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JPH01213098

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DESCRIPTION JPH01213098
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus provided with a phase inversion type cabinet 71. As shown in FIG. [Summary
of the Invention] The present invention provides a pair of partition plates having slins (·) of a
predetermined size inside a cabinet that accommodates two speakers having different low-pass
resonant frequencies f to form an intermediate portion The storage area of both speakers is
separated in the Nakajima range, and communication is made in the low range, and the middle
part and the external space are separated through the boat to the lower fO speaker, so that Most
of them can be used as a phase inversion type, and it is possible to reproduce, with a small
distortion, an elastic and powerful bass and a clear middle and high-pitched sound while being
small. 2. Description of the Related Art Conventionally, small speaker devices have been widely
used because they are easy to use with few restrictions on the installation location. [Section MM
to be solved by the invention] between the upper limit V of the internal volume of the cabinet,
which affects the low range reproduction limit of the speaker device, and the effective radius a of
the speaker unit and the low range resonance frequency fO It is known that there is a small
relation to equation (1). V w: a → / f o ′... Fil With this, in order to reduce the internal volume V
of the cabinet, it is possible that the effective radius d of the speaker 1-1-1 is small and the low
resonance frequency fo is equal. In addition to the difficulty in increasing the allowable human
power, the immediate effect, and the low distortion output, there is a problem that the lowfrequency component is insufficient, and the rebuilt stone is lacking in force. By the way, in order
to expand the low frequency range of the reproduced sound by setting the limit frequency f while
keeping the internal volume of the cabinet constant, the cabinet error I- may be of the phase
inversion type (bass reflex type). It is widely practiced. As is known from +11, the bass reflex type
acoustic wave gives a suitable phase change to the sound wave emitted behind the speaker
diaphragm, and the phase with the I'i + -wave emitted from the front of the speaker It is intended
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to be aligned and radiate. The change of the phase is given by the equivalent weight of the
speaker mounting surface and the stiffness of the air in the cabinet 1 'by providing a speaker. In
this case, Q of the vibrating thread of the speaker is about 0.5 or + Y is preferable. It is also
known that a plurality of speaker units of the same characteristic are accommodated in a single
gap and node and driven in parallel by a sound amplifier in order to increase the low distortion
output of the speaker device. Therefore, we look at the problem of fil statement of the
conventional small speaker device))!
As a matter of fact, in a single bass reflex / socks type cabinet, for example, it is bulky to
accommodate and drive in parallel a speaker 1 disc I · of the same characteristic of 2 + 1 & l.
However, in this case, there is a problem that the back circulation of both speaker units mixes in
the interior of the cabinet -C, and in particular, natural fragments in the middle and III regions
become muddy and audible. In addition, the effective areas of the diaphragms of both SVs 1- 1
are added respectively (the effective area is, for example, doubled, so that the internal volume of
+ jabinenot is 4 The problem is that the expected low range expansion effect does not blur. In
history, when the partition plate is provided inside the cabinet and the individual speakers are
separated, although the middle and high-pitched sound is reproduced clearly, the volume of
cavino in each of the speakers becomes small, and the bass is broken. The problem of being
disadvantageous to This point is about 6%, and in the aspect of the present invention of the
present invention is to provide a speaker device capable of reproducing, in a small distortion, a
loud and powerful low-pitched sound and clear middle and high-pitched sound with a small size.
[Means for Solving the Problems J The present invention accommodates first and second
speakers 71-unit (IL (21 and this second] and second speaker 1)) having different low-pass
resonant frequencies. Cavity 2 No. 1-(10) and Slit (13 s) of each place method. (14s) is provided
with a pair of partition plates (43), (+4), and this pair of partition plates is disposed between the
first and second speaker units in the cabinet with a predetermined distance “C, the first and
second speaker housings (15), (+6) and the middle 1′fH (1 ′ /) are formed, and the middle
portion communicates with the middle through the sound tube (19) It is a speaker device in
which the opening (18) is provided in the cabinet No. I. [Function] According to such a
configuration, the small-sized, elongated, powerful bass and the clear mid-speaker are
reproduced with low distortion. Embodiment An embodiment of a speaker device according to
the present invention will be described with reference to FIGS. 1 to 3. FIG. The construction of
one embodiment of the present invention is shown in FIGS. In both of these figures, (1) and (2)
are speaker units, and one aperture has a diameter of 10 ctm and 12 c 111. Low resonance
frequency is foEny 50) 1z respectively. (02 = 70112, and it is driven in parallel by a summingsmoothing amplifier, the illustration of which is omitted i).
