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JPH0336896

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DESCRIPTION JPH0336896
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
embedded type in-vehicle speaker, and more particularly to an in-vehicle speaker with improved
directivity. [Background Art] A conventional embedded type in-vehicle speaker has a full range,
or, as shown in FIG. 5, a tweeter (high) through a connecting rod 23 on the front surface of a
diaphragm 22 of a spica unit UY for bass reproduction. Car speaker C5 in which a speaker unit
TY for high frequency reproduction such as area reproduction) or super tweeter (for ultra high
area reproduction) is disposed is used, and is mounted by being embedded in a rear tray portion
27 at the rear of the vehicle interior The volume of the part 31 is arranged to be used as a
speaker cabinet. In the figure, reference numeral 25 denotes a diaphragm of the high-sound
reproduction speaker unit TY, 26 denotes a rear seat, 28 denotes a rear window, and 32 denotes
a ceiling. In the case where an in-vehicle speaker is embedded in the rear tray portion 27, the
wall portions such as the ceiling portion 32 and the rear window portion 28 are present in the
vicinity of the speaker to show reflectivity, and particularly the high sound portion Although
reflection and diffusion of sound waves occur, in the conventional car-mounted speaker cs, the
speaker unit TY for high-pitched sound reproduction is also in such a form that the sound waves
are directed toward the ceiling portion 32 and emitted. Sound waves are reflected and diffused in
the direction indicated by the arrows in the figure. On the other hand, since the listening position
is in a positional relationship perpendicular to the amplitude direction of the diaphragm of the
speaker, the listening position and the direction of the sound wave radiated from the speaker are
different. There is a drawback that the reflection occurs on the wall surface surrounded by the
window portion 28, the indirect sound increases, the interference between the indirect sound and
the direct sound occurs, and the characteristics deteriorate. SUMMARY OF THE INVENTION An
object of the present invention is to provide an in-vehicle type in-vehicle speaker capable of
solving the above-mentioned conventional drawbacks and making the high sound portion sound
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wave nondirectional and improving the directivity of the low sound portion sound wave. [Means
for Solving the Problems] The embedded in-vehicle speaker according to the present invention
has a non-directional speaker unit for high-pitched part reproduction attached to a central axis of
a diaphragm for low-pitched part reproduction via a connecting rod. It is. First, we arrange the
two acoustic conversion units so that the diaphragms face each other as closely as possible, and
emit sound waves in the circumferential direction of the diaphragm by driving the respective
acoustic conversion units in phase. Proposed a nondirectional acoustic transducer (Japanese
Patent Application No. 1-78373), but also in the present invention, the nondirectional speaker
unit having the configuration according to the above proposal is used as a nondirectional speaker
unit for high-pitched sound reproduction. be able to.
Therefore, as a configuration of the non-directional speaker unit for high-tone part reproduction
used in the present invention, the two speaker units are disposed opposite to each other so that
the diaphragms are close to each other, and both speaker units are in phase It is configured to
radiate a sound wave in the circumferential direction of the diaphragm by driving, or it has a
single speaker unit and a reflector having the same shape as that of the diaphragm of the
speaker unit although the characteristics are different. This can be realized by using an
omnidirectional speaker unit which is configured with the reflector and disposed so as to make
the reflector face in proximity to the diaphragm. The shape of the sound path where the sound
waves are radiated in the circumferential direction of the diaphragm is desirably formed in a
horn shape whose cross-sectional area changes with an exponential function or Bessel function,
and further, the overall shape of both opposing speaker units It is preferable to make the cross
section into a substantially elliptical shape. When the nondirectional speaker unit is configured of
one speaker unit and a reflector, the overall shape of the reflector is substantially the same as
that of the speaker unit. The connecting rod for attaching the nondirectional speaker unit for
high-pitched sound reproduction has a shape such that the diameter continuously increases
toward the nondirectional speaker unit side. In this case, the vibration for low-pitched sound
reproduction The directivity of the bass sound wave can be improved by configuring the space
formed between the plate and the connecting rod to have a horn shape whose cross-sectional
area changes with an exponential function or Bessel function. [Operation] When the drive parts
of the two opposing speaker units are driven in phase, the air on the front of the circular
diaphragm is compressed (densely) or attracted (separated) to each other to generate
compression waves, and the pressure in the outer peripheral direction (diaphragm The sound
wave is efficiently radiated in the circumferential direction of the diaphragm and acts as
nondirectional. When a reflector in which one of the facing speaker units is formed in
substantially the same shape as the speaker unit is used, the characteristics are somewhat
different, but the non-directionality is similarly obtained. If the non-directional speaker unit for
high-pitched sound reproduction of the above configuration is attached to the central axis of the
diaphragm for low-pitched sound reproduction via a connecting rod to constitute an in-vehicle
speaker, it is embedded and attached to the rear tray portion. The sound wave in the high-
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pitched part is emitted in the horizontal direction (the direction of the listening position) and thus
matches the listening position, so that unnecessary reflection and diffusion do not occur and the
characteristics are not degraded. [Embodiments] Embodiments of the embedded in-vehicle
speaker according to the present invention will be described based on FIGS. 1 to 4 (A) and (B).
