JP2001119778A - Sound radiating speaker box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sound radiation speaker box that provides a sound effect very close to the natural sound without directivity. SOLUTION: An middle sound frequency resonant board 51 and a low sound frequency resonant board 52 are adhered to the front face of a box 10, and a high sound frequency sound source 20, a middle sound frequency sound source 30 and a high sound frequency sound source 40 are directly or indirectly fixed to a support pillar 13 stood upright in the inside of the sound box 10. In the high sound frequency sound source 20, a voice coil 21 excited in a magnetic circuit is housed in an exciting box 22 and the voice coil 21 is fixed to a high sound frequency resonant board 53 adhered to the front face of the exciting box 22. The respective voice coils 31, 41 of the middle sound frequency sound source 30 and the low sound frequency sound source 40 are fixed to the middle sound frequency resonant board 51 and the low sound frequency resonant board 52, respectively. The sound box 10 acts like an instrument by the vibration of the resonant boards 51, 52, the surface vibration of the sound box 10 and the air vibration in the inside of the sound box 10, and an acoustic effect with full of presence very close to natural sound can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker which reproduces sound very close to natural sound by directly exciting a sound board constituting a part of a sound cylinder.

[0002]

2. Description of the Related Art A loudspeaker used in audio equipment radiates vibration of a diaphragm such as a cone directly or in a horn manner by a driving method such as a conductive type, and converts electric energy into acoustic energy. . Therefore, the sound wave emitted from the speaker has directivity, and the listening position is specified in relation to the speaker. Further, in order to increase the width of the reproduction frequency band, a composite speaker system combining high, middle, and low sound ranges is provided. Sound with flat frequency characteristics can be obtained by combining speakers for each sound range, but sound waves obtained from diaphragms such as cones are air sounds, which are still uncomfortable compared to natural sounds, and are particularly sensitive to sound quality. Not enough to satisfy the demands of enthusiasts and music professionals. Dedicated speakers are combined for high, middle, and low frequencies, but the sound quality heard from each speaker is slightly different. Absent.

[0003]

SUMMARY OF THE INVENTION By the way, the present inventor has developed a resonance box for vibration perception training for the hearing impaired in order to have them feel the world of sound.
This is introduced as JP-A-10-277081. In the proposed resonance box for vibration perception training, as shown in FIG. 1, a magnetic circuit 3 is fixed to a bottom plate 2 of a vibration box main body 1 having a hollow inside, and a voice coil 4 is inserted into the magnetic circuit 3. ing. One end of the bottom plate 2 protrudes from the vibration box main body 1, and the signal terminal 5 connected to the outside is connected to the bottom plate 2.
Are provided on the protrusions. The voice coil 4 is fixed to the front plate 6 so as to directly transmit vibration to the vibration box main body 1. When sound information is externally input to the magnetic circuit 3 via the signal terminal 5, the voice coil 4 is excited by the magnetic circuit 3 according to the input signal, and the front plate 6 of the vibration box main body 1 is excited.
Vibrates directly. The vibration of the front plate 6 is perceived as vibration by a hand or the like, and is simultaneously radiated as sound waves. This sound wave is radiated as solid sound due to the vibration of the resonance box, and the resonance box itself functions as a kind of musical instrument, so that a sound very close to natural sound is obtained.

[0004]

SUMMARY OF THE INVENTION The present invention utilizes the advantages of a vibration box proposed in the prior application to provide a low frequency range, a mid frequency range,
Each sound source for the treble range is incorporated into one sound cylinder, and the low sound,
It is an object of the present invention to provide a speaker in which a middle sound and a high sound are continuous with substantially the same sound quality, and which can reproduce a high-quality sound which has not existed conventionally.

[0005] In order to achieve the object, the speaker of the present invention directly or indirectly attaches a soundboard having a middle-range sound board and a low-range soundboard attached to the front surface thereof, and a support standing upright inside the soundbody. , A high-range sound source, a middle-range sound source, and a low-range sound source. The high-frequency sound source has a structure in which a voice coil excited by a magnetic circuit is built in a vibration box, and the voice coil is fixed to a high-range soundboard attached to the front of the vibration box. The voice coils of the mid-range sound source and the low-range sound source are fixed to the mid-range sound board and the low-range sound board, respectively.

