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JP2009260524

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2009260524
An object of the present invention is to provide a speaker device that is advantageous in
effectively preventing sound leakage and improving sound quality. A speaker device includes a
main body (12) and left and right side portions (13). The left and right side portions 13 are
configured to include a speaker 14 and an outer cover 24 covering the speaker 14. Each speaker
14 includes a speaker unit 16 and a speaker box 18. The speaker box 18 accommodates the
woofer speaker unit 26 and is configured to include a rear wall 30, a side wall 32, and a front
wall 34. The rear wall 30 covers the rear of the woofer speaker unit 26, and the side wall 32
stands from the periphery of the rear wall 30 and extends along the outer edge of the woofer
speaker unit 26 outside the woofer speaker unit 26. doing. In the side wall 32, a plurality of
openings 36 communicating the inside and the outside of the speaker box 14 are formed along
the entire circumference of the side wall 32. [Selected figure] Figure 7
Speaker device
[0001]
The present invention relates to a speaker device.
[0002]
2. Description of the Related Art Conventionally, an audio device for enjoying music in a vehicle
compartment of a car has been provided.
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This audio apparatus has a radio tuner, a tape player, a CD player and the like, and is configured
to output sound by supplying an audio signal from them to a speaker incorporated in a front
panel, a door, a rear tray and the like in the vehicle interior. It is done. However, the distance
between the speakers and the left and right ears of the user (driver and passenger) sitting on
each seat in the vehicle compartment is different, so that a sense of stereo can be obtained at the
time of sound reproduction. There is a disadvantage that it is not easy, and there is also a
disadvantage in enjoying a good sound quality due to the influence of road noise generated as
the vehicle travels. Then, various so-called headrests with built-in speakers have been proposed
in which a pair of left and right speakers is built in each of the headrests attached to the upper
part of each seat in the vehicle compartment (see Patent Document 1). In this headrest, since the
distance between the pair of left and right speakers and the user's left and right ears can be set in
a well-balanced manner, better sound quality and a sense of stereo feeling can be obtained
compared to the case of using the speaker incorporated in the vehicle interior. It is possible to
play back the voice you got. Patent Document 1: Japanese Patent Application Laid-Open No.
2005-159913
[0003]
However, in the headrest described above, when part of the sound generated from one headrest
is transmitted to the side or the back of the headrest, it can be heard by the other seat seated on
the next seat or the seat behind the seat. There are disadvantages such as adversely affecting the
listening of voices by other users, or making other users uncomfortable. Further, among the
frequency characteristics of the reproduced sound, the sound pressure level in the low band
tends to decrease as compared to other sound ranges, and there is a limit in improving the sound
quality. The present invention has been made in view of such circumstances, and an object
thereof is to provide a speaker device that is advantageous in improving sound quality while
effectively preventing sound leakage.
[0004]
In order to achieve the above-mentioned object, the speaker device of the present invention
comprises a main body which is extended to the left and right to be applied to the back of the
head of the user, and left and right side parts connected in series to left and right ends of the
main body. The left and right sides include a speaker supported by the main body and an outer
shell covering the speaker, and the speaker has a speaker unit and a speaker box accommodating
the speaker unit. In the speaker, the central axis of the speaker unit is arranged to be inclined
with respect to the left and right extension direction of the main body such that the back of the
head points to the left and right ears of the user abutted on the main body The box has a rear
wall which covers the rear of the diaphragm, and a side wall which is erected forward from the
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rear wall and extends along the outer edge of the diaphragm outside the diaphragm, A plurality
of openings are formed in the side wall which communicate the inside and the outside of the car
box and prevent sound leakage to the periphery of the speaker unit and secure the sound
pressure level in the low range of the sound reproduced by the speaker unit. ing.
[0005]
According to the present invention, the speaker is disposed close to the user's ear, and a plurality
of openings communicating between the inside and the outside of the speaker box are formed on
the side wall, so that the sound leakage of the speaker is effectively achieved. This is
advantageous in securing the sound pressure level in the low range to improve the sound quality
while preventing the noise.
[0006]
Next, an embodiment in which the present invention is applied to the driver's seat of a car will be
described with reference to the drawings.
FIG. 1 is a front view of the speaker device according to the present embodiment, FIG. 2 is a view
taken in the direction of arrow A in FIG. 1, and FIG. 3 is a view taken in the direction of arrow B
in FIG.
4 is a perspective view of the speaker device according to the present embodiment as viewed
from the front, FIG. 5 is a view as viewed from the arrow A in FIG. 4, FIG. 6 is a view as viewed
from the arrow B in FIG. It is. 8 (A) is a rear view of the speaker box, (B) is a view on arrow B in
(A), (C) is a view on arrow C in (A), and (D) is a view on arrow D in (A) (E) is an E arrow view of
(A). FIG. 9 is a view showing the positional relationship between the headrest 10 and the head of
the user.
