JP3421558B2 - Speaker system - Google Patents

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 conventional speaker systems, the hermeticity of an enclosure is generally important. this is,
This is because the 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 characteristic. Especially, the sound wave leaking from the part farther from the speaker unit is more likely to have the same sound pressure phase in the enclosure and is sharper. Cause interference.

Therefore, it is an iron rule to attach a typical speaker unit to an enclosure baffle so as to maintain the airtightness of the attaching surface, and this attaching method is handled in a textbook. For example, in FIG.
As shown in (B), the speaker unit 1 is attached such that the inner surface of the flange portion 2 at the outer peripheral portion thereof and the front surface of the baffle plate 4 of the enclosure 3 are closely attached, or the speaker unit 1 is attached to the outer surface of the flange portion 2. Baffle board 4
It is attached so that it is in close contact with the rear surface.

[0004]

Generally, the low frequency characteristic of the speaker system is limited to the lowest resonance frequency of the unit, and it is necessary that the enclosure in which the speaker system is mounted has sufficient capacity to reduce the lowest resonance frequency of the unit. Although it is a condition to reproduce, in the conventional speaker system that emphasizes the hermeticity of the enclosure, the low frequency characteristics and transient of the speaker system are affected by the influence of the inertia 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 low-frequency characteristics are significantly attenuated.

A speaker unit having a large-diameter diaphragm is suitable for low-frequency reproduction, but the use of the large-diameter diaphragm inevitably increases the enclosure capacity and inevitably increases the size of the speaker system. Therefore, a speaker system that attempts to reproduce a low frequency range is generally large in size, heavy in weight, expensive and inferior in handleability.

In order to solve such problems and downsize the system, a bass reflex, a resonance chamber, and an acoustic tube are used.
A load system, a closed system with sound absorbing material filled in, 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 of them have complicated structures. Inevitably, production costs will rise. Also, in these cases, there was a peculiar sound quality tendency peculiar to the system.
Incidentally, as a cabinet (enclosure) of a speaker system, conventionally, as shown in FIG. 15, a speaker unit 5 is attached to an auxiliary baffle plate 6, which is spaced from a baffle plate 8 in front of the cabinet (enclosure) 7. An installed type RJ cabinet is known. However, in this R-J type cabinet, the ventilation path that connects the inside and the outside of the cabinet 7 is
The baffle plate 8 is located at both ends of the opening 9 so that the bass characteristic is improved, but the output sound pressure level in the middle range is lowered, and a peak appears near the bass reproduction limit frequency. There is.

Further, conventionally, a partition plate is arranged behind the diaphragm with a predetermined distance from the diaphragm, and the inner peripheral side of the acoustic space formed by the partition plate and the diaphragm is inside the speaker box. It has been proposed that the outer peripheral side is connected to the space and is opened to the front side of the speaker box via a ventilation hole ring (see Japanese Patent Laid-Open No. 195796/1990).

In this structure, the space formed by the partition plate and the diaphragm communicates with the space inside the speaker box on the inner peripheral side and is open to the front surface of the speaker box on the outer peripheral side. Can function as a duct that effectively guides the bass reproduction output of the speaker, and can enhance the bass.

However, in this technique, the diaphragm unit, that is, the cone, is integrally attached with the partition plate and the ventilation hole ring to form the speaker unit, thereby forming the space portion as described above. Therefore, the speaker unit itself has to have a special specification, and it cannot be easily applied to an existing speaker system. In addition, the structure of the cone is complicated and the weight is increased, which is disadvantageous in cost. Further, since the space as described above is bent, the air in the enclosure is not discharged smoothly, and the influence of the inertial vibration of the air inside the enclosure on the diaphragm is effectively prevented. You can't say that you will get it.

The present invention has been made to solve the conventional problems as described above, and in a speaker system, a speaker system having a small size and a light weight is obtained by a simple improvement of a mounting structure of 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 speaker system while improving the performance.

