Insulator

Abstract

To suppress influence on an application object by vibration of the application object.SOLUTION: The insulator 1 includes an upper case 10, a lower case 20, a first elastic member 30, and a guide member 40. The upper case 10 and the lower case 20 face each other via the first elastic member 30, and are relatively movable in the facing direction. The guide member 40 guides the relative movement of the upper case 10 and the lower case 20 in the facing direction. The guide member 40 is fixed to one of the upper case 10 and the lower case 20, and supports the other of the upper case 10 and the lower case 20 so as to be slidable in a direction in which the upper case 10 and the lower case 20 face each other.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an insulator, and more particularly to an insulator for vibration isolation. [Background technology]

[0002] Conventionally, insulators have been used to insulate vibrations. Specifically, insulators are provided in vibration propagation paths to insulate the vibrations and prevent or suppress the propagation of the vibrations. For example, an insulator is placed between a speaker and a mounting stand on which the speaker is mounted, to prevent or suppress the propagation of vibrations from the speaker to the mounting stand, or from the mounting stand to the speaker. This suppresses the effect of speaker vibrations on the speaker's sound, or the effect of mounting stand vibrations on the speaker's sound (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-488088 Summary of the Invention [Problem to be solved by the invention]

[0004] However, conventional insulators only act on vibrations in the opposing direction, i.e., the direction in which the insulator's target and its mounting base face each other, and are not designed to act on vibrations in a direction intersecting the opposing direction. For example, a speaker generates sound by vibrating its diaphragm, but the reaction to this diaphragm vibration exerts a force on the speaker body in the opposite direction to the diaphragm's vibration. In conventional insulators, the reaction to the diaphragm vibration causes the speaker body to move, and the speaker body is excited by the diaphragm's vibration. This reduces the amplitude of the diaphragm in a fixed coordinate system, affecting the speaker's acoustics.

[0005] Thus, conventional insulators have room for improvement in order to prevent the insulator from affecting the object to which it is applied due to vibrations of the object to which it is applied.

[0006] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an insulator that can suppress the influence of vibrations of the object to which the insulator is applied. [Means for solving the problem]

[0007] In order to achieve the above object, the insulator of the present invention comprises an upper member, a lower member, a first elastic member which is an elastic member, and a guide member, wherein the upper member and the lower member face each other via the first elastic member and are capable of relative movement in the opposing direction, and the guide member is configured to guide the relative movement between the upper member and the lower member in the opposing direction, and the guide member is fixed to one of the upper member and the lower member and is configured to support the other of the upper member and the lower member so that it can slide in the opposing direction.

[0008] An insulator according to one aspect of the present invention further includes a dynamic vibration absorbing portion, which is capable of vibrating relative to the upper member or the lower member in a direction intersecting the opposing direction.

[0009] In an insulator according to one aspect of the present invention, the dynamic vibration absorbing portion is annular in the opposing direction and surrounds the upper member or the lower member from the outer periphery.

[0010] In an insulator according to one aspect of the present invention, the dynamic vibration absorber includes a second elastic member that is an annular elastic member, and a mass member that is a mass body that surrounds the second elastic member from the outer periphery side.

[0011] An insulator according to one embodiment of the present invention is arranged between an application object and an installation portion on which the application object is installed, and the elastic properties of the second elastic member in the intersecting direction and the inertial mass of the mass member are set based on the natural frequency of vibration of the application object in the intersecting direction.

[0012] In an insulator according to one embodiment of the present invention, the dynamic vibration absorbing portion is capable of vibrating in the opposing direction, and the elastic properties of the second elastic member and the inertial mass of the mass member in the opposing direction are set based on the natural frequency of the first elastic member.

[0013] In the insulator according to one aspect of the present invention, the first elastic member is a spring member.

[0014] In the insulator according to one aspect of the present invention, the second elastic member is a rubber member.

