JPH11155186A - Loudspeaker system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the low frequency characteristic and transient characteristic of a loud speaker system, while making the speaker system small and lightweight by introducing a simple modification to a mounting structure of a speaker unit on a baffle plate of an enclosure. SOLUTION: A plurality of tubular spacers 15 are interposed between a front face of a baffle board 11 and an inner 1, face of a flange 14 at an outer circumferential part of a speaker unit wherein a speaker unit 13 is fitted on the baffle board 11 with machine screws 16 as a mounting jig inserted to the spacers 15, and a gap acting as a prescribed vent communicating the inside and the outside of an enclosure 10 is formed between the rear side of the flange 14 of the speaker unit 13 and a front face of the baffle board 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker system, and more particularly, to a technique for improving sound quality.

[0002]

2. Description of the Related Art In a conventional loudspeaker system, generally, importance is placed on the hermeticity of an enclosure. this is,
This is because sound pressure leakage from the enclosure adversely affects the frequency characteristics. That is, the sound wave leaking from the enclosure interferes with the direct sound from the speaker system and disturbs the frequency characteristics. In particular, as the sound wave leaks from a portion farther from the speaker unit, the phase of the sound pressure in the enclosure is more likely to be uniform and sharper. Causes interference.

[0003] Therefore, it is an iron rule that a typical speaker unit is mounted on a baffle of an enclosure by keeping airtightness of its mounting surface, and this mounting method is treated in a textbook. For example, FIG.
As shown in FIG. 2B, the speaker unit 1 is attached with the inner surface of the flange 2 at the outer periphery thereof and the front surface of the baffle plate 4 of the enclosure 3 closely attached to each other, or the speaker unit 1 is attached to the outer surface of the flange 2. Baffle plate 4
The rear surface is attached closely.

[0004]

Generally, the low-frequency characteristics of a speaker system are limited to the lowest resonance frequency of the unit, and if the enclosure in which it is installed has sufficient capacity, the lowest resonance frequency of the unit is reduced. Although it is a condition for reproduction, in the conventional speaker system that emphasizes the tightness of the enclosure, the low frequency characteristics and transient of the speaker system are affected by the influence of the inertial vibration of the air spring inside the enclosure on the diaphragm. The characteristics are adversely affected, and particularly when the mounting capacity is smaller than the enclosure capacity required by the speaker unit, the attenuation of the low-frequency characteristics becomes remarkable.

A loudspeaker unit having a large-diameter diaphragm is suitable for low-frequency reproduction. However, the use of the large-diameter diaphragm causes an increase in the capacity of the enclosure, and inevitably increases the size of the speaker system. For this reason, speaker systems that attempt to reproduce the low-frequency range are generally large and heavy, expensive, and inferior in handling.

In order to solve such problems and reduce the size of the system, a bass reflex, a resonance room, and an acoustic tube are used.
A system with a load, a closed system with a sound absorbing material inside, a correction with output detection such as motional feedback, and a system with an electronic circuit such as an equalizer have been proposed, but all have complicated structures. And production costs are inevitable. Also, in these cases, there were unique sound quality trends that were unique to the system.
Conventionally, as a cabinet (enclosure) of a speaker system, as shown in FIG. 15, a speaker unit 5 is attached to an auxiliary baffle plate 6, and this is spaced from a baffle plate 8 on the front of the cabinet (enclosure) 7. An attached type RJ cabinet is known. However, in this R-J type cabinet, a ventilation path communicating between inside and outside of the cabinet 7 is provided.
The baffle plate 8 is open at both ends of the opening 9, and although the bass characteristics are improved, the output sound pressure level in the middle range is lowered and the peak appears near the bass reproduction limit frequency. There is.

[0007] Conventionally, a partition plate is opposed to a diaphragm behind a diaphragm at a predetermined distance from the diaphragm, and an inner peripheral side of an acoustic space formed by the partition plate and the diaphragm is formed in a speaker box. It has been proposed to communicate with a space and open the outer peripheral side to the front side of the speaker box via a vent hole ring (see Japanese Patent Application Laid-Open No. 2-195796).

