JP4910372B2 - 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, a speaker system according to the present invention has a speaker enclosure sealed inside, a speaker attached to the speaker enclosure, and one end fixed like a cantilever on one surface of the speaker enclosure. A vibration plate that can vibrate elastically with the other end being a free end, and an opening provided at a position corresponding to a vibration part of the vibration plate on one surface provided with the vibration plate, An air gap formed between the diaphragm and the edge of the opening is closed in a state in which the vibration of the diaphragm is enabled, and a sealing member for maintaining the airtightness of the speaker enclosure is provided in the diaphragm. And a weight mounting means to which a predetermined weight can be mounted and whose mounting position is variable. The features.

In a preferred aspect of the present invention, the weight attaching means is a metal plate provided on the diaphragm, and the weight is a magnet.
In another preferable aspect of the present invention, the weight attaching means is a slide rail provided on the diaphragm, and the weight is attached to be slidable on the slide rail.
In another preferred aspect of the present invention, the weight attaching means is a plurality of screw holes provided in the diaphragm, and the weight is formed with screws that can be screwed into the screw holes. Features.

The speaker system according to the present invention, a speaker enclosure interior is sealed, and a speaker attached to the loudspeaker enclosure, within and one end is fixed Rutotomoni other end as a cantilever in one surface of the speaker enclosure A diaphragm that can vibrate elastically in a free end state, an opening provided at a position corresponding to a vibration part of the diaphragm, a weight member, and the vibration on one surface provided with the diaphragm A gap formed between the plate and the edge of the opening is closed in a state where the vibration of the diaphragm is enabled, the airtightness of the speaker enclosure is maintained, and the weight member is attached to the diaphragm. And a sealing member for fixing and fixing.

The speaker enclosure according to the invention, in a closed type speaker enclosure with a speaker mounting hole speaker is mounted within and one end is fixed Rutotomoni other end as Oite cantilevered on one side of the speaker enclosure A diaphragm that can vibrate elastically in a free end state, an opening provided at a position corresponding to a vibration part of the diaphragm on one surface provided with the diaphragm, the diaphragm and the opening the gap formed between the edge parts, closing while allowing vibration of the vibration plate, a sealing member for holding airtightness of the speaker enclosure, provided on the vibrating plate, a predetermined weight And a weight attaching means having a variable attachment position.

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 member 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. In order to satisfy such characteristics, the diaphragm 30 is made of, for example, a thin wooden board, a thin synthetic resin, a metal board, or a synthetic material obtained by bonding them together.

  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).

  Next, reference numeral 31 denotes a magnetic thin metal plate provided in the vibration part 30 a of the vibration plate 30. Reference numeral 32 denotes a magnet having a predetermined mass attached to the metal plate 31 as a weight. As shown in FIG. 1, the metal plate 31 is provided with a scale S indicating the resonance frequency of the vibration plate 30, and the resonance frequency of the vibration plate 30 is adjusted by adjusting the number of magnets 32 to be attached and their attachment positions. Can be adjusted.

  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.

  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.

  Moreover, the vibration part 30a performs low-pitched sound reproduction in a primary vibration mode that vibrates while being bent as a whole like a “round fan”. This is because the vibration plate 30 also has secondary, tertiary or higher vibration modes, but the entire vibration plate 30 is driven by air, so that the primary vibration mode is generated most strongly. This is because the mode generation level becomes small. Further, when it is desired to further suppress the higher-order mode, adjustment can be made by the material and thickness of the diaphragm 30 or by bonding a plurality of materials.

  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.

  In this embodiment, since the resonance frequency of the diaphragm 30 can be adjusted by the attachment position of the magnet 32, the speaker can be simply operated by attaching the magnet 32 to a desired position of the metal plate 31. It becomes possible to easily change the low frequency characteristics of the system.

Second Embodiment
Next, a second embodiment of the present invention will be described. FIG. 13A is a perspective view showing the appearance of the second embodiment of the present invention. This embodiment differs from the first embodiment described above in that instead of the metal plate 31 and the magnet 32, a rail 34 and a weight 35 (shown in FIG. 13A) are provided. Other components are the same as those shown in the first embodiment. Therefore, in the following description, the same code | symbol is provided about the component similar to 1st Embodiment, and the description is abbreviate | omitted suitably.
The rail 34 is attached to the vibration part 30a of the diaphragm 30 as illustrated. The rail 34 is made of a member such as soft resin that does not hinder the bending vibration of the diaphragm 30. FIG. 13B is a cross-sectional view of the rail 34. The weight 35 has a predetermined mass and is formed of a bolt with a washer. The tip of the weight 35 is screwed into the nut 36. By rotating the weight 35 and loosening the nut 36, the weight 35 can be moved on the rail 34. Conversely, the weight 35 is turned to tighten the nut 36. Thus, the weight 35 is fixed at an arbitrary position of the rail 34. By adjusting the position of the weight 35 on the rail 34 in this way, the equivalent mass of the diaphragm 30 changes, so that the resonance frequency can be adjusted.

