JP3219058B2 - Speaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a speaker,
In particular, for example, the present invention relates to a bass speaker used as a woofer of a 3D system.

[0002]

2. Description of the Related Art As a conventional speaker, a speaker called a bookshelf type is generally used. In this speaker, a dynamic speaker unit is attached to a housing and sound is emitted from the front of the speaker unit. At this time, sound is emitted by vibrating the diaphragm of the speaker unit, but sound is emitted not only from the front side but also from the rear side of the diaphragm. Since the sound emitted from the front of the speaker unit and the sound emitted from the back are opposite in phase, the sound is emitted from the rear of the speaker unit by the housing so that these sounds are not canceled out. The sound is cut off.

However, since the housing vibrates due to the sound emitted from the rear side of the speaker unit, in order to suppress such vibration of the housing, the housing may be made of a material having high rigidity, or a reinforcing material may be used. The vibration of the housing is suppressed by suppressing the vibration of the housing or by inserting a sound absorbing material in the housing. Thus, the vibration of the housing is suppressed, the sound emitted from the rear side of the speaker unit is sufficiently blocked, and only the sound emitted from the front surface of the speaker unit is transmitted to the outside.

[0004]

In such a bookshelf type speaker, a large-sized speaker unit is required in order to produce a speaker for a low sound such as a woofer. In addition, in order to obtain sufficient bass, it is necessary to manufacture a housing having a large volume. Furthermore, in order to use the sound emitted from the front of the speaker unit,
The sound obtained has directivity.

[0005] It is, therefore, a primary object of the present invention to provide a compact, omni-directional speaker.

[0006]

The present invention includes a speaker unit and a housing to which the speaker unit is attached. The speaker unit faces a mounting surface on which the housing is installed.
Once positioned, the interior surface of the housing
The space defined by the back of the peaker unit is a closed space
And the space in front of the speaker unit is a closed space.
Yes, the housing emits sound to the outside by vibrating along with the vibration of the speaker unit,
It is a speaker.

[0007] The reciprocating vibration of the vibrating body of the speaker unit causes respiratory vibration so that the housing expands and contracts. Due to the respiratory vibration of the housing, a non-directional spherical wave is emitted outside the housing. The breathing vibration of the housing due to the reciprocating vibration of the speaker unit is excited by transmitting the pressure due to the vibration of the speaker unit to the air in the housing and further transmitting the pressure to the housing. Therefore, in order for the housing to efficiently breathe and vibrate, the smaller the volume of the housing is, the smaller the speaker can be. In addition, in order to cause the housing to breathe and vibrate efficiently, the speaker unit is mounted facing an enclosed space in the housing . By housing the speaker unit in a small housing, the resonance frequency of the speaker can be increased, and a sound having a frequency equal to or lower than the resonance frequency can be reproduced. By arranging the speaker unit on the floor side, sound emitted from the speaker unit toward the outside of the housing can be blocked, and only sound due to respiratory vibration of the housing can be emitted.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0009]

FIG. 1 is a perspective view showing an example of a speaker according to the present invention. The speaker 10 includes a housing 12 having an opening on one side. The housing 12 is, for example, vertically, horizontally,
The height dimensions can be approximately cubic, each 10 cm. In the speaker 10 shown in FIG. 1, the housing 12 is not a complete cube, but has a rounded portion corresponding to a ridgeline of the cube, and has a curved surface between the flat portions. Case 12
Is formed, for example, of wood.

As shown in FIG. 2, a plate member 14 having a through hole formed in the center is disposed in the opening of the housing 12. Then, the speaker unit 16 is attached to a central portion of the through-hole of the plate member 14. Speaker unit 1
As 6, for example, a dynamic speaker unit can be used. In this case, the speaker unit 1
The speaker unit 16 is attached to the plate member 14 such that the front surface of the speaker unit 6 is disposed toward the outside of the housing 12. Therefore, the space formed by the housing 12, the plate 14, and the speaker unit 16 is a closed space.

