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JP2001298787

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DESCRIPTION JP2001298787
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the
field of acoustic speaker devices.
[0002]
2. Description of the Related Art FIG. 15 is a cross-sectional view showing a conventional speaker
apparatus, showing a structure in the case of being mounted on a door of a vehicle interior of a
car. In FIG. 15, a speaker 101, which is a main body of the speaker device, includes a diaphragm
102 for generating a sound wave and an electromagnetic circuit for driving the same. The
structure around the speaker 101 includes a frame 103 for holding the diaphragm 102, a gasket
104 for maintaining airtightness of the space before and after the diaphragm 102, and a sponge
for bringing the gasket 104 into close contact with the interior material (not shown) of the door.
The waterproof cover 107 protects the diaphragm 102 from raindrops and the like entering the
inside of the door, and this waterproof cover 107 is provided on the inside of the vehicle door. It
is attached to the inner panel 108 which is a member by fixing with a screw 109. Here, reference
numeral 110 denotes a reference axis which is a central axis of vibration of the diaphragm 102.
[0003]
In general, in the speaker 101, in the oblique direction inclined from the center direction of the
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reference axis 110, the sound pressure level in the middle to high range tends to be low due to
the directivity frequency characteristic. Therefore, the orientation of the reference axis 110 is
attached at an angle so as to be as close as possible to the direction of the listener. For example,
in the in-vehicle speaker 101, as shown in FIG. 15, the seat surface of the inner panel 108 is
inclined, and when the speaker 101 is attached with the screw 109 via the waterproof cover 107,
the reference axis of the speaker 101 The orientation of 110 is directed to the direction of the
passenger who is the listener. The seat surface of the inner panel 108 is pressed using a press
die designed and manufactured to have a predetermined predetermined inclination angle, and
the attachment angle of the speaker 101 is fixed by this.
[0004]
In general, the directional frequency characteristics of the speaker 101 differ depending on the
type of the speaker 101 used. For this reason, when the speaker 101 is attached to a vehicle, the
angle of the mounting seat surface that provides the best sound quality for the passenger who is
the listener varies depending on the type of the speaker 101 used.
[0005]
FIG. 16 is a block diagram showing the arrangement of a conventional on-vehicle speaker device.
Generally, in the speaker 101 used for in-vehicle stereo audio equipment, as shown in FIG. 16,
the left speaker 101a and the right speaker 101b are symmetrically attached to the left and right
doors of the vehicle interior. As described above, in order to attach the speakers 101a and 101b
to the inner panels 108 of the left and right doors symmetrically, the shape of the mounting seat
of the inner panel 108 is also symmetrical.
[0006]
In the conventional speaker apparatus as described above, particularly when mounted on the
door of a vehicle, the mounting angle of the speaker 101 is the inclination angle of the seat
surface of the inner panel 108 which is a member of the vehicle door. Since the positional
relationship between the door and the passenger seat differs depending on the vehicle type, the
inclination angle of the seat surface of the inner panel 108 has to be designed for each vehicle
type.
[0007]
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Also, for example, even if the seat surface of the waterproof cover 107, which is the mounting
portion of the speaker 101, is uniquely inclined, setting the inclination angle according to one
vehicle type is optimal for other vehicle types having different vehicle interior dimensions. There
is a problem that a certain inclination angle can not be obtained.
[0008]
In addition, since the directivity frequency characteristics differ depending on the type of the
speaker 101, for example, when the listener attaches the new commercially available speaker
101 selected by him to the vehicle door, the inclination angle of the seat surface of the inner
panel 108 of the existing door However, the directivity frequency characteristics of the new
speaker 101 do not match, and there is a problem that a good sound quality can not be obtained.
[0009]
Furthermore, even if the vertical direction of the seat surface of the inner panel 108 of the
vehicle door to which the speaker 101 is attached is directed in the direction of the passenger
who is the listener, for example, in the case of a vehicle with right handle specification, the
reference axis of the right speaker 101b The direction of 110 is directed to the direction of the
passenger sitting in the driver's seat, and the direction of the reference axis 110 of the left
speaker 101a is directed to the direction of the passenger sitting in the front passenger seat.
