JP4821274B2 - Speaker system and speaker enclosure - Google Patents

Description

  The present invention relates to a speaker system and a speaker enclosure technology.

Various types of speaker systems have been developed, for example, those using bass reflex or drone cones.
The bass reflex enhances the bass using Helmholtz resonance, and the drone cone attaches a speaker unit without a drive circuit, and enhances the bass using resonance with the air in the volume of the enclosure.

  In bass reflex, when the volume of the enclosure is small, in order to lower the resonance frequency, the resonance tube must be made small and slender, the air resistance increases and the bass enhancement function is significantly reduced. There is a problem that wind noise such as a whistle is generated because the speed of the passing air becomes very high.

  In the case of a drone cone, in order to lower the resonance frequency, its mass must be increased. In order to reduce the resonance frequency, the compliance of the edge that supports the diaphragm must be large, but in order to support a diaphragm with a large mass, the spring property and strength of the edge must be large. It will be in conflict with. In addition, it is difficult for a heavy diaphragm to vibrate completely in parallel, and is likely to be accompanied by abnormal vibrations called rolling and rocking. This abnormal vibration increases distortion and consumes wasted energy, reducing efficiency.

For example, Patent Document 1 has been proposed in order to compensate for the above-described drawbacks of the drone cone. According to this method, rolling and rocking can be prevented, but because the structure supports the weight of the diaphragm (flap) with the edge provided around it, the edge needs strength, and its braking effect Therefore, there is a problem that the Q of vibration becomes small.
JP-T-2002-531036

  In order to solve the above problems, the present invention can output a sufficient bass component even in a small size, prevent rolling and rocking, and increase the vibration Q of the diaphragm, and a speaker. The object is to provide an enclosure.

  The speaker system according to the present invention can be vibrated elastically with a speaker enclosure sealed inside, a speaker attached to the speaker enclosure, and one end fixed on one surface of the speaker enclosure. A diaphragm composed entirely of a foam material, an opening provided at a position corresponding to a vibration part of the diaphragm on one surface provided with the diaphragm, and an edge of the diaphragm and the opening And a sealing member that closes the diaphragm in a state that enables vibration of the diaphragm and maintains the airtightness of the speaker enclosure.

In addition, the speaker system according to the present invention includes a speaker enclosure whose inside is sealed, a speaker attached to the speaker enclosure, and a plate-like member that can be elastically vibrated with one end fixed on one surface of the speaker enclosure. A vibration plate comprising a plurality of ribs extending from the one end of the surface of the plate-shaped member toward the vibration tip, and a position corresponding to a vibration part of the vibration plate on one surface provided with the vibration plate And the gap formed between the diaphragm and the edge of the opening is closed in a state in which the diaphragm can be vibrated to maintain the airtightness of the speaker enclosure. And a sealing member.
In a preferred aspect of the present invention, the height of the plurality of ribs protruding from the surface varies between the one end and the vibration tip.
In a further preferred aspect of the present invention, the diaphragm includes a skin material that covers the plurality of ribs.

  The speaker system according to the present invention can vibrate elastically with a speaker enclosure sealed inside, a speaker attached to the speaker enclosure, and one end fixed on one surface of the speaker enclosure. A diaphragm formed entirely or entirely of a honeycomb structure, an opening provided at a position corresponding to a vibration part of the diaphragm on one surface provided with the diaphragm, and the diaphragm and the opening And a sealing member that closes a gap formed between the edge portion and the diaphragm in a state in which the diaphragm is allowed to vibrate, and maintains the airtightness of the speaker enclosure.

  The speaker system according to the present invention can vibrate elastically with a speaker enclosure sealed inside, a speaker attached to the speaker enclosure, and one end fixed on one surface of the speaker enclosure. A diaphragm configured to have a thickness corresponding to the antinode of the next resonance thicker than other parts, and an opening provided at a position corresponding to the vibration part of the diaphragm on one surface provided with the diaphragm, A sealing member that closes a gap formed between the diaphragm and the edge of the opening in a state in which the diaphragm can be vibrated and maintains the airtightness of the speaker enclosure. Features.

