JPH0728457B2 - Speaker device and television receiver using the same - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device used in a video device such as a television receiver and an in-vehicle audio device, and a television receiver using the speaker device.

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 the opening can provide a larger output sound pressure than when a horn or an acoustic tube is not used. It has the advantage that sound can be transmitted in a specific direction, and has been widely used in the past. A speaker device using a conventional acoustic tube will be described below with reference to the drawings.

FIG. 7 is a structural conceptual diagram of a television receiver incorporating the above speaker device. In FIG. 7, 1 is a speaker for middle and low range reproduction, 2 is an acoustic tube to which the speaker 1 for middle and low range reproduction is attached, 3 is a television cabinet, and 4 is a cathode ray tube.

First, the operation of the television receiver incorporating the speaker device using the acoustic tube 2 configured as described above will be described. As shown in FIG. 7, a speaker device in which a sound tube 2 for guiding sound waves is arranged on the front surface of a speaker 1 for reproducing low and middle frequencies is built in along a cathode ray tube 4 inside a television receiver, and further, a television By making the cabinet 3 along the speaker device, the television receiver can be made compact and slim.

FIG. 8 is a structural conceptual diagram showing the configuration of the conventional speaker device. In FIG. 8, reference numeral 5 is an acoustic lens provided on the front surface of the low- and mid-range reproduction speaker 1, 7 is a hole for guiding the sound waves emitted from the mid-and-low range reproduction speaker 1 to the acoustic tube 2, and 6 is a hole. Reflectors provided on both sides of the hole 7, 9 are sound absorbing materials, and the acoustic tube 2 is a combination of an acoustic tube panel 8 and an acoustic tube cover 10 that constitute the majority of the acoustic tube 2 in the direction A. is there.

The operation of the speaker device configured as described above will be described below.

Acoustic lens 5 provided on the front surface of the speaker 1 for playing in the mid-low range
The reflection plate 6 is for improving the high frequency characteristics of the speaker device, and the sound absorbing materials 9 inserted on both sides of the reflection plate 6 are for suppressing standing waves generated inside the acoustic tube 2. Is. The acoustic tube 2 has a small area on the front surface of the speaker, and has a larger area as it approaches the opening.

9 and 10 are perspective views of a television receiver configured by using a speaker device for middle and low range reproduction and a speaker for high range reproduction which are constructed by using the acoustic tube. In FIG. 9, reference numeral 11 denotes an acoustic tube opening of the speaker device for low- and middle-frequency reproduction, and 12 denotes a high-frequency reproduction speaker installed above the acoustic tube opening 11. In addition, in the television receiver shown in FIG. 10, a high frequency reproduction speaker is used.
The configuration is such that 12 is placed in front of the acoustic tube opening 11 of the speaker device for reproducing the mid-low range. The operation of the speaker device of the television receiver shown in FIGS. 9 and 10 will be described below.

Generally, in the case of a speaker for high frequency reproduction, it is possible to reduce the size of the speaker, and in order to guide sound to the opening by a method similar to that of the speaker device for reproduction of middle and low frequencies using the acoustic tube, an acoustic In order to remove the standing wave generated inside the tube, it is necessary to properly arrange a sound absorbing material inside the tube, or in order to guide the high frequency component to the front of the opening without attenuating it, the internal structure of the tube is complicated. Due to such reasons, a method of installing a speaker for high frequency reproduction on the front surface of the television receiver has been used as a means for relatively easily making the television receiver compact.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described conventional configuration, since the installation positions of the speaker for middle and low range reproduction and the speaker for high range reproduction are largely different, the sound wave reproduced by the middle and low range reproduction speaker and the high frequency sound are reproduced. A phase difference with the sound wave reproduced from the range reproduction speaker occurs in each frequency band, and when viewed as the sound pressure frequency characteristics of the speaker device as a television receiver,
As shown in Fig. 13, in addition to the characteristics with many peak dips, the sound quality was also uncomfortable as a result of listening. Further, in the case of a television receiver in which the high-frequency reproduction speaker 12 is arranged on the upper surface of the low- and middle-frequency reproduction speaker shown in FIG. 9, in the case of the low- and middle-frequency reproduction speaker and the high-frequency reproduction speaker.
Since the 12 installation positions are different, there is a problem that the sound moves up and down in the middle and high range reproduction band, and eventually the sound image localization feeling and the intelligibility of the sound are poor and for high performance television receivers. The speaker device was not completely satisfactory.

