Speaker attachment structure

Abstract

To provide a speaker attachment structure capable of realizing suppression of a vibration transmission from a speaker and an improvement of an attachment rigidity.SOLUTION: A speaker attachment structure in which a speaker having a flange part is fixed to a plate member having a fixing hole comprises a reinforcement control member that suppresses vibration transmission from the speaker and reinforces an attachment rigidity. The reinforcement control member includes: a reinforce part that is interposed to between the flange part of the speaker and a fixing hole circumference part of the plate member; and a plate-thickness change part that is extended to a shaft side of the speaker of the reinforcement part. In the plate-thickness change part, a plate-thickness is reduced in an extension direction; its tip end forms a free end; and it is formed of a paramagnetic material, a diamagnetic material, or an antiferromagnetic material. A control vibration material is provided to its tip end part. The following relation is satisfied where the plate thickness of the plate-thickness change part is h(x)=ε*xn+hO (x is a distance (mm) from the tip end; h(x) is a plate thickness (mm) in the distance x from the tip end; hO is a thickness (mm) of the tip end; ε is a positive constant number; and n is an actual value of one or more).SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a speaker mounting structure, and more particularly to a speaker mounting structure that can suppress the transmission of vibration from a speaker to a plate member and improve the mounting rigidity of the speaker. [Background technology]

[0002] Patent Document 1 discloses a simple speaker mounting structure that can suppress the generation of noise due to high frequency sounds while ensuring high mounting rigidity. This speaker mounting structure includes a strong fastening portion that fastens the speaker to a portion of the vehicle body panel that has a relatively low rigidity, and a loose fastening portion that fastens the speaker with a lower fastening force than the strong fastening portion, with an elastic body interposed between the speaker and the portion of the vehicle body panel that has a relatively high rigidity. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-208433 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the speaker mounting structure disclosed in Patent Document 1 still has an elastic material such as rubber between the speaker and the vehicle body panel. Therefore, although the transmission of vibration from the speaker to the vehicle body panel is suppressed, the mounting rigidity of the speaker is reduced and is not sufficient.

[0005] The present invention has been made in consideration of the problems associated with such conventional technology, and aims to provide a speaker mounting structure that can suppress the transmission of vibration from the speaker to the board member and improve the mounting rigidity of the speaker. [Means for solving the problem]

[0006] As a result of extensive research into achieving the above-mentioned objective, the inventors discovered that the above-mentioned objective could be achieved by providing a configuration that includes a specified vibration compensation member that suppresses the transmission of vibrations from the speaker and reinforces the mounting rigidity, and thus completed the present invention.

[0007] That is, the speaker mounting structure of the present invention is a speaker mounting structure in which a speaker having a flange portion is fixed to a plate member having a fixing hole. The speaker mounting structure includes a vibration compensation member that suppresses the transmission of vibration from the speaker and reinforces the mounting rigidity. The vibration compensating member has a reinforcing portion interposed between the flange portion of the speaker and the peripheral portion of the fixing hole of the plate member, and a plate thickness changing portion extending on the speaker shaft side of the reinforcing portion. The thickness changing portion has a thickness that decreases in the extending direction, its tip forms a free end, is made of a paramagnetic material, a diamagnetic material or an antiferromagnetic material, and has a vibration damping material at its tip. The thickness of the plate at the plate thickness change part is calculated by the following formula (1). h(x)=ε x n +h O (1) (In formula (1), x is the distance from the tip (mm), h(x) is the plate thickness at the distance x from the tip (mm), and h O is the tip thickness (mm), ε is a positive constant, and n is a real number equal to or greater than 1. Effect of the Invention

[0008] According to the present invention, since the configuration is provided with the above-mentioned vibration compensation member that suppresses the transmission of vibrations from the speaker and reinforces the mounting rigidity, it is possible to provide a speaker mounting structure that can suppress the transmission of vibrations from the speaker to the plate member and improve the mounting rigidity of the speaker. [Brief description of the drawings]

[0009] [Figure 1] 1 is a partial cross-sectional view showing a speaker mounting structure according to an embodiment of the present invention; [Diagram 2]13A and 13B are explanatory diagrams illustrating a vibration compensation member used in a speaker mounting structure according to another embodiment of the present invention; [Diagram 3] 2 is an explanatory diagram illustrating a vibration compensation member used in the speaker mounting structure shown in FIG. 1; [Figure 4] 6 is a graph showing the effect of suppressing vibration transmission from a speaker to a door inner panel by a vibration compensating member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The speaker mounting structure of the present invention will be described in detail below with reference to the drawings. Note that the dimensional ratios of the drawings cited below are exaggerated for the convenience of explanation and may differ from the actual ratios.