FIG. 1 is a cross-sectional view showing the embedded type in-vehicle speaker attached to the
rear tray portion, FIG. 2 is a cross-sectional view of the nondirectional speaker unit, and FIG. 3
shows another configuration example of the nondirectional speaker unit Sectional views, FIGS.
4A and 4B are graphs showing frequency characteristics and directivity characteristics. In the
figure, C8 indicates the entire embedded type in-vehicle speaker, which is attached to the rear
tray portion 27 in a form embedded in the rear tray portion 27 and arranged so as to use the
trunk portion 31 as a cabinet. The on-vehicle speaker unit C3 is a speaker for high-pitched sound
reproduction attached via the connecting rod 8 to the central axis (coaxial line) of the low-sound
reproduction speaker unit UY and the cone-shaped diaphragm 22 of the low-sound reproduction
speaker unit UY. The high-pitched sound reproduction speaker unit TY is configured as a
nondirectional speaker A, although the unit TY is formed. In the example shown in FIGS. 1 and 2,
the nondirectional speaker A has the two speaker units 1 and 2 facing each other so that their
diaphragms 3.4 are close to the contact distance with the amplitude at the maximum input. By
arranging the drive units 1a and 2a of the respective speaker units 1.2 in series or in parallel and
driving the same phase, compression waves of air are generated to thereby generate sound
waves in the circumferential direction of the diaphragm 3.4. It is intended to be emitted to The
human power signals to both speaker units 1.2 configured as described above are in phase, and
the air in front of both diaphragms 3.4 is compressed (densely) or attracted (sparsely) to each
other to reduce the pressure to the outside of the air. The sound wave is efficiently emitted in the
horizontal direction of the figure through the sound path 5 formed between the two speaker
units 1.2. As a result, the acceleration of air is doubled as compared with the conventional
speaker, and the efficiency of the speaker is doubled, and the vibration systems of both speaker
units 1.2 interact with each other as an acoustic load. The diaphragm 3.4 is a dome-shaped
diaphragm, and forms the sound path 5 in a horn shape in cross section so that sound waves
obtained by in-phase driving can be emitted well in the radiation direction, and reflection and
diffraction generated at the outlet of the horn In order to eliminate the influence of the
phenomenon, the horn wall surface 5a is formed in a symmetrical shape. For this reason, as
shown in the figure, the speaker unit 1.2 is configured such that the entire cross-sectional shape
including the frame 6 and the anti-reflection cover 7 disposed on the back side of the frame 6 is
substantially elliptical. 1.2 is connected by a support lO. Thus, by connecting with the support 10
in the vicinity of the diaphragm 3.4, it is possible to offset the vibration such as reaction and
abnormal resonance which occur in both speaker units 1.2.