[0015] In the insulator according to one aspect of the present invention, the guide member is a cylindrical member extending in the opposing direction. [Effects of the Invention]

[0016] According to the insulator of the present invention, it is possible to suppress the influence of vibrations of the object to which the insulator is applied. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a cross-sectional view showing a schematic configuration of an insulator according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view showing an example of a state in which the insulator is used in an application. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that in the drawings, not all of the components are designated by reference numerals, and some of the reference numerals of the components may be omitted. An insulator according to the present invention is an insulator for isolating vibrations and aims to insulate vibrations along a vibration propagation path. The insulator according to the present invention is, for example, provided between an application object to which the insulator is applied and an installation section on which the application object is installed, and aims to prevent or suppress vibration propagation from the application object to the installation section, and also aims to prevent or suppress vibration propagation from the installation section to the application object. An application object of the insulator according to the present invention is, for example, a speaker, and the installation section is, for example, an installation stand on which the speaker is placed. Note that the application object of the insulator according to the present invention is not limited to a speaker. The application object of the insulator according to the present invention may be various, for example, anything on which the insulator according to the present invention can be used.

[0019] FIG. 1 is a cross-sectional view showing a schematic configuration of an insulator 1 according to an embodiment of the present invention. As an example, the insulator 1 is intended for use with a speaker and is provided on a speaker and a mounting base on which the speaker is placed. Specifically, the insulator 1 is provided on the mounting base and supports the speaker on the mounting base. FIG. 1 shows the insulator 1 in an in-use state supporting the speaker on the mounting base. FIG. 1 also shows the insulator 1 in a stable state where no force other than the weight of the speaker is acting on it. Note that the speaker and mounting base are not shown in FIG. 1.

[0020] As shown in FIG. 1, the insulator 1 includes an upper case 10 as an upper member, a lower case 20 as a lower member, a first elastic member 30 as an elastic member, and a guide member 40. The upper case 10 and the lower case 20 face each other via the first elastic member 30 and are relatively movable in the opposing direction. The guide member 40 guides the relative movement of the upper case 10 and the lower case 20 in the opposing direction. The guide member 40 is fixed to one of the upper case 10 and the lower case 20 and supports the other of the upper case 10 and the lower case 20 so that it can slide in the opposing direction. The configuration of the insulator 1 will be described in detail below.

[0021] As shown in FIGS. 1 and 2 , the upper case 10 and the lower case 20 face each other in the direction of the axis x via the first elastic member 30. The axis x is, for example, a virtual line extending vertically when the insulator 1 is in use. The upper case 10 is, for example, an upper case, and is positioned on the upper side (speaker side) and in contact with the speaker when in use. The lower case 20 is, for example, a lower case, and is positioned on the lower side (installation stand side) and in contact with the installation stand when in use. Furthermore, when in use, the upper case 10 contacts the upper end of the first elastic member 30, and the lower case 20 contacts the lower end of the first elastic member 30. The upper case 10 and the lower case 20 face each other in the vertical direction, sandwiching the first elastic member 30 therebetween.

[0022] For ease of explanation, the side facing the speaker in the direction of the axis x will be referred to as the upper side, and the side facing the installation base in the direction of the axis x will be referred to as the lower side. Also, the direction perpendicular to the direction of the axis x will be referred to as the radial direction, with the outer side in the radial direction being referred to as the outer circumferential side, and the inner side in the radial direction being referred to as the inner circumferential side.

[0023] As shown in FIG. 1, for example, the upper case 10 is capable of accommodating the lower case 20 therein, and specifically, for example, has a bottomed cylindrical shape with a bottom on the upper side. For example, the upper case 10 has a cylindrical portion 11 that extends along the axis x, and an upper bottom portion 12 that closes the upper opening of the cylindrical portion 11. The upper bottom portion 12 forms the upper end of the space defined by the upper case 10. As shown in FIG. 1, for example, the cylindrical portion 11 has a substantially cylindrical shape with the axis x as its central axis or approximately central axis. As shown in FIG. 1, for example, the upper bottom portion 12 has a disk-like or approximately disk-like shape, and the outer peripheral end of the upper bottom portion 12 is connected to the upper end of the cylindrical portion 11.

[0024] As shown in FIG. 1, the upper bottom portion 12 has a support surface 13 and an upper bottom surface 14, which are a pair of surfaces facing back to back in the direction of the axis x. The support surface 13 faces upward and is the surface that comes into contact with the speaker from below when the insulator 1 is in use. The support surface 13 extends, for example, along a plane perpendicular to the axis x. As shown in FIG. 1, the upper bottom surface 14 has a support surface 14a, which is an annular surface around the axis x, and a convex portion 14b that protrudes downward is formed on the inner peripheral side of the support surface 14a. The support surface 14a extends, for example, along a plane perpendicular to the axis x. The support surface 14a is, for example, parallel or approximately parallel to the upper support surface 13. The convex portion 14b has, for example, a cylindrical or approximately cylindrical shape with the axis x as its central axis or approximately its central axis. The shape of the upper bottom portion 12 is not limited to the above-mentioned shape.

