JPH11205884A - Loudspeaker system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase sound radiation power without its becoming lost to improve the sound quality and to improve the sensitivity for low frequency sound components. SOLUTION: First and second loudspeaker units 3a, 3b are fixed to left and right side panels 1a, 1b of a speaker box 1. First and second sound radiation direction conversion sound ducts 21a, 21b are provided to emit a sound from respective front faces of the first and second speaker units 3a, 3b to a front direction of the speaker box 1. Then the sound from the rear face of the first and second speaker units 3a, 3b is emitted in front of the speaker box 1 by a bass reflex duct 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device suitable for being applied to a small and lightweight speaker device.

[0002]

2. Description of the Related Art Conventionally, a small and lightweight speaker device as shown in FIG. 14 has been proposed. In FIG. 14, reference numeral 1 denotes a small and lightweight speaker box made of a synthetic resin or the like, and a speaker unit 3 is fixed to a speaker mounting hole 2a formed on the upper side of a baffle plate 2 fixed to the front surface of the speaker box 1.

The speaker unit 3 is configured, for example, as follows. As shown in FIG. 14, a ring-shaped magnet 4, a plate 5 and a yoke 6 mounted so as to sandwich the ring-shaped magnet 4 are provided, and a magnetic field is formed between the inner peripheral side of the plate 5 and the center pole 6a of the yoke 6. The void 7 is formed. The frame 5 of the speaker is attached to the plate 5, and an edge 9 is provided on the outer periphery of the frame 8, and the outer periphery of the cone-shaped diaphragm 10 is held by the edge 9.

On the other hand, a voice coil bobbin 11 is mounted on the inner peripheral portion of the diaphragm 10, and a voice coil 12 is wound around the voice coil bobbin 11, and the voice coil 12 is formed by a plate 5 and a center pole 6a of a yoke.
Is inserted into the magnetic gap 7 formed by the above. Reference numeral 17 designates the voice coil 12 as the magnetic air gap 7
It is a damper for holding inside.

An audio signal from an input terminal 13 provided at a predetermined position outside the speaker box 1 is transmitted to a connection line 14.
To the terminal 15 of the speaker unit 3, and the audio signal from the terminal 15 is supplied to the voice coil 12 via the tinsel wire 16.

Further, a bass reflex duct 18 having an opening 18a on the same surface as the speaker mounting hole 2a of the baffle plate 2 is provided, and the phase of the sound emitted from the rear surface of the diaphragm 10 of the speaker unit 3 is inverted. Radiation is radiated from the duct 18 to the outside of the speaker box 1 so as to widen a low-frequency range of sound coming from the front surface of the diaphragm 10.

[0007]

When the diaphragm 10 vibrates to emit sound from the speaker unit 3, the force F of the vibration is equal to the effective mass m ₀ of the vibration system of the speaker unit 3 and the vibration mass. It is the product of the moving acceleration α of the system. F = m ₀ α

In general, when an object moves, there is a relationship between the action and the reaction (the action force and the reaction force have the same magnitude and opposite directions), and the diaphragm 10 of the speaker unit 3 vibrates. Then, the speaker box 1 receives this reaction force. In this case, when the speaker box 1 is lightweight, the speaker box 1 moves, the power of radiating sound of the speaker unit 3 is impaired, the power of radiating sound is weakened, and the sound quality is deteriorated. .

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to enhance the sound quality without impairing the radiation power of sound and to improve the sensitivity of bass sound.

[0010]

According to the speaker device of the present invention, first and second speaker units are fixed to the left and right plates of a speaker box, respectively, and the first and second speaker units are respectively positioned from the front of the speaker box. First and second sound radiation direction changing sound paths for radiating sound in front of the speaker box are provided, and sound from the back of the first and second speaker units is transmitted in front of the speaker box by a bass reflex duct. It radiates to.

According to the present invention, the first and second speaker units are fixed to the left and right plates, respectively, and the first and second sound radiation direction changing sound paths radiating in front of the speaker box are provided. Therefore, if the vibration forces of the diaphragms of the first and second speaker units are made equal, the speaker box can be firmly fixed, and the power of sound radiation to the front of the speaker box is impaired. And the sound quality can be improved.

