JPH08214393A - Speaker device - Google Patents

Abstract

PURPOSE: To provide the speaker device of improved characteristics at a low cost by solving the rise of the cost due to the disturbance of the characteristics and a sound absorbing material in the speaker device utilized for a television receiver or the like. CONSTITUTION: A speaker 10 is inclined toward the side of a rectangular opening part 22 for more than 50 degrees and connected to a sound tube 11 and plural reflection plates 19 to 21 are provided inside the sound tube 11. A part of the reflection plates 19 to 21 is notched, a sound path 16 is constituted through a space part 12 surrounded by the reflection plates and further, the reflection plate 17 whose are is 10 to 20% of the diaphragm area of the speaker 10 is provided on the front surface of the speaker 10. Thus, the disturbance of the characteristics by standing waves is suppressed, the sound pressure decline of middle and high bands is suppressed since the sound absorbing material is not used and the sound clarity is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device which is used in a video device such as a television receiver and has an acoustic tube connected to a front surface of a speaker for guiding a sound wave.

[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. 4 is a structural conceptual diagram of a television receiver incorporating the above speaker device.
In FIG. 4, 1 is an acoustic tube, 8 is a speaker, 26 is a television cabinet, 27 is a cathode ray tube, and 28 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. 4, a speaker device, in which an acoustic tube 1 for guiding sound waves is arranged on the front surface of a speaker 8, is built in along with a cathode ray tube 27 inside a television receiver, and a television cabinet 26 is provided as described above. By making the structure along with the speaker device, the television receiver can be made smaller and slimmer.

FIG. 5 is a plan sectional view showing the structure of the conventional speaker device. In FIG. 5, 8 is a speaker for generating sound waves, 2 and 3 are reflectors provided on both sides of the front surface of the speaker 8, and 6 is a sound absorbing material.

The operation of the speaker device using the conventional acoustic tube 1 configured as described above will be described below.

Acoustic tube 1 attached to the front of speaker 8
The sound absorbing material 6 is arranged to suppress the standing wave generated inside, and the reflection plate 2, for adjusting the amount of sound waves absorbed by the sound absorbing material 6 to correct the mid-range characteristics. 3 is provided, which enables natural sound reproduction through the opening 5 of the acoustic tube 1 which is elongated and has a substantially rectangular shape.

[0009]

However, in the above conventional structure, the sound absorbing material 6 is inserted into the acoustic tube 1 in order to suppress the standing wave generated inside the acoustic tube 1 as shown in FIG. However, there is a problem that the sound absorbing material 6 absorbs the sound waves of the middle and high frequency components and the output sound pressure is lowered. Although the reflectors 2 and 3 are provided for the purpose of preventing this phenomenon, they are not enough to prevent the sound pressure drop in the middle and high ranges, and the reproduced sound pressure frequency characteristics are disturbed and there are many peak dips. There was also a problem that it became a characteristic and the clarity of the voice was lowered.

Further, in order to suppress the standing wave, the sound absorbing material 6 has to be used in a large amount, is costly, and the volume of the room into which the sound absorbing material 6 is inserted must be secured, so that the acoustic tube 1 is made slim. There was also a limit.

Further, since the acoustic tube 1 is made of a resin material, if the molding state is poor, warping of the opening 5 of the acoustic tube 1 may occur, resulting in a decrease in output sound pressure. Further, there is a limit to the angle of the rectangular shape from the viewpoint of acoustic effect, even when it is attached to the television receiver, and it is arranged on the side surface of the cathode ray tube 27.

The present invention is intended to solve the above-mentioned conventional problems, aiming at further slimening of the acoustic tube, improving the clarity of voice and improving the output sound pressure, and further making the reproduced sound pressure frequency characteristic flat. It is an object of the present invention to provide a speaker device having excellent acoustic characteristics.

