JP6340682B2 - Speaker and speaker housing - Google Patents

Description

  The present invention relates to a speaker having a double wall structure and a speaker housing applied to the speaker.

  In general, a speaker includes a speaker unit that vibrates air in accordance with an input electrical signal and emits a sound wave (hereinafter referred to as “forward wave”) forward, and a housing that supports the speaker unit. The housing is disposed behind the speaker unit in order to prevent an unnecessary sound wave (hereinafter referred to as “rear wave”) having an opposite phase to the forward wave radiated behind the speaker unit from interfering with the forward wave. It is shaped to shield the space.

  However, in such a speaker, a back wave radiated from the rear of the speaker unit vibrates due to pressure fluctuation in the space inside the housing, and is further excited by vibration in the space, so that the wall surface of the housing is Vibrate. Then, when the wall surface of the housing vibrates, the air outside the housing vibrates and the sound wave propagates outside the housing. When propagation of sound waves through such a case occurs, a sound wave radiated from the case to the outside interferes with a forward wave radiated in front of the speaker unit.

  Regarding this problem, a method of suppressing the vibration of the wall surface of the housing by increasing the rigidity by making the wall portion of the housing extremely thick can be considered. However, this method has another problem that the weight of the housing is significantly increased.

  Therefore, in Patent Documents 1 and 2, the propagation of sound waves through the housing is provided by providing a vacuum sealed space for suppressing the propagation of vibration between the inner wall portion and the outer wall portion of the housing having a double wall structure. There has been proposed a speaker that suppresses noise. These speakers can suppress the propagation of sound waves through the casing without significantly increasing the weight of the casing.

Japanese Utility Model Publication No. 63-15691 JP 2003-92791 A

  In the case of the double wall structure, a sealed space exists between the inner wall portion and the outer wall portion. Therefore, it is possible to suppress the vibration perpendicular to the inner wall portion excited by the backward wave from propagating to the outer wall portion through this sealed space. However, the double-walled housing has vibration that propagates to the outer wall portion without passing through the sealed space. Specifically, the vibration of the inner wall portion excited by the backward wave propagates from the inner wall portion to the outer wall portion through the connecting portion between the inner wall portion and the outer wall portion (hereinafter referred to as “wraparound propagation vibration”), This vibration is directly propagated from the speaker unit to the housing through the contact portion between the speaker unit and the housing (hereinafter referred to as “direct propagation vibration”), and the outer wall portion vibrates due to these vibrations. .

  As described above, it is difficult to sufficiently suppress the vibration of the outer wall portion simply by making the housing a double wall structure. For this reason, in a double-walled housing, it is necessary to suppress vibration propagating along the wall surfaces of the inner wall portion and the outer wall portion. In addition, vibrations propagating along the inner wall and outer wall of the double wall structure include longitudinal waves (dense waves) that are parallel to the propagation direction and vibrations that are perpendicular to the propagation direction. There is a certain shear wave. Of these, the longitudinal wave is a vibration that is parallel to the wall surface, and it is difficult to vibrate the air around the wall surface. However, the transverse wave is a vibration that is perpendicular to the wall surface, and is a major cause of generating sound waves outside the housing by vibrating the air around the wall surface.

  In this respect, the speaker proposed in Patent Document 1 suppresses vibration propagating to the outer wall portion by providing an elastic body for absorbing vibration on the vibration propagation path from the speaker unit to the outer wall portion. Yes. However, in this speaker, since it is necessary to provide an elastic body at the joint between the outer wall portion and the inner wall portion in order to suppress the swaying propagation vibration, there is a high risk of breaking the vacuum in the sealed space due to impact or deterioration over time. (Refer to FIG. 2 of Patent Document 1).

  Moreover, in the structure provided with the enclosure fixing reinforcing material such as the speaker proposed in Patent Document 2, the suppression of vibration (particularly direct propagation vibration) in the outer wall portion is insufficient. Therefore, in the speaker of this structure, in order to suppress the adverse effect on the sound wave caused by the vibration of the outer wall portion, a design case for providing a sound absorbing material on the outer side of the outer wall portion and further holding the sound absorbing material on the outer side is provided. It becomes essential to provide the speaker, and the structure of the speaker becomes unnecessarily large and complicated. Therefore, from the viewpoint of downsizing and simplifying the structure of the speaker, it is possible to suppress the vibration generated in the outer wall portion in advance rather than excluding the adverse effect on the sound wave caused by the vibration generated in the outer wall portion. It can be said that it is preferable to adopt a simple structure.

  Accordingly, an object of the present invention is to provide a speaker and a speaker housing that suppresses propagation of sound waves through the housing by suppressing both sneak propagation vibration and direct propagation vibration with a simple structure. To do.

In order to achieve the above object, the present invention provides a speaker including a speaker unit and a housing, wherein the housing has an inner wall portion that is partially open and has a space inside, and a portion that is open. An outer wall portion in which the inner wall portion is disposed in a space on the inside, and the opened end portions of the inner wall portion and the outer wall portion are integrated to form a peripheral edge portion, and the inner wall portion and It is a double wall structure in which the space between the outer wall portions is a sealed space, and at least a part of the speaker unit is separated from the peripheral edge portion in a direction toward the inner space of the inner wall portion at the inner wall portion. As the shape of the peripheral portion, which is supported by screwing, in the cross section perpendicular to the opening surface having the peripheral portion as the outer periphery is in the direction opposite to the direction toward the space inside the inner wall portion, The inner wall and front The outer wall portion is provided a speaker which comprises a V-shape asymptotic.

  According to this speaker, the speaker unit comes into contact with the inner wall portion in a direction having a direction component perpendicular to the inner wall portion. Therefore, it is possible to provide a region in the inner wall portion where the impedance is large with respect to the direction having the direction component perpendicular to the inner wall portion and the transverse wave is difficult to propagate toward the outer wall portion. Therefore, by being excited by the backward wave of the speaker unit, it is possible to suppress the sneak propagation vibration that is mainly a transverse wave.

  In addition, the vibration in the direction perpendicular to the inner wall (that is, the transverse wave) easily propagates to the inner wall because the impedance of the inner wall is relatively small, and the vibration in the direction parallel to the inner wall (that is, the longitudinal wave) is Since the impedance of the inner wall portion is relatively large, it is difficult to propagate to the inner wall portion. Here, when the speaker unit is screwed into the inner wall portion, the main vibration direction of the speaker unit (that is, the direction of radiating forward waves) approaches a direction parallel to the inner wall portion. As a result, the directly propagating vibration propagating from the speaker unit to the inner wall portion mainly becomes a longitudinal wave. However, since the longitudinal wave hardly propagates to the inner wall portion as described above, the directly propagating vibration can be reduced. Therefore, direct propagation vibration can be suppressed.

  In addition, even if a longitudinal wave propagates to the outer wall as sneak propagation vibration or direct propagation vibration, since the longitudinal wave hardly vibrates the air around the outer wall, the sound wave emitted from the outer wall is extremely small. It becomes. Furthermore, even if a part of the longitudinal wave changes to a transverse wave while propagating to the outer wall part, the vibration energy is reduced at the time of the change, so that the sound wave emitted from the outer wall part is extremely small. Become.

  Moreover, according to this speaker, it becomes possible to make a speaker unit detachable with respect to a housing | casing. Therefore, it becomes possible for the user to selectively combine desired ones from various speaker units and cases having different characteristics, and obtain a speaker having characteristics that match his / her preference.

