JP2000333283A - Loudspeaker system and television receiver using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a loudspeaker system with an excellent acoustic characteristic and a television receiver with respect to the loudspeaker system used for a video device such as a television receiver and the television receiver using it. SOLUTION: The loudspeaker system comprises an acoustic tube 2 having a 2nd opening 2b on one side face and a fitting face 17 that encloses the 2nd opening and is in close contact with a television cabinet, a sound path 4 of the acoustic tube 2 is formed by using the television cabinet so as to extend a degree of freedom of volume design of the sound path 4 thereby realizing a high output sound pressure level, more natural sound reproduction and a flat and uniform sound pressure frequency characteristic.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device used for various audio equipment such as video equipment, automobiles, information, and communications, and a television receiver using the same.

[0002]

2. Description of the Related Art A method of connecting a horn or a sound tube to the front of a speaker unit and guiding sound waves generated from the speaker unit to the opening of the sound tube is more effective than a method using no horn or sound tube. Are widely used, and sound is transmitted in a specific direction.

A conventional speaker device will be described with reference to FIGS.

FIG. 7 is an exploded perspective view of a conventional speaker device, and FIG. 8 is a structural sectional view of a television receiver incorporating the speaker device.

First, a speaker in a television receiver will be described. 1 is a speaker unit, 2 is an acoustic tube formed by resin molding, 6 is a first opening of the acoustic tube 2, 12 is a television cabinet, and 13 is a television cabinet. Cathode ray tube,
14 is a back cabinet, a is a sound tube opening dimension, and b is a television cabinet width dimension.

The operation of the television receiver having the above-configured speaker device will be described below.

[0007] Sound waves emitted from the speaker unit 1 are emitted outward through an acoustic tube 2 having a first opening 6 formed in an elongated and substantially rectangular shape disposed on the front surface thereof. The acoustic tube 2 has a structure along the television cabinet 12 and the cathode ray tube 13 inside the television receiver, and guides and emits sound waves to the front from the opening 6 of the narrow acoustic tube 2, It emits sound waves to the front of the television receiver. In particular, by reducing the opening size a of the sound tube, the width b of the television cabinet can also be reduced, and the television receiver can be made smaller and slimmer. It will contribute.

Next, the details of the above-mentioned speaker device including the speaker unit 1 and the acoustic tube 2 will be described. Reference numeral 1 denotes a speaker unit for generating a sound wave, 2 denotes an acoustic tube for guiding the sound wave 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 inside the acoustic tube 2 pass, 5 denotes a resonator hole for controlling a standing wave generated inside the acoustic tube 2, and 6 denotes a sound hole of the acoustic tube 2 which emits sound waves. 1 is an opening. Reference numeral 7 denotes a speaker unit mounting screw for connecting and fixing the acoustic tube 2 and the speaker unit 1, 8 denotes a sound absorbing material mounted in the sound absorbing chamber 3, 9
Reference numeral 10 denotes a sound absorbing chamber cover for closing the sound absorbing chamber 3, 10 denotes a sound absorbing chamber cover fixing screw for fixing the sound absorbing chamber cover 9, and 1 denotes
Reference numeral 1 denotes an adhesive for hermetically fixing the acoustic tube 2 and the sound-absorbing chamber cover 9, and a denotes the opening size of 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 is guided to the sound path 4 of the sound tube 2 coupled to the front surface of the speaker unit 1 and emitted from the opening 6 of the sound tube on the front surface. You. The amount of this sound wave is determined to some extent by the size of the opening a of the acoustic tube.

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 6 of the acoustic tube 2. Since the standing wave is amplified by reflecting inside, the sound pressure frequency characteristics with severe peak dip are distorted,
Resonator hole 5 and sound absorbing chamber 3 provided inside acoustic tube 2
The standing wave generated inside the acoustic tube 2 is absorbed by the sound absorbing material 8 provided inside the sound tube 2 to create a flat sound pressure frequency characteristic.

