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JPH07322385

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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 JPH07322385
[0001]
The present invention provides a supporting member such as a post for attaching a high-pitched
speaker to a yoke which is a magnetic circuit component of a low-pitched speaker, and provides
the high-pitched speaker on the front side of the low-pitched speaker via the supporting member.
The present invention relates to the structure of a coaxial speaker in which [Prior Art]
[0001] The structure of a conventional common coaxial speaker will be described with reference
to FIGS. 13A and 13B. A pillar 22 is provided on the top 21a of the yoke 21 constituting the
magnetic circuit of the bass speaker 2, and the pillar 22 is The high-tone speaker 3 is attached
via the through-hole, and as a result, the high-tone speaker 3 is disposed on the front surface of
the diaphragm 23 of the low-tone speaker 2.
[0002]
Such coaxial speakers are often used in vehicles for the purpose of car audio, and are often
attached to the lower part of the dashboard in front of the driver's seat, the door on the side of
the seat, and the like. Moreover, it is well known that the mounting position of the speaker is set
lower than the position of the driver and the ear of the same passenger due to the restriction
condition by the function and structure of the dashboard and the door.
[0003]
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However, in the case of ordinary home audio, it is assumed that the listener is located in front of
the diaphragm of the speaker and listens on substantially the central axis of the speaker, that is,
the position of the listener's ear and the speaker position at substantially the same height.
However, in general, when listening in a room, it is possible to generally satisfy the premise, but
in the vehicle interior, a situation where a driver or the same passenger listens in a normal room
from the relationship of the mounting position and direction of the speakers. It is almost
impossible to listen on the approximate center axis of the speaker. In other words, the sound
coming out of the speaker is generally heard at an angle of several tens of degrees with respect
to the central axis.
[0004]
Therefore, when using a coaxial speaker for in-vehicle use, the characteristics of the coaxial
speaker at a distance of 1 meter are of course important, but if the directivity characteristics are
not good, listen with a well-balanced sound when actually mounted on the vehicle It is not
possible. In particular, the high-pitched speaker 3 has a reproduction frequency higher than that
of the low-pitched speaker 2 that reproduces the low-mid range, so the directivity becomes
stronger than that of the low-pitched speaker 2, and reproduced sound is obtained only in a
narrow range As described above, since the position of the passenger's ear is far from the axis of
the speaker, the improvement of the high-pitched speaker 3 is required particularly in the onvehicle coaxial type speaker.
[0005]
[Problems to be solved by the invention] However, a common coaxial speaker is referred to as a
cone type, a dome type, or a balance dome type on the front surface of a circular cone type bass
speaker 2 as viewed from the front. A high-pitched speaker 3 is attached, and the high-pitched
speaker 3 is often used in which the diaphragm is a circular diaphragm as viewed from the front.
In the case of a commonly used 6.5-inch coaxial speaker, which is generally used, for example,
the vicinity of about 24 mm from the neck portion 23 a of the cone-shaped diaphragm 23 of the
bass speaker 2 called 6.5-inch A balance dome-type high-tone speaker with an outer diameter of
about 25 mm is disposed near the center of the front of the cone at the position of (1).
[0006]
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The directivity characteristic of this coaxial speaker is as shown in FIG. The directivity
characteristic is a commonly used method, that is, the microphone distance (1 meter) is left as it
is with the speaker at a predetermined angle (e.g., 30 in the case of this conventional example,
60). Etc.) to measure the frequency characteristics at each angle, but in the case of in-vehicle use,
take into consideration the position of the passenger's ear 75. The result is obtained by
measuring the frequency characteristic rotated and moved to The solid line shown in the figure is
on axis (0. The frequency characteristic in), the broken line is 75. Shows the frequency
characteristics at
[0007]
The directivity of a coaxial speaker in which a high frequency speaker 3 having a circular
diaphragm is disposed in the vicinity of the front center of the low frequency speaker 2 having a
circular diaphragm exhibits the directivity of the speaker. As a matter of course, there is no
change in the directivity of the upper, lower, left or right side of the. Therefore, even when the
vehicle is disposed at a door or the like, since the directivity is constant, it is virtually impossible
to control the directivity in accordance with the acoustic condition in the vehicle interior.