[0006] In order to obtain continuous sound, it is preferable that the mid-range sound board and the low-range sound board are attached to the front surface of the sound cylinder while being connected to each other. The resonance of the mid-range sound board and the low-range sound board can be suppressed by abutting a pin projecting forward from a spring provided on the support to the resonance point of the middle-range sound board and the low-range sound board. . The resonance of the treble sound board can also be suppressed by abutting pins protruding from springs having both ends fixed to both front edges of the vibrating box at the resonance point of the treble sound board. A vibration damping tape may be used to suppress resonance of the soundboard. It is also possible to attach a soundboard to the side of the sound cylinder. In this case, the use of a corrugated side soundboard can prevent standing waves in the sound cylinder. Since a relatively thin plate material is used as the side sound board, an appropriate reinforcing member is incorporated inside the sound body.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A loudspeaker according to the present invention has a high-range sound source 20, a middle-range sound source 30, and a low-range sound source 40, for example, as shown in FIG.
As each of the sound sources 20, 30, and 40, a normal sound source in which a voice coil is inserted into a magnetic circuit is used. The sound cylinder 10
A mid-range sound board 51 and a low-range sound board 52 are provided on the front surface of the pedestal 11 and supported by supporting legs 12 erected on the pedestal 11. The pedestal 11 further has a pair of columns 13 erected. The support 13 extends vertically inside the sound cylinder 10, and has an upper end fixed to a top plate 14 of the sound cylinder 10.

The high-frequency sound source 20 has a voice coil 21 fixed to the support column 13 and fixed to a high-frequency sound board 53 in a vibration box 22. Midrange sound source 30
Is fixed to a support plate 13 or a fixed plate 17 (FIG. 4a) attached to a pair of supports 13, 13, and a voice coil 31 is fixed to a mid-range sound board 51. The bass sound source 40 is also fixed to the column 13 or the fixed plate 17, and the voice coil 41 is fixed to the bass sound plate 52. Note that a plurality of low-range sound sources 40 are arranged as necessary in order to reproduce a heavy sound quality in a low-frequency range. As described above, since each of the sound sources 20, 30, and 40, which are vibration sources, is fixed to the column 13 serving as a counterweight,
Vibrations are efficiently transmitted from the sound sources 20, 30, 40 to the sound boards 51, 52, 53. In addition, since the pillars 13 are arranged inside the sound cylinder 10, the side surfaces of the sound cylinder 10 are opened, and the degree of freedom in designing the speaker is improved.

A mid-range sound source 30 and a low-range sound source 40
Transmits the sound wave vibration directly to the mid-range sound board 51 and the low-range sound board 52 via the voice coil 31 and the voice coil 41, respectively, and outputs the mid-range sound board 51 and the low-range sound board 52.
A sound wave is emitted by the vibration of. In the treble sound source 20, the treble sound board 53 is vibrated via the voice coil 21. The treble sound board 53 is attached to the front surface of the excitation box 22 (FIG. 4B) constituting the treble sound source 20.

As described above, the sound board 51 constituting the sound cylinder 10,
Since sound waves are emitted by the vibrations of the sound board 52 and the high-pitched sound board 53, there is no discontinuity from the low pitch to the high pitch, and the surface vibration of the sound cylinder 10 itself and the cavity vibration inside the sound cylinder 10 are combined. The sound cylinder 10 functions as a kind of musical instrument, and reproduces sound quality very close to nature. In addition, when the same material is used for the sound boards 51, 52, and 53, sound waves of the same sound quality are emitted from the low range to the high range. For the soundboards 51 to 53, a material having a large specific dynamic Young's modulus, a high sound propagation speed, a small internal loss, and a good sound is used because an electric signal containing sound information is converted into vibration. . For example, a wooden board,
There are a ceramic plate, a glass plate, a hard plastic, a metal plate and the like. In the case of a wooden soundboard, it is preferable to use a chemically treated board to reduce swelling due to moisture and obtain stable sound quality. This type of chemical treatment includes resorcinol formaldehyde treatment, low molecular weight phenol impregnation treatment and the like. By the chemical treatment, the specific dynamic Young's modulus of the sound boards 51 to 53 is improved and the internal loss is reduced, so that good sound quality is obtained. When a metal plate or a woven fabric is used or attached to the sound boards 51 and 52, the sound cylinder 10 can be vibrated with a unique tone. In order to reduce the natural frequency of the low-range sound board 52, it is preferable to use a thinner plate material than the middle-range sound board 51.

It is also possible to use the side wall of the sound cylinder 10 as a sound body. In this case, a soundboard made of the same material as the soundboards 51 and 52 is attached to the side of the sound cylinder 10. As the sound board at the side, a sound board 54 formed into a wave shape toward the inside as shown in FIG. 3 is preferable. The side sound boards 54 include the sound boards 51 and 5.
2 or inclined side plates 55, 55 having one side fixed to the back plate 15.
It is provided between. Since the corrugated side soundboard 54 has no parallel surface that emphasizes sound waves of a specific frequency, the corrugated shape increases the strength due to the corrugated shape and exhibits an effect of preventing a standing wave generated in the sound cylinder 10.

