JP2008160651A - Method and device for generating divided vibration - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for generating divided vibration capable of easily generating the divided vibration to a board member with complicated shapes. <P>SOLUTION: Vibration is generated to a plurality of drive points (vibration generation points) 11a, 11b in a panel (board member) 11 by an exciter (vibration generation means) 12, the vibration generated from the plurality of drive points 11a, 11b are interfered and the panel 11 is made to generate the divided vibration. By the present invention, the divided vibration is easily generated without setting points of the drive points so exactly. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a split vibration generation method and apparatus suitable for application to interior materials of vehicles.

  Conventionally, as shown in FIG. 8, when split vibration is generated in a plate member 50 that functions as a diaphragm, vibration is generated by an exciter 51 at a drive point (vibration generation point) 50 b deviated from the center 50 a of the plate member 50. As a result, split vibration (distributed mode) was generated.

For example, when the length of the plate member 50 is L and the width is W, the position of the drive point 50b at which the divided vibration can be satisfactorily generated is (3/7) W long from the vertex 50c of the plate member 50 in the width direction. In the direction (4 /
9) The point is displaced by L.

  Split vibration means that when a diaphragm, which is an elastic body, vibrates, each part of the diaphragm is divided into areas divided by nodes at a specific natural frequency, and each part vibrates with a non-uniform phase. It is a phenomenon. By this divided vibration, sound can be generated from a plurality of positions of the diaphragm.

  This phenomenon of divided vibration is particularly common when a diaphragm having a relatively large area vibrates in a frequency region higher than the reproduction band. Therefore, the frequency at which the divided vibration occurs is separated from the normal resonance frequency that appears in the reproduction band. Separately, it may be referred to as “high frequency resonance frequency”.

For example, the loudspeaker makes a sound when the diaphragm moves by a piston, but when the frequency of the signal exceeds the limit of the diaphragm, the diaphragm itself starts split vibration. The band can be expanded using this divided vibration.
JP 2003-125475 A JP 2005-198342 A Japanese Patent No. 3200937

  However, in the conventional split vibration generation technique, when the plate member 50 has a simple shape such as a rectangle, the drive point 50b for obtaining a good split vibration can be obtained relatively easily. It has been difficult to obtain the position of the drive point 50b for a plate member having a complicated shape such as a ceiling material. For this reason, it is difficult to generate divided vibrations in a plate member having a complicated shape.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a split vibration generation method and apparatus that can easily cause split vibration even with a plate member having a complicated shape.

The present invention employs the following means in order to solve the above problems.
That is, the present invention
Generate vibration by vibration generating means at a plurality of vibration generating points in one plate member,
The divided vibration is generated in the plate member by causing the vibrations generated at the plurality of vibration generation points to interfere with each other.

  According to the present invention, since the plurality of vibration generation points are driven by the vibration generating means and the divided vibrations are generated by causing the vibrations generated at the plurality of vibration generation points to interfere with each other, the position of the vibration generation point is set so accurately. There is no need to do. Therefore, even if it is a board member (diaphragm) of a complicated shape, division vibration can be generated easily. The vibration generating means can be exemplified by an exciter.

  Here, a plurality of vibration generating means can be provided, and the plurality of vibration generating means can be controlled by the same signal. Further, the plurality of vibration generating means can be controlled by the same phase.

  In addition, the interval between the vibration generation points is preferably set to 1/8 to 1/2 of the wavelength in the vibration of a predetermined frequency generated at the vibration generation point. If the interval between the vibration generation points is too wide, the amplitude of the divided vibration may be weakened.

  The interval between the vibration generation points is more preferably ¼ or less of the wavelength.

  Moreover, the said board member can illustrate the interior material of a vehicle. Moreover, a ceiling material, a door trim, a package tray, a pillar, and an instrument panel can be illustrated as an interior material, and this invention is applicable to one or two or more among these.

The present invention also provides:
Vibration generating means for generating vibration;
A contact portion connected to the vibration generating means and transmitting the vibration generated by the vibration generating means to a body to be vibrated;
The contact portion has a plurality of contact portions that come into contact with the vibrating body,
The interval between the plurality of contact portions is an interval for generating divided vibrations.

The present invention also provides:
A plate member;
Vibration generating means for generating vibration;
A contact portion connected to the vibration generating means and transmitting the vibration generated by the vibration generating means to the plate member;
The contact portion has a plurality of contact portions that come into contact with the plate member,
The interval between the plurality of contact portions is an interval for generating divided vibrations.
The said plate member can illustrate the interior material of a vehicle.