Further, according to this speaker, it is possible to arbitrarily adjust the support state of the speaker unit by the housing. For example, by increasing the screwing amount of the speaker unit, the volume (air volume) of the space behind the speaker unit and surrounded by the inner wall portion can be reduced, or the screwing amount of the speaker unit can be reduced. Thus, the volume of the space can be increased. And by performing such adjustment, it becomes possible to change the resonance state of the speaker unit.
Further, according to this speaker, the peripheral portion has a shape that bends sharply, so that vibration hardly passes through the peripheral portion. Therefore, it becomes possible to suppress sneak propagation vibration and direct propagation vibration. And from a viewpoint of suppressing the passage of vibration, it is preferable that the peripheral portion has a shape that bends into a V shape at an acute angle.

  Furthermore, in the speaker having the above characteristics, as the outer diameter of a screw thread provided on the speaker unit and screwed into the inner wall portion is directed from the space inside the inner wall portion toward the opening surface having the outer peripheral portion as an outer periphery, Increasing gradually is preferable.

  According to this speaker, the speaker unit is pressed against the inner wall portion according to the screwing of the speaker unit. That is, as the speaker unit is screwed, stress along the direction having a direction component perpendicular to the inner wall is applied to the inner wall. Therefore, it is possible to effectively suppress the sneak propagation vibration.

  Moreover, in the speaker having the above characteristics, the shape of the peripheral portion in a cross section perpendicular to the opening surface is a V-shape that protrudes outside the space surrounded by the inner wall portion and the outer wall portion and is folded back. ,preferable.

  In the speaker having the above characteristics, it is preferable that a shape of the peripheral edge in a cross section perpendicular to the opening surface is a V-shape bent only once.

  In the speaker having the above characteristics, it is preferable that the shape of the peripheral portion in a cross section perpendicular to the opening surface is a V shape bent at an angle smaller than 70 °.

  According to these speakers, it is possible to effectively suppress the passage of vibrations at the peripheral portion.

  In the speaker having the above characteristics, the speaker unit includes a diaphragm, a driving unit that drives and vibrates the diaphragm according to an input electric signal, and a unit support unit that supports at least the driving unit, The unit support portion may be supported by being screwed into the inner wall portion.

  Furthermore, in the speaker having the above characteristics, when the direction from the opening surface having the outer periphery as the outer periphery toward the space inside the inner wall portion is the rear, and the opposite direction to the rear is the front, at least a part of the unit support portion However, it is preferable that the diaphragm is supported by being screwed into the inner wall portion at a position behind the front end portion of the diaphragm.

  According to this speaker, the distance between the screwing position of the unit support portion and the inner wall portion and the peripheral edge portion can be increased. Therefore, it becomes possible to effectively suppress the sneak propagation vibration by increasing the distance for attenuating the sneak propagation vibration.

  Further, in the speaker having the above characteristics, when the direction from the opening surface having the outer periphery as the outer periphery toward the space inside the inner wall portion is the rear, and the opposite direction to the rear is the front, the front end of the speaker unit The part may be located in front of the peripheral edge.

  In this speaker, since the speaker unit is present in front of the peripheral portion, a part of the forward wave radiated from the speaker unit is unnecessarily reflected or scattered by the peripheral portion, so that the normal wave is radiated. Interference can be prevented. Moreover, since the said interference can be avoided, it becomes possible to make the shape of a peripheral part into arbitrary shapes (especially shape suitable in order to suppress a wraparound propagation vibration and a direct propagation vibration).

  Furthermore, in the speaker having the above characteristics, it is preferable that an outer edge of the speaker unit extends to the front of the peripheral portion and is separated from the peripheral portion.

  According to this speaker, since the outer edge of the speaker unit does not come into contact with the peripheral portion, direct propagation vibration can be effectively suppressed.

  Moreover, the speaker of the said characteristic WHEREIN: The said inner wall part may be a bottomed cylinder shape, and the axial center of the said inner wall part may pass through the opening surface which makes the said peripheral part an outer periphery.

  Further, in the speaker having the above characteristics, a stepped portion that protrudes into the inner space is provided on the inner wall portion, and an end portion of the speaker unit that is inserted into the inner space of the inner wall portion is the stepped portion. It is preferable that the speaker unit is screwed onto and supported by the inner wall portion while being in contact with the portion.

  According to this speaker, it is possible to easily determine the position of the speaker unit in the space inside the inner wall portion.

  Further, in the speaker having the above characteristics, each of a screw thread provided on the speaker unit and screwed into the inner wall part and a screw thread provided on the inner wall part and screwed into the speaker unit are screwed. The speaker unit has a flank inclined with respect to a plane perpendicular to the direction, and the end of the speaker unit inserted into the space inside the inner wall is in contact with the step. Is preferably supported by the inner wall.

  According to this speaker, by bringing the speaker unit into contact with the stepped portion (particularly, strongly fastening and pressing), the fastening direction from the stepped portion to the speaker unit is opposite to the fastening direction (parallel to the screwing direction). Stress in a direction from the space inside the inner wall portion toward the opening surface is applied. Then, a stress in a direction perpendicular to the flank is applied from the thread flank on the speaker unit side to the thread flank on the inner wall side in contact with the flank. At this time, since the flank of the thread on the inner wall side is inclined with respect to a plane perpendicular to the screwing direction (that is, a plane perpendicular to the inner wall), the stress is a directional component perpendicular to the inner wall. (Direction component that presses the inner wall portion outward). Therefore, it is possible to effectively suppress the sneak propagation vibration.

  In the speaker having the above characteristics, it is preferable that an air pressure in the sealed space between the inner wall portion and the outer wall portion is lower than an atmospheric pressure.

  According to this speaker, it is possible to suppress vibration propagating from the inner wall portion to the outer wall portion via the sealed space. Further, when the sealed space between the inner wall portion and the outer wall portion becomes negative pressure, the inner wall portion is pulled toward the outer wall portion, so that stress is applied to the inner wall portion. For this reason, it is possible to effectively suppress the sneak propagation vibration.

In addition, the present invention includes an inner wall portion that is partially open and has a space inside, and an outer wall portion that is partially open and in which the inner wall portion is disposed inside the space, and the inner wall portion Each of the open end portions of the outer wall portion is integrated to form a peripheral portion, and a space between the inner wall portion and the outer wall portion forms a sealed space, and at least a part of the speaker unit is formed. A support structure for screwing and supporting the inner wall portion at a position spaced from the peripheral edge portion to the side opposite to the end portion side is provided on the inner wall portion, and the peripheral edge portion of the peripheral edge portion is provided. A speaker housing comprising a V-shape in which the inner wall portion and the outer wall portion gradually approach as the shape in a cross-section perpendicular to the opening surface having an outer periphery extends toward the end side. provide.

  In the speaker having the above characteristics and the speaker housing having the above characteristics, the speaker unit is supported by being screwed to the inner wall portion, and by suppressing both the wraparound propagation vibration and the direct propagation vibration, Propagation of sound waves through the housing can be suppressed.