Therefore, for example, when the passenger gets on only the driver's seat, the sound generated
from the right speaker 101b is good for the passenger, but the sound generated from the left
speaker 101a is an occupant whose left speaker 101a sits in the assistant's seat Since the
angular frequency is attached, the directional frequency characteristic is deteriorated and inferior
to the sound generated from the right speaker 101b, and there is a problem that the sound field
becomes asymmetric.
[0010]
The present invention has been made to solve the above-mentioned problems, and it is an object
of the present invention to obtain a speaker device whose direction can be changed in
accordance with the direction of the listener.
[0011]
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In the speaker device according to the present invention, a rotation reference surface forming
means for forming a rotation reference surface, a rotation surface forming means for forming a
rotation surface rotatable along a rotation reference surface, and The speaker comprises a
speaker attached to the rotation surface forming means at a predetermined angle with respect to
the rotation reference surface, and the reference axis orientation of the speaker is made variable
by the rotation of the rotation surface forming means.
[0012]
In the speaker device according to the present invention, the rotational surface forming means is
either a frame or a gasket or a waterproof cover.
[0013]
Further, in the speaker device according to the present invention, the structure for shielding the
sound wave generated from the speaker is disposed at a position separated by a predetermined
distance or more from the reference axis of the speaker.
[0014]
Further, in the speaker device according to the present invention, a fixing means for fixing the
rotation of the rotational surface forming means is provided.
[0015]
Further, in the speaker device according to the present invention, the airtight holding means for
holding the airtightness of the space before and after the speaker by fitting the concave and
convex portions is provided.
[0016]
Further, in the speaker device according to the present invention, a rotational drive means for
rotationally driving the rotational surface forming means is provided.
[0017]
Further, in the speaker device according to the present invention, a listener position detection
means for detecting a listener position, a determination means for determining a speaker rotation
angle based on the detected listener position, and a determined rotation angle. A control means is
provided to drive and control the rotational drive means based on the above.
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[0018]
DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment
FIG. 1 is a cross-sectional view of the speaker device showing the first embodiment.
In FIG. 1, a speaker 1 which is a main body of the speaker device is constituted of a diaphragm 2
which generates a sound wave and an electromagnetic circuit which drives the diaphragm 2.
The structure around the speaker 1 includes a frame 3 as a rotational surface forming means for
holding the diaphragm 2 and forming a rotational surface at the time of rotation, a gasket 4 for
maintaining airtightness of the front and rear space of the diaphragm 2, and a gasket 4 A
cushion 5 made of an elastic material such as sponge, which adheres to a door interior material
(not shown), an input terminal 6 for inputting an acoustic signal, and a waterproof cover 7 for
protecting the diaphragm 2 from raindrops and the like entering the inside of the door. A
speaker base 11 as a rotation reference surface forming means having a mounting portion and
forming a rotation reference surface, and a rotation control cover 12 for restricting rotation.
When this speaker device is mounted on a vehicle, it is mounted by fixing the speaker base 11 to
an inner panel 8 which is an inner member of a door of the vehicle with a screw 9.
Here, 10 is a reference axis which is the central axis of the vibration of the diaphragm 2, 13 is a
concave gap formed by the speaker base 11 and the rotation regulating cover 12, 14 is provided
on the frame 3 and the rotating surface at the time of rotation A flange portion 15 is a rotation
axis which is a central axis of rotation of the speaker 1, and a rotation reference surface 16 of the
speaker 1 is shown.
[0019]
Next, the detailed structure is described.
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In FIG. 1, the rotation reference surface 16 of the speaker 1 and the inner panel 8 of the door are
parallel, and the reference axis 10 of the diaphragm 2 is inclined at an angle of 10 ° with
respect to the rotation axis 15 orthogonal to the rotation reference surface 16. Thus, the case
where the shape of the frame 3 has a tilted structure is shown.
The frame 3 and the waterproof cover 7 are fixed by bonding or the like.
The frame 3 is provided with a disk-like flange portion 14 centered on the rotation shaft 15, and
this portion becomes a rotation surface at the time of rotation.
The diaphragm 2 of the speaker 1 is fixed to the inclined surface of the frame 3, and the
reference axis 10 of the diaphragm 2 is inclined at an angle of 10 ° with respect to the rotation
axis 15.
