JP2000050382A - Speaker system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To propose a speaker system small and light that reproduces low sound frequency components excellently by preventing a speaker box from being rocked. SOLUTION: The speaker system is provide with a squaker/woofer 3 that is fitted to a baffle board 21 on an upper side of a speaker box 20 and a tweeter 24 that is fitted to an upper part of the baffle board 21 on the upper side of the speaker box 20 via supports 23a, 23b and the sound from the squaker/ woofer 3 and the sound from the tweeter 24 are put together.

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 application to, for example, a small and lightweight speaker device.

[0002]

2. Description of the Related Art Generally, in a small and lightweight speaker device, an opening and a duct are provided in a baffle plate provided with a speaker, and an effective means for extending the low-frequency reproduction limit is provided from a rear surface of a diaphragm of the speaker. A bass reflex type (phase inversion type) speaker that inverts the phase of the sound and radiates it from the opening through the duct to the outside, strengthening the sound wave emitted from the speaker's diaphragm to the front, so that the bass range is not distorted. Devices are well known.

In such a phase inversion type speaker device, as shown in FIG. 6, a speaker 3 is fixed to a speaker sound emission hole 2a formed in a baffle plate 2 provided on a front surface of a speaker box 1.

As shown in FIG. 6, for example, the speaker 3 includes a ring-shaped magnet 4, a plate 5 and a yoke 6 mounted so as to sandwich the ring-shaped magnet 4.
And a magnetic gap 7 is formed between the inner peripheral side of the plate 5 and the center pole 6 a of the yoke 6. The frame of the speaker 3 is attached to the plate 5, and the diaphragm 1
An edge 9 is provided on the outer peripheral portion of the diaphragm 0, and the outer peripheral portion of the cone-shaped diaphragm 10 is held on the frame 8 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 on the center pole 6a of the plate 5 and the yoke 6.
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 acoustic signal from an input terminal 13 provided at a predetermined position outside the speaker box 1 is connected to a connection line 14.
The sound signal from the terminal 15 is supplied to the voice coil 12 via the tinsel wire 16.

[0007] Further, the speaker sound emission hole 2a of the baffle plate 2
A duct 18 having an opening 18a is provided on the same surface as the above, and the phase of the sound emitted from the back surface of the diaphragm 10 of the speaker 3 is inverted and radiated from the duct 18 to the outside of the speaker box 1. The bass range of the sound coming out from the front is expanded. Reference numeral 19 denotes a cap for preventing dust from entering.

As described above, by using a phase inversion type speaker device, the bass reproduction limit can be lowered as compared with the sealed type, and about 80% of the bass resonance frequency f ₀ of the speaker 3 can be obtained.
It is said that the low-frequency reproduction range can be extended to a certain extent.

In such a speaker device, the sound radiation force F ₁ due to the vibration of the diaphragm 10 of the speaker 3 is obtained by multiplying the effective mass M ₁ of the speaker 3 by the acceleration α _{1 at} which the diaphragm 10 moves, that is, F ₁ = It can be expressed as M ₁ α ₁ . To such sound radiation force F _1, the influence from the rear side of the reaction force -F ₁ toward the speaker box 1 of the vibration plate 10 is also markedly smaller the volume of the speaker box 1 speaker device is small and light The vibration in the diaphragm 10 causes the air in the speaker box 1 to repeatedly compress and expand, and this air acts as a force to return the diaphragm 10 to its original position. There was a problem that bass reproduction was hindered.

In view of the above, the present invention proposes a small and lightweight speaker device capable of preventing the speaker box from swinging and reproducing good bass sound.

[0011]

A speaker device according to the present invention comprises a speaker for middle and low-frequency sound, which is mounted upward on a baffle plate on the upper surface of a speaker box, and a supporter on the upper side of the baffle plate on the upper surface of the speaker box. And a loudspeaker attached through the loudspeaker, and synthesizes the sound from the middle and low-frequency speakers and the sound from the high-frequency speakers.