In this device, the space formed by the partition plate and the diaphragm communicates with the space in the speaker box on the inner peripheral side and is open to the front of the speaker box on the outer peripheral side. Function as a duct for effectively guiding the bass reproduction output of the speaker, and the bass can be enhanced.

However, according to this technique, a speaker plate is formed by integrally attaching a partition plate and a vent hole ring to a diaphragm, that is, a cone, thereby forming a space as described above. Therefore, the speaker unit itself must have a special specification, and cannot be easily applied to an existing speaker system. Further, the structure of the cone is complicated, the weight is increased, and the cost is disadvantageous. Furthermore, since the above-mentioned space has a bent configuration, the air in the enclosure is not released smoothly, and the influence of the inertial vibration of the air spring in the enclosure on the diaphragm is effectively prevented. Not what you get.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. In a speaker system, the speaker system can be reduced in size and weight by a simple improvement of a structure for mounting a speaker unit enclosure to a baffle plate. It is an object of the present invention to improve low frequency characteristics and transient characteristics of a loudspeaker system while improving the performance.

[0011]

According to a first aspect of the present invention, there is provided a speaker system including an enclosure and a speaker unit attached to an opening of a baffle plate on a front surface of the enclosure. In the system, a predetermined ventilation path formed along substantially the entire inner circumference of the opening of the baffle plate and communicating with the inside and outside of the enclosure is provided at an outer peripheral portion of the speaker unit.

According to a second aspect of the present invention, the speaker unit is attached to the baffle plate such that a gap serving as the ventilation path is formed between the rear surface of the outer peripheral portion and the front surface of the baffle plate. Features.

[0013] The invention according to claim 3 is that the speaker unit is attached to the baffle plate such that a gap serving as the ventilation path is formed between the front surface of the outer peripheral portion and the rear surface of the baffle plate. Features.

According to a fourth aspect of the present invention, in the gap, a plurality of spacers are interposed between the inner surface of the outer periphery of the speaker unit and the front surface of the baffle plate or between the outer surface of the outer periphery of the speaker unit and the rear surface of the baffle plate. It is characterized by being formed by

According to a fifth aspect of the present invention, the spacer is formed by a substantially tubular member, and a fixture penetrating the substantially tubular member is fixed to an outer peripheral portion of the speaker unit and the baffle plate. It is characterized by.

The invention according to claim 6 is characterized in that the spacer is formed of a material having a predetermined vibration absorption rate.

The invention according to claim 7 is that the spacer is
It is characterized by being integrally molded with a speaker unit or a baffle plate.

According to an eighth aspect of the present invention, the gap portion is located on the outer peripheral portion of the speaker unit, a plurality of spacer portions projecting rearward from the rear surface of the outer peripheral portion, and at a position rearward from the rear surface of the outer peripheral portion of the speaker unit. And a ring-shaped rib for connecting the respective spacers to each other, and the rib is attached to the front surface of the baffle plate.

According to a ninth aspect of the present invention, the gap portion is located on the outer peripheral portion of the speaker unit, a plurality of spacer portions protruding forward from the front surface of the outer peripheral portion, and at a position forward from the front surface of the outer peripheral portion of the speaker unit. And a ring-shaped rib portion connecting the respective spacers to each other, and integrally forming the rib portion on the rear surface of the baffle plate.

According to a tenth aspect of the present invention, the gap portion is
A plurality of ribs constituting a spacer are integrally formed around the opening of the baffle plate to form a groove on the inner peripheral surface of the rib, and a plurality of mounting pieces protruding outward on the outer peripheral part of the speaker unit. While turning the speaker unit,
It is characterized by being formed by fitting the mounting piece into the groove of the rib.

According to an eleventh aspect of the present invention, the gap portion is
The upper wall and the lower wall of the enclosure are respectively extended forward, and the upper and lower ends of a pair of left and right support members arranged on the front surface of the baffle plate are respectively connected to the extended portions. The speaker unit is characterized in that the speaker unit is formed by attaching an outer peripheral portion of the speaker unit away from the baffle plate.

According to a twelfth aspect of the present invention, a mounting piece having a plurality of openings serving as the air passage is formed integrally with an outer peripheral portion of the speaker unit, and the mounting piece is formed on an outer surface or an inner surface of the baffle plate. It is characterized by being attached.

