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JP2011044987

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2011044987
An egg type having a low diffraction effect exhibits very high rigidity as a shell, but a severe
change in internal sound pressure emitted from a speaker causes deformation of the shell in
various vibration modes and is specified as a reproduced sound. Coloring to inhibit high fidelity
reproduction. The sound wave emitted from the rear surface of the speaker unit repeats
reflection in the inner space and becomes turbid sound. In an enclosure that relies on a sound
absorbing material, the transient characteristics of the reproduced sound deteriorate, resulting in
an uncluttered reproduced sound. An egg-shaped speaker system has an enclosure shape in
which low frequency response characteristics are straightforward. The thickness of the outer
shell can be varied continuously to disperse the resonant frequency. The uneven surface can be
molded continuously, and the unnecessary vibration inside can be quickly damped and absorbed
without relying on the sound absorbing material. The shape of the horn opening diameter and
the horn length changes continuously, and the localization of the sound, which is an important
characteristic for music reproduction, can be improved and the wide band can be faithfully
reproduced in a good state. [Selected figure] Figure 3
High performance egg shaped enclosure for speaker system
[0001]
The present invention relates to the combination of the shape of the enclosure used in the
speaker system and its components.
[0002]
Conventionally, the shape of the speaker system enclosure with a low diffraction effect shape has
been studied, but how to construct a high rigidity enclosure with few resonances practically and
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ideally combine the reproduction sound for high sound and bass Positional relationship was an
issue.
[0003]
JP-A-9-307986 JP-A-2005-252782 JP-A-2006-229900 JP-A-2006-262429 JP-A 5-55685
[0004]
The oval outer shape suppresses the disturbance of the frequency in the low frequency
reproduction area due to the diffraction effect, and the resonance frequency of the enclosure
itself is dispersed as an integral type having a different thickness of the outer shell.
The space has an egg-shaped space in which the folds form a spiral, and has a shape that
suppresses the generation of standing waves and quickly attenuates and absorbs sound waves
generated inside without relying on a sound absorbing material.
In addition, the front horn of the treble speaker with a different sound path length is placed in
front of the bass speaker for each sound radiation location, and the localization of the sound is
stabilized by the effect that the high bass is radiated from one speaker as if To
The components of the speaker enclosure having these features are the summary of the present
invention.
[0005]
Even in the case where an oval speaker enclosure with little diffraction effect is integrally formed,
the strong resonance point generated in the enclosure itself causes turbidity to be added to the
reproduced sound.
[0006]
Even if it has an egg-shaped internal space with less generation of standing waves, the speaker
enclosure that relies on the sound absorbing material causes the deterioration of transient
characteristics, resulting in a reproduced sound with less crispness.
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[0007]
When using two speaker units for high and low tones to reproduce a wide band uniformly in an
oval shaped speaker enclosure with little diffraction effect, it is difficult to uniformly synthesize
the reproduced sound from each unit , The localization of the sound gets worse.
[0008]
An object of the present invention is to provide a shape and a structure of a speaker enclosure
capable of solving these problems and reproducing with high fidelity.
[0009]
In order to achieve the above object, according to the present invention, it is an egg shape which
is one ideal shape as an enclosure for a speaker system, and the thickness of its outer shell is
continuously changed to continuously spiral inside. An enclosure having a structure and a shape
for improving sound absorption characteristics by unevenness, and having a structure in which a
high-tone horn whose opening diameter and sound path length change continuously is disposed
immediately in front of a bass speaker.
[0010]
A speaker system using an enclosure having the structure of the present invention does not emit
a characteristic resonance sound, and can reproduce a sound field with a good localization
characteristic at the time of stereo reproduction, with a crisp sound with good transient
characteristics.
[0011]
Enclosure configuration Front view, side view and top view Enclosure configuration Side view
Enclosure body Longitudinal view Enclosure body Horizontal sectional view Enclosure inner
surface High-pitched sound and bass speaker unit Baffle high-pitched front Horn section
[0012]
When an egg-shaped speaker enclosure with little diffraction effect is integrally formed, if the
egg shape is integrally formed, it is possible to exhibit a very high rigidity as a shell.
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However, in the case of the speaker unit attachment hole or the bass reflex type, the attachment
hole of the port is actually opened, and as a result, the rigidity is reduced relative to the pure oval
shape, and the internal sound pressure emitted from the speaker is drastically changed Thus, in
the egg-shaped shell, deformation occurs such that the shell ripples in various vibration modes.
This deformation vibration generates various resonance phenomena depending on the thickness
of the shell and the length of the periphery.
This deformation phenomenon causes a sharp resonance phenomenon at a specific frequency,
and as a so-called box sound, the reproduction sound is colored in a specific manner to inhibit
high fidelity reproduction.
If the inner space is also formed into an oval shape in accordance with the outer shape of the
oval shape, the distance between the inner walls is different at all diagonal portions, and the
space has a feature in which the occurrence of standing waves is reduced.
However, the sound wave emitted from the rear surface of the speaker unit repeats reflection in
the internal space and becomes turbid sound.
