JP2022027994A - Damper and speaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damper capable of improving the efficiency of a speaker device while suppressing the damage of a vibration system due to an excessive input signal, and a speaker device including the damper.

SOLUTION: Since a damper 1A has a flat surface 40A, the excessive deformation of a vibration system due to an excessive input signal can be suppressed, and the damage of the vibration system can be suppressed. Since the deformation of a corrugation part 3 due to a normal input signal is hardly prevented, the reduction of sound pressure of the speaker device to the input signal can be suppressed to improve the efficiency thereof. The deformation of a rising part 44 when a voice coil bobbin oscillates and the breakage of the damper 1A in the vicinity of a boundary between the flat surface 40A and the sticking part 5 are suppressed by extending the flat surface 40A at a height different from that of a sticking part 5 in the plate thickness direction.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a damper and a speaker device provided with the damper.

Conventionally, a speaker device including a frame, a voice coil bobbin, a diaphragm joined to the voice coil bobbin, and a damper for fixing the diaphragm to the frame has been proposed (see, for example, Patent Document 1). In the conventional speaker device described in Patent Document 1, a regulation protrusion for preventing the voice coil bobbin from moving excessively is provided, and contact between the voice coil bobbin and other members is prevented.

Japanese Unexamined Patent Publication No. 11-262808

By the way, the damper generally surrounds the opening in order to stabilize the vibration direction of the voice coil bobbin and suppress unnecessary natural vibration of the vibration system (diaphragm, damper, edge, etc.) to reduce noise. It has a corrugation portion that is formed concentrically and has irregularities arranged in the radial direction. In such a damper, the sticking portion inside the corrugation portion (around the opening) is joined to the voice coil bobbin, and the sticking portion outside is joined to the frame. In a speaker device equipped with such a damper, when an excessive input signal (for example, a signal due to noise) is input, the voice coil bobbin tries to vibrate accordingly, and the amplitude of the vibration system driven by the voice coil bobbin becomes large. It may be damaged.

Therefore, it is conceivable that the entire damper is made of a material that is not easily deformed, and the amplitude of the vibration system is suppressed when the voice coil bobbin tries to vibrate with an excessive input signal. However, with such a damper, the amplitude of the vibration system is reduced even in the absence of an excessive input signal, the sound pressure of the radiated sound with respect to the magnitude of the input signal is lowered, and the efficiency of the speaker device is lowered. ..

As an example, an object of the present invention is to provide a damper capable of improving the efficiency of the speaker device while suppressing damage to the vibration system due to an excessive input signal, and a speaker device provided with the damper.

In order to solve the above-mentioned problems and achieve the object, the damper of the present invention according to claim 1 has an opening having one opening and at least one unevenness formed around the opening. A corrugation portion arranged in the radial direction, a flat portion formed around the corrugation portion and having a flat surface, and a sticking portion formed around the flat portion are provided, and the flat surface is the flat surface. It is characterized in that it extends substantially parallel to the pasted portion at a height in the plate thickness direction different from that of the pasted portion.

On the other hand, the speaker device of the present invention is characterized by including the damper according to claim 1.

It is a perspective view which shows the damper which concerns on Example 1 of Embodiment of this invention. It is a top view which shows the damper. 2A is a cross-sectional view taken along the line AA and 2A is a cross-sectional view taken along the line BB in FIG. FIG. 2 is a sectional view taken along the line CC in FIG. It is sectional drawing which shows the appearance that the damper was deformed. It is a schematic diagram which shows the state of applying an external force to the damper and a diaphragm, and measuring the displacement. It is a graph which shows the relationship between the external force applied to the damper and the displacement. It is a perspective view which shows the damper which concerns on Example 2. FIG. FIG. 8 is a sectional view taken along the line DD of FIG.

Hereinafter, embodiments of the present invention will be described. The damper according to the embodiment of the present invention has an opening having one opening, a corrugation portion formed around the opening and having at least one unevenness arranged in the radial direction, and around the corrugation portion. A flat portion that is formed and has a flat surface and a sticking portion formed around the flat portion are provided, and the flat surface is the sticking portion at a height in a plate thickness direction different from that of the sticking portion. It is characterized by extending substantially in parallel with.

The flat portion of the damper has a flat surface. When a force in the plate thickness direction is applied to such a damper, the flat portion is less likely to be deformed than the corrugation portion. Therefore, when the voice coil bobbin tries to vibrate in the plate thickness direction due to an excessive input signal, excessive deformation of the entire damper is suppressed by having a flat portion, the amplitude of the vibration system becomes small, and the vibration system is damaged. Can be suppressed. Further, when there is no excessive input signal, the flat portion hardly hinders the deformation of the corrugation portion according to the input signal, so that the sound pressure with respect to the magnitude of the input signal can be secured.