The cabinet (10) is formed in a vertically long rectangular parallelepiped shape, and the speakers
(1) and (2) are attached to the inside of the openings (11) and (12) pierced in the hemostatic
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plate (10f). Between the two speakers (11 and (2), parallel to the top plate (tot) and the clothes
plate (10b) of the cabinet (10), the hemostatic plate (10f) and the back plate (10r) and the twoside handle (10c) and A pair of partition plates (13) and (14) are removed at predetermined
intervals over (10d). Thereby, the inside of the cabinet (10) is divided into upper and lower
speaker storage portions (15) and (16) for storing the speakers (11 and (2), respectively, and an
intermediate portion (17). This middle portion (17) is set in volume to resonate at a
predetermined low frequency fc such as 30011z, for example, and an opening (18) and a boat
(19) formed in the hemostatic plate (lof) And communicate with the external space of the cabinet
(10). The Poe (19) is formed by the partition plates (13) and (14) and two side plates (19a) and
(19b) directly attached thereto. Slits (13s) and (14s) are pierced in the partition plates (13) and
(14), respectively. This slit (13s) and (14! l) is dimensioned to pass only the sound of frequency
not less than fc, ie, to function as a noise filter. For this reason, the mid-high range component
exceeding the frequency (c) is blocked by the partition plates (13) and (14) among the back
direction sounds of the speakers (1) and (2), and both speaker storage portions (15) and ( 16)
become independent in the middle tone range. Then, of the back sounds of the speakers (1) and
(2), only low frequency components of frequency fC or more are separated from the upper and
lower sides of the speaker storage portions (15) and (16), respectively. 14) passes through the
slits (13s) and (14s) and flows into the middle portion (17). As a result, the two speaker housings
(15) and (16) communicate with each other in the low tone range. In this embodiment, the equal
mass 1 of port 1- (19) and the stiff and non-stiffness exhibited by the air of both speaker
housings (15) and (16) are the low resonance frequency f02 of the speaker (2). The speaker (2)
can be used as a bass reflex type for the majority of the volume of the Gabi-no- (10).
As a result, as shown in FIG. 3A and curve B of FIG. 3B, the uniform reproduction range of the
bass is extended to a frequency lower than the low resonance frequency f02 of the speaker (2) to
obtain a stretchy bass. Be In addition, the presence of the above-mentioned intermediate portion
(17) hardly affects the speaker (1) in which the low-pass resonant frequency is high, for example,
f o 1'-2102, and the speaker (1) is approximately the cabinet (10) The entire volume will be used
as a closed type. As a result, as shown in FIG. 3A, above the frequency f + n, the output sound
pressure of the speaker (1) is combined with the output sound pressure of the speaker (2) to
generate a level difference Δp above and below the frequency ro1. In the case of the present
embodiment, the level difference Δp is 2 dB stronger in the case of the present embodiment,
since the output pre-pressures of both speakers (1) and (2) contribute to the synthesized output
sound pressure by area conversion. In the history, in the middle-high range, as described above,
the meat speaker housings (15) and (16) are acoustically separated by the partition plates (13)
and (14), so And (2) can be mixed in the middle III range component component (10) of the
reproduced sound in the reproduced sound, and a clear reproduced neck can be obtained from
the sense of @. In addition, when low-pass resonant frequencies of both speakers (11 and (2) are
both equal to fo2, the cabinet (10) functions as a bus reflex type for both the speakers (1) and
(2). Since the effective areas of the diaphragms of both speakers f1 + and (2) are summed up in
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the same manner as described above, the required volume of the cabinet (10) is, for example,
((42 + 52) 15 "l" bow 2.43. The low frequency reproduction limit frequency is greatly increased
and the expected effect can not be obtained. Moreover, in the above-mentioned embodiment,
although the single port 1- (19) with respect to the speaker (2) with a lower fo is provided, a port
is separately made with respect to the speaker (1) with a higher fo. It can also be set to Mardivo1. As described in detail, according to the present invention, a pair of slits having a
predetermined size is provided inside a cabinet 2 which accommodates two speakers having
different low-pass resonant frequencies 1o. A partition plate is provided to form an intermediate
portion, and the storage portions of the two speakers are separated by a middle 1 (lJ range, and
the lower neck region is continued 1 ffl, and the boat with the lower fo is 1 Since the middle part
and the external space are communicated, most of the volume of the cabinet can be used as a
phase inversion type in the low frequency range, while the small, flexible and powerful bass and
the clear middle quotient As a result, a speaker device capable of producing beef with low
distortion can be obtained.
[0002]
Brief description of the drawings
[0003]
1 and 2 are a perspective view and a longitudinal sectional view showing the configuration of
one embodiment of the speaker device according to the present invention, and FIG. 3 is a
diagram showing the frequency characteristics of the one embodiment of the present invention. .
(11, (21 is a speaker unit, (1o) is a cabinet, (13n, (i4) is a partition plate, (j3s), (14s> a slit, (17) is
an intermediate portion, (] 8) is a bow (-Open 1 ". (19) is a boat (acoustic tube).
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