In the figure, 1b and 2b denote yokes, 1c and 2c denote magnets, and ld and 2d denote ball
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portions. Although the sound path part 5 is configured to change the cross-sectional area of the
exponential horn with an exponential function such that T (parameter) = 1 and the cutoff
frequency 2200, it may be a horn shape whose cross-sectional area changes due to the Bessel
function. Good. The shape of the connecting rod 8 may be a simple cylinder 8a as indicated by a
broken line, but may be an inverted pyramid so as to continuously increase in diameter toward
the high frequency reproduction speaker unit TY. In the embodiment, the connecting rod 8 is
shaped like the neck portion of the horn so that the space formed between the cone-shaped
diaphragm 22 for bass portion regeneration and the connecting rod 8 is an exponential function
or a Bessel function. Exponential horn of exponential function which is configured to have a horn
shape whose cross-sectional area changes, and the sound path portion 9 formed by the coneshaped diaphragm 22 and the connecting rod 8 has T = 1 and a cutoff frequency of 800 Hz. The
acoustic wave is efficiently propagated in the listening direction. FIG. 3 shows another
configuration example of the nondirectional speaker unit A, which comprises one speaker unit 1
and a reflecting plate 13 substantially similar to the diaphragm 3 of the speaker unit 1 and the
overall shape of the speaker unit 1 as well. It is comprised by the reflector 11 formed similarly to
1 and arrange | positioned so that the diaphragm 3 and the said reflecting plate 13 may
approach and oppose. Compared with the speaker unit 1.2 facing type, this configuration has no
action such as acceleration of air or increase in efficiency, but can obtain nondirectionality. FIG. 4
(A) shows the directivity characteristics of the on-vehicle speaker according to the configuration
example of FIGS. 1 to 3 in the O to 360 degrees horizontal plane, which is a measured value with
one speaker input and a measuring distance of 1 meter. The in-vehicle speaker by the speaker
unit shown in FIG. 2 is a non-directional in-vehicle speaker exhibiting frequency characteristics
like-in all directions as indicated by the solid line V in FIG. 4 (A). As shown by the broken line W
in FIG. 4 (A), the efficiency of the in-vehicle speaker decreases somewhat, but the reflection at the
ceiling 32 decreases as in the case of FIG. An on-vehicle speaker was obtained. FIG. 4 (B) shows
frequency characteristics of the on-vehicle speaker according to the configuration example of
FIG. 1 and FIG. 2, and it is measurement with one speaker input and measuring distance 1 meter
as the upper side. The solid line X in FIG. 4B is a frontal characteristic, the broken line Y is a
characteristic of 30 degrees, and the dotted line Z is a characteristic of 60 degrees.
In the embodiment of FIGS. 1 to 3 described above, the speaker unit UY for bass reproduction is
a cone type as the diaphragm 22, and the speaker unit TY for high-pitched reproduction is a
dome type diaphragm as the diaphragm 3. Although this example is used, it is needless to say
that the same nondirectional speaker can also be used in a flat type or the like having different
diaphragm shapes. According to the embedded in-vehicle speaker of the present invention, the
following effects can be obtained. ■ High-pitched sound waves that cause reflection or diffusion
to the ceiling, rear window, and other reflective walls are emitted in the horizontal direction, and
can be matched with the listening position, increasing the direct component and the directivity of
the speaker It is possible to prevent the high frequency range from being deteriorated due to (2)
Since the bottom side of the speaker unit for high-pitched sound reproduction and the shape of
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the connecting rod are devised, the directivity of the low-pitched sound wave can also be
improved. (2) Since the sound path part is shaped like a horn, the efficiency can be improved and
the diffraction and reflection of the sound wave can be reduced to obtain good characteristics. ■
In the non-directional speaker unit facing the speaker unit, since the two opposing speaker units
are driven in phase, the efficiency is doubled and the vibration corresponding to the driving force
is canceled. This is effective, and furthermore, the two units cancel each other's magnetic flux,
resulting in a magnetic shielding effect.
[0002]
Brief description of the drawings
[0003]
1 to 3 show an embodiment of the embedded in-vehicle speaker according to the present
invention, and FIG. 1 is a cross-sectional view showing the embedded in-vehicle speaker attached
to the rear tray portion, and FIG. 3 is a cross-sectional view showing another configuration
example of the nondirectional speaker unit, and FIG. 4 (A).
(B) is a graph showing frequency characteristics and directivity characteristics. FIG. 5 is a crosssectional view of a conventional embedded in-vehicle speaker. C3: Car-mounted speaker UY: Lowpitched reproduction speaker unit TY: High-pitched reproduction speaker unit A: Nondirectional
speaker unit 1.2 Two opposing speaker units 3.4 = diaphragm, 5.9: sound path, 8 Reference
symbol 11: reflector 11 12: reflector plate 22: diaphragm 27: rear tray portion 28: rear window
portion 31 nido rank portion 32: ceiling portion lO: column FIG. 1 FIG. 3 FIG. 4 (A ) Figure 4
Figure 5
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