JP2020074635A - Damper and speaker device - Google Patents

Abstract

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

Description

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

  Conventionally, there has been proposed 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 (see, for example, Patent Document 1). In the conventional speaker device described in Patent Document 1, a restriction protrusion that prevents the voice coil bobbin from excessively moving is provided, and contact between the voice coil bobbin and other members is prevented.

Japanese Unexamined Patent Publication No. 11-262088

  By the way, generally, the damper surrounds the opening in order to stabilize the vibration direction of the voice coil bobbin and to suppress unnecessary natural vibration of the vibration system (diaphragm, damper, edge, etc.) to reduce noise. Has a corrugation portion formed in a concentric shape and having irregularities arranged in the radial direction. In such a damper, the sticking portion inside the corrugated 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 including 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 increases. It can be damaged.

  Therefore, a configuration is conceivable in which the entire damper is made of a material that is difficult to deform and the amplitude of the vibration system is suppressed when the voice coil bobbin tries to vibrate with an excessive input signal. However, such a damper reduces the amplitude of the vibration system even when there is no excessive input signal, lowers the sound pressure of the radiated sound with respect to the magnitude of the input signal, and lowers the efficiency of the speaker device. ..

  An object of the present invention is to provide a damper that can improve the efficiency of the speaker device while suppressing damage to the vibration system due to an excessive input signal, and a speaker device that includes 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 a radial direction, a flat portion formed around the corrugation portion and having a flat surface, and a sticking portion formed around the flat portion, the flat surface, It is characterized in that it extends substantially parallel to the sticking portion at a height different from the sticking portion in the plate thickness direction.

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

It is a perspective view showing a damper concerning Example 1 of an embodiment of the invention. It is a top view which shows the said damper. FIG. 3 is a sectional view taken along the line AA and a sectional view taken along the line BB in FIG. 2. It is CC sectional drawing in FIG. It is sectional drawing which shows a mode that the said damper deform | transformed. It is a schematic diagram which shows a mode that external force is applied to the said damper and a diaphragm, and displacement is measured. 7 is a graph showing the relationship between the external force applied to the damper and the displacement. 7 is a perspective view showing a damper according to Embodiment 2. FIG. FIG. 9 is a sectional view taken along line D-D in FIG. 8.

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

  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 corrugated portion. Therefore, if the voice coil bobbin tries to vibrate in the plate thickness direction due to an excessive input signal, the flat portion suppresses excessive deformation of the entire damper, reduces the amplitude of the vibration system, and damages the vibration system. Can be suppressed. Further, when there is no excessive input signal, the flat portion hardly disturbs the deformation of the corrugation portion according to the input signal, so that the sound pressure corresponding 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 (a 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 concentrates on the boundary between the flat surface and the sticking part, and the damper breaks near this boundary. It can be suppressed.

  It is preferable that the flat portion has one flat surface. Thereby, with a simple configuration, 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.

  It is preferable that the flat surface is provided on one side of the sticking portion in the plate thickness direction. The one side may be the sound emitting side of the speaker device or the opposite side.

  The flat portion preferably has a plurality of flat surfaces. Accordingly, the height of each flat surface in the plate thickness direction with respect to the attachment portion can be appropriately set, and the easiness of deformation of the flat portion can be adjusted. The plurality of flat surfaces may be arranged in parallel along the radial direction or may be arranged along the circumferential direction.

  It is preferable that the plurality of flat surfaces are arranged in parallel 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 suppress partial excessive deformation of the damper.

  It is preferable that the plurality of flat surfaces include a first flat surface and a second flat surface arranged at a different height from the first flat surface in the plate thickness direction. The first flat surface and the second flat surface may both be provided on the sound radiation side or the opposite side of the sticking part, or one may be provided on the sound radiation side and the other on the opposite side. It may be. 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 in the circumferential direction. Thereby, the easiness of deforming the flat portion can be easily adjusted as described above.