According to a thirteenth aspect of the present invention, a mounting piece protruding from the inner peripheral surface of the opening of the baffle plate is formed, while a mounting piece protruding from the outer peripheral surface of the speaker unit is formed.
The mounting piece is attached to the mounting piece, and a gap serving as the ventilation path is formed between the inner peripheral surface of the opening and the outer peripheral portion of the speaker unit.

The invention according to claim 14 is characterized in that the enclosure has a bass reflex port or a bass radiating hole for a bass reflex.

The operation of the present invention will be described. In the present invention, a predetermined ventilation path communicating between inside and outside of the enclosure functions as a sound hole, and a bass reflex operation emits a resonance sound inside the enclosure to enhance a bass range. In addition, the influence on the diaphragm due to the inertial vibration of the air spring inside the enclosure is reduced,
The transient characteristics over the entire reproduction band are improved, and a sound quality that is smooth and has no heaviness can be obtained.

Further, since the ventilation path is formed in the outer peripheral portion of the speaker unit along substantially the entire inner periphery of the opening of the baffle plate, air uniformly flows in and out from the outer peripheral portion of the speaker unit. Because the unit cone paper curves smoothly toward the ventilation path,
The resistance received by the cone paper due to the air pressure change inside the enclosure is effectively reduced, and the sound quality can be more effectively improved.

In particular, since the air passage is formed at a position close to the speaker unit, it is possible to enhance the low-frequency characteristics and prevent the characteristics from being disturbed at other frequencies. In particular, as in the invention according to claims 4 to 10, a plurality of gaps serving as ventilation paths are provided between the inner surface of the speaker unit outer peripheral portion and the front surface of the baffle plate or between the outer surface of the speaker unit outer peripheral portion and the back surface of the baffle plate. When the spacer is formed by interposing the spacer, the spacer transmits the vibration of the speaker unit frame to the baffle plate, acts as if it were a contrabass bridge (bridge), and vibrates the enclosure to increase resonance. Let it.

According to the design intention, if the spacer is made of a material such as rubber or the like having a high vibration absorption coefficient or a material such as a metal having a small vibration absorption, the resonance of the baffle plate can be reduced. It is also possible to control.

According to the fourteenth aspect of the present invention, in a device provided with a bass reflex port by a bass reflex duct or a device provided with a bass sound radiating hole for a bass reflex, the resonance frequency of the bass reflex port and the bass radiating hole is set as low as possible. Thus, the lowest range can be obtained.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the attached drawings. First, the basic concept of the present invention will be described. The problem of downsizing of the speaker system and the accompanying deterioration of the low-frequency characteristics can be solved by separating the diaphragm of the speaker unit from the influence of braking by the air spring inside the enclosure.

For example, musical instruments such as guitars and contrabass have good bass sound by the action of the resonance box, despite having only a very small surface area diaphragm such as a string. Also, harmonics that are harmonic components are extremely rich. This is because the vibration of the string, which is the vibration element, is transmitted to the resonance box through the bridge, and the resonance of the body is maximally used.

As is apparent from this example, the simplest and most efficient reproduction of bass sound by a speaker system is to use an enclosure as a resonance box. Therefore, in the present invention, by providing a predetermined ventilation path formed along substantially the entire inner circumference of the opening of the baffle plate and communicating with the inside and outside of the enclosure, for example, the speaker unit is provided at the outer periphery of the speaker unit. The diaphragm is received by the air spring inside the enclosure by installing it at a position away from the opening to the extent that the low frequency characteristics do not deteriorate due to low frequency sound without making close contact with the opening surface of the baffle plate of the enclosure The basic concept is to avoid the influence and use the enclosure efficiently as a resonance box.

Next, an embodiment of a speaker system based on the basic concept of the present invention will be described. FIG. 1 is a longitudinal sectional view of the speaker system according to the first embodiment. In this figure, the speaker system is an enclosure 10
A speaker unit 13 attached to the opening 12 of the baffle plate 11 on the front of the enclosure 10;
It is comprised including.