[0011]

Means for Solving the Problems] Therefore, Ru engages the present invention
Scan Pikasusutemu includes enclosure, a speaker unit attached to the opening in the front baffle plate of the enclosure, in the speaker system including a prior SL speaker units outer circumferential region, the bar
It is formed along almost the entire inner circumference of the opening of the baffle plate.
It is characterized in that a predetermined air passage for communicating the inside and outside of the roser is provided .

The present invention is characterized in that the speaker unit is attached to the baffle plate so that a gap portion serving as the ventilation path is formed between the rear surface of the outer peripheral portion and the front surface of the baffle plate.

The present invention is characterized in that the speaker unit is attached to the baffle plate such that a gap portion serving as the air passage is formed between the front surface of the outer peripheral portion and the rear surface of the baffle plate.

According to the present invention, the gap is formed by interposing a plurality of spacers 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. It is characterized by

[0015] The present invention is characterized by being formed by the spacer composed of a substantially tube-shaped member, and fixing the fixture to pass through the the symbolic tube-shaped member and the speaker unit outer peripheral portion and the baffle plate And

The present invention is characterized in that the spacer is formed of a material having a predetermined vibration absorption rate.

The present invention is characterized in that the spacer is integrally formed with a speaker unit or a baffle plate.

According to the present invention, the gap portion is provided on the outer peripheral portion of the speaker unit, and includes a plurality of spacer portions projecting rearward from the rear surface of the outer peripheral portion, and the spacer portions located at positions rearward from the rear surface of the outer peripheral portion of the speaker unit. And a ring-shaped rib portion for connecting the two are integrally formed, and the rib portion is attached to the front surface of the baffle plate.

According to the present invention, the gap portion is provided on the outer peripheral portion of the speaker unit, a plurality of spacer portions projecting forward from the front surface of the outer peripheral portion, and the spacer portions located at the front position from the front surface of the outer peripheral portion of the speaker unit. Is formed by integrally molding a ring-shaped rib portion for connecting the ribs and attaching the rib portion to the rear surface of the baffle plate.

According to the present invention, the gap is formed by integrally molding a plurality of ribs forming a spacer around the opening of the baffle plate and forming a groove on the inner peripheral surface of the rib while the outer periphery of the speaker unit is formed. It is characterized in that a plurality of mounting piece portions projecting outward are formed in the portion, and the mounting piece portions are fitted into the grooves of the rib portion while rotating the speaker unit.

According to the present invention, in the gap portion, an upper wall portion and a lower wall portion of the enclosure are extended forward, and upper and lower end portions of a pair of left and right support members arranged on the front surface of the baffle plate are extended portions. And the 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.

According to the present invention, a mounting piece is integrally formed on the outer peripheral portion of the speaker unit, and a plurality of openings of the gap serving as the air passage are formed, and the mounting piece is mounted on the outer surface or the inner surface of the baffle plate. It is characterized by doing so.

According to the present invention, the mounting piece portion projecting from the inner peripheral surface of the opening of the baffle plate is formed, while the mounting piece portion projecting from the outer peripheral surface of the speaker unit is formed, and the mounting piece portion is mounted on the mounting piece portion. In addition, a gap serving as the air passage is formed between the inner peripheral surface of the opening and the outer peripheral portion of the speaker unit.

The present invention is characterized in that the enclosure has a bass reflex port or a bass emission hole for a bass reflex.

The operation of the present invention will be described. In the present invention, a predetermined air passage communicating between the inside and the outside of the enclosure functions as a sound hole and operates the bass reflex.
Emits resonance sound inside the enclosure,
Increase the range. Also, the influence of the inertial vibration of the air spring inside the enclosure on the diaphragm is reduced,
The transient characteristics over the entire playback band are improved, and sound quality that is flexible and light is obtained.

Further, since the ventilation passage 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, and Because the curve of the cone paper of the unit is gently formed toward the ventilation path,
The resistance that the cone paper receives due to the change in air pressure inside the enclosure is effectively reduced, and the sound quality can be improved more effectively.

