Speakers and electronic devices

Abstract

An embodiment of the present technology relates to a speaker comprising a diaphragm. The diaphragm includes an upper-layer member and a reinforcing member. The upper-layer member has a first surface and a second surface on a side opposite the first surface. A plurality of drive points as a reference for transmission of vibrations are set at predetermined positions on the second surface. The reinforcing member includes a plurality of first reinforcing portions configured in the vicinity of each of the plurality of drive points, and one or more second reinforcing portions which, in a state of being spaced apart from the second surface, are configured to connect the plurality of first reinforcing portions. The reinforcing member is connected to the second surface of the upper-layer member.

Description

[Technical Field]

[0001] The present technology relates to a speaker and an electronic device. [Background technology]

[0002] Patent Document 1 discloses a speaker having a flat composite diaphragm with skins attached to both sides of a central core. By appropriately specifying the materials of the central core and skins of the composite diaphragm, it is possible to increase the divided vibration value. This improves the acoustic characteristics of the speaker (see, for example, lines 2 to 6 in the left column on page 3 of Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 63-999 Summary of the Invention [Problem to be solved by the invention]

[0004] Thus, there is a demand for technology that can improve the acoustic characteristics of speakers.

[0005] In view of the above circumstances, an object of the present technology is to provide a speaker and an electronic device that can exhibit high acoustic characteristics. [Means for solving the problem]

[0006] In order to achieve the above object, a speaker according to an embodiment of the present technology includes a diaphragm. The diaphragm has a surface member and a reinforcing member. The surface member has a first surface and a second surface opposite to the first surface, and a plurality of driving points that serve as references for transmitting vibrations are set at predetermined positions on the second surface. The reinforcing member has a plurality of first reinforcing portions configured near each of the plurality of driving points and one or more second reinforcing portions configured to connect between the plurality of first reinforcing portions while being spaced apart from the second surface, and is connected to the second surface of the surface member.

[0007] In this speaker, a reinforcing member is connected to a surface layer member. First reinforcing sections are configured near a plurality of driving points set on the surface layer member, and second reinforcing sections are configured to connect the first reinforcing sections. The second reinforcing sections are connected to the first reinforcing sections while being spaced apart from the surface layer member. This makes it possible to suppress the effects of natural vibrations and achieve high acoustic characteristics.

[0008] The speaker further includes an actuator and a plurality of transmission members. The actuator generates vibrations. The plurality of transmission members are arranged on the second surface side with respect to the plurality of driving points, and transmit vibrations generated by the actuators to the diaphragm. In this case, the first surface may have a planar shape, and each of the plurality of transmission members may transmit vibrations along a direction perpendicular to the first surface to the diaphragm.

[0009] The plurality of driving points may be set at positions of nodes of natural vibrations occurring in the surface layer member.

[0010] The plurality of first reinforcing portions may hold the plurality of transmission members.

[0011] One or more natural vibration suppression points may be set at predetermined positions on the second surface. In this case, the speaker may further include one or more natural vibration suppression units that are arranged on the second surface side relative to the one or more natural vibration suppression points and connected to the diaphragm.

[0012] The one or more natural vibration suppressing portions may be configured so that tension is not applied to the surface layer member along a direction perpendicular to the first surface.

[0013] The one or more second reinforcing portions may be arranged at positions facing the one or more natural vibration suppression points.

[0014] The one or more natural vibration suppressing portions may include a vibration damping member disposed between the second surface and the second reinforcing portion.

[0015] The one or more natural vibration suppression points may be set at positions of antinodes of natural vibrations occurring in the surface layer members.

[0016] The natural vibration may be at least one of a (2,0)+(0,2) mode natural vibration and a (2,2) mode natural vibration.

[0017] The reinforcing member may be configured by assembling a first member including the first reinforcing portion and a second member including the second reinforcing portion.

[0018] The plurality of drive points may be four drive points set symmetrically with respect to the center of the second surface. In this case, the plurality of first reinforcing portions may be four first reinforcing portions configured to surround each of the four drive points. Furthermore, the one or more second reinforcing portions may be four second reinforcing portions including two second reinforcing portions extending in a first direction and two second reinforcing portions extending in a second direction perpendicular to the first direction.

[0019] The surface member may have a rectangular shape when viewed from a direction perpendicular to the first surface, having two sides whose main direction is the first direction and two sides whose main direction is the second direction.

[0020] The one or more natural vibration suppression points may be set at the center of the second surface and at the midpoint between two adjacent driving points among the four driving points.

[0021] The surface layer member may be made of a metal material, a material having a property of suppressing higher-order natural vibration modes, or a material that is highly decorative.

[0022] The surface member may have at least one of an image display function and an illumination function.

[0023] The speaker may further include a substrate for driving the actuator disposed on the reinforcing member.

[0024] The reinforcing member may be formed by assembling a first member including the first reinforcing portion and a second member including the second reinforcing portion. In this case, the diaphragm may have a shielding part connected to the peripheral edge of the surface member and the peripheral edge of the first member, and shielding the inside of the speaker from outside air.

[0025] the first member has one or more through holes extending along a direction perpendicular to the first surface; The diaphragm may have a pin member connected to the second surface of the surface member and disposed to pass through the one or more through holes of the first member.

[0026] An electronic device according to an embodiment of the present technology includes the speaker and a control unit. The control unit controls driving of the speaker. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a schematic diagram showing a basic configuration of a speaker according to an embodiment of the present technology; [Figure 2] 3A and 3B are schematic diagrams showing examples of vibration modes of natural vibrations. [Figure 3] 10 is a graph showing vibration frequency-sound pressure characteristics (comparative example). [Figure 4] This is a diagram of the diaphragm as seen from the front side (front side). [Figure 5]This is a diagram of the diaphragm as seen from the back (rear side). [Figure 6] This is a diagram of the diaphragm as seen from an oblique direction on the back side (rear side). [Figure 7] FIG. 10 is a view of the surface layer member as seen from the back side. [Figure 8] FIG. 2 is a diagram of the first member as seen from the back side (rear side). [Figure 9] FIG. 10 is a diagram of the second member as viewed from the back side (rear side). [Figure 10] FIG. 1 is a schematic diagram showing the shape of a reinforcement structure obtained by optimization. [Figure 11] This is a diagram of the speaker as seen from the front side (front side). [Figure 12] FIG. 12 is a cross-sectional view taken along the line AA shown in FIG. [Figure 13] FIG. 2 is a perspective view of the speaker cut diagonally. [Figure 14] FIG. 2 is a cross-sectional view of the speaker taken along a diagonal line. [Figure 15] FIG. 10 is a diagram showing the state in which an edge is attached to a diaphragm, taken along a line passing through the center. [Figure 16] 1 is a diagram showing a state in which a driving bobbin and a vibration suppression bobbin are attached to a diaphragm, and is a diagram cut along a diagonal line passing through the center. FIG. [Figure 17] 10A and 10B are schematic diagrams for explaining a positioning step of the MC-ASSY. [Figure 18] FIG. 10 is a schematic diagram for explaining the positioning process of the MC-ASSY. [Figure 19] 10A and 10B are schematic diagrams for explaining a positioning step of the MC-ASSY. [Figure 20] 10A and 10B are schematic diagrams for explaining a positioning step of the MC-ASSY. [Figure 21] 10A and 10B are schematic diagrams for explaining a positioning step of the vibration suppression bobbin. [Figure 22] 10A and 10B are schematic diagrams for explaining a positioning step of the vibration suppression bobbin. [Figure 23]10A and 10B are schematic diagrams for explaining a positioning step of the vibration suppression bobbin. [Figure 24] 10A and 10B are schematic diagrams for explaining a positioning step of the vibration suppression bobbin. [Figure 25] 10A and 10B are schematic diagrams for explaining a step of positioning and adjusting the height of the drive bobbin. [Figure 26] 10A and 10B are schematic diagrams for explaining a step of positioning and adjusting the height of the drive bobbin. [Figure 27] 10A and 10B are schematic diagrams for explaining a step of positioning and adjusting the height of the drive bobbin. [Figure 28] 10 is a schematic diagram for explaining a height adjustment step of the DP-ASSY. FIG. [Figure 29] 10 is a schematic diagram for explaining a height adjustment step of the DP-ASSY. FIG. [Figure 30] 10 is a schematic diagram for explaining a height adjustment step of the DP-ASSY. FIG. [Figure 31] 10A to 10C are schematic diagrams for explaining a step of attaching a wiring substrate. [Figure 32] 10A and 10B are schematic diagrams for explaining a process of connecting the driving bobbin and the vibration suppression bobbin to the diaphragm. [Figure 33] FIG. 10 is a schematic diagram for explaining a surface member attachment step. [Figure 34] 10A and 10B are schematic diagrams for explaining a process of attaching a terminal board. [Figure 35] 10 is a graph showing vibration frequency-sound pressure characteristics (the present embodiment). [Figure 36] 10A and 10B are schematic diagrams showing other variations of the diaphragm. [Figure 37] 1 is a schematic diagram showing an example of an electronic device equipped with a speaker according to the present technology; DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, embodiments of the present technology will be described with reference to the drawings.