[0007]
The headrest 10 is comprised including the main body 12 and the side part 13 on either side, as
shown to FIGS. 1-4. The speaker device of the present invention is incorporated in this headrest
10.
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[0008]
(Main Body 12) As shown in FIG. 1 to FIG. 3 and FIG. 9, the main body 12 is the back of the
user's head, that is, the place where the back of the driver sitting in the driver's seat is applied. As
shown in FIGS. 4 to 6, the main body 12 is configured to include a support rod 4, a frame 20, a
pad 22 and an outer skin 24. The upper part of the support rod 4 is embedded in the main body
12, and the lower two parts are protruded downward from the main body 12. The lower portion
of the support rod 4 is detachably mounted to the upper portion of the seat back 2, and the main
body 12 is disposed above the seat back 2 with the support rod 4 mounted on the upper portion
of the seat back 2. The frame 20 is configured by the upper portion of the support rod 4 and the
like in the present embodiment. The pad 22 is attached to the frame 20 and disposed. For the
pad 22, for example, a cushioning material such as urethane foam is used. Furthermore, in the
present embodiment, a stay 23 extending in the left-right direction at the lower part of the main
body 12 is attached to the support rod 4. The stay 23 is disposed so as to protrude laterally from
the left and right ends of the main body 12. The outer cover 24 covers the frame 20 and the pad
22 and the portions excluding the left and right ends of the stay 23, and leather, cloth or the like
is used. In addition, various structures conventionally known can be employ | adopted as
structures, such as the support rod 4, the flame | frame 20, the pad 22, and the outer skin 24.
FIG.
[0009]
(Left and right side parts 13) As shown in FIG. 4, the left and right side parts 13 are continuously
provided to the left and right end parts of the main body 12. The left and right side portions 13
are configured to include a speaker 14 and an outer cover 24 covering the speaker 14. The
speaker 14 is connected to the support rod 4 and the frame 20 and disposed. In the present
embodiment, the speaker 14 is connected to the support rod 4 via the stay 23. Therefore, the
speaker 14 is disposed at a position close to the user's ear with the back of the head applied to
the main body 12. A common skin 24 is used for the skin 24 of the main body 12 and the skin
24 of the left and right side portions 13. As shown in FIG. 2, when viewed from above, the main
body 12 and the left and right side portions 13 linearly extend in the left-right direction with the
same thickness in the front-rear direction, and the left and right side portions 13 The rear
portion of the is formed by an inclined surface 1302 that gradually inclines forward toward the
left and right outer sides.
[0010]
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(Speaker Unit 16) The speaker device is configured to include left and right speakers 14, and
each speaker 14 includes a speaker unit 16 and a speaker box 18. As shown in FIG. 4, the
speaker unit 16 is configured to include a woofer speaker unit 26 for reproducing low-range
audio, and a tweeter speaker unit 28 for reproducing high-range audio. . The woofer speaker unit
26 is configured to include a drive unit (not shown), a diaphragm 2602, and a speaker frame
2604 that supports the drive unit and the diaphragm 2602. The tweeter speaker unit 28 includes
a drive unit (not shown), a diaphragm 2802, and a speaker frame 2804 supporting the drive unit
and the diaphragm 2802. The drive units vibrate the diaphragms 2602 and 2802 based on audio
signals supplied from an audio device (not shown). The diaphragms 2602 and 2802 output
sound by being vibrated by the drive unit. In the present embodiment, the audio signal supplied
from the audio device is separated into two audio signals: an audio signal corresponding to the
low band and an audio signal corresponding to the high band, and the speaker unit for the
woofer A network (filter circuit) to be supplied to the drive unit 26 and the drive unit of the
speaker unit 28 for tweeter is provided in front of the drive unit of each speaker unit 26, 28.
[0011]
(Speaker Box 18) As shown in FIGS. 4 to 7, the speaker box 18 accommodates the woofer
speaker unit 26, and constitutes a so-called enclosure. As shown in FIGS. 7 and 8A to 8E, the
speaker box 18 is configured to include a back wall 30, a side wall 32, and a front wall 34. The
rear wall 30 covers the rear of the woofer speaker unit 26 and is formed with a contour larger
than that of the woofer speaker unit 26. The side wall 32 is erected from the periphery of the
rear wall 30 and extends along the outer edge of the woofer speaker unit 26 outside the woofer
speaker unit 26. The side wall 32 is formed with a plurality of openings 36 communicating the
inside and the outside of the speaker box 14 (that is, the openings 36 penetrating the side wall
32) along the entire circumference of the side wall 32. The opening 36 is formed in an elongated
shape having a length having a large dimension compared to the width, and the longitudinal
direction of the opening 36 is provided in the extending direction of the side wall 32. The width
of the opening 36 is about 2 mm to 4 mm, and the opening 36 is provided at a position near the
rear wall 30 of the side wall 32. By forming such an opening 36, the sound pressure level in the
low range is secured while effectively preventing the sound leakage of the woofer speaker unit
26 as described later. The front wall 34 is connected to the front end of the side wall 32 and, as
shown in FIG. 4, extends semicircularly along the outer periphery of the woofer speaker unit 26.
