JP2000165974A - Speaker system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker system with an excellent acoustic characteristic where an acoustic tube is placed on the front face of a speaker unit used for a video device or the like such as a television receiver. SOLUTION: The speaker system is provided wit a speaker unit 1, an opening 15 that is formed nearly to be a rectangle and is coupled with a front face of the speaker unit 1, and an acoustic tube 13 having an inner face through which a smooth air flow from the speaker unit 1 toward the opening 15 is obtained and a rib 16 extended in a tubular direction of the tube 13 on the inner wall of the tube 13. In this way, a speaker system is realized where a low reproduction frequency limit is extended, sound is more naturally reproduced with low distortion while suppressing production of abnormal sound and a flat sound frequency characteristic is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device having an acoustic tube for guiding sound waves in front of a speaker used for video equipment such as a television receiver and various audio equipment such as automobiles, information and communications. It is.

[0002]

2. Description of the Related Art A speaker device in which an acoustic tube is connected to the front of a speaker unit and a sound wave generated from the speaker unit is guided to the opening of the acoustic tube has a higher output sound pressure than a case where no acoustic tube is used. It is advantageous in that sound is transmitted in a specific direction, and is often used.

FIGS. 8 to 10 show a conventional speaker device.
This will be described below. FIG. 8 is an exploded perspective view of a conventional speaker device, FIG. 9 is a cross-sectional view of the sound tube, and FIG. 10 is a structural cross-sectional view of a television receiver incorporating the speaker device.

First, a speaker device in a television receiver will be described.
Is an acoustic tube opening, 2 is an acoustic tube coupled to the front of the speaker unit 1 and forms a speaker device with the speaker unit 1, 10 is a television cabinet, 11 is a cathode ray tube, and 12 is a back cabinet.

[0005] The operation of a television receiver having a built-in speaker device constructed as described above will be described below.

[0006] Sound waves emitted from the speaker unit 1 pass through an acoustic tube 2 having an elongated, substantially rectangular shape with an opening 5 disposed on the front surface thereof. By taking the shape along the cabinet 10 and the cathode ray tube 11, the sound wave is guided to the front and emitted from the opening 5 of the narrow acoustic tube 2, thereby emitting the sound wave to the front of the television receiver. The speaker device contributes to downsizing and slimming of the television receiver.

Next, the details of the speaker device comprising the speaker unit 1 and the acoustic tube 2 will be described. 1 is a speaker unit for generating sound waves, 2 is an acoustic tube for guiding the sound waves generated from the speaker unit 1, Reference numeral 3 denotes a sound absorbing chamber formed inside the acoustic tube 2.

Reference numeral 4 denotes a sound path through which sound waves pass through the inside of the acoustic tube 2, and reference numeral 5 denotes an opening of the acoustic tube 2 which emits sound waves. Reference numeral 6 denotes a speaker unit mounting screw for connecting and fixing the acoustic tube 2 and the speaker unit 1, reference numeral 7 denotes a sound absorbing room cover for closing the sound absorbing room 3, and reference numeral 8 denotes a sound absorbing room cover mounting screw for fixing the sound absorbing room cover 7. Reference numeral 9 denotes an outer wall rib for reinforcing the acoustic tube 2.

The operation of the conventional speaker device configured as described above will be described below. First, when an electric signal is applied to the speaker unit 1, a sound wave is generated, and the sound wave passes through the sound path 4 by the acoustic tube 2 coupled to the front surface of the speaker unit 1, is guided to the sound path 4, and is sounded on the front surface. It is discharged from the opening 5 of the tube 2.

However, the sound wave generated by the standing wave generated at the length of the acoustic tube 2 resonates and is distorted, and the acoustic impedance greatly changes at the opening 5 of the acoustic tube 2. Since the standing wave is increased by being reflected inside, the sound pressure frequency characteristic has a severely disturbed peak dip.

However, it is possible to produce a flat sound pressure frequency characteristic by absorbing and controlling the standing wave generated inside the acoustic tube 2 by the sound absorbing chamber 3 provided inside the acoustic tube 2. At the same time, in order to maintain the sound absorbing effect of the sound absorbing chamber 3, the sound absorbing chamber is sealed with the sound absorbing chamber cover 7 and the sound absorbing chamber cover attaching screw 8, whereby natural sound reproduction is possible even in the speaker device having the elongated acoustic tube 2. And had

[0012]

However, in the above-described conventional configuration, the inside of the acoustic tube 2 has a smooth inner wall surface so that sound waves can easily pass through. This was also a factor of increasing harmonic distortion.

The present invention solves the above-mentioned problems, and provides an excellent speaker device which can realize more natural sound reproduction with low distortion and generation of abnormal sound and flat and flat sound pressure frequency characteristics. It is intended for.

