JPH05168084A - Speaker unit and television receiver using the same - Google Patents

Abstract

PURPOSE:To provide a speaker unit with superior acoustic characteristic and wide variety of cost performance by solving problems of the deterioration of the voice articulation and the wide use of the acoustic material due to the disturbance of the sound pressure frequency characteristic in the middle-high reproduction band and the characteristic with too much peak dip in the speaker used for the video equipment such as television receiver, on-vehicle acoustic device, and various acoustic equipment. CONSTITUTION:A first reflection board 12 is placed in front of a speaker unit 15 enabling the correction of the acoustic characteristic. A second reflection board 22 is separately arranged to place a leading part 21 on this side of a tailing part 20 of the first reflection board. Further, a space 19 between the first reflection board 12 and the second reflection board 22 are kept apart from the room of the acoustic material 11. The resonance caused by the two separate reflection boards emphasizes the frequency band of 500 to 5kHz to improve the sound pressure. Thus, the speaker unit improving the sound articulation can be 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 in which an acoustic tube for guiding sound waves is arranged on the front surface of a speaker used in video equipment such as a television receiver, automobiles and various audio equipments, and a television image receiving the same. It's about machines.

[0002]

2. Description of the Related Art A method in which a horn or an acoustic tube is provided on the front surface of a speaker and a sound wave generated from the speaker is guided to an opening can obtain a large output sound pressure as compared with the case where a horn or an acoustic tube is not used. , Has the advantage that sound can be transmitted in a specific direction, and has been widely used in the past.

A conventional speaker device using an acoustic tube will be described below with reference to the drawings. FIG. 6 is a structural conceptual diagram of a television receiver incorporating the above speaker device. In FIG. 6, 1 is an acoustic tube, 7 is a speaker unit,
32 is a television cabinet, 33 is a cathode ray tube, and 34 is a back cavity.

The operation of the television receiver incorporating the speaker device constructed as described above will be described. As shown in FIG. 6, a speaker device in which a sound tube 1 for guiding sound waves is arranged on the front surface of a speaker unit 7 is built in along with a cathode ray tube 33 inside a television receiver, and a TV cabinet 32 is provided in the speaker device. By adopting a structure that conforms to, it is possible to make the television receiver smaller and slimmer.

FIG. 5 is a plan sectional view showing the structure of the conventional speaker device. In FIG. 5, 8 is a vibrating portion of the speaker unit 7 for generating sound waves, 9 is an edge rib for hermetically connecting the speaker unit 7 and the acoustic tube 1, and 6 is a narrowing portion of the throat provided on the front surface of the speaker unit 7. Reference numeral 3 is a reflector provided on each side for guiding the sound wave radiated from the speaker unit 7 to the acoustic tube opening 5, 2 is a sound absorbing material, and 4 is a sound path through which the sound wave passes.

The operation of the speaker device configured as described above will be described below. First, when an input signal is applied to the speaker unit 7, the speaker vibrating portion 8 vibrates, and sound waves are radiated from the acoustic tube opening 5 through the sound path 4 inside the acoustic tube 1. However, since the acoustic impedance is largely changed at the acoustic tube opening 5, a part of the sound wave is reflected and returns to the sound path 4 to form a standing wave,
In addition, the standing sound wave generated in the length of the acoustic tube 1 causes a reproduced sound pressure frequency characteristic in which the peak dip is severely disturbed.
However, the sound absorbing material 2 arranged inside the acoustic tube 1 is
By absorbing and suppressing each of these standing waves, a flat reproduced sound pressure frequency characteristic is created. That is, the sound absorbing material 2 plays an important role in the reproduction principle of this type of speaker device. Further, the reflection plate 3 is arranged so that the sound emitted from the speaker vibrating portion 8 and enhanced by the throat narrowing portion 6 is not directly absorbed by the sound absorbing material 2, and also acts on the correction in the middle range in particular. As a result, natural sound reproduction is possible with the acoustic tube opening 5 configured to be elongated and nearly rectangular.

[0007]

However, in the above-mentioned conventional structure, as shown in FIG. 5, the sound absorbing material 2 provided for suppressing the standing wave generated inside the acoustic tube 1 absorbs even the sound waves of the middle and high frequency components. The reflector 3 is provided for the purpose of preventing this phenomenon.
As shown by 31 in FIG. 4, the sound pressure frequency characteristics in the mid-high range reproduction band are disturbed due to the length of the peaks, resulting in a characteristic with many peak dips, and the intelligibility of the voice decreases. . Further, a large amount of the sound absorbing material 2 has to be used in order to suppress the standing wave, and a problem remains in terms of cost.

The present invention solves the above-mentioned problems of the prior art by improving speaker clarity and cost performance, and further, by providing a speaker device having excellent acoustic characteristics in which reproduced sound pressure frequency characteristics are flat and flat. It is intended to be provided.