  In this embodiment, since the resonance frequency of the diaphragm 30 can be adjusted by the position of the weight 35 on the rail 34, the user of this speaker system can perform a simple operation of moving the weight 35 on the rail 34. It is possible to easily change the low frequency specification of the speaker system simply by performing the above.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. FIG. 14A is a perspective view showing the appearance of the third embodiment of the present invention. This embodiment is different from the first embodiment described above in that a plurality of screw holes 37 (shown in FIG. 14A) are provided instead of the metal plate 31 and the magnet 32. Therefore, the same reference numerals are given to the same components as those in the first embodiment described above, and the description thereof is omitted as appropriate.
A plurality of screw holes 37 are attached to the vibration part 30a of the diaphragm 30 as shown in the figure. Reference numeral 38 denotes a screw which is attached to the screw hole 37. The resonance frequency of the diaphragm 30 can be adjusted by adjusting the position where the screw 38 is attached and the number of the screws 38. FIG. 14B is a cross-sectional view of the screw hole 37. As shown in FIG. 14B, since the screw hole 37 does not penetrate the diaphragm 30, the airtightness of the speaker enclosure 20 is not impaired.

  In this embodiment, since the resonance frequency of the diaphragm 30 can be adjusted by the position and number of the screw holes 37 in which the screws are attached, the user of this speaker system has the screws 38 provided at desired positions. It is possible to easily change the low-frequency characteristics of the speaker system only by performing a simple operation of attaching to the screw hole 37.

<Fourth embodiment>
Next, a fourth embodiment of the present invention will be described. FIG. 15 is a perspective view showing the external appearance of the fourth embodiment of the present invention. Reference numeral 50 shown in FIG. 15 denotes a rectangular parallelepiped speaker enclosure, and the speaker 10 is attached to an upper portion of a baffle plate 50a on the front surface. 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.

  FIGS. 16A and 16B 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. 17 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 in the figure.
As illustrated, the edge 70 is provided so as to cover the opening 60 and the lower portion of the diaphragm 51. An adhesive is attached to the hatched portion in FIG. 17, and the edge 70 is fixed to the vibration plate 51 and the baffle plate 51a with an adhesive. In the figure, 52 is a weight provided on the diaphragm 51 in order to adjust the resonance frequency. This weight 52 is fixedly fixed to the diaphragm 51 by an edge 70 as shown in the figure.

  Since the diaphragm 51 of the present embodiment 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 first embodiment described above, and the band near the resonance frequency of the diaphragm 51 (bass band) is enhanced.

In the conventional speaker system, when a weight is attached to adjust the resonance frequency of the diaphragm, an adhesive or the like for attaching the weight is separately required. In addition, there is a problem that the attached weight may come off due to the vibration operation of the diaphragm.
On the other hand, in the present embodiment, since the edge 70 having a shape that covers the diaphragm 51 in addition to the opening 60 is used, the weight 52 can be attached to the diaphragm 51 at the same time as the edge 70 is attached, which is simple. Weight can be attached in configuration. Further, the edge 70 covers the weight 52 and is adhesively fixed to the diaphragm 51, so that the weight 52 can be prevented from being detached from the diaphragm 51.

In the present embodiment, the opening 60 is covered by the edge 70 from the inside of the speaker enclosure 50, but it may be covered from the front side of the speaker enclosure 50 as shown in FIG. FIG. 18 is a cross-sectional view corresponding to FIG.
In the above-described embodiment, the diaphragm is formed by providing the opening on the surface of the speaker enclosure where the speaker is provided. 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.

