US 20070024097 A1
An acoustic structure of seat back in which speaker units are provided in a padding of the seat back. The padding includes: a frontal backrest surface area which is recessed backwardly of the seat back; and securing holes formed in that frontal backrest surface area. An enclosure of each speaker unit, in which each speaker is securely accommodated, is secured in each of the securing holes. A sound-conductive cushion element is juxtaposed on the foregoing recessed frontal backrest surface area of padding so as to lie on a frontal side of each of the speaker units. The sound-conductive cushion element may be of a network structure to not only provide an improved back support touch, but also achieve an improved conductivity of sounds from the speaker units to a user's back portion. Those padding and sound-conductive cushion element are covered with a trim cover assembly.
1. An acoustic structure of seat back comprising:
a padding formed in conformity with a predetermined outer shape of said seat back, said padding including a frontal backrest surface area defined forwardly of the seat back, wherein said frontal backrest surface area is recessed in a direction backwardly of the seat back;
a plurality of securing holes formed in a central portion of a frontal backrest surface area of said padding;
a plurality of speaker units each comprising: a speaker having a frontal side facing to a side forwardly of said seat back; and an enclosure in which said speaker is securely accommodated, with said frontal side of the speaker being exposed therefrom,
said plurality of speaker units being secured in said frontal central backrest area of said padding, such that said enclosure is securely fitted in each of said plurality of securing holes, while said frontal side of said speaker is exposed from said each of said plurality of securing holes;
a seat back frame provided in said padding;
a sound-conductive cushion having a density lower than a density of said padding so as to provide high sound conductivity relative to the padding;
said sound-conductive cushion being securely juxtaposed on said frontal backrest surface area so as to cover said frontal side of said speaker associated with each of said plurality of speaker units;
wherein said sound-conductive cushion extends over an area greater than that in which all of the said plurality of speaker units are located in said central backrest area; and
a trim cover assembly covering said padding and said sound-conductive cushion.
2. The acoustic structure of seat back as claimed in
3. The acoustic structure of seat back as claimed in
1. Field of the Invention
The present invention relates to a sound system in an automotive seat, and in particular to an acoustic structure of seat back provided with speakers, wherein a sound is emitted from speakers to an occupant on the seat.
2. Description of Prior Arts
There has been known an automotive seat of the type having speakers provided therein, which allows a sound, such as music, to be emitted from the speakers directly to an occupant on the seat, so that the occupant can fully enjoy the sound with both his or her ears and body.
In this kind of seat, as disclosed from the Japanese Laid-Open Patent Publication No. 2002-346476, the speakers are provided behind a cushion material forming one constituent element of the seat so as to be in contact with a reverse side of the cushion material. While not taught in that literature, normally, the speakers are secured to a spring element typically provided in the seat.
The foregoing conventional acoustic structure of seat has, however, been found defective in that:
(i) the cushion material used is a foam padding material formed from urethane foam for optimal cushioning effect, but, is not suited for imparting the sound therethrough because of its property of absorbing sound and degrading acoustic effect, and
(ii) the sound emitted from each speaker is limited to a region which is substantially compassed by a diameter of the speaker itself, and such limited range of sound emission is directed to the back of an occupant on the seat, as a result of which, the occupant can not enjoy the music satisfactorily, and can not feel such vivid sound as if the music was performed in a real concert hall, neither, due to the foregoing sound absorption by the foam cushion material.
On the other hand, as known from the Japanese Laid-Open Patent Publication No 2004-97654, there is a seat having exposed speakers in its seat back to enable direct emission of sound to an occupant on the seat. According thereto, a through-bore is formed in both of foam cushion material and top cover member of the seat back and a speaker is secured in the through-bore, so that a frontal side of the speaker is exposed from the frontal surface of seat back and directly faces toward the seat occupant. However, such exposed speakers interfere with the occupant's movement, thus impairing a comfortable seating condition of the seat, and further, the range of sound emission from such exposed speaker arrangement is limited to a narrow space around the seat occupant, so that the occupant can not fully enjoy the sound or music with his or her body.
In view of the above-stated drawbacks, it is a purpose of the present invention to provide an improved acoustic structure of seat back which allows for wide expansion of a sound emitted from speakers in seat back to an entire area of back of a seat occupant, thereby giving the occupant a splendid impression as if the music was actually and vividly played, while allowing for provision of a high cushiony effect and a high air permeability.
