JP3271351B2 - Loudspeaker device and television receiver using the same - Google Patents

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 video equipment such as a television receiver and a television receiver using the same.

[0002]

2. Description of the Related Art A method in which a horn or a sound tube is provided on the front of a speaker and a sound wave generated from the speaker is guided to an opening portion is capable of obtaining a larger output sound pressure than a case where a horn or a sound tube is not used. This has the advantage that sound is transmitted in a specific direction, and has been widely used.

Hereinafter, a speaker device using a conventional acoustic tube will be described with reference to the drawings. FIG. 3 is a plan view showing a partial cross section of the structure of a speaker device using a conventional acoustic tube. 3, reference numeral 1 denotes a speaker, 2 denotes an acoustic tube to which the speaker 1 is attached, 3 denotes an opening of the acoustic tube 2, 4 denotes a baffle plate of the acoustic tube 2 to which the speaker 1 is attached, and 5 denotes a front surface of the speaker 1. 6 is a sound tube side wall of the sound tube 2, 7 is a sound absorbing material, 8 is a sound absorbing material 7 inserted into the inside of the sound tube 2 and then arranged above the sound absorbing material 7 to form an outer wall of the sound tube 2. The sound absorbing material cover 9 includes the sound absorbing material cover 8 and the acoustic tube 2.
3 shows an adhesive to which is adhered.

FIG. 4 is an acoustic characteristic diagram showing acoustic characteristics of the above-mentioned conventional speaker device. The operation of the speaker device using the conventional acoustic tube 2 configured as described above will be described below. As shown in FIG. 3, the sound wave radiated from the speaker 1 is transmitted through the sound guide formed by the reflection plate 5 to the opening 3.
Will be led to.

The sound absorbing material 7 arranged inside the acoustic tube 2
Is provided for removing a standing wave generated inside the acoustic tube 2, and as shown in FIG.
When the sound absorbing material 7 is not provided, the sound characteristics have many peak dips as shown by the broken line. However, by providing the sound absorbing material 7, the sound characteristics can be improved to the sound characteristics shown by the solid line.

As described above, in the case of a television receiver equipped with a conventional speaker device having an elongated opening having a substantially rectangular shape, it is possible to make the television receiver compact and slim, and to obtain a sound that is almost natural. It can be reproduced.

[0007]

However, in the above-mentioned conventional configuration, it is necessary to arrange a larger amount of the sound absorbing material 7 inside the acoustic tube 2 in order to further reduce the peak dip in acoustic characteristics. In this case, the sound wave of the high-frequency component is greatly attenuated, which is not satisfactory as a speaker device. Therefore, in the case of the conventional speaker device, a suitable amount of the sound absorbing material 7 is arranged, and a certain amount of peak dip in acoustic characteristics is obtained. By using a speaker device in a state where the sound is left, means for balancing sound pressure levels from low-frequency components to mid-high frequency components and realizing near-natural sound reproduction has been used. When it is seen as a speaker device for use, there is a problem that it is not sufficiently satisfactory.

An object of the present invention is to solve the above-mentioned conventional problems, and to provide a speaker device capable of achieving a small and slim television receiver and further improving the sound quality, and a television receiver using the same. It is intended for.

[0009]

According to the present invention, there is provided a loudspeaker apparatus comprising: a front end of a loudspeaker; Inside, a first reflector that is arranged in the direction of sound wave radiation emitted from the speaker and forms a sound conductor, and a first reflector provided between the first reflector and the acoustic tube side wall. A sound absorbing material, and a second reflector provided between the first sound absorbing material and a baffle plate to which the speaker is attached, and a second reflector between the second reflector and the baffle plate. A sound absorbing material is arranged, and a part of the second sound absorbing material forms an outer wall of the acoustic tube, and the first sound absorbing material and the second sound absorbing material are formed by the second reflector and the acoustic tube side wall. It is configured to be adjacently arranged via the formed cavity.

[0010]

According to this structure, the opening is formed in an elongated rectangular shape in consideration of the incorporation into the device, and even in a speaker device in which the opening of the sound tube is made slim, a specific frequency determined by the length of the sound tube. The peak dip in the acoustic characteristics caused by the standing wave generated in the sound tube can be greatly attenuated by the second reflector and the second sound absorbing material provided inside the acoustic tube, and the television receiver can be made smaller and slimmer. This makes it possible to further improve the sound quality of a speaker device capable of performing the above.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. Note that the same reference numerals as those in FIG. 3 indicate the same parts.