1 is a schematic perspective view of a speaker according to an embodiment of the present invention. Sectional drawing which shows the AA cross section of FIG. The disassembled perspective view of the speaker of FIG. Sectional drawing shown about 1st Example of the speaker which concerns on embodiment of this invention. Sectional drawing shown about 2nd Example of the speaker which concerns on embodiment of this invention. Sectional drawing shown about 3rd Example of the speaker which concerns on embodiment of this invention. The side view shown about an experiment method. The side view shown about the shape of each sample. The graph shown about the measurement result of the vibration in the sample V. FIG. The graph shown about the measurement result of the vibration in the sample U. FIG. The graph shown about the result of the vibration in the sample C. FIG. The graph shown about the measurement result of the vibration in sample reverse S. FIG. The graph shown about the measurement result of the vibration in the sample S. FIG. The graph shown about the attenuation degree of each sample (plate thickness: 0.5 mm) shown in FIG. The graph shown about the attenuation degree of each sample (plate thickness: 1.0 mm) shown in FIG. The side view shown about the shape of each sample. The graph shown about the attenuation degree of each sample (plate thickness: 0.5 mm) shown in FIG. 17 is a graph showing the attenuation of each sample (plate thickness: 1.0 mm) shown in FIG. Sectional drawing shown about 4th Example of the speaker which concerns on embodiment of this invention. Sectional drawing shown about 5th Example of the speaker which concerns on embodiment of this invention. The perspective view which shows an example of the manufacturing method of the housing | casing for speakers which concerns on embodiment of this invention. The perspective view which shows an example of the manufacturing method of the housing | casing for speakers which concerns on embodiment of this invention. The perspective view which shows an example of the manufacturing method of the housing | casing for speakers which concerns on embodiment of this invention. Sectional drawing of the housing | casing for speakers manufactured by the manufacturing method shown to FIGS.

<Basic configuration>
First, a basic configuration of a speaker according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view of a speaker according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. FIG. 3 is an exploded perspective view of the speaker of FIG.

  As shown in FIGS. 1 to 3, the speaker 1 includes a speaker unit 10 and a housing 20. The speaker unit 10 emits sound waves by vibrating air in accordance with an input electric signal. The housing 20 supports the speaker unit 10.

  1 to 3, the direction in which the speaker unit 10 is provided when viewed from the housing 20 is the front (upward direction in FIGS. 1 to 3), and the housing 20 is disposed when viewed from the speaker unit 10. The direction is the rear (downward direction in FIGS. 1 to 3).

  The speaker unit 10 includes a diaphragm 11, a drive unit 12, a unit support unit 13, and an edge unit 14.

  The diaphragm 11 has a thin plate shape and is made of an elastic material such as resin, paper, or metal. The diaphragm 11 is supported by one end of the diaphragm 11 connected to the drive unit 12 and the other end connected to the edge unit 14. Further, the diaphragm 11 is provided with a center cap 111 so as to cover the drive unit 12. The center cap 111 may be made of the same material as that of the diaphragm 11 or may be made of a material different from that of the diaphragm 11.

  The drive part 12 is the structure provided with the magnet and the coil, for example. The drive unit 12 is driven forward and backward so that the diaphragm 11 connected to the drive unit 12 reciprocates with an electromagnetic force generated according to an input electric signal. Thereby, the diaphragm 11 (including the center cap 111) vibrates, and a sound wave (front wave) is emitted toward the front of the diaphragm 11, and a sound wave (rear wave) is directed toward the rear of the diaphragm 11. Is emitted.

  The unit support portion 13 is a frame of the speaker unit 10 and is made of, for example, resin or metal. Inside the unit support part 13, the diaphragm 11, the drive part 12, and the edge part 14 are arrange | positioned, respectively. Moreover, the unit support part 13 supports the drive part 12 and the edge part 14, respectively. Here, a part of the rear end portion of the unit support portion 13 is opened, and the drive portion 12 is supported by the remaining portion. Therefore, the backward wave radiated from the diaphragm 11 enters the space inside the housing 20.

  The edge portion 14 has a thin film shape and is made of a flexible material such as cloth or urethane. The edge portion 14 is connected to the other end of the diaphragm 11 whose one end is connected to the drive unit 12, so that the space in front of the diaphragm 11 is separated from the space in the rear.

  The housing 20 includes an inner wall portion 21 that is partially open and has a space inside, and an outer wall portion 22 that is partially open and in which the inner wall portion 21 is disposed in a space that is inside. The opened end portions of the inner wall portion 21 and the outer wall portion 22 are integrated to form a peripheral edge portion 23. Thereby, the housing | casing 20 becomes a double wall structure from which the space between the inner wall part 21 and the outer wall part 22 becomes a sealed space. The peripheral edge 23 is the frontmost end of the housing 20.

  Here, a surface having the periphery 23 as an outer periphery is defined as an opening surface 24. At this time, the direction from the opening surface 24 toward the space inside the inner wall portion 21 is the rear, and the opposite direction is the front.

  1-3, the inner wall 21 and the outer wall 22 have a bottomed cylindrical shape (more specifically, a cylinder whose one end opens and the other end closes to become the bottom) The axial centers of the inner wall portion 21 and the outer wall portion 22 pass through the opening surface 24 (more specifically, the cylindrical shaft center and the opening surface 24 intersect perpendicularly). Moreover, the AA cross section shown in FIG. 2 is a cross section (namely, cross section perpendicular | vertical to the opening surface 24) which passes along the axial center of the inner wall part 21 and the outer wall part 22. As shown in FIG.

  The casing 20 is made of a metal material such as an iron-based material (for example, a steel material such as stainless steel), an aluminum-based material, a magnesium-based material, a titanium-based material, a copper-based material (for example, brass), or a material containing gold or silver. Can be applied. Also, resin materials such as CFRP (Carbon Fiber Reinforced Plastic), GFRP (Glass Fiber Reinforced Plastic), Soarnol (registered trademark), X-BARRIER (registered trademark), and inorganic materials other than metal materials such as glass and ceramics It is also possible to apply. Furthermore, for example, a composite material in which a gas barrier film and a base material (for example, a resin material) are combined is also applicable. In addition, although materials other than these may be applied as the material forming the housing 20, it is preferable to apply a material having a property capable of suppressing vibration, such as a material having high rigidity.

  In the speaker 1, at least a part of the speaker unit 10 is supported by being screwed into the inner wall portion 21. Specifically, for example, the thread 131 provided on the outer surface of the unit support part 13 inserted into the space inside the inner wall part 21 and the thread 211 provided on the inner wall part 21 are screwed together. Thus, the speaker unit 10 is fixed to and supported by the inner wall portion 21. At this time, the flank 1311 of the thread 131 provided on the speaker unit 10 and the flank 2111 of the thread 211 provided on the inner wall 21 come into contact with each other. The “flank” is a surface that connects the top and bottom of the screw thread. Further, at least a part of the unit support portion 13 is supported by being screwed into the inner wall portion 21 at a position behind the front end portion (end portion connected to the edge portion 14) of the diaphragm 11. .

  Further, the front end portion of the speaker unit 10 is located in front of the peripheral edge portion 23. Furthermore, the outer edge of the speaker unit 10 extends to the front of the peripheral edge 23 and is separated from the peripheral edge 23.

  In the speaker 1 of this example, the speaker unit 10 comes into contact with the inner wall portion 21 in a direction having a directional component perpendicular to the inner wall portion 21. Therefore, a region where impedance is large with respect to a direction having a direction component perpendicular to the inner wall portion 21 and a transverse wave hardly propagates toward the outer wall portion 22 (in this example, a region where the unit support portion 13 contacts by screwing). Can be provided on the inner wall 21. Therefore, by being excited by the backward wave of the speaker unit 10, it is possible to suppress the sneak propagation vibration that is mainly a transverse wave.