[0025] As shown in FIG. 1, the cylindrical portion 11 has an inner peripheral surface 15 and an outer peripheral surface 16, which are cylindrical surfaces facing each other in the radial direction. The inner peripheral surface 15 is a surface facing the inner peripheral side, and is, for example, a cylindrical surface or an approximately cylindrical surface with the axis x as its central axis or approximately central axis. Furthermore, as shown in FIG. 1, the outer peripheral surface 16 forms a convex portion 16a, which is an annular portion protruding outward. As shown in FIG. 1, the convex portion 16a has an outer peripheral surface 16b, which is an annular surface facing the outer peripheral side. The outer peripheral surface 16b forms a step portion protruding outward on the outer peripheral surface 16. The outer peripheral surface 16b is, for example, a cylindrical surface or an approximately cylindrical surface with the axis x as its central axis or approximately central axis. Furthermore, the convex portion 16a is formed at the lower end of the cylindrical portion 11 and in the vicinity thereof, as shown in FIG. 1, for example. The protrusion 16a may be formed between the lower end and the upper end of the cylindrical portion 11, or may be formed at or near the upper end of the cylindrical portion 11. The shape of the cylindrical portion 11 is not limited to the above-mentioned shape.

[0026] The upper case 10 has the above-described configuration and is integrally formed from the same material. The material of the upper case 10 is not limited to a specific material and may be, for example, metal or resin. It is preferable that the upper case 10 is lightweight, and the material of the upper case 10 is, for example, aluminum or an aluminum alloy.

[0027] As shown in FIG. 1, for example, the lower case 20 can be housed inside the tubular portion 11 of the upper case 10. Specifically, for example, the lower case 20 has a bottomed tubular shape with a bottom on the lower side. For example, the lower case 20 has a tubular portion 21 that is a tubular portion extending along the axis x and a lower bottom portion 22 that closes the lower opening of the tubular portion 21. The lower bottom portion 22 forms the lower end of the space defined by the lower case 20. As shown in FIG. 1, for example, the tubular portion 21 has a cylindrical or approximately cylindrical shape with the axis x as its central axis or approximately central axis. As shown in FIG. 1, for example, the lower bottom portion 22 has a disk-like or approximately disk-like shape, and is connected to the lower end of the tubular portion 21 so that the outer peripheral end of the lower bottom portion 22 protrudes outward from the tubular portion 21.

[0028] As shown in FIG. 1, the lower bottom portion 22 has a pair of surfaces, namely, an installation surface 23 and a lower bottom surface 24, facing back to back in the direction of the axis x. The installation surface 23 faces downward and is the surface that comes into contact with an installation base from above when the insulator 1 is in use. The installation surface 23 extends, for example, along a plane perpendicular to the axis x. The lower bottom surface 24 closes the lower opening of the tubular portion 21. As shown in FIG. 1, for example, the lower bottom surface 24 has a support surface 24a that is an annular surface around the axis x. A convex portion 24b that protrudes upward is formed on the inner circumferential side of the support surface 24a. The support surface 24a extends, for example, along a plane perpendicular to the axis x. The support surface 24a is parallel or approximately parallel to the lower installation surface 23, for example. The convex portion 24b has, for example, a cylindrical or approximately cylindrical shape with the axis x as its central axis or approximately its central axis.

[0029] As described above, the lower bottom portion 22 protrudes more radially outward than the tubular portion 21, and the installation surface 23 protrudes more radially outward than the tubular portion 21. Furthermore, the lower bottom portion 22 has, in the portion that protrudes more radially outward than the tubular portion 21, a flange surface 25 that is an annular surface that faces upwardly away from the installation surface 23. Note that the shape of the lower bottom portion 21 is not limited to the shape described above.

