JP2009260525A - Speaker system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker system having advantages in ensuring usability without imposing burden on a user. <P>SOLUTION: A head rest 10 includes a body 12 and side portions 13 on right and left continuously provided on right and left ends of the body 12. The side portions 13 on right and left each include a speaker 14 and an outer enclosure 24 for covering the speaker 14. A speaker unit 26 for woofer and a speaker unit 28 for tweeter are disposed so that center axis lines L1, L2 thereof can be directed to right and left ears of the user whose back head abuts on the body 12. When viewed from the upper part, the side portions 13 on right and left are positioned inside a contour of a sheet back 2. Viewed from the side, the side portions 13 on right and left are positioned inside the contour of the body 12, and the inner ends of the speakers 14 positioned nearer to the body 12 are each positioned on the rearer of the right and left ends of the body 12. Viewed from the front, the inner ends of the speakers 14 positioned nearer to the body 12 are each positioned inside the contour of the body 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a speaker device.

2. Description of the Related Art Conventionally, an audio device for enjoying music in a vehicle cabin is provided.
This audio device has a radio tuner, a tape player, a CD player, and the like, and is configured to output sound by supplying sound signals from these to speakers built in the front panel, door, rear tray, etc. Has been.
However, since the distance between the left and right ears of the user (driver and passenger) sitting on each seat in the passenger compartment and the speakers varies, it is possible to obtain a stereo feeling during sound reproduction. There is a disadvantage that it is not easy, and there is a disadvantage in enjoying a sound of good sound quality due to the influence of road noise that occurs as the automobile travels.
Thus, various headrests with built-in speakers, in which a pair of left and right speakers are built in each of the headrests attached to the upper part of each seat in the vehicle interior, have been proposed (see Patent Document 1).
With this headrest, the distance between the pair of left and right speakers and the left and right ears of the user can be set in a well-balanced manner, so that the sound quality and stereo feeling are better than when using the speakers built into the passenger compartment. It is possible to reproduce the sound obtained.
JP-A-2005-159913

However, in the conventional headrest, there is a concern that when the user seated on the driver's seat uses the seat belt, the headrest portion interferes with the seat belt and becomes an obstacle.
Moreover, when the driver seated in the driver's seat turns to the rear and visually recognizes the rear of the vehicle, there is a concern that the headrest portion affects the field of view.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a speaker device that is advantageous in ensuring usability without giving various burdens to the user.

  In order to achieve the above-described object, a speaker device of the present invention includes a main body that is disposed above a seat back of a vehicle seat and that extends to the left and right and to which a user's rear head is applied, and left and right ends of the main body. And a left and right side part, and a headrest is constituted by the main body and the left and right side parts, and the left and right side parts include a speaker supported by the main body and a skin covering the speaker. The speaker has a speaker unit, and the speaker has a central axis of the main body so that a center axis of the speaker unit is directed to left and right ears of a user with the back of the head applied to the main body. The left and right side portions are arranged to be inclined with respect to the left and right extending direction, as viewed from above, and the left and right side portions are located inside the contour of the seat back. Of the body The inner end of each speaker located near the main body is located behind the left and right ends of the main body, and the inner end of each speaker located closer to the main body is viewed from the front. , Located inside the contour of the body.

  According to the present invention, the speaker can be arranged in the vicinity of the user's ear seated on the seat of the automobile, and the left and right side portions that accommodate the speaker do not interfere with the seat belt and are not obstructed. When the user turns to the rear and visually recognizes the rear of the vehicle, the left and right side portions have a minimal effect on the field of view, thus ensuring ease of use without placing various burdens on the user. It is advantageous in the above.

Next, an embodiment in which the speaker device of the present invention is applied to a driver's seat of an automobile (passenger car) will be described with reference to the drawings.
FIG. 1 is a front view of a headrest 10 in which the speaker device according to the present embodiment is incorporated, FIG. 2 is a view as seen from an arrow A in FIG. 1, and FIG. 3 is a view as seen from an arrow B in FIG.
4 is a perspective view of the headrest 10 incorporating the speaker device according to the present embodiment as viewed from the front, FIG. 5 is a view as seen from the arrow A in FIG. 4, FIG. 6 is a view as seen from the arrow B in FIG. FIG.
8A is a rear view of the speaker box, FIG. 8B is a view taken along the arrow B in FIG. 8A, FIG. 8C is a view taken along the arrow C in FIG. (E) is an E arrow view of (A).
FIG. 9 is a diagram showing the positional relationship between the headrest 10 and the user's head.

