Woofer arrangement under a vehicle seat

0001The invention relates to an arrangement under a low-frequency loudspeaker a vehicle seat.

0002Such an arrangement is known from PATENT ABSTRACTS OF JAPAN, vol.016, no.574 (E-1298), December 14, 1992, JP 04 223697 A is known. It takes place a sound emission of the speaker in the vehicle interior via a Sound tube which is formed by the longitudinal beams of the vehicle. The sound tube ends around under the dash.

0003It is also such an arrangement from US 5,193,118 known. Here, the Speakers mounted together with a vehicle front seat. The resonance volume is limited to the rear side by the vehicle floor. Although is also provided the vehicle floor to increase the resonance volume lower. For an effective bass loudspeaker, especially a subwoofer However, the resonance volume not sufficient. In addition the Problem of interference. Since both the speaker and the resonance volume have directed into the vehicle interior sound outlet opening, there is a sound cancellation due to interference. This is the more serious, effectiveness of such a loudspeaker.

0004The invention is based on the object, an arrangement of the aforementioned to create the kind in which a structurally simple manner an effective arrangement a bass speaker is reached under a vehicle seat.

0005The invention solves this problem by the features of claim 1.

0006The envisaged in the invention acoustic connection between the sill volume and the rear space of the speaker in the form of the passage opening designed acoustically low. This makes it possible, the bass response to optimize. At the same time the strength of the supporting frame is maintained.

0007In the invention, the sound emission of the speaker is performed in the vehicle interior about the sound outlet surface of the speaker. The sound outlet located directly behind the speaker membrane and is in the Vehicle interior facing. The sound emergence here is identical to the Lautsprechereinbauort. The sill volume merely amplifies the effect of the Speaker. It acts as a resonance volume and helps to below the vehicle seat operate in a really small package to a base speaker to.

0008In contrast, in the JP-documents mentioned above, a sound tube provided (24) for the sound line which by the longitudinal member of the vehicle is formed. The sound tube ends approximately below the dashboard. Its end is as a sound-emitting surface.

0009Contrary also to US 5,193,118 now the resonance volume is also not more acoustically connected to the vehicle interior. This eliminates interference phenomena completely gone. In addition, the effective volume is only by the volume of the support frame is limited. This can, for example, also in view be designed in the effective sound reproduction such that the resonance volume is sufficient. It is then possible without additional measures acoustic, a bass loudspeaker acoustically effective to arrange.

0010An improvement of the invention consists in the sill volume via diffusion openings to connect with the environment. This is the resonance volume formed by the rear space of the speaker, the volume rocker and the adjoining ambient volume. As this rule is not limited, can thus the resonance volume be any size and optimal acoustic Effect of the bass speaker can be achieved even at low frequencies. At the same time, by the votes of diffusion openings usually sufficient Protection of the speaker and his rear compartment from the ingress of Moisture can be achieved.

0011Reference to the drawing, the invention is further explained. The sole FIG. the inventive arrangement of a bass loudspeaker (1) under a Vehicle seat.

0012A vehicle seat is indicated by its holding rail 2nd The retainer rail 2 is mounted on the base plate. 3 Further, a longitudinal to the longitudinal axis Support frame 4 is shown, which at regular intervals of about 20 cm diffuse openings 5 ​​Area has out.

0013The loudspeaker 1 is composed essentially of a membrane 6 with a Diameter of 200 mm, which is moved by a drive, not shown and an area covered by a fleece 7 Sound outlet face 8 with sound low frequencies of 50 to 300 Hz to write into the interior of the vehicle. 9

0014The resonance volume of the loudspeaker 1 is formed from the back 10 the speaker 1 in which there is also the drive, and the volume 11 (Hereinafter called sill volume), which is limited by the supporting frame 4 is and further through the via opening 5 acoustically connected external volume surroundings. especially since the external volume is unlimited, can so that the speakers work with a non-limited resonant volume. At the same time a sound radiation only via the sound outlet opening 8 in the interior 9 of the vehicle, since in addition between the loudspeakers 1 and the supporting frame 4, a high frequency sound insulation 12 is provided. Thereby is an acoustic coupling of the support frame 4 to the speaker 1, ie prevented an excitation of the support frame 4 by the drive.

0015there is an intermediate space 10 to the rear and the rocker volume 11 Through opening 13, which is on the one hand sufficiently large for an unhindered Sound transmission to ensure in the sill volume 11 and the other part is sufficiently small sized to the mechanical stability of Supporting frame 4 not to interfere.

0016Since via the openings 5, for example, at a water crossing in moisture the sill volume 11 and thus can pass in the backcourt is 10, the Drive the speaker and the membrane 6 watertight (not shown).

0017The arrangement of the speaker 1 can, as known per se, under the front seats be made. However, it is also possible for this purpose to the backseat use. In any case, the acoustic effect of the loudspeaker is optimal because the resonance volume is practically unlimited and a sound radiation only via the membrane 6 towards the interior, while the rear space 10 and the sill volume 11 only radiate to the environment sound. Thereby Interference phenomena are avoided. Since the opening 5 is made small, is a coupling of high-frequency ambient noise in the volumes 10 and 11 largely suppressed.