  The speaker system according to the present invention includes a speaker enclosure sealed inside, a speaker attached to the speaker enclosure, and a diaphragm that can vibrate elastically with one end fixed on one surface of the speaker enclosure. A weight provided at a portion corresponding to an antinode of higher-order resonance of the diaphragm, an opening provided at a position corresponding to a vibration portion of the diaphragm on one surface provided with the diaphragm, and the diaphragm And a sealing member that closes a gap formed between the opening and the edge of the opening in a state in which the diaphragm can be vibrated and maintains the airtightness of the speaker enclosure. .

In a preferred aspect of the present invention, the surface on which the diaphragm and the opening are provided is the same surface as the surface on which the speaker is attached.
Moreover, in another preferable aspect of the present invention, the opening is formed on the one surface so as to be cut out leaving a part of the outline of the plane figure surrounded by a line, and a portion corresponding to the plane figure is formed. It functions as the diaphragm.

Further, the speaker enclosure according to the present invention is a sealed speaker enclosure having a speaker mounting hole to which a speaker is mounted, and can be vibrated elastically with one end fixed to one surface of the speaker enclosure. A diaphragm composed entirely of a foam material, an opening provided at a position corresponding to a vibration part of the diaphragm on one surface provided with the diaphragm, and an edge of the diaphragm and the opening And a sealing member that closes the diaphragm in a state that enables vibration of the diaphragm and maintains the airtightness of the speaker enclosure.
The speaker enclosure according to the present invention is a sealed speaker enclosure having a speaker mounting hole to which a speaker is mounted, and is configured by a plate-like member that can vibrate elastically with one end fixed on one surface of the speaker enclosure. A vibration plate having a plurality of ribs extending from the one end of the surface of the plate-shaped member toward the vibration tip, and provided on a surface corresponding to the vibration portion of the vibration plate on one surface provided with the vibration plate. A sealing member that closes a gap formed between the formed opening and the diaphragm and an edge of the opening in a state that enables vibration of the diaphragm, and maintains the airtightness of the speaker enclosure It is characterized by comprising.

Embodiments of the present invention will be described below with reference to the drawings.
<First Embodiment>
FIG. 1 is a perspective view showing an appearance of a speaker system according to a first embodiment of the present invention, and FIGS. 2A and 2B are a side sectional view and a side view showing the configuration of the embodiment, respectively. is there.
In FIG. 1, reference numeral 10 denotes a speaker having a voice coil, a magnet, and the like, and is attached to the front surface of the speaker enclosure 20. The speaker enclosure 20 is a rectangular parallelepiped hermetic enclosure, and all six surfaces are formed of plate-like members (for example, wood, synthetic resin, metal, or a synthetic material obtained by bonding them).

  As shown in FIG. 2A, a thin plate-like diaphragm 30 is attached to the baffle plate 20 a on the front surface of the speaker enclosure 20. The diaphragm 30 is formed in the same size as the front surface of the speaker enclosure 20 and covers the entire front surface of the speaker enclosure 20. A speaker mounting hole is provided through the diaphragm 30 and the baffle plate 20a, and the above-described speaker 10 is inserted into the speaker mounting hole. In this case, the front frame of the speaker 10 is fixed to the diaphragm 30 and the baffle plate 20a with screws.

  As shown in FIG. 2A, the baffle plate 20 a is formed only on the upper half of the front surface of the speaker enclosure 20. Further, the bottom surface 20c of the speaker enclosure 20 is formed to be slightly shorter than the upper surface 20d, and is a front end portion 20e extending upward so that the front side protrudes forward as shown in FIG.