According to the present invention, a sound from the front surface of each diaphragm of the two speaker units is radiated to the front of the speaker box by the first and second sound radiation direction changing sound paths, and a bass reflex duct. Since the sound is radiated further in front of the speaker box, the sound pressure from the front surfaces of the first and second speaker units and the sound pressure from the bass reflex duct are added, thereby reducing the low frequency range. And the sensitivity can be improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a speaker device according to the present invention will be described with reference to FIG. In FIG. 1, portions corresponding to those in FIG. 14 are denoted by the same reference numerals.

In the example of FIG. 1, reference numeral 1 denotes a small and lightweight speaker box formed of a synthetic resin or the like, and left and right side plates 1a and 1b constituting a baffle plate of the speaker box 1 are located at positions facing each other. The speaker units 3a and 3b are respectively fixed inside the speaker mounting holes 2a of the left and right plates 1a and 1b.

The loudspeaker units 3a and 3b have the same configuration, and are configured, for example, as shown in FIG. That is, a magnetic circuit is provided by providing the ring-shaped magnet 4, the plate 5 and the yoke 6 attached so as to sandwich the ring-shaped magnet 4, and between the inner peripheral side of the plate 5 and the center pole 6 a of the yoke 6. The magnetic gap 7 is formed.

The plate 5 is provided with a funnel-shaped frame 8 made of steel or the like for the speaker.
An edge 9 is provided on the outer peripheral portion of the diaphragm, and the outer peripheral portion of the cone-shaped diaphragm 10 is held by the edge 9.

On the other hand, a voice coil bobbin 11 is mounted on the inner peripheral portion of the diaphragm 10, and a voice coil 12 is wound around the voice coil bobbin 11, and the voice coil 12 is mounted on the center pole 6 of the plate 5 and the yoke 6.
a so as to be inserted into the magnetic gap 7 formed by a. The voice coil 12 is held in the magnetic gap 7 by a damper 17.

The same audio signal from an input terminal 13 provided at a predetermined position outside the speaker box 1 is supplied to each speaker unit 3 via connection lines 14a and 14b.
The signals are supplied to the terminals 15a and 3b, and the audio signals from the terminals 15 are supplied to the respective voice coils 12 via the tinsel wire 16.

In this case, in this embodiment, the vibration forces Fa and Fb of the respective diaphragms 10 of the speaker units 3a and 3b are made equal to each other. Fa = Fb

In the present embodiment, the speaker units 3a and 3a on the left and right sides of the speaker box 1, respectively.
Left and right chambers 20a and 20b having predetermined openings from the left and right ends of the rear plate 1d of the speaker box 1 so as to cover the front side of the speaker box 1b, and having openings in the front of the speaker box 1, are provided. By 20a and 20b, the sound from the front surface of each of the speaker units 3a and 3b is radiated to the front of the speaker box 1 to form sound radiation direction changing sound paths 21a and 21b.

The sound radiation direction changing sound paths 21a and 21b can be shortened in order to increase the efficiency of sound radiation on the front surface of the diaphragm 10 of the speaker units 3a and 3b.

In this embodiment, the speaker box 1
Has an opening 22a at the center of the front plate 1c.
A duct 22 for a bass reflex, which is formed of a tubular body extending perpendicularly to the inside of c, is provided. In this case, the phases of the sounds emitted from the back surfaces of the respective diaphragms 10 of the speaker units 3a and 3b are inverted, and the speaker box 1
To radiate outside of the diaphragm 10 to widen the bass range of the sound emitted from the front surface of the diaphragm 10.

In this embodiment, the speaker units 3a and 3b are fixed to the left and right plates 1a and 1b of the speaker box 1 as described above, and the sound radiation direction changing sound paths 21a and 21b radiating in front of the speaker box 1 are provided. Since the vibration forces Fa and Fb of the respective diaphragms 10 of the speaker units 3a and 3b are made equal to each other, the speaker box 1 can be firmly fixed, and the power of sound radiation to the front of the speaker box 1 can be reduced. There is an advantage that the sound becomes powerful without being damaged and the sound quality can be improved.