  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 an axis passing through a center of the opening and parallel to the plate thickness direction as an axis of symmetry. As a result, when the voice coil bobbin is vibrated in the thickness direction, the force applied from the voice coil bobbin to the damper becomes symmetrical with respect to the axis of symmetry, and the damper is prevented from being partially deformed excessively. The acoustic characteristics of the device can be improved. The plurality of flat surfaces may have rotational symmetry of two times or more.

  It is preferable to further include a connecting portion that connects 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 at different heights in the plate thickness direction by the connecting portion and can be maintained.

  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 toward the sound radiation side and the easiness of deformation toward the opposite side are the same, and good acoustic characteristics such as distortion can be maintained.

  Examples of the present invention will be specifically described below. In the second embodiment, the same constituent members as those described in the first embodiment and constituent members 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 a damper 1A according to a 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. 4] is a cross-sectional view showing a state where the damper 1A is deformed. The plate thickness direction, the radial direction, and the circumferential direction in this embodiment are as shown in FIGS.

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

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

  As shown in a cross-sectional view in FIG. 3, the corrugation portion 3 is composed of a plurality of (three in this embodiment) wavy concavities and convexities 31 juxtaposed in the radial direction, and has an annular shape surrounding the opening 2. Has been formed.

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

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

  The connecting portion 43 is provided between the first flat surface 41 and the second flat surface 42 that are adjacent to each other in the circumferential direction, and is inclined in the circumferential direction as shown in FIG. 4, which is a sectional view taken along the circumferential direction. The first flat surface 41 and the second flat surface 42 are connected to each other with 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. To do. The intermediate portion 432 is arranged at substantially the same height as the pasting portion 5 in the plate thickness direction (position indicated by a chain double-dashed line). 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. 3 (A), the rising portions 44 that sandwich the first flat surface 41 from the radial direction extend upward while being inclined in the radial direction from the corrugation portion 3 and the sticking portion 5, and the second flat surface 42 is radial. As shown in FIG. 3B, the rising portion 44 sandwiched from the direction extends downward from the corrugation portion 3 and the attachment portion 5 while being inclined in the radial direction. In this way, by providing the rising portion 44, the flat surface 40A is provided on a plane having a height different from that of the attaching 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 part 5 is formed to be flat and extends along the radial direction and the circumferential direction, and the lower surface in FIG. 1 is stuck to the frame of the speaker device as a sticking surface. That is, the damper 1A is provided in the speaker device with the upper surface as the sound radiation side.

  Hereinafter, how the damper 1A deforms will be described with reference to FIG. FIG. 5 shows a part of the damper 1A taken along the same position as in FIG. 3 (A). The damper 1A is also deformed in the same manner at the same position as in FIG.

  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 irregularities 31 becomes small, and the corrugation portions 3 of the concave and convex portions 31 and 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 flexibly deformed as compared with the corrugated portion 3.

  When the amplitude of the voice coil bobbin is large and the amount of extensional deformation of the corrugation portion 3 is sufficiently large, the corrugation portion 3 is less likely to be further deformed. On the other hand, the flat portion 4A is deformed so that the angle formed by the flat surface 40A and the attaching portion 5 is changed, and is changed so that the angle formed by the rising portion 44 and the flat surface 40A is changed. On the other hand, the flat surface 40A is maintained in almost the original shape. Since the corrugation portion 3 is less likely to be deformed and the flat surface 40A is less likely to be deformed as described above, 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 increased. Can be made smaller.

  On the other hand, in the conventional damper in which the corrugation portion is formed over the entire area between the opening portion and the sticking portion without the 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 vibration system may become too large, and the vibration system may be damaged.

  Also, in such a conventional damper, when the corrugation part near the sticking part is omitted and a flat surface extending in the same plane as the sticking part (at the same height in the plate thickness direction) is formed, excessive input When the voice coil bobbin vibrates due to a signal, excessive deformation of the 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 of breaking 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, the flat surface 40A hardly disturbs the deformation of the corrugation unit 3 due to the normal input signal, so that 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 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 near the boundary between the flat surface 40A and the sticking portion 5. It is possible to suppress breakage.