  In addition, vibration in a direction perpendicular to the inner wall portion 21 (that is, a transverse wave) easily propagates to the inner wall portion 21 because the impedance of the inner wall portion 21 is relatively small, and vibration in a direction parallel to the inner wall portion 21 (that is, longitudinal vibration). Is not easily propagated to the inner wall 21 because the impedance of the inner wall 21 is relatively large. Here, when the speaker unit 10 is screwed and brought into contact with the inner wall portion, the main vibration direction of the speaker unit 10 (that is, the direction of radiating forward waves) approaches a direction parallel to the inner wall portion 21. As a result, the direct propagation vibration propagating from the speaker unit 10 to the inner wall portion 21 mainly becomes a longitudinal wave. However, since the longitudinal wave is difficult to propagate to the inner wall portion 21 as described above, the direct propagation vibration can be reduced. It becomes. Therefore, direct propagation vibration can be suppressed.

  In addition, even if a longitudinal wave propagates to the outer wall portion 22 as a sneak propagation vibration or a direct propagation vibration, since the longitudinal wave is difficult to vibrate the air around the outer wall portion 22, the sound wave emitted from the outer wall portion 22 is It will be extremely small. Furthermore, even if a part of the longitudinal wave changes to a transverse wave while propagating to the outer wall portion 22, the vibration energy is reduced at the time of the change, so that the sound wave emitted from the outer wall portion is extremely small. It becomes.

  As described above, the speaker 1 according to the embodiment of the present invention has a simple structure in which the speaker unit 10 is supported by being screwed to the inner wall portion 21, and suppresses both sneak propagation vibration and direct propagation vibration. This makes it possible to suppress the propagation of sound waves through the housing 20.

  Further, as described above, when the speaker unit 10 is screwed onto and supported by the inner wall portion 21, the speaker unit 10 can be attached to and detached from the housing 20. Therefore, the user can selectively combine desired ones from various speaker units 10 and housings 20 having different characteristics to obtain the speaker 1 having characteristics that match his / her preference. Here, the characteristics of the speaker unit 10 and the housing 20 include characteristics relating to sound quality (for example, the material of the diaphragm 11 and the capacity of the space behind the speaker unit 10 and surrounded by the inner wall portion 21 (air volume). ) And the like, and appearance characteristics such as color and shape are also included.

  Further, when the speaker unit 10 is screwed onto and supported by the inner wall portion 21, the support state of the speaker unit 10 by the housing 20 can be arbitrarily adjusted. For example, by increasing the screwing amount of the speaker unit 10, the volume of the space (air volume) behind the speaker unit 10 and surrounded by the inner wall portion 21 can be reduced, or the screwing amount of the speaker unit 10 can be reduced. By reducing the value, the volume of the space can be increased. Then, by performing such adjustment, the resonance state of the speaker unit 10 can be changed.

  Further, in the speaker 1, the distance between the screw positions near the rear of the unit support portion 13 and the inner wall portion 21 and the peripheral edge portion 23 can be increased. Therefore, it becomes possible to effectively suppress the sneak propagation vibration by increasing the distance for attenuating the sneak propagation vibration.

  Furthermore, since the speaker unit 10 is present in front of the peripheral portion 23 in the speaker 1, a part of the forward wave radiated from the speaker unit 10 is reflected or scattered unnecessarily by the peripheral portion 23. Interference with the radiated forward wave can be prevented. Moreover, since the said interference can be avoided, it becomes possible to make the shape of the peripheral part 23 into arbitrary shapes (especially shape suitable for suppressing a wraparound propagation vibration and a direct propagation vibration). Furthermore, in the speaker 1, since the outer edge of the speaker unit 10 does not contact the peripheral portion 23, it is possible to effectively suppress direct propagation vibration.

  2 and 3 exemplify a structure in which each of the screw thread 131 and the screw thread 211 is formed for three rounds, a structure in which the screw threads 131 and 211 are formed for one or two rounds. It is good also as a structure formed more than 4 times. Further, the numbers of the threads 131 and 211 may be different. 2 and 3 exemplify the case where each of the screw threads 131 and 211 has a single and continuous shape, the screw threads 131 and 211 may be cut in the middle. Alternatively, a multiple spiral shape in which a plurality of wires are twisted in parallel may be used.

  Further, the structure of the speaker 1 may be any structure as long as the speaker unit 10 is supported by being screwed to the inner wall portion 21.

<Example>
Next, various embodiments with various modifications will be described with reference to the drawings based on the speaker 1 having the basic configuration described above. In the following, description of the same parts as the basic configuration described above will be omitted, and only characteristic parts in the respective embodiments will be described. In addition, each embodiment to be described later can be implemented by arbitrarily combining each characteristic portion.

[First embodiment]
4 is a cross-sectional view showing a first example of the speaker according to the embodiment of the present invention, and shows a cross-section corresponding to the cross-section shown in FIG. 2 (A-A cross-section, see FIG. 1).

  As shown in FIG. 4, in the speaker 1 </ b> A of this example, the screw threads 132 provided on the outer surface of the unit support portion 13 and the screw threads provided on the inner wall portion 21 are the same as the speaker 1 having the basic configuration described above. The speaker unit 10 is fixed to and supported by the inner wall portion 21 by being screwed together. At this time, the flank 1321 of the screw thread 132 provided on the speaker unit 10 and the flank 2121 of the screw thread 212 provided on the inner wall 21 come into contact with each other.

  However, in the speaker 1 </ b> A of this example, the outer diameter of the thread 132 on the speaker unit 10 side gradually increases from the space inside the inner wall portion 21 toward the opening surface 24. Further, in the speaker 1A of the present example, the inner diameter of the thread 212 on the inner wall 21 side is also adjusted from the space inside the inner wall 21 toward the opening surface 24 in accordance with the outer diameter of the thread 132 on the speaker unit 10 side. , Get bigger gradually.

  As described above, when the outer diameter of the thread 132 on the speaker unit 10 side is gradually increased from the space inside the inner wall portion 21 toward the opening surface 24, the speaker unit 10 follows the screwing of the speaker unit 10. It is pressed against the inner wall 21. That is, as the speaker unit 10 is screwed, stress along the direction having a directional component perpendicular to the inner wall portion is applied to the inner wall portion 21. Therefore, it is possible to effectively suppress the sneak propagation vibration.

[Second Embodiment]
FIG. 5 is a cross-sectional view showing a second example of the speaker according to the embodiment of the present invention, and shows a cross section corresponding to the cross section shown in FIG. 2 (cross section AA, see FIG. 1).

  As shown in FIG. 5, in the speaker 1 </ b> B of the present example, the inner wall portion 21 is provided with a neck portion 213 (stepped portion) that protrudes toward the inner space. The speaker unit 10 is supported by the inner wall portion 21 in a state where the end portion of the speaker unit 10 inserted into the space inside the inner wall portion 21 is in contact with the neck portion 213.

  However, in the speaker 1B of the present example, each of the screw threads 131 and 211 has a thick valley side and a thin mountain side, and is inclined with respect to a plane perpendicular to the screwing direction (vertical direction in the figure). It shall have. Specifically, for example, it is preferable that the screw threads 131 and 211 are screw threads in a triangular screw or a trapezoidal screw.