[0030] As shown in FIG. 1 , the tubular portion 21 has an inner circumferential surface 26 and an outer circumferential surface 27, which are cylindrical surfaces facing each other in the radial direction. The inner circumferential surface 26 faces the inner circumferential side and is, for example, a cylindrical surface or an approximately cylindrical surface with the axis x as its central axis or approximate central axis. The outer circumferential surface 27 is, for example, a cylindrical surface or an approximately cylindrical surface with the axis x as its central axis or approximate central axis. The tubular portion 21 is insertable into the space inside the tubular portion 11 of the upper case 10 in the direction of the axis x. When the tubular portion 21 is inserted into the space inside the tubular portion 11 of the upper case 10, an annular gap is formed between the outer circumferential surface 27 of the tubular portion 21 and the inner circumferential surface 15 of the tubular portion 11. In other words, the diameter of the outer circumferential surface 27 of the tubular portion 21 is smaller than the diameter of the inner circumferential surface 15 of the tubular portion 11. As described above, the cylindrical portion 21 has a cylindrical surface or a substantially cylindrical surface with the axis x as its central axis or a substantially central axis, and the cylindrical portion 11 has a cylindrical surface or a substantially cylindrical surface with the axis x as its central axis or a substantially central axis, and therefore a cylindrical or substantially cylindrical gap with a uniform or substantially uniform radial width is formed between the cylindrical portions 21 and 11. Note that the shape of the cylindrical portion 21 is not limited to the above-described shape.

[0031] The lower case 20 has the above-described configuration and is integrally formed from the same material. The material of the lower case 20 is not limited to a specific material and may be, for example, metal or resin. It is preferable that the lower case 20 is lightweight, and the material of the lower case 20 is, for example, aluminum or an aluminum alloy.

[0032] The first elastic member 30 is sandwiched between the upper bottom portion 12 of the upper case 10 and the lower bottom portion 22 of the lower case 20 and elastically deforms in the direction of the axis x, such as a spring member. As shown in FIG. 1 , the first elastic member 30 is, for example, a coil spring. As shown in FIG. 1 , an upper end 31 of the coil spring 30 is configured to contact the support surface 14a of the upper bottom surface 14 of the upper bottom portion 12 and engage with the protrusion 14b. Also, as shown in FIG. 1 , a lower end 32 of the coil spring 30 is configured to contact the support surface 24a of the lower bottom surface 24 of the lower bottom portion 22 and engage with the protrusion 24b. As shown in FIG. 1 , when the insulator 1 is in use, the upper end 31 of the coil spring 30 is in contact with the support surface 14a of the upper bottom surface 14 and engages with the protrusion 14b. 1, when insulator 1 is in use, lower end 32 of coil spring 30 is in contact with support surface 24a of lower bottom surface 24 and is engaged with protrusion 24b. Also, as shown in Fig. 1, when insulator 1 is in a stable state, coil spring 30 is compressed in the direction of axis x by receiving a load due to the weight of the speaker via upper case 10, and the elastic force generated in coil spring 30 and the weight of the speaker are balanced, resulting in a stable state in which it does not expand or contract.

[0033] As will be described later, when the insulator 1 is in use, the coil spring 30 forms a spring-mass resonance system that resonates at a specific frequency using the speaker as a mass, thereby preventing or suppressing the propagation of vibrations from the speaker to the installation base. Specifically, the coil spring 30 expands in response to vibrations of the speaker in the direction of the axis x, absorbing the vibrations in the direction of the axis x due to the vibrations of the speaker and preventing or suppressing the propagation of the vibrations to the installation base. In this way, the elastic characteristics of the coil spring 30 are set so that the coil spring 30 prevents or suppresses the propagation of vibrations from the speaker. The elastic characteristics of the coil spring 30 are, for example, the spring constant of the coil spring 30. The spring constant of the coil spring 30 is set low, for example. By setting the resonant frequency of the spring-mass resonance system formed by the speaker and the coil spring 30 lower than the lowest frequency that the speaker can reproduce, the speaker's reproducible frequency band can be made into a vibration-damping range in which the spring-mass resonance system acts.

[0034] As described above, the insulator 1 also includes a guide member 40 that guides the relative movement of the upper case 10 and the lower case 20 in the direction of the axis x. The guide member 40 is fixed to one of the upper case 10 and the lower case 20, and supports the other of the upper case 10 and the lower case 20 so that the other can slide in the direction of the axis x. In the insulator 1, as an example, the guide member 40 is fixed to the upper case 10, and supports the lower case 20 so that the other can slide. As shown in FIG. 1, the guide member 10 is, for example, a cylindrical member extending in the direction of the axis x.