The speaker base 11 is structured to be attached to the inner panel 8 with a screw 9. In the
speaker base 11, a round hole having a diameter larger than the diameter of the waterproof
cover 7 and smaller than the flange portion 14 of the frame 3 is opened. By dropping the speaker
1 into this round hole, the flange portion 14 is formed on the speaker base 11 It is in the state of
getting on. The flange portion 14 and the speaker base 11 are in contact with each other at a
surface, and this surface is the rotation reference surface 16 of the speaker 1. The rotation
restricting cover 12 is fixed to the speaker base 11 to prevent the speaker 1 from falling off from
the speaker base 11, and at the same time, the flange portion 14 is formed by the concave gap
13 formed between the speaker base 11 and the speaker base 11. It encloses, and the shake at
the time of rotation of the speaker 1 is regulated.
[0020]
Next, the operation at the time of rotation will be described. FIG. 2 is a perspective view at the
time of rotation of the speaker device showing Embodiment 1, and FIG. 3 is a cross-sectional view
thereof. The speaker 1 is restricted in rotational blurring by the concave gap 13 formed by the
speaker base 11 and the rotation regulating cover 12, and rotates around the rotation axis 15
orthogonal to the rotation reference surface 16. Since the reference axis 10 is inclined at an
angle of 10 ° with respect to the rotation axis 15, the azimuth of the reference axis 10 draws a
circle at an angle of 10 ° around the rotation axis 15 when the speaker 1 rotates. Will change.
FIG. 2 (1) and FIG. 3 (1) are a perspective view and a cross-sectional view in the case where the
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rotation angle is 0 °. FIG. 2 (2) and FIG. 3 (2) are a perspective view and a cross-sectional view
in the case of rotating 90 ° clockwise about the rotation axis 15. In this case, when viewed in a
cross-sectional view, the rotary shaft 15 and the reference shaft 10 appear to coincide with each
other, but while the rotary shaft 15 is parallel to the paper surface, the reference shaft 10 is
inclined 10 ° toward the paper surface side. Become. FIG. 2 (3) and FIG. 3 (3) are a perspective
view and a cross-sectional view in the case where the rotation angle reaches 180 ° in total by
further rotating 90 ° around the rotation axis 15. As described above, when the speaker 1 is
rotated, the orientation of the reference axis 10 is three-dimensionally inclined at an angle of 10
° with respect to the rotation axis 15 which indicates a direction perpendicular to the surface of
the inner panel 8 which is a mounting surface. Change to For example, at a position 70 cm away
from the mounting surface, the orientation of the reference axis 10 changes in a circle with a
radius of about 12 cm with respect to the rotation axis 15. Also, at a position 100 cm away from
the mounting surface, the orientation of the reference axis 10 changes in a circle with a radius of
about 18 cm with respect to the rotation axis 15.
[0021]
Next, the change in the frequency characteristic of the reproduced sound when the direction of
the reference axis 10 of the speaker 1 deviates from the direction of the listener will be
described. FIG. 4 is a directional frequency characteristic of the speaker device showing the first
embodiment. The horizontal axis shows the frequency of the reproduced sound (unit hertz, Hz),
and the vertical axis shows the sound pressure level (unit decibel, dB), with the central azimuth 0
° of the reference axis 10 and the azimuth inclined 10 ° and 30 ° from it The characteristics
of are indicated by a solid line, an alternate long and short dash line, and a broken line,
respectively. According to FIG. 4, in the azimuth inclined at 0 ° to 10 ° and 30 ° at the central
azimuth of the reference axis 10, the sound pressure level of the middle to high frequency range
from 600 Hz to 20 KHz is compared when the central azimuth is at 0 °. It can be seen that it has
gradually deteriorated. For example, when compared at sound pressure levels at a frequency of 8
kHz, a decrease of about 3 dB at 10 ° inclination and about 6 dB at 30 ° inclination can be
seen with respect to the central azimuth 0 ° of the reference axis 10. From this, it is understood
that by making the direction of the reference axis 10 of the speaker 1 as close as possible to the
direction of the listener, the flatter sound pressure frequency characteristics will be approached,
and better sound quality can be obtained for the listener.
