JPS5227246

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DESCRIPTION JPS5227246
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cutaway oblique view showing an
example of use of the present invention, and FIG. 2 is a partial cutaway oblique view of a filling
material. 1 · · · · · · · · · · · · · · · · · filling material. 1 1 2 1 115
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bass reflex
encoder of a bass reflex type loudspeaker system. In the bass reflex type speaker system, the
cabinet body is provided with a duct-like sound path, the sound wave emitted from the back of
the speaker cone of the dynamic type speaker is reversed in phase, and the sound wave emitted
from the front of the speaker cone acts to strengthen ) 8 従 来 4 く sand 壺 1 従 来 ヵ ヵ 従 来 従
来 従 来 従 来 従 来 従 来 従 来 従 来 従 来. 4F-shore 4 In addition to the sound absorbing
material such as felt, it was stretched again. However, in the conventional structure, the sound
absorbing material or the cloth vibrates, and thus, it has been made a persuasion to add a mass.
The present invention seeks to ameliorate the disadvantages. Oh, it is divided into three on c2A
by the sound barrier, and add new letters 2 □ and 9 □□. . , □ 1 □ □ 10)-Add an embodiment
of the present invention will be described with reference to Fig. 1 and Fig. 2 In Fig. 1 (1) is a
cabinet body, this cabinet body (1) Install a baffle plate (2) on the front of the and attach the
dynamic lid speaker (3) to the top of this baffle plate (2). In addition, a through hole (4) is bored
in the lower part of the baffle plate (2) (2) (2), and a duct body (5) for phase reversal is disposed
in the through hole (4) in the cabinet body (1). Fasten the front end of the The duct body (5) is
formed by axially dividing the sound path (7) consisting of the inner space portion of the
cylindrical body (6) into three in the axial direction by the flat partition wall (8a). Then, although
the sound wave emitted from tm of the speaker (3) is different in phase with the sound wave
emitted from the front of the speaker (3), it is emitted from the back of the speaker (3) into the
cabinet body fil The sound waves pass through the sound path (7) in the duct body (5) to be
phase-reversed, and act to strengthen the front sound waves of the speaker (3). In this case, the
contact resistance when the air vibration flow of sound waves passes through the sound path (7)
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increases, the flow velocity is damped, and the sound path (7) in the duct body (5) is narrowed
and the sound path (7) The resonance in the inside is suppressed. (3) As shown in FIG. 3, the
body (5) of the ice peha is closely fitted with the cylindrical partition walls (84) and (8c) having
different inner diameters in the cylinder (6) as shown in FIG. The sound path (7) is divided into a
plurality of pieces, and a plurality of flat partition walls (8d) are arranged in parallel in the axial
direction in the cylindrical body (6) as shown in FIG. Further, the sound path (7) may be divided
into a plurality of parts by interposing a gauze-shaped partition (8,) between the gaps 411 (8d).
Then, when the air flow of sound waves passes through the sound path (7), the flow resistance is
further greatly affected by the contact resistance, and the flow velocity is further strongly braked.
In addition, the woofer of inner diameter 30a11 was attached to the cabinet main body of 681
volume, and the sound path of inner diameter 8 was provided in the duct body, and as a result of
experiment, the minimum number of resonant circumferential liquids was able to be lowered.
Further, FIG. 5 shows the measurement of the frequency (4) 箒 逢 t number characteristics of the
sound pressure immediately before the duct body under the same conditions as the abovementioned ones, the solid line (Alf 1 of the present invention uses the bass reflex enclosure. Is
the characteristic curve of the object, and the broken @ 1 B; is the characteristic curve of the
friend using the bass reflex enclosure with the basic duct body attached with no gap in the inner
space of the conventional cylindrical body. It was confirmed that 300H2 had the effect of
increasing the sound pressure. According to the present invention, the sound path is divided by
the partition wall to form two or more plural passages K, thereby increasing the contact
resistance when the air vibrational flow of the sound wave passes through the sound path to
increase the flow velocity. By damping, the sound path in the duct body can be narrowed to
damp resonance in the sound path, and characteristics can be improved such as increasing the
sound pressure particularly in a low frequency region. (5) Sakai, work January knee +:
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