[0011] As shown in Fig. 1, the speaker mounting structure 1 of this embodiment is a speaker mounting structure in which a speaker 10 having a flange portion 10A is fixed to a plate member 20 having a fixing hole 20a. Here, an example of the plate member 20 is a door inner panel, which is an automobile part. In the speaker mounting structure 1 shown in the figure, the speaker 10 and the plate member 20 are fastened together by a bolt 40.

[0012] The speaker mounting structure 1 includes a vibration compensation member 30 that suppresses the transmission of vibration from the speaker 10 to the plate member 20 and reinforces the mounting rigidity of the speaker 10.

[0013] The vibration compensating member 30 has a reinforcing portion 31 interposed between the flange portion 10A of the speaker 10 and the fixing hole peripheral portion 20A of the plate member 20, and a plate thickness changing portion 33 extending from the reinforcing portion 31 on the speaker axis a side.

[0014] The thickness-changing portion 33 decreases in thickness in the extending direction of the thickness-changing portion 33, and its tip 33a forms a free end, and has a vibration-damping material 35 made of a viscoelastic material such as butyl rubber at the tip 33A of the thickness-changing portion 33. Although not shown, the thickness-changing portion 33 is made of a paramagnetic material, a diamagnetic material, or an antiferromagnetic material.

[0015] The upper view of FIG. 2 is a plan view showing a vibration compensation member used in a speaker mounting structure of another embodiment, and the lower view of FIG. 2 is a cross-sectional view of the vibration compensation member shown in the upper view of FIG. 2, cut along the line A-A' in the upper view of FIG. 2. The upper view of FIG. 3 is a perspective view showing a vibration compensation member used in the speaker mounting structure shown in FIG. 1, and the lower view of FIG. 3 is a cross-sectional view of the vibration compensation member shown in the upper view of FIG. 3, cut along the same position as the line A-A' in the upper view of FIG. 2. Although not shown in the lower views of FIG. 2 and FIG. 3, the fixing hole peripheral portion 20A of the plate member 20 is disposed above the reinforcing portion 31, and the flange portion 10A of the speaker 10 is disposed below the reinforcing portion 31. FIG. 1 is a cross-sectional view of the speaker mounting structure provided with the vibration compensation member shown in FIG. 3, cut along the line A''-A' in FIG. 1.

[0016] As shown in Fig. 2, in the vibration compensating member used in the speaker mounting structure of the present invention, the thickness of the thickness changing portion 33 in the vibration compensating member 30' used in the speaker mounting structure of another embodiment satisfies the relationship expressed by the following formula (1). Note that the thickness of the thickness changing portion 33 in the vibration compensating member 30 used in the speaker mounting structure 1 shown in Fig. 1 also satisfies the relationship expressed by the following formula (1).

[0017] h(x)=ε x n +h O (1) (In formula (1), x is the distance from the tip 33a (mm), h(x) is the plate thickness at the distance x from the tip 33a (mm), and h O is the thickness of the tip 33a (mm), ε is a positive constant, and n is a real number equal to or greater than 1.

[0018] As shown in Figures 1 and 3, it is preferable that the vibration compensation member 30 is formed by bending near the boundary between the reinforcing portion 31 and the thickness-changing portion 33. It is also preferable that the thickness-changing portion 33 extends linearly. The bending angle when the vibration compensation member 30' shown in Figure 2 is made into the vibration compensation member 30 shown in Figures 1 and 3 is 45° (see Figure 3). The bending angle mentioned above may be such that the member is bent to such an extent that it does not come into contact with other portions, and is, for example, 45°.

[0019] As shown in Fig. 3, it is preferable that the thickness-changing portion 33 has a plurality of thickness-changing pieces 33B1-33B8 arranged along the circumferential direction of the fixing hole 20a. When the vibration-compensating member 30' shown in Fig. 2 is made into the vibration-compensating member 30 shown in Figs. 1 and 3, the thickness-changing portion 33 may be cut into eight equal parts along the two-dot chain lines shown in Fig. 2, for example, and then the above-mentioned bending process may be performed. In addition to cutting into eight equal parts, it is also possible to cut into six or ten equal parts.

[0020] As shown in Fig. 1, the thickness-changing portion 33 is inclined toward the rear of the speaker 10 in the front-to-rear direction of the speaker 10 indicated by the arrow Z in Fig. 1, and it is preferable that the tip 33a of the thickness-changing portion 33 is at the same position as the rear end 10a of the speaker 10 in the front-to-rear direction or is further forward than the rear end 10a of the speaker 10. Note that reference numeral 50 in Fig. 1 indicates the door window when it is open. Although not shown, there is a door outer panel behind the door window 50 in the front-to-rear direction of the speaker 10.