[0035] As shown in FIG. 1 , the guide member 40 has a sliding surface 41 and a fixed surface 42, which are cylindrical surfaces facing each other in the radial direction. The sliding surface 41 is a surface facing the inner periphery and is, for example, a cylindrical surface or a substantially cylindrical surface with the axis x as its central axis or a substantially central axis. The fixed surface 42 is a surface facing the outer periphery and is, for example, a cylindrical surface or a substantially cylindrical surface with the axis x as its central axis or a substantially central axis. The sliding surface 41 is formed so as to contact the outer circumferential surface 27 of the tubular portion 21 of the lower case 20 so that the tubular portion 21 can slide in the direction of the axis x. For example, the diameter of the sliding surface 41 of the guide member 40 is slightly smaller than the diameter of the outer circumferential surface 27 of the tubular portion 21 of the lower case 20. The sliding surface 41 does not have to be in contact with the outer circumferential surface 27 of the tubular portion 21 of the lower case 20 entirely, but may be in contact with only a portion of the outer circumferential surface 27.

[0036] Furthermore, the fixing surface 42 is formed to be fixed within the tubular portion 11 of the upper case 10. For example, the guide member 40 is formed to be press-fitted into the tubular portion 11 of the upper case 10. Specifically, the diameter of the fixing surface 42 of the guide member 40 is larger than the diameter of the inner circumferential surface 15 of the tubular portion 11 of the upper case 10. The guide member 40 may be fixed within the tubular portion 11 of the upper case 10 with an adhesive or the like, and in the insulator 1, the guide member 40 may be fixed within the tubular portion 11 of the upper case 10 with an adhesive or the like. In this case, the diameter of the fixing surface 42 of the guide member 40 is smaller than the diameter of the inner circumferential surface 15 of the tubular portion 11 of the upper case 10. Note that, as long as the guide member 40 can be fixed within the tubular portion 11 of the upper case 10, the diameter of the fixing surface 42 of the guide member 40 may be the same as the diameter of the inner circumferential surface 15 of the tubular portion 11 of the upper case 10.

[0037] The guide member 40 is made of, for example, a low-friction polymer material. Examples of low-friction polymer materials that can be used to make the guide member 40 include polytetrafluoroethylene (PTFE), aromatic polyether ketone (PEEK), and polyacetal (POM). However, the material of the guide member 40 is not limited to these.

[0038] As shown in FIG. 1 , the insulator 1 further includes a dynamic vibration absorbing section 50. The dynamic vibration absorbing section 50 is capable of vibrating relative to the upper case 10 or the lower case 20 in a direction intersecting the axis x. The dynamic vibration absorbing section 50 forms a dynamic vibration absorber (dynamic damper) in the insulator 1, and suppresses vibrations in a direction intersecting the axis x of the object to which it is applied. In the insulator 1, as an example, the dynamic vibration absorbing section 40 is provided in the upper case 10, and is capable of vibrating relative to the upper case 10 in a radial direction.

[0039] 1, the dynamic vibration absorber 50 is, for example, annular about the axis x and surrounds the upper case 10 from the outer periphery. The dynamic vibration absorber 50 also has a second elastic member 51 which is an annular elastic member, and a mass member 52 which is a mass body surrounding the second elastic member 51 from the outer periphery. The elastic member which forms the second elastic member 51 is specifically rubber, and the second elastic member 51 is a rubber elastic body.

[0040] As shown in FIG. 1 , the mass member 52 has an inner peripheral surface 53 and an outer peripheral surface 54, which are cylindrical surfaces facing each other in the radial direction. The inner peripheral surface 53 faces the inner periphery and is, for example, a cylindrical surface or an approximately cylindrical surface with the axis x as its central axis or approximate central axis. The outer peripheral surface 54 faces the outer periphery and is, for example, a cylindrical surface or an approximately cylindrical surface with the axis x as its central axis or approximate central axis. The mass member 52 faces the protrusion 16a formed on the outer peripheral surface 16 of the tubular portion 11 of the upper case 10 from the outside in the radial direction, forming an annular gap between the mass member 52 and the protrusion 16a. Specifically, the inner peripheral surface 53 of the mass member 52 faces the outer peripheral surface 16b of the protrusion 16a via an annular gap around the axis x. In other words, the diameter of the inner peripheral surface 53 of the mass member 52 is larger than the diameter of the outer peripheral surface 16b of the protrusion 16a. The width of the mass member 52 in the direction of the axis x is, for example, the same as or approximately the same as the width of the protrusion 16a in the direction of the axis x. Note that the width of the mass member 52 in the direction of the axis x does not have to be the same as the width of the protrusion 16a in the direction of the axis x, and may be larger or smaller than the width of the protrusion 16a in the direction of the axis x.