As shown in FIGS. 1 to 4, the headrest 10 includes a main body 12 and left and right side portions 13.
The speaker device of the present invention is incorporated in the headrest 10 and thus includes the headrest 10.

(Main body 12)
As shown in FIGS. 1 to 3 and 9, the main body 12 is a place where the back of the user, that is, the back of the driver sitting on the driver's seat is applied.
As shown in FIGS. 4 to 6, the main body 12 includes a support rod 4, a frame 20, a pad 22, and an outer skin 24.
The support rod 4 has an upper portion embedded in the main body 12 and two lower portions projecting downward from the main body 12.
The lower portion of the support rod 4 is detachably attached 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 being attached to the upper portion of the seat back 2.
In this embodiment, the frame 20 is configured by the upper portion of the support rod 4 and the like.
The pad 22 is attached to the frame 20 and disposed.
For the pad 22, for example, a cushion 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 skin 24 covers portions other than the left and right ends of the frame 20, the pad 22, and the stay 23, and leather or cloth is used.
In addition, conventionally well-known various structures can be employ | adopted for structures, such as the support rod 4, the flame | frame 20, the pad 22, and the outer skin | shell 24. FIG.

(Left and right side 13)
As shown in FIG. 4, the left and right side portions 13 are connected to the left and right end portions of the main body 12.
The left and right side portions 13 include a speaker 14 and an outer skin 24 that covers the speaker 14.
The speaker 14 is connected to the support rod 4 and the frame 20. 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 location close to the ear of the user whose rear head is 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 extend linearly in the left and right direction with the same thickness in the front and rear direction, and the left and right side portions 13. The rear part is formed with an inclined surface 1302 that gradually inclines forward toward the left and right outer sides.

(Speaker unit 16)
The speaker device includes 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 includes a woofer speaker unit 26 for reproducing low-frequency sound and a tweeter speaker unit 28 for reproducing high-frequency sound. .
The woofer speaker unit 26 includes a driving unit (not shown), a diaphragm 2602, and a speaker frame 2604 that supports the driving unit and the diaphragm 2602.
The tweeter speaker unit 28 includes a drive unit (not shown), a diaphragm 2802, and a speaker frame 2804 that supports the drive unit and the diaphragm 2802.
Each of the driving units vibrates the diaphragms 2602 and 2802 based on an audio signal supplied from an audio device (not shown).
The diaphragms 2602 and 2802 output sound when vibrated by the driving unit.
In this embodiment, the audio signal supplied from the audio device is separated into two audio signals, an audio signal corresponding to a low frequency and an audio signal corresponding to a high frequency, and a speaker unit for a woofer. A network (filter circuit) to be supplied to each of the 26 driving units and the driving unit of the tweeter speaker unit 28 is provided in front of the driving units of the speaker units 26 and 28.

(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 includes 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 has a larger outline than the woofer speaker unit 26.
The side wall 32 stands up 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.
In the side wall 32, a plurality of openings 36 (that is, openings 36 that penetrate the side wall 32) that communicate the inside and the outside of the speaker box 14 are formed along the entire circumference of the side wall 32.
The opening 36 is formed in an elongated shape having a length larger than the width, and the longitudinal direction thereof 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 near the rear wall 30 of the side wall 32.
By forming such an opening 36, the sound pressure level in the low frequency range is secured while effectively preventing sound leakage of the woofer speaker unit 26 as will be described later.
The front wall 34 is connected to the front end of the side wall 32, and is arranged so as to extend in a semicircular shape along the outer periphery of the woofer speaker unit 26, as shown in FIG.
The front wall 34 is formed with a sound emitting opening that allows the diaphragm 2602 of the woofer speaker unit 26 to face forward.
In addition, a protective mesh that covers the sound emission opening of the front wall 34 may be attached to the front wall 34.

(Arrangement of speaker unit 16 and speaker box 18)
As shown in FIGS. 4, 5, and 7, the left and right speaker boxes 18 are 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 with screws or the like, so that 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 respectively attached to the left and right speaker boxes 18 via attachment members 29. Thus, the tweeter speaker unit 28 is disposed in front of the woofer speaker unit 26.