  As described above, when the neck portion 213 is provided on the inner wall portion 21, the position of the speaker unit 10 in the space inside the inner wall portion 21 can be easily determined. Further, by providing the neck portion 213, it is possible to prevent a part of the unit support portion 13 located in front of the peripheral portion 23 from coming into contact with the peripheral portion 23 due to the screwing of the speaker unit 10. Therefore, it is possible to suppress direct propagation vibration.

  Further, when the speaker unit 10 is brought into contact with the neck portion 213 (stepped portion) (particularly, strongly tightened and pressed), the fastening direction from the neck portion 213 to the speaker unit 10 is opposite to the fastening direction (parallel to the screwing direction). In the direction from the space inside the inner wall portion 21 toward the opening surface 24 (upward in the figure)). Then, stress in a direction perpendicular to the flank 2111 is applied from the flank 1311 of the screw thread 131 on the speaker unit 10 side to the flank 2111 of the screw thread 211 on the inner wall 21 side that is in contact with the flank 1311. . At this time, since the flank 2111 of the thread 211 on the inner wall 21 side is inclined with respect to a surface perpendicular to the screwing direction (that is, a surface perpendicular to the inner wall 21), the stress is applied to the inner wall 21. Direction component (direction component pressing the inner wall portion 21 outward). Therefore, it is possible to effectively suppress the sneak propagation vibration.

  The neck portion 213 (stepped portion) protrudes into the space inside the inner wall portion 21 so that it can abut against the end of the speaker unit 10 inserted into the space inside the inner wall portion 21 (ie, the inner wall portion 21 inside the space). , The above-mentioned effects can be obtained. Therefore, the neck portion 213 (stepped portion) may have any shape as long as the above-described effects can be obtained. For example, the inner diameter of the rear portion of the inner wall portion 21 is smaller than the inner diameter of the front portion (in other words, the shape of the neck portion 213 extending to the rear and reaching the bottom surface of the inner wall portion 21). There may be. Further, for example, the neck portion 213 (stepped portion) may be provided on the entire inner circumference of the inner wall portion 21 or may be provided partially on the inner side of the inner wall portion 21. Also good.

  In addition, when the neck portion 213 (stepped portion) is provided in the same manner as the speaker 1B of the present example with respect to the speaker 1A of the first embodiment (see FIG. 4), It is possible to effectively reduce the sneak propagation vibration.

[Third embodiment]
6 is a cross-sectional view showing a third example of the speaker according to the embodiment of the present invention, and shows a cross-section corresponding to the cross-section shown in FIG. 2 (A-A cross-section, see FIG. 1).

  As shown in FIG. 6, in the speaker 1 </ b> C of this example, the shape of the peripheral portion 231 in a cross section perpendicular to the opening surface 24 (AA cross section, see FIG. 1) is V-shaped. Specifically, for example, the peripheral edge portion 231 has a shape in which the inner wall portion 21 and the outer wall portion 22 asymptotically approach the front (upward in the drawing).

  As described above, when the peripheral edge portion 231 has a shape that bends sharply, vibration hardly passes through the peripheral edge portion 231. Therefore, it is possible to suppress vibration propagating from the inner wall portion 21 to the outer wall portion 22. At this time, from the viewpoint of effectively suppressing the passage of vibration, it is preferable that the peripheral edge portion 23 is bent into an acute shape and bent into a V shape as illustrated in FIG.

  The peripheral edge portion 231 having such a shape is arranged so that the end portions of the inner wall portion 21 and the outer wall portion 22 are in contact with each other with a predetermined angle as shown in FIG. It is possible to form the end portions by joining the end portions by welding or brazing.

  Moreover, you may form the inner wall part 21 and the outer wall part 22 integrally about the peripheral part 231 by what kind of method. Specifically, for example, one or both of the inner wall portion 21 and the outer wall portion 22 are bent so that the respective end portions approach each other, and the contacted end portions are joined by welding, brazing, or the like to form the peripheral edge portion 231. May be.

  Further, an experiment was conducted to verify the effect of suppressing the passage of vibration by the V-shaped peripheral edge portion 231 described above. The results of this experiment will be described below with reference to the drawings.

  FIG. 7 is a side view showing the experimental method. As shown in FIG. 7, the experiment conducted this time was performed by fixing one end of a plate-like sample having a bent central portion, and applying an impact to the fixed end, and both sides sandwiching the central portion. Are measured by strain gauges SG1 and SG2, respectively. Here, the bent central portion of the sample corresponds to the peripheral portion, the fixed end portion (hereinafter referred to as inner side) to which an impact is applied corresponds to the inner wall portion, and the opposite side (hereinafter referred to as outer side) corresponds to the outer wall. It corresponds to the part.

  Each sample used in this experiment is produced only by bending without performing welding or the like in order to confirm the effect of suppressing the passage of vibration caused only by the shape of the peripheral edge. In addition, the length of the sample between the strain gauges SG1 and SG2 is 100 mm regardless of the shape of the sample, and the strain gauges SG1 and SG2 are arranged at positions equidistant from the center of the sample. The width of each sample is 10 mm, and the plate thickness of the sample is two types of 0.5 mm and 1.0 mm.

  FIG. 8 is a side view showing the shape of each sample. As shown in FIG. 8, there are five types of sample shapes used in this experiment. The sample shown in FIG. 8A is a V-shaped sample (hereinafter referred to as “sample V”) having a central portion bent at an acute angle (20 ° in this example). The sample shown in FIG. 8B is a U-shaped sample (hereinafter referred to as “sample U”) that is bent into a curved surface without being bent at the center. The sample shown in FIG. 8C is a C-shaped sample (hereinafter referred to as “sample C”) that is bent at 90 ° at two locations of an inner portion and an outer portion of the central portion. The sample shown in FIG. 8D is an inverted S-shaped sample (hereinafter referred to as “sample inverted S”) in which the inner portion of the central portion is bent at an acute angle and the outer portion is bent into a concavo-convex shape in a curved shape. . The sample shown in FIG. 8E is an S-shaped sample (hereinafter referred to as “sample S”) in which the outer portion of the central portion is bent at an acute angle and the inner portion is bent into a concavo-convex shape in a curved shape.

  FIG. 9 is a graph showing the measurement results of vibration in the sample V. FIG. 10 is a graph showing a measurement result of vibration in the sample U. FIG. 11 is a graph showing a measurement result of vibration in the sample C. FIG. 12 is a graph showing the measurement results of vibration in the sample reverse S. FIG. FIG. 13 is a graph showing the measurement results of vibration in the sample S. In each of FIGS. 9 to 13, the graph of (a) shows the measurement result of the strain gauge SG1 (measurement result of vibration inside), and the graph of (b) shows the measurement result of the strain gauge SG2 ( (Measurement results of vibration on the outside).

  In each of FIGS. 9 to 13, the graphs shown in (a) and (b) define the time when the vibration reaches the strain gauge SG1 as 0, and the maximum displacement in the measurement result of the strain gauge SG1 is 1. It is standardized so that Further, in each of FIGS. 9 to 13, a broken line connecting the displacement peaks in the graph of (a) (that is, a line indicating temporal fluctuation of the amplitude on the inner side) is shown in the graphs of (a) and (b). it's shown. The graphs shown in FIGS. 9 to 13 show the measurement results of vibration in a sample having a plate thickness of 0.5 mm.