  Furthermore, since 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, the damper 1A is easily deformed to the sound radiation side. , And the easiness of deformation to the opposite side are the same, and good acoustic characteristics such as distortion can be maintained.

  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 symmetrical with respect to the symmetry axis, and Can be suppressed from being partially excessively deformed.

  Hereinafter, 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 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 portion and the sticking 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 material, and the material of the dampers 100 and 200 is chemical fiber or the like (the damper 200 of the comparative example is composed of a chemical fiber having a hardness higher than that of the damper 100 of the conventional example). As shown in Table 1, the dimensions of each part are shown in Table 1. The thickness is a plate thickness of the damper in a flat portion such as a sticking portion, and each of the dampers 1B, 100 and 200 has a substantially uniform thickness.

With respect to each of these dampers 1A, 100, 200, the displacement with respect to the 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, 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 cause the displacement measuring means 300 to move. 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 similarly to the voice coil bobbin was measured. The result is shown in FIG. 7. The displacement shown in FIG. 7 is an average value of the displacement when an external force is applied upward in FIG. 6 and the displacement when an external force is applied downward.

  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 damper 100 of the conventional example, 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, the displacement can be reduced in the region where the inclination is small and the external force is large, but 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 softer material than that of the conventional example, and the curve showing this damper 1A has a large inclination in the region where the external force is small and bends near 15N. , In a region where the external force is larger than this, there is a small inclination. In the damper 1A (1B) of the present embodiment (and the second embodiment described later), the displacement in the vertical direction is small when the external force is large, and thus a more flexible material can be used as compared with the conventional example.

  When the external force is small, the damper 1A has a larger displacement than the dampers 100 and 200 of the conventional example and the comparative example, and when the external force is large, the displacement can be smaller than that of 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 is provided with an opening 2 having one opening, a corrugation portion 3 formed around the opening 2 and having 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, the flat portion 4A being different from the sticking portion 5 in the plate thickness direction. Two heights, that is, a first flat surface 41 that extends substantially parallel to the attaching portion 5 in height, and a second flat surface 42 that is formed in parallel with the first flat surface 41 and is arranged at different heights in the plate thickness direction. However, 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 irregularities 31, a flat portion 4B having one flat surface 40B, and a sticking portion 5. , Is provided.

  The flat portion 4B includes a flat surface 40B formed in an annular shape as a whole, and a rising portion 44 provided so as to sandwich the flat surface 40B from the radial direction. The flat surface 40B is shown in cross section in FIG. In addition, it is arranged on one side (upper side) of the sticking portion 5 in the plate thickness direction.

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

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

  The present invention is not limited to the first and second embodiments, but includes other configurations and the like that can achieve the object of the present invention, and the following modifications and the like are also included in the present invention.

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

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

  Besides, the best configuration, method, and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited thereto. That is, the invention is mainly illustrated and described with respect to particular embodiments, but without departing from the scope of the technical idea and the object of the invention, the shape of the embodiments described above is different. Those skilled in the art can make various modifications in terms of material, quantity, and other detailed configurations. Therefore, the description limiting the shapes and materials disclosed above is described as an example for facilitating the understanding of the present invention, and does not limit the present invention. The description with the names of members excluding some or all of the above limitations is included in the present invention.

1A, 1B Damper 2 Opening part 3 Corrugation part 4A, 4B Flat part 5 Sticking part 31 Unevenness 40A, 40B Flat surface 41 First flat surface 42 Second flat surface 43 Connection part O opening

Claims (1)

An opening having one opening,
A corrugation portion formed around the opening and having at least one unevenness 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,
The damper, wherein the flat surface extends substantially parallel to the sticking portion at a height different from the sticking portion in the plate thickness direction.

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