[0008]
Therefore, conventional general-purpose coaxial type speakers for vehicles set sound conditions
based on this assumption on the assumption of an average interior shape of the vehicle, and
designed and manufactured a speaker with performance that met the conditions. The shape of
the vehicle interior varies depending on the vehicle type, and the acoustic conditions are
different depending on the material of the interior of the vehicle interior, so there are very many
types of acoustic conditions, and it is a reality that only rough correspondence has been made, In
particular, it is difficult to control the directivity of the high-tone speaker 3.
[0009]
In the means corresponding to this situation, that is, in the method of improving the directivity of
the high-tone speaker 3 of the coaxial speaker using a circular diaphragm as viewed from the
front, as shown in FIG. The method of inclining to the cross-sectional central axis of the speaker 2
is general, but in this method, the frame 37 of the high-tone speaker 3 and the magnetic circuit
etc. of the high-tone speaker 3 are inclined. As a result, the stroke of the diaphragm 23 is limited.
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[0010]
In order to secure this stroke, the mounting position of the high-tone speaker 3 must be
increased, and this method has the disadvantage of worsening the space factor, and it has an
advantage for compactness, especially for vehicles that place importance on mount depth etc.
This is a fatal defect in a speaker, and has a defect that the mounting structure of the high-tone
speaker 3 is complicated.
[0011]
On the other hand, as a method of improving the directivity of the speaker, it is considered as
one method to make the diaphragm elliptical as viewed from the front of the speaker, and the
speaker having the elliptical diaphragm is generally used as a bass speaker or full range speaker
It is well known that the directivity in the minor axis direction is weaker than the directivity in
the major axis direction of the diaphragm (sound is diffused in the minor axis direction).
[0012]
As an application of this method, a circular diaphragm 31 is used in the high-tone speaker 3 of
the coaxial speaker, and on the diaphragm, a circular horn whose throat side matches the
diaphragm and an oval horn whose opening side is elliptical is installed It has been proposed to
improve the directivity.
However, in this method, the length of the horn degrades the space factor, and this is a fatal
defect similar to the above in the case of an on-vehicle speaker where compactness is important.
Further, the addition of the horn makes the structure complicated and increases the weight,
which is disadvantageous to the weight reduction required for the recent on-vehicle speaker.
[0013]
Therefore, the object of the present invention is to solve the drawbacks of the conventional one
as described above and to improve the directivity characteristics, particularly the directivity
characteristics of the high-tone speaker, which is compact and high-performance, and is an onvehicle coaxial speaker To provide an optimal speaker structure.
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[0014]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
provides a support member such as a post on a yoke which is a magnetic circuit component of a
speaker for bass, and for the speaker for bass according to the present invention, In a coaxial
speaker having a high-pitched speaker mounted on the front side, a high-pitched speaker in
which at least the outer peripheral portion of the diaphragm has an elliptical shape when viewed
from the front, the central axis of the diaphragm is the diaphragm of the bass speaker It arranges
so that it may be located on the central axis of, or near the central axis.
[0015]
In the one in which the high-pitched speaker is fixedly arranged on the support member, the
mounting angle of this coaxial speaker is variably adjusted at the time of mounting to optimize
the directivity according to the position of the passenger's ear and the conditions in the
passenger compartment. Attach as you can get.
Further, the high-pitched speaker can be rotatably supported with respect to the central axis of
the support member, and the directivity at the listening position can be varied by adjusting the
rotation of the high-pitched speaker.
[0016]
[Function] A small high-pitched speaker that can be used for a coaxial type in which the outer
peripheral portion of the diaphragm is viewed from the front as an elliptical shape has not been
generally produced, and the high-pitched speaker has been incorporated. The overall
performance of the coaxial type speaker in the case, for example, the influence on the bass
speaker due to the installation situation of the high sound speaker, the performance confirmation
such as the directivity as the high sound speaker, and the like are not performed.
[0017]
We previously proposed an elliptical shaped high-pitched speaker, but this high-pitched
loudspeaker can be used as it is.
The coaxial speaker configured as described above is characterized in that the elliptical
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diaphragm has a feature in which the sound spreads in the minor axis direction, so that the
coaxiality is deviated in directivity in the high sound speaker area compared to the conventional
coaxial speaker. Type speaker, and by setting the angle of the high-tone speaker to an arbitrary
angle when attaching this speaker, it is possible to provide the passenger with a well-balanced
reproduced sound than the conventional coaxial-type speaker. It becomes possible to offer.