  In the graphs shown in FIGS. 9 to 13, the effect of suppressing the passage of vibration due to the shape of the sample is particularly strong immediately after the occurrence of vibration (for example, from about 0 to about 0.2 seconds). On the other hand, as time elapses from the occurrence of vibration (for example, after 0.2 seconds), the influence of the natural vibration of the sample and the like appears more strongly than the vibration passage suppression effect. Therefore, in the following, the vibration passage suppression effect due to the shape of each sample is evaluated by paying particular attention to the portion immediately after the occurrence of vibration in the vibration measurement results.

  As shown in FIG. 9, in the sample V, the amplitude of vibration measured outside the sample is significantly smaller than the amplitude of vibration measured inside the sample. On the other hand, as shown in FIGS. 10 to 13, the sample U, the sample C, the sample reverse S, and the sample S seem to have a small amplitude to a certain extent, but the amplitude is remarkable as in the sample V. It will not be small.

  Here, the degree of amplitude decrease in each sample is quantitatively evaluated using the attenuation. The degree of attenuation is a value obtained by dividing the sum of squares of vibration displacement measured inside the sample for 0.2 seconds from the start of measurement by the sum of squares of vibration displacement measured outside the sample.

  14 and 15 are graphs showing the degree of attenuation in each sample shown in FIG. FIG. 14 is a graph showing the attenuation of a sample having a plate thickness of 0.5 mm, and FIG. 15 is a graph showing the attenuation of a sample having a plate thickness of 1.0 mm. The attenuation shown in the graphs of FIGS. 14 and 15 is obtained by preparing five samples of the same shape for each of the five shapes shown in FIG. This is obtained by averaging 25 attenuation values calculated from the 25 measurement results.

  As shown in FIGS. 14 and 15, the attenuation of the sample V is significantly smaller than the other samples. As shown in FIG. 15, when only the sample with a plate thickness of 1.0 mm is viewed, the attenuation of sample C is as small as that of sample V. However, the attenuation of the sample V is significantly smaller than that of the other samples regardless of whether the plate thickness is 0.5 mm or 1.0 mm.

  Thus, it turns out that the passage of vibration can be effectively suppressed by making the peripheral portion 231 V-shaped.

  By the way, when attention is paid only to the bent portion of the sample reverse S and the sample S, it can be said that the sample V has a V-shape bent at an acute angle like the sample V. However, compared with the sample V, the sample reverse S and the sample S have a small vibration suppression effect.

  Regarding this factor, unlike the sample V, in the sample reverse S and the sample S, it can be mentioned that the central portion protrudes into the space surrounded by the inside and the outside and is folded back. Therefore, in the shape like the sample reverse S or the sample S, even if the passage of vibration is suppressed in the V-shaped portion, the shape is like a spring as a whole. Can be reduced (for example, see the portion after 0.2 seconds in the graph of FIG. 12).

  Therefore, in the case where the peripheral portion 231 is V-shaped, an experiment similar to the above-described experiment (see FIG. 7) was performed in order to verify the shape that can effectively suppress the passage of vibration. The results of this experiment will be described below with reference to the drawings.

  FIG. 16 is a side view showing the shape of each sample. As shown in FIG. 16, there are four types of sample shapes used in this experiment. The sample shown in FIG. 16A is a V-shaped sample (hereinafter referred to as “sample V20”) that protrudes out of the space surrounded by the center and is folded back at 20 °. This is the same sample as shown in (a). The sample shown in FIG. 16B is a V-shaped sample (hereinafter referred to as “sample V70”) whose central portion protrudes outside the space surrounded by the inside and outside and is folded at 70 °. The sample shown in FIG. 16C is a V-shaped sample (hereinafter referred to as “sample V120”) that protrudes out of the space surrounded by the center and inside and is folded back at 120 °. The sample shown in FIG. 16D is an M-shaped sample (hereinafter referred to as “sample M”) that protrudes into the space surrounded by the center and is folded back at 30 °.

  17 and 18 are graphs showing the degree of attenuation in each sample shown in FIG. FIG. 17 is a graph showing the attenuation of a sample having a plate thickness of 0.5 mm, and FIG. 18 is a graph showing the attenuation of a sample having a plate thickness of 1.0 mm. The attenuation shown in the graphs of FIGS. 17 and 18 is calculated by the same method as the attenuation shown in the graphs of FIGS.

  As shown in FIGS. 17 and 18, the attenuation of the sample M is not so small compared to other V-shaped samples. That is, even if the sample is composed only of a shape bent at an acute angle into a V shape, if the shape protrudes into the space surrounded by the inner side and the outer side and is folded back, the effect of suppressing the passage of vibration may be reduced. I understand. In other words, it can be seen that even if the sample is composed of only an acute angle bent in a V shape, the effect of suppressing the passage of vibration is reduced if the sample is bent a plurality of times.

  Further, as shown in FIGS. 17 and 18, when the experimental results of the sample V20, the sample V70, and the sample V120 are compared, a sample with a smaller bending angle (that is, a sample bent sharply) has a vibration passing suppression effect. You can see that it ’s big. In particular, it can be seen that the effect of suppressing the passage of vibration is significantly greater in the sample V20 having a relatively small bending angle compared to the sample V70 and the sample V120 having a relatively large bending angle. Therefore, it can be seen that it is preferable to make the angle of bending smaller than 70 ° from the viewpoint of increasing the vibration suppression effect.

  Therefore, it is possible to effectively suppress the passage of vibration by forming the peripheral edge portion 231 into a V shape that protrudes outside the space surrounded by the inner wall portion 21 and the outer wall portion 22 and is bent only once. Become. In addition, by making the peripheral edge portion 231 into a V shape bent at an angle smaller than 70 °, it is possible to effectively suppress the passage of vibration.

[Fourth embodiment]
19 is a cross-sectional view showing a fourth example of the speaker according to the embodiment of the present invention, and shows a cross-section corresponding to the cross-section shown in FIG. 2 (A-A cross-section, see FIG. 1).

As shown in FIG. 19, in the speaker 1 ^</ b> D of this example, the air pressure in the sealed space between the inner wall portion 21 and the outer wall portion 22 is a negative pressure (a pressure lower than the atmospheric pressure, for example, about 10 ⁻² Pa to 10 Pa). )become. Specifically, the speaker 1E of this example includes an exhaust port 221 that penetrates a part of the outer wall portion 22 (the bottom portion in the example shown in FIG. 19), a sealing material 25 provided so as to close the exhaust port 221, and a sealing member. And a protective plate 26 provided so as to cover the outer surface of the stopper 25.

  The sealing material 25 is a brazing material made of, for example, tin alone, an alloy of tin and silver, an alloy of copper and zinc, or the like, and is made of a material having a melting point lower than that of the material forming at least the casing 20. Further, the protection plate 26 is made of the same material as that of the housing 20, for example.

  When producing the speaker 1D of this example, first, the cabinet between which the housing 20 is placed is evacuated, so that the space between the inner wall portion 21 and the outer wall portion 22 is reduced through the exhaust port 221. Next, the temperature in the cabinet is raised to melt (soften) the sealing material 25, the sealing material 25 is brought into close contact with the exhaust port 221 and sealed, and then the temperature of the cabinet is lowered. Thereby, between the inner wall part 21 and the outer wall part 22 turns into a sealed space, and it maintains with the state of a negative pressure. And the housing | casing 20 is taken out from a cabinet, and the protection board 26 is joined to the outer wall part 22 by welding, brazing, etc. so that the outer surface of the sealing material 25 may be covered.