  According to the present invention, the vibration is generated by the vibration generating means at the plurality of vibration generation points of the plate member, and the divided vibration is generated by causing the vibration generated at the plurality of vibration generation points to interfere with each other. For this reason, even if the plate member has a complicated shape, the divided vibration can be easily generated.

  Hereinafter, embodiments of a divided vibration generating method and apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

<< First Embodiment >>
FIG. 1 is a diagram for explaining a divided vibration generating method according to the first embodiment of the present invention. In this divided vibration generation method, a plurality of drive points (vibration generation points) 11a and 11b in a single panel (plate member) 11 functioning as a vibration plate are driven by exciters (vibration generation means) 12a and 12b. Vibration is generated at the drive points 11a and 11b.

  In the present embodiment, a case where there are two drive points 11a and 11b will be described, but the same applies to a case where there are three or more drive points.

  The vibration generated at each drive point 11a, 11b propagates concentrically in the panel 11 as if it were ripples, and generates a split vibration by interfering with each other. In addition, the code | symbol 13 in FIG. 1 shows the node (convex or concave point) by vibration interference.

  In the present embodiment, the same signal is input to the exciters 12a and 12b in the same phase. As the exciters 12a and 12b, known exciters can be used (see, for example, JP-A-2002-27588).

  An exciter described in JP-A-2002-27588 includes a voice coil wound around a bobbin portion and a magnetic circuit that forms a magnetic gap between the voice coil. In this exciter, when an acoustic reproduction signal flows through the voice coil, the bobbin moves with the voice coil in accordance with the strength of the exciter. Thereby, the diaphragm in contact with the output part of the bobbin vibrates to reproduce sound.

  The exciters 12a and 12b can use various exciters in addition to the exciter.

  The panel 11 can use an irregularly shaped plate member instead of a rectangle or a square. In the present embodiment, the substantially octagonal panel 11 is used, but various other complicated shapes (unshaped) plate members can be used.

  The exciters 12a and 12b in FIG. 1, that is, the drive points 11a and 11b are arranged at a predetermined interval B from each other.

  The distance B between the drive points 11a and 11b is set so that the drive points 11a and 11b are positioned at the antinodes in the amplitude of the vibration when vibrations of a predetermined frequency occur at the drive points 11a and 11b. It is preferable to do this.

  In the present embodiment, the interval B between the drive points 11a and 11b is set to ¼ of the wavelength in vibration (sound) of a predetermined frequency generated at the drive points 11a and 11b.

  In the present embodiment, the interval B between the drive points 11a and 11b is set to ¼ of the wavelength in the vibration of the low frequency reproduction frequency (400 Hz to 800 Hz) generated at the drive points 11a and 11b.

  In particular, when the main purpose is high-frequency reproduction, the interval B between the drive points 11a and 11b may be set shorter than ¼ of the wavelength in the vibration of the low-frequency reproduction frequency.

  When the interval B between the driving points 11a and 11b is set to ½ of the wavelength of vibration at a predetermined frequency, the vibrations generated from the driving points 11a and 11b are in opposite phases, and the amplitude of vibration is weakened at this predetermined frequency. There is a risk that.

  In addition, if the distance B between the drive points 11a and 11b is too wide, the effect of split vibration may be reduced at a high frequency with low energy.

FIG. 2 shows the amplitude of vibration generated at the drive points 11a and 11b when the interval B between the two drive points 11a and 11b is ¼ wavelength in the vibration of the low frequency reproduction frequency generated at the drive points 11a and 11b. FIG. 3 shows the amplitude of vibration generated at the drive points 11a and 11b when the interval B between the two drive points 11a and 11b is ½ wavelength in the same low frequency reproduction frequency vibration as described above. Show.

  2 and 3, reference numeral 20 indicates the amplitude of vibration generated at one drive point 11a, 21 indicates the amplitude of vibration generated at the other drive point 11b, and 22 indicates the amplitude generated at the two drive points 11a and 11b. The amplitude in the synthetic vibration with which the vibration was synthesized is shown.

  2 and 3, when the drive point interval B is 1/4 of the wavelength of the low-frequency reproduction frequency vibration generated at the drive points 11a and 11b, the amplitude 22 of the combined vibration is large, and the interval B is the vibration described above. It can be seen that the amplitude 22 of the combined vibration is almost 0 in the case of ½ of the wavelength at.