FIG. 1 is a plan view partially showing the structure of a speaker device according to an embodiment of the present invention. In FIG. 1, 1 is a speaker, 2 is a sound tube, 3 is an opening of the sound tube 2, 4 is a baffle plate, 6 is a sound tube side wall, 8 is a sound absorbing material cover, 9 is a sound tube 2 and a sound absorbing material cover 8, Is a first reflector provided on the front surface of the speaker 1, 11 is a first sound absorbing material provided between the first reflector 10 and the acoustic tube side wall 6, and 12 is a first sound absorbing material. A second reflector 13 provided between the first sound absorbing material 11 and the baffle plate 4 to which the speaker 1 is attached is a second sound absorbing member 13 arranged between the second reflector 12 and the baffle plate 4. Material.

FIG. 2 is an acoustic characteristic diagram showing acoustic characteristics of the speaker device according to the embodiment of the present invention shown in FIG.

In the case of the loudspeaker device of the present invention configured as described above, even in a loudspeaker device in which the opening 3 of the acoustic tube 2 is made slim, the sound is generated at a specific frequency determined by the length of the acoustic tube 2. This makes it possible to greatly attenuate the occurrence of peak dips in the acoustic characteristics due to standing waves, and as shown in the acoustic characteristic diagram of FIG. Characteristics are obtained,
This achieves natural sound reproduction.

A mechanism for realizing the flat acoustic characteristics of the speaker device according to one embodiment of the present invention will be described below.

The sound wave radiated from the loudspeaker 1 into the acoustic tube 2 is guided by the reflector 10 to the opening 3 of the acoustic tube 2 without attenuating high frequency components, and
The standing wave generated inside the acoustic tube 2 is greatly reduced by the first sound absorbing material 11 and the second sound absorbing material 13, and furthermore, between the first sound absorbing material 11 and the second sound absorbing material 13. The provided second reflector 12 and the second reflector 12 and the acoustic tube side wall 6
The sound wave reflected by the baffle plate 4 through the cavity constituted by the above makes it possible to control the attenuation of the middle band component.

Further, since a part of the second sound absorbing material 13 forms the outer wall of the acoustic tube, the absorption of the standing wave can be effectively realized with a small amount of the sound absorbing material. By emitting a part of the sound wave of the component from one side of the second sound absorbing material 13 forming the outer wall of the acoustic tube, it is possible to significantly attenuate the peak dip in acoustic characteristics, thereby realizing high sound quality.

[0018]

As described above, according to the present invention, an acoustic tube for guiding sound waves having an elongated and substantially rectangular shape is coupled to the front surface of a speaker, and the inside of the acoustic tube is used for transmitting sound waves radiated from the speaker. A first reflector arranged in the radial direction to form a sound conductor, a first sound absorber provided between the first reflector and the acoustic tube side wall, a first sound absorber, and a speaker And a second reflector provided between the second reflector and the baffle, and a second sound absorber is disposed between the second reflector and the baffle. A part of which forms the outer wall of the acoustic tube, and the first sound absorbing material and the second sound absorbing material are disposed adjacent to each other via a cavity formed by the second reflector and the acoustic tube side wall. Higher sound quality of a speaker device that enables a compact and slim TV receiver One in which it is possible.

[Brief description of the drawings]

FIG. 1 is a plan view showing a structure of a speaker device according to an embodiment of the present invention in a partial cross section.

FIG. 2 is an acoustic characteristic diagram of the speaker device according to the embodiment of the present invention shown in FIG.

FIG. 3 is a plan view showing a partial cross section of the structure of a speaker device using a conventional acoustic tube.

FIG. 4 is an acoustic characteristic diagram of a speaker device using a conventional acoustic tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Speaker 2 Acoustic tube 3 Opening 4 Baffle plate 6 Acoustic tube side wall 8 Sound absorbing material cover 9 Adhesive material 10 First reflecting plate 11 First sound absorbing material 12 Second reflecting plate 13 Second sound absorbing material

Continuing on the front page (72) Inventor Kiyoshi Ohashi 1006 Kadoma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. References JP-A-4-35399 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04R 1/28 310 H04N 5/64 541 H04R 1/02 102 H04R 1/30

Claims (2)

(57) [Claims] An acoustic tube for guiding a sound wave having an elongated and substantially rectangular shape is coupled to a front surface of a speaker, and the inside of the acoustic tube is arranged in a radiation direction of a sound wave radiated from the speaker. A first reflector that forms a sound guide, a first sound absorbing material provided between the first reflector and the acoustic tube side wall, and a baffle plate to which the first sound absorbing material and a speaker are attached. The second sound absorbing material is disposed between the second reflecting plate and the baffle plate, and a part of the second sound absorbing material is formed on the outer wall of the acoustic tube. And the first sound-absorbing material and the second sound-absorbing material are arranged adjacent to each other via a cavity formed by the second reflector and the acoustic tube side wall. Speaker device. 2. A television receiver using the speaker device according to claim 1.