[0041] The rubber elastic body 51 is attached between the outer peripheral surface 16b of the protrusion 16a and the inner peripheral surface 43 of the mass member 52. Specifically, the rubber elastic body 51 is press-fitted into the annular gap between the outer peripheral surface 16b of the protrusion 16a and the inner peripheral surface 43 of the mass member 52. In this way, the mass member 42 is attached to the tubular portion 11 of the upper case 10 via the rubber elastic body 51. The width of the rubber elastic body 51 in the axial x direction is, for example, the same as or approximately the same as the width of the protrusion 16a in the axial x direction. Note that the width of the rubber elastic body 51 in the axial x direction does not have to be the same as the width of the protrusion 16a in the axial x direction, and may be larger or smaller than the width of the protrusion 16a in the axial x direction.

[0042] As described above, the dynamic vibration absorber 50 forms a dynamic vibration absorber in the insulator 1. When radial vibration of the target is transmitted to the upper case 10, the rubber elastic body 51 elastically deforms and the mass member 52 vibrates in the radial direction. This suppresses the radial vibration of the target. For example, the dynamic vibration absorber 50 suppresses the resonance of the radial vibration of the target. In this case, the elastic properties of the rubber elastic body 51 and the inertial mass of the mass member 52 are set based on the natural frequency of the radial vibration of the target. In the insulator 1, as described below, the dynamic vibration absorber 50 acts to suppress the radial vibration of the speaker. For this reason, the elastic properties of the rubber elastic body 51 and the inertial mass of the mass member 52 are set based on the natural frequency of the radial vibration of the speaker. More specifically, as described below, when the insulator 1 is in use, the speaker and the guide member 40 form a spring-mass resonance system that vibrates in the radial direction. For this reason, the elastic properties of the rubber elastic body 51 and the inertial mass of the mass member 52 are set based on the natural frequency of the spring-mass resonance system formed by the speaker and guide member 40. The elastic properties of the rubber elastic body 51 are, for example, the radial spring constant of the rubber elastic body 51. Specifically, for example, the inertial mass of the mass member 42 and the radial spring constant of the rubber elastic body 41 are adjusted so that the natural frequency of the spring-mass resonance system formed by the speaker and guide member 40 matches or nearly matches the radial natural frequency of the dynamic vibration absorber 50.

[0043] Furthermore, the mass member 52 can also vibrate in the direction of the axis x in response to elastic deformation of the rubber elastic body 51 in the direction of the axis x. Therefore, the dynamic vibration absorber 50 may be configured to suppress surging of the coil spring 30, for example. In this case, the elastic characteristics of the rubber elastic body 51 and the inertial mass of the mass member 52 are set based on the natural frequency of the coil spring 30. The elastic characteristics of the rubber elastic body 41 are, for example, the spring constant of the rubber elastic body 41 in the direction of the axis x. Specifically, for example, the inertial mass of the mass member 52 and the spring constant of the rubber elastic body 51 in the direction of the axis x are adjusted so that the natural frequency of the coil spring 30 and the natural frequency of the dynamic vibration absorber 40 in the direction of the axis x match or approximately match.

[0044] Next, the function of the insulator 1 will be described. FIG. 2 is a cross-sectional view showing an example of the insulator 1 in use in an application. As described above, as an example, the insulator 1 is provided between the speaker 100 and the installation stand 110 on which the speaker 100 is installed, as shown in FIG. 2. A plurality of insulators 1 may be arranged between the speaker 100 and the installation stand 110. As shown in FIG. 2, the insulator 1 is placed on the upper surface 111 of the installation stand 110. When the insulator 1 is in use, the installation surface 23 of the lower bottom 22 of the lower case 20 contacts the upper surface 111 of the installation stand 110, and the support surface 13 of the upper bottom 12 of the upper case 10 contacts the bottom surface 101 of the speaker 100, so that the speaker 100 is supported by the insulator 1 on the installation stand 110.

