JP4403581B2 - Upper back structure with automobile speaker - Google Patents

Description

  The present invention relates to an upper back structure with a speaker provided on the rear side of a rear seat of an automobile.

  A conventional upper back structure 1 shown in FIG. 9 includes an upper back 2 made of a plate-like member, and this upper back 2 is disposed in a vehicle compartment in a trunk or a luggage compartment on the rear side of a rear seat (not shown) of an automobile. The speaker 3 is mounted horizontally in a speaker mounting hole provided at the center thereof, and its front edge extends downward. According to such a configuration, the speaker 3 is supported upward behind the rear seat, so that a sound is emitted from the trunk or the floor of the luggage compartment. In the figure, arrow Fr indicates the front of the vehicle, Up indicates the vehicle upper side, and W indicates the vehicle width direction.

  In Patent Document 1, a mounting bracket attached to a speaker body is opposed to the back side of the mounting plate, and an air damper formed in an annular shape surrounding the speaker body and enclosing air is interposed between the mounting plate and the mounting bracket or the flange. An on-vehicle speaker mounting device is disclosed. According to the on-vehicle speaker mounting device having such a configuration, the speaker body is fixed to the mounting plate by the reaction of the air damper, the mounting work is facilitated, and the possibility of impairing the acoustic effect is eliminated.

In Patent Document 2, a door speaker and a bracket disposed close to the door outer panel are connected to each other via a highly rigid screw rod, thereby increasing the support rigidity of the door speaker, and vibration of the door speaker itself due to operation. There is disclosed a door speaker mounting structure for preventing the above-described problem. According to the door speaker mounting structure having such a configuration, loss of acoustic energy of the door speaker can be prevented and speaker performance can be improved without increasing the number of door inner panel plates.
Japanese Utility Model Publication No. 04-101753 Japanese Patent Laid-Open No. 11-151989

In the upper back structure 1, the following problems arise because the upper back 2 vibrates in the resonance mode by the operation of the speaker 3.
First, with respect to the front-rear direction of the upper back 2, as shown by an arrow A in FIG. 10A, when resonance occurs in the same phase as the speaker diaphragm (hereinafter referred to as speaker in-phase), this resonance is different. It may cause deterioration of sound (billing sound) and speaker sound quality. In addition, as shown by an arrow B in FIG. 10B, when resonance occurs in a phase opposite to the phase of the diaphragm of the speaker (hereinafter referred to as the speaker reverse phase), this resonance causes a low-frequency booming noise. .

  Here, in order to suppress the resonance A of the speaker in-phase, it is necessary to increase the resonance frequency in the front-rear direction of the upper back 2, and the countermeasure is to increase the bending rigidity in the front-rear direction. Further, in order to suppress the resonance B of the speaker reverse phase, it is necessary to lower the resonance frequency in the front-rear direction of the upper back 2, and the countermeasure is to lower the bending rigidity in the front-rear direction.

  Next, regarding the vehicle width direction of the upper back 2, as shown by an arrow C in FIG. In addition, as shown by an arrow D in FIG. 11B, when resonance of the speaker reverse phase occurs, it causes high-frequency booming noise.

  Here, in order to suppress the resonance C in the speaker in-phase, it is necessary to lower the resonance frequency in the left-right direction of the upper back 2, and the countermeasure is to lower the bending rigidity in the left-right direction. Moreover, in order to suppress the resonance D of the speaker reverse phase, it is necessary to increase the resonance frequency in the left-right direction of the upper back 2, and the countermeasure is to increase the bending rigidity in the left-right direction.

  Accordingly, since the countermeasures for suppressing the resonance between the speaker in-phase and the speaker opposite phase are opposite to each other in both the front-rear direction and the vehicle width direction of the upper back 2, the resonance control of the upper back 2 is controlled by the speaker in-phase and the speaker opposite phase. It was difficult to achieve both. For this reason, conventionally, only low-frequency resonance is suppressed on the upper back 2 side, and medium-frequency and high-frequency resonances are suppressed by measures against other members and the like.

  However, such measures cannot suppress the generation of abnormal noise (battering noise) or deterioration of speaker sound quality, and measures against resonance of the upper back 2 are applied to other members and the like. The work efficiency is lowered and the cost is increased.