According to the present invention, since the speaker for middle / low-frequency sound is mounted upward on the baffle plate on the upper surface of the speaker box, even if sound is radiated from the speaker for middle / low-frequency sound, the reaction of this sound radiation force is performed. The force is pressed against the base (ground) and is canceled out, so that the speaker box does not swing, and even with a small and lightweight speaker device, the sound radiating power of the middle / low-range speaker is not impaired, and a good bass sound is obtained. Can be played.

According to the present invention, a treble speaker is provided above the baffle plate on the upper surface of the speaker box.
Good sound quality (frequency characteristics) because the sound from the high-pitched speaker and the sound from the low-pitched speaker are combined.
Can be obtained.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a speaker device according to the present invention will be described below with reference to FIGS. In FIG. 1, parts corresponding to those in FIG. 6 are denoted by the same reference numerals.

FIG. 1 is a perspective view of the speaker device of this embodiment. In the speaker device of FIG. 1, the speaker box 20 is formed in a vertical direction into a relatively thin and substantially rectangular parallelepiped shape with an ABS resin or the like, and a speaker sound emission hole 21a is formed in a baffle plate 21 provided on the upper surface of the speaker box. For example, the speaker 3 for middle and low-frequency sounds as shown in FIG.

In this case, the directivity of the sound radiation of the speaker 3 for middle and low frequency is omnidirectional in the horizontal plane direction, but in the vertical direction, the angle θ becomes large with respect to the central axis O of the speaker 3 in the vertical direction. 2A (in this case, the direction of the central axis O is θ = 0 °).
Is).

A duct 22 having an opening 22a is provided at a predetermined position on the front surface of the speaker box 20.
The phase of the sound emitted from the rear surface of the diaphragm 10 is inverted and radiated from the duct 22 to the outside of the speaker box 20 so as to widen the bass range of the sound.

In this embodiment, the arms 23a and 23b extend obliquely upward from the upper left and right corners of the front panel of the speaker box 20, respectively.
, And a rear open treble speaker 24 is fixed to the upper ends of the arms 23a and 23b toward the front. In this case, the same acoustic signal is supplied to the middle / low-pitched speaker 3 and the high-pitched speaker 24.

In this embodiment, when a person listens to the sound from this speaker device, the vertical directivity of the speaker 3 is changed as shown in FIG.
Assuming that θ = 45 ° in the curve a of B, the frequency characteristic of the rear open-type treble speaker 24 is as shown by the curve b in FIG. 2B.

In this case, when the sound from the speaker device is heard in the direction of θ = 45 ° in the vertical direction of the speaker 3, the frequency characteristic a from the middle and low sound speaker 3 and the rear open high sound speaker Thus, it is possible to listen to the sound having the frequency characteristic obtained by combining the frequency characteristic b with the frequency characteristic b from FIG.

In this case, when the direction in which a person listens to the sound is a vertical direction, for example, θ = 45 °, the frequency characteristic is attenuated by the directivity. It is not necessary to attenuate the acoustic signal using a choke coil or the like.

According to this embodiment, since the speaker 3 for middle and low frequency is mounted with the upward facing the baffle plate 21 on the upper surface of the speaker box 20, sound is emitted from the speaker 3 for middle and low frequency. The reaction force of this sound radiation force F ₁ -F ₁
Is suppressed by being pressed against the mounting table (ground), the speaker box 20 does not swing, and even with a small and lightweight speaker device, even if the radiation power of the sound of the middle and low-frequency speaker 3 is increased, the sound Radiation power is not impaired,
Powerful and good bass reproduction is possible.

Further, according to the present embodiment, the high-frequency speaker 24 is provided above the baffle plate 21 on the upper surface of the speaker box 20, and the sound from the high-frequency speaker 24 and the sound from the low-frequency speaker 3 are provided. Is synthesized, sound can be reproduced with good frequency characteristics even in a small and lightweight speaker device, and sound quality can be improved.

FIGS. 3, 4 and 5 show other examples of the embodiment of the present invention, respectively. FIGS. 3, 4 and 5 are the same as those in FIG. With a sign,
The detailed description is omitted.