Further, according to this embodiment, the sound from the front surface of the diaphragm 10 of each of the two speaker units 3a and 3b is radiated to the front of the speaker box 1 by the sound radiation direction changing sound paths 21a and 21b. Each diaphragm 1 of each of the speaker units 3a and 3b is formed by a bass reflex duct 22.
The sound pressure from the front of the speaker units 3a and 3b is added to the sound pressure from the bass reflex duct 22, since the sound from the back of the speaker 0 is radiated forward by inverting the phase. A strong bass can be radiated with high sensitivity, whereby the bass range can be expanded and the sensitivity can be improved.

FIGS. 2 to 13 show other examples of the embodiment of the present invention. 2 to FIG. 13, the same reference numerals are given to the portions corresponding to FIG. 1 and FIG.

FIG. 2 shows the left and right chambers 20a and 20a of FIG.
0b is a box shape, the sound radiation direction changing sound paths 21a and 21b having openings at the front surface of the speaker box 1, and the duct 22 is a bent duct so that the length of the duct can be increased and the opening area can be increased. This is to increase the radiation efficiency. The example of FIG. 2 is otherwise the same as the example of FIG.

It can be easily understood that the same operation and effect as in FIG. 1 can be obtained in the embodiment of FIG.

FIG. 3 shows the left and right chambers 20a of FIG.
2 and 20b are box-shaped similarly to the example of FIG.
21b, and the duct 22 is a T-shaped tubular duct having a bent portion along the rear plate 1d at the front end in the speaker box 1. In the example of FIG. 3, other parts are the same as those of FIG. It is composed.

It can be easily understood that the same operation and effect as in FIG. 1 can be obtained in the embodiment of FIG.

FIG. 4 shows a speaker box 1 in which the left and right chambers 20a and 20b of FIG. 1 are box-shaped as in FIG.
Sound direction changing sound paths 21a, 21 having an opening in front of the
a duct 22 for the bass reflex a speaker unit 3a and 3b respectively opening 22a ₁ and 22a ₂ on the lower side of the front plate 1c of the respective well as is b, respectively orthogonal speaker box 1 on the inside of the front plate 1c to as constituted by two ducts 22 ₁ and 22 ₂ consisting of a cylindrical body extending.

In the example of FIG. 4, the front plate 1c
A speaker mounting hole 2a is formed at each of opposing positions of the rear plate 1d and the speaker units 3c similar to the speaker units 3a and 3b, respectively, inside the speaker mounting holes 2a of the front plate 1c and the rear plate 1d. And 3d are fixed respectively.

The same audio signal from an input terminal 13 provided at a predetermined position outside the speaker box 1 is transmitted to the respective speaker units 3a, 3b, 3c and 3d via connection lines 14a, 14b, 14c and 14d, respectively. The voice signals are supplied to the respective terminals 15, and the audio signals from the respective terminals 15 are supplied to the respective voice coils 12 via the tinsel wires 16.

In this case, in this example, the vibration forces Fa and Fb of the respective diaphragms 10 of the speaker units 3a and 3b are made equal to each other, and the vibration forces Fc and Fc of the respective diaphragms 10 of the speaker units 3c and 3d. Fd are made equal to each other.

Fa = Fb Fc = Fd The configuration of FIG. 4 is otherwise the same as that of FIG.

In the example of FIG. 4, the same operation and effect as in the example of FIG. 1 can be obtained. Further, in the example of FIG.
And speaker units 3c and 3d provided on the rear plate 1d, respectively, and the diaphragm 1 of the speaker units 3c and 3d is provided.
Since the zero vibration force Fc and Fd are made equal to each other, there is an advantage that the speaker box can be more firmly prevented from moving in the front-rear direction, and the sound quality can be further improved.

FIG. 5 shows an example of the bass reflex duct 22 shown in FIG.
An opening 22a is provided in the rear face plate 1d of the speaker box 1 and connected to the opening 22a along the rear face plate 1d of the speaker box 1 and the outer peripheries of the left and right chambers 20a and 20b. it is obtained so as to provide a left and Migiotodo ducts 22b and 22c having left and right openings 22a ₁ and 22a ₂ radiates.

[0037] In this case, the duct 22 for the bass reflex with left and right openings 22a ₁ and 22a ₂ of the duct 22 for the bass reflex is located outside the opening of the left and right sound radiating direction converting sound channel 21a and 21b, Since the lengths of 22b and 22c can be increased, the aperture area can be increased and the radiation efficiency can be increased. The other configuration of FIG. 5 is the same as that of FIG.