Further, as shown in FIGS. 2A and 2B, the lower portion on the front side of the side surface 20f of the speaker enclosure 20 is inclined from the lower end of the baffle plate 20a to the front end portion 20e of the bottom surface 20c to form an inclined portion 20g. ing.
A space surrounded by the lower end of the baffle plate 20a described above, the upper edge of the inclined portion 20g and the front end portion 20e is an opening 20b. In the above configuration, the upper part of the vibration plate 30 is fixed to the baffle plate 20a, but the lower part of the vibration plate 30 is opposed to the opening 20b, so that it is a free end like a cantilever, It can be freely vibrated by the elasticity of the diaphragm 30. In the following, the lower part of the diaphragm 30 is referred to as a vibration part 30a.

In this case, the diaphragm 30 is formed of a foam material such as foamed vinyl chloride having both acoustically sufficient strength and elasticity. Here, “acoustically sufficient strength” means that the air does not pass through, has a density sufficiently higher than air, and has strength and elasticity to generate sound waves when vibrated. Moreover, the diaphragm 30 has the property of being able to block sound waves to some extent by itself.
In addition, the degree of “elasticity” is such that when one side of the diaphragm 30 is fixed and placed horizontally, its own weight is supported and can be kept substantially horizontal.

  The diaphragm 30 is provided with a plurality of ribs 301 protruding from the surface and extending from the support portion toward the vibration tip portion at a predetermined interval in the width direction. Since the diaphragm 30 is a flexible material, not only resonance in the primary vibration mode but also so-called “high-order resonance” that is resonance in the secondary or tertiary vibration mode occurs, and resonance in the primary vibration mode. Efficiency may be reduced. Since this higher order resonance is seen in the direction from the support portion of the diaphragm 30 toward the vibration tip portion, the rib 301 is provided from the support portion toward the vibration tip portion so as to increase the strength in this direction. . By providing the rib 301 on the diaphragm 30, the strength can be increased without increasing the mass of the diaphragm 30 so much, and higher-order resonance can be suppressed.

  Next, reference numeral 40 denotes an edge that is provided between the outer peripheral edge of the vibration portion 30 a of the diaphragm 30 and the edge of the opening 20 b and maintains the airtightness of the speaker enclosure 20. In this case, the edge 40 extends in the vertical direction between the side edge of the vibration part 30a and the inclined portion 20g so as to protrude and bend toward the internal space of the speaker enclosure 20 (hereinafter referred to as the bent portion 40a). Further, the edge 40 extends in the horizontal direction between the lower end edge of the vibration portion 30a and the front end portion 20e so as to protrude and bend toward the internal space of the speaker enclosure 20 (hereinafter referred to as a bent portion 40b).

  Here, FIG. 3 is a front view of the speaker enclosure 20 with the diaphragm 30 removed. A hatched portion in FIG. 3 is an edge 40, and portions protruding to the inner space side of the speaker enclosure 20 at the edge 40 are bent portions 40a and 40b. 4 is a bottom view of the speaker enclosure 20, and FIG. 5 is a cross-sectional view taken along line AA shown in FIG.

  The outer peripheral edge portion of the edge 40 shown in FIG. 3 is bonded to the outer peripheral edge portion of the vibration portion 30a of the diaphragm 30, and thereby the airtightness of the speaker enclosure 20 is maintained. Further, when the bent portions 40a and 40b of the edge 40 are freely bent, the vibration of the vibration portion 30a is not hindered and free vibration occurs. In addition, although the speaker terminal connected to the voice coil of the speaker 10 is provided in the back surface of the speaker enclosure 20, it is abbreviate | omitted in FIG. 2 (a), (b).

  In the configuration described above, when the speaker 10 is driven, the vibration of the cone paper of the speaker 10 is propagated to the air in the speaker enclosure 20, and the vibration portion 30a of the diaphragm 30 vibrates due to the vibration of the air. At this time, the diaphragm 30 that vibrates while being airtight at the edge 40 compresses or expands the air volume in the speaker enclosure 20 when vibrated. Therefore, a new resonance frequency is obtained between the compliance (mechanical flexibility) in which the air spring of the speaker enclosure 20 is added in addition to the elasticity of the diaphragm 30 and the equivalent mass of the diaphragm 30. As a result, a sound reproduced around the resonance frequency of the diaphragm 30 is generated.