[0022]
As described above, according to the first embodiment, the speaker 1 is attached to the frame 3
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rotating with the speaker base 11 as the rotation reference surface 16 so as to be inclined at a
predetermined angle with the rotation reference surface 16. The rotation makes it possible to
change the orientation of the reference axis 10 of the loudspeaker 1 and to orient the reference
axis 10 in the direction of the listener. As a result, it is possible to suppress the sound quality
deterioration associated with the misorientation of the reference axis 10, and a speaker device
with excellent sound quality can be obtained. Further, since the frame 3 for holding the speaker
1 also serves as a rotation surface at the time of rotation, the structure of the rotation mechanism
can be easily configured.
[0023]
Second Embodiment FIG. 5 is a cross-sectional view of a speaker device showing a second
embodiment. The difference between this embodiment 2 and the embodiment 1 shown in FIG. 1
is that the flange portion 14 provided on the frame 3 of the speaker 1 is provided on the gasket
4, and the other structure is different. Is the same as in FIG.
[0024]
In FIG. 5, a flange portion 14 for forming a rotational surface at the time of rotation is provided
on a gasket 4 as a rotational surface forming means. Further, the flange portion 14 is held by the
speaker base 11 as a rotation reference surface forming means forming the rotation reference
surface 16 and the concave gap 13 formed by the rotation regulating cover 12. The gasket 4
rotates about a rotation axis 15 perpendicular to the rotation reference surface 16. The speaker
1 is fixed to the inclined mounting surface of the gasket 4 via the frame 3 so that the reference
axis 10 of the diaphragm 2 is inclined by 10 ° with respect to the rotation axis 15. Therefore, as
the gasket 4 rotates, the orientation of the reference axis 10 of the speaker 1 changes so as to
draw a circle about the rotation axis 15.
[0025]
FIG. 6 is a cross-sectional view at the time of rotation of the speaker device showing the second
embodiment. In FIG. 6, the flange portion 14 of the gasket 4 is regulated by the speaker base 11
and the rotation regulating cover 12, and rotates around the rotating shaft 15. FIG. 6A is a crosssectional view in the case where the rotation angle is 0 °. FIG. 6 (2) is a cross-sectional view in
the case of rotating 90 degrees clockwise about the rotation shaft 15. As shown in FIG. In this
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case, although the rotary shaft 15 and the reference shaft 10 appear to coincide with each other
in the cross sectional view, the reference shaft 10 is inclined by 10 ° toward the front side of
the paper surface while the rotary shaft 15 is parallel to the paper surface. Become. FIG. 6 (3) is a
cross-sectional view in a case where the rotation angle is further 180 ° by further rotating 90 °
around the rotation shaft 15.
[0026]
In the first embodiment, the gasket 4 and the cushion 5 are fixed to the rotation control cover 12
and did not rotate. However, in the second embodiment, these also rotate together with the
speaker 1.
[0027]
As described above, according to the second embodiment, the speaker 1 is attached to the gasket
4 rotating with the speaker base 11 as the rotation reference surface 16 so as to be inclined at a
predetermined angle with the rotation reference surface 16. The rotation makes it possible to
change the orientation of the reference axis 10 of the loudspeaker 1 and to orient the reference
axis 10 in the direction of the listener.
As a result, it is possible to suppress the sound quality deterioration associated with the
misorientation of the reference axis 10, and a speaker device with excellent sound quality can be
obtained. Further, since the gasket 4 attached to the speaker 1 also serves as a rotating surface at
the time of rotation, the structure of the gasket 4 can be mainly used to constitute a rotating
mechanism.
[0028]
Although the flange portion 14 is provided on the frame 3 or the gasket 4 in the first
embodiment or the second embodiment described above, the flange portion 14 may be provided
on the waterproof cover 7 (not shown). . As described above, even if the flange portion 14
serving as the rotation surface is provided on any of the frame 3, the gasket 4, and the
waterproof cover 7 attached to the speaker 1, the rotation mechanism can be configured.
Freedom is increased.
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[0029]
Third Embodiment Next, another structural example will be shown as the third embodiment.