On the other hand, the mounting device for a vehicle-mounted speaker according to Patent Document 1 is for securely fixing the speaker to the mounting plate and does not suppress the resonance of the mounting plate. , Structure and effect are different.
Further, the door speaker mounting structure according to Patent Document 2 is for preventing the vibration of the speaker itself by attaching the speaker to the inner panel of the automobile door, and suppressing the resonance of the inner panel as the mounting portion. However, the present invention is different from the present invention in object, configuration and effect.

  The present invention was created in view of the above points, and with a simple configuration, resonance is suppressed only by the upper back, thereby eliminating abnormal sounds (battering sounds) and deterioration of speaker sound quality, as well as booming sounds. An object of the present invention is to provide an upper back structure with a speaker for an automobile that reduces the above-described problem.

In order to achieve the above object, the present invention provides an automobile speaker provided with an upper back that is horizontally held behind the rear seat of the automobile and a speaker that is mounted upward in a speaker mounting hole provided in the upper back. In the upper back structure, a mass damper is provided at an antinode position of the resonance mode with respect to the resonance mode of the speaker opposite phase in the vehicle width direction of the upper back, and around the speaker with respect to the resonance mode of the speaker in phase in the front and rear direction of the upper back. A first reinforcing member is provided, a first folding portion is provided at the antinode position of the resonance mode with respect to the resonance mode of the speaker reverse phase in the front-rear direction of the upper back, and the speaker reverse phase resonance in the vehicle width direction of the upper back A second fold-up part is provided at the antinode position of the resonance mode with respect to the mode, and the upper back Is characterized in that a second reinforcing member to the node position of the resonance modes of the loudspeaker reverse phase in the vehicle width direction of the upper back against resonant mode loudspeakers phase in the rearward direction.
In the present invention, the first folding trigger part and the second folding trigger part are formed as tear lines such as notches and dotted lines in addition to those formed in the upper back in the form of grooves.

According to the present invention, the resonance mode of the speaker reverse phase in the vehicle width direction (left and right direction) of the upper back is suppressed by the mass damper provided at the antinode, so the resonance frequency of the speaker reverse phase in the left and right direction is reduced. Thus, the generation of low frequency booming noise is suppressed.
In addition, since the resonance mode of the speaker in-phase in the front-rear direction of the upper back is suppressed by the first reinforcing member such as a bead provided around the speaker, the resonance frequency of the speaker in-phase in the front-rear direction is increased and noise (battery) Generation of sound) and deterioration of speaker sound quality are suppressed, and the resonance mode of the speaker reverse phase is also suppressed because the first reinforcing member extends to the rear of the speaker.

Furthermore, since the resonance mode of the speaker reverse phase in the front-rear direction of the upper back is suppressed by the first folding part provided at the antinode, the resonance frequency of the speaker reverse phase in the front-rear direction is lowered, and the low frequency The generation of a booming noise is suppressed.
In addition, the resonance mode of the speaker reverse phase in the vehicle width direction (left and right direction) of the upper back is suppressed by the second folding part provided at the antinode, so the resonance frequency of the speaker reverse phase in the left and right direction is lowered. Thus, the generation of high-frequency booming noise is suppressed.

  The second reinforcing member reinforces the bending rigidity in the front-rear direction against the resonance mode of the speaker in-phase in the front-rear direction of the upper back. Therefore, generation of abnormal noise (billing noise) and deterioration of speaker sound quality are suppressed.

  As described above, according to the present invention, generation of abnormal noise (battering sound) and deterioration of speaker sound quality are eliminated, and the noise from low frequency to high frequency is reduced, thereby improving the acoustic characteristics of the speaker. . Therefore, it is not necessary to take measures to suppress the resonance of the upper back for members other than the upper back, and the resonance control can be performed only by the upper back, and the upper back structure is simple and low-cost. Can be configured.

Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings. In the figure, arrow Fr indicates the front side of the vehicle, Up indicates the upper side of the vehicle, and W indicates the vehicle width direction.
FIG. 1 is a view showing an upper back structure 10 for an automobile according to an embodiment of the present invention. The upper back structure 10 for an automobile includes an upper back 11 made of a plate-like member, and a rear seat (not shown) of the automobile. In the rear trunk or luggage compartment, the speaker 12 is held horizontally over almost the entire width of the passenger compartment, and the speaker 12 is mounted upward in a speaker mounting hole provided in the center of the trunk. It extends towards.