Since the side sound board 54 and the inclined side board 55 are made of a thin plate like the sound boards 51 and 52, they are preferably reinforced. As the reinforcing means, for example, the sound cylinder 10
The reinforcing ribs 56 extending in the vertical direction are applied to the corrugated portions of the side sound boards 54 from the inside, and the reinforcing ribs 56 are supported by one or more beams 57 extending in the horizontal direction at appropriate positions in the vertical direction of the sound cylinder 10. A structure is adopted. When the sound coils 51 and 52 are directly vibrated by the voice coils 31 and 41, the sound boards 51 and 52 may resonate due to natural vibration, and abnormal sounds such as chatter may be emitted with a large amplitude. Such resonance is suppressed by absorbing the vibration of the sound boards 51 and 52 with an elastic body or a vibration damping tape or the like.

FIG. 4 shows a specific vibration damping structure using an elastic body.
(A). First, the resonance points of the soundboards 51 and 52 are specified, and the pins 13 and 13 of the columns 13 and 13 are so arranged that the pin 62 provided at the center of the spring 61 abuts on the resonance points of the soundboards 51 and 52 via the cushioning material 63. The spring 61 is inserted between them.
The resonance of the sound boards 51 and 52 is caused by the spring 6 via the pin 62.
1 and is absorbed as elastic deformation of the spring 61, so that a large amplitude caused by resonance is reduced. FIG.
(A) illustrates a leaf spring as the spring 61, but a coil spring can be used instead of the leaf spring. Reference numeral 17 denotes a fixing plate for mounting the mid-range sound source 30 and the low-range sound source 40.

A similar vibration damping structure can be incorporated into the high-frequency sound source 20. That is, as shown in FIG. 4B, both ends of a spring 65 straddling the high-range sound board 53 are fixed to both front edges of the vibration box 22. A pin 66 is provided at the center of the spring 65, and the tip of the pin 66 abuts on the resonance point of the high-range soundboard 53 via the buffer 67. Exciting box 22 of high-frequency sound source 20
Is relatively small, the resonance of the high-pitched sound board 53 can be suppressed even by a simple structure in which a vibration damping tape is attached to the resonance point of the high-pitched sound board 53 and its vicinity. A similar damping structure can be incorporated in the side sound board 54. In this case, means for interposing an elastic body, a damping tape, or the like between the side sound board 54 and the reinforcing rib 56 is employed.

[0015]

As described above, the sound-body radiating speaker of the present invention is a system in which sound waves are radiated as solid sound by surface vibration of the sound-body and air vibration inside the sound-body, so that one type of sound-emitting speaker is provided. It works as a musical instrument and reproduces a very natural sound and clear sound in a wide range from the low range to the high range. In addition, the wide directivity and high radiation efficiency ease the viewer's positional relationship with the speaker, allowing the user to enjoy sound with excellent sound quality from any location, and the viewer's impression is realistic. Will be high.

[Brief description of the drawings]

FIG. 1 The vibration box proposed earlier by the present inventors

FIG. 2 is a side sectional view showing the internal structure of the speaker according to the present invention.

FIGS. 3A and 3B are a plan cross-sectional view of a speaker in which a side sound board is attached to a side portion of a sound body and a perspective view of the side sound board seen from the inside of the sound body; FIGS.

FIGS. 4A and 4B are perspective views of a vibration damping mechanism when a midrange sound board and a low frequency soundboard are viewed from the inside of a sound cylinder, and a perspective view of a vibration box provided with the vibration damping mechanism; FIGS.

[Explanation of symbols]

10: sound body 11: pedestal 12: support leg 14: top plate 15: back plate 17: fixed plate 20: treble sound source 21: voice coil 22:
Exciting box 30: Mid-range sound source 31: Voice coil 40: Low-range sound source 41: Voice coil 51: Mid-range sound board 52: Low-range sound board 53:
High range soundboard 54: Side soundboard 55: Inclined sideboard
56: Reinforcement rib 57: Beam 61, 65: Spring 62, 66: Pin 6
3,67: cushioning material

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[Procedure amendment]

[Submission date] October 22, 1999 (1999.10.
22)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

FIG. 2

Claims (5)

[Claims] 1. A sound body in which a mid-range sound board and a low-range sound board are attached to the front surface, a high-range sound source directly or indirectly fixed to a support standing inside the sound body, and a mid-range sound range. The sound source for the high range has a voice coil that is excited by a magnetic circuit built into the excitation box, and the voice coil is fixed to the sound board for the high range attached to the front of the excitation box. Sound source characterized by having a voice coil excited by a magnetic circuit fixed to the mid-range sound board and the low-range sound board, respectively. Type speaker. 2. The sound-body radiating speaker according to claim 1, wherein the middle-range sound board and the low-range sound board are connected to each other and attached to the front surface of the sound body. 3. The sound-body radiating speaker according to claim 1, wherein a pin protruding forward from a spring provided on the support abuts on a resonance point of the mid-range sound board and the low-range sound board. 4. The sound-body radiating speaker according to claim 1, wherein pins protruding from springs having both ends fixed to both front edges of the vibrating box are in contact with a resonance point of the high-frequency soundboard. 5. The sound-body radiating speaker according to claim 1, wherein a wave-shaped side sound board is attached to a side surface of the sound-body.