In this embodiment, as shown in FIGS. 5 and 9, the woofer speaker unit 26 and the tweeter speaker unit 28 have their center axes L 1 and L 2, and the user's head whose head is applied to the main body 12. The outer portions of the diaphragms 2602 and 2802 that are separated from the main body 12 are inclined so as to be positioned in front of the inner portion close to the main body 12 so that the left and right ears are directed.
As shown in FIG. 5, the left and right side portions 13 are located inside the contour of the seat back 2 as viewed from above.
As shown in FIG. 6, the left and right side portions 13 are located inside the contour of the main body 12 when viewed from the side.
Further, the inner end portion of each speaker 14 positioned closer to the main body 12 is positioned behind the left and right end portions of the main body 12. More specifically, the inner end portion of the speaker box 18 of the woofer speaker unit 26 is located behind the left and right end portions of the main body 12.
As shown in FIG. 4, the inner end portion of each speaker 14 positioned closer to the main body 12 when viewed from the front is positioned inside the contour 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 main body 12.
As shown in FIG. 5, a gap S is formed between the left and right side portions 13 and the front surface of the speaker box 18 inside the outer skin 24. However, this gap may be left as it is, or It is optional, such as filling the gap with a filter that can pass sound.

The frequency characteristics of the speaker device incorporated in the headrest 10 of the present embodiment were measured.
FIG. 10 is a diagram showing a measurement result of frequency characteristics of the speaker device of the present embodiment.
The following three locations were measured for 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 explanation).
2) A location at 90 degrees with respect to the central axis L2 on the side of the woofer speaker unit 26 (hereinafter referred to as a 90-degree location for convenience of explanation).
3) A location on the central axis L2 behind the woofer speaker unit 26 (hereinafter referred to as a location of 180 degrees for convenience of explanation).
In the present embodiment, the distance from the center of the diaphragm 2602 to the above three locations (measurement locations) is the same distance, and this same distance is the diaphragm 2602 in a state where the head is applied to the main body 12 of the headrest 10. The dimension is set to correspond to the distance from the center to the ear. In the present embodiment, the same distance D = 15 cm.

As is apparent from FIG. 10, in the band of 100 Hz or less, the sound pressure level at the 90 degree portion is approximately 20 dB lower than the sound pressure level at the front portion.
Further, in a band of 100 Hz or less, the sound pressure level at a position of 180 degrees is 8 dB or more lower than the sound pressure level at the front part.
That is, the sound output from the speaker unit for woofer 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 cancel each other out. Part of the sound generated from the headrest 10 is prevented from being transmitted to the side or rear of the headrest 10, and sound leakage to the periphery of the speaker 14 is prevented.
The tweeter speaker unit 28 has a low directivity because the frequency component of the sound to be reproduced is high. Therefore, sound leakage to the periphery by the tweeter speaker unit 28 can be ignored.

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.
In other words, the provision of the opening 36 in the side wall 32 of the speaker box 18 ensures a low sound pressure level, which is advantageous for reproducing low-frequency sound well.

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 in the same manner as the headrest 10 of the embodiment except that the opening 36 is not formed in the speaker box 18.
Further, in the measurement of the frequency characteristics in FIG. 11, the measurement points were the same as in the case of FIG. 10.

As is clear from FIG. 11, in the band of 100 Hz or less, the sound pressure level at the 90 degree portion 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 90 ° is hardly lowered with respect to the sound pressure level at the front, and sound leakage from the speaker 14 to the surroundings is noticeably generated.

FIG. 12 is a diagram comparing the measurement results of the frequency characteristics at the front part 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 drastically 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.
In contrast, in the speaker device of the present embodiment, the f0 (minimum resonance frequency) of the speaker 14 can be made lower than that of the comparative example, and therefore the sound quality of the sound output by realizing a flatter frequency characteristic. It is advantageous to improve

As described above, according to 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 The inner ends of the speakers 14 located inside the contour of the main body 12 and located closer to the main body 12 are located behind the left and right ends of the main body 12, and the speakers 14 located closer to the main body 21 when viewed from the front. The inner end portion is located inside the contour of the main body 12.
That is, the inner end portion of each speaker 14 positioned closer to the main body 12 is disposed behind the left and right end portions of the main body 12, and the inner end portion of each speaker 14 positioned closer to the main body 12 when viewed from the front is Since the woofer speaker unit 26 and the tweeter speaker unit 28 are arranged on the inner side of the contour of the main body 12, the speaker units 26, while directing the central axes of the woofer speaker unit 26 and the tweeter speaker unit 28 to the left and right ears of the user, 28 can be arranged at the above-mentioned place close to the ear.
Therefore, according to the speaker device of the present embodiment, it is of course advantageous to enjoy a sound of good sound quality that is not easily affected by road noise that occurs as the automobile travels. When the seated user uses the seatbelt, the left and right side portions 13 of the headrest 10 do not interfere with the seatbelt, and the driver seated in the driver's seat faces backward. When visually recognizing the rear of the vehicle, the influence of the left and right side portions 13 on the field of view is kept to a minimum, which is advantageous in ensuring usability without giving various burdens to the user.