[0021] Next, the advantages of this embodiment will be described. In this embodiment, the vibration compensation member 30 has a reinforcing portion 31 interposed between the flange portion 10A of the speaker 10 and the fixing hole peripheral portion 20A of the plate member 20, and a plate thickness change portion 33 extending toward the speaker axis a side of the reinforcing portion 31, having the above-mentioned shape and material, and having a vibration-damping material 35 at the tip portion 33A. Since the plate thickness of the plate member is apparently increased by the reinforcing portion, the second moment of area can be increased and the mounting rigidity of the speaker can be improved. Furthermore, since the plate thickness change portion is made of a paramagnetic material, a diamagnetic material, or an antiferromagnetic material that does not generate an attractive force due to the magnet of the speaker, and can be made into a free end having the above-mentioned shape that produces an acoustic black hole effect, an acoustic black hole effect is produced and the transmission of vibration from the speaker to the plate member is suppressed. In addition, since the transmission of vibration from the speaker to the plate member is suppressed, it is also possible to improve the acoustic quality of the speaker. Furthermore, it is possible to suppress the vibration of door inner panels and the like that are made of thin plates and are prone to vibration.

[0022] Furthermore, according to a preferred embodiment of the present invention, the vibration compensating member is formed by bending the vicinity of the boundary between the reinforcing portion and the thickness-changing portion, so that the above-mentioned structure can be manufactured by simple processing.

[0023] Furthermore, according to a preferred embodiment of the present invention, the thickness changing portion has a plurality of thickness changing pieces arranged circumferentially around the fixing hole, so that the structure described above can be produced by simple processing.

[0024] Furthermore, according to a preferred embodiment of the present invention, the thickness-changing portion is inclined toward the rear of the speaker in the fore-and-aft direction of the speaker, and the tip of the thickness-changing portion is at the same position as the rear end of the speaker in the fore-and-aft direction or is further forward than the rear end of the speaker, thereby preventing interference with other components such as the door window when the speaker is open.

[0025] Next, the materials, specifications, etc. of the components in the above-described embodiment will be described in detail.

[0026] The speaker, the plate member, and the bolts fastening them may be, for example, a conventionally known speaker, a conventionally known door inner panel, a reinforced interior panel, and conventionally known bolts fastening them. The material of the flange of the speaker is usually plastic. The flange of the speaker usually has a shape that extends with a uniform length overall, but may have a shape that extends with a part protruding. The material of the door inner panel is usually steel or an aluminum alloy.

[0027] The reinforcing portion of the vibration compensation member only needs to be able to reinforce the plate member, and for example, it is preferable that the flexural rigidity of the reinforcing portion is greater than the flexural rigidity of the plate member. In addition, it is preferable that the reinforcing portion of the vibration compensation member has a uniform plate thickness from the viewpoint of smooth vibration transmission from the speaker to the vibration compensation member and easy fixing of the speaker to the plate member. The plate thickness changing portion of the vibration compensation member is made of a paramagnetic material, a diamagnetic material, or an antiferromagnetic material, but from the viewpoint of easy processing, it is preferable that the reinforcing portion of the vibration compensation member is made of the same material. Here, an example of the paramagnetic material is aluminum. In addition, an example of the diamagnetic material is gold, silver, or copper. Furthermore, an example of the antiferromagnetic material is SUS304. EXAMPLES

[0028] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

[0029] Example 1 First, a vibration compensation member made of SUS304 as shown in Fig. 2 was produced by cutting. Here, in the reinforcing portion 31, the outer diameter was Φ182 mm, the inner diameter was Φ125 mm, and the plate thickness was 1 mm, and in the plate thickness changing portion 33, the outer diameter was Φ125 mm, the inner diameter was 37 mm, and the plate thickness changed from 1 mm to 0.2 mm from the end on the reinforcing portion 31 side toward the tip 33a. Here, the plate thickness of the plate thickness changing portion was calculated by h(x) = 0.8 / (44) 2 x 2 The relationship satisfies +0.2.

[0030] Next, the thickness changed portion 33 was cut into eight equal parts along the two-dot chain lines in FIG. 2, to form thickness changed portion pieces 33B1 to 33B8.

[0031] Furthermore, the cut side of the regular octagon was bent at 45° using the eight sides as folding lines, and then a rubber sheet was attached as vibration-damping material 35 to the tip portion 33A to produce the vibration-compensating member used in this example as shown in Figure 3.

[0032] The obtained vibration compensation member was provided on the speaker mounting structure to obtain the speaker mounting structure of this example as shown in FIG.