[0014]

In order to solve the above-mentioned problems, a speaker device according to the present invention comprises at least a speaker unit, an acoustic tube having an inner surface with a smooth air flow coupled to a front surface of the speaker unit, Since it is composed of the inner wall of the acoustic tube and the ribs provided along the direction of the acoustic tube, the lower limit of the reproduction frequency in the low frequency range is achieved, and low distortion and occurrence of abnormal sound are also achieved. An object of the present invention is to provide an excellent speaker device capable of realizing suppressed more natural sound reproduction and flat and flat sound pressure frequency characteristics.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to an acoustic tube having at least a speaker unit, an inner surface having a smooth air flow coupled to a front surface of the speaker unit, and an acoustic tube of the acoustic tube. Since the inner wall is composed of ribs provided along the direction of the acoustic tube, the lower limit of the reproduction frequency in the low frequency range is achieved, and low distortion and the occurrence of abnormal sounds are suppressed. An object of the present invention is to provide an excellent loudspeaker device capable of realizing excellent sound reproduction and flat and flat sound pressure frequency characteristics.

According to a second aspect of the present invention, there is provided a plurality of ribs according to the first aspect, and it is possible to provide a speaker device capable of controlling resonance inside an acoustic tube. Things.

According to a third aspect of the present invention, the opening of the acoustic tube according to the first aspect has a substantially rectangular shape and is mounted between a cabinet of a television receiver and a cathode ray tube. In addition to maintaining the sound tube strength by the ribs provided on the inner wall surface, the sound tube's cross-sectional area in the space between the cabinet and the cathode ray tube is enlarged and maximized as the sound tube volume to achieve a higher sound pressure level. Is obtained.

According to a fourth aspect of the present invention, the rib on the inner wall of the acoustic tube according to the first aspect is provided in a spiral shape in the direction of the acoustic tube. With such a shape, the speed of the sound wave passing through the sound path can be increased, and a higher output sound pressure level can be obtained.

An embodiment of the speaker device according to the present invention will be described below with reference to FIGS. In the description, the same parts as those of the related art are given the same part numbers, and the description will be omitted.

(Embodiment 1) FIG. 1 is an exploded perspective view of an embodiment of a speaker device of the present invention, FIG. 2 is a cross-sectional view of an acoustic tube of the speaker device, and FIG. It is a frequency characteristic figure.

Only the differences between the present invention and the prior art will be described with reference to the same drawing. Reference numeral 13 denotes an acoustic tube mounted on the front surface of the speaker unit 1, and reference numeral 14 denotes a sound path through which sound waves inside the acoustic tube 13 pass. And 15 is an acoustic tube 13 for emitting sound waves
The sound path 14 has an unobstructed inner surface with a small change in the two-dimensional shape so that the flow of air toward the opening 15 of the acoustic tube 13 is smooth.

Reference numeral 16 denotes a rib extending in the direction of the acoustic tube 13 in which the sound wave travels.

In the present embodiment, the ribs 16 are provided on the inner wall of the acoustic tube 13 mounted on the front of the speaker unit 1 so that, for example, the cabinet of the television receiver as described in the prior art of FIG. When the acoustic tube 13 is disposed between the cathode ray tube 10 and the cathode ray tube 11, the outer diameter of the acoustic tube 13 can be increased for the space due to the projection of the conventional rib 9, the sound path 14 through which the sound wave passes is enlarged, and the space is limited. Among them, a high output sound pressure level can be obtained.
Further, since the ribs 16 are provided in the direction in which the sound flows smoothly toward the opening 15 of the acoustic tube 13 (the direction of the acoustic tube 13), deformation of the acoustic tube 13 due to the pressure of the acoustic wave is also conventional. It can be suppressed similarly to the rib.

Further, it has been confirmed that the rib 16 can extend the low-frequency reproduction frequency limit and provide an excellent speaker device capable of realizing more natural sound reproduction and flat and flat sound pressure frequency characteristics.

FIG. 3 shows the sound pressure frequency characteristic and the second harmonic distortion characteristic of the conventional speaker device and the speaker device of the present embodiment. The sound pressure frequency characteristic 23 of the speaker device of the present embodiment is shown. Shows that the high pressure frequency characteristic is higher than the sound pressure frequency characteristic 24 of the conventional speaker device over the entire band, and that the extended low frequency range of the sound pressure frequency characteristic can be reproduced. Further, it was confirmed that a flat sound pressure frequency characteristic with a small peak dip was realized also in the sound pressure frequency characteristic of the middle sound range. Note that the outer diameter of the acoustic tube 13 is increased by the ribs 16,
By increasing the volume of the acoustic tube, a high sound pressure frequency characteristic can be obtained. By providing the rib 16 extending in the tube direction of the acoustic tube 13, a flat and flat sound pressure frequency characteristic can be obtained for low-frequency reproduction. It is determined that it has been obtained.

Further, the second harmonic distortion 25 of the speaker device in which the ribs 16 are provided on the acoustic tube 13 of the present embodiment is lower than that of the conventional speaker device 26, and the second harmonic distortion is lower and the linearity is higher. Is apparent from FIG.

(Embodiment 2) Another embodiment of the speaker device of the present invention will be described with reference to FIG.

FIG. 4 is a cross-sectional view of an acoustic tube which is a main part of another speaker device of the present invention. Only the differences between the first embodiment and the present embodiment will be described with reference to the figure. Reference numeral 17 denotes another rib provided on the inner wall of the acoustic tube 13 so as to extend in the direction of the acoustic tube similarly to the rib 16.