The present invention solves the above-mentioned conventional problems. An acoustic tube for guiding a sound wave having a rectangular opening is arranged on the front surface of a speaker for mid-low range reproduction, and a speaker for mid-low range reproduction inside the acoustic tube. By arranging the speakers for high frequency reproduction close to each other on the same axis as the front part of the, it is possible to achieve excellent acoustic characteristics that improve the sense of sound localization and the intelligibility of sound that could not be achieved with conventional products. It is an object of the present invention to provide a speaker device capable of achieving the following.

Means for Solving the Problem In order to solve this problem, a speaker device of the present invention has an acoustic tube for guiding a sound wave having a rectangular opening at the front of a speaker for mid- and low-frequency reproduction. A cavity for arranging a high-frequency reproduction speaker in close proximity to the front part of the mid-low-frequency reproduction speaker, and guiding the sound waves of the mid-low-frequency reproduction speaker to both sides of the high-frequency reproduction speaker. Through
In addition, the sound absorbing material is arranged, and the opening area on the front of the speaker for mid-low range reproduction is coaxial with the front emission part of the speaker for mid-low range reproduction with respect to the effective radiation area of the speaker for mid-low range reproduction. A 20-50% smaller acoustic lens is placed by using the magnetic circuit part of the high-frequency reproduction speaker placed in close proximity, and the sound of the opening is smaller than the sound conduction area of the front part of the low- and mid-frequency reproduction speaker. The configuration is such that the area of the conductor is large.

Operation With this configuration, even in a speaker device having a horn or an acoustic tube whose opening is made into a long and thin rectangular shape in consideration of incorporation into a device, the speaker is placed inside the acoustic tube coaxially with the front part of the speaker for mid-low range reproduction. By arranging the high-frequency reproduction speakers close to each other, the attenuation of the mid-high frequency components reproduced by the mid-low frequency reproduction speakers is suppressed, and further, the high-frequency reproduction speakers placed close to each other on the same axis are used. The high-frequency component to be reproduced can be guided to the front of the opening of the acoustic tube as an acoustic signal that is synthesized in a state that is very close to the natural state, and a sound image localization feeling and clear sound that could not be achieved with conventional products. It is possible to achieve excellent acoustic characteristics with an improved degree of quality, which in turn makes it possible to make the television receiver compact and improve the sound quality.

Examples Examples of the present invention will be described below with reference to the drawings. The same reference numerals as those in FIGS. 7 to 11 denote the same parts.

FIG. 1 is a perspective view showing a partial cross-section of the configuration of a speaker device mainly including an acoustic tube portion according to an embodiment of the present invention. In FIG. 1, reference numeral 1 is a speaker for mid-low range reproduction,
An acoustic tube 2 for guiding a sound wave is arranged on the front surface of the low- and mid-range reproduction speaker 1 so as to have a narrow rectangular opening 11 in consideration of incorporation into a device. Also,
Inside the acoustic tube 2, a high-frequency reproduction speaker 12 is coaxially arranged on the front surface of the low- and middle-frequency reproduction speaker 1 in the vicinity thereof.
Further, a reflector 6 and a sound absorbing material 9 are arranged on both sides of the high-frequency reproducing speaker 12 via a cavity 14 for guiding the sound waves of the mid-low frequency reproducing speaker 1. .

FIG. 2 is a sectional view showing the configuration of the speaker device according to the embodiment of the present invention shown in FIG. In FIG. 2, reference numeral 15 denotes a magnetic circuit section of the high-frequency reproduction speaker 12, which is coaxially arranged on the front surface of the middle- and low-frequency reproduction speaker 1 as an acoustic lens of the middle- and low-frequency reproduction speaker 1. The area of the cavity 14 for guiding the sound wave on the front surface of the speaker 1 for mid / low range reproduction to the effective radiation area of the speaker 1 for mid / low range reproduction is 20
The structure is made smaller by -50%, and the sound conducting area of the opening 11 is made sufficiently larger than the area of the cavity 14 on the front surface of the low- and mid-range reproduction speaker 1.