The speaker unit 13 is formed such that a gap is formed between the rear surface of the flange portion 14 on the outer periphery thereof and the front surface of the baffle plate 11 so as to form a predetermined ventilation path communicating the inside and outside of the enclosure 10. It is attached to the baffle plate 11. In this embodiment, a plurality of tubular spacers 15 are interposed between the inner surface of the flange portion 14 on the outer peripheral portion of the speaker unit 13 and the front surface of the baffle plate 11, and screws 16 as mounting tools inserted through the spacers 15 are used. The speaker unit 13 to the baffle plate 11
It is designed to be attached to.

In this case, eight screw insertion holes are provided at equal intervals around the outer periphery of the flange portion 14 of the speaker unit 13 and around the opening of the baffle plate 11, and as shown in FIG. Insertion hole, spacer 15
And the nut 17 is fitted into the end of the threaded end of the screw 16 projecting from the back surface of the baffle plate 11 and tightened. The spacer 15
Examples thereof include those made of a hard member such as a metal (vibration transmission type), those made of an elastic member such as a rubber material and a coil spring (vibration absorption type), and the like.

In the case of the vibration absorbing type spacer 15, it is preferable to interpose a washer made of an elastic member such as a rubber material between the nut 17 and the baffle plate 11.

FIG. 2 is a longitudinal sectional view of the speaker system according to the second embodiment. In this embodiment, the speaker unit 13 is mounted such that a gap of a predetermined distance is formed between the front surface of the flange portion 14 and the rear surface of the baffle plate 11. In this embodiment, a plurality of tubular spacers 15 are interposed between the front surface of the flange portion 14 of the speaker unit 13 and the rear surface of the baffle plate 11, and screws 16 inserted into the spacers 15 are used.
The speaker unit 13 is attached to the baffle plate 11.

The spacer 15 is provided in the speaker unit 1.
3 or the baffle plate 11 may be integrally formed. For example, as shown in FIG. 4, a spacer portion 15A is integrally formed on the baffle plate 11 in advance, and the spacer portion 15A is formed.
The flange section 14 of the speaker unit 13 may be attached to A. For this attachment, a rivet 15B or a split pin may be used as shown in FIG. Or,
A pin and a C-ring fitted into the pin may be used.

As shown in FIG. 5, a recess 11A is formed around the opening 12 on the outer surface of the baffle plate 11, and inside the recess 11A, the flange 14 and the spacer 1A are formed.
When the baffle plate 11 is fastened to the baffle plate 11, the speaker unit 13 does not protrude from the front surface of the baffle plate 11, and the shape of the speaker system 10 becomes smart.

FIGS. 6A and 6B are perspective views of the speaker units of the speaker systems of the third and fourth embodiments. The embodiment of FIG.
A plurality of spacer portions 18 projecting rearward from the rear surface of the flange portion 14 and a ring-shaped rib portion 19 located at a position rearward from the rear surface of the flange portion 14 and connecting the spacer portions 18 to each other. Are integrally formed, and the rib portion 19 is attached to the front surface of the baffle plate using screws and nuts.

In the embodiment shown in FIG. 2B, a plurality of spacers 20 projecting forward from the front surface of the flange unit 14 and the flange unit 1 are provided on the flange unit 14 of the speaker unit 13.
And a ring-shaped rib portion 21 for connecting the spacer portions 20 to each other at a position forward from the front surface, and integrally forming the rib portion 21 with the rear surface of the baffle plate using screws and nuts. Things.

FIG. 7 is a perspective view of a speaker unit in the speaker system according to the fifth embodiment. In this embodiment, a plurality of ribs 22 constituting a spacer are integrally formed around the opening 12 of the baffle plate 11 and the ribs 22 are formed.
While a groove 22A is formed on the inner peripheral surface of the speaker unit 13, a plurality of mounting pieces 23 projecting outward from the flange 14 of the speaker unit 13 are formed.
The attachment piece 23 is fitted into the groove 22A of the rib 22.

FIG. 8 is a perspective view of a speaker unit in the speaker system according to the sixth embodiment. In this embodiment, the upper wall portion and the lower wall portion of the enclosure 10 are respectively extended forward, and the upper and lower ends of a pair of left and right support members 24 arranged on the front surface of the baffle plate 11 are connected to the extended portions, respectively. The flange portion 14 of the speaker unit 13 is attached to the pair of support members 24. When the flange portion 14 of the speaker unit 13 is separated from the baffle plate 11, the flange portion 14 of the speaker unit 13 and the opening are formed. 12, a gap portion serving as an air passage is formed.