In the front wall 34, an opening for sound emission is formed to allow the diaphragm 2602 of
the woofer speaker unit 26 to face forward. In addition, a mesh for protection that covers the
opening for sound emission of the front wall 34 is optionally attached to the front wall 34.
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[0012]
(Arrangement of Speaker Unit 16 and Speaker Box 18) As shown in FIG. 4, FIG. 5, and FIG. 7, the
left and right speaker boxes 18 are respectively connected to the left and right sides of the frame
20. The left and right woofer speaker units 26 are respectively accommodated in the left and
right speaker boxes 18. More specifically, the speaker frame 2604 of the woofer speaker unit 26
is attached to the front wall 34 of the speaker box 18 using a screw or the like, whereby the
woofer speaker unit 26 is accommodated in the speaker box 18. As shown in FIGS. 4 and 5, the
speaker frames 2804 of the left and right tweeter speaker units 28 are attached to the left and
right speaker boxes 18 via the attachment members 29, respectively. Thus, the tweeter speaker
unit 28 is disposed in front of the woofer speaker unit 26.
[0013]
In the present embodiment, as shown in FIGS. 5 and 9, the woofer speaker unit 26 and the
tweeter speaker unit 28 have central axes L1 and L2 of the woofer speaker unit 26 and the
tweeter speaker unit 28. The outer portions of the diaphragms 2602 2802 away from the main
body 12 are inclined to be located forward of the inner portions near the main body 12 so as to
point to the left and right ears. As shown in FIG. 5, the left and right side portions 13 are located
inside the outline of the seat back 2 as viewed from above. Further, as shown in FIG. 6, when
viewed from the side, the left and right side portions 13 are located inside the outline of the main
body 12. Further, the inner end of each speaker 14 located closer to the main body 12 is located
behind the left and right ends of the main body 12. More specifically, the inner end of the
speaker box 18 of the woofer speaker unit 26 is located behind the left and right ends of the
main body 12. Then, as shown in FIG. 4, when viewed from the front, the inner end of each
speaker 14 located closer to the main body 12 is located inside the outline of the main body 12.
More specifically, the inner end of the speaker box 18 of the woofer speaker unit 26 is located
inside the contour of the body 12. As shown in FIG. 5, a gap S is generated between the left and
right side portions 13 and the front surface of the speaker box 18 inside the outer cover 24.
However, this gap may be left as it is, or It is optional to fill the gap with a filter or the like
through which voice can pass.
[0014]
Next, the operation and effect will be described. FIG. 10 is a view showing measurement results
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of frequency characteristics of the speaker device incorporated in the headrest 10 of the present
embodiment. The following three points were used to measure the frequency characteristics. 1) A
location on the central axis L2 in front of the woofer speaker unit 26 (hereinafter referred to as a
front location for convenience of description). 2) A location that is 90 degrees to the central axis
L2 on the side of the woofer speaker unit 26 (hereinafter referred to as a location of 90 degrees
for convenience of explanation). 3) A point on the central axis L2 at the rear of the woofer
speaker unit 26 (hereinafter referred to as a point of 180 degrees for convenience of
description). The distances from the center of the diaphragm 2602 to the above three points are
the same, and this same distance is the distance from the center of the diaphragm 2602 to the
ear in a state where the head of the headrest 10 is held against the head. Is equivalent to In the
present embodiment, the same distance D is 15 cm.
[0015]
As is clear from FIG. 10, in the band of 100 Hz or less, the sound pressure level at a 90 degree
position is approximately 20 dB or more lower than the sound pressure level at the front portion.
Also, in the band of 100 Hz or less, the sound pressure level at the location of 180 degrees is
reduced by 8 dB or more compared to the sound pressure level at the front location. That is, the
sound output from the woofer speaker unit 26 and output to the front of the speaker box 18 and
the sound output to the side through the opening 36 of the side wall 32 of the speaker box 18
mutually cancel each other. A part of the sound generated from the headrest 10 is prevented
from being transmitted to the side or the back of the headrest 10, and sound leakage around the
speaker 14 is prevented. Since the tweeter speaker unit 28 has a high frequency component of
the sound to be reproduced, the directivity is narrow. Therefore, sound leakage to the
surroundings by the tweeter speaker unit 28 can be ignored.