The acoustic signal reproduced by the speaker device using the acoustic tube of the present invention configured as described above is arranged coaxially with the high-frequency reproducing speaker 12 coaxially on the front surface of the mid-low frequency reproducing speaker 1. With this configuration, the attenuation of the mid-high range component reproduced from the mid-low range reproduction speaker 1 is suppressed, and further, the high-range component reproduced from the high-range reproduction speaker 12 arranged coaxially close to each other, As a sound signal synthesized in a state that is very natural, it can be guided to the front surface of the opening 11 of the sound tube 2, and is seen as the sound pressure frequency characteristic of the speaker device as the television receiver. In this case, as shown by 16 in FIG. 3, it is possible to have a characteristic with a small peak dip, and the two speakers are arranged coaxially in close proximity to each other, so that the sound rises and falls in the mid-high range reproduction band. Moved to Rutoitta Such problems can be solved, in which conventional products in can achieve excellent acoustic characteristics with improved sound localization and speech intelligibility, which could not be realized.

The installation position of the high-frequency reproduction speaker 12 coaxially arranged on the front surface of the mid-low range reproduction speaker 1 is, as shown in FIG. For the length L1 from the mounting surface to the opening 11 of the acoustic tube 2, the length L2 from the mounting surface of the speaker 1 for playing in the mid-low range to the mounting surface of the speaker 12 for playing in the high range is set. The configuration is as follows.

The sound pressure frequency characteristics of the speaker device according to the present embodiment vary greatly depending on the installation position of the high frequency reproduction speaker 12, and for example, the mounting position of the high frequency reproduction speaker 12 is the opening 11 of the acoustic tube 2. As the sound pressure-frequency characteristic of the speaker device becomes closer to the direction of, the sound pressure decreases as shown in 17 of FIG. I will end up. This is the magnetic circuit part of the speaker 12 for high frequency reproduction.
This is because 15 does not work as an acoustic lens of the speaker 1 for playing in the mid-low range, and because the distance difference between the installation positions of the two speakers is large, the phase difference of the sound waves reproduced by the two speakers becomes large. This is because it tends to occur in the middle and high band reproduction bands.

Next, a second embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is a perspective view showing the configuration of the speaker device according to the second embodiment of the present invention. In FIG. 4, 18 is an acoustic tube in which the structure of the acoustic tube portion in the first embodiment of the present invention is constructed so as to be integrally molded, and 19 is the acoustic tube portion after the sound absorbing material 9 is inserted. Is a sound-absorbing material cover.

As described above, the speaker device having the structure capable of integrally molding the acoustic tube according to the second embodiment of the present invention can realize the speaker device having sufficient strength against the internal resonance of the acoustic tube. Therefore, the distortion of the sound generated by the internal resonance of the acoustic tube can be significantly reduced, and further, the integral molding can improve the dimensional accuracy of the acoustic tube. By incorporating the speaker device in the television receiver,
It is easy to realize a small and slim TV receiver,
In addition, the television receiver can be made highly reliable, and the workability of assembling the speaker device can be improved and the number of assembling steps can be significantly reduced.

It should be noted that the same effect can be obtained when the rear cabinet 20 and the bass reflex port 21 are provided in the speaker device constructed by the structure of the acoustic tube of the present invention as shown in FIGS. 5 and 6. Needless to say.

EFFECTS OF THE INVENTION As described above, according to the present invention, an acoustic tube for guiding a sound wave having a rectangular opening is arranged on the front surface of a speaker for mid-low range reproduction, and the front part of the speaker for mid-low range reproduction inside the acoustic tube. A loudspeaker for high-frequency reproduction is arranged in the vicinity of the same coaxial, and a sound absorbing material is arranged on both sides of the loudspeaker for high-frequency reproduction through cavities for guiding sound waves of the speaker for mid-low-frequency reproduction. age,
Further, a high-frequency reproduction speaker in which the opening area of the front surface of the low- and middle-frequency reproduction speaker is coaxially arranged on the front part of the low- and low-frequency reproduction speaker with respect to the effective radiation area of the low- and middle-frequency reproduction speaker. 20% to 50% smaller acoustic lens is arranged by using the magnetic circuit part of the above, and the sound conducting area of the opening is larger than the sound conducting area of the front part of the speaker for middle and low range reproduction. Due to the configuration, the attenuation of the mid-high range component reproduced from the mid-low range reproduction speaker is suppressed, and the high-range component reproduced from the high-range reproduction speaker arranged coaxially close to each other is very natural. As an acoustic signal synthesized in this state, it can be guided to the front surface of the acoustic tube opening, and has excellent acoustic characteristics that improve the sense of sound localization and the intelligibility of voice that could not be achieved with conventional products. And, by extension, TV The John receiver can be made compact and the sound quality can be improved. Further, since the acoustic tube can be integrally molded, distortion of sound generated by internal resonance of the acoustic tube can be significantly reduced, and further, the dimensional accuracy of the acoustic tube can be improved. By incorporating the speaker device of the invention in the television receiver, it is possible to easily realize the downsizing of the television receiver and to provide a highly reliable television receiver. It is possible to improve the assembly workability of the device and significantly reduce the number of assembly steps.