Further, since the flat surface extends at a height in the plate thickness direction different from that of the sticking portion, a portion (rising portion) extending in the plate thickness direction is formed between the flat surface and the sticking portion. When the voice coil bobbin tries to vibrate in the plate thickness direction due to an excessive input signal, the rising part can be deformed, stress is concentrated on the boundary between the flat surface and the pasted part, and the damper breaks near this boundary. It is possible to prevent it from being stored.

The flat portion preferably has one flat surface. As a result, it is possible to secure the sound pressure with respect to the magnitude of the input signal while suppressing the damage of the vibration system due to the excessive input signal as described above by a simple configuration.

It is preferable that the flat surface is provided on one side in the plate thickness direction with respect to the sticking portion. It should be noted that this one side may be the sound radiating side in the speaker device or the opposite side.

The flat portion preferably has a plurality of the flat surfaces. Thereby, the height of each flat surface in the plate thickness direction with respect to the pasting portion can be appropriately set, and the ease of deformation of the flat portion can be adjusted. The plurality of flat surfaces may be arranged side by side along the radial direction or may be arranged side by side along the circumferential direction.

It is preferable that the plurality of flat surfaces are arranged side by side along the circumferential direction. As a result, the force applied to the damper by the voice coil bobbin becomes uniform in the radial direction, and it is possible to prevent the damper from being partially deformed excessively.

The plurality of flat surfaces preferably have a first flat surface and a second flat surface arranged at different heights in the plate thickness direction from the first flat surface. Both the first flat surface and the second flat surface may be provided on the sound emitting side or the opposite side of the pasting portion, or one is provided on the sound emitting side and the other is provided on the opposite side. It may have been. With such a configuration, the mechanical strength of the damper can be improved.

It is preferable that the first flat surface and the second flat surface are alternately arranged side by side in the circumferential direction. Thereby, as described above, the ease of deformation of the flat portion can be easily adjusted.

It is preferable that the opening is formed in a circular shape in a plan view, and the plurality of flat surfaces have rotational symmetry with the axis parallel to the plate thickness direction as the axis of symmetry while passing through the center of the opening. As a result, when the voice coil bobbin is vibrated in the plate thickness direction, the force applied from the voice coil bobbin to the damper becomes symmetric with respect to the axis of symmetry, suppressing the damper from being partially deformed excessively, and the speaker. The acoustic characteristics of the device can be improved. It should be noted that the plurality of flat surfaces may have rotational symmetry of two or more times.

It is preferable to further provide a connecting portion for connecting the flat surfaces adjacent to each other in the circumferential direction. Thereby, the flat surfaces adjacent to each other in the circumferential direction can be positioned and maintained at different heights in the plate thickness direction by the connecting portion.

It is preferable that the first flat surface is arranged on one side of the sticking portion in the plate thickness direction, and the second flat surface is arranged on the other side of the sticking portion in the plate thickness direction. .. As a result, the easiness of deformation of the damper to the sound radiation side and the easiness of deformation to the opposite side become the same, and the acoustic characteristics such as distortion can be kept good.

Hereinafter, examples of the present invention will be specifically described. In the second embodiment, the same components as those described in the first embodiment and the components having the same functions are designated by the same reference numerals as those in the first embodiment, and the description thereof will be omitted.

[Example 1]
1 is a schematic view showing the damper 1A according to the first embodiment of the present invention, FIG. 2 is a plan view showing the damper 1A, and FIGS. 3 and 4 are sectional views showing the damper 1A, FIG. 5 Is a cross-sectional view showing how the damper 1A is deformed. The plate thickness direction, radial direction, and circumferential direction in this embodiment are as shown in FIGS. 1 to 4.

The damper 1A is formed entirely in a plate shape by, for example, a cloth impregnated with a phenol resin, and has an opening O, a corrugation portion 3 formed around the opening 2, and a corrugation portion 3 around the damper 1A. A flat portion 4A formed and a sticking portion 5 formed around the flat portion 4A are provided and mounted on a speaker device (not shown).

The opening 2 is formed around an opening O having a circular shape in a plan view, and a cylindrical inner wall 21 is attached to a voice coil bobbin of a speaker device (not shown).

As shown in a cross section in FIG. 3, the corrugation portion 3 is composed of a plurality of corrugated irregularities 31 arranged side by side in the radial direction (three in each of the present embodiments), and has an annular shape surrounding the opening 2. It is formed.