Here, in FIG. 1 of the first embodiment, an example in which the gasket 4 and the cushion 5 fixed
to the rotation control cover 12 are fixed to the speaker base 11 is shown. FIG. 7 is a crosssectional view of the speaker device showing the third embodiment. On the circumference of the
speaker base 11 as a rotation reference surface forming means having a large diameter, a gasket
4 and a cushion 5 having a large diameter are fixed. The sound wave generated from the speaker
1 is emitted around the reference axis 10, but since the reference axis 10 is inclined with respect
to the rotation axis 15, the gasket 4 and the cushion 5 rotate around the rotation axis 15. When
it is fixed to the regulating cover 12, a part of the sound wave is shielded and disturbed by the
gasket 4 or the cushion 5, and the frequency characteristic of the reproduced sound may be
deteriorated, and the sound quality may be deteriorated. According to the third embodiment, the
gasket 4 and the cushion 5 can be installed outside the range where the sound wave is emitted,
and the sound quality deterioration due to the shielding as described above can be prevented.
[0030]
As described above, according to the third embodiment, since the shielding of the sound wave
generated from the speaker 1 by the gasket 4 or the cushion 5 is eliminated, the sound quality
deterioration due to the shielding can be prevented, and the sound quality can be improved.
[0031]
In the third embodiment, an example in which the rotation surface forming means of the speaker
1 is the frame 3 is shown, but the rotation surface forming means may be the waterproof cover 7
(not shown), and in this case as well. An effect is obtained.
[0032]
Fourth Embodiment
Next, an example provided with fixing means for fixing after rotating the speaker 1 is shown.
FIG. 8 is a perspective view of a speaker device showing a fourth embodiment. FIG. 9 is a crosssectional view thereof. In FIGS. 8 and 9, reference numeral 17 denotes an anti-rotation lock
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structure provided on the rotation control cover 12, and the other structure is the same as that of
FIG. 1 in the first embodiment. The rotation restricting cover 12 has a shape including a screw
hole, and a U-shaped slit surrounding the screw hole is inserted to provide a rotation lock
structure 17 which is deformed by screwing.
[0033]
FIG. 9 (2) is an enlarged view of a portion surrounded by a dashed dotted line circle in FIG. 9 (1),
and shows the operation of the rotation stop locking structure 17. As shown in FIG. When the
speaker base 11 and the rotation restricting cover 12 are screwed to the inner panel 8 with the
screw 9, the rotation locking structure 17 is pressed and deformed by the screw 9, and the flange
portion 14 of the frame 3 is the speaker base 11. It is inserted between and fixed so as not to
rotate.
[0034]
As described above, according to the fourth embodiment, after the orientation of the reference
shaft 10 is properly adjusted by the rotation of the speaker 1, the anti-rotation lock structure 17
provided on the rotation control cover 12 is tightened with the screw 9. Thus, the rotation of the
speaker 1 can be fixed. As a result, it is possible to prevent the sound quality from being
deteriorated due to the speaker 1 rattling or the rotational angle shifting due to the vibration or
the shock being applied when the vehicle is traveling or the like.
[0035]
Embodiment 5 Next, another example provided with fixing means is shown. FIG. 10 is a crosssectional view of the speaker device showing the fifth embodiment. In FIG. 10 (1), reference
numeral 18 denotes a stepped portion provided on the flange portion 14 of the frame 3. The
other structure is the same as that of FIG. 1 in the first embodiment. On the inner diameter side
of the flange portion 14 of the frame 3, a disc-like step portion 18 having a diameter larger than
the hole opened in the inner panel 8 of the door is provided. Further, in the speaker base 11, a
hole smaller than the outer diameter of the flange portion 14 of the frame 3 and larger than the
outer diameter of the step portion 18 is opened. Furthermore, when the speaker base 11 is
attached to the inner panel 8, the upper surface of the step portion 18 of the frame 3 is set to be
higher by about 0 mm to 1 mm in the height direction than the attachment surface of the
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speaker base 11 It has become. FIG. 10 (2) is an enlarged view of a portion surrounded by a
dashed dotted line circle in FIG. 10 (1). As shown in this figure, when the speaker base 11 is
attached to the inner panel 8 with the screw 9, the step portion 18 of the frame 3 is inserted
between the inner panel 8 and the rotation regulating cover 12 and the frame 3 rotates. Not to
be fixed.
[0036]
As described above, according to the fifth embodiment, the rotation of the speaker 1 is fixed by
using the step portion 18 of the frame 3 even without the anti-rotation locking structure portion
17 as described in the fourth embodiment. can do. As a result, it is possible to prevent the sound
quality from being deteriorated due to the speaker 1 rattling or the rotational angle shifting due
to the vibration or the shock being applied when the vehicle is traveling or the like.