  Thus, when the sealed space between the inner wall portion 21 and the outer wall portion 22 is set to a negative pressure, it is possible to suppress vibration propagating from the inner wall portion 21 to the outer wall portion 22 through the sealed space. Further, when the sealed space between the inner wall portion 21 and the outer wall portion 22 has a negative pressure, the inner wall portion 21 is pulled toward the outer wall portion 22, whereby stress is applied to the inner wall portion 21. For this reason, it is possible to effectively suppress the sneak propagation vibration.

  Even when the sealed space between the inner wall portion 21 and the outer wall portion 22 is not negative pressure (that is, gas such as air is sealed in the sealed space), the gas in the sealed space acts as a damper. The vibration propagating from the inner wall portion 21 to the outer wall portion 22 through the sealed space can be suppressed to some extent.

[Fifth embodiment]
20 is a cross-sectional view showing a fifth example of the speaker according to the embodiment of the present invention, and shows a cross section corresponding to the cross section shown in FIG. 2 (AA cross section, see FIG. 1).

  As shown in FIG. 20, in the speaker 1 </ b> E of this example, a through hole 27 that penetrates the inner wall portion 21 and the outer wall portion 22 is provided in a part of the casing 20 (in the center of the bottom portion in this example). A bass reflex port 28 is provided. However, even if the through hole 27 and the bass reflex port 28 are provided, the space between the inner wall portion 21 and the outer wall portion 22 is a sealed space, and the housing 20 has a double wall structure.

  As described above, even when the through hole 27 and the bass reflex port 28 are provided in the housing 20, the housing 20 is mounted in the same manner as the speaker 1 having the basic configuration described above and the speakers 1A to 1D of the first to fourth embodiments. It is possible to effectively suppress the propagation of the sound wave through.

  In addition, if the housing | casing 20 is a double wall structure, what kind of deformation | transformation may be added with respect to the housing | casing 20 not only to the above through-holes 27 and the bass-reflex port 28. FIG.

<Manufacturing method>
Next, an example of the manufacturing method of the speaker housing according to the embodiment of the present invention will be described with reference to the drawings. 21 to 23 are perspective views illustrating an example of a method for manufacturing the speaker housing according to the embodiment of the present invention. FIG. 24 is a cross-sectional view of the speaker housing manufactured by the manufacturing method shown in FIGS. 25 to 27 show the steps of manufacturing the casing in the order of FIGS. 21, 22, and 23. FIG. 24 shows a cross section corresponding to the cross section shown in FIG. 2 (cross section AA, see FIG. 1).

  In the manufacturing method of the present example, first, as shown in FIG. 21, an inner wall portion trunk portion 21X and an inner wall portion bottom portion 21Y are produced. The inner wall body 21X can be manufactured, for example, by bending a plate material into a cylindrical shape and then joining the joints by welding or brazing. Further, the thread 211 can be formed by subjecting the inner wall body 21X joined into a cylindrical shape to roll forming. Further, the inner wall bottom 21Y can be produced by, for example, drawing a plate material.

  At this time, the shape of at least one end portion of the inner wall portion trunk portion 21X that is open is made substantially equal to the shape of the end portion of the inner wall portion bottom portion 21Y that is opened. And the inner wall part 21 is produced by joining each end part of the inner wall part trunk | drum 21X and the inner wall part bottom part 21Y which made the shape substantially equal by welding, brazing, etc. FIG.

  Next, as shown in FIG. 22, the outer wall portion body portion 22 </ b> X is produced. For example, the outer wall body portion 22X is formed into a cylindrical shape by bending the plate material in the same manner as the inner wall portion body portion 21X, and then joined by welding or brazing, and further to one end portion. It can be manufactured by performing a mouth drawing process.

  Then, the inner wall portion 21 is inserted into the space inside the outer wall portion barrel portion 22X so that the narrow end portion of the outer wall portion barrel portion 22X and the open end portion of the inner wall portion 21 are aligned. . Then, the end portion of the outer wall body portion 22X having a narrow mouth and the open end portion of the inner wall portion 21 are integrally joined by welding or brazing. Thereby, the peripheral part 23 is formed. In addition, the peripheral part 23 formed with the manufacturing method of this example becomes a shape similar to the peripheral part 231 of 4th Example (refer FIG. 6) mentioned above.

  Next, as shown in FIG. 23, the outer wall bottom 22Y is produced. For example, the outer wall bottom 22Y can be manufactured by subjecting a plate material to drawing and reverse drawing in order. And after inserting the open end of the outer wall bottom 22Y from the end side where the peripheral edge 23 of the outer wall trunk 22X is not formed, the folded portion of the outer periphery of the outer wall bottom 22Y is replaced with the outer wall trunk Join to the inside of 22X by welding or brazing. Thus, the housing 20 as shown in FIG. 24 is manufactured.

  Note that the method of manufacturing the housing 20 illustrated in FIGS. 21 to 23 is merely an example, and the housing 20 can be manufactured by a method different from this method. For example, in the manufacturing method of this example, the case where the thread 211 is formed at the time of manufacturing the inner wall body 21X is illustrated (see FIG. 21), but the thread 211 is formed at any timing and method. May be. Specifically, for example, as shown in FIG. 24, the thread 211 may be formed by cutting the inner wall 21 in a state where the joining of the inner wall 21 and the outer wall 22 is completed.

<Deformation, etc.>
In the description of the speaker 1, 1A to 1E and the housing manufacturing method described above, the inner wall portion 21 and the outer wall portion 22 have a circular bottomed cross section, and the axis of the inner wall portion 21 passes through the opening surface 24. The case 20 is illustrated. However, the shapes of the inner wall portion 21 and the outer wall portion 22 are not limited to this example. For example, the housing 20 in which the axis of the inner wall portion 21 does not pass through the opening surface 24 may be used. Specifically, for example, the inner diameter of the opening surface 24 (peripheral portion 23) is smaller than the inner diameter of the body portion of the inner wall portion 21, and the opening surface 24 (peripheral portion 23) is the axial center of the inner wall portion 21. It may be a bottomed cylindrical casing 20 that is in an eccentric position deviating from the above. Furthermore, the shape of the inner wall portion 21 and the outer wall portion 22 is not limited to a bottomed cylindrical shape having a circular cross section, and may be any shape. Specifically, for example, the cross section may be a bottomed cylindrical shape such as an ellipse or a polygon, or the bottom of a shell type or the like may not be a flat surface.

  Further, in the above-described speakers 1, 1 </ b> A to 1 </ b> E, in order to suppress direct propagation vibration, the outer surface of the unit support 13 is not in contact with the peripheral portion 23 (the outer diameter in the vicinity of the peripheral portion 23 is partially The shape is smaller). However, the shape of the outer surface of the unit support 13 is not limited to this example, and may be a shape that contacts the peripheral edge 23.

  Further, in the above-described speakers 1 and 1A to 1E, it has been described that the peripheral portions 23 and 231 are formed by joining and integrating the inner wall portion 21 and the outer wall portion 22 by welding or brazing. Any joining method may be used. Specifically, for example, the end portions of the inner wall portion 21 and the outer wall portion 22 face each other or bend in the same direction and are overlapped, and the overlapped portions are joined by welding, brazing, or the like, so that the peripheral portions 23 and 231 are joined. May be formed. Also, for example, one end of the inner wall portion 21 and the outer wall portion 22 is bent, brought into contact with the other end portion or the side surface, and the contacted portion is joined by welding, brazing, or the like, whereby the peripheral portion 23 , 231 may be formed. Also, for example, one or both of the inner wall portion 21 and the outer wall portion 22 are bent into a crank shape and the end portions are overlapped, and the overlapped portions are joined by welding or brazing to form the peripheral portions 23 and 231. Also good. Further, for example, the peripheral edge portions 23 and 231 may be formed by disposing a bridging material at the spaced apart end portions of the inner wall portion 21 and the outer wall portion 22 and joining them by welding or brazing.

