JPH0779491A - Speaker equipment and television receiver using it - Google Patents

Abstract

PURPOSE:To form a speaker equipment with simple and inexpensive configuration by solving a problem of deteriorating the characteristic due to lots of sound waves radiating a speaker rear side with respect to the speaker equipment used for a television receiver or the like. CONSTITUTION:A cover 4 with a bottom is mounted overlappingly to a rear side of a speaker 1 whose front side is coupled with an acoustic tube 2 and a radiation sound from the rear side of the speaker 1 is led to a front side opening 3 and emitted. Then the speaker equipment in which the sound pressure and the sound quality are improved and the cost is reduced is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a speaker device which is used in a television receiver and which is connected to an acoustic tube for guiding sound waves, and a television receiver using the speaker device.

[0002]

2. Description of the Related Art In recent years, a speaker device having a narrow opening and an open rear surface type acoustic tube is widely used because of its advantage of providing a clear sound only to a listener located in a specific direction.

A conventional speaker device will be described below. FIG. 6 is a plan view showing the conventional speaker device described above, and FIG.
6 is a structural conceptual diagram of a television receiver incorporating the same speaker device. In FIGS. 6 and 7, 12 is an acoustic tube, 11
Is a speaker, 13 is an opening of the acoustic tube 12, 14 is a television cabinet, 16 is a back cavity, and 15 is a cathode ray tube.

A television receiver having a conventional speaker device having the above-described structure has a speaker device in which an acoustic tube 12 for guiding sound waves is arranged and coupled to the front surface of a speaker 11, as shown in FIG. Built-in along the cathode ray tube 15 inside the receiver, and also the TV cabinet 1
By making 4 the structure along the speaker device, the television receiver can be made smaller and slimmer.

In the conventional speaker device configured as described above, first, when an input signal is applied to the speaker 11, the diaphragm of the speaker 11 vibrates, and the vibration becomes a sound wave, which is elongated and almost rectangular. Acoustic tube 12 configured in a shape
A more natural sound is reproduced from the opening 13 of the.

[0006]

However, in the above-mentioned conventional configuration, there is a sound wave emitted from the front surface of the speaker 11 and a sound wave emitted to the rear surface of the speaker 11 at the same time, and the amount of the sound wave is such that the front surface <(rear surface → television image reception). The amount of sound emitted from the back cover of the machine is larger, and the amount of sound waves emitted from the rear surface is larger, and the phase difference of sound pressure is also combined to work in the direction of canceling the sound from the front, especially the sound pressure feeling of vocal is remarkable. There is a problem in that the sound quality is deteriorated, the sound localization is deteriorated, and the sound quality is adversely affected.

[0007] In addition, there are many cost constraints, and the normal B
There is a problem in that it is difficult to have a closed structure that shuts off the sound radiated to the rear surface of the speaker 11 like the OX type speaker device.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a speaker device which is structurally simple and inexpensive, and which has excellent radiation efficiency and sound quality.

[0009]

In order to solve this problem, the speaker device of the present invention has an acoustic tube for guiding sound waves having an elongated rectangular shape with an opening formed on the front surface of the speaker, and the above-mentioned rear surface of the speaker. The configuration is such that a bottomed cover is attached that extends beyond the speaker coupling surface of the acoustic tube toward the opening and has an opening formed larger than the outer peripheral portion of the acoustic tube.

[0010]

With this configuration, the sound emitted from the rear surface of the speaker is reflected by the bottom surface of the cover and emitted from the opening of the cover, and the sound emitted from the front surface of the speaker through the acoustic tube and the direction of the sound emitted. Since the sound pressure is the same, the sound pressure and the sound image localization feeling can be improved, and a speaker device with excellent sound quality can be obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing the construction of a speaker device in the embodiment, and FIG. 2 is a perspective view thereof. In FIGS. 1 and 2, 1 is a speaker for generating sound waves, and 2 is a front surface of the speaker 1. The acoustic tube 2 is a coupled acoustic tube, and the opening 3 of the acoustic tube 2 is formed in an elongated rectangular shape. Reference numeral 4 denotes a bottomed cover attached to the rear surface of the speaker 1, and the opening of the cover 4 extends in the direction of the opening 3 beyond the speaker coupling surface of the acoustic tube 2 as shown by the hatched portion in FIG. The acoustic tube 2 and the acoustic tube 2 have a predetermined gap by being made larger than the outer peripheral portion of the acoustic tube 2 and configured so as to be extended to (hereinafter, referred to as the overlap portion 5).