[0045] The speaker 100 vibrates as the diaphragm of the speaker 100 vibrates. This vibration includes vibration in the direction of the axis x, i.e., the vertical direction. The vertical vibration of the speaker 100 is absorbed by the expansion of the coil spring 30 of the insulator 1, and propagation of the vertical vibration of the speaker 100 to the installation base 110 is prevented or suppressed.

[0046] Furthermore, as the coil spring 30 expands, the upper case 10 and the lower case 20 move relative to each other in the vertical direction, causing the guide member 40 to slide against the tubular portion 21 of the lower case 20. This sliding causes a frictional force to be generated between the sliding surface 41 of the guide member 40 and the outer peripheral surface 27 of the tubular portion 21. Similar to the coil spring 30, this frictional force is a force that resists the vertical vibration of the speaker 100, and the sliding between the guide member 40 and the tubular portion 21 also absorbs the vertical vibration of the speaker 100, preventing or suppressing the propagation of the vertical vibration of the speaker 100 to the installation base 110.

[0047] In this way, the insulator 1 can achieve vibration insulation through the sliding of the guide member 40 in addition to the vibration insulation effect of the coil spring 30, which is the same as in conventional insulators. Therefore, the insulator 1 has high insulation performance against the propagation of vibration in the direction of the axis x. This prevents or suppresses vibration of the mounting base 110, prevents or suppresses sound generation due to vibration of the mounting base 110, and prevents or suppresses any effect on the acoustics of the speaker 100. In this way, the insulator 1 can improve the acoustics of the speaker 100 compared to conventional insulators.

[0048] Furthermore, a force acts on the speaker body 102, including the case of the speaker 100, in a direction opposite to the direction of vibration of the diaphragm due to a reaction to the vibration of the diaphragm. This force acting on the speaker body 102 acts on the upper case 10 of the insulator 1. Here, a guide member 40 is fixed to the cylindrical portion 11 of the upper case 10, and a sliding surface 41 of the guide member 40 contacts the outer peripheral surface 27 of the cylindrical portion 21 of the lower case 20. In this manner, the upper case 10 is supported by the lower case 20 without any gaps in the radial direction, i.e., the horizontal direction, and the rigidity of the insulator 1 in the horizontal direction is high. Therefore, even if a force acting on the speaker body 102 due to the vibration of the diaphragm acts on the upper case 10 of the insulator 1, the upper case 10 can firmly support the speaker body 102, thereby preventing or suppressing horizontal vibration of the speaker body 102. In this way, the insulator 1 can prevent or suppress excitation of the speaker body 102 due to the reaction force of the diaphragm.

[0049] Furthermore, because the guide member 40 is also elastic, the speaker body 102 and the guide member 40 can form a radial spring-mass resonance system with the guide member 40 as a radial spring and the speaker body 102 as a mass. Depending on the magnitude of the force transmitted from the speaker body 102 to the upper case 10, the guide member 40 expands and contracts in the radial direction, acting as a radial spring, and the speaker body 102 and the guide member 40 form the above-mentioned radial spring-mass resonance system. The reproducible frequency range of a typical speaker is approximately 100 Hz to 20 kHz, and the natural frequency of the spring-mass resonance system formed by the speaker body 102 and the guide member 40 falls within the above-mentioned reproducible frequency range of a typical speaker, thereby affecting the acoustics of the speaker 100.

[0050] In response to this, as described above, the insulator 1 has the dynamic vibration absorber 50, which is capable of absorbing radial vibrations. The elastic properties of the rubber elastic body 51 of the dynamic vibration absorber 50 and the inertial mass of the mass member 52 are set based on the natural frequency of the spring-mass resonance system formed by the speaker body 102 and the guide member 40. As a result, the dynamic vibration absorber 50 can absorb the vibrations of the spring-mass resonance system formed by the speaker body 102 and the guide member 40, and can prevent or suppress the vibrations of the spring-mass resonance system formed by the speaker body 102 and the guide member 40. This makes it possible to prevent or suppress the spring-mass resonance system formed by the speaker body 102 and the guide member 40 from affecting the acoustics of the speaker 100.

[0051] As described above, the elastic properties of the rubber elastic body 51 and the inertial mass of the mass member 52 are set based on the natural frequency of the coil spring 30. Therefore, the dynamic vibration absorber 50 can prevent or suppress surging of the coil spring 30.

[0052] As described above, the insulator 1 according to the embodiment of the present invention can suppress the influence of vibrations of the speaker 100 to which the insulator 1 is applied.