In particular, since the air passage is formed at a position close to the speaker unit, the bass frequency characteristic can be enhanced and at the same time the characteristic can be prevented from being disturbed at other frequencies. In particular, as in the invention according to claim 1 ,
With a gap formed as a ventilation path formed by interposing a plurality of spacers 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, the spacer is The vibration of the frame of the speaker unit is transmitted to the baffle plate, and it operates as if it were a contrabass piece (bridge) and vibrates the enclosure to increase resonance.

[0028] In addition, by design intent, a scan pacer, rubber
It is also possible to control the resonance of the baffle plate by using a material such as a resin having a high vibration absorption rate or a material having a small vibration absorption rate such as a metal .

In the invention according to claim 2 , in the bass reflex port provided with the bass reflex duct and the bass sound emission hole for the bass reflex, the resonance frequency of the bass reflex port and the bass sound emission hole is made as low as possible. By doing so, the lowest range can be taken.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. First, the basic concept of the present invention will be described. The problem of miniaturization of the speaker system and deterioration of the low-frequency characteristic due to the miniaturization 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, a musical instrument such as a guitar or a contrabass produces a good low tone by the action of the resonance box, although it has only a string, which is a diaphragm having a very small surface area. Also, the harmonics that are the overtone components are extremely rich. This is because the vibration of the string, which is the vibrating element, is transmitted to the resonance box through the bridge to maximize the resonance of the body.

As is clear from this example, the simplest and most efficient reproduction of bass sound by the speaker system is to use the enclosure as a resonance box. Therefore, in the present invention, for example, by providing a predetermined ventilation path formed along the substantially entire inner circumference of the opening of the baffle plate at the outer peripheral portion of the speaker unit to communicate the inside and outside of the enclosure, for example, the speaker unit The diaphragm is received by the air spring inside the enclosure by not placing it in close contact with the opening surface of the baffle plate of the enclosure and installing it at a position away from the opening so that the low frequency response does not deteriorate due to the wraparound of bass. The basic concept is to avoid the influence and use the enclosure efficiently as a resonance box.

Next, an embodiment of the speaker system based on the basic concept of the present invention will be described. FIG. 1 is a vertical cross-sectional view of the speaker system of the first embodiment. In this figure, the speaker system is an enclosure 10.
And a speaker unit 13 attached to the opening 12 of the baffle plate 11 on the front surface of the enclosure 10,
It is configured to include.

In the speaker unit 13, a gap is formed between the rear 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 so as to form a gap serving as a predetermined ventilation path for communicating the inside and the outside of the enclosure 10. It is attached to the baffle plate 11. In this embodiment, between the flange portion 14 the inner surface and the baffle plate 11 the front of the speaker unit 13 the outer peripheral portion, by interposing a plurality of tubes shaped spacer 15, screw 16 as a fixture which is inserted into the spacer 15 The speaker unit 13 to the baffle plate 11
I am trying to attach it to.

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

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 vertical cross-sectional view of the speaker system of the second embodiment. In this embodiment, the speaker unit 13 is attached so that a gap portion having 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, between the flange portion 14 the front and the baffle plate 11 rear of the speaker unit 13, by interposing a plurality of tubes shaped spacer 15 with screws 16 inserted through the spacer 15,
The speaker unit 13 is attached to the baffle plate 11.

The spacer 15 is 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 portion 14 of the speaker unit 13 may be attached to A. For this attachment, as shown in FIG. 4, rivets 15B or split pins may be used. Alternatively,
A pin and a C ring fitted in 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. Inside the recess 11A, the flange 14 and the spacer 1 are formed.
5 and the baffle plate 11 are fastened, the speaker unit 13 does not project from the front surface of the baffle plate 11, and the speaker system 10 has a smart shape.

FIGS. 6A and 6B are perspective views of the speaker unit of the speaker system according to the third and fourth embodiments. The embodiment shown in FIG. 6A has a speaker unit 1
3, a plurality of spacer portions 18 protruding 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. And are integrally formed, and the rib portion 19 is attached to the front surface of the baffle plate by using a screw and a nut.