FIG. 9 is a perspective view of a speaker unit in the speaker system according to the seventh embodiment. In this embodiment, a mounting piece 25 in which a plurality of openings 25A are formed is integrally formed with a flange portion 14 of a speaker unit 13 so that the mounting piece 25 is mounted on an outer surface or an inner surface of a baffle plate. It was done. In this case, a vent formed of the opening 25A is formed on the outer periphery of the speaker unit 13.

FIG. 10 is a perspective view of a speaker unit in the speaker system according to the eighth embodiment. In this embodiment, the mounting piece 26 protrudes from the inner peripheral surface of the opening 12 of the baffle plate 11 while the speaker unit 1
The mounting piece 27 is also formed on the outer peripheral surface of the mounting piece 3, and the mounting piece 27 is mounted on the mounting piece 26 with screws 28 or the like. In this embodiment, a gap portion serving as an air passage is formed between the inner peripheral surface of the opening 12 and the outer peripheral portion of the speaker unit 13.

According to the speaker system having such a configuration,
By providing a predetermined ventilation path formed along the substantially entire inner periphery of the opening of the baffle plate and communicating with the inside and outside of the enclosure at the outer periphery of the speaker unit, the following operations and effects are achieved. That is, in the enclosure
The predetermined ventilation path communicating with the outside functions as a sound hole, and emits a resonance sound inside the enclosure by a bass reflex operation to enhance a bass range.

Further, the influence of the inertial vibration of the air spring inside the enclosure on the diaphragm is reduced, the transient characteristics over the entire reproduction band are improved, and a sound quality that is stretchable and has no heavy weight can be obtained. Further, since the ventilation path is formed in the outer periphery of the speaker unit along substantially the entire inner periphery of the opening of the baffle plate, air uniformly enters and exits from the outer periphery of the speaker unit, and the cone of the speaker unit is formed. Because the curve of the paper is gradually formed toward the ventilation path, the air pressure inside the enclosure changes,
The resistance of the cone paper is effectively reduced, and the sound quality can be more effectively improved.

In particular, since the air passage is formed at a position close to the speaker unit along substantially the entire inner periphery of the opening of the baffle plate, the bass frequency characteristics are enhanced,
Disturbance in characteristics at other frequencies can be prevented. Incidentally, when the air passage is far away from the speaker unit, as described in the related art, although the bass frequency characteristics can be enhanced, there is a disadvantage that the characteristics are disturbed at other frequencies.

Therefore, even when the mounting volume is smaller than the enclosure volume required by the speaker unit, it is possible to suppress the attenuation of the low-frequency characteristic, and to use a small-sized enclosure having a large-diameter vibration capable of high efficiency and high input resistance. A speaker unit having a plate can be used, and the efficiency and size of the speaker system can be improved at the same time.

In particular, a gap serving as a ventilation path is formed by interposing a plurality of spacers between the inner surface of the speaker unit outer peripheral portion and the front surface of the baffle plate or between the outer surface of the speaker unit outer peripheral portion and the back surface of the baffle plate. The embodiment has the following advantages. That is, the spacer transmits the vibration of the frame of the speaker unit to the baffle plate,
It acts as a bridge of a contrabass and vibrates the enclosure to increase the resonance described above.

If the spacer is made of a material having a large vibration absorption such as a resin such as rubber, or a material such as a small metal such as metal, the resonance of the baffle plate can be controlled according to the design intention.

Further, since ventilation holes can be formed in the outer periphery of the speaker unit by simple improvements such as adding a spacer, changing the shape of the opening of the baffle plate, changing the shape of the outer periphery of the speaker unit, etc. It is not necessary to use a specific specification, it can be easily applied to an existing speaker system, and the structure of the speaker unit does not become complicated, the weight does not increase, and the cost is advantageous.

Also, as shown in FIG.
9 or a bass reflex hole (not shown) for the bass reflex, the lowest frequency range can be obtained by setting the resonance frequency of the bass reflex port and the bass radiation hole as low as possible. it can.