[0033] [Evaluation of vibration transmission] First, to simulate free support, the right front door of an E12 Note manufactured by Nissan Motor Co., Ltd. was placed on the sponge with the door outer panel facing downward. At this time, the vibration compensation member obtained in Example 1 was attached to the speaker mounting structure as shown in FIG. 1. Next, white noise of 20 to 8000 Hz was generated from the speaker with an applied voltage of 1.0 V. At this time, the acceleration (m / s 2 The transfer function (m / s 2 / V) was calculated. The obtained results are shown in Fig. 4. The solid line in Fig. 4 shows the result of Example 1 in which a vibration compensation member was provided in the speaker mounting structure, and the dashed line in Fig. 4 shows the result of Comparative Example 1 in which a vibration compensation member was not provided in the speaker mounting structure.

[0034] From Figure 4, it can be seen that, except for some frequency bands below 1000 Hz, the speaker mounting structure equipped with the vibration compensation member has a lower transfer function and is less likely to transmit vibrations to the door inner panel.

[0035] Although the present invention has been described above with reference to some embodiments, the present invention is not limited to these, and various modifications are possible within the scope of the gist of the present invention.

[0036] In the present invention, in order to suppress the transmission of vibrations from the speaker to the plate member and improve the mounting rigidity of the speaker, the main feature is that the vibration-compensating member has a reinforcing section interposed between the flange portion of the speaker and the peripheral portion of the fixing hole of the plate member, and a plate-thickness-changing section extending toward the speaker shaft of the reinforcing section, which has the above-mentioned shape and material, and has a vibration-damping material at its tip.

[0037] Therefore, in the above-mentioned embodiment, the speaker, the plate member, and the vibration compensation member are fastened by bolts, but the present invention is not limited to this. In the present invention, for example, the flange and the reinforcing portion, and the reinforcing portion and the plate member may be fixed with an adhesive. In addition, in the above-mentioned embodiment, the rubber sheet is used as the vibration damping material, but the present invention is not limited to this. In the present invention, for example, a plate member having a smaller Young's modulus than the plate thickness change portion may be provided so as to protrude beyond the tip of the plate thickness change portion.

[0038] Furthermore, the components described above are not limited to those described above, and it is possible to change the details of the specifications and materials of the speaker, plate member, and vibration compensation member, and it is also possible to delete preferred components of one embodiment, or to replace or combine preferred components of one embodiment with preferred components of another embodiment. [Explanation of symbols]

[0039] 1. Speaker mounting structure 10 Speaker 10A Flange part 10a rear end 20 Plate material (door inner panel) 20A Fixing hole area 20a fixing hole 30,30' Vibration compensation member 31 Reinforcement 33 Thickness change area 33A Tip 33B1~33B8 Plate thickness change piece 33a tip 35 Damping material 40 Volts 50 Door Window

Claims

1. A speaker mounting structure in which a speaker having a flange portion is fixed to a plate member having a fixing hole, a vibration compensation member for suppressing vibration transmission from the speaker and reinforcing mounting rigidity; the vibration compensation member has a reinforcing portion interposed between the flange portion of the speaker and the peripheral portion of the fixing hole of the plate member, and a plate thickness changing portion extending toward the speaker shaft side of the reinforcing portion, The thickness changing portion has a thickness decreasing in an extension direction, a tip thereof forms a free end, and is made of a paramagnetic material, a diamagnetic material, or an antiferromagnetic material, and has a vibration damping material at the tip thereof; The thickness of the plate thickness changing portion is expressed by the following formula (1). h(x)=ε・x ｎ +h Ｏ ・・・(1) (In formula (1), x is the distance from the tip (mm), h(x) is the plate thickness at the distance x from the tip (mm), and h Ｏ is the thickness (mm) of the tip, ε is a positive constant, and n is a real number equal to or greater than 1. A speaker mounting structure comprising:

2. 2. The speaker mounting structure according to claim 1, wherein the vibration compensation member is formed by bending a portion near a boundary between the reinforcing portion and the thickness-changing portion.

3. 3. The speaker mounting structure according to claim 1, wherein the thickness-changing portion has a plurality of thickness-changing pieces arranged in a circumferential direction of the fixing hole.

4. The plate thickness changing portion is inclined toward the rear side of the speaker in the front-rear direction of the speaker, The tip of the plate thickness changing portion is located at the same position as the rear end of the speaker in the front-rear direction or is located forward of the rear end of the speaker.

3. The speaker mounting structure according to claim 1 or 2.

5. The plate thickness changing portion is inclined toward the rear side of the speaker in the front-rear direction of the speaker, The tip of the plate thickness changing portion is located at the same position as the rear end of the speaker in the front-rear direction or is located forward of the rear end of the speaker.

4. The speaker mounting structure according to claim 3.

6. 2. The speaker mounting structure according to claim 1, wherein the plate member is an automobile part.

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