The automobile upper back structure 10 according to the present invention is different from the conventional automobile upper back structure 1 shown in FIG. 9 in the following configuration.
First, with respect to the resonance mode of the speaker reverse phase in the vehicle width direction of the upper back 11, the mass damper 13 is provided at the antinode position of this resonance mode. Here, as shown in FIGS. 1 and 2, the mass damper 13 is provided on a straight line extending in the vehicle width direction passing through the center of the speaker 12, and suppresses the resonance mode of the speaker reverse phase in the vehicle width direction. Then, the resonance frequency is lowered. Thereby, generation | occurrence | production of the high frequency booming sound is reduced.

  Next, the first reinforcing member 14 is disposed around the mounting position of the speaker 12 with respect to the resonance mode of the speaker in-phase in the front-rear direction of the upper back 11. For example, as shown in FIGS. 1 and 3, a plate-like panel as the first reinforcing member 14 is overlapped and joined around a speaker mounting hole formed in the center of the upper back 11, and the periphery of the speaker is Thickened. Further, instead of the plate-like panel, a bead having a semicircular cross section may be disposed in a streak shape on the upper back 11 so as to surround the speaker. As a result, the bending rigidity in the front-rear direction of the upper back 11 is increased, so that the resonance frequency is increased, the resonance mode of the speaker in-phase in the front-rear direction is suppressed, and the first reinforcing member 14 reinforces the rear side of the speaker 12. By doing so, the resonance mode of the speaker reverse phase in the front-rear direction is also suppressed. Therefore, generation of abnormal noise (billing noise) and deterioration of speaker sound quality are suppressed.

  Further, with respect to the resonance mode of the speaker reverse phase in the front-rear direction of the upper back 12, a first folding start portion 15 is provided at the antinode phase of the resonance mode to trigger the bending of the upper back 12. . As shown in FIG. 1, the first folding start portion 15 is provided so as to extend laterally on the rear side of the speaker with respect to the front-rear direction of the speaker 12. For example, the first folding start portion 15 is formed as a streak-like groove in the upper back 12. As a result, this resonance mode is suppressed by causing the first folding start portion 15 to fold 15a as shown in FIG. 4 with respect to the resonance mode of the speaker reverse phase in the front-rear direction. Is reduced.

  Next, with respect to the resonance mode of the speaker reverse phase in the vehicle width direction of the upper back 12, a second folding trigger portion 16 is provided at the antinode position of this resonance mode as a trigger for the bending of the upper back 12. It has been. As shown in FIG. 1 and FIG. 5A, the second folding start portion 16 is provided to extend in the front-rear direction at positions on both sides of the speaker 12 with respect to the vehicle width direction of the speaker 12. For example, the second folding start portion 16 is formed as a streak-like groove in the upper back 12. Thereby, this resonance mode is suppressed by producing a fold 16a, as shown in FIG. 5B, with respect to the resonance mode of the speaker opposite phase in the left-right direction. Generation of high-frequency booming noise is reduced.

  Further, a second reinforcing member 17 is provided for the resonance mode of the speaker in-phase in the front-rear direction of the upper back 11. The second reinforcing member 17 is provided at the node position of the resonance mode of the speaker reverse phase in the vehicle width direction of the upper back 12 so as not to affect the resonance mode of the speaker reverse phase in the vehicle width direction of the upper back 12. Yes. As shown in FIGS. 1 and 6, the reinforcement as the second reinforcing member 17 is in the front-rear direction at the positions on both sides of the speaker 12 with respect to the vehicle width direction of the speaker 12 and outside the second folding portion 16. It is provided so that it may extend. Thereby, the reinforcement 17 reinforces the bending rigidity in the front-rear direction with respect to the resonance mode of the speaker in-phase in the front-rear direction of the upper back 11.

  The automobile upper back structure 10 according to the embodiment of the present invention is configured as described above. With the upper back 11 attached to the rear of the passenger compartment of the automobile, the speaker 12 is driven, and voice, music, etc. Is generated, the vibration of the speaker 12 is transmitted to the upper back 11, and the upper back 11 attempts to resonate at its inherent resonance frequency. At this time, the resonance mode of the speaker in-phase and the speaker reverse phase and the resonance mode of the speaker in-phase and the speaker reverse phase are generated in the left-right direction with respect to the front-back direction of the upper back 11.