According to the embodiment of the present invention, a speaker system provided in various audio devices, in particular, an SR system,
The present invention can be applied to speaker systems for home audio, radio cassette players, karaoke machines, personal computers, televisions, and the like. In particular, when the speaker unit is built in a wall surface, an automobile door, or the like, the speaker unit may be attached to this attachment portion (which becomes a baffle plate) by the method of the above-described embodiment. Further, in order to enhance the aesthetic appearance, the opening toward the outside of the ventilation path may be covered with a cloth or the like that allows sound to pass.

When the purpose is to reproduce a deep bass range, a resonance duct is added to a speaker system in which a speaker unit is installed using the configuration of the present invention, and motional feedback and an equalizer operation are added. It is also possible to efficiently extend the low-frequency reproduction limit frequency.

Here, the present inventors have proposed a speaker system of the present invention based on the following specifications (with a bass reflex duct using a spacer and no bass reflex duct) and a conventional speaker system (based on the above-mentioned specifications). An experiment was conducted to compare the frequency characteristics with those without a spacer and without a bass reflex duct.

(Specification of speaker system) A sealed enclosure having an actual volume of 163 L (internal volume 181 L) (internal size H90.8 cm × W45.2 cm × D44.2)
cm), a woofer unit (fo = 40HZ) having a diameter of 38 cm as a speaker unit is attached at a predetermined distance X from a baffle plate by a spacer as in the embodiment of FIGS. 1 and 2, for example.

The predetermined distance X is set such that the length of the spacer is 5 mm, 10 mm, 15 m while hearing the music signal.
m and 20 mm, frequency characteristics and impedance characteristics are measured, and the most appropriate values are set. Furthermore, in order to improve the ultra-low frequency characteristics, for example, two bass reflex ducts (vinyl chloride pipes) of 8 cm × 38 cm are provided.

In this case, an opening is formed in the lower part of the baffle plate, and a pipe duct arranged horizontally in the enclosure is fixed so that the front end opening communicates with the opening. Thus, the inside of the enclosure communicates with the outside of the enclosure via the bass reflex duct.

In the case of the woofer unit having a diameter of 38 cm used, in the case of a closed type enclosure, the ideal value of the actual volume is 225 L, but the actual volume is 165 L as described above.
(72.4% of the ideal value), and the characteristic of the conventional speaker system is, as shown in the graph of FIG.
Since the speaker unit having a large value of 0 is attached to the enclosure having a small volume, the low frequency has a characteristic of attenuating from 150 Hz. Therefore, it has no heavy feeling and has poor sound quality in the middle range, and cannot be used for HiFi reproduction.

As shown in the graph of FIG. 12, the characteristics of the speaker system of the present invention (using a 15 mm spacer and no bass reflex duct) were able to obtain a substantially flat characteristic up to 60 Hz. In addition, the speaker system (1) of the present invention.
Two 8 cm x 38 cm bass reflex ducts using 0 mm spacers [The length of the bass reflex duct was made as long as possible to the full depth of the enclosure. 13), as shown in the graph of FIG. 13, the bass reproduction limit of the 6 db down value is 50 HZ, and the frequency characteristics from 60 HZ to 100 HZ are quite flat.

Therefore, in this speaker system, the sound of a low-music instrument such as a contrabass such as jazz and classical music is reproduced directly and realistically without distortion, muffled sound or exaggeration. Also, at the same time, pizzicato,
The timbre of the high-frequency noise components generated when playing the strings characteristic of electric bass slap playing has been significantly improved.

By combining the speaker unit having a small stiffness S0 and a large effective vibration mass M0 with the configuration of the present invention (using a spacer), the size of the system can be further reduced (the volume of the enclosure at the time of using the current speaker unit of the same type). (Reduced by about 30% in comparison with the prior art), it was also found that it could be realized easily and at low cost without deteriorating low frequency characteristics.
In the above description, a speaker unit having a diameter of 38 cm has been described.
An empirical formula for obtaining the optimum distance X2 from the baffle plate in a speaker unit having a diameter of m is shown below. That is, the ratio of the diaphragm opening area of the speaker unit having a diameter of 38 cm and the optimum distance X to another diameter (for example, 30 c
38cm when applied to a speaker unit
The same effect as that of the speaker unit having the caliber was obtained. Therefore, assuming that the opening area of the diaphragm of a speaker unit of 38 cm in diameter is Sa and the opening area of the diaphragm of another speaker unit (for example, 30 cm in diameter) is Sb, the optimum distance X1 when using the speaker unit of 38 cm in diameter is 10 mm.
Therefore, Sa: X1 = Sb: X2 Therefore, X2 = (X1 · Sb) / Sa, and
Here, Sa = 80384 square mm, X1 = 10 mm
Therefore, the optimum distance from the baffle plate X2 = 10Sb /
80384.