In the embodiment shown in FIG. 1B, the flange portion 14 of the speaker unit 13 has a plurality of spacer portions 20 protruding forward from the front surface of the flange portion 14 and the flange portion 1.
(4) A ring-shaped rib portion 21 that is located forward from the front surface and that connects the spacer portions 20 to each other is integrally formed, and the rib portion 21 is attached to the back surface of the baffle plate using screws and nuts. It is a thing.

FIG. 7 is a perspective view of a speaker unit in the speaker system of the fifth embodiment. In this embodiment, a plurality of rib portions 22 forming a spacer are integrally formed around the opening 12 of the baffle plate 11, and the rib portions 22 are formed.
While forming the groove 22A on the inner peripheral surface of the speaker unit 13, while forming a plurality of mounting piece portions 23 protruding outward on the flange portion 14 of the speaker unit 13, while rotating the speaker unit 13,
The mounting piece portion 23 is fitted in the groove 22A of the rib portion 22.

FIG. 8 is a perspective view of a speaker unit in the speaker system of 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 end portions of the 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 portion are formed. A gap that serves as a ventilation path is formed between the gap 12 and the groove 12.

FIG. 9 is a perspective view of a speaker unit in the speaker system of the seventh embodiment. In this embodiment, a mounting piece 25 having a plurality of openings 25A formed on the flange 14 of the speaker unit 13 is integrally molded, and the mounting piece 25 is attached to the outer surface or the inner surface of the baffle plate. It was done. In this case, a ventilation port formed of the opening 25A is formed on the outer peripheral portion of the speaker unit 13.

FIG. 10 is a perspective view of a speaker unit in the speaker system of the eighth embodiment. In this embodiment, the mounting piece portion 26 protruding from the inner peripheral surface of the opening 12 of the baffle plate 11 is formed, while the speaker unit 1 is formed.
3, a mounting piece portion 27 is formed so as to project also on the outer peripheral surface of 3, and the mounting piece portion 27 is attached to the mounting piece portion 26 with a screw 28 or the like. In this embodiment, a gap portion serving as a ventilation path 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 circumference of the opening of the baffle plate in the outer peripheral portion of the speaker unit to communicate the inside and the outside of the enclosure, the following operation / effect is achieved. That is, in the enclosure
A predetermined air passage communicating with the outside functions as a sound hole, and the bass reflex operation emits a resonance sound inside the enclosure to enhance the 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 sound quality that is flexible and has no heaviness is obtained. Further, since the ventilation passage 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, and the cone of the speaker unit is formed. Since the curve of the paper is gently formed toward the ventilation path, due to the change in air pressure inside the enclosure,
The resistance that the cone paper receives is effectively reduced, and the sound quality can be improved more effectively.

In particular, since the air passage is formed near the speaker unit along the substantially entire inner circumference of the opening of the baffle plate, the bass frequency characteristic is enhanced and at the same time.
It is possible to prevent the characteristic from being disturbed at other frequencies. By the way, when the air passage is largely separated from the speaker unit, as described in the related art, although the bass frequency characteristic can be enhanced, there is a drawback that the characteristic is 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 the vibration of a large diameter capable of achieving high efficiency and high input resistance in a small enclosure. A speaker unit having a plate can be used, and the speaker system can be made highly efficient and downsized 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 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. The embodiment has the following advantages. That is, the spacer transmits the vibration of the speaker unit frame to the baffle plate,
It acts as if it were a contrabass piece (bridge) and vibrates the enclosure to increase the resonance mentioned above.

Depending on the design intention, the spacer may be made of rubber.
It is also possible to control the resonance of the baffle plate by using a material such as a resin having a high vibration absorption rate or a material having a small vibration absorption rate such as a metal .

Furthermore, since a ventilation hole can be formed in the outer peripheral portion of the speaker unit by a simple improvement such as adding a spacer, changing the shape of the opening portion of the baffle plate, changing the shape of the outer peripheral portion of the speaker unit, the speaker unit itself is made special. Since it is not necessary to make specifications, it can be easily applied to an existing speaker system, does not complicate the structure of the speaker unit, does not increase the weight, and is advantageous in cost.

