristic diagram of the sound
radiated from the third opening of the conventional speaker device.
6 in the figure (1) is a cabinet body, (2) is a baffle plate, (3) is a speaker unit, (4) is a first
opening, (5) is a partition plate, (6) is a first space , (7) is the second space, (8) is the second
opening, (9) is the third opening, (10) is the fourth opening, (11) is the passive radiator, (lla) Is a
foam that is acoustically resistant. In the other figures, the same reference numerals indicate the
same or corresponding parts. F / IiIWI 7th figure cycle number (Hl) 9.147 ':' d procedure
correction document (scheme)% formula% 1, indication of the case Patent of 2000 Application
No. 301032 2, Title of the invention Speaker device 3, Person who makes correction Miki Shiki
4, Agent 5, Date of correction command February 12, 1991 (shipment port) 6, Target drawing
number of correction 3 figures
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