In order to maintain the sound absorbing effect of the sound absorbing material 8 in the sound absorbing room 3, the sound absorbing room cover 9 is fixed with a sound absorbing room cover mounting screw 10, and an adhesive 11 applied around the sound absorbing room cover 9 is used. Sealed.

As described above, natural sound reproduction is possible even in the speaker device in which the acoustic tube opening dimension a of the elongated and substantially rectangular acoustic tube 2 is reduced, and the cabinet width dimension b of the television receiver is obtained. Can also be kept small.

[0014]

However, in the above-mentioned conventional configuration, the acoustic tube 2 for guiding sound waves for natural sound reproduction in a limited space or a television receiver.
There is a limit to increasing the size of the sound tube, and the acoustic tube 2 and the sound absorbing chamber cover 9 configured to guide sound waves are formed of a resin material or the like. In addition, since the cabinet width dimension b of the television cabinet 12 is restricted, the opening size a of the acoustic tube is narrowed as a result, and the configuration is realized at the expense of the volume of the sound path and the volume of the sound absorbing chamber 3. However, the standing wave inside the acoustic tube 2 cannot be sufficiently removed because the design flexibility of the volume of the sound path 4 and the sound absorbing chamber 3 is substantially lost.
It has been difficult to completely suppress and prevent sound quality degradation.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a high output sound pressure level even in a limited space, and realizes a more natural sound reproduction and a flat and flat sound pressure frequency characteristic. It is an object of the present invention to provide a speaker device and a television receiver using the same.

[0016]

In order to solve the above problem, a speaker device according to the present invention has at least a speaker unit, a first opening on a front surface connected to a front surface of the speaker unit, and a first opening on one side surface. A sound tube having two openings, and a fitting surface portion that is in close contact with an adjacent member of another device that seals the second opening. By making close contact with the adjacent members of the device, the sound path of the acoustic tube is formed by using the adjacent members, the design freedom of the volume of the sound path is expanded in a limited space, and a high output sound pressure level and An object of the present invention is to provide an excellent speaker device that can realize more natural sound reproduction and flat and flat sound pressure frequency characteristics.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a speaker device according to the present invention.
Is a sound tube having at least a speaker unit, a first opening on a front surface coupled to a front surface of the speaker unit, and a second opening on one side surface, and sealing the second opening. A sound path of an acoustic tube is formed by using an adjacent member of another device and a fitting surface portion that is in close contact, and closing the second opening on the side surface by using an adjacent member of the other device. Since the sound tube can be designed without a part of the wall thickness required for the tube, the degree of freedom in designing the volume of the sound path is expanded in a limited space, so that higher output sound pressure levels and more natural A sound reproduction and a flat and flat sound pressure frequency characteristic can be realized.

According to a second aspect of the present invention, there is provided a sound absorbing chamber having an opening which is tightly sealed with an adjacent member of another device in the acoustic tube according to the first aspect. The sound absorbing room cover is also used as the adjacent member of the other device, so the volume of the sound absorbing room can be increased by the cover of the conventional sound absorbing room, and more natural sound reproduction and flat and flat sound pressure frequency characteristics are realized. You can do it.

According to the third aspect of the present invention, a speaker unit insertion guide rail is provided on the speaker unit mounting surface of the acoustic tube according to the first aspect, and the speaker unit is inserted and mounted on the guide rail. This eliminates the need for screws for mounting the speaker unit, thereby reducing the number of mounting steps.

According to a fourth aspect of the present invention, there is provided a sound tube according to the first aspect, wherein the sound tube has a hole communicating with a sound path on a second opening side of the sound tube, and a surface having the hole is opposed to a surface having the hole. A sound-absorbing block whose surface is a third opening and whose third opening is tightly sealed with an adjacent member of the second other device. The cover is eliminated to reduce the number of assembling steps. It is an object of the present invention to provide an excellent speaker device that achieves both a high sound pressure level that can be reduced and a low price.