  Here, the elasticity (spring property) of the air spring and the diaphragm 30 functions equivalently so that two springs are connected in parallel, but the air spring has less compliance than the spring of the diaphragm 30. Therefore, the resonance frequency of the diaphragm 30 as the speaker system is almost determined by the air compliance and the equivalent mass of the diaphragm 30.

  The resonance frequency determined as described above can be easily set to a desired value in the low frequency range. For example, when a speaker having an effective diameter of 8 cm, a minimum resonance frequency of 70 z, and Q = 0.35 is used as the speaker 10 and the internal capacity of the speaker enclosure 20 is 3.5 liters, the mass of the diaphragm 30 is 135 grams. The resonance frequency of the diaphragm can be 50 Hz.

  The vibration part 30a of the diaphragm 30 performs low-frequency sound reproduction in a primary vibration mode in which the whole part vibrates while being bent like a “round fan”. At this time, if the diaphragm 30 is made of a resin material or the like to secure the required hardness, the diaphragm may be too heavy and the resonance frequency may be too low. On the other hand, in the present embodiment, since the diaphragm 30 made of foam material is used, a diaphragm with a small specific gravity can be realized and the resonance frequency can be increased.

  In addition, due to the sound insulation of the foam material of the diaphragm 30, it is possible to reduce the middle and high sounds emitted from the speaker enclosure 20 through the diaphragm 30 to the outside.

  Further, when a flexible material is used for the diaphragm 30, not only resonance in the primary vibration mode but also high-order resonance occurs, and there is a problem that the efficiency of resonance in the primary vibration mode is lowered. If the diaphragm is thickened or changed to a hard material so as not to cause higher-order resonance, the mass of the diaphragm may increase and the resonance frequency may become too low.In contrast, in this embodiment, the diaphragm Since the plurality of ribs 301 are provided at 30, the strength can be increased without increasing the mass of the diaphragm so much, and higher-order resonance can be suppressed.

  Here, FIG. 6A shows the frequency characteristics of the speaker 10 in the case of the specific example described above, and FIG. 6B shows the frequency characteristics of the diaphragm 30. As is clear from this figure, when the above-described numerical values are set in the present embodiment, it is possible to output a strong bass with emphasis around 50 Hz. As described above, in the present embodiment, by using the bending vibration of the diaphragm 30, an action as a passive radiator such as a drone cone can be obtained.

  In the present embodiment, the diaphragm 30 has sufficient elasticity to support its own weight, so that the diaphragm 30 can be kept horizontal even when the diaphragm 30 is placed horizontally. The elasticity of the diaphragm 30 itself becomes a compliance of free resonance. However, since the internal loss of the elastic diaphragm 30 is much smaller than the internal loss of the edge 40 having the same elasticity, the loss during vibration is sufficient. small.

Further, the edge 40 in the present embodiment can be made of a softer material than the edge used in a conventional drone cone or the like, and does not require mechanical strength. In a conventional passive radiator such as a drone cone, a structure in which a rigid diaphragm is supported by an edge is required. Therefore, the edge has two functions of supporting the diaphragm and ensuring airtightness. However, in the present embodiment, the support function of the diaphragm 30 is given to the diaphragm 30 itself, and thus the edge 40 does not need a support function. Therefore, since it is sufficient for the edge 40 to be able to maintain the airtightness in the speaker enclosure 20, it is possible to use a soft material that has not been used in the past, and it is possible to create a situation in which the vibration of the diaphragm 30 is not hindered. Can be bigger.
Further, the resonance frequency of the diaphragm 30 can be lowered by increasing the mass of the diaphragm 30. In other words, the adjustment can be made according to the size and material of the diaphragm 30, and the adjustment can also be easily performed by attaching some member to the diaphragm 30.