When this speaker 10 is used, the housing 1
The speaker 10 is installed so that the opening of the second unit, that is, the direction in which the speaker unit 16 is attached is on the floor side. Therefore, the sound emitted from the front surface of the speaker unit 16 is emitted to the space closed by the floor and the end of the housing 12, and does not come out of the housing 12. That is, since the direct sound from the speaker unit 16 does not come out, unnecessary directional sound pressure can be removed. In the speaker 10, pressure is transmitted to the air in the housing 12 by reciprocating vibration of the vibrating body of the speaker unit 12, and the pressure causes the housing 12 to perform respiratory vibration. Due to the respiratory vibration of the housing 12, a spherical wave is emitted to the outside of the housing 12.

In such a loudspeaker 10, since the housing 12 respires due to the reciprocating vibration of the vibrating body of the speaker unit 16, the omnidirectional spherical wave, which is ideal for the loudspeaker, is directed toward the outside of the housing 12. Can be formed. And, as shown in FIG. 1, the height, width and height are 10c.
Also in the speaker 10 using the m case 12, a bass sound that can be used as a woofer could be reproduced. As described above, it is possible to provide a small omnidirectional speaker as compared with a conventional speaker.

Further, the resonance frequency of the speaker 10 can be increased by causing the housing 12 to perform respiratory vibration. Loudspeakers have a characteristic that the tracking performance is poor for signals having a frequency higher than the resonance frequency, and that when a signal having a frequency higher than the resonance frequency of the speaker is input, the movement of the vibrator is delayed with respect to the input signal. . Therefore, there is a disadvantage that sound having a frequency higher than the resonance frequency is not faithfully reproduced. However, according to the speaker 10 of the present invention, the resonance frequency is higher than that of the speaker using the direct sound from the speaker unit, so that the followability to the input signal can be improved.

In order to cause the housing 12 to breathe and vibrate in this manner, in the speaker 10, the housing 12 is provided with a structure for suppressing vibration of the housing 12, for example, a housing reinforcing member or a sound absorbing material. This is achieved by not providing inside the body 12. However, in order to adjust the degree of vibration of the housing 12, a certain amount of housing reinforcing member or sound absorbing material may be provided inside the housing 12.
It is preferable to provide them to such an extent that they do not hinder the respiratory oscillations, that is, to such a degree that the respiratory oscillations are not partially distorted.

[0015] The material of the housing 12 is not limited to wood, depending on the desired frequency, it is possible to use rubber, plastic, resin, ceramic, glass, a material such as metal. The shape of the housing 12 may be a truncated pyramid as shown in FIG. 3 , or may be an arbitrary shape such as a pyramid, a cone, a truncated cone, or a hemisphere. Further, in order to emphasize the bass, a small port that opens outward from the sealed space of the housing 12 may be formed.
In order to cause the housing 12 to perform respiratory vibration by reciprocating vibration of the vibrating body of the speaker unit 16, it is preferable that the inside of the housing 12 be a closed space.

[0016]

According to the present invention, a spherical wave which is ideal for a speaker can be obtained, and a compact and non-directional speaker can be obtained. Moreover, since the sound is emitted not by the direct sound from the speaker unit but by the respiratory vibration of the housing, the sound pressure does not increase even if the sound is loud, and a comfortable sound can be obtained. Further, the resonance frequency of the loudspeaker can be increased, and a loudspeaker having good tracking performance for an input signal can be obtained.

[Brief description of the drawings]

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

FIG. 2 is an illustrative sectional view of the speaker shown in FIG. 1;

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

[Explanation of symbols]

 Reference Signs List 10 speaker 12 housing 14 plate material 16 speaker unit

Claims (1)

(57) [Claims] 1. A speaker unit comprising: a speaker unit; and a housing to which the speaker unit is attached, wherein the speaker unit is mounted on an installation surface on which the housing is installed.
Disposed headed, in the interior of the housing, wherein the inner surface of the casing speaker
The space defined by the back of the unit is a closed space
The speaker according to claim 1 , wherein a space in front of the speaker unit is a closed space, and the housing emits sound to the outside by vibrating along with the vibration of the speaker unit.