Further, as shown in FIG. 1, the bass reflex duct 2
With a bass reflex port according to No. 9, or with a bass sound emission hole (not shown) for bass reflex, the lowest frequency range can be achieved by keeping the resonance frequency of the bass reflex port and the bass sound emission hole as low as possible. it can.

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

For the purpose of reproducing the deep bass range, a resonance duct is further added to the speaker system in which the speaker unit is installed by 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-range reproduction limit frequency.

Here, the present inventors have made a speaker system of the present invention based on the following specifications (a bass reflex duct with a spacer is used 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 spacers and without bass reflex duct).

(Specifications of Speaker System) A closed type enclosure having an actual volume of 163 L (internal volume 181 L) (internal dimension H90.8 cm × W45.2 cm × D44.2).
A woofer unit (fo = 40HZ) having a diameter of 38 cm as a speaker unit is mounted at a predetermined distance X from the baffle plate by a spacer, as in the embodiment of FIGS. 1 and 2.

For the predetermined distance X, the length of the spacer is 5 mm, 10 mm, 15 m while listening to the music signal.
Change to m and 20 mm, measure the frequency characteristics and impedance characteristics, and set the most appropriate values. Further, in order to improve the super low frequency characteristics, for example, two 8 cm × 38 cm bass reflex ducts (vinyl chloride pipes) are provided.

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

The woofer unit with a diameter of 38 cm used has an ideal actual volume of 225 L in the case of a closed type enclosure, 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 with a large number of 0 was attached to the enclosure with insufficient volume, the low range has a characteristic of being attenuated from 150 Hz. Therefore, it does not feel heavy and has poor sound quality in the middle range, and cannot be used for HiFi reproduction.

As for the characteristics of the speaker system of the present invention (using a 15 mm spacer and no bass reflex duct), a substantially flat characteristic was obtained up to 60 HZ, as shown in the graph of FIG. In addition, the speaker system (1
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], the bass reproduction limit of 6 dB down value is 50 HZ, and 60 HZ to 100 HZ has a completely flat frequency characteristic, as shown in the graph of FIG.

Therefore, in this speaker system, the sound of a low music instrument such as a contrabass such as jazz and classical music is reproduced frankly and realistically without being distorted, muffled or exaggerated. At the same time, pizzicato,
The timbre of the high-pitched noise component that occurs when playing strings, which is characteristic of electric bass slap playing, has been dramatically improved.

[0063] Incidentally, a small stiffness S0, a large loudspeaker unit the effective vibration mass M0, the combination of the structure of the present invention (spacer used), a further miniaturization of the system (at the time of the same type speaker unit using the current enclosure It has also been found that the volume ratio can be reduced by about 30%) easily and at low cost without deterioration of low-frequency characteristics.
In addition, in the above, the speaker unit of 38 cm diameter is also
However, the other caliber (for example, 30c
From the baffle plate in the speaker unit
An empirical formula for obtaining the shortest distance X2 of is shown below. Immediately
A diaphragm opening area of a speaker unit with a diameter of 38 cm
And the optimum distance X of the other diameter (for example, 38c
38cm when applied to a speaker unit of m diameter)
An effect similar to that of a speaker unit having a caliber was obtained. Obey
The diaphragm opening area of a speaker unit with a diameter of 38 cm
Sa, speaker of other caliber (for example, 30 cm caliber)
If the diaphragm opening area of the unit is Sb, 38 cm mouth
Optimum distance X1 when using a speaker unit with a diameter of 10 mm
Therefore, Sa: X1 = Sb: X2 Therefore, X2 = (X1 · Sb) / Sa, where Sa = 80384 square mm and X1 = 10 mm, so the optimum distance from the baffle plate is X2 = 10Sb / 8.
Given at 0384.

Further, the present inventors also conducted the following experiments (1) to (3). (1) Use a spacer for a small-diameter speaker unit to form a ventilation hole in the enclosure and check the sound quality. (2) A spacer is used for a medium-diameter speaker unit with a diameter of about 20 cm, and a ventilation hole is formed in the enclosure to check the sound quality. In this case, a spacer having a washer shape with a thickness of about 1 mm was used.