[0029] [Basic speaker configuration] FIG. 1 is a schematic diagram showing a basic configuration of a speaker according to an embodiment of the present technology. The speaker 100 includes a diaphragm 5, a plurality of transmission members 6, and an actuator . The diaphragm 5 has a surface layer member 9 and a reinforcing member 10. The surface member 9 has a radiation surface 9a having a planar shape and an internal surface 9b opposite to the radiation surface 9a. The radiation surface 9a and the internal surface 9b correspond to an embodiment of the first surface and the second surface according to the present technology. The reinforcing member 10 is a member that reinforces the structure of the diaphragm 5, and is connected to the inner surface 9b of the surface member 9. The reinforcing member 10 will be described in detail later.

[0030] The actuator 7 is capable of generating vibrations. For example, an electromagnetic actuator that has a permanent magnet and a voice coil and generates vibrations by the action of a magnetic circuit is used as the actuator 7. However, without being limited to this, any actuator may be used, such as a piezoelectric actuator that uses a piezoelectric element.

[0031] The plurality of transmission members 6 are arranged on the inner surface 9b side of the surface layer member 9, and transmit the vibration generated by the actuator 7 to the diaphragm 5. The plurality of transmission members 6 are arranged with reference to a plurality of driving points, which will be described later. The plurality of transmission members 6 are connected, for example, to the reinforcing member 10. Without being limited to this, the plurality of transmission members 6 may be connected to both the reinforcing member 10 and the surface layer member 9. Alternatively, the plurality of transmission members 6 may be connected only to the surface layer member 9. Furthermore, for example, each of the plurality of transmission members 6 is connected to a vibration output unit (not shown) that outputs vibration of the actuator 7. Alternatively, a link mechanism capable of transmitting vibration may be configured between the vibration output unit of the actuator 7 and the plurality of transmission members 6. For example, any link mechanism may be used, such as a Scott-Russell type rigid linear motion mechanism or a lazy-tong type link mechanism. Alternatively, the vibration output portion of the actuator 7 may be directly connected to the diaphragm 5. In this case, the actuator 7 itself also functions as the transmission member 6.

[0032] In the present disclosure, the configuration and method for connecting and fixing a member to another member are not limited, and any method may be used, such as adhesion using an adhesive material, welding, or connection using a locking member such as a screw.

[0033] 1, in this embodiment, each of the multiple transmission members 6 transmits vibration V1 along a direction perpendicular to the radiation surface 9a of the surface layer member 9 to the diaphragm 5. As a result, a wavefront close to a plane wave is output from the radiation surface 9a. Hereinafter, the direction perpendicular to the radiation surface 9a of the surface layer member 9 is referred to as the Z direction. The radiation side of the plane wave may be referred to as the upper side or the front side (front side), and the side opposite the radiation side may be referred to as the lower side or the back side (rear side). The radiation surface 9a of the surface member 9 is set to be in the XY plane direction.

[0034] The speaker diaphragm may be made of various shapes and materials. A diaphragm 5 having a flat radiation surface 9a that radiates sound toward the listener, such as the speaker 100 according to this embodiment, can form a wavefront that is close to a plane wave. Hereinafter, such a speaker will be referred to as a planar speaker. If a wavefront close to a plane wave can be formed, it will have a different directivity than a cone-shaped diaphragm, which forms a wavefront close to a spherical wave. An ideal plane wave has sharp directionality, and sound is emitted only forward, perpendicular to the radiation surface. Also, when considering a point away from the speaker, compared to a spherical wave, which radiates in a spherical shape and requires consideration of diffusion over distance, a plane wave has less attenuation of sound pressure over distance from the speaker (this is due only to attenuation due to the viscoelasticity of the air). Therefore, planar speakers are very effective when you want to project sound only to a specific area or when you want to project sound to listeners at a distance.

[0035] When making a flat panel speaker, there are various methods for driving the diaphragm, i.e., transmitting vibrations. Among these, the method of driving a few points has a cost advantage over the method of driving the entire surface, as it reduces the number of expensive actuator parts in the entire speaker. Furthermore, it is easier to ensure a vibration stroke by using a magnetic circuit in which the voice coil is positioned perpendicular to the magnetic gap, rather than a planar magnetic field type magnetic circuit, which is sometimes used when moving the entire surface. On the other hand, with a drive method that drives only a few points on the diaphragm, the area on the diaphragm to which the driving force is applied is reduced, making it easier to excite split vibrations.Furthermore, compared to diaphragms that originally have a cone shape, flat speakers have lower diaphragm strength, making them more susceptible to split vibrations. Note that divided vibration means that different vibration components are generated in multiple regions of the diaphragm due to natural vibration, resulting in behavior that differs from uniform vibration in which the entire diaphragm vibrates uniformly. When split vibration occurs in the diaphragm, it often creates peaks or dips in the sound pressure in the resonance band and also affects the directivity. For these reasons, suppressing split vibration is important for improving the performance of flat panel speakers. As disclosed in Patent Document 1, it is possible to suppress the split vibration by a material approach. This technology makes it possible to suppress split vibrations through a newly devised structural approach. Specifically, the new structural approach makes it possible to increase the resonance frequency.

[0036] FIG. 2 is a schematic diagram showing an example of a vibration mode of natural vibration. Ten vibration modes from the fundamental mode of a free-edge square plate are shown in Figure 2. The values ​​below the diagram are the relative frequencies from the fundamental mode. When considering the external shape of a speaker's diaphragm, a square shape is often adopted to improve ease of installation in the device into which the speaker is incorporated and to increase the proportion of the diaphragm area on the baffle surface when multiple speakers are lined up. The edge attached to the outer periphery of the diaphragm for the purpose of separating the air in front of the diaphragm (the listener side) and the back side (the inside of the device, the drive actuator side) is assumed to be soft enough not to impede the piston motion of the diaphragm. In this case, the diaphragm can be considered to vibrate at its free end, and it is known to exhibit the natural vibration mode shown in Figure 2.

[0037] FIG. 3 is a graph showing the frequency-sound pressure characteristics of vibration. A speaker was created by attaching four actuators to a square diaphragm (without reinforcing members), and the diaphragm was driven to emit sound. At that time, the natural vibration of the (2,0) + (0,2) mode shown in Figure 2 was observed around 1 kHz, and the natural vibration of the (2,2) mode shown in Figure 2 was observed around 4 kHz. As shown in Figure 3, peaks and dips in sound pressure occurred at frequencies where natural vibrations were observed. Additionally, at frequencies where natural vibrations were observed, sound pressure decreased in the front direction relative to the diaphragm. In this technology, by realizing an appropriate reinforcement structure using the surface layer member 9 and the reinforcement member 10 shown in FIG. 1, it has become possible to sufficiently reduce the influence of the natural vibration shown in FIG.

[0038] In explaining this technology, first, the natural vibration of the (2,0)+(0,2) mode and the natural vibration of the (2,2) mode will be taken as examples of natural vibrations targeted for suppression. In the natural vibration mode shown in Figure 2, the lines inside the squares are the nodes of the natural vibration, and the central part of the area bounded by the lines is the antinode of the natural vibration. It is difficult to suppress the effects of natural vibrations in natural vibration modes that are connected by curved lines (nodes), such as the (2,0)+(0,2) mode, or natural vibration modes that are lattice-shaped lines (nodes), such as the (2,2) mode. With this technology, it is possible to sufficiently suppress the influence of such natural vibration modes. Of course, the application of this technology is not limited to these natural vibration modes, and the technology described below can be applied to other natural vibration modes.

[0039] 4 to 9 are schematic diagrams showing examples of the configuration of the diaphragm 5. In FIG. 4 is a diagram of the diaphragm 5 as viewed from the front side (front face side). In FIG. 4, the members arranged on the back side of the surface layer member 9 are also shown. FIG. 5 is a diagram of diaphragm 5 as viewed from the back side (rear side). FIG. 6 is a diagram of the diaphragm 5 when viewed obliquely from the rear side (back surface side). Fig. 7 is a diagram of the surface member 9 as seen from the back side, and can also be considered a front view of the inner surface 9b. FIG. 8 is a diagram of the first member as seen from the back side (rear side). FIG. 9 is a diagram of the second member as viewed from the back side (rear side).

[0040] The diaphragm 5 has a surface layer member 9, a reinforcing member 10, and a vibration damping member 14. In this embodiment, the surface layer member 9 and the reinforcing member 10 are formed separately, and the reinforcing member 10 is connected to the inner surface 9b of the surface layer member 9. That is, the diaphragm 5 has a two-layer structure of the surface layer member 9 and the reinforcing member 10. The reinforcing member 10 is formed by assembling a first member 11 shown in Fig. 8 and a second member 12 shown in Fig. 9. Therefore, the diaphragm 5 can also be considered to have a three-layer structure consisting of the surface member 9, the first member 11, and the second member 12. Of course, the present invention is not limited to this configuration.