It can be easily understood that the same operation and effect as in the example of FIG. 1 can be obtained in the example of FIG.

FIG. 6 shows an example of the left and right chambers 20a and 20a of FIG.
The sound path changing sound paths 21a and 21b having openings on the front surface of the speaker box 1 have a box shape of 0b, and the configuration of FIG. 6 is otherwise the same as that of FIG.

It can be easily understood that the same operation and effect as in FIG. 1 can be obtained also in the example of FIG.

In the example shown in FIG. 7, the duct formed of the cylindrical body in the speaker box 1 shown in FIG. 6 is omitted, and the sound path ducts 22b and 22b are omitted.
2c constitutes a bass reflex duct. In this case, the sound from the back of the diaphragm 10 of each of the speaker units 3a and 3b is radiated by inverting the phase to the outside of the speaker box 1 through the openings 22a → the sound ducts 22b and 22c → the openings 22a ₁ and 22a _2. Is done.

The example of FIG. 7 is otherwise the same as the example of FIG. It can be easily understood that the same operation and effect as in the example of FIG. 1 can be obtained in the example of FIG.

FIG. 8 shows an example of the left and right chambers 20a and 20a of FIG.
0b, partition plates 30a and 30b of a predetermined length extending from the front plate 1c of the speaker box 1 are provided at predetermined intervals in front of the speaker units 3a and 3b, and an effective mass m ₀ of the vibration system of the speaker units 3a and 3b. Is increased, and the lowest resonance frequency f ₀ is reduced to expand the low frequency range.

Incidentally, the lowest resonance frequency f ₀ of the speaker units 3a and 3b is Is determined by Here S ₀ is the stiffness determined by the speaker unit, the speaker box or the like.

In the example shown in FIG. 8, the other components are the same as those shown in FIG. It can be easily understood that the same operation and effect as in FIG. 1 can be obtained also in the example of FIG.

FIG. 9 shows an example in which the sound path duct 22c of the bass reflex duct of FIG. 6 is omitted. Therefore, in the example of FIG. 9, the sound from the back of the diaphragm 10 of the speaker units 3a and 3b is transmitted from the duct 22 → the opening 22a → the sound path duct 22.
b → emitted from the speaker unit ₁ through the opening 22a ₁ with its phase inverted.

The configuration of FIG. 9 is otherwise the same as that of FIG. It can be easily understood that the same operation and effect as in the example of FIG. 1 can be obtained in the example of FIG.

[0048] Figure 10 example the left sound passage ducts 22b and 22c opening 22a ₁ and 22a ₂ of 6 cases and the right chamber 20a
And 20b, the sound ducts 22b and 22c
The sound from the diaphragm 10 of the speaker units 3a and 3b
Are added to the sound from the front of the speaker box 1 through the left and right sound radiation direction changing sound paths 21a and 21b, respectively.

The example of FIG. 10 is otherwise the same as the example of FIG. It can be easily understood that the same operation and effect as in the example of FIG. 1 can be obtained in the example of FIG.

FIG. 11 shows an example of a wall 31 extending the left and right rooms 20a and 20b of FIG.
A predetermined opening 31a is provided at the center of the front wall 31.
And the sound from the left and right sound radiation direction changing sound paths 21a and 21b and the sound from the bass reflex duct 22 are added and radiated to the outside of the speaker box 1 from the opening 31a. It was made.

The example of FIG. 11 is otherwise the same as the example of FIG. It can be easily understood that the same operation and effect as in the example of FIG. 1 can be obtained in the example of FIG.

FIG. 12 shows a wall 31 which extends the left and right rooms 20a and 20b of FIG.
A predetermined opening 31a is provided at the center of the front wall 31.
The sound from the left and right sound radiation direction changing sound paths 21a and 21b and the sound from the bass reflex duct 22 are added, and the sound is radiated to the outside of the speaker box 1 from the opening 31a. It is like that.

The example of FIG. 12 is otherwise the same as the example of FIG. It can be easily understood that the same operation and effect as in the example of FIG. 1 can be obtained in the example of FIG.