According to the results of these experiments, notation of the scale is roughly made.
In addition to producing a bass sound that hits 5 degrees below, it was possible to enhance the separation, depth and presence of musical instruments. 20
For a medium-diameter speaker unit with a diameter of about cm,
The volume of the enclosure is as small as a fraction of the standard value
Internal impedance of the enclosure, if
In order to reduce the
It is preferable to fill. In this case, the enclosure
In the enclosure by the air passage, rather than the sound effect
The influence of the inertial vibration of the air spring on the diaphragm on the diaphragm
Especially, the reduced effect can be expected.

(3) The sound quality is examined by forming a ventilation hole in the enclosure by using a spacer in a three-way speaker system in which low-pitched sound, middle-pitched sound, and high-pitched sound are formed by independent speaker units.

According to the results of this experiment, the improvement of the sound quality was recognized over all the speaker units of low tone, middle tone, and high tone. That is, the present invention can improve the sound quality not only in the low-pitched sound but also in the middle-pitched sound and the high-pitched sound speaker unit.

[0068]

As described above, according to the present invention,
With a simple structure that is formed on the outer peripheral portion of the speaker unit along substantially the entire inner circumference of the opening of the baffle plate, the enclosure is made smaller and lighter, while the bass range is expanded, the distortion is reduced, and the efficiency is improved. And the transient characteristics,
It is possible to provide a high-quality speaker system with excellent economical efficiency.

In particular, according to the first aspect of the invention, a plurality of gaps serving as ventilation paths are provided 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. Since it is formed by interposing the spacer of (1), the enclosure can be vibrated to increase resonance, and the effect of the present invention can be more effectively exhibited.

According to the present invention, the spacer is made of rubber or the like.
Tree fat such as a vibration absorption of large material, or because formed by a small material such as metal, it is possible to control the resonance of the baffle plate.

According to the second aspect of the present invention, since the bass reflex port provided by the bass reflex duct is provided and the bass sound emission hole for the bass reflex is provided, the resonance frequency of the bass reflex port and the bass sound emission hole is possible. The lowest range can be achieved by setting it as low as possible.

[Brief description of drawings]

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

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

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

FIG. 4 is a diagram showing a modified example of the first embodiment, (A)
Is a perspective view, (B) is a sectional view

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

6A and 6B are perspective views of the 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 vertical cross-sectional views of an example of a conventional speaker system.

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

[Explanation of symbols]

10 enclosures 11 baffle board 12 openings 13 speaker unit 14 Flange 15 Spacer 15A spacer part 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

Continuation of the front page (56) Reference Japanese Unexamined Patent Publication No. 8-251683 (JP, A) Actual Open Sho 58-107683 (JP, U) Actual Open Sho 56-105986 (JP, U) Actual Open Sho 48-18127 (JP , U) Actual Kaihei 5-82195 (JP, U) Actual Kaisho 63-26191 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04R 1/28 310 H04R 1/02 101

Claims (2)

(57) [Claims] 1. An enclosure and the enclosure
Speaker attached to the opening of the front baffle plate
A speaker system that includes a unit and
And is formed along the substantially entire inner circumference of the opening of the baffle plate at the outer peripheral portion of the speaker unit.
A predetermined air passage communicating with the outside is provided, and the speaker unit is provided with the baffle and the outer peripheral rear surface thereof.
Integrally molded a plurality of ribs that constitute the spacer around the plate front opening, while forming a groove on the inner peripheral surface of the rib portion, before
Serial to form a plurality of mounting pieces which project outward on the outer peripheral portion of the loudspeaker unit, while turning the speaker unit, in fitting the said mount piece into the groove of the rib portion
The rear of the speaker unit and the front of the baffle plate
So that a gap is formed between
A speaker system characterized in that Wherein said enclosure claim 1 Symbol mounting speaker system characterized by having a bass radiation hole for bass reflex port or a bass-reflex.