[0041] The surface member 9 has an emission surface 9a that emits a plane wave and an internal surface 9b. The emission surface 9a and the internal surface 9b each have a planar shape. As shown in FIG. 7, the surface layer member 9 has a substantially rectangular shape when viewed in a direction perpendicular to the radiation surface 9a (Z direction), and in this embodiment, has a substantially square shape. The surface layer member 9 has two sides 9c extending in a first direction and two sides 9d extending in a second direction perpendicular to the first direction. The four corners of the surface layer member 9 are curved. That is, the peripheral edge 13 of the surface layer member 9 is a square with four rounded corners. In the present disclosure, such a shape is considered to be substantially rectangular (square). The two sides 9c correspond to sides whose main direction is the first direction, and the two sides 9d correspond to two sides whose main direction is the second direction. Hereinafter, the extending direction (first direction) of the side portion 9c is defined as the X direction, and the extending direction (second direction) of the side portion 9d is defined as the Y direction. Of course, the directions are not limited to these settings.

[0042] As shown in FIG. 7, a plurality of driving points DP are set at predetermined positions on the inner surface 9b. The driving point DP is a point that serves as a reference for the transmission of the driving force. For example, the driving point DP is set as a point to which the vibration V1 along the Z direction is directly transmitted. However, the driving point DP may be set as a reference point at which the transmission member 6 that transmits the vibration V1 is disposed. Therefore, there may be cases where the vibration V1 is transmitted not to the driving point DP but to an area based on the driving point DP, such as a peripheral area of ​​the driving point DP.

[0043] The driving points DP are set at the positions of the nodes of the natural vibration occurring in the surface layer member 9. In this embodiment, four driving points DP are set at the positions of the nodes of the (2,0)+(0,2) mode. Specifically, the intersection of the first side 9c and the second side 9d is the vertex of the square, and driving points DP are set on the two diagonals of the square at the positions of the nodes (lines) of the (2,0)+(0,2) mode. Therefore, four driving points DP are set symmetrically with respect to the center of the inner surface 9b. Setting the driving point DP at the position of the node of the natural vibration to be suppressed is advantageous in suppressing the divided vibration. Setting the driving point DP symmetrically with respect to the center of the surface layer member 9 is also advantageous in suppressing the divided vibration. The number and positions of the driving points DP are not limited and may be set arbitrarily.

[0044] In this embodiment, one or more natural vibration suppression points (hereinafter simply referred to as vibration suppression points) SP are set at predetermined positions on the inner surface 9b. The vibration suppression point SP is a reference point for suppressing the natural vibration component. For example, the vibration suppression point SP is set as a point for directly suppressing the natural vibration component. However, the present invention is not limited to this, and the vibration suppression point SP may be set as a reference point for arranging a member, mechanism, or the like for suppressing the natural vibration component. Therefore, there may be cases where the effect of suppressing the natural vibration component is exerted not on the vibration suppression point SP but on an area based on the vibration suppression point SP, such as an area around the vibration suppression point SP.

[0045] The vibration suppression points SP are set at the positions of the antinodes of the natural vibration generated in the surface layer member 9. In this embodiment, the vibration suppression points SP are set at the positions of the antinodes of the (2,0)+(0,2) mode and the (2,2) mode. Specifically, a vibration suppression point SP1 is set at the center of the inner surface 9b, and four vibration suppression points SP2 are set at the centers between two adjacent driving points DP among the four driving points DP. Setting the vibration suppression point SP at the position of the antinode of the natural vibration to be suppressed is advantageous for suppressing the divided vibration. The number and positions of the vibration suppression points SP are not limited and may be set arbitrarily.

[0046] 2 illustrates the natural vibration mode of a square plate at the free end. When the reinforcing member 10 is connected to the surface layer member 9 as in this embodiment, the positions of the nodes and antinodes may differ. In this case, the driving point DP and the vibration suppression point SP may be set by calculating the positions of the nodes and antinodes of the natural vibration to be suppressed, for example, by simulation.

[0047] The surface layer member 9 is made of, for example, a metal material, a material having the property of suppressing higher-order natural vibration modes, or a material that is highly decorative. Of course, a material that simultaneously satisfies any number of the three conditions of "being a metal material," "being a material that has the property of suppressing higher-order natural vibration modes," and "being a material that is highly decorative" may be used. Examples of the metal material include aluminum alloys, etc. By using a metal material, it is possible to increase the resonant frequency at which natural vibration occurs. Materials that have the property of suppressing higher-order natural vibration modes include, for example, paper with large internal loss and high rigidity, and carbon panels which are themselves composite materials. Examples of materials with high decorative properties include printed boards and cloth. By using materials with high decorative properties, it is possible to improve the design of the radiation surface 9a in particular. As a result, it is possible to improve the design of the diaphragm 5 and the speaker 100. The thickness of the surface layer member 9 is designed to be in the range of 0.5 mm to 2 mm, for example. This makes it possible to realize a thin flat speaker. Of course, the thickness of the surface layer member 9 is not limited and may be designed arbitrarily.

[0048] Here, the structure of the first member 11 and the second member 12 that constitute the reinforcing member 10 will be considered. The (2,0)+(0,2) mode, also known as the ring mode, is a mode in which the central part of the diaphragm and its outer part vibrate in opposite phases. At frequencies where the (2,0)+(0,2) mode occurs, the parts moving in opposite phases vibrate in such a way that they cancel out the sound waves radiated by each other, resulting in a decrease in radiated sound pressure. To suppress the (2,0)+(0,2) mode, four driving points DP are set at the node positions of the natural vibration mode for a substantially square flat plate member, similar to the surface layer member 9 shown in Fig. 7. In addition, a vibration suppression point SP1 is set at the center, which is the position of the antinode of the natural vibration mode. As will be explained later, when constructing speaker 100, drive bobbins are arranged based on four drive points DP. Also, a natural vibration suppression bobbin (hereinafter simply referred to as a vibration suppression bobbin) that is connected only to a damper that does not have a drive system is arranged based on vibration suppression point SP1.

[0049] The shape and structure of the diaphragm are optimized to increase the resonant frequency under the condition that the driving point DP where the driving bobbin is located is regarded as fixed, and a mass is placed at the vibration suppression point SP1 where the vibration suppression bobbin is used. The optimization method used is topology optimization or shape optimization. The front of the diaphragm is kept flat, and a reinforcement structure is provided on the internal surface where sound is radiated only to the interior of the device. At this time, the design domain for optimization is set to an area that avoids the diaphragm's stroke range and other speaker unit components such as the magnetic circuit and frame, and to give the diaphragm a certain thickness in the depth direction when viewed from the front.

[0050] FIG. 10 is a schematic diagram showing the shape of the reinforcement structure obtained by optimization. FIG. 10A is a diagram seen from the front side, illustrating the shape of the reinforcing member formed on the back side of the flat plate member. FIG. 10B is a view from the back side, showing the shape of the reinforcing member on the inner surface. The optimization results shown in Figures 10A and 10B led to the following findings. By reinforcing the areas near the four driving points DP, it is possible to increase the resonant frequency. By providing reinforcement to connect multiple driving points DP, it is possible to increase the resonance frequency. In other words, when looking at a certain driving point DP, a beam-like reinforcement structure is effective in pointing toward the adjacent driving point DP. The beam-shaped reinforcing structure is configured to be spaced apart from the approximately square flat plate member. In other words, a gap (air gap) is formed between the flat plate member and the reinforcing structure. This makes it possible to suppress excessive weight increase and improve the weight-to-efficiency ratio. As a result, it is advantageous for increasing the resonant frequency.

[0051] In the (2,2) mode, nodes (lines) appear in a lattice pattern, and the areas between them become antinodes. We continued to study the suppression of the natural vibration components that occur at the antinode positions, taking into account the above findings. As a result, we obtained the following findings. A beam-like reinforcing structure configured in a state separated from the planar member is configured to face the position of the antinode of the (2,2) mode. In other words, the beam-like reinforcing structure is configured in a shape that passes through the back side of the antinode of the (2,2) mode. A vibration-damping member made of a material with a damping effect is then sandwiched in the gap between the planar member and the beam-like reinforcing structure, which makes it possible to suppress the natural vibration component. Based on the above findings, a new configuration of the reinforcing member 10 consisting of the first member 11 and the second member 12 has been devised. This will be explained in detail below.

[0052] FIG. 8 illustrates the positions of a plurality of driving points DP and vibration suppression points SP relative to the first member 11 when the speaker 100 is assembled. As shown in FIG. 8, the first member 11 has a peripheral edge support portion 15 and four reinforcing portions (hereinafter referred to as first reinforcing portions) 16. The peripheral edge support portion 15 has a ring shape with a hollow interior. When viewed from the Z direction, the outer shape of the peripheral edge support portion 15 is a substantially rectangular shape that is larger than the outer shape of the surface layer member 9.