In order to achieve such purpose, the acoustic structure of seat back in accordance with the present invention is basically comprised of:
Preferably, the foregoing sound-conductive cushion means is a network cushiony element which is formed by deforming a straw-like fiber and fusing a plurality of points of the straw-like fiber to provide a network cushiony structure therein.
Preferably, a pair of the sound-conductive cushion means are provided independently of each other and are securely juxtaposed on the frontal backrest surface area.
Other various features and effects of the present invention will become apparent from reading of the descriptions, hereinafter, with reference to the annexed drawings.
Referring to FIGS. 1 to 6, it should be noted that the reference numeral (10) indicates a generic mode of acoustic structure of seat back of automotive seat in accordance with the present invention, which commonly covers the non-distinctive first and second exemplary embodiments of the seat-back acoustic structure which are respectively shown in a set of FIGS. 1 to 3 and
As generally shown in
At first, reference is made to
In the illustrative acoustic structure, a pair of small speaker units (14) (14) and one large speaker unit (13) are used for instance. As shown in
The foam padding (22) is formed in a typical shape conforming to a normal outer shape of seat back and has a frontal backrest surface area (22A), a pair of lateral portions (22B) (22B), and an upper portion (22C). But, in accordance with the present invention, as seen from
As understandable from
The seat-back frame (11) itself is a known frame and is composed of an upper frame section (11A), a pair of lateral frame sections (11B) (11B) and a lower frame section (11C). Designations (21) denote sinuous springs extended between the two lateral frame sections (11B). The illustrated seat-back frame (11) is of the type wherein a pair of headrest stay holders (11H) (11H) are provided on the upper frame section (11A).
As can be seen from
In the present embodiment, the sound-conductive cushion element, designated by (19), is basically a cushiony plate material of network structure which is formed by securely knitting or entangling together a continuous hollow fiber. Specifically for example, as best shown in
It is noted here that the network cushiony plate member (19) has a depth generally equal to the afore-stated backwardly recessed degree of the frontal backrest surface area (22A). In other words, the network cushionny plate member (19) is generally equal in dimensions to the aforementioned recessed frontal backrest surface area (22A) of foam padding (22).
As shown in
Designation (20) denotes a trim cover assembly which is preformed in substantially the same configuration as the outer shape of the foregoing foam padding (22).
As understandable from
With the above-described structure, it is to be appreciated that the following effects are attained:
As shown in
Briefly stated, the active headrest unit (30) has a motor (not shown) and a movable element (30A) adapted to support a pair of headrest stays (not shown), with such an arrangement that the movable element (30A) is moved vertically by the motor so as to cause adjustable vertical movement of a headrest (not shown). Designations (30H) (30H) denote a pair of headrest stay holes in which the pair of headrest stays are respectively inserted, though not shown.
Likewise in the first embodiment, both two network cushiony plate members (19A) (19B) are formed from the straw-like fiber (F) bent and tangled, with a plurality points thereof are adhered to one another by means of thermal fusing, as indicated by (P), with spaces (S) given among the thus-tangled and adhered fiber (F), so as to form a network cushiony plate member having a high sound conductivity. Also, a whole of the two network cushiony plate members (19A) (19B) has a depth generally equal to the afore-stated backwardly recessed degree of the central portion (22A), and, in other words, a whole of those two members (19A) (19B) are generally equal in dimensions to the recessed central frontal backrest surface area (22A) of foam padding (22).
As shown in
In addition to the effects stated from the items (i) to (iv) above, the present second embodiment further attains the following effects: the two separate network cushiony plate members (19A) (19B) are easily bendable and deformable in conformity with the back of a seat occupant, and in particular, the first network cushiony plate member (19A) serves as an effective buffer to absorb the vertical movement of the active headrest support mechanism (30) so that the seat occupant can always enjoy a comfortable back support touch.
In both the first and second embodiment, preferably, the trim cover assembly (20) is performed by permeable materials to improve the sound conductivity and air permeability.
While having described the present invention so far, it should be understood that the invention is not limited to the illustrated embodiments, but any modification, replacement and addition may be applied thereto without departing from the scopes of the appended claims.