[0037]
In the fourth and fifth embodiments, although the example in which the rotating surface forming
means of the speaker 1 is the frame 3 is shown, the rotating surface forming means may be the
gasket 4 or the waterproof cover 7 (shown in FIG. The same effect can be obtained in this case as
well.
[0038]
Sixth Embodiment
Next, as a sixth embodiment, an example provided with a rotational drive means for rotationally
driving the speaker 1 is shown. FIG. 11 is a front view of the speaker device showing the sixth
embodiment. In FIG. 11, a gear 19 is formed on the outer periphery of the gasket 4 which is a
means for forming a rotational surface of the speaker 1, and this is meshed with the pinion gear
20. The pinion gear 20 meshes with a worm gear 22 having a helical gear attached to a rotary
shaft which is a drive shaft of a drive motor 21 as a rotary drive means. The detailed
configuration of the other speaker 1 is the same as that of FIG. 5 of the second embodiment.
When the drive motor 21 rotates, its rotational force is transmitted to the gear 19 formed on the
outer periphery of the gasket 4 fixed to the speaker 1 through the worm gear 22 and the pinion
gear 20, and the speaker 1 rotates its rotation shaft 15 It will rotate to the center.
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12
[0039]
FIG. 12 is a cross-sectional view showing a configuration example in which the speaker device
provided with the rotation mechanism shown in FIG. 11 is attached to a vehicle door. In FIG. 12
(1), the speaker 1 is attached by fixing the speaker base 11 to an inner panel 8 which is an inner
member of a vehicle door with a screw 9. Further, the interior material 24 of the door is attached
to the door panel 23 so as to cover the speaker 1 and the inner panel 8. The interior material 24
has a grille opening 25 formed of a large number of holes for radiating the sound generated from
the speaker 1 into the vehicle interior. A cylindrical rib 26 is formed inside the grille opening 25,
and a fine uneven portion is formed on the outer periphery of the cylindrical portion of the rib
26. On the other hand, a fine asperity is also formed on the inner periphery of the cylindrical
portion of the gasket 4 as an airtight holding means for maintaining the airtightness of the front
and rear spaces of the diaphragm 2 of the speaker 1. By fitting with the formed concavo-convex
part, a slit part 27 which is a maze-like gap is formed. By having such a structure, the airtightness
of the space before and after the diaphragm 2 is maintained regardless of the presence or
absence of the rotation of the speaker 1, and the sound quality deterioration of the reproduced
sound due to the interference of the sound waves generated before and after the diaphragm 2 It
can be prevented.
[0040]
FIG. 12 (2) shows an enlarged cross-sectional view of the periphery of the slit portion 27
surrounded by an alternate long and short dash line circle in FIG. 12 (1). The rib 26 and the
gasket 4 are fitted to each other while maintaining a gap of about 1 mm in the slit 27. Generally,
the acoustic resistance of the space 27 is in inverse proportion to the cube of the space size, so
the space size is set small at 1 mm or less, so that sufficient air tightness is maintained. In
general, since the acoustic resistance of the slit 27 increases in proportion to the length of the
overlap of the concavo-convex part, air tightness can be achieved when the overlap of the
concavo-convex part of the rib 26 and the gasket 4 is doubled or triple. Can be further improved.
When the speaker 1 rotates, the gasket 4 and the rib 26 maintain a gap in the slit 27. Therefore,
the gasket 4 rotates the outer periphery of the rib 26 of the interior material 24 while
maintaining the airtightness. It will be done.
[0041]
As described above, according to the sixth embodiment, since the rotation of the speaker 1 can
be electrically driven by the drive motor 21, the listener can easily adjust the orientation of the
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reference axis 10 of the speaker 1. Become.
[0042]
Further, according to the sixth embodiment, since the airtight holding means for holding the
airtightness of the front and rear spaces of the diaphragm 2 by the fitting of the concavo-convex
part is provided, regardless of the presence or absence of the rotation of the speaker 1, The
airtightness of the front and back space is maintained, and the sound quality deterioration of the
reproduced sound due to the interference of the sound waves generated before and after the
diaphragm 2 can be prevented.
Moreover, the need for providing the cushion 5 is eliminated, and the number of parts can be
reduced.