[0053] The four first reinforcing portions 16 are formed on the inner side of the peripheral edge support portion 15 . The first reinforcing portions 16 are configured near each of a plurality of driving points DP defined on the inner surface 9b of the surface layer member 9. In this embodiment, four first reinforcing portions 16 are configured to correspond to the four driving points DP, respectively. 8, when viewed from the Z direction, the four first reinforcing portions 16 have a ring shape and are configured to surround each of the four driving points DP. For example, the first reinforcing portions 16 are configured so that the center of the inner circle 16a of each first reinforcing portion 16 coincides with the driving point DP. The four first reinforcing portions 16 function as a reinforcing structure that reinforces the vicinity of the driving point DP shown in Fig. 10. The configuration of the first reinforcing portions 16 is not limited, and any configuration that can reinforce the vicinity of the driving point DP may be adopted.

[0054] FIG. 9 illustrates the positions of a plurality of driving points DP and vibration suppression points SP relative to the second member 12 when the speaker 100 is assembled. As shown in FIG. 9, the second member 12 has a central support portion 18, four connecting portions 19, an inner rib portion 20, an outer rib portion 21, and four reinforcing portions (hereinafter referred to as second reinforcing portions) 22. The central support part 18 is connected to the center of the inner surface 9b of the surface layer member 9. When viewed from the Z direction, the central support part 18 has a ring shape and is configured to surround the vibration suppression point SP1. For example, the central support part 18 is configured so that the center of the inner circle 18a of the central support part 18 coincides with the vibration suppression point SP1.

[0055] The four connecting portions 19 are connected to the four first reinforcing portions 16 of the first member 11 . The four connecting portions 19 have an arc shape when viewed from the Z direction. The four connecting portions 19 are connected to the side surfaces of the four first reinforcing portions 16, respectively. The four connecting portions 19 are connected to the inner surface 9b of the surface member 9. That is, the four connecting portions 19 are connected to the vicinity of four driving points DP set on the inner surface 9b of the surface member 9.

[0056] The inner rib portion 20 is configured to connect the central support portion 18 and the four connecting portions 19. When viewed from the Z direction, the inner rib portion 20 extends radially from the central support portion 18 toward the periphery and is connected to the four connecting portions 19. The inner rib portion 20 is connected to the inner surface 9 b of the surface layer member 9 .

[0057] The outer rib portions 21 are configured to extend from the four connecting portions 19 toward the peripheral edge side. The outer rib portion 21 is connected to the inner surface 9 b of the surface layer member 9 .

[0058] The four second reinforcing portions 22 are configured to connect the plurality of first reinforcing portions 16 while being spaced apart from the inner surface 9b of the surface layer member 9. In other words, a gap is formed between the second reinforcing portions 22 and the inner surface 9b. The second reinforcing portion 22 has a beam structure that connects two adjacent first reinforcing portions 16 among the four first reinforcing portions 16. The four second reinforcing portions 16 function as beam-shaped reinforcing members shown in FIG. In this embodiment, the second reinforcing portion 22 is connected to the first reinforcing portion 16 via four connecting portions 19 . The connecting portion 19 can also be considered as a member that reinforces the vicinity of the driving point DP. That is, one embodiment of the first reinforcing portion according to the present technology may be realized by the connecting portion 19 and the first reinforcing portion 16. In this case, the second reinforcing portion 22 is directly connected to the first reinforcing portion.

[0059] 9, in this embodiment, the four second reinforcing portions 22 are composed of two second reinforcing portions 22a extending in the X direction (first direction) and two second reinforcing portions 22b extending in the Y direction (second direction) perpendicular to the X direction. When viewed from the Z direction, the four second reinforcing portions 22 are arranged so as to surround the center (vibration suppression point SP1) of the inner surface 9b of the surface layer member 9. The four second reinforcing portions 22 are arranged at positions facing the four vibration suppression points SP2 set on the inner surface 9b. That is, when viewed from the Z direction, the four second reinforcing portions 22 are arranged to pass behind the four vibration suppression points SP2. The configuration of the second reinforcing portion 22 is not limited, and any beam structure that connects the first reinforcing portions 16 may be employed. In this embodiment, the central support portion 18, the four connecting portions 19, the inner rib portion 20, and the outer rib portion 21, other than the second reinforcing portion 22, are connected to the inner surface 9b of the surface layer member 9. This makes it possible to sufficiently support the surface layer member 9.

[0060] 4 to 6, the vibration damping member 14 is disposed between the inner surface 9b of the surface layer member 9 and the second reinforcing portion 22. The vibration damping member 14 is connected to both the inner surface 9b and the second reinforcing portion 22 so as to fill the gap between the inner surface 9b and the second reinforcing portion 22. The specific configuration of the vibration damping member 14 is not limited, and any configuration such as a viscous gel or elastomer may be employed. The vibration damping member 14 is disposed on the inner surface 9b side with respect to the vibration suppression point SP, and functions as one or more natural vibration suppression parts connected to the diaphragm 5. The natural vibration suppressing portion is configured so as to be able to suppress the natural vibration component without interfering with the radiation of plane waves from the surface layer member 9. Specifically, the vibration suppression section is arranged so that tension in the Z direction is not applied to the surface layer member 9. In other words, the vibration suppression section is configured so that excessive force is not applied to the front or back side in a static state where no vibration is transmitted to the diaphragm 5. 6 and other examples is configured so that its height is the same as the width between the inner surface 9b and the second reinforcing portion 22 when the diaphragm 5 is in a resting state. The vibration damping member 14 is then bonded between the inner surface 9b and the second reinforcing portion 22 without being compressed or stretched. This prevents tension from acting to move the inner surface 9b closer to or farther away from the second reinforcing portion 22. As a result, it is possible to suppress the natural vibration component without interfering with the radiation of plane waves from the surface layer member 9.

[0061] The first member 11 and the second member 12 are made of a metal material such as an aluminum alloy. For example, the first member 11 and the second member 12 can be produced by cutting from a plate material. In this embodiment, the first member 11 and the second member 12 are configured as separate members. Therefore, it is easy to produce each of the first member 11 and the second member 12 by cutting from only one side. As a result, it is possible to sufficiently suppress the occurrence of warping and the like, and it is possible to produce the first member 11 and the second member 12, which are thin-walled parts, with high precision. The manufacturing method is not limited to this, and the first member 11 and the second member 12 may be manufactured by casting, die casting, pressing, etc. The first member 11 and the second member 12 may also be manufactured integrally. In other words, the reinforcing member 10 may be manufactured without being divided into two parts. The first member 11 and the second member 12 may be made of a material having properties that suppress higher-order natural vibration modes, similar to the surface layer member 9. Of course, the surface layer member 9, the second member 11, and the second member 12 may be made of the same material.

[0062] In this embodiment, a beam structure is realized by the second reinforcing portion 22. As shown in FIG. 6 and other figures, the second reinforcing portion 22 and the connecting portions 19 at both ends thereof form a U-shape that opens to the front side. The U-shaped portion is closed from the front side by the surface layer member 9. This realizes a beam structure in which a cavity is formed between the surface layer member 9 and the second reinforcing portion 22. When the surface layer member 9 and the reinforcing member 10 are made integrally, an under portion (a cavity between the surface layer member 9 and the second reinforcing portion 22) is generated, making it difficult to make by molding or cutting, or the processing costs would increase significantly. In this embodiment, a multi-layer structure is adopted, which includes a surface layer member 9 and a reinforcing member 10. Therefore, it is possible to easily produce the diaphragm 5 at low cost. It is also possible to produce the diaphragm 5 with high precision. Of course, the present technology is also applicable to the case where the surface layer member 9 and the reinforcing member 10 are integrally configured. That is, in the present disclosure, the form of connecting members includes the case where these members are integrally formed and connected.

[0063] [Speaker configuration example] 11 to 16 are schematic diagrams showing configuration examples of the speaker 100. FIG. 11 is a view of the speaker 100 as seen from the front side (front face side). In FIG. 11, the members arranged on the back side of the surface layer member 9 are also shown. FIG. 12 is a cross-sectional view taken along the line AA shown in FIG. FIG. 13 is a perspective view of the speaker 100 cut along a diagonal line. FIG. 14 is a cross-sectional view of the speaker 100 taken along a diagonal line. FIG. 15 is a diagram showing a state in which an edge is attached to diaphragm 5, and is a diagram cut along a line passing through the center along the Y direction. FIG. 16 is a diagram showing a state in which a driving bobbin and a vibration suppression bobbin are attached to diaphragm 5, and is a diagram cut along a diagonal line passing through the center.

[0064] The speaker 100 includes a diaphragm 5 , a frame 25 , four drive bobbins 26 , four actuators 27 , a vibration suppression bobbin 28 , two dampers 29 , and an edge 30 .

[0065] The frame 25 has a peripheral base portion 25a and a bottom base portion 25b (see FIG. 18). The peripheral base portion 25a has a ring shape with a hollow interior. When viewed from the Z direction, the outer shape of the peripheral base portion 25a is a substantially rectangular shape that is larger than the outer shape of the surface layer member 9. The bottom surface base portion 25b is connected to the peripheral edge base portion 25a and is configured to form a recess facing the opposite side (back side) from the side where the plane wave is emitted. The bottom base portion 25b is formed with four holding portions 32 for holding the four actuators 27, and a central hole 33 in which the two dampers 29 are attached. The frame 25 is made of a metal material such as iron or aluminum, but is not limited to this.