  Furthermore, it is also possible to form the peripheral portions 23 and 231 without joining the inner wall portion 21 and the outer wall portion 22. For example, the peripheral portions 23 and 231 may be formed without requiring joining by performing drawing or bending on a single plate material that is originally integral. In this case, you may join places other than the peripheral parts 23 and 231 by welding, brazing, etc. as needed.

  Moreover, although the speaker 1, 1A-1E mentioned above is the structure where the speaker unit 10 contacts only the inner wall part 21 and does not contact the outer wall part 22, the present invention does not contact the outer wall part 22. This does not completely exclude the structure that touches the surface. For example, when the speaker unit 10 is supported by being in contact with the inner wall portion 21, a part of the speaker unit 10 may be in contact with the outer wall portion 22. Even in such a structure, as long as the speaker unit 10 is mainly supported by being in contact with the inner wall portion 21, the contact between the speaker unit 10 and the outer wall portion 22 can be minimized. Propagation vibration can be sufficiently suppressed.

  If necessary, for example, an elastic body or the like for suppressing vibration may be provided between the speaker unit 10 and the housing 20. However, since the speaker 1 according to the embodiment of the present invention has a structure capable of suppressing the propagation of sound waves through the housing, only a few elastic bodies need be provided. For example, as described above, in the case of a speaker that allows contact between the speaker unit 10 and the outer wall portion 22, an elastic body may be provided between the speaker unit 10 and the outer wall portion 22. In this case, direct propagation vibration can be further suppressed.

  Moreover, the structure provided with the baffle board may be sufficient as the speaker unit 10. FIG. For example, the speaker unit 10 may have a configuration in which a baffle plate is provided around the front end and the diaphragm 11. In this case, the baffle plate forms part of the speaker unit 10. In this case, the baffle plate may be integrated with the unit support portion 13 so as to be in contact with and supported by the inner wall portion 21.

  The present invention can be suitably used for a speaker having a double wall structure and a speaker housing applied to the speaker.

1, 1A to 1E: Speaker 10: Speaker unit 11: Diaphragm 111: Center cap 12: Drive unit 13: Unit support 131, 132: Screw thread (speaker unit side)
1311, 1321: Frank 14: Edge part 20: Case 21: Inner wall part 211, 212: Screw thread (inner wall part side)
2111, 2121: Frank 213: Neck part (step part)
21X: Inner wall portion barrel portion 21Y: Inner wall portion bottom portion 22: Outer wall portion 221: Exhaust hole 22X: Outer wall portion barrel portion 22Y: Outer wall portion bottom portion 23, 231: Peripheral portion 24: Opening surface 25: Sealing material 26: Protection plate 27 : Through hole 28: Bass reflex port

Claims (14)

A speaker having a speaker unit and a housing,
The housing includes an inner wall portion that is partially open and has a space inside, and an outer wall portion that is partially open and in which the inner wall portion is disposed in the space, and the inner wall portion Each of the open end portions of the outer wall portion is integrated to form a peripheral portion, and a double wall structure in which a space between the inner wall portion and the outer wall portion is a sealed space,
At least a part of the speaker unit is supported by being screwed into the inner wall portion at a position spaced from the peripheral edge portion in a direction toward the inner space of the inner wall portion ,
The inner wall portion and the outer wall portion as the shape of the peripheral portion in a cross section perpendicular to the opening surface having the outer periphery as the outer periphery is directed in the direction opposite to the direction toward the inner space of the inner wall portion. Including a V-shape that is asymptotic .   An outer diameter of a screw thread provided in the speaker unit and screwed into the inner wall portion gradually increases from a space inside the inner wall portion toward an opening surface having the peripheral edge as an outer periphery. The speaker according to claim 1. Of the peripheral edge, the shape of the cross section perpendicular to the opening surface, characterized in that the a inner wall portion and V-shaped folded back protrudes into the space outside surrounded by the outer wall according to claim 1 or 2. The speaker according to 2 . The speaker according to any one of claims 1 to 3 , wherein a shape of the peripheral portion in a cross section perpendicular to the opening surface is a V-shape bent only once. Of the peripheral edge, the shape of the cross section perpendicular to the opening surface, according to any one of claims 1 to 4, characterized in that a V-shaped bent at an angle smaller than 70 ° Speaker. The speaker unit includes a diaphragm, a drive unit that drives and vibrates the diaphragm according to an input electric signal, and a unit support unit that supports at least the drive unit,
It said unit support portion, the speaker according to any one of claims 1 to 5, characterized in that the support is screwed to the inner wall portion. When the direction toward the inner space of the inner wall portion from the opening surface having the peripheral edge as the outer periphery is the rear, and the opposite direction of the rear is the front,
At least a portion of the unit support portion, at a position at which the rear than the end of the front of the diaphragm, according to claim 6, characterized in that it is supported screwed into the inner wall portion Speaker. When the direction toward the inner space of the inner wall portion from the opening surface having the peripheral edge as the outer periphery is the rear, and the opposite direction of the rear is the front,
The front end portion, a speaker according to any one of claims 1 to 7, than the peripheral portion, characterized in that located in the front of the speaker unit. The speaker according to claim 8 , wherein an outer edge of the speaker unit extends to the front of the peripheral edge and is separated from the peripheral edge. The speaker according to any one of claims 1 to 9 , wherein the inner wall portion has a bottomed cylindrical shape, and an axis of the inner wall portion passes through an opening surface having the outer periphery as the outer peripheral portion. . The inner wall portion is provided with a stepped portion projecting into the inner space,
The speaker unit is supported by being screwed into the inner wall portion in a state where an end portion of the speaker unit inserted into a space inside the inner wall portion is in contact with the stepped portion. The speaker according to any one of claims 1 to 10 . Each of a screw thread provided on the speaker unit and screwed into the inner wall part, and a screw thread provided on the inner wall part and screwed into the speaker unit are in a direction perpendicular to the screwing direction. Have inclined flank,
End of the speaker unit inserted into the inner space of the inner wall portion is in contact with the said stepped portion, to claim 11, wherein the speaker unit is supported by the inner wall portion The speaker described. The speaker according to any one of claims 1 to 12 , wherein an air pressure in the sealed space between the inner wall portion and the outer wall portion is lower than an atmospheric pressure. An inner wall part of which is open and has a space inside;
An outer wall part in which the inner wall part is disposed in a space that is partially open and has an inner side,
Each of the opened end portions of the inner wall portion and the outer wall portion is integrated to form a peripheral edge portion, and a double wall structure in which a space between the inner wall portion and the outer wall portion becomes a sealed space,
A support structure for screwing and supporting at least a part of the speaker unit by being screwed to the inner wall at a position spaced from the peripheral edge to the side opposite to the end is provided on the inner wall .
The shape of the peripheral portion in a cross section perpendicular to the opening surface having the peripheral portion as the outer periphery includes a V-shape in which the inner wall portion and the outer wall portion are gradually approached toward the end portion side. Characteristic speaker housing.

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