[0018]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the
present invention will be described with reference to FIGS. 1 to 12. The same reference numerals
as in the conventional coaxial speaker described with reference to FIGS. 13 to 15 denote the
same parts.
The diaphragm 23 of the low frequency speaker 2 in the coaxial speaker SP is made of a carbon
fiber woven fabric coated with an epoxy resin, which is used as a binder and thermoformed into a
cone shape with a depth of about 15 mm and then pressed The diaphragm is 107 mm in
diameter, and the inner diameter of the neck 23a is trimmed to 31.1 mm. Furthermore, an edge
(suspension) 23b called a so-called roll edge 16 mm wide and 8 mm in radius is arranged on the
outer peripheral part of the diaphragm. The pasting margin portion of the outer peripheral
portion of the edge 23 b is bonded to the flange portion provided on the outer peripheral portion
of the frame 24 of the low frequency speaker 2.
[0019]
24 is a frame of the bass speaker 2 and 25 is a magnetic circuit of the bass speaker 2. A
magnetic gap 27 formed by the yoke 21 and the top plate 26 has an inner diameter of 29.95
mm, an outer diameter of 32.25 mm, and a gap width of 2 .. It is 3 mm.
The voice coil 28 is disposed in the magnetic gap 27, and the voice coil 28 and the neck portion
23a of the diaphragm 23 of the low frequency speaker 2 are bonded.
[0020]
A hole 21b is provided at the center of the yoke 21 which is a magnetic circuit component of the
low frequency speaker 2, and a support 22 serving as a support member for attaching the high
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sound speaker 1 is adhered to the top 21a of the low frequency speaker 2 Furthermore, a tap
processing 12a is applied to the center of the bottom of the yoke 12 of the high-pitched speaker
1, and a screw 21d is inserted into the hole 21b from the bottom of the yoke 21 of the lowpitched speaker 2 as shown in FIGS. The support 22 is fixed so as to be sandwiched between the
yoke top 21 a of the bass speaker 2 and the bottom of the yoke 12 of the treble speaker 1.
[0021]
Since the support 22 has a length of 25 mm and the thickness of the high-tone speaker 1 is 9.9
mm, the position of the diaphragm 11 of the high-tone speaker 1 is about 35 mm from the yoke
top 21 a of the low-frequency speaker 2. , And is disposed on the central axis of the front surface
of the diaphragm 23 of the bass speaker 2.
Further, a hole 21c for passing the input lead wire 21e of the high sound speaker 1 is provided
next to the hole 21b, and after passing through a network circuit, the hole 21c is connected
through the lead wire 21e.
[0022]
The high-pitched speaker 1 is a speaker having an elliptical shape as we proposed earlier.
Describing this in detail, as shown in FIGS. 2 (A), (B) and (C), the outer peripheral shape 11a seen
from the front of the diaphragm 11 has an elliptical shape with a major axis of 33 mm and a
minor axis 22 mm. It is corn-like. Therefore, the elliptical shape continues to the neck portion,
and the voice coil 14 also has an elliptical shape with a major diameter of 15.46 mm and a minor
diameter of 10.13 mm.
[0023]
In the case of this embodiment, since the diaphragm 11, the voice coil 14, and the chamber 15
are integrally molded, as a matter of course, the chamber 15 (dome portion) is also elliptical. The
magnetic gap 16 has a width of 1.3 mm, and the magnet 13 uses an elliptical neodymium
magnet having a major diameter of 35 mm, a minor diameter of 24 mm, and a thickness of 2
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mm, and the center portion of the bottom of the yoke 12 has a tapped hole 12a. It has been
applied. The frequency characteristic of one meter on the axis of the high-pitched speaker 1 is
shown in FIG.
[0024]
A network circuit as shown in FIG. 4 is added, and as a result of measuring the on-axis frequency
characteristic synthesized of both the bass speaker 2 (woofer) and the high-tone speaker 1
(tweeter), the result is as shown in FIG. I got the characteristics. Furthermore, the directivity
characteristic of the speaker in this state (75. The result is shown by the broken line in FIG. 6 and
FIG. 6 is measured from the minor axis direction 1a of the diaphragm 11 of the high sound
speaker 1 and FIG. 7 is measured from the major axis direction 1b of the diaphragm 11 of the
high sound speaker 1.