Further, the present inventors also conducted the following experiments (1) to (3). (1) Using a spacer for a small-diameter speaker unit, a ventilation hole is formed in an enclosure, and sound quality is examined. (2) Ventilation holes are formed in the enclosure using spacers in a medium-diameter speaker unit of about 20 cm in diameter, and sound quality is examined. In this case, a washer having a thickness of about 1 mm was used as the spacer.

According to the results of these experiments, it was possible to produce a low tone that is approximately 5 degrees below the scale notation, as well as to enhance the separation, depth and realism of musical instruments. In addition, 20
For medium-diameter speaker units with a diameter of about cm, if the volume of the enclosure is reduced to a fraction of the standard value, it is necessary to fill the enclosure with sound absorbing material to reduce the internal impedance of the enclosure. preferable. In this case, the effect of reducing the influence of the inertial vibration of the air spring inside the enclosure on the diaphragm can be expected more than the effect of resonance of the enclosure.

(3) A three-way loudspeaker system composed of independent speaker units for low, medium and treble sounds is formed by using a spacer to form a ventilation hole in an enclosure to examine sound quality.

According to the results of the experiment, it was confirmed that the sound quality was improved in all of the low, medium, and high speaker units. That is, according to the present invention, the sound quality can be improved not only in the bass sound but also in the middle and treble speaker units.

[0068]

As described above, according to the present invention,
With a simple configuration formed on the outer periphery of the speaker unit along substantially the entire inner periphery of the opening of the baffle plate, the enclosure can be reduced in size and weight, while expanding the bass range, reducing distortion, and improving efficiency. And transient characteristics,
It is possible to provide a high sound quality speaker system which is excellent in economy.

In particular, according to the invention according to claims 4 to 10, the gap serving as an air passage is formed between the inner surface of the outer peripheral portion of the speaker unit and the front surface of the baffle plate or between the outer surface of the outer peripheral portion of the speaker unit and the back surface of the baffle plate. In addition, since it is formed by interposing a plurality of spacers, resonance can be increased by vibrating the enclosure, and the effect of the present invention can be more effectively exerted.

According to the sixth aspect of the present invention, since the spacer is made of a material such as rubber or the like having a high vibration absorption rate or a material such as a metal or the like, the resonance of the baffle plate is controlled. Is possible.

According to the fourteenth aspect of the present invention, since the bass reflex port provided by the bass reflex duct and the bass sound radiating hole for the bass reflex are provided, the resonance frequency of the bass reflex port and the bass radiating hole can be increased. By taking the lowest possible range, the lowest range can be obtained.

[0072]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a first embodiment of a speaker system according to the present invention.

FIG. 2 is a longitudinal sectional view of a second embodiment.

FIG. 3 is a perspective view illustrating a method of fastening a baffle plate, a spacer unit, and a speaker unit with screws.

FIG. 4 is a diagram showing a modification of the first embodiment, and FIG.
Is a perspective view, and (B) is a sectional view.

FIG. 5 is a longitudinal sectional view showing another modification of the first embodiment.

FIGS. 6A and 6B are perspective views of third and fourth embodiments.

FIG. 7 is a perspective view of a fifth embodiment.

FIG. 8 is a perspective view of a sixth embodiment.

FIG. 9 is a perspective view of a seventh embodiment.

FIG. 10 is a perspective view of an eighth embodiment.

FIG. 11 is a graph showing experimental results of frequency characteristics of a conventional speaker system.

FIG. 12 is a graph showing experimental results of frequency characteristics of the speaker system of the present invention.

FIG. 13 is a graph showing experimental results of frequency characteristics of the speaker system of the present invention.

14A and 14B are longitudinal sectional views of an example of a conventional speaker system.