This cloudy sound is transmitted through the diaphragm of the speaker unit and radiated to the
front.
In the case of the bass reflex type, the muddy internal sound is radiated to the outside through
the port. A large amount of sound absorbing material is attached in order to absorb and
attenuate the internally reflected sound. In a speaker enclosure that relies on a sound absorbing
material to cope with the internal sound, the transient characteristics of the reproduced sound
deteriorate, resulting in an uncluttered reproduced sound. When an egg-shaped speaker
enclosure with little diffraction effect is adopted, when speaker units for bass and treble are
attached along the egg-shaped outer shape, the direction (sound axis direction) in which each
speaker emits the sound is diffused Direction. When both speakers are aligned in the same
direction as the front of the sound axis, the sound axes of both speakers are spaced apart, so that
the bass and treble are heard from separated positions, and the localization of the sound image is
deteriorated. The following invention is applied to solve the above problems. In order to disperse
the natural resonance frequency of the enclosure made of egg-shaped by solid birch plywood, the
enclosure adopts a structure in which the thickness of the enclosure shell is continuously
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changed. In addition, a structure is formed in which the sound absorption effect is high on the
inner surface of the enclosure, and helical unevenness is added to cause diffuse reflection of
sound. The length of the sound path attached to the front of the speaker is continuously changed
for each passage of the sound, and the horn shape whose cut-off frequency changes continuously
for each sound muscle is incorporated in the enclosure, for bass and treble units Place the sound
generation points (voice coil center point) on the same vertical plane, lengthen the sound path
attached to the front of the high-tone speaker toward the bass unit, and emit the radiated sound
from the high-tone speaker and the bass In the form of an enclosure having mutual positional
relationship between the high-tone horn opening and the low-pitched unit arrangement, in which
the radiated sound of the loudspeakers is continuously mixed.
[0013]
As an example, it is illustrated as follows in attached FIGS. 1 to 7. FIG. 1 shows a front view and a
top view seen from the top as a representative outer shape of the egg-shaped speaker system.
The low-frequency frequency response characteristic of the sound wave emitted from the
speaker is known to be low, and the frequency response characteristic of the low band is known
as a straightforward enclosure shape. 2 shown in FIG. 2 is a baffle portion mounted on the front
of the speaker unit. Although 3 is a high-pitched speaker attachment portion and 4 is a lowpitched speaker attachment portion, the effects of the present invention are completely the same
even if any speaker is attached to 2 without being attached to 1 main body. The details of the
present invention, which is a means for solving the above problems remaining in the speaker
system enclosure of this shape, will be described below. 1. In order to disperse the specific
resonance frequency generated in the enclosure and improve the vibration characteristics, in the
present invention, the thickness of the outer shell of the main body shown in 5 of FIG. 3 is
continuously changed. Although the resonance frequency of the outer shell 5 portion shown by
the main body 1 in FIGS. 3 and 4 depends on the thickness of the outer shell, as in the present
invention, the thickness of the outer shell is continuously changed to make thin portions and
thick portions By forming it, the deformation that occurs on the outer shell surface becomes a
disorganized form, and as a result, the resonance frequency can be dispersed. 2. The wall
surface of the inner space of the main body portion shown in FIG. 2 is formed by continuously
forming a rough surface as shown in the cross section of FIG. 5 according to the present
invention, so that the sound wave inside diffuses and reflects in different directions each time.
Repeatedly, the effect of absorbing the collision to the inner wall surface is enhanced, and
unnecessary vibration inside can be quickly damped and absorbed without relying on the sound
absorbing material. 3. The sound from the high-pitched speaker attached to part 3 of FIG. 2 is
fused with the sound from the low-pitched speaker attached to 4 to aim to faithfully reproduce
broadband sound as a whole. By forming the front horn shape for high sound according to the
present invention as shown in FIG. 7, as shown in FIG. 6, the sound axis 3 of the high sound
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speaker and the low sound axis 4 are as straight as possible at 6 in FIG. Can be fused in the The
sound path length of the treble horn shown in FIG. 7 is different between 7 and 8 parts, and the
shape of the horn opening diameter and the horn length changes continuously, the widest treble
speaker with the largest opening diameter and the long sound path The lowest 8 parts can be
mixed with the sound coming out of the bass speaker in the 6 parts of FIG. 6 which is an ideal
position. As such an effect of the present invention, the sound radiated from the high-tone
speaker and the low-tone speaker is radiated as if it were turned from one turn, and the
localization of the sound, which is an important characteristic for music reproduction, is
improved to be a good Can faithfully reproduce the broadband.
[0014]
A speaker system adopting the present invention has the ability to faithfully reproduce a wide
band, and can be applied to an audio system, a theater system, a studio monitor system, a
loudspeaker system, and the like.
[0015]
DESCRIPTION OF SYMBOLS 1 enclosure main body 2 baffles for speaker units 3 speaker unit
attachment parts for high-pitched sound 4 speaker unit attachment parts for low-pitched sound 5
enclosure outer shell 6 high-pitched sound fusion position 7 high-pitched horn upper diffusion
sound route 8 high-tone horn lower sound fusion sound route
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