FIG. 3 is a cutaway perspective view of a main part showing a state in which the above speaker device is built in a television receiver, and FIG. 4 is a conceptual plan view of the same. In FIGS. 3 and 4, 6 is a TV cabinet and 7 is a cathode ray. The tube, 8 is a back cavity.

The speaker device of the present invention constructed as described above has a configuration in which the acoustic tube 2 is arranged and coupled to the front portion of the speaker 1 as shown in FIG. 4, and the cathode ray tube 7 inside the television receiver and the television cabinet. Not only is it possible to make the television receiver compact and slim by incorporating it along the line 6, but also the cover 4 mounted on the rear surface of the speaker 1 reflects the radiated sound emitted to the rear surface of the speaker 1. Is emitted to the front surface of the speaker 1.

Therefore, the radiated sound 9 directed to the front is shown in FIG.
As shown in, the direction of the radiated sound 10 radiated from the front surface of the speaker 1 to the front surface through the acoustic tube 2 becomes the same, and the sound is simultaneously radiated from the narrow opening 11 on the front surface of the television receiver. It is possible to provide a speaker device with excellent sound quality, which is free from adverse effects of radiation sound radiated to the rear surface of the speaker 1 as in the past, improves output sound pressure and sound image localization, and has less distortion. The result of measuring the reproduction output sound pressure frequency characteristic of this speaker device is compared with the same characteristic of the conventional speaker device.
Shown in.

Further, by adjusting the length of the overlapping portion of the cover 4 of the speaker device according to the present invention and the size of the gap with the acoustic tube 2, it is possible to easily obtain the effect of the bass reflex port. It is also possible to improve the low frequency reproduction capability.

[0017]

As described above, since the speaker device according to the present invention can block the radiated sound radiated to the rear surface of the speaker with a simple structure, the low frequency range due to the wraparound of the sound wave from the back of the television receiver. It is possible not only to improve the output sound pressure attenuation, improve the output sound pressure and the sound image localization feeling, and provide a speaker device with excellent sound quality with less distortion, but also to overlap the acoustic tube and the cover. By adjusting, the bass reflex port effect can be easily obtained and the low frequency reproduction capability can be improved.

Further, since the structure is simple, there is no significant increase in cost and assembly man-hours as in the closed box type.
It can be easily and inexpensively produced and has great practical value.

[Brief description of drawings]

FIG. 1 is a plan view showing the configuration of a speaker device according to an embodiment of the present invention.

FIG. 2 is a perspective view of the same.

FIG. 3 is a cutaway perspective view of essential parts of a television receiver incorporating the speaker device.

FIG. 4 is a structural conceptual diagram of a television receiver including the speaker device.

FIG. 5 is a characteristic diagram comparing reproduction output sound pressure frequency characteristics of a speaker device of the present invention and a conventional speaker device.

FIG. 6 is a plan view showing the configuration of a conventional speaker device.

FIG. 7 is a structural conceptual diagram of a television receiver incorporating a conventional speaker device.

[Explanation of symbols]

 1 Speaker 2 Acoustic Tube 3 Acoustic Tube Opening 4 Cover 5 Overlap 6 Television Cabinet 7 Cathode Ray Tube 8 Back Cavity 9 and 10 Radiated Sound 11 Narrow Opening of Television Receiver

Claims (2)

[Claims] 1. A loudspeaker for guiding a sound wave having an elongated rectangular shape is coupled to a front surface of a speaker, and the loudspeaker is extended to a rear surface of the loudspeaker beyond a loudspeaker coupling surface of the acoustic tube to a direction of the opening. A speaker device having a bottomed cover having an opening formed larger than the outer peripheral portion of the acoustic tube. 2. A television receiver incorporating the speaker device according to claim 1.