JPH11341582A - Speaker device for television receiver and television receiver to which speaker device for television receiver is applied - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker device for a television receiver by which a reproduced sound filled with presence is obtained with a simple structure by using one speaker. SOLUTION: This speaker device 10 for a television receiver is constituted by mounting one speaker 21 in a speaker cabinet 22 mounted between the side face in a main body casing of and the side face of a cathode-ray tube of the television receiver, providing a sound guiding horn 22c in front of the speaker 21 and surrounding the rear side of the speaker 21 by a speaker box 22b for resonance. The speaker box 22b is provided with plural bus-reflex ports 22e, 22f with different radiating directions of sound so that a difference is made between effective mass and mechanical resistance as impedance owned by each of the plural bus-reflex ports 22e, and 22f.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device for a television receiver and a television receiver to which the speaker device for the television receiver is applied.

[0002]

2. Description of the Related Art In recent years, television receivers compatible with high image quality have been actively developed, and accordingly, speaker devices for television receivers applied to this type of television receiver compatible with high image quality. Requires high sound quality.

FIG. 10 is a plan view showing a general speaker device for a television receiver as an example of a conventional example. In FIG. 10, a cathode ray tube 52 is mounted in a main body casing 51 of the television receiver 50.
Further, between the left and right sides of the main body housing 51 of the television receiver 50 and the left and right sides of the cathode ray tube 52, the speaker device 60 (60L, 60R) for the television receiver is connected to Lc.
They are mounted substantially symmetrically for h and Rch. Here, the above-described speaker device 60 for a television receiver is used.
Has one speaker 61 mounted on a speaker mounting plate 62a in a speaker cabinet 62, and
The speaker 61 is mounted via a speaker cabinet 62 near the neck 52a of the cathode ray tube 52 at a position farther away from the front surface 51a of the main body casing 51. Also,
The speaker cabinet 62 has a sound path horn (sound tube, sound tube) 62b having a rectangular cross section extending from the front surface of the speaker mounting plate 62a on which the speaker 61 is mounted, along the side of the cathode ray tube 52 toward the front surface 51a of the main body housing 51. And the rear of the speaker 61 is surrounded by a speaker box 62c for resonance. At this time, the area of the radiation surface portion 62b1 on the speaker 61 side generally corresponds to the sound path horn 6
The area is larger than the area of the opening end 62b2 on the audio output side of 2b.

On the other hand, utility model registration number 2531768
FIG. 11 discloses a stereophonic speaker system for audio-visual equipment using a cathode ray tube including a main (main) speaker and a sub-speaker as shown in FIG.

FIG. 11 is a perspective view showing a stereophonic speaker system for audio-visual equipment using a cathode ray tube of another example in a conventional example. In FIG. 11, a cathode ray tube 72 is mounted in a main body casing 71 of the television receiver 70. Also, a television receiver speaker device 80 (80L, 80L) is provided between the left and right sides of the main body housing 71 of the television receiver 70 and the left and right sides of the cathode ray tube 72.
80R) are installed substantially symmetrically for Lch and Rch. Here, in the above-described speaker device 80 for a television receiver, a main (main) speaker 81 is mounted on a speaker mounting plate 82a in a speaker cabinet 82, and the main speaker 81 is mounted on a main body casing 71.
A speaker cabinet 82 is mounted near the neck 72a of the cathode ray tube 72 at a position farther away from the front surface 71a. In addition, the speaker cabinet 82 is configured such that the sound path horn 82b is attached to the front surface 71a
While forming along the side of the cathode ray tube 72 toward
The rear of the main speaker 81 is surrounded by a speaker box 82c for resonance. Further, the speaker box 82c
A baffle plate 83 is attached to an extended position on the side surface of the baffle plate, and a sub-speaker 84 for sound field generation is attached to the baffle plate 83, and a combination of the main speaker 81 and the sub-speaker 84 obtains a reproduced sound full of a sense of reality.

[0006]

In a general speaker device 60 for a television receiver as shown in FIG. 10, a speaker 61 is connected to an output side of a sound path horn 62b formed in front of a speaker cabinet 62. The sound path horn is installed at a position behind the open end portion 62b1 and the sound from the speaker 61 is formed such that the area of the radiation surface portion 62b1 on the speaker 61 side is larger than the area of the open end portion 62b2 on the sound output side. Since the sound is output through the signal line 62b, it is difficult to flatten the output sound pressure characteristic from the low band to the high band of the sound band, and it is difficult to reproduce a natural sound. The reason for this is that the speaker 61 is arranged near the neck 52a of the cathode ray tube 52 due to the structural limitation, and the speaker 6 is connected via the sound path horn 62b having a rectangular cross section.
Since the sound from No. 1 is output from the opening end 62b1, the sound path horn 62b in front of the speaker 61 cuts the high range and acts as a low-pass filter. In this case, as the ratio of the area of the opening end of the sound path horn 62b / the area of the radiation surface of the speaker 61 becomes smaller than 1, the low-pass characteristic tends to be deteriorated.

On the other hand, in the stereophonic speaker system 70 for audio-visual equipment as shown in FIG. 11, although a reproduction sound full of a sense of reality can be obtained by a combination of the main speaker 81 and the sub-speaker 84, the two speakers 81, 84 FIG.
Has the same problems as the television receiver speaker device 60 described above, and it is difficult to reproduce natural sounds. Further, since two speakers 81 and 84 are required, there is a problem that the cost is increased.