FIG. 13 shows a wall 32 which extends the sound path ducts 22b and 22c of FIG.
A predetermined opening 32a is provided at the center of the front wall 32.
The sound from the left and right sound radiation direction changing sound paths 21a and 21b and the sound from the bass reflex sound path ducts 22b and 22c are added, and the sound from the opening 32a in front of the speaker box 1 is added. It radiates to the outside.

The speaker units 3 of the partition plates 30a and 30b in the left and right chambers 21a and 21b, respectively.
The shape of the surface facing a and 3b is changed to speaker unit 3a.
, 3b so as to conform to the shape of the front surface thereof, to increase the effective mass m ₀ of the vibration system of the speaker units 3a and 3b, and to lower the lowest resonance frequency f ₀ of the speaker units 3a and 3b. In this way, the bass range is expanded.

The example of FIG. 13 is otherwise the same as the example of FIG. It can be easily understood that the same operation and effect as in the example of FIG. 1 can be obtained in the example of FIG.

Incidentally, the speaker units 3a, 3
The b, 3c, and 3d are not limited to the above examples, and various speaker units such as a magnetic shield type speaker unit and a magnetic shield type speaker unit provided with a shield cover can be used.

Further, the present invention is not limited to the above-described example, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

[0059]

According to the present invention, the first and second speaker units are fixed to the left and right plates of the speaker box, respectively, and the first and second sound radiation direction changing sounds radiated in front of the speaker box. Since the path is provided, if the vibration force of the diaphragms of the first and second speaker units is made equal, the speaker box can be firmly fixed, and the radiation of sound to the front of the speaker box can be reduced. There is an advantage that the power can be enhanced without impairing the power and the sound quality can be improved.

According to the present invention, a sound from the front surface of each diaphragm of the two speaker units is radiated to the front of the speaker box by the first and second sound radiation direction changing sound paths, and a bass reflex duct. Since the sound is radiated to the front of the speaker box, the sound pressure from the front of the first and second speaker units and the sound pressure from the duct for bass reflex are added, whereby the low frequency There is an advantage that the sensitivity can be increased and the sensitivity can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an example of an embodiment of a speaker device of the present invention.

FIG. 2 is a cross-sectional view showing another example of the embodiment of the present invention.

FIG. 3 is a cross-sectional view showing another example of the embodiment of the present invention.

FIG. 4 is a cross-sectional view showing another example of the embodiment of the present invention.

FIG. 5 is a cross-sectional view showing another example of the embodiment of the present invention.

FIG. 6 is a cross sectional view showing another example of the embodiment of the present invention.

FIG. 7 is a cross-sectional view showing another example of the embodiment of the present invention.

FIG. 8 is a cross-sectional view showing another example of the embodiment of the present invention.

FIG. 9 is a cross-sectional view showing another example of the embodiment of the present invention.

FIG. 10 is a cross-sectional view showing another example of the embodiment of the present invention.

FIG. 11 is a cross-sectional view showing another example of the embodiment of the present invention.

FIG. 12 is a cross-sectional view showing another example of the embodiment of the present invention.

FIG. 13 is a cross-sectional view showing another example of the embodiment of the present invention.

FIG. 14 is a longitudinal sectional view showing an example of a conventional speaker device.

[Explanation of symbols]

1 speaker box, 1a left side plate, 1b right side plate, 1c front plate, 1d rear plate, 3a, 3b,
3c, 3d {speaker unit, 20a} left room, 2
0b ‥‥ RV, 21a, 21b ‥‥ sound emission direction changing sound path, 22 ‥‥ _{ducts, 22a, 22a 1, 22a 2} , 3
1a, 32a opening, 22b, 22c sound duct, 31, 32 wall

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akihiro Akiyama 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Kenji Tokushige 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (3)

[Claims] 1. A first box is provided on the left and right sides of the speaker box.
And the second speaker unit are fixed respectively, and first and second sound radiation direction changing sound paths for emitting sound from the front surfaces of the first and second speaker units to the front of the speaker box are provided. A speaker device, wherein sound from the back of the first and second speaker units is radiated forward of the speaker box by a bass reflex duct. 2. The speaker device according to claim 1, wherein an opening of the duct is provided outside an opening of the first and second sound radiation direction changing sound paths. 3. The speaker device according to claim 1, wherein the sound from the first and second sound paths and the sound from the duct are added and radiated to the outside of the speaker box. Speaker device.