[Brief description of drawings]

FIG. 1 is a perspective view showing a partial cross-section of the structure of a speaker device according to a first embodiment of the present invention, and FIG. 2 shows a structure according to the first embodiment of the present invention shown in FIG. FIG. 3 is a sectional view, FIG. 3 is a sound pressure-frequency characteristic diagram when a speaker device using the acoustic tube of the present invention is incorporated in a television receiver, and FIG. 4 is a speaker in the second embodiment of the present invention. FIG. 5 is a perspective view showing the configuration of the device, and FIGS. 5 and 6 are perspective views showing an embodiment of a speaker device further developed by using the acoustic tube of the present invention shown in FIGS. 1 and 4. FIG. 7 is a structural conceptual diagram of a television receiver incorporating a speaker device using a conventional acoustic tube, and FIG. 8 is an exploded perspective view of a speaker device using a conventional acoustic tube, FIG. 9 and FIG. Ten
FIG. 11 is a perspective view of a television receiver configured by using a speaker device for mid- and low-frequency reproduction and a speaker for high-frequency reproduction that are configured by using the conventional acoustic tube, and FIG. 11 is a conventional acoustic tube. It is a sound pressure-frequency characteristic figure when the speaker apparatus used is built into a television receiver. 1 …… Speaker for middle and low range reproduction, 2 …… Sound tube, 6 …… Reflector, 9 …… Sound absorbing material, 11 …… Opening part, 12 …… Speaker for high range reproduction, 14 …… Middle and low range reproduction Cavity for guiding sound waves from a speaker for reproduction, 15 ... Magnetic circuit part of speaker for high frequency reproduction, 16
...... Sound pressure-frequency characteristic diagram when a speaker device using the acoustic tube of the present invention is built in a television receiver, 18 ...
Sound tube constructed in a structure that can be integrally molded, 19 ... Sound absorbing material cover, 20 ... Rear cabinet, 21 ... Bass reflex port.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Asahiko Okada 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Hiroshi Koshiishi 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (56) References Japanese Unexamined Patent Publication No. 2-312393 (JP, A) Japanese Unexamined Patent Publication No. 1-135295 (JP, A) No. 56-11562 (JP, U) No. 55-24871 (JP, U)

Claims (3)

[Claims] 1. A sound tube for guiding a sound wave having a rectangular opening is arranged in front of a speaker for mid- and low-frequency reproduction, and high-frequency reproduction is carried out coaxially with the front part of the speaker for mid-and-low-frequency reproduction inside the sound tube. Speakers are placed close to each other, and a sound absorbing material is arranged on both sides of the high-frequency reproduction speaker via cavities for guiding the sound waves of the low- and low-frequency reproduction speaker. The magnetic circuit section of the high-range reproduction speaker is arranged in such a manner that the opening area of the front of the middle- and low-range reproduction speaker is arranged coaxially with the front part of the middle- and low-range reproduction speaker in proximity to the effective radiation area of the reproduction speaker. A speaker device in which an acoustic lens reduced in size by 20 to 50% is also used in combination, and the sound conducting area of the opening is larger than the sound conducting area of the front surface of the speaker for mid- and low-frequency reproduction. 2. The speaker device according to claim 1, wherein the acoustic tube is integrally molded. 3. A television receiver including the speaker device according to claim 1 or 2.