[0009]

In order to solve this problem, a speaker device according to the present invention has an acoustic tube for guiding a sound wave having a rectangular opening at the front surface of the speaker, and a speaker unit is installed inside the acoustic tube. A first reflector is installed on the front of the speaker unit to configure the sound path of the emitted sound waves and the acoustic characteristics can be corrected, and an independent placement is made so that the start end comes before the end end of the reflector. The second reflection plate has a second reflection plate, and the gap between the first reflection plate and the second reflection plate has a distance to communicate with the room of the sound absorbing material. It has a configuration set to emphasize the frequency band of 5 KHz.

[0010]

With this configuration, even in a speaker device having a horn or an acoustic tube having an elongated rectangular shape having an opening in consideration of incorporation into a device, each two independent reflectors installed inside the acoustic tube are provided. The gap between the two reflectors is communicated with the room of the sound absorbing material, and the resonance phenomenon caused by the two independent reflectors is set to emphasize the frequency band of 500 to 5 KHz. 500 to 5 KHz, which is an important frequency band that constitutes voice
It is possible to improve the sound pressure of, and it is possible to improve the intelligibility of voice, which could not be achieved by the conventional products. In particular, by increasing the voice band, it is possible to suppress the peak dip of the reproduced sound pressure frequency characteristic and make the acoustic characteristic flat. Further, by having two reflecting plates, it is possible to realize the suppression of the standing wave with a smaller amount than that of the conventional sound absorbing material, and it is possible to reduce the cost.

[0011]

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan sectional view of a speaker device mainly including an acoustic tube portion according to a first embodiment of the present invention in FIG. In FIG. 1, reference numeral 15 is a speaker unit for reproducing all bands, and the front end of the speaker unit 15 for reproducing all bands has an elongated rectangular acoustic tube opening 13 in consideration of incorporation into a device. An acoustic tube 10 for guiding a sound wave is hermetically coupled via an edge rib 18.

Inside the acoustic tube 10, the sound path 14 of the sound wave radiated from the speaker unit 15 for reproducing the entire band.
The first reflector 12 is installed on the front surface of the speaker unit 15 so that the acoustic characteristics can be corrected, and the first reflector 21 is independent so that the start end 21 comes before the end 20. The second reflection plate 22 is arranged so that the gap 19 between the first reflection plate 12 and the second reflection plate 22 has a distance so as to communicate with the room of the sound absorbing material 11. or,
The sound absorbing material 11 for suppressing the standing wave generated inside the acoustic tube 10 is arranged on both sides of the acoustic tube opening 13 side of the first reflecting plate 12 symmetrically.

The operation of the speaker device configured as described above will be described. First, when an input signal is applied to the speaker unit 15 for full band reproduction, the speaker vibrating section 16 vibrates and the sound wave is guided to the acoustic tube opening 13 through the sound path 14 inside the acoustic tube 10. At this time, the sound pressure in a specific frequency band is emphasized by the length of the first reflector 12 and the standing wave generated by the length of the acoustic tube 10 is suppressed.
Absorbed by the sound absorbing material 11 installed on the front surface of the first reflection plate 12,
Next, the frequency band that cannot be emphasized by the first reflection plate 12 is formed by the second reflection plate 22 by forming the start end portion 21 from before the end portion 20 of the first reflection plate 12 to the first reflection plate 12.
It is possible to emphasize the sound pressure in a frequency band different from
The disturbance of the frequency band caused by the difference in arrangement between the first reflection plate 12 and the second reflection plate 22 is also caused by the first reflection plate 12 and the second reflection plate 22.
By providing a gap 19 between the sound absorbing member 11 and the sound absorbing member 11 and allowing the sound absorbing member 11 to absorb the sound, the frequency band of 500 to 5 KHz can be comprehensively controlled, and by setting the length so that the resonance phenomenon peculiar to the acoustic tube can be well generated, It is possible to improve the sound pressure of 500 to 5 KHz, which is an important frequency band that constitutes human voice.

The sound pressure frequency characteristics of the speaker device according to this embodiment and the sound pressure frequency characteristic of the conventional speaker device are shown in comparison with FIG.

As can be seen from FIG. 4, an acoustic circuit having two or more resonance systems can be constructed inside the acoustic tube by setting two independent reflecting plates, and by extension, the peak dip It becomes possible to suppress a large single resonance, and when viewed as a reproduced sound pressure frequency characteristic of a speaker device as a television receiver, it becomes possible to obtain a characteristic having a small peak dip as shown by 30 in FIG. It is possible to realize excellent acoustic characteristics by improving the clarity of the sound, flattening the reproduced sound pressure frequency characteristic, and reducing the amount of the sound absorbing material, which could not be realized in the past.

Further, by incorporating the speaker device of the present invention into a television receiver, it is possible to easily realize a small size and slimness of the television receiver, and to provide a high performance and high sound quality television receiver. It is possible.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings. The same reference numerals as those in FIG. 1 indicate the same parts.

FIG. 2 is a plan sectional view of a speaker device mainly including an acoustic tube portion according to the second embodiment of the present invention. Figure 2
24 is a left-right asymmetric second reflector that is installed so that the start end comes before the end of the first reflector 12, and 25 is the right-side second reflector that is installed asymmetrically with the left second reflector 24. Both of the two reflection plates form a start end portion 21 from before the end portion 20 of the first reflection plate 12.