Here, the difference between the present invention and the prior art will be described using an equivalent circuit. FIG. 7 is an electrical equivalent circuit of the speaker. A low-frequency resonance circuit (resonance frequency = F0) composed of Cmes, Res, and Lces is voltage-driven through a voice coil impedance.
here,
Re = voice coil DC resistance Le, L2, R2 = high-frequency impedance increasing element Cmes = equivalent mass capacity of speaker vibration system Lces = equivalent compliance inductance of speaker vibration system Res = mechanical braking resistance of speaker vibration system.

FIG. 8 is an equivalent circuit of the speaker enclosure, where Lve = equivalent volume inductance.
FIG. 9 is an equivalent circuit of a passive radiator such as a conventional drone cone or hinge fixing flap. As shown in the figure, the circuit configuration is such that the factor of the voice coil is eliminated from the speaker. The mass Cmep is supported by the compliance Lcep and braking resistance Rep of the edge.
here,
Cmep = Equivalent Mass Capacity of Passive Radiator Lcep = Equivalent Compliance Inductance of Passive Radiator Rep = Mechanical Braking Resistance of Passive Radiator FIG. 10 is an equivalent circuit of a conventional passive radiator system. The signal voltage drives the speaker and the sound output of the speaker drives the passive radiator through the speaker enclosure volume.

  The low-frequency resonance frequency as a system is approximately the resonance frequency of Cmep and Lve. In order to reduce the resonance frequency with a small volume, it is necessary to increase Cmep, which means that the passive radiator becomes heavy. To support a heavy passive radiator, a strong and strong edge is required. On the other hand, since the edge is required to be flexible, soft materials such as rubber and urethane are used, but it is necessary to increase the thickness in order to increase the strength. However, increasing the edge means decreasing the equivalent compliance Lcep and simultaneously increasing the braking force (when expressed in an electrical equivalent circuit, the resistance value Rep decreases). For this reason, the loss of the passive radiator is increased, and the reproduction capability of bass is lowered.

FIG. 11 is an equivalent circuit of the diaphragm according to the present invention. Since one side of the diaphragm is completely fixed, the diaphragm itself has a compliance Lceb and supports its own weight. Since the diaphragm is made of an elastic material, resistance components such as edge materials can be ignored. Since the edge does not need to support the dead weight of the diaphragm, it may be made of a thin material, and the compliance Lcex can be made very large, thereby inevitably reducing the loss (in terms of an electric equivalent circuit, the braking resistance Rex Becomes larger).
In FIG.
Cmeb = equivalent mass capacity of diaphragm Lceb = equivalent compliance inductance of diaphragm Lcex = equivalent compliance inductance of diaphragm edge Rex = mechanical braking resistance of diaphragm edge FIG. 12 is an equivalent circuit of the speaker system according to the present invention. Compared to FIG. 10, if the speaker and speaker enclosure volume are the same,
Cmep = Cmeb
If so, the low-band resonance frequency is the same. The same compliance is required to support this weight. However, since Lcep in FIG. 10 and Lcex >> Lceb in FIG. 12, it is almost Lceb, and if it is properly designed, almost Lcep = Lceb
It becomes. There is no significant difference in the factors so far. However, as is clear from the above description,
Rex >> Rep
This is an important feature of the present invention, and it can be seen that the loss is greatly reduced as compared with the conventional method, and bass reproduction is advantageous.

The shape of the rib is not limited to that described above, and may be a shape as shown in FIG. 13, for example. FIG. 13 is a perspective view showing an appearance of a speaker system according to a modification of the present embodiment. In this speaker system, as shown in the drawing, the height of the rib 302 is reduced as the vibration tip of the diaphragm 30 is approached.
When the diaphragm is provided with ribs to increase the strength of the diaphragm, higher-order resonance can be reduced, but the diaphragm may become too hard to bend and vibrate, but as shown in FIG. By configuring the rib 302 so that the height becomes lower as approaching the vibration tip of the diaphragm 30, it is possible to suppress higher-order resonance while maintaining the ease of bending vibration of the diaphragm 30. .
In this case, as shown in FIG. 13, the height of the rib 302 is lowered as it approaches the tip, but it is lowered as the center is highest and approaches the top or bottom, or the height corresponding to the vibration node is increased. You may comprise so that height may become high.