  For this reason, the distance B between the drive points 11a and 11b is desirably ½ or less, preferably ¼ or less of the wavelength in the vibration of the predetermined frequency generated at the drive points 11a and 11b.

  Further, the minimum interval B between the drive points 11a and 11b is limited by the interval necessary for mounting the exciters 12a and 12b, but is about 1/8 of the wavelength in the vibration of the predetermined frequency generated at the drive points 11a and 11b. And

  That is, the interval B between the drive points 11a and 11b is preferably set between a predetermined frequency generated at the drive points 11a and 11b, for example, between 1/8 and 1/2 of the wavelength in the vibration of the low frequency reproduction frequency.

  As described above, according to the split vibration generating method of the present invention, vibration is generated at the plurality of drive points 11a and 11b by the exciters 12a and 12b, respectively, and these vibrations are caused to interfere to generate split vibration. The positions of the drive points 11a and 11b can be set relatively freely, and the divided vibration can be easily generated in the diaphragm having a complicated shape.

  On the other hand, when split vibration is generated by driving one drive point with an exciter as in the prior art, the position of the drive point must be set relatively accurately. Since it is difficult to set the exact position of the driving point, it is difficult to generate divided vibrations on the diaphragm having a complicated shape.

  In the above embodiment, the case where two drive points are provided has been described. However, three or more drive points can be provided. In this case, an exciter can be provided at each drive point.

<< Second Embodiment >>
FIG. 4 shows a split vibration generator 30 according to a second embodiment of the present invention. The split vibration generator 30 vibrates a panel 31 that is a single plate member (vibrating plate, a body to be vibrated) and a plurality of driving points of the panel 31, that is, two driving points 32a and 32b in this embodiment. A bracket (contact portion) having one exciter 33 to be generated, and a contact portion 34a, 34b that is disposed between the plurality of drive points 32a, 32b and one exciter 33 and separately contacts the drive points 32a, 32b. 34.

  The bracket 34 has columnar contact portions 34a and 34b, a connecting portion 34c that connects these contact portions 34a and 34b, and an exciter mounting portion 34d provided on the connecting portion 34c.

In the bracket 34, the driving force of the exciter 33 is transmitted to the driving points 32a and 32b via the connecting portion 34c of the bracket 34 and the contact portions 34a and 34b. As a result, vibration is generated at the drive points 32a and 32b. In this case, the interval between the drive points 32a and 32b, that is, the interval between the contact portions 34a and 34b is an interval for generating divided vibration.

  According to this divided vibration generator 30, since the plurality of drive points 32a and 32b can be driven by one exciter 33, the number of parts and the cost can be reduced.

  When there are three or more drive points, a single bracket 34 can be provided with a plurality of contact portions corresponding to the number of drive points.

<< Third Embodiment >>
The present invention can be applied to various parts of a vehicle as will be described below. 5A and 5B show a case where the present invention is applied to a ceiling material 41 in an interior material of a vehicle 40. FIG. In the following description, the same parts as those in the first embodiment or the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The left and right door trims 42 of the vehicle 40 are each provided with two Lch or Rch speakers 43.

  Two exciters 12a and 12b are provided on the left and right sides of the ceiling member 41 so as to correspond to the left and right speakers 43, respectively. The exciters 12a and 12b are arranged with an interval B therebetween.

  The same signal is input to the exciters 12a and 12b according to the sound generated from the speaker 43 on the corresponding side. Thereby, a divided vibration is generated in the ceiling material 41, and a sound corresponding to the sound generated from the speaker 43 is generated from the ceiling material 41.

  FIGS. 6A and 6B show a case where the present invention is applied to the door trim 42 of the vehicle 40. The door trim 42 is provided with two speakers 43 on both the left and right sides. In the present embodiment, the exciters 12 a and 12 b are provided so as to correspond to the front speaker 43 provided on the door trim 42.

  The exciters 12a and 12b are arranged at a predetermined interval B. As a result, the door trim 42 vibrates and a sound corresponding to the sound generated from the speaker 43 is generated from the door trim 42.

  7A and 7B show a case where the present invention is applied to the package tray member 45 of the vehicle 40. FIG. The door trim 42 is provided with two speakers 43 on both the left and right sides. The package tray member 45 is provided with exciters 12a and 12b corresponding to the left and right speakers 43, respectively.