The flat portion 4A has a plurality of (16 in this embodiment) flat surfaces 40A extending substantially parallel to the pasting portion 5 at a height in the plate thickness direction different from the pasting portion 5, and a connecting portion 43 connecting the flat surfaces 40A to each other. And the rising portions 44 provided at two places sandwiching the flat surface 40A from the radial direction.

The plurality of flat surfaces 40A are eight first flat surfaces 41 arranged on one side (upper side) in the plate thickness direction with respect to the pasting portion 5 as shown in a cross section in FIG. 3 (A), and FIG. 3 ( As shown in cross section in B), it has eight second flat surfaces 42 arranged on the other side (lower side) in the plate thickness direction from the pasting portion 5, and has a first flat surface 41 and a second. The flat surfaces 42 are arranged side by side alternately in the circumferential direction. Further, the plurality of flat surfaces 40A have rotational symmetry of eight-fold symmetry with the axis passing through the center of the opening O and parallel to the plate thickness direction as the axis of symmetry. That is, when the entire damper 1A is rotated around this axis of symmetry by a multiple of 45 °, the plurality of flat surfaces 40A overlap with the shape before rotation.

The connecting portion 43 is provided between the first flat surface 41 and the second flat surface 42 adjacent to each other in the circumferential direction, and is inclined in the circumferential direction as shown in FIG. 4, which is a cross-sectional view along the circumferential direction. A pair of inclined portions 431 extending in the plate thickness direction and an intermediate portion 432 provided between the pair of inclined portions 431 and extending in the circumferential direction are provided to connect the first flat surface 41 and the second flat surface 42. do. The intermediate portion 432 is arranged at substantially the same height as the pasting portion 5 (position indicated by the alternate long and short dash line) in the plate thickness direction. The connecting portion 43 may extend in the plate thickness direction without being inclined in the circumferential direction to connect the first flat surface 41 and the second flat surface 42, or the intermediate portion 432 may be omitted.

The rising portion 44 is provided between the flat surface 40A and the corrugation portion 3 and between the flat surface 40A and the sticking portion 5. As shown in FIG. 3A, the rising portion 44 that sandwiches the first flat surface 41 from the radial direction extends upward from the corrugation portion 3 and the sticking portion 5 while being inclined in the radial direction, and extends the second flat surface 42 in diameter. As shown in FIG. 3B, the rising portion 44 sandwiched from the direction extends downward from the corrugation portion 3 and the sticking portion 5 while being inclined in the radial direction. By providing the rising portion 44 in this way, the flat surface 40A is provided on a plane having a height different from that of the sticking portion 5 in the plate thickness direction. The rising portion 44 may have a shape that extends along the plate thickness direction without being inclined.

The sticking portion 5 extends along the radial direction and the circumferential direction and is formed flat, and the lower surface in FIG. 1 is stuck to the frame of the speaker device as the sticking surface. That is, the damper 1A is provided in the speaker device with the upper surface as the sound emitting side.

Hereinafter, how the damper 1A is deformed will be described with reference to FIG. FIG. 5 shows a part of the damper 1A cross-sectioned at the same position as in FIG. 3 (A). The damper 1A is deformed in the same manner as in the following even at the same position as in FIG. 3B.

When the amplitude of the voice coil bobbin is small, as shown by the solid line in FIG. 5, in the corrugation portion 3 of the damper 1A, the height of the corrugated uneven portion 31 becomes small, and the concave portion and the convex portion constituting the concave-convex 31 respectively. It stretches and deforms so that the interval becomes longer. Further, the flat portion 4A of the damper 1A is deformed so that the angle formed by the rising portion 44 and the flat surface 40A changes. On the other hand, the flat surface 40A is less likely to be deformed and bent as compared with the corrugation portion 3.

When the amplitude of the voice coil bobbin is large and the amount of elongation deformation of the corrugation portion 3 becomes sufficiently large, the corrugation portion 3 is less likely to be deformed further. On the other hand, the flat portion 4A is deformed so that the angle formed by the flat surface 40A and the sticking portion 5 changes, and the flat portion 4A is deformed so that the angle formed by the rising portion 44 and the flat surface 40A changes. On the other hand, the flat surface 40A is kept substantially in its original shape. In this way, the corrugation portion 3 is less likely to be deformed and the flat surface 40A is less likely to be deformed. Therefore, even if the voice coil bobbin vibrates due to an excessive input signal, excessive deformation of the entire damper 1A is suppressed, and the amplitude of the vibration system is suppressed. Can be made smaller.