  Furthermore, as another example, for example, a shape as shown in FIG. 14 may be used. FIG. 14 is a perspective view showing an appearance of a speaker system according to a modification of the present embodiment. In this speaker system, as shown in the figure, a skin material 303 is provided so as to cover a plurality of ribs 301. Thus, by providing the skin material 303 so as to extend over the plurality of ribs 301, the strength of the diaphragm 30 can be further increased without increasing the mass of the diaphragm 30 so much.

Second Embodiment
Next, a second embodiment of the present invention will be described. FIG. 15 is a perspective view showing an appearance of the present embodiment. The configuration of this speaker system is different from that shown in the first embodiment described above in that the configuration of the diaphragm is different, and the other components are the same as those shown in the first embodiment. Therefore, in the following description, the same reference numerals are given to the same components as those in the first embodiment, and the description thereof is omitted as appropriate.
In FIG. 15, the vibration part of the diaphragm 31 has a two-layer structure in which a honeycomb-structure reinforcing material 31a is provided on the surface. Here, the honeycomb structure of the reinforcing material 31a is shown by cutting out a part of the diaphragm 31 shown in FIG. As described above, by reinforcing the diaphragm 31 with the honeycomb structure, the strength of the diaphragm 30 can be further increased without increasing the mass of the diaphragm 31 as in the first embodiment. Become. In the present embodiment, the two-layered diaphragm having the honeycomb structure reinforcing material 31a provided on the surface thereof is used. However, the present invention is not limited to this. For example, a part or all of the diaphragm 31 has a honeycomb structure. You may make it comprise.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. FIG. 16 is a perspective view showing the appearance of the present embodiment, and FIG. 17 is a side sectional view showing the configuration of the embodiment. The configuration of this speaker system is different from that shown in the first embodiment described above in that the configuration of the diaphragm is different. Therefore, in the following description, the same code | symbol is attached | subjected about the component similar to 1st Embodiment, and the description is abbreviate | omitted.
As shown in FIGS. 16 and 17, the diaphragm 32 of this speaker system is formed so that the thickness of the portion corresponding to the antinode of higher-order resonance is increased. Specifically, in the diaphragm 32, the thickness of the position of one half and one third from the fulcrum, which is likely to vibrate in the second and third vibration modes, is increased to increase the strength of the diaphragm in that portion. It is configured to suppress higher-order resonance and reduce the thickness of the other portions so that the entire mass of the diaphragm 32 is reduced.
By configuring the diaphragm in this manner, higher-order resonance of the diaphragm 32 can be suppressed without increasing the mass of the diaphragm 31 so much as in the first and second embodiments described above.

<Fourth embodiment>
Next explained is the fourth embodiment of the invention. FIG. 18 is a side sectional view showing the configuration of the present embodiment, and corresponds to FIG. 2A in the first embodiment described above. The configuration of this speaker system is different from that of the first embodiment described above in that the configuration of the diaphragm is different. The same components as those in the first embodiment are given the same reference numerals and the description thereof is omitted. Omitted.
The diaphragm 33 of this speaker system is provided with weights 331a and 331b at a portion corresponding to the antinode of higher-order resonance. Specifically, weights 331a and 331b are provided at positions one-half and one-third from the fulcrum where the diaphragm 33 is likely to vibrate in the second and third vibration modes.
By doing so, as in the first to third embodiments described above, higher-order resonance of the diaphragm 30 can be suppressed without significantly increasing the mass of the diaphragm 31.

<Modification>
As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, It can implement with another various form. An example is shown below.
(1) The configuration of the diaphragm is not limited to that shown in the above-described embodiment, and may be, for example, a shape as shown in FIG. FIG. 19 is a perspective view showing the appearance of the second embodiment of the present invention. Reference numeral 50 shown in FIG. 19 denotes a rectangular parallelepiped speaker enclosure, and the speaker 10 is attached to the upper part of the front baffle plate 50a. An opening 60 is provided that is elongated in a U shape from the center to the bottom of the baffle plate 50a.