[0043]
In the sixth embodiment, although an example using the electric drive motor 21 as the rotation
drive means is shown, a manual rotation drive means such as a rotation lever for manually
rotating the drive shaft to which the worm gear 22 is attached is used. The same effect can be
obtained in this case.
[0044]
Embodiment 7
Next, as the seventh embodiment, in the speaker apparatus provided with the rotational driving
means of the sixth embodiment, the speaker position detecting means for detecting the listener
position and the speaker position based on the detected listener position are further provided.
The example provided with the judgment means which judges a rotation angle, and the control
means which drive-controls a rotation drive means based on the judged rotation angle is shown.
[0045]
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14
Seventh Embodiment FIG. 13 is a system configuration diagram of a speaker apparatus showing
a seventh embodiment. Left and right audio signals generated from an audio unit 28 such as a
stereo radio are amplified by an amplifier 29 and input to the input terminals 6 of the left
speaker 1a and the right speaker 1b respectively attached to the left and right doors of the
vehicle. Be regenerated. In each of the left and right speakers 1a and 1b, a drive motor 21 as a
rotation drive means shown in FIG. 11 of the sixth embodiment is incorporated. A motor control
unit 30 is connected to the left and right drive motors 21 as control means for controlling the
rotation of the drive motors 21 according to drive signals. The motor control unit 30 is
connected to a controller 31 for manually inputting the rotation angles of the left and right
speakers 1a and 1b. Furthermore, a determination unit 33 is connected which determines the
rotation angle of the left and right speakers 1a and 1b based on the position of the occupant
detected by the sensor 32 as the listener position detection means. Here, the sensor 32 includes
a pressure sensor installed under each seat to detect the presence or absence of an occupant, and
a position sensor installed on a slider of each seat to detect a slide position in the front-rear
direction.
[0046]
Next, the operation will be described. Here, an operation in the case where two crew members
who are listeners sit respectively at the driver's seat (right seat) and the front passenger seat (left
seat) of the vehicle will be described. The values of the rotation angles of the speakers 1a and 1b
are such that the rotation angle in the clockwise direction is a positive value and the rotation
angle in the counterclockwise direction is a negative value when the speakers 1a and 1b are
viewed from the direction of the rotation shaft 15 in front. Further, it is assumed that the
reference shaft 10 at a rotation angle of 0 ° is inclined at an angle of 10 ° right above the
rotation shaft 15.
[0047]
In FIG. 13, the sensor 32 detects that the occupant is in both the driver's seat and the front
passenger's seat and that the slide positions of both the seats are forward, and transmits a
detection signal to the determination unit 33. The judgment unit 33 that has received this
indicates that the left speaker 1a is at -30 ° and the right speaker 1b as a rotation angle such
that the orientation of the reference axis 10 of the left and right speakers 1a and 1b approaches
in the direction of the occupant in both seats. Determines that + 30 ° is optimum, and transmits
this rotation angle information to the motor control unit 30. In response to this, the motor
control unit 30 transmits a rotation drive signal corresponding to each rotation angle to the left
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and right drive motors 21 incorporated in the left and right speakers 1a and 1b. As a result, the
rotary shafts of the left and right drive motors 21 rotate respectively, and the rotational force is
applied to the gears 19 of the respective gaskets 4 fixed to the left and right speakers 1 a and 1 b
via the worm gears 22 and the pinion gears 20. As a result, the left and right speakers 1a and 1b
are rotated. In this way, the reference axis 10 of each of the left and right speakers 1a, 1b will
stop at an optimum orientation for the occupants in both seats.
[0048]
In addition, after the completion of the automatic control operation as described above, the
occupant can operate the controller 31 to finely adjust the orientations of the reference axes 10
of the left and right speakers 1a and 1b. By operating a button, a lever, or the like included in the
controller 31, rotation angle information of the left and right speakers 1 a and 1 b is transmitted
to the motor control unit 30. Thereafter, through the same operation process as described above,
the left and right speakers 1a and 1b are rotated, and the orientation of each reference axis 10 is
changed, whereby fine adjustment is performed. In this operation, the position of the ear that
listens to the sound is different due to the difference in physical constitution of the seat height
individual passenger, and along with this, the direction of the reference axis 10 of the left and
right speakers 1a and 1b is slightly different from the optimum direction for the passenger. It is
effective as a fine adjustment when it is misplaced.