  These exciters 12a and 12b are arranged at a predetermined interval B. Thereby, a sound corresponding to the sound generated from the speaker 43 is generated from the package tray material 45.

  As described above, by applying the present invention to the interior material of the vehicle 40, the acoustic effect can be improved. In the above embodiment, the present invention is applied to any one of the ceiling material 41, the door trim 42, and the package tray material 45, but the present invention can be applied to two or more of these interior materials at the same time. The present invention can also be applied to interior materials other than those described above, such as pillar materials and instrument panels.

It is a figure explaining the divided vibration generating method of a 1st embodiment concerning the present invention. It is a figure explaining the vibration which generate | occur | produces in each drive point, and the amplitude of these synthetic vibration, when the space | interval of the drive point of 1st Embodiment which concerns on this invention is set to 1/4 of the wavelength in the vibration of a predetermined frequency. . It is a figure explaining the vibration which generate | occur | produces in each drive point, and the amplitude of these synthetic vibration, when the space | interval of the drive point of 1st Embodiment which concerns on this invention is set to 1/2 of the wavelength in the vibration of a predetermined frequency. . It is a figure which shows the divided vibration generator of 2nd Embodiment which concerns on this invention, and is a perspective view which shows the intermediate drive member which drives two drive points with one exciter. FIG. 5A is a plan view in which a split vibration generator is applied to a ceiling material of a vehicle according to a third embodiment of the present invention, and FIG. 5B is a cross-sectional view taken along line AA in FIG. FIG. 6A is a plan view in which a split vibration generator is applied to a door trim of a vehicle according to a third embodiment of the present invention, and FIG. 6B is a cross-sectional view taken along line BB in FIG. FIG. 7A is a plan view in which a split vibration generator is applied to a package tray of a vehicle according to a third embodiment of the present invention, and FIG. 7B is a cross-sectional view taken along the line C-C in FIG. It is a figure explaining the split vibration generation technique which concerns on a prior art example.

Explanation of symbols

11 Panel (plate member, diaphragm, body to be vibrated)
11a, 11b Driving point (vibration generation point)
12a, 12b exciter (vibration generating means)
20 Amplitude of vibration generated at one drive point 21 Amplitude of vibration generated at the other drive point 22 Amplitude of combined vibration 30 Divided vibration generator 31 Panel 32a, 32b Drive point (vibration generation point)
33 Exciter (vibration generating means)
34 Bracket (contact part)
34a, 34b Contact portion 34c Connecting portion 34d Exciter mounting portion 40 Vehicle 41 Ceiling material 42 Door trim 43 Speaker 45 Package tray 50 Plate member 50a Plate member center 50b Driving point 50c One vertex 51 Exciter

Claims (10)

Generate vibration by vibration generating means at a plurality of vibration generation points in the plate member,
A split vibration generating method, wherein the split vibration is generated in the plate member by interfering with vibrations generated from the plurality of vibration generation points.   2. The divided vibration generating method according to claim 1, wherein the vibration generating means is controlled by the same signal.   3. The divided vibration generating method according to claim 2, wherein the vibration generating means is controlled by the same phase.   4. The divided vibration generation according to claim 1, wherein an interval between the vibration generation points is 1/8 to ½ of a wavelength in vibration of a predetermined frequency generated at the vibration generation point. Method.   The divided vibration generating method according to claim 4, wherein an interval between the vibration generation points is ¼ or less of the wavelength.   The split vibration generating method according to claim 1, wherein the plate member is an interior material of a vehicle.   The split vibration generating method according to claim 6, wherein the interior material is at least one of a ceiling material, a door trim, a package tray, a pillar, and an instrument panel. Vibration generating means for generating vibration;
A contact portion connected to the vibration generating means and transmitting the vibration generated by the vibration generating means to a body to be vibrated;
The contact portion has a plurality of contact portions that come into contact with the vibrating body,
The divided vibration generator according to claim 1, wherein an interval between the plurality of contact portions is an interval for generating a divided vibration. A plate member;
Vibration generating means for generating vibration;
A contact portion connected to the vibration generating means and transmitting the vibration generated by the vibration generating means to the plate member;
The contact portion has a plurality of contact portions that come into contact with the plate member,
An interval between the plurality of contact portions is an interval for generating a divided vibration.   The split vibration generator according to claim 9, wherein the plate member is an interior material of a vehicle.

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