[0066] The four driving bobbins 26 are connected to four first reinforcing portions 16 provided on the first member 11 of the diaphragm 5. Specifically, the upper ends of the driving bobbins 26 are inserted into and connected to the inner circles 16a of the first reinforcing portions 16. The four drive bobbins 26 are connected to the first reinforcing portion 16 so that the centers of the bobbins coincide with the drive points DP set on the inner surface 9b of the surface member 9. The drive bobbin 26 is made of a metal material such as aluminum, but is not limited to this and any other material such as a resin material may be used. In this embodiment, the four drive bobbins 26 function as the multiple transmission members 6 shown in Fig. 1. As such, in this embodiment, the multiple first reinforcing portions 16 hold the multiple transmission members 6. The first reinforcing portions 16 achieve the optimization result shown in Fig. 10, making it possible to sufficiently suppress split vibration.

[0067] The four actuators 27 are attached to the four holding portions 32 of the frame 25, respectively. In this embodiment, an electromagnetic actuator is used as the actuator 27. As shown in FIGS. 12 and 14, the actuator 27 includes a yoke 35, a pole piece 36, an outer plate 37, an inner magnet 38, an outer magnet 39, and a voice coil 40. The voice coil 40 is wound around a driving bobbin 26 connected to the first reinforcing portion 16 . A voice coil 40 is inserted into the magnetic gap formed between the pole piece 36 and the outer plate 37 . By driving the actuator 27, it becomes possible to vibrate the voice coil 40 and the drive bobbin 26 along the Z direction due to electromagnetic induction. As a result, it becomes possible to transmit vibration V1 along the Z direction to the diaphragm 5 via the drive bobbin 26. The four actuators 27 are driven in synchronization with one another. That is, the four actuators 27 are driven so that the same vibration V1 is transmitted in the Z direction to the diaphragm 5. This achieves uniform vibration of the surface layer member 9, thereby exhibiting high acoustic characteristics. The four actuators 27 function as the actuators 7 shown in FIG.

[0068] In this embodiment, the components up to the voice coil 40 have been described as components of the actuator 27. Therefore, a configuration is adopted in which the actuator 7 (actuator 27) shown in Fig. 1 is connected to the transmission member 6 (drive bobbin 26) shown in Fig. 1. On the other hand, the vibration generated by the actuator 27 is output by the drive bobbin 26 to which the voice coil 40 is attached. Therefore, the drive bobbin 26 can also be regarded as a vibration output unit, which is a component of the actuator 27. In this case, the vibration output portion (drive bobbin 26) of the actuator 7 (actuator 27) can be considered to function as the transmission member 6 shown in FIG.

[0069] The vibration suppression bobbin 28 is connected to a central support portion 18 provided on the second member 12 of the diaphragm 5. Specifically, the upper end of the vibration suppression bobbin 28 is inserted into and connected to an inner circle 18a of the central support portion 18. The vibration suppression bobbin 28 is connected to the central support portion 18 so that the center of the bobbin coincides with a vibration suppression point SP1 set on the inner surface 9b of the surface layer member 9. The vibration suppression bobbin 28 is made of a metal material such as aluminum, but is not limited to this and any other material such as a resin material may be used.

[0070] Each of the two dampers 29 is capable of damping vibrations. The two dampers 29 are made up of an inner damper 29a and an outer damper 29b. The two dampers 29 are configured to connect the vibration suppression bobbin 28 and the central hole 33 of the frame 25. That is, the outer circumferential sides of the two dampers 29 are connected to the inside of the central hole 33 of the frame 25. Also, the inner circumferential sides of the two dampers 29 are connected to the side surfaces of the vibration suppression bobbin 28. The material of the damper 29 is not limited, and any material capable of exhibiting a damping function may be used.

[0071] The vibration suppression bobbin 28 and the two dampers 29 are arranged on the inner surface 9b side with respect to the vibration suppression point SP1, and function as a natural vibration suppression section connected to the diaphragm 5. As described above, the natural vibration suppressing portion is disposed so that tension is not applied to the surface layer member 9 along the Z direction. In this embodiment, two dampers 29 that are not connected to the drive system are used. Then, vibration suppression bobbins 28 connected to the two dampers 29 are connected to the central support part 18 of the second member 12 so that excessive force is not applied to the front or back side of the diaphragm 5 when the diaphragm 5 is in a stationary state. This makes it possible to suppress the natural vibration component without interfering with the radiation of plane waves from the surface layer member 9. Note that any other configuration may be adopted as a configuration for realizing the vibration suppression section.

[0072] The edge 30 has an inner periphery 30a and an outer periphery 30b. When viewed from the Z direction, the shape of the inner peripheral portion 30a and the outer peripheral portion 30b is a substantially rectangular shape in which the outer shape of the surface layer member 9 is enlarged. The inner periphery 30a of the edge 30 is connected to the peripheral support portion 15 of the first member 11. The inner periphery 30a of the edge 30 is also connected to the peripheral portion 13 of the surface layer member 9, which includes the four side portions 9c and 9d. 12 and 14, the peripheral support portion 15 of the first member 11 is connected to the back side of the inner peripheral portion 30a of the edge 30. The peripheral portion 13 of the surface layer member 9 is connected to the front side of the inner peripheral portion 30a. In other words, the inner peripheral portion 30a of the edge 30 is supported by being sandwiched between the first member 11 and the surface layer member 9 along the Z direction. This makes it possible to sufficiently prevent air from passing through the front and rear surfaces of the diaphragm 5, thereby enabling high acoustic characteristics to be exhibited. The peripheral support portion 15 of the first member 11 corresponds to the peripheral portion of the first member 11.

[0073] The outer periphery 30 b of the edge 30 is connected to the peripheral base portion 25 a of the frame 25 . The material of the edge 30 is, for example, a plastic material such as urethane, but is not limited to this. In this embodiment, the edge 30 functions as a shielding component that shields the inside of the speaker 100 from the outside air. Other components may be used as the shielding component.

[0074] In this embodiment, the speaker 100 is provided with a plurality of pin members 45 and a plurality of substrates 46. 4, 5, and 8, eight through holes 47 extending along the Z direction are formed in the first member 11. The eight through holes 47 are formed on the outer periphery side of the driving points DP. In this embodiment, the eight through holes 47 are formed in pairs at each of the four corners of the peripheral support part 15, near the first reinforcing part 16. A pin member 45 is inserted into a through hole 47 formed in the first member 11 . As shown in FIG. 7, the pin members 45 are connected to the four corners of the inner surface 9b of the surface layer member 9. In this way, the pin member 45 having one end connected to the surface layer member 9 is attached by being inserted into the through hole 47 formed in the first reinforcing member 11. This makes it possible to adequately support the peripheral edge portion 13 of the surface layer member 9, that is, the portion on the outer periphery side of the driving point DP, and to adequately suppress the divided vibration. Furthermore, as shown in FIG. 14, in this embodiment, the length of the pin member 45 is appropriately defined. For example, suppose that the amplitude of diaphragm 5 exceeds a predetermined distance when it moves toward actuator 27. In such a case, the length of pin member 45 is specified so that pin member 45 comes into contact with frame 25 and the members that make up the magnetic circuit before drive bobbin 26 comes into contact with yoke 35 that makes up the magnetic circuit. In this way, by using the pin member 45 as a stopper, it is possible to protect the lower end of the drive bobbin 26. That is, it is possible to prevent damage to the actuator 27 due to excessive amplitude. The pin member 45 is made of, for example, a metal material or a material having a property of suppressing higher-order natural vibration modes, similar to the surface layer member 9. Of course, the pin member 45 may be made of a material different from that of the surface layer member 9. The pin member 45 and the surface layer member 9 may be formed integrally. In FIG. 6, the through-holes 47 formed in the first member 11 are omitted from the illustration.

[0075] The plurality of substrates 46 are substrates for driving the actuators 27 installed on the reinforcing member 10. In this embodiment, the plurality of boards 46 include four terminal boards 46a mounted on the frame 25 and four wiring boards 46b mounted on the reinforcing member 10 (see FIGS. 31 and 34). The four terminal boards 46a are disposed on the periphery of the bottom base portion 25b of the frame 25, at intermediate positions between the four holding portions 32. The four wiring boards 46b are mounted on the four second reinforcing parts 22 of the second member 12. The wiring boards 46b are respectively disposed on the rear side of the vibration damping members 14 disposed on the second reinforcing parts 22. Note that Fig. 11 illustrates the wiring boards 46b disposed on the rear side of the second reinforcing parts 22. In this embodiment, tinsel wire is used to form wiring for driving the actuator 27. By providing the wiring board 46b on the second reinforcing portion 22, wiring becomes easier and the assembly process of the speaker 100 can be simplified. Furthermore, the terminal board 46a is disposed at a position on the outside of the wiring board 46b, and the other end of the tinsel wire is connected to the terminal board 46a. This also has the advantage of making wiring easier. The position where the wiring board 46b is provided is not limited to a specific position in the reinforcing member 10. The wiring board 46b may be provided at a position different from the second reinforcing portion 22. The wiring board 46b can also be called a landing board. When tinsel wire is used for wiring, in order to prevent short circuits, electrically conductive parts cannot be placed in the path that the tinsel wire can move. By using electrically non-conductive materials for the parts of the surface member 9 and the reinforcing member 10 that may come into contact with the tinsel wire, or by applying surface treatments such as painting or anodizing, it is possible to sufficiently prevent short circuits.