  In this case, the U-shaped inner portion functions as the diaphragm 51. That is, since the upper part of the diaphragm 51 is integral with the baffle plate 50a and the other parts are separated from the baffle plate 50a by the U-shaped opening 60, the upper end of the diaphragm 51 is fixed. Can vibrate freely.

  The diaphragm 51 is provided with a plurality of ribs 511 extending in the vertical direction in the width direction, as in the first embodiment described above. By providing the rib 511, the strength can be increased without increasing the mass of the diaphragm 51 so much, and higher-order resonance can be suppressed.

  20A and 20B are a side sectional view and a transverse sectional view of the same embodiment, respectively. As shown in these drawings, the opening 60 is covered from the inside of the speaker enclosure 50 by an edge 70 having an arcuate cross section, whereby the airtightness of the speaker enclosure is maintained. FIG. 15 is a view showing the back surface of the baffle plate 50a, and the edge 70 covers the U-shaped opening 60 along its shape, as shown. Further, as shown in FIG. 20, the diaphragm 51 is formed thinner than the baffle plate 50 a outside the U-shaped opening 60.

  Since the diaphragm 51 of this modification has a fixed end that communicates with the baffle plate 50a, the diaphragm 51 itself has a support function. Therefore, the edge 70 does not need to support the weight of the diaphragm 51 and only has a function of maintaining airtightness. Therefore, it is possible to use a soft material, and it is possible to create an easy-to-move situation where vibrations of the diaphragm 51 are not suppressed. The operation of this embodiment is the same as that of the above-described embodiment, and the band near the resonance frequency of the diaphragm 51 (bass band) is enhanced.

In this modification, the opening is provided on the surface of the speaker enclosure where the speaker is provided to form the diaphragm. However, the position of forming the diaphragm (providing the opening) is limited to this. However, any position may be used as long as it is a wall surface of the speaker enclosure.
Further, as shown in each of the embodiments described above, the position of the opening is provided at a position corresponding to the vibration part of the diaphragm. In other words, it may be provided behind or around the diaphragm so as to enable vibration.

It is a figure which shows the external appearance of the speaker system which is 1st Embodiment of this invention. It is a figure which shows the internal structure of the embodiment. It is a front view which shows the state which removed the diaphragm in the same embodiment. It is a bottom view of the embodiment. FIG. 4 is a sectional view taken along line AA shown in FIG. 3. It is a graph which shows the frequency characteristic of the embodiment. It is an electric equivalent circuit of a speaker. It is an electrical equivalent circuit of a speaker enclosure. It is the equivalent circuit of the conventional passive radiator. It is an equivalent circuit of the conventional passive radiator system. It is an equivalent circuit of the diaphragm concerning this invention. It is an equivalent circuit of the speaker system concerning this invention. It is a figure which shows an example of the other structure of a diaphragm. It is a figure which shows an example of the other structure of a diaphragm. It is a perspective view which shows the external appearance of the 2nd Embodiment of this invention. It is a perspective view which shows the external appearance of the 3rd Embodiment of this invention. It is a sectional side view of the same embodiment. It is a sectional side view which shows the 4th Embodiment structure of this invention. It is a perspective view which shows other embodiment of this invention. It is a figure which shows the structure of the same embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Speaker system, 10 ... Speaker, 20, 50 ... Speaker enclosure, 30, 31, 32, 33, 51 ... Diaphragm, 40, 70 ... Edge, 60 ... Opening, 301, 302 ... Rib, 303 ... Skin material 331a, 331b ... weight.