According to a fifth aspect of the present invention, the hole leading to the acoustic tube according to the fourth aspect is covered with a nonwoven fabric tape, so that a flat and flat sound pressure frequency characteristic can be realized and sound absorption is achieved. When a material is also used, a speaker device having better sound pressure frequency characteristics can be provided.

According to a sixth aspect of the present invention, the first opening of the speaker device according to any one of the first or second aspect or the fourth or fifth aspect is provided in a television cabinet. An adjacent member, which is desired on the front side and seals the side opening, is constituted by a cathode ray tube or a television cabinet, thereby making it possible to provide a television receiver having excellent acoustic characteristics.

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 a speaker device according to an embodiment of the present invention, and FIG. 2 is a structural sectional view of a television receiver incorporating the speaker device. 3 is the same sound pressure frequency characteristic diagram and second harmonic distortion characteristic diagram.

Only the differences between the present invention and the prior art will be described with reference to the figure. Reference numeral 15 denotes a sound absorbing chamber, 16 denotes a first opening of the acoustic tube 2, 17 denotes a fitting surface portion of the acoustic tube, 1
Reference numeral 8 denotes a first buffer member attached to the fitting surface portion 17, reference numeral 19 denotes a second buffer member provided near a mounting portion of the speaker unit 1, and C denotes an opening size of the acoustic tube. .

In the present embodiment, the wall of the acoustic tube 2 connected to the front surface of the speaker unit 1 and the portion of the sound absorbing room 15 formed by a part of the acoustic tube 2 corresponding to the conventional sound absorbing room cover 9 are formed. A second opening 2b is formed, and a fitting surface portion 17 wider than the end surface is formed on the outer periphery of the end surface of the second opening 2b.

Numeral 20 denotes a cabinet fitting portion which is closely connected to the fitting surface portion 17 via the first cushioning member 18. One side of the acoustic tube 2 is bonded and covered with the TV cabinet 12 to cover the acoustic tube 2. The volume of the second sound path 4 and the sound absorbing chamber 15 is enlarged to improve the sound pressure level.

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 26 of the speaker device of the present embodiment is shown. Shows that the sound pressure frequency characteristic 27 is higher than the sound pressure frequency characteristic 27 of the conventional speaker device over the entire band, and it is also possible to reproduce the extended low frequency range even in the low frequency range of the sound pressure frequency characteristic. 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.

Further, it has been confirmed that, compared to the second harmonic distortion 29 of the conventional one, the one 28 of the present embodiment realizes a low distortion and obtains a high linearity.

The first and second embodiments in the above embodiment
The cushioning members 18 and 19 are for improving the degree of sealing and suppressing the propagation of vibration. If the characteristics are not necessary, the acoustic tube 2 and the television cabinet 12 may be directly bonded with an adhesive. .

The wide fitting surface portion 17 provided on the outer periphery of the end face of the second opening 2b is made wide in order to maintain the adhesive strength at the time of close contact and sealing with the cabinet fitting portion 20. In particular, a portion that does not require adhesive strength may use the end of the acoustic tube 2 as it is.

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

FIG. 4 is an exploded perspective view of the speaker device.
Only the differences between the first embodiment and the present embodiment will be described with reference to the same drawing. Reference numeral 21 denotes a speaker unit insertion guide rail, and a speaker unit insertion guide rail 21 is formed on the mounting surface of the acoustic tube 2 on the speaker unit 1 side. The speaker unit 1 can be fixed when the speaker device is mounted on the TV cabinet 12 with the insertion direction being the TV cabinet 12 side.
Since the speaker unit 1 can be easily incorporated and the speaker unit mounting screw can be eliminated,
An object of the present invention is to provide an excellent loudspeaker device at low cost with improved assemblability.