[0076] [Speaker manufacturing method] An example of a method for manufacturing the speaker 100 will be described with reference to FIGS. The XYZ coordinates in the drawing correspond to the XYZ coordinates set for the diaphragm 5 and the speaker 100 in FIG. 4, FIG. 11, etc. Hereinafter, the reinforcing member 10 (first member 11 and second member 12) of the diaphragm 5 may be referred to as a DP-ASSY (Diaphragm-Assembly) 50. Furthermore, the components that make up the magnetic circuit of the yoke 35, pole piece 36, outer plate 37, inner magnet 38, and outer magnet 39 may be referred to as an MC-ASSY (Magnetic-Circuit-Assembly) 51.

[0077] FIG. 17 is a schematic diagram showing a jig 55 for positioning the MC-ASSY 51. The jig 55 is provided with a positioning pin 56 and four positioning jigs 57 . As shown in FIG. 18, the frame 25 is positioned in accordance with the positioning pins 56 . 19 and 20, the MC-ASSY 51 is attached to four positioning jigs 57, and the MC-ASSY 51 is connected to the holding portion 32 of the frame 25. Note that FIG. 20 is a cross-sectional view taken along line BB in FIG. By using the jig 55, the MC-ASSY 51 can be positioned with high precision.

[0078] FIG. 21 is a schematic diagram showing a jig 58 for positioning the vibration suppression bobbin 28. As shown in FIG. The jig 58 is provided with four outer blocks 59, four inner blocks 60, and a positioning jig 61. The four outer blocks 59 and the four inner blocks 60 have the function of fixing the frame 25 . 22, the frame 25 to which the MC-ASSY 51 is attached is placed on a jig 58 so that the peripheral base portion 25a of the frame 25 is positioned between four outer blocks 59 and four inner blocks 60. The frame 25 is placed on the jig 58 upside down from the state shown in FIG. For example, two adjacent outer blocks 59a of the four outer blocks 59 are fixed as reference blocks, and the other two outer blocks 59b are configured to be movable relative to the jig 58. By employing such a configuration, it is possible to fix the frame 25 in a manner that is adequately adapted to the outer shape of the frame 25.

[0079] 23 and 24, the vibration suppression bobbin 28 is attached to the positioning jig 61. Then, the inner damper 29a is connected between the vibration suppression bobbin 28 and the central hole 33 of the frame 25. Note that FIG. 24 is a cross-sectional view taken along line CC in FIG. 23. By using the jig 58, it is possible to position the vibration suppression bobbin 28 with high precision, and it is also possible to attach the inner damper 29a with high precision.

[0080] FIG. 25 is a schematic diagram for explaining the positioning and height adjustment of the driving bobbin 26. As shown in FIG. As described with reference to FIG. 12 etc., drive bobbin 26, to which voice coil 40 is attached, is connected to first reinforcing portion 16 of diaphragm 5. The portion of drive bobbin 26 to which voice coil 40 is attached is inserted into the magnetic gap of actuator 27. Therefore, the MC-ASSY 51 that constitutes the magnetic circuit and the drive bobbin 26 are disposed in a spaced-apart state. In this embodiment, the positioning and height adjustment of the drive bobbin 26 relative to the MC-ASSY 51 are performed using a positioning shaft 63 and a height adjustment shaft 64 shown in FIG. 25 shows a cross section taken along a diameter passing through the center of the drive bobbin 26.

[0081] 25, the positioning shaft 63 is connected to the upper part of the height adjustment shaft 64. In this state, the drive bobbin 26 is placed on the height adjustment shaft 64. The voice coil 40 is attached to the drive bobbin 26 using the height adjustment shaft 64 as a reference. In the height adjustment shaft 64 illustrated in Fig. 25, the height of the position where the lower end of the drive bobbin 26 is placed and the height of the position where the lower end of the voice coil 40 abuts are appropriately designed. Therefore, by attaching the voice coil 40 using the height adjustment shaft 64 as a reference, it is possible to adjust the height of the voice coil 40 relative to the drive bobbin 26 to an appropriate position. The upper end of the drive bobbin 26 placed on the height adjustment shaft 64 is temporarily fixed to the positioning shaft 63 . After the upper end of the drive bobbin 26 and the positioning shaft 63 are temporarily fixed, the height adjustment shaft 64 is removed from the positioning shaft 63.

[0082] As shown in FIGS. 26 and 27, the height adjusting shaft 64 is removed, and the positioning shaft 63 with the drive bobbin 26 temporarily fixed thereto is placed on the MC-ASSY 51. This makes it possible to perform highly accurate positioning and height adjustment of the drive bobbin 26 relative to the MC-ASSY 51. Note that Fig. 27 is a cross-sectional view taken along line DD in Fig. 26 .

[0083] FIG. 28 is a schematic diagram showing a jig 65 for adjusting the height of the DP-ASSY 50. The jig 65 is provided with four shim rings 66 for adjusting the height. The DP-ASSY 50 is placed on the jig 65 so that the front side (the side connected to the surface layer member 9) of the DP-ASSY 50 faces. In addition, the DP-ASSY 50 is placed on the jig 65 so that the four first reinforcing portions 16 of the first member 11 are positioned on the four shim rings 66.

[0084] FIG. 29 is a cross-sectional view taken along line EE in FIG. 29, the height of the first member 11 is adjusted so that it is lower than the surface of the second member 12 that is connected to the surface layer member 9 by the thickness of the shim ring 66. By adjusting the first member 11 to a slightly lower position in this way, it becomes possible to sufficiently connect the surface layer member 9 to the second member 12. As shown in FIG. 30, the thickness of the shim ring 66, i.e., the offset amount of the height of the first member 11 relative to the second member 12, is set based on the size of the clearance C between the edge 30 and the surface member 9, for example. That is, the offset amount is calculated so that a predetermined clearance C is secured between the edge 30 (inner peripheral portion 30a) connected to the peripheral support portion 15 of the first member 11 and the surface layer member 9 connected to the second member 12. The clearance C is approximately 0.2 mm in size and is formed to suppress the effects of component tolerances. For example, if the clearance C is not provided, when attaching the surface layer member 9, the surface layer member 9 may be connected to the edge 20 before the second member 12. In this case, the second member 12 may not be sufficiently connected to the surface layer member 9, and the entire DP-ASSY 50 may move. By forming the clearance C, it becomes possible to sufficiently connect the surface layer member 9 to the second member 12, thereby improving the assembly precision of the speaker 100. The clearance C is filled with an adhesive or the like, and the edge 30 and the surface layer member 9 are sufficiently connected.

[0085] 31, the wiring board 46b is attached to the DP-ASSY 50. The wiring board 46b is attached to the back side of the second reinforcing portion 22 of the second member 11. Furthermore, wiring to the terminal board 46a is also performed. By determining the wiring length in advance, it is possible to improve workability.

[0086] The DP-ASSY 50 shown in FIG. 31 is placed from above on the frame 25 with the positioning shaft 63 attached as shown in FIG. A driving bobbin 26 is connected to the four first reinforcing portions 16 of the first member 11. A vibration suppression bobbin 28 is connected to the central support portion 18 of the second member 12. 32, the positioning shaft 63 is removed. The first reinforcing part 16 and the driving bobbin 26 are connected at an appropriate position and an appropriate height. The vibration suppression bobbin 28 is also connected to the second member 12 at an appropriate position and an appropriate height. As shown in FIG. 32, an edge 30 is connected to the frame 25 and the first member 11.

[0087] 33, the surface layer member 9 is placed from above, and the inner surface 9b of the surface layer member 9 is connected to the second member 12. Then, the inner surface 9b of the surface layer member 9 and the edge 30 are connected. In this case, the vibration damping member 14 is provided on the second reinforcing portion 22 of the second member 12, and then the surface layer member 9 is connected to the second member 12 and the vibration damping member 14. Without being limited to this, for example, the attachment of the edge 30 shown in Fig. 32 may be performed as a later process, and the connection between the surface layer member 9 and the second member 12 may be performed first. Then, the vibration damping member 14 may be inserted between the surface layer member 9 and the second reinforcing portion 22 and connected. 7 is formed on the inner surface 9b of the surface layer member 9. The surface layer member 9 is placed so that the pin member 45 is inserted into the through hole 47 formed in the first member 11.

[0088] As shown in FIG. 34, an outer damper 29b is connected between the vibration suppression bobbin 28 and the central hole 33 of the frame 25. Furthermore, four terminal boards 46a are connected to the frame 25. In this embodiment, the wiring board 46b and the terminal boards 46a are installed by screws, although this is not limitative. The wiring of the tinsel wire is performed, and the speaker 100 is manufactured. By using various jigs in this way, it is possible to improve the assembly accuracy and also to improve the overall distortion rate.