[0049]
FIG. 14 is a table showing an example of the relationship between the occupant seating position
of the vehicle and the optimum rotation angles of the left and right speakers 1a and 1b. For
example, when the seat position of the seat is forward and the occupant is seated only on the
driver's seat (right side), the left speaker 1a is rotated by -15 ° and the right speaker 1b is
rotated by + 30 °. . Similarly, when the occupant is seated on both the driver's seat (right side)
and the front passenger seat (left side) with the front seat position of the seat, the rotation angles
of the left and right speakers 1a and 1b are -30 ° and + 30 °, respectively. Is the best.
Furthermore, when the seat position of the seat is the rear and the occupant is seated on both left
and right, -90 ° and + 90 ° are optimum.
[0050]
The relationship between the seating position of the occupant and the optimal rotation angle of
the left and right speakers 1a and 1b slightly changes depending on the type of vehicle and the
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mounting position of the left and right speakers 1a and 1b, so Optimal control can be performed
by storing the corresponding optimum value in the determination unit 33 in advance.
[0051]
As described above, according to the seventh embodiment, the orientation of the optimal
reference axis 10 of the left and right speakers 1a and 1b can be automatically controlled in
accordance with the number of occupants of the vehicle and the seating position. Automotive
sound system can be easily realized.
In addition, by adopting a system combining the controller 31 for manually operating the
rotation angles of the left and right speakers 1a and 1b, the listener can easily finely adjust the
direction of the reference axis 10 of the speakers 1a and 1b. The acoustic space can be obtained
according to the installation environment and the physique and preference of the listener.
[0052]
In the sixth and seventh embodiments, the rotating surface forming means of the speaker 1 is the
gasket 4 and the gear 19 is formed on the outer periphery thereof. However, the rotating surface
forming means is the frame 3 or waterproof. The cover 7 may be formed with gears 19 on the
outer periphery thereof (not shown), and the same effect can be obtained in this case as well.
[0053]
As described above, since the present invention is configured as described above, the following
effects can be obtained.
[0054]
According to the speaker device of the present invention, the rotation reference surface forming
means forming the rotation reference surface, the rotation surface forming means forming the
rotation surface rotatable along the rotation reference surface, and the predetermined angle
inclination with the rotation reference surface And the reference axis orientation of the speaker
is made variable by the rotation of the rotation surface forming means, so that the reference axis
orientation of the speaker is in the direction of the listener by the rotation of the rotation surface
forming means. This can be matched, and by suppressing the sound quality deterioration
associated with the deviation of the reference axis orientation, there is an effect that a speaker
device with excellent sound quality can be obtained.
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[0055]
According to the speaker device of the present invention, the rotating surface forming means is
either the frame, the gasket or the waterproof cover, so that the rotating surface can be formed
by the frame, the gasket or the waterproof cover when the speaker is rotated. This has the effect
of increasing the degree of freedom in structural design of the rotation mechanism.
[0056]
According to the speaker device according to the present invention, since the structure for
shielding the sound wave generated from the speaker is disposed at a position separated from
the reference axis of the speaker by a predetermined distance or more, sound quality
deterioration due to shielding can be prevented. The effect is that it is possible to improve
[0057]
According to the speaker device of the present invention, the fixing means for fixing the rotation
of the rotational surface forming means is provided, so that the sound quality deterioration due
to the deviation of the rotational angle of the speaker can be prevented.
[0058]
According to the speaker device according to the present invention, since the airtight holding
means for holding the airtightness of the space before and after the speaker is provided by the
fitting of the concavo-convex portion, the sound quality deterioration due to the interference of
the sound waves generated from the front and back of the speaker is prevented. It has the effect
of being able to
[0059]
According to the speaker device of the present invention, since the rotary drive means for
rotationally driving the rotary surface forming means is provided, there is an effect that the
listener can easily adjust the reference axis orientation of the speaker.
[0060]
According to the speaker device of the present invention, the listener position detecting means
for detecting the listener position, the judging means for determining the speaker rotation angle
based on the detected listener position, and the determined rotation angle. Since the control
means for driving and controlling the rotational driving means is provided, the optimum
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reference axis orientation of the speaker can be automatically controlled according to the
number of people and the sitting position of the listener, and a system excellent in acoustic
characteristics is obtained. Have the effect of
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