[0013]

In order to solve this problem, a speaker device of the present invention has an elongated rectangular opening portion, and a speaker mounting surface inclined by 50 degrees or more toward the opening portion. An acoustic tube for guiding a sound wave having
The acoustic tube includes a speaker whose front surface is coupled to the speaker mounting surface and a rear cover which is coupled to the rear surface side of the acoustic tube so as to cover the rear side of the speaker and form a space. The sound path that guides the sound waves emitted from the speaker to the opening is formed in such a way that the area is small in the front part of the speaker and increases as the area approaches the opening. Is provided and a plurality of reflectors that also serve to reinforce the acoustic tube are provided, and the sound path formed by the reflectors provided on both sides of the plurality of reflectors and the side wall of the acoustic tube is the speaker. It is configured so as to communicate with the space formed in the rear of the.

[0014]

With this configuration, even in a speaker device having a horn or an acoustic tube whose opening is an elongated rectangular shape in consideration of incorporation into a device, a plurality of reflecting plates are provided inside the acoustic tube, and a part of the reflecting plate is provided. 500 to 5 KHz, which is an important frequency band that constitutes human voice, by absorbing the standing wave by resonating by making a structure in which the space surrounded by the reflector and the sound path communicate with each other by cutting out the 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 changing the size of the space and the combination of the notch width and length of the reflector, it is possible to suppress the standing waves generated inside the acoustic tube and make the acoustic characteristics flat. Sound pressure does not decrease compared to the method of suppressing standing waves generated inside the acoustic tube by using the sound absorbing material used in the speaker device of the above, and a large volume for inserting the sound absorbing material is secured. Of course, the acoustic tube can be slimmed down.

Further, by forming a sound path consisting of a reflection plate and a side wall of the acoustic tube at both ends of the acoustic tube and communicating with a space on the rear surface of the speaker, a sound wave generated on the rear surface of the speaker is guided to the front surface of the acoustic tube and has a small volume. With this, richer bass reproduction can be realized.

[0016]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway perspective view of the speaker device according to the embodiment. In FIG. 1, 10 is a speaker for full band reproduction, 11 is an elongated rectangular opening in consideration of incorporation into a device. 22 and this opening 2
Reference numeral 23 denotes an acoustic tube which guides a sound wave to which the speaker 10 is coupled by inclining the mounting surface toward the 2 side by 50 degrees or more, and 23 is a rear surface cover which is coupled to the rear surface side of the acoustic tube 11 and covers the rear surface side of the speaker 10.

The inside of the acoustic tube 11 is the speaker 1
Sound path 1 for guiding sound waves emitted from 0 to the opening 22
The fourth to sixth reflectors 1 having different lengths that configure the acoustic characteristics 5 and 16 and also serve to correct the acoustic characteristics and reinforce the acoustic tube 11.
9 to 21 are installed, and the sound paths 13 and 14 constituted by the side wall of the acoustic tube 11 and the second and third reflectors 5 and 6 arranged on both sides are the rear covers of the speakers. Two
3 has a structure leading to a space formed by 3,
Further, a first reflection plate 17 having an area of 10 to 20% of the diaphragm area is installed in parallel with the speaker 10 on the front surface of the diaphragm of the speaker 10, and the gap 18 is provided in the acoustic tube 1.
The structure is such that it communicates with the space 12 surrounded by the second and third reflectors 5 and 6 arranged in the acoustic tube in order to remove the standing wave in 1.

The operation of the speaker device of the present invention constructed as above will be described. First, when an input signal is applied to the speaker 10 for full-band reproduction, sound waves pass through the sound paths 15 and 16 inside the sound tube 11 and the sound tube opening 22.
At that time, two sound paths 15 and 16 formed by the fourth reflector 19 and the two fifth and sixth reflectors 20 and 21 having different shapes are provided to separate specific frequencies. The band sound pressure can be emphasized.

The suppression of the standing wave generated by the length of the acoustic tube 11 is absorbed by the resonance phenomenon generated by the combination of the space 12 and the gap 18 having a distance so as to communicate with the space 12. In addition, it is possible to comprehensively control the mid-high range reproduction band and improve the sound pressure in the mid-high range, which is an important frequency band that constitutes human voice.