[0016]
Further, as shown in FIG. 10, the sound pressure level at the front portion is substantially flat in
the band of 100 Hz to 500 Hz, and the sound pressure level in the low range is sufficiently
secured. That is, by providing the opening 36 of the side wall 32 of the speaker box 18, the
sound pressure level in the low band can be secured, which is advantageous for reproducing the
sound in the low band favorably.
[0017]
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FIG. 11 is a diagram showing measurement results of frequency characteristics of the speaker
device of the comparative example. The speaker device of the comparative example is configured
the same as the headrest 10 of the embodiment except that the opening 36 is not formed in the
speaker box 18. Moreover, in the measurement of the frequency characteristic of FIG.
[0018]
As apparent from FIG. 11, in the band of 100 Hz or less, the sound pressure level at the 90
degree position is only about 2 dB lower than the sound pressure level at the front portion, and
the sound pressure level at the 180 degree portion Is about 8 dB lower than the sound pressure
level at the front. Therefore, the sound pressure level at the 90-degree position is hardly reduced
with respect to the sound pressure level at the front portion, and sound leakage from the speaker
14 to the periphery is significantly generated.
[0019]
FIG. 12 is a diagram comparing measurement results of frequency characteristics at locations in
front of the speaker device of the embodiment and the speaker device of the comparative
example. As shown in FIG. 12, in the comparative example, the sound pressure level in the band
of 200 Hz or less is sharply lowered with respect to the band higher than 200 Hz, and the sound
pressure level in the low band is lowered compared to the embodiment. ing. Specifically, the
sound pressure level of the comparative example is 8 dB lower than the sound pressure level of
the embodiment at 50 Hz to 100 Hz. On the other hand, in the speaker device according to the
present embodiment, the f0 (minimum resonance frequency) of the speaker 14 can be made
lower than that of the comparative example. Therefore, the sound quality of sound output by
realizing a flatter frequency characteristic. It is advantageous to improve the
[0020]
As described above, according to the present embodiment, the speaker 14 is disposed at a
position close to the user's ear in which the back of the head is placed on the main body 12, and
the inside and the outside of the speaker box 18 are communicated. Since the plurality of
openings 36 are formed in the side wall 32, sound leakage of the speaker 14 can be effectively
prevented, and the sound pressure level in the low range can be secured to improve the sound
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quality. In addition, since a plurality of openings 36 are formed in the side wall 32 of the speaker
box 18 and there is no need to provide a dedicated sound leakage prevention member or the like,
the size and thickness can be reduced while achieving cost reduction. Be advantageous.
[0021]
Further, in the present embodiment, when viewed from above, the left and right side portions 13
are located inside the contour of the seat back 2, and when viewed from the side, the left and
right side portions 13 are inside the contour of the main body 12. The inner end of each of the
speakers 14 located closer to the main body 12 is located behind the left and right ends of the
main body 12. Therefore, when the user seated in the driver's seat of the car uses the seat belt,
the left and right side portions 13 do not interfere with the seat belt and become obstructed, and
the driver seated in the driver's seat rear When looking at the rear of the vehicle facing the road,
the left and right sides 13 have minimal impact on the field of view, which is advantageous in
ensuring ease of use without imposing various burdens on the user. It has become.
[0022]
Although the case where the speaker device of the present invention is applied to the driver's
seat of a car has been described in the present embodiment, the present invention relates to a
headrest of seats of various vehicles such as trains, airplanes and ships, or indoor use. It can be
widely applied to headrests of seats other than the driver's seat, such as headrests of sofas and
chairs.
[0023]
It is a front view of the speaker apparatus of this Embodiment.
It is an A arrow line view of FIG. It is B arrow line view of FIG. It is the perspective view which
looked at the speaker apparatus of this embodiment from the front. FIG. 5 is a view on arrow A of
FIG. 4; It is B arrow line view of FIG. It is C arrow line view of FIG. (A) is a rear view of the speaker
box, (B) is a view on arrow B of (A), (C) is a view on arrow C in (A), (D) is a view on arrow D in (A),
E) is an E arrow view of (A). It is a figure which shows the positional relationship of a headrest 10
and a user's head. It is a figure which shows the measurement result of the frequency
characteristic of the speaker apparatus of this Embodiment. It is a figure which shows the
measurement result of the frequency characteristic of the speaker apparatus of a comparative
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example. It is the figure which compared the measurement result of the frequency characteristic
in the location of the front of the speaker apparatus of embodiment, and the speaker apparatus
of a comparative example.
Explanation of sign
[0024]
2 ...... Seat back, 10: headrest, 12: main body, 13: side part, 14: speaker, 18: speaker box, 26:
woofer speaker unit, 30: back wall, 32: ...... Side wall, 36: opening, L2: central axis.
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