[0025]
Considering the directivity of the on-vehicle coaxial speaker SP configured as described above,
the directivity characteristic in the minor axis direction 1a and the directivity characteristic in the
major axis direction 1b are clearly different from around 3 kHz to around 20 kHz Was
confirmed. Therefore, unlike the conventional coaxial type speaker, it is possible to more
effectively provide the reproduced sound by adjusting and attaching the angle of the high-tone
speaker 1 at the time of on-vehicle in accordance with the shape etc. of the vehicle interior.
When the speaker of this embodiment was removed, the speaker of this embodiment was
attached to the same place, the angle of the high-tone speaker was adjusted, and comparison
audition was performed, sound quality evaluation much better than that of the conventional
example could be obtained.
[0026]
Moreover, when it attached to the door of another car and experimented, as shown in FIG. 8, it is
about 30 with respect to this reference axis by making the line from the position of a passenger ¦
crew's ear to the speaker for trebles a reference axis. The angled attachment is most effective,
and when attached to the door of another car model, such as a one box car, it is about 20 as
shown in FIG. The setting value of was effective.
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[0027]
In the case of the above-described embodiment, the shape of the diaphragm 11, the voice coil 14
and the chamber 15 are all elliptical for comparison with the conventional speaker, but only the
diaphragm (cone) 11 is elliptical. It goes without saying that the reference numeral 14 and the
chamber 15 may be circular as in the prior art, and the dome-shaped diaphragm and the voice
coil portion may be an elliptical diaphragm or the like.
[0028]
11 and 12 are perspective views showing an example in which the above-described coaxial
speaker SP is implemented as a stand-type speaker in home audio.
[0029]
According to the structure of the speaker of the present invention, it is found that the directivity
characteristic of the high sound speaker area is improved in the minor axis direction, and when
the coaxial type speaker is mounted in the vehicle compartment, It is extremely effective for
adjusting the directivity of the high-tone speaker by adjusting the angle of the high-tone speaker
according to the position of the person's ear, the shape of the vehicle interior, etc. Can be
provided.
[0030]
Moreover, since the compact is the same as the conventional one, the mount depth does not
change either, and it is possible to make the external dimensions identical to those of the
conventional coaxial speaker. The angle of the high-tone speaker can be changed by intentionally
changing the position of the mounting hole of the low-frequency speaker when attaching the
coaxial speaker to a door etc. The goal is easily achieved.
[0031]
This feature offers significant advantages, especially in automotive speakers.
That is, the bass speaker of the conventional coaxial speaker for door mounting has a common
attachment hole pitch in consideration of compatibility, and the external dimensions of the
mount dip and the like are completely the same, so that the conventional mounting is performed.
It is possible to easily adjust the directivity simply by replacing the existing speaker with the
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speaker of this embodiment.
[0032]
Also in angle adjustment, it is common for the frame of the conventional bass speaker to be
provided with a large number of mounting holes, approximately 30.
〜45。
It is possible to change the mounting angle within a range of degrees.
Therefore, the angle adjustment of the high sound speaker can be generally satisfied within this
category, and even if the angle adjustment of the high sound speaker can not be satisfied with
the pitch of the conventional mounting holes, the pitch of the mounting holes provided in the
frame Further, it is possible to easily cope with this because it can be provided with finer
dimensions.
[0033]
Also, as shown in the embodiment of FIG. 10, the supporting member as the supporting member
has a rotatable structure including a rotating shaft and a bearing, and the high sound speaker
can be changed in mounting angle by rotating around the central axis when viewed from the
front It is possible to easily provide a mechanism that can be made to perform adjustment in the
vehicle interior more easily. This variable structure is a mechanism that is extremely complicated
to be installed on the yoke of a bass speaker in the prior art and loses compactness, but in the
present invention, it is a rotation mechanism, and the center is viewed from the front. It is
basically an extremely simple structure than the conventional variable mechanism. Therefore, it
is possible to easily incorporate this variable mechanism into a coaxial speaker.
[0034]
Furthermore, the coaxial speaker according to the present invention can also be used for home
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audio, and as in the embodiment of FIG. 11, wide-area lateral directivity can be obtained by
arranging an elliptical diaphragm longitudinally. Can be improved, and you can get a sense of
sound spread. When the variable function as described above is provided, the directivity can be
easily adjusted in accordance with the installation conditions of the speaker, the shape of the
room, and the like. For example, when the speaker is installed at a position higher than the
position of the listener's ear, the rotation angle of the high-tone speaker can be adjusted as
shown in FIG. It is possible to easily provide audio playback sound.
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