In the example shown in FIG. 3, the arms 23a and 23b supporting the rear open-type treble speaker 24 shown in FIG. 1 are formed of a punching plate 23 having a high aperture ratio, and 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 in the example of FIG.

In the example shown in FIG. 4, a duct 22 having an opening 22a is provided at a predetermined position on the upper surface of a speaker box 20 on the same surface as a speaker sound emission hole 21a of a baffle plate 21. The sound emitted from the diaphragm 22 is inverted, radiated from the duct 22 to the outside of the speaker box 20, and the bass of the sound emitted from the front surface of the diaphragm 10 is widened. The example of FIG. 4 is otherwise the same as the example of FIG.

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

FIG. 5 shows an example of an arm 2 extending above the left and right corners on the upper side of the front panel of the speaker box 20.
3L and 23R are provided, and rear open treble speakers 24L and 24R are fixed to the upper ends of the arms 23L and 23R, respectively, facing the front.

In the example shown in FIG. 5, a stereo signal can be reproduced. A left signal L of the stereo signal is supplied to a treble speaker 24L, and a right signal R of the stereo signal is supplied to a treble speaker 24R. The left and right signals R and R of the stereo signal are supplied to the middle / low-frequency speaker 3.

In the example shown in FIG. 5, an amplifier is built in the speaker box 20. Reference numeral 25 denotes a power switch knob of the amplifier, and reference numeral 26 denotes a volume variable knob. In the example of FIG. 5, the rest is configured similarly to the example of FIG.

In the example of FIG. 5, it can be easily understood that the reproduced sound of the stereo signal is obtained and the same operation and effect as in the example of FIG. 1 are obtained. In the example of FIG. 5,
Since the amplifier is built in the speaker box 20, there is an advantage that the speaker box 20 is further stabilized in an installed state.

In the above example, the arms 23a and 23b and the punching plate 23 having a high aperture ratio are used to support the treble speaker 24, but a wire mesh may be used instead.

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.

[0035]

According to the present invention, since the speaker for middle / low-frequency sound is mounted with the upper side facing the baffle plate on the upper surface of the speaker box, even if sound is emitted from the speaker for middle / low-frequency sound, pressed against the base reaction force -F ₁ radiation force F ₁ the mounting (ground) are offset, without the speaker box swings, in the speaker device small and lightweight, the radiation of the inside sound woofer Even if the power is increased, the radiation power of sound is not impaired, and there is an advantage that powerful and good bass reproduction can be performed.

According to the present invention, a high-frequency speaker is provided above the baffle plate on the upper surface of the speaker box, and the sound from the high-frequency speaker and the sound from the low-frequency speaker are synthesized. Therefore, there is an advantage that even a small and lightweight speaker device can reproduce sound having good frequency characteristics and improve sound quality.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an embodiment of a speaker device of the present invention.

FIG. 2 is a diagram for describing the present invention.

FIG. 3 is a perspective view showing another example of the embodiment of the present invention.

FIG. 4 is a perspective view showing another example of the embodiment of the present invention.

FIG. 5 is a perspective view showing another example of the embodiment of the present invention.

FIG. 6 is a cross-sectional view illustrating an example of a conventional speaker device.

[Explanation of symbols]

3 ‥‥ middle and low frequency speaker, 20 ‥‥ speaker box,
21 baffle plate, 21a speaker sound emission hole, 22
{Duct, 23} punching plate, 23a, 23b}
‥ Arm, 24 ‥‥ Speaker for treble

Claims (3)

[Claims] 1. A low-mid speaker mounted upward on a baffle plate on an upper surface of a speaker box, and a high-frequency speaker mounted via a support above a baffle plate on an upper surface of the speaker box. A speaker device comprising: a sound from the speaker for middle and low sounds and a sound from the speaker for high sounds. 2. The speaker device according to claim 1, wherein the treble speaker is of a rear open type. 3. The speaker device according to claim 1, wherein the support is an arm, a punching plate having a high aperture ratio, or a wire mesh.