FIG. 15 is a perspective view of another example of a conventional speaker system.

[Explanation of symbols]

 Reference Signs List 10 enclosure 11 baffle plate 12 opening 13 speaker unit 14 flange 15 spacer 15A spacer 18 spacer 19 rib 20 spacer 21 rib 22 rib 22A groove 23 mounting piece 24 support member 25A opening 25 mounting piece 26 Mounting piece 27 Mounting piece

Claims (14)

[Claims] 1. A speaker system comprising: an enclosure; and a speaker unit attached to an opening of a baffle plate on a front surface of the enclosure. A speaker system comprising a predetermined ventilation path formed along the entire inner circumference and communicating the inside and outside of the enclosure. 2. The baffle plate according to claim 1, wherein the speaker unit is attached to the baffle plate such that a gap serving as the ventilation path is formed between a rear surface of an outer peripheral portion of the speaker unit and a front surface of the baffle plate. The speaker system as described in the above. 3. The speaker unit according to claim 1, wherein the speaker unit is attached to the baffle plate such that a gap serving as the ventilation path is formed between a front surface of an outer peripheral portion and a rear surface of the baffle plate. The speaker system as described in the above. 4. The method according to claim 1, wherein the gap is formed by interposing a plurality of spacers between the inner surface of the outer periphery of the speaker unit and the front surface of the baffle plate or between the outer surface of the outer periphery of the speaker unit and the rear surface of the baffle plate. The speaker system according to claim 2 or 3, wherein 5. The apparatus according to claim 1, wherein the spacer is formed of a substantially tubular member, and a fixture penetrating the substantially tubular member is fixed to an outer peripheral portion of the speaker unit and a baffle plate. 5. The speaker system according to any one of 2 to 4. 6. The speaker system according to claim 5, wherein said spacer is formed of a material having a predetermined vibration absorption rate. 7. The speaker system according to claim 2, wherein the spacer is formed integrally with a speaker unit or a baffle plate. 8. A plurality of spacers projecting rearward from the rear surface of the outer periphery of the speaker unit, and the spacers are located at positions rearward from the rear surface of the outer periphery of the speaker unit to connect the spacers to each other. And a ring-shaped rib portion, which is formed integrally, and the rib portion is attached to the front surface of the baffle plate.
The speaker system as described in the above. 9. The plurality of spacers projecting forward from the front surface of the outer periphery of the speaker unit, and the plurality of spacers are connected to each other at a position forward of the front surface of the outer periphery of the speaker unit. And a ring-shaped rib portion, which is formed integrally, and attached to the rear surface of the baffle plate.
The speaker system as described in the above. 10. The gap is formed by integrally forming a plurality of ribs constituting a spacer around an opening of a baffle plate and forming a groove on an inner peripheral surface of the rib, while forming a groove on an outer peripheral portion of the speaker unit. 4. The speaker system according to claim 2, wherein a plurality of mounting pieces protruding outward are formed, and the mounting pieces are fitted into grooves of the ribs while rotating the speaker unit. . 11. The gap portion has an upper wall portion and a lower wall portion of the enclosure extending forward, and upper and lower ends of a pair of left and right support members disposed on the front surface of the baffle plate are respectively connected to the extended portions. 3. The speaker member according to claim 2, wherein an outer peripheral portion of the speaker unit is attached to the support member, and the outer peripheral portion of the speaker unit is separated from the baffle plate.
The speaker system as described in the above. 12. A method according to claim 1, wherein a mounting piece having a plurality of openings serving as said air passages is formed integrally with an outer peripheral portion of the speaker unit, and said mounting piece is mounted on an outer surface or an inner surface of the baffle plate. The speaker system according to claim 1, wherein 13. A mounting piece protruding from the inner peripheral surface of the opening of the baffle plate, while a mounting piece protruding from the outer peripheral surface of the speaker unit is formed, and the mounting piece is attached to the mounting piece. 2. The speaker system according to claim 1, wherein a gap portion serving as the ventilation path is formed between an inner peripheral surface of the opening and an outer peripheral portion of the speaker unit. 14. The speaker system according to claim 1, wherein the enclosure has a bass reflex port or a bass emission hole for a bass reflex.