<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) In the first embodiment described above, the magnet 32 is attached to the rectangular thin metal plate 31, and the number of the magnets 32 to be attached and the attachment position thereof are adjusted, whereby the resonance frequency of the diaphragm 30 is adjusted. I adjusted it. The shape of the metal plate 31 and the method of attaching the magnet 32 are not limited to this. For example, a metal plate and a magnet having a shape as shown in FIG. 19 may be used. In FIG. 19A, 31 </ b> A is a circular metal plate provided at the lower end of the vibration part 31 a of the vibration plate 31. As shown in FIG. 19B, magnets 32a, 32b, and 32c having different masses are attached to the metal plate 31A, and the resonance frequency of the diaphragm 31 can be adjusted by the attached magnets. It has become. In this case, as shown in FIG. 19 (b), a numerical value indicating the resonance frequency of the diaphragm 31 when each magnet is attached may be given to each magnet 32a, 32b, 32c. .
Moreover, it replaces with the magnets 32a-32c shown in FIG.19 (b), and as shown in FIG.19 (c), it is a metal plate so that the end surface of the several magnets 32d, 32d, 32d, 32d of the same mass may be piled up together. You may make it attach to 31A. In this case, the resonance frequency can be adjusted depending on the number of attachments.
Note that the metal plate 31A shown in FIG. 19A is approximately the same size as the magnets 32a to 32d, and is thin and small. Therefore, if such a metal plate is used, the mass of the diaphragm due to the addition of the metal plate The increase can be a small value.

(2) When the elongated opening is made as in the fourth embodiment described above, the shape is not limited to the U shape. In short, on a given surface of the speaker enclosure, a plane figure surrounded by a line is assumed, and it may be formed so as to be cut out while leaving a part of its outline. By forming in this way, the part corresponding to the said plane figure functions as a diaphragm.

(3) Moreover, as shown by each embodiment mentioned above, the position of an opening part is provided in the position corresponding to the vibration site | part of a 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 the external appearance of the speaker system which is 2nd Embodiment of this invention. It is a figure which shows the external appearance of the speaker system which is 3rd Embodiment of this invention. It is a figure which shows the external appearance of the speaker system which is 4th Embodiment of this invention. It is a figure which shows the internal structure of the embodiment. It is a figure which shows the back surface of the baffle board 50a of the embodiment. It is a cross-sectional view concerning the modification of the embodiment. It is a figure which shows the external appearance of the speaker system which concerns on the modification of the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Speaker, 20, 50 ... Speaker enclosure, 30, 51 ... Diaphragm, 31 ... Metal plate, 32 ... Magnet, 34 ... Rail, 35, 52 ... Weight, 37 ... Screw hole, 38 ... Screw, 40, 70 ... Edge, 60 ... opening.

Claims (6)

A speaker enclosure that is sealed inside;
A speaker attached to the speaker enclosure;
A diaphragm which can vibrate the elastic in a state Rutotomoni other end is fixed at one end as a cantilever in one surface of the speaker enclosure has a free end,
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 vibration of the diaphragm is enabled, and maintains the airtightness of the speaker enclosure;
A speaker system comprising weight attaching means provided on the diaphragm, to which a predetermined weight can be attached, and the attachment position of which is variable.   The speaker system according to claim 1, wherein the weight attaching means is a metal plate provided on the diaphragm, and the weight is a magnet.   The speaker system according to claim 1, wherein the weight attaching unit is a slide rail provided on the diaphragm, and the weight is attached to be slidable on the slide rail.   2. The speaker according to claim 1, wherein the weight attaching means is a plurality of screw holes provided in the diaphragm, and screws that can be screwed into the respective screw holes are formed in the weight. 3. system. A speaker enclosure that is sealed inside;
A speaker attached to the speaker enclosure;
A diaphragm which can vibrate the elastic in a state Rutotomoni other end is fixed at one end as a cantilever in one surface of the speaker enclosure has a free end,
On one surface provided with the diaphragm, an opening provided at a position corresponding to a vibration part of the diaphragm;
A weight member;
A gap formed between the diaphragm and the edge of the opening is closed in a state in which the diaphragm can be vibrated, the airtightness of the speaker enclosure is maintained, and the weight member is oscillated. A speaker system comprising: a sealing member fixed to a plate. In a sealed speaker enclosure having a speaker mounting hole to which a speaker is mounted,
A diaphragm which can vibrate the elastic in a state where Rutotomoni other end one end as Oite cantilever is fixed to one surface of the speaker enclosure has a free end,
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 vibration of the diaphragm is enabled, and maintains the airtightness of the speaker enclosure ;
A speaker enclosure comprising weight attaching means provided on the diaphragm, to which a predetermined weight can be attached, and the attachment position of which is variable.

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