In the present embodiment, by increasing the number of ribs arranged inside the acoustic tube 13, the positions of the plurality of ribs 16 and 17 are appropriately set, and the resonance generated inside the acoustic tube 13 is set. , And the flow of the sound wave can also be controlled to realize a flatter and flatter sound pressure frequency characteristic.

(Embodiment 3) Another embodiment of the speaker device of the present invention will be described with reference to FIG.

FIG. 5 is a cross-sectional view of an acoustic tube which is a main part of another speaker device of the present invention. Only the differences between the first embodiment and the present embodiment will be described with reference to the figure. Reference numeral 18 denotes a horn-shaped acoustic tube, 19 denotes an opening of the acoustic tube 18, and 20 denotes an inside of the acoustic tube 18. It is a rib provided in.

In the present embodiment, by forming the shape of the acoustic tube 18 into a cylindrical shape, it is possible to realize a higher acoustic tube strength that cannot be achieved with the substantially rectangular acoustic tube 13 of the first embodiment. Therefore, it is possible to reproduce extended bass sound without attenuation of the bass range.

(Embodiment 4) Another embodiment of the speaker device of the present invention will be described with reference to FIG.

FIG. 6 is a cross-sectional view of an acoustic tube which is a main part of another speaker device of the present invention. Only the differences between the third embodiment and the present embodiment will be described with reference to the same drawing. Reference numeral 21 denotes another rib disposed on the inner wall of the acoustic tube 18.

In the present embodiment, the shape of the acoustic tube 18 is formed in a horn shape, which is a cylindrical modification, similarly to the third embodiment, and the ribs 2 are formed on the inner wall in the tube direction of the acoustic tube 18.
Since 0 and 21 are provided, it is possible to control the laminar flow generated when the sound wave inside the acoustic tube 18 passes, and to achieve a more natural sound reproduction and flatness with low distortion and suppressed generation of abnormal sound. Thus, a flat sound pressure frequency characteristic can be realized.

(Embodiment 5) Another embodiment of the speaker device of the present invention will be described with reference to FIG.

FIG. 7 is a cross-sectional view of an acoustic tube which is a main part of another speaker device of the present invention. Only the differences between the third embodiment and the present embodiment will be described with reference to the figure. Reference numeral 22 denotes a spiral rib formed on the wall of the acoustic tube 18 and directed toward the open end 23.

In the present embodiment, the shape of the acoustic tube 18 is horn-like as in the third embodiment, and the spiral ribs 22 formed on the inner wall of the acoustic tube 18 reduce the passing speed of the sound wave inside the acoustic tube 18. The speed of the sound tube can be increased and the strength of the sound tube can be further improved, so that a high output sound pressure level without attenuation and generation of harmonic distortion can be suppressed.

In each of the above embodiments, the same effect can be obtained even when a structure, a box, a cabinet, or the like is provided on the rear surface of the speaker unit 1.

The ribs in the above embodiment may be provided integrally with the inner wall of the acoustic tube, or may be separately manufactured and fixed by known means.

In the second and fourth embodiments, two ribs are provided. However, more ribs may be appropriately set according to required performance.

[0042]

As described above, according to the present invention, the rib provided on the inner wall surface of the acoustic tube along the tube direction of the acoustic tube aims at lowering the reproduction frequency limit of the low frequency range and lowering the distortion. It is also possible to provide an excellent speaker device capable of realizing more natural sound reproduction in which occurrence of abnormal sound is suppressed and flat and flat sound pressure frequency characteristics.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a speaker device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an acoustic tube as the main part.

FIG. 3 shows the same sound pressure frequency characteristic diagram and second harmonic distortion characteristic diagram.

FIG. 4 is a cross-sectional view of an acoustic tube that is a main part of the other embodiment.

FIG. 5 is a cross-sectional view of an acoustic tube that is a main part of another embodiment.

FIG. 6 is a cross-sectional view of an acoustic tube that is a main part of another embodiment.

FIG. 7 is a cross-sectional view of an acoustic tube that is a main part of another embodiment.

FIG. 8 is an exploded perspective view of a conventional speaker device.

FIG. 9 is a cross-sectional view of the acoustic tube.

FIG. 10 is a structural sectional view of a television receiver incorporating the speaker device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Speaker unit 13, 18 Sound tube 15, 19 Opening 16, 17, 20, 21 Rib 22 Spiral rib

Claims (4)

[Claims] At least a speaker unit, a sound tube coupled to a front surface of the speaker unit and having an inner surface with a smooth air flow, and provided on an inner wall surface of the sound tube along a direction of the sound tube. Speaker device comprising a rib. 2. The speaker device according to claim 1, wherein a plurality of ribs are provided. 3. The speaker device according to claim 1, wherein the opening of the acoustic tube has a substantially rectangular shape, and is mounted between a cabinet of the television receiver and the cathode ray tube. 4. The speaker device according to claim 1, wherein the rib provided on the inner wall of the acoustic tube is spirally provided in the direction of the acoustic tube.