[0053] Although the present invention has been described above through the above embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications and improvements can be made to the above embodiments. It is clear from the claims that such modifications and improvements can also be included within the technical scope of the present invention.

[0054] The above-described embodiments are intended to facilitate understanding of the present invention and are not intended to limit the scope of the present invention. Furthermore, the above-described embodiments do not limit the scope of the present invention, and the present invention may include any and all applications. The components of the above-described embodiments, as well as their arrangement, materials, conditions, shape, size, etc., are not limited to those illustrated and may be modified as appropriate. For example, the present invention includes differences that arise during implementation due to manufacturing tolerances, etc. Furthermore, components illustrated in different embodiments may be partially substituted or combined within the scope of technical inconsistency. Furthermore, the various configurations may be selectively combined as appropriate to achieve at least some of the above-described problems and effects.

[0055] For example, the dynamic vibration absorber 40 may be provided so as to act in the same manner on the lower case 20 instead of the upper case 10. In this case, the tubular portion 11 of the upper case 10 has the shape of the tubular portion 21 of the lower case 20 described above, and the tubular portion 21 of the lower case 20 has the shape of the tubular portion 11 of the upper case 10 described above. Therefore, the guide member 40 is fixed to the tubular portion 21 of the lower case 20, and slidably supports the tubular portion 11 of the upper case 10.

[0056] Furthermore, the application of the insulator according to the present invention is not limited to speakers. The insulator according to the present invention can be applied to various acoustic devices and sound sources that require vibration insulation and vibration damping. The insulator according to the present invention can also be applied to precision machinery and the like that require vibration insulation and vibration damping. [Explanation of symbols]

[0057] 1 insulator, 10 upper case (upper member), 11 cylindrical portion, 12 upper bottom portion, 13 support surface, 14 upper bottom surface, 14a support surface, 14b convex portion, 15 inner peripheral surface, 16 outer peripheral surface, 16a convex portion, 16b outer peripheral surface, 20 lower case (lower member), 21 cylindrical portion, 22 lower bottom portion, 23 installation surface, 24 lower bottom surface, 24a support surface, 24b convex portion, 25 flange surface, 26 inner peripheral surface, 27 outer peripheral surface, 30 coil spring (first elastic member), 31 upper end, 32 lower end, 40 guide member, 41 sliding surface, 42 fixed surface, 50 dynamic vibration absorbing portion, 51 rubber elastic body (second elastic member), 52 mass member, 53 inner peripheral surface, 54 outer peripheral surface, 100 speaker, 101 bottom surface, 102 speaker body, 110 installation base, 111 top surface, x-axis line

Claims

1. An upper member; A lower member and a first elastic member that is an elastic member; a guide member; the upper member and the lower member are opposed to each other via the first elastic member and are relatively movable in the opposing direction, the guide member is configured to guide the relative movement of the upper member and the lower member in the opposing direction, The guide member is fixed to one of the upper member and the lower member, and supports the other of the upper member and the lower member so as to be slidable in the opposing direction. Insulator.

2. Further provided with a dynamic vibration absorbing section, The dynamic vibration absorber is capable of vibrating relative to the upper member or the lower member in a direction intersecting the opposing direction. The insulator according to claim 1 .

3. The dynamic vibration absorbing portion is annular in the opposing direction and surrounds the upper member or the lower member from the outer periphery. The insulator according to claim 2 .

4. The dynamic vibration absorber includes a second elastic member that is an annular elastic member, and a mass member that is a mass body that surrounds the second elastic member from the outer periphery side. The insulator according to claim 2 or 3.

5. provided between an application object and an installation unit where the application object is installed; The elastic characteristics of the second elastic member in the intersecting direction and the inertial mass of the mass member are set based on a natural frequency of vibration of the application target in the intersecting direction. The insulator according to claim 4 .

6. the dynamic vibration absorber is capable of vibrating in the opposing directions, the elastic characteristics of the second elastic member and the inertial mass of the mass member in the opposing direction are set based on the natural frequency of the first elastic member. The insulator according to claim 5 .

7. The first elastic member is a spring member. The insulator according to claim 1 .

8. The second elastic member is a rubber member. The insulator according to claim 4 .

9. The guide member is a cylindrical member extending in the opposing direction. The insulator according to claim 1 .

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