On the other hand, in a conventional damper in which a corrugation portion is formed over the entire space between the opening and the sticking portion without a flat portion, when the voice coil bobbin vibrates due to an excessive input signal, the entire damper is greatly expanded and deformed. As a result, the amplitude of the vibrating system may become too large and the vibrating system may be damaged.

Further, in such a conventional damper, when the corrugation portion near the pasting portion is omitted and a flat surface extending on the same plane as the pasting portion (at the same height in the plate thickness direction) is formed in this portion, an excessive input is made. When the voice coil bobbin vibrates due to the signal, excessive deformation of this damper can be suppressed as in the damper 1A of the first embodiment, but the force is concentrated on the boundary between the flat surface and the sticking portion, and the damper is near this boundary. There is a possibility that it will break at.

With the above configuration, since the damper 1A has the flat surface 40A, excessive deformation of the vibration system due to an excessive input signal can be suppressed, and damage to the vibration system can be suppressed. Further, since the flat surface 40A hardly hinders the deformation of the corrugation portion 3 due to the normal input signal, the sound pressure with respect to the magnitude of the input signal can be secured, and the efficiency of the speaker device can be improved.

Further, since the flat surface 40A extends at a height different from that of the sticking portion 5 in the plate thickness direction, the rising portion 44 is deformed when the voice coil bobbin vibrates, and the damper 1A is located near the boundary between the flat surface 40A and the sticking portion 5. It is possible to suppress the breakage.

Further, the first flat surface 41 is arranged on one side of the sticking portion 5 and the second flat surface 42 is arranged on the other side of the sticking portion 5, so that the damper 1A is easily deformed to the sound radiation side. , And the easiness of deformation to the opposite side are the same, and acoustic characteristics such as distortion can be kept good.

Further, since the plurality of flat surfaces 40A have rotational symmetry, when the voice coil bobbin is vibrated in the plate thickness direction, the force applied from the voice coil bobbin to the damper 1A becomes symmetric with respect to the axis of symmetry, and the damper. Can be prevented from being partially excessively deformed.

Hereinafter, the displacements of the damper 1A of the first embodiment, the damper 100 of the conventional example, and the damper 200 of the comparative example with respect to an external force will be described based on the experimental results. Here, the damper 100 of the conventional example has the same inner diameter (opening diameter) and outer diameter as the damper 1A of the present embodiment, and a corrugation portion is formed over the entire space between the opening and the pasting portion. Is. Further, the damper 200 of the comparative example has substantially the same shape as the damper 100 of the conventional example, and is made of a material that is less likely to be deformed than the damper 100 of the conventional example.

Here, the material of the damper 1A is cotton or a blended spinning material, and the materials of the dampers 100 and 200 are chemical fibers or the like (the damper 200 of the comparative example is composed of chemical fibers having a higher hardness than the damper 100 of the conventional example). As a whole, each part is formed in a circular shape, and the dimensions of each part are shown in Table 1. The thickness is the plate thickness dimension of the damper in a flat portion such as a pasting portion, and each damper 1B, 100, 200 has a substantially uniform thickness as a whole.

For each of these dampers 1A, 100, and 200, the displacement with respect to an external force was measured by the displacement measuring means 300 as shown in FIG. That is, one end of each of the dampers 1A, 100, and 200 is connected to the displacement measuring means 300 and the other end is fixed, and an external force in the vertical direction (plate thickness direction) is applied to the displacement measuring means 300 to obtain the displacement measuring means 300. The magnitude of the displacement was measured. That is, the displacement of the displacement measuring means 300 when the displacement measuring means 300 was vibrated in the same manner as the voice coil bobbin was measured. The result is shown in FIG. The displacement shown in FIG. 7 is an average value of the displacement when an external force is applied upward and the displacement when an external force is applied downward in FIG.

In the damper 100 of the conventional example and the damper 200 of the comparative example, the displacement is substantially proportional to the external force. In the conventional damper 100, the displacement can be secured even if the inclination is large and the external force is small, but the displacement becomes too large in the region where the external force is large. On the other hand, in the damper 200 of the comparative example, although the displacement can be reduced in the region where the inclination is small and the external force is large, the displacement becomes too small in the region where the external force is small. On the other hand, the damper 1A of the present embodiment uses a material that is more flexible than that of the conventional example, and the curve showing the damper 1A has a large inclination in the region where the external force is small and bends in the vicinity of 15N. , It has a small inclination in the region where the external force is larger than this. In the damper 1A (1B) of this embodiment (and the second embodiment described later), since the displacement in the vertical direction is small when the external force is large, a more flexible material can be used as compared with the conventional example.