Claims (11)

A speaker enclosure that is sealed inside;
A speaker attached to the speaker enclosure;
A vibration plate that is elastically vibrated in a state where one end is fixed on one surface of the speaker enclosure, and a vibration plate partly or entirely made of a foam material,
On one surface provided with the diaphragm, an opening provided at a position corresponding to a vibration part of the diaphragm;
A sealing member that closes a gap formed between the diaphragm and an edge of the opening in a state in which the diaphragm can be vibrated and maintains the airtightness of the speaker enclosure. A featured speaker system. A speaker enclosure that is sealed inside;
A speaker attached to the speaker enclosure;
A diaphragm comprising a plurality of ribs that are elastically vibrated with one end fixed on one surface of the speaker enclosure, and that extend from the one end of the surface of the plate-shaped member toward the vibration tip. When,
On one surface provided with the diaphragm, an opening provided at a position corresponding to a vibration part of the diaphragm;
A sealing member that closes a gap formed between the diaphragm and an edge of the opening in a state in which the diaphragm can be vibrated and maintains the airtightness of the speaker enclosure. A featured speaker system.   The speaker system according to claim 2, wherein a height of the plurality of ribs protruding from the surface changes between the one end and the vibration tip.   The speaker system according to claim 2, wherein the diaphragm includes a skin material that covers the plurality of ribs. A speaker enclosure that is sealed inside;
A speaker attached to the speaker enclosure;
A vibration plate that is elastically vibrated in a state where one end is fixed on one surface of the speaker enclosure, and a diaphragm part or all of which is formed in a honeycomb structure;
On one surface provided with the diaphragm, an opening provided at a position corresponding to a vibration part of the diaphragm;
A sealing member that closes a gap formed between the diaphragm and an edge of the opening in a state in which the diaphragm can be vibrated and maintains the airtightness of the speaker enclosure. A featured speaker system. A speaker enclosure that is sealed inside;
A speaker attached to the speaker enclosure;
A diaphragm configured to be elastically vibrated in a state where one end is fixed on one surface of the speaker enclosure, and a thickness of a portion corresponding to an antinode of the higher-order resonance is thicker than other portions;
On one surface provided with the diaphragm, an opening provided at a position corresponding to a vibration part of the diaphragm;
A sealing member that closes a gap formed between the diaphragm and an edge of the opening in a state in which the diaphragm can be vibrated and maintains the airtightness of the speaker enclosure. A featured speaker system. A speaker enclosure sealed inside;
A speaker attached to the speaker enclosure;
A diaphragm that can vibrate elastically with one end fixed on one surface of the speaker enclosure;
A weight provided at a portion corresponding to an antinode of higher-order resonance of the diaphragm;
On one surface provided with the diaphragm, an opening provided at a position corresponding to a vibration part of the diaphragm;
A sealing member that closes a gap formed between the diaphragm and an edge of the opening in a state in which the diaphragm can be vibrated and maintains the airtightness of the speaker enclosure. A featured speaker system.   The speaker system according to claim 1, wherein one surface on which the diaphragm and the opening are provided is the same surface as the surface on which the speaker is attached.   The opening is formed on the one surface so as to be cut out while leaving a part of an outline of a plane figure surrounded by a line, and a portion corresponding to the plane figure functions as the diaphragm. Item 9. The speaker system according to any one of Items 1 to 8. In a sealed speaker enclosure having a speaker mounting hole to which a speaker is mounted,
A vibration plate that can be vibrated by elasticity in a state where one end is fixed to one surface of the speaker enclosure, and a vibration plate partly or entirely made of a foam material,
On one surface provided with the diaphragm, an opening provided at a position corresponding to a vibration part of the diaphragm;
A sealing member that closes a gap formed between the diaphragm and an edge of the opening in a state in which the diaphragm can be vibrated and maintains the airtightness of the speaker enclosure. A featured speaker enclosure. In a sealed speaker enclosure having a speaker mounting hole to which a speaker is mounted,
A diaphragm comprising a plurality of ribs that are elastically vibrated with one end fixed on one surface of the speaker enclosure, and that extend from the one end of the surface of the plate-shaped member toward the vibration tip. When,
On one surface provided with the diaphragm, an opening provided at a position corresponding to a vibration part of the diaphragm;
A sealing member that closes a gap formed between the diaphragm and an edge of the opening in a state in which the diaphragm can be vibrated and maintains the airtightness of the speaker enclosure. A featured speaker enclosure.

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