Further, the sound wave radiated from the rear surface of the speaker 10 wraps forward by the rear cover 23, and the acoustic tube 1
Side wall 1 and second and third reflectors 5 and 6 provided on both sides
The sound pressure is radiated to the opening 22 of the acoustic tube 11 through the sound paths 13 and 14 constituted by and, and it is possible to improve the sound pressure in the low frequency range.

Further, the first reflector 17 having an area of 10 to 20% of the diaphragm area on the front surface of the speaker 10 and arranged in parallel to the speaker 10 enables correction of high frequency sound pressure. It will be.

Further, the sound pressure frequency characteristic 25 of the speaker device according to the present embodiment is shown in FIG. 2 together with the sound pressure frequency characteristic 24 of the conventional speaker device.

As can be seen from FIG. 2, the space portion 12
By arranging the gaps 18 having a distance so as to communicate with the space portion 12 in combination, the standing wave inside the acoustic tube 11 is suppressed, and at the same time, as shown by 25 in FIG. It is possible to achieve high sound pressure characteristics in the middle and high frequencies, improve the intelligibility of voice and flatten the reproduced sound pressure frequency characteristics, which could not be realized in the past, and further eliminate sound absorbing materials, and have excellent acoustic characteristics. Can be realized.

Further, by incorporating the speaker device of the present invention into a television receiver as shown in FIG. 3, it is possible to easily realize the downsizing of the television receiver and the further slim design, and also the high performance and high performance. It is possible to make a television receiver with high sound quality.

[0026]

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 ~ 5KHz, it is also possible to completely absorb the standing wave from the length of the tube by using resonance, so the flat reproduction sound pressure with less peak dips. Can achieve frequency characteristics, and realizes excellent acoustic characteristics that improve the clarity of voice even when the speaker is installed at a steep angle of 50 degrees or more with respect to the opening, which was not possible with conventional products. In addition, since the speaker mounting angle and sound absorbing material are not used, a slimmer and minimum size speaker device can be realized.

[Brief description of drawings]

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

FIG. 2 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. 3 is a structural conceptual diagram of a television receiver incorporating the speaker device of the present invention.

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

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

[Explanation of symbols]

 5 Second Reflector 6 Third Reflector 10 Speaker 11 Acoustic Tube 12 Space 13, 13, 15, 16 Sound Path 17 First Reflector 18 Gap 19 Fourth Reflector 20 Fifth Reflector 21 Sixth reflector 22 Opening 23 Rear cover

Claims (4)

[Claims] 1. An acoustic tube for guiding a sound wave having an elongated rectangular opening and having a speaker mounting surface inclined to the opening side by 50 degrees or more, and to the speaker mounting surface of the acoustic tube. It consists of a speaker whose front surface is combined and a rear cover which is connected to the rear surface side of the acoustic tube so as to cover the rear surface side of the speaker and form a space. Is small,
A sound path that guides the sound waves radiated from a speaker whose area increases toward the opening to the opening, and a plurality of sound paths that divide the sound path to correct the acoustic characteristics and also serve to reinforce the acoustic tube. Of the plurality of reflectors, and the sound paths formed by the reflectors provided on both sides of the plurality of reflectors and the side wall of the acoustic tube communicate with the space formed behind the speaker. Apparatus configured as described above. 2. The speaker device according to claim 1, wherein the plurality of reflectors provided inside the acoustic tube have different lengths. 3. The method according to claim 1, wherein a part of a plurality of reflectors provided inside the acoustic tube is cut out, and a space communicating with the notches is formed by the reflector. Speaker device. 4. The area of the diaphragm of the speaker is 10 to 2
The speaker device according to any one of claims 1 to 3, wherein a reflector formed in an area of 0% is arranged in the vicinity of the front surface of the speaker.