As described above, in the case of the second embodiment, the sound wave passes through the sound path 14 inside the sound tube 10 and the sound tube opening 13 is formed.
In that case, the length of the first reflector 12 emphasizes the sound pressure in a specific frequency band, and the standing wave generated by the length of the acoustic tube 10 is suppressed by the first reflector 12. The second reflection plate 2 is formed by forming the start end portion 21 from before the end portion 20 of the first reflection plate to absorb the frequency band that cannot be emphasized by the first reflection plate 12 after being absorbed by the sound absorbing material 11 installed on the front surface.
The sound pressure in a frequency band different from that of the first reflector 12 can be emphasized by 4, 25, and the frequency band that can be further emphasized can be subdivided by further making the sound pressure asymmetric. Controlling the sound pressure can be facilitated by making the arrangement positions of the second reflectors 24 and 25 independent. Overall, the position of the peak dip in the reproduced sound pressure frequency characteristic can be adjusted more easily than in the first embodiment, and excellent acoustic characteristics can be realized as a speaker device for a television receiver.

(Third Embodiment) A third embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a plan sectional view of a speaker device mainly including an acoustic tube portion according to a third embodiment of the present invention. Figure 3
In the figure, reference numeral 26 denotes a left-side second reflector having a left-right asymmetrical irregular shape, which is installed such that the start end portion comes before the end portion of the first reflector plate 12, and 27 is asymmetrical and irregularly shaped with the left second reflector plate 26. The right side second reflecting plate installed on the first side of the first reflecting plate 12 forms the starting end portion before the terminating end portion of the first reflecting plate 12. Furthermore,
The second reflection plate 26 on the left side of the asymmetrical irregular shape is used as the acoustic tube opening 1
By installing it on the third side, a cavity 28 having a large space can be formed in the acoustic tube 10. On the contrary, the above-mentioned space becomes a slightly small cavity 29 by disposing the right side second reflecting plate 27 having an asymmetrical irregular shape in the vicinity of the throat narrowing portion 17 side.

As described above, in the case of the third embodiment, the inner space of the first reflector 12 can be largely removed by making the shape different from that of the second embodiment, that is, The amount of resin forming the acoustic tube 10 can be suppressed to a small amount, and a speaker device excellent in cost can be provided.

It is needless to say that the same effect can be obtained when the rear cabinet, the bass reflex port, etc. are provided in the speaker device constructed by the structure of the acoustic tube 10 of the present invention.

[0025]

As described above, the speaker device according to the present invention has an important frequency band 500 that constitutes human voice.
In addition to being able to improve the sound pressure up to 5 KHz, the flat reproduction sound pressure frequency characteristics with few peak dips can be achieved, which is excellent in improving the intelligibility of voice that could not be realized with the conventional products. The acoustic characteristics can be realized, and the two reflectors can reduce the amount of the resin and the amount of the sound absorbing material of the acoustic tube, so that the speaker device which is superior in cost can be realized.

[Brief description of drawings]

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

FIG. 2 is a plan sectional view showing a configuration of a speaker device according to a second embodiment of the present invention.

FIG. 3 is a plan sectional view showing a configuration of a speaker device according to a third embodiment of the present invention.

FIG. 4 is a comparative characteristic diagram of reproduced sound pressure frequency characteristics of the speaker device of the present invention and reproduced sound pressure frequency characteristics of the conventional speaker device.

FIG. 5 is a plan sectional view showing a configuration of a conventional speaker device.

FIG. 6 is a structural conceptual diagram of a television receiver incorporating a speaker device using a conventional acoustic tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Acoustic tube 11 Sound absorbing material 12 First reflecting plate 13 Acoustic tube opening 14 Sound path 15 Speaker unit 16 Speaker vibrating part 17 Throat narrowing part 18 Edged rib 19 Gap between first reflecting plate and second reflecting plate 20 First Reflector end part 21 Second reflector start end 22 Second reflector 23 Cavity 24 Asymmetric second reflector 25 Asymmetric second reflector 26 Asymmetrically shaped second reflector 27 27 Asymmetrically shaped second reflection Plate 28 Cavity 29 Cavity 30 Sound pressure frequency characteristics of the speaker device of the present invention 31 Sound pressure frequency characteristics of conventional products

Claims (4)

[Claims] 1. An acoustic tube disposed in the front surface of a speaker for guiding a sound wave having a rectangular shape, and an end of a first reflection plate disposed from the front side of the speaker inside the acoustic tube toward the acoustic tube opening. A second reflecting plate arranged such that the starting end portion comes to the front of the first reflecting plate, and the first reflecting plate and the second reflecting plate have independent lengths, respectively, and the first reflecting plate and the second reflecting plate. The speaker device has a gap between it and the reflector so that it can communicate with the room of the sound absorbing material. 2. The speaker device according to claim 1, wherein the position of the second reflector is left-right asymmetric. 3. The speaker device according to claim 1, wherein the position of the second reflection plate is asymmetrical to the left and right and has a laterally different shape. 4. A television receiver including the speaker device according to claim 1, 2, or 3.