Further, according to the present embodiment, the speaker 14 is disposed at a location close to the user's ear with the back of the head being applied to the main body 12, and the plurality of openings that communicate the inside and the outside of the speaker box 18 are provided. Since 36 is formed on the side wall 32, the sound leakage of the speaker 14 is effectively prevented, and it is advantageous for improving the sound quality by securing a low sound pressure level.
Further, a simple configuration in which a plurality of openings 36 are formed in the side wall 32 of the speaker box 18 is not necessary, and it is not necessary to provide a dedicated sound leakage prevention member. Therefore, the headrest 10 is reduced in size and thickness while reducing costs. This is advantageous in achieving this.

  In the present embodiment, the case where the present invention is applied to the driver's seat of an automobile has been described. However, the speaker device of the present invention is widely applied to headrests of seats of various vehicles other than automobiles such as trains, airplanes, and ships. Is possible.

It is a front view of headrest 10 with which the speaker device of this embodiment was incorporated. It is A arrow directional view of FIG. It is a B arrow line view of FIG. It is the perspective view which looked at the headrest 10 with which the speaker apparatus of this Embodiment was integrated from the front. It is A arrow directional view of FIG. It is a B arrow view of FIG. It is C arrow line view of FIG. (A) is a rear view of the speaker box, (B) is a view from arrow B of (A), (C) is a view from arrow C of (A), (D) is a view from arrow D of (A), ( E) is a view on arrow E of (A). It is a figure which shows the positional relationship of the 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 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 symbols

  2 ... Seat back, 10 ... Headrest, 12 ... Body, 13 ... Side, 14 ... Speaker, 18 ... Speaker box, 26 ... Woofer speaker unit, 30 ... Rear wall, 32 ... Side wall, 36 ... opening, L2 ... center axis.

Claims (5)

A main body that is arranged above the seat back of the vehicle seat and that extends to the left and right and to which the user's back head is applied;
And left and right side portions connected to left and right ends of the main body,
A headrest is composed of the main body and the left and right sides,
The left and right side portions are configured to include a speaker supported by the main body and an outer skin covering the speaker,
The speaker has a speaker unit,
The speaker is arranged such that the center axis of the speaker unit is inclined with respect to the left and right extending direction of the main body so that the back of the head is directed to the left and right ears of the user applied to the main body.
When viewed from above, the left and right side portions are located inside the contour of the seat back,
When viewed from the side, the left and right side portions are located inside the contour of the main body,
The inner end of each speaker located closer to the body is located behind the left and right ends of the body,
When viewed from the front, the inner end of each speaker located closer to the main body is located inside the contour of the main body,
Speaker device. The main body includes a support rod removably attached to the seat back, a frame attached to the support rod, a pad attached to the frame, and a frame covering the frame and the pad. Comprising and including
The speaker is connected to the support rod or the frame;
A common skin is used for the skin of the main body and the skin of the left and right side parts,
The speaker device according to claim 1. The main body includes a support rod removably attached to the seat back, a frame attached to the support rod, a pad attached to the frame, and a frame covering the frame and the pad. Comprising and including
The speaker is connected to the support rod or the frame;
A common skin is used for the skin of the main body and the skin of the left and right side parts,
When viewed from above, the main body and the left and right side portions extend linearly in the left-right direction,
The speaker device according to claim 1. The speaker has a speaker box that houses the speaker unit,
The speaker box has a rear wall that covers the rear of the diaphragm, and a side wall that stands up forward from the rear wall and extends along the outer edge of the diaphragm outside the diaphragm,
A plurality of openings are formed in the side wall that communicates the inside and outside of the speaker box to prevent sound leakage to the periphery of the speaker unit and secure a low sound pressure level in the sound reproduced by the speaker unit. Formed,
The speaker device according to claim 1. The speaker unit is a speaker unit for a woofer,
The speaker further includes a tweeter speaker unit,
The tweeter speaker unit has a central axis extending from the main body of the speaker box that houses the woofer speaker unit so that a center axis of the tweeter is directed to the left and right ears of the user applied to the main body. It is arranged to be inclined with respect to the left-right extending direction of the main body at a location in front of the end portion away from
The speaker device according to claim 1.

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