When the external force is small, the damper 1A has a large displacement as compared with the dampers 100 and 200 of the conventional example and the comparative example, and when the external force is large, the displacement can be reduced as compared with the damper 100 of the conventional example. Therefore, the speaker device equipped with the damper 1A is more efficient than the speaker device equipped with the dampers 100 and 200 of the conventional example and the comparative example. Further, the vibration system is less likely to be damaged as compared with the speaker device equipped with the damper 100 of the conventional example.

In the first embodiment, the damper 1A has an opening 2 having one opening, a corrugation portion 3 formed around the opening 2 and at least one unevenness arranged in the radial direction, and the corrugation portion 3. A flat portion 4A formed around the flat portion 4A and having a flat surface 40A, and a sticking portion 5 formed around the flat portion 4A, and the flat portion 4A has a plate thickness direction different from that of the sticking portion 5. Two heights, a first flat surface 41 extending substantially parallel to the sticking portion 5 in height, and a second flat surface 42 formed parallel to the first flat surface 41 and arranged at different heights in the plate thickness direction. Although the one having only the flat surface arranged in parallel is described, the flat portion may further have another flat surface having a height different from that of the first flat surface 41 and the second flat surface 42. ..

[Example 2]
As shown in FIG. 8, the damper 1B according to the second embodiment includes an opening 2 having an opening O, a corrugation portion 3 having an unevenness 31, a flat portion 4B having one flat surface 40B, and a pasting portion 5. , Equipped with.

The flat surface 4B includes a flat surface 40B formed entirely in an annular shape and a rising portion 44 provided by sandwiching the flat surface 40B from the radial direction, and the flat surface 40B is shown in a cross section in FIG. Is arranged on one side (upper side) in the plate thickness direction with respect to the sticking portion 5.

With the above configuration, it is possible to suppress damage to the vibration system due to an excessive input signal and improve the efficiency of the speaker device, as in the first embodiment.

Further, since the flat portion 4B has one flat surface 40B, the configuration can be simplified as compared with the flat portion 4A having a plurality of flat surfaces 40 as in the first embodiment.

The present invention is not limited to the above-mentioned Examples 1 and 2, and includes other configurations and the like that can achieve the object of the present invention, and the present invention also includes modifications and the like as shown below.

For example, in the first embodiment, the plurality of flat surfaces 40 have a first flat surface 41 provided on one side in the plate thickness direction with respect to the sticking portion 5, and a second flat surface 42 provided on the other side. However, the plurality of flat surfaces may have three or more types of flat surfaces arranged at different heights in the plate thickness direction. Further, the plurality of flat surfaces may extend substantially parallel to the pasting portion at a height different from the pasting portion in the plate thickness direction, and may be provided on one side or the other side of the pasting portion, for example.

Further, in the first embodiment, the 16 flat surfaces 40 (8 first flat surfaces 41 and 8 second flat surfaces 42) have eight rotational symmetries, but a plurality of flat surfaces. If the surface has rotational symmetry more than once, the same effect as that of the first embodiment can be obtained. Further, for example, a plurality of flat surfaces may be asymmetrically formed as long as the flat portion is formed so as not to be sufficiently deformed and the partial deformation of the damper is suppressed.

In addition, the best configuration, method, and the like for carrying out the present invention are disclosed in the above description, but the present invention is not limited thereto. That is, the present invention is primarily illustrated and described with respect to a particular embodiment, but without departing from the scope of the technical idea and object of the present invention, with respect to the embodiments described above. Various modifications can be made by those skilled in the art in terms of material, quantity, and other detailed configurations. Therefore, the description limiting the shapes, materials, etc. disclosed above is merely an example for facilitating the understanding of the present invention, and does not limit the present invention. Therefore, those shapes, materials, etc. The description by the name of the member excluding a part or all of the limitation such as is included in the present invention.

1A, 1B damper 2 opening 3 corrugation part 4A, 4B flat part 5 pasting part 31 unevenness 40A, 40B flat surface 41 first flat surface 42 second flat surface 43 connection part O opening

Claims (1)

An opening with one opening and
A corrugation portion formed around the opening and having at least one unevenness arranged in the radial direction, and a corrugation portion.
A flat portion formed around the corrugation portion and having a flat surface,
With a sticking portion formed around the flat portion,
The damper is characterized in that the flat surface extends substantially parallel to the sticking portion at a height in the plate thickness direction different from that of the sticking portion.

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