  Here, the resonance modes of the speaker in-phase and the speaker anti-phase in the front-rear direction are suppressed by the first reinforcing member 14, the first folding portion 15, and the second reinforcing member 17. In addition, since the resonance mode of the speaker reverse phase in the vehicle width direction is suppressed by the mass damper 13 and the second folding part 16, the resonance of the upper back from the low frequency to the high frequency is suppressed.

  As a result, the generation of abnormal noise (billing noise) due to resonance of the upper back 11 and deterioration of the speaker sound quality are eliminated, and the muffled sound from the low frequency to the high frequency is reduced, and the acoustic characteristics of the speaker are improved.

  7 and 8 are graphs showing the resonance frequency characteristics in the simulation when the speaker is driven in the above-described automobile upper back structure 10. The solid line represents the resonance frequency characteristics of the upper back structure 10, and the dotted line represents the conventional upper back structure. The resonance frequency characteristics are shown. FIG. 7 shows a resonance frequency characteristic of a low frequency, and it can be seen that the sound pressure level is improved by about 5 dB particularly in the vicinity of 70 Hz. Further, FIG. 8 shows the resonance frequency characteristics of the high frequency, and it can be seen that the sound pressure level is improved by about 6 dB or more particularly in the vicinity of 100 Hz and 170 Hz.

  The present invention can be implemented in various forms without departing from the spirit of the present invention. For example, it is obvious that the present invention can be applied to a case where a plurality of speakers are attached to the central region of the upper back. The first folding trigger part and the second folding trigger part may be formed as tear lines such as cuts and dotted lines.

It is a schematic perspective view which shows the structure of one Embodiment of the upper back structure with a speaker of the motor vehicle by this invention. It is a schematic sectional drawing of the left-right direction which shows arrangement | positioning of the mass damper in the upper back structure of FIG. It is a schematic sectional drawing of the front-back direction which shows arrangement | positioning of the 1st reinforcement member in the upper back structure of FIG. It is a schematic sectional drawing of the front-back direction which shows arrangement | positioning of the 1st folding part in the upper back structure of FIG. (A) is a schematic cross-sectional view in the left-right direction, showing the arrangement of the second folding part in the upper back structure of FIG. 1, and (B), respectively, showing deformation due to resonance. It is a schematic sectional drawing of the left-right direction which shows arrangement | positioning of the 2nd reinforcement member in the upper back structure of FIG. It is a graph which shows the resonant frequency characteristic of the low frequency in the upper back structure of FIG. 2 is a graph showing high-frequency resonance frequency characteristics in the upper back structure of FIG. 1. It is a schematic perspective view which shows the structure of an example of the conventional upper back structure. In the upper back structure of FIG. 9, (A) is a schematic cross-sectional view in the front-rear direction showing a speaker in-phase in the front-rear direction, and (B) is a resonance mode in the speaker reverse phase. In the upper back structure of FIG. 9, (A) is a schematic cross-sectional view in the left-right direction showing the speaker in-phase in the left-right direction, and (B) is a resonance mode in the speaker reverse phase.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Upper back structure with a speaker 11 Upper back 12 Speaker 13 Mass damper 14 Bead 15 1st folding start part 16 2nd folding start part 17 Reinforcement

Claims (3)

In an upper back structure with a speaker of an automobile, comprising an upper back held horizontally on the rear side of the rear seat of the automobile, and a speaker attached upward to a speaker attachment hole provided in the upper back,
For the resonance mode of the speaker reverse phase in the vehicle width direction of the upper back, a mass damper is provided at the antinode position of the resonance mode,
For the resonance mode of the speaker in-phase in the front-rear direction of the upper back, a first reinforcing member is provided around the speaker,
For the resonance mode of the speaker reverse phase in the front-rear direction of the upper back, a first folding part is provided at the antinode position of the resonance mode,
For the resonance mode of the speaker reverse phase in the vehicle width direction of the upper back, a second folding part is provided at the antinode position of the resonance mode,
A second reinforcing member is provided at a node position of the resonance mode of the speaker reverse phase in the vehicle width direction of the upper back with respect to the resonance mode of the speaker in-phase in the front-rear direction of the upper back, Upper back structure with automobile speaker.   2. The upper back structure with a speaker for an automobile according to claim 1, wherein the first folding trigger part and the second folding trigger part are grooves formed in the upper back.   The upper back structure with a speaker for an automobile according to claim 1, wherein the first reinforcing member is a bead.

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