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

FIG. 5 is an exploded perspective view. Only the differences between the first embodiment and the present embodiment will be described with reference to FIG.
Numeral 2 denotes a sound absorbing block in which the sound tube 2 is integrated with or separate from the sound tube 2, and 23 denotes a sound absorbing block 22.
The sound absorbing block 22 is provided with two or more sound absorbing blocks 22. The sound absorbing block 22 has a structure in which one of the sound absorbing blocks 22 is opened. The sound absorbing member 8 is inserted into the sound absorbing block 22 from the cathode ray tube 13 side, and the hole 23 is provided between the sound absorbing block 22 and the acoustic tube 2 as described above. In addition to the first second opening 2b, the third opening on the opposite side can also be sandwiched between the TV cabinet 12 and the cathode ray tube 13 to form the acoustic tube 2 closely, so that the sound path 4 can be substantially expanded. It is possible to reduce the number of parts while reducing the number of assembling steps, and to provide an excellent speaker device that achieves both high sound pressure level and low price.

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

FIG. 6 is an exploded perspective view. Only the differences between the first embodiment and the present embodiment will be described with reference to FIG.
Reference numeral 3 denotes a hole provided in the sound absorbing block 22, and reference numeral 24 denotes a nonwoven fabric tape. The hole 23 is opened and the upper surface is covered with the nonwoven fabric tape 24.
And a small hole 23 and a nonwoven fabric tape 24 to form a resonator structure, which can simplify the structure of the sound-absorbing chamber 3 which is conventionally sealed, and has a flat and flat sound pressure frequency without using the sound absorbing material 8. It is possible to provide an excellent speaker device that can realize characteristics.

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.

Further, the sound absorbing chamber 1 in each of the above embodiments is described.
5, sound absorbing material 8, sound absorbing chamber hole 23, sound absorbing block 22, hole 2
Structures such as 3 can achieve the same effect even if the combination is changed according to the purpose or purpose of the characteristic.

[0040]

As described above, according to the present invention, the sound path of the acoustic tube is formed by using the adjacent member to closely contact the opening of the speaker device with the adjacent member of another device. To provide an excellent speaker device that can expand the degree of freedom of design of the sound and sound absorbing chamber in a limited space and realize a high output sound pressure level, more natural sound reproduction, and flat and flat sound pressure frequency characteristics. It is possible.

[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 structural sectional view of a television receiver incorporating the speaker device.

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

FIG. 4 is an exploded perspective view of a speaker device according to another embodiment.

FIG. 5 is an exploded perspective view of a speaker device according to another embodiment.

FIG. 6 is an exploded perspective view of a speaker device according to another embodiment.

FIG. 7 is an exploded perspective view of a conventional speaker device.

FIG. 8 is a structural sectional view of a television receiver incorporating the speaker device.

[Explanation of symbols]

 Reference Signs List 1 speaker unit 2 sound tube 2b second opening 12 television cabinet 13 cathode ray tube 15 sound absorbing room 16 first opening 17 fitting surface portion 20 cabinet fitting portion 21 speaker unit insertion guide rail 22 sound absorbing block 23 hole 24 non-woven fabric tape

Claims (6)

[Claims] 1. A sound tube having at least a speaker unit, a first opening on a front surface coupled to a front surface of the speaker unit, and a second opening on one side surface;
A speaker device comprising an adjacent member of another device that seals the second opening and a fitting surface portion that is in close contact with the other member. 2. The speaker device according to claim 1, wherein a sound absorbing chamber having an opening that is tightly sealed with an adjacent member of another device is provided in the acoustic tube. 3. The speaker device according to claim 1, wherein a speaker unit insertion guide rail is provided on the speaker unit mounting surface of the acoustic tube, and the speaker unit is inserted and mounted on the guide rail. 4. A sound tube having a hole communicating with a sound path on a second opening side of the sound tube, a surface opposite to a surface having the hole is defined as a third opening, and the third opening is defined as a second opening. The speaker device according to claim 1, further comprising a sound absorbing block that is tightly sealed with an adjacent member of another device. 5. The speaker device according to claim 4, wherein the hole communicating with the acoustic tube is covered with a nonwoven fabric tape. 6. The television cabinet as claimed in claim 1, wherein the first opening faces the front side of the television cabinet and the adjacent member for closing the side opening is a cathode ray tube or a television cabinet. Item 5
A television receiver using the speaker device according to any one of the above.