[0089] FIG. 35 is a graph showing frequency-sound pressure characteristics in the speaker 100 according to this embodiment. Compared to the frequency-sound pressure characteristics shown in Figure 3, it can be seen that the peak and dip in sound pressure is suppressed over a wide frequency band up to around 6 kHz. In other words, by using this technology, it is possible to increase not only the first-order but also higher-order resonance frequencies, and to achieve flat frequency-sound pressure characteristics over a wide frequency band.

[0090] As described above, in the speaker 100 according to this embodiment, the reinforcing member 10 is connected to the surface layer member 9. Then, first reinforcing portions 16 are configured near a plurality of driving points DP set on the surface layer member 9, and second reinforcing portions 22 are configured to connect the first reinforcing portions 16 together. Additionally, the second reinforcing portion 22 is connected to the first reinforcing portion 16 while being spaced apart from the surface layer member 9. This makes it possible to suppress the influence of natural vibrations, and to achieve high acoustic characteristics.

[0091] By applying this technology, it is possible to realize a reinforcement structure for speakers with a flat diaphragm that can obtain directivity close to that of a plane wave. In a flat diaphragm, split vibrations occur at relatively low frequencies, which often cause problems such as peaks and dips in the frequency characteristics of sound pressure and deterioration of directivity. This technology maintains the diaphragm surface on the sound-emitting side flat while providing a three-dimensional reinforcement structure on the rear side, making it possible to suppress the occurrence of split vibrations or reduce the adverse effects of split vibrations. In other words, it is possible to improve the peak and dip in the frequency characteristics of sound pressure, which are caused by split vibrations, as well as improve directionality and distortion.

[0092] <Other embodiments> The present technology is not limited to the above-described embodiments, and various other embodiments can be realized. In the above embodiment, the driving bobbin 26 functioning as a transmission member is connected to the first member 11 included in the reinforcing member 10. Of course, the present invention is not limited to this, and the driving bobbin 26 may be directly connected to the surface layer member 9. Even in this case, the reinforcing member 10 having the first reinforcing portion 16 and the second reinforcing portion 22 exhibits the effects described above. For example, the attachment of the edge 30 shown in Fig. 32 can be performed as a later process, and the connection between the surface layer member 9 and the second member 12 can be performed first. Then, the drive bobbin 26 can be connected to the surface layer member 9 from the inside of the drive bobbin 26 with an adhesive or the like. Of course, the process is not limited to this. Also, the first reinforcing portion 16 may be connected to the surface layer member 9. For example, the reinforcing member 10 may be produced without offsetting the height of the first member 11 relative to the second member 12 as illustrated in Fig. 29. Then, when attaching the surface layer member 9, the first member 11 may be attached to the surface layer member 9 together with the first member 12. Furthermore, the vibration suppression bobbin 28 may also be directly connected to the surface layer member 9 .

[0093] The surface layer member 9 may be a device having an image display function. For example, image display devices with flat display surfaces, such as liquid crystal panels and organic EL (Electro-Luminescence) panels, and image display devices using LEDs (Light Emitting Diodes) or LDs (Laser Diodes) can be used. These devices can be used to align the presentation positions of pictures and sounds, which is extremely useful when combining video content with sound. For example, they can provide better sound presentation (without split vibrations) than sound presentation using direct vibrations on the display. Furthermore, a device having an illumination function may be used as the surface layer member 9. Of course, a device having both an image display function and an illumination function may also be used.

[0094] FIG. 36 is a schematic diagram showing another variation of the diaphragm 5. In FIG. As shown in FIGS. 36A to 36C, the outer shape of the surface layer member 9 when viewed from the Z direction can be any shape, such as a circle, a triangle, or a hexagon. The reinforcing member 10 may be configured to have a plurality of first reinforcing portions 16 arranged in the vicinity of a plurality of driving points DP, and one or more second reinforcing portions 22 arranged to connect between the plurality of first reinforcing portions 22 while being spaced apart from the surface member 9. This technology can also be applied to cases where only one driving point DP is set on the inner surface 9b of the surface layer member 9. For example, a first reinforcing portion 16 may be configured near the driving point DP, and a second reinforcing portion 22 may be connected to the first reinforcing portion 22 while being spaced apart from the surface layer member 9.

[0095] FIG. 37 is a schematic diagram showing an example of an electronic device equipped with a speaker according to the present technology. For example, as shown in FIG. 37A, a speaker 100 according to the present technology can be mounted on a thin television device 70. The television device 70 is equipped with a control unit 71 that controls the driving of the speaker 100. The control unit 71 has hardware necessary for configuring a computer, such as a CPU, GPU, ROM, RAM, and HDD. For example, hardware such as an FPGA or ASIC may be used as the control unit 71. This allows the speaker 100 to be made thinner, which is very advantageous for making the television device 70 thinner. 37B, the speaker 100 according to the present technology can be mounted on headphones 75. The headphones 75 are equipped with a control unit 76 that controls the driving of the speaker 100. This allows the speaker 100 to be made thinner, which is very advantageous for making the headphones 75 thinner (smaller). There is no limitation on the type of electronic device that can incorporate the speaker 100 according to the present technology. For example, the present technology can be applied to any electronic device, such as a mobile phone, a smartphone, a personal computer, a game console, a digital camera, an audio device, a TV, a projector, a car navigation system, a GPS terminal, a wearable information device (glasses type, wristband type), or an IoT device connected to the Internet.

[0096] The configurations of the speaker, diaphragm, surface member, reinforcing member, frame, actuator, damper, electronic device, etc., as well as the manufacturing method of the speaker, etc., described with reference to the drawings are merely one embodiment, and can be arbitrarily modified without departing from the spirit of the present technology. In other words, any other configurations, manufacturing methods, etc., for implementing the present technology may be adopted.

[0097] In this disclosure, when the word "abbreviated" is used, this is used merely to facilitate understanding of the explanation, and there is no special meaning in whether or not the word "abbreviated" is used. That is, in the present disclosure, concepts that define shape, size, positional relationship, state, etc., such as "center," "central," "uniform," "equal," "same," "orthogonal," "parallel," "symmetrical," "extended," "axial direction," "cylindrical," "cylindrical," "ring-shaped," and "annular," are concepts that include "substantially center," "substantially central," "substantially uniform," "substantially equal," "substantially the same," "substantially orthogonal," "substantially parallel," "substantially symmetrical," "substantially extended," "substantially axial direction," "substantially cylindrical," "substantially cylindrical," "substantially ring-shaped," "substantially annular," and the like. For example, this also includes states that fall within a specified range (for example, a range of ±10%) based on criteria such as "perfectly centered," "perfectly central," "perfectly uniform," "perfectly equal," "perfectly the same," "perfectly perpendicular," "perfectly parallel," "perfectly symmetrical," "perfectly extended," "perfectly axial," "perfectly cylindrical," "perfectly cylindrical," "perfectly ring-shaped," and "perfectly annular." Therefore, even if the word "abbreviated" is not added, the concept expressed by adding "abbreviated" may be included. Conversely, a state expressed by adding "abbreviated" does not exclude a complete state.

[0098] In this disclosure, expressions using "than", such as "greater than A" and "smaller than A", are expressions that comprehensively include both concepts that include equivalent to A and concepts that do not include equivalent to A. For example, "greater than A" is not limited to cases that do not include equivalent to A, but also includes "A or greater." Furthermore, "smaller than A" is not limited to "less than A" but also includes "A or less." When implementing the present technology, specific settings and the like may be appropriately adopted from the concepts included in "greater than A" and "smaller than A" so as to achieve the effects described above.

[0099] It is also possible to combine at least two of the features of the present technology described above. That is, the various features described in each embodiment may be arbitrarily combined without distinction between the embodiments. Furthermore, the various effects described above are merely examples and are not limiting, and other effects may also be achieved.

[0100] The present technology can also be configured as follows. (1) a surface layer member having a first surface and a second surface opposite to the first surface, and a plurality of driving points serving as references for vibration transmission set at predetermined positions on the second surface; a reinforcing member having a plurality of first reinforcing parts formed in the vicinity of each of the plurality of driving points and one or more second reinforcing parts configured to connect between the plurality of first reinforcing parts while being spaced apart from the second surface, the reinforcing member being connected to the second surface of the surface member; A diaphragm having A speaker comprising: (2) The speaker according to (1), further comprising: an actuator that generates vibration; a plurality of transmission members that are arranged on the second surface side with respect to the plurality of driving points and transmit vibrations generated by the actuators to the diaphragm; Equipped with the first surface has a planar shape, Each of the plurality of transmission members transmits vibrations along a direction perpendicular to the first surface to the diaphragm. Speaker. (3) The speaker according to (2), The plurality of driving points are set at positions of nodes of natural vibrations occurring in the surface layer member. Speaker. (4) The speaker according to (2) or (3), The plurality of first reinforcing portions hold the plurality of transmission members. Speaker. (5) A speaker according to any one of (2) to (4), One or more natural vibration suppression points are set at predetermined positions on the second surface, The speaker further includes one or more natural vibration suppression units that are arranged on the second surface side with respect to the one or more natural vibration suppression points and are connected to the diaphragm. Speaker. (6) A speaker according to any one of (2) to (5), The one or more natural vibration suppressing portions are configured so that tension is not applied to the surface layer member along a direction perpendicular to the first surface. Speaker. (7) The speaker according to (5) or (6), The one or more second reinforcing portions are configured at positions facing the one or more natural vibration suppression points. Speaker. (8) A speaker according to any one of (5) to (7), The one or more natural vibration suppressing portions include a vibration damping member disposed between the second surface and the second reinforcing portion. Speaker. (9) A speaker according to any one of (5) to (8), The one or more natural vibration suppression points are set at the antinode positions of the natural vibrations generated in the surface layer members. Speaker. (10) The speaker according to (3) or (9), The natural vibration is at least one of a natural vibration of a (2,0)+(0,2) mode and a natural vibration of a (2,2) mode. Speaker. (11) A speaker according to any one of (1) to (10), The reinforcing member is formed by assembling a first member including the first reinforcing portion and a second member including the second reinforcing portion. Speaker. (12) A speaker according to any one of (5) to (11), the plurality of driving points are four driving points set symmetrically with respect to the center of the second surface, the plurality of first reinforcing portions are four first reinforcing portions configured to surround each of the four driving points; The one or more second reinforcing portions are four second reinforcing portions, including two second reinforcing portions extending in a first direction and two second reinforcing portions extending in a second direction perpendicular to the first direction. Speaker. (13) The speaker according to (12), The surface layer member has a rectangular shape when viewed from a direction perpendicular to the first surface, the rectangular shape having two sides whose main direction is the first direction and two sides whose main direction is the second direction. Speaker. (14) The speaker according to (12) or (13), The one or more natural vibration suppression points are set at the center of the second surface and at the center between two adjacent driving points among the four driving points. Speaker. (15) A speaker according to any one of (1) to (14), The surface layer member is made of a metal material, a material having a property of suppressing a high-order natural vibration mode, or a material having a high decorative property. Speaker. (16) A speaker according to any one of (1) to (15), The surface member has at least one of an image display function and an illumination function. Speaker. (17) The speaker according to any one of (1) to (16), further comprising: a substrate for driving the actuator mounted on the reinforcing member; Speaker. (18) A speaker according to any one of (1) to (17), the reinforcing member is formed by assembling a first member including the first reinforcing portion and a second member including the second reinforcing portion, The diaphragm has a shielding part connected to the peripheral edge of the surface member and the peripheral edge of the first member, and shields the inside of the speaker from the outside air. Speaker. (19) A speaker according to any one of (1) to (18), the first member has one or more through holes extending along a direction perpendicular to the first surface; The diaphragm has a pin member connected to the second surface of the surface member and disposed to pass through the one or more through holes of the first member. Speaker. (20) a surface layer member having a first surface and a second surface opposite to the first surface, and a plurality of driving points serving as references for vibration transmission set at predetermined positions on the second surface; a reinforcing member having a plurality of first reinforcing parts formed in the vicinity of each of the plurality of driving points and one or more second reinforcing parts configured to connect between the plurality of first reinforcing parts while being spaced apart from the second surface, the reinforcing member being connected to the second surface of the surface member; A diaphragm having a speaker having a control unit that controls driving of the speaker; An electronic device comprising: [Explanation of symbols]

[0101] DP...driving point SP…Vibration suppression point V1…Vibration 5...Vibration plate 6...Transmission member 7, 27...Actuator 9...Surface material 9a…radiating surface 9b…Internal surface 10...Reinforcing member 16...First reinforcement part 22...Second reinforcement 26...Drive bobbin 27...Actuator 28...Vibration suppression bobbin 29...Damper 30...Edge 45...Pin member 46... Circuit board 47...Through hole 70...TV equipment 75...Headphones 100...Speaker

Claims

1. a surface layer member having a first surface and a second surface opposite to the first surface, and a plurality of driving points serving as references for vibration transmission set at predetermined positions on the second surface; a reinforcing member having a plurality of first reinforcing parts formed in the vicinity of each of the plurality of driving points and one or more second reinforcing parts configured to connect between the plurality of first reinforcing parts while being spaced apart from the second surface, the reinforcing member being connected to the second surface of the surface member; a diaphragm having an actuator that generates vibration; a plurality of transmission members that are arranged on the second surface side with respect to the plurality of driving points and transmit vibrations generated by the actuators to the diaphragm; Equipped with the first surface has a planar shape, each of the plurality of transmission members transmits vibration along a direction perpendicular to the first surface to the diaphragm; the plurality of driving points are set at positions of nodes of natural vibrations occurring in the surface layer member, The natural vibration is at least one of a natural vibration in a (2,0)+(0,2) mode and a natural vibration in a (2,2) mode. Speaker.

2. 2. The speaker according to claim 1, The plurality of first reinforcing portions hold the plurality of transmission members. Speaker.

3. 2. The speaker according to claim 1, one or more natural vibration suppression points are set at predetermined positions on the second surface; The speaker further includes one or more natural vibration suppression units that are arranged on the second surface side with respect to the one or more natural vibration suppression points and are connected to the diaphragm. Speaker.

4. 4. The speaker according to claim 3, The one or more natural vibration suppressing portions are configured so that tension is not applied to the surface layer member along a direction perpendicular to the first surface. Speaker.

5. 4. The speaker according to claim 3, The one or more second reinforcing portions are configured at positions facing the one or more natural vibration suppression points. Speaker.

6. 4. The speaker according to claim 3, The one or more natural vibration suppressing portions include a vibration damping member disposed between the second surface and the second reinforcing portion. Speaker.

7. 4. The speaker according to claim 3, The one or more natural vibration suppression points are set at antinode positions of natural vibrations occurring in the surface layer members. Speaker.

8. 2. The speaker according to claim 1, The reinforcing member is formed by assembling a first member including the first reinforcing portion and a second member including the second reinforcing portion. Speaker.

9. 2. The speaker according to claim 1, the plurality of driving points are four driving points set symmetrically with respect to the center of the second surface, the plurality of first reinforcing portions are four first reinforcing portions configured to surround each of the four driving points; The one or more second reinforcing portions are four second reinforcing portions including two second reinforcing portions extending in a first direction and two second reinforcing portions extending in a second direction perpendicular to the first direction. Speaker.

10. 10. The speaker according to claim 9, The surface layer member has a rectangular shape when viewed from a direction perpendicular to the first surface, the rectangular shape having two sides whose main direction is the first direction and two sides whose main direction is the second direction. Speaker.

11. 10. The speaker according to claim 9, one or more natural vibration suppression points are set at predetermined positions on the second surface; the speaker further includes one or more natural vibration suppression units that are arranged on the second surface side with respect to the one or more natural vibration suppression points and are connected to the diaphragm; The one or more natural vibration suppression points are set at the center of the second surface and at the center between two adjacent driving points among the four driving points. Speaker.

12. 2. The speaker according to claim 1, The surface layer member is made of a metal material, a material having a property of suppressing a high-order natural vibration mode, or a material having a high decorative property. Speaker.

13. 2. The speaker according to claim 1, The surface member has at least one of an image display function and an illumination function. Speaker.

14. 2. The speaker according to claim 1, further comprising: a substrate for driving the actuator mounted on the reinforcing member; Speaker.

15. 2. The speaker according to claim 1, the reinforcing member is formed by assembling a first member including the first reinforcing portion and a second member including the second reinforcing portion, The diaphragm has shielding parts connected to the peripheral edge of the surface member and the peripheral edge of the first member, and shields the inside of the speaker from the outside air. Speaker.

16. 16. A loudspeaker according to claim 15, the first member has one or more through holes extending along a direction perpendicular to the first surface; The diaphragm has a pin member connected to the second surface of the surface member and disposed to pass through the one or more through holes of the first member. Speaker.

17. a surface layer member having a first surface and a second surface opposite to the first surface, and a plurality of driving points serving as references for vibration transmission set at predetermined positions on the second surface; a reinforcing member having a plurality of first reinforcing parts formed in the vicinity of each of the plurality of driving points and one or more second reinforcing parts configured to connect between the plurality of first reinforcing parts while being spaced apart from the second surface, the reinforcing member being connected to the second surface of the surface member; a diaphragm having an actuator that generates vibration; a plurality of transmission members that are arranged on the second surface side with respect to the plurality of driving points and transmit vibrations generated by the actuators to the diaphragm; a speaker having a control unit that controls driving of the speaker; Equipped with the first surface has a planar shape, each of the plurality of transmission members transmits vibration along a direction perpendicular to the first surface to the diaphragm; the plurality of driving points are set at positions of nodes of natural vibrations occurring in the surface layer member, The natural vibration is at least one of a natural vibration in a (2,0)+(0,2) mode and a natural vibration in a (2,2) mode. electronic equipment.

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