Therefore, there is a demand for a speaker device for a television receiver capable of obtaining a reproduced sound full of a sense of reality with a simple structure using a single speaker.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made in a speaker cabinet attached between a side of a main body of a television receiver and a side of a cathode ray tube. Attach one speaker,
A sound guide horn is provided in front of the speaker, and in a speaker device for a television receiver in which the rear of the speaker is surrounded by a speaker box for resonance, a plurality of bass reflex ports having different sound emission directions are provided in the speaker box. In addition, there is provided a speaker device for a television receiver, wherein the effective mass and the mechanical resistance as impedances of the plurality of bass reflex ports are respectively different.

In the speaker device for a television receiver according to the present invention, the plurality of bass reflex ports include a first bass reflex port protruding forward in the main housing, and an upper or side in the main housing. And a second bass reflex port protruding in the direction.

Further, in the speaker device for a television receiver according to the present invention, the impedance of the first bass reflex port is set to be larger than the impedance of the second bass reflex port.

Further, there is provided a television receiver to which the speaker device for a television receiver according to the above invention is applied.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a speaker device for a television receiver according to the present invention and a television receiver to which the speaker device for the television receiver according to the present invention is applied will be described with reference to FIGS. This will be described in detail.

FIG. 1 is a perspective view showing a speaker device for a television receiver according to the present invention and a television receiver to which the speaker device for the television receiver is applied.
FIG. 3 is a perspective view showing a speaker device for a television receiver according to the present invention, and FIGS. 3A and 3B are a side view and a bottom view showing the speaker device for a television receiver according to the present invention;
FIG. 4 is a diagram showing frequency characteristics when a pressure adjusting air vent slit is not provided in the speaker cabinet. FIG. 5 is a diagram illustrating a pressure adjusting air vent slit provided in the speaker cabinet and the air vent slit is covered with a sound absorbing material. FIG. 6 is a diagram showing the frequency characteristics of the speaker cabinet, and FIG. 6 is a diagram for explaining the sound pressure characteristics of the speaker cabinet.
Fig. 7 shows a case in which a pressure adjusting air vent slit is not provided in the speaker cabinet, Fig. 7 (B) shows a case in which a pressure adjusting air vent slit is provided in the speaker cabinet, and Fig. 7 shows a television receiver according to the present invention. FIG. 8 is a diagram showing a mechanical equivalent circuit of a speaker device for a vehicle, and FIG.
FIG. 9B shows the impulse response characteristics of the first and second bass reflex ports, and FIGS. 9A and 9B show the impedance characteristics and the total impedance characteristics of the first and second bass reflex ports. FIG.

As shown in FIG. 1, a television receiver 1
A cathode ray tube 12 is mounted in the main body housing 11 of the CRT. Also, the main body housing 11 of the television receiver 10
Between the left and right sides of the inside and the left and right sides of the cathode ray tube 12, the speaker device 20 (2) for a television receiver according to the present invention.
0L, 20R) are mounted substantially symmetrically for Lch and Rch. At this time, a sound path horn 22c and a first bass reflex port 22 are provided in the speaker cabinet 22 of the television receiver speaker device 20 as described later.
e, the second bass reflex port 22f is formed so as to be able to output sound from the speaker in the direction of the arrow.

Here, as shown in FIGS. 2 and 3A and 3B, in the above-described speaker device 20 for a television receiver, one speaker 21 is mounted inside a speaker cabinet 22. Have been.

The speaker cabinet 22 is formed by being divided into two parts by using a resin material, and is integrally assembled in the shape shown in the figure by closing the front part and the rear part. .

That is, in the speaker cabinet 22, a speaker mounting plate 22a is formed in a rectangular shape at an intermediate portion inside the speaker cabinet 22, and one speaker 21 fits into a center hole 22a1 formed in the center of the speaker mounting plate 22a.
Is mounted on the rear side of the speaker mounting plate 22a. The rear of the speaker 21 is surrounded by a speaker box 22b for resonance. At this time, the speaker 21
As shown in FIG. 1, the cathode ray tube 1 is located at a position farther away from the front surface 11a of the main body 11 of the television receiver 10.
A speaker cabinet 22 is attached near a second neck (not shown).

On the front side of the speaker mounting plate 22a of the speaker cabinet 22, a sound path horn 22c is aligned with the center hole 22a1 in the main body housing 11 (FIG. 1).
Is inserted between the side of the main body 11 and the side of the cathode ray tube 12 (FIG. 1). At this time, although the cut surface cut at an appropriate position is formed in a rectangular shape, the sound path horn 22c has an area of the cut surface halfway between the radiating surface portion 22c1 on the speaker 21 side and the opening end portion 22c3 on the sound output side. Is formed, and the area of the opening end 22c3: the area of the aperture 22c2: the area of the radiation surface 22c1 =
1: 1/2: 1 is set. The frequency characteristics realized by these ratios cannot be averaged as shown in FIG. 4 when the speaker cabinet 22 is not provided with an air vent slit 22d for pressure adjustment, which will be described later. The impedance characteristic of the speaker device 10 for use has a simple shape, and the level balance between the low band and the middle band is good. At this point, 200Hz
There is an excitement of the characteristic at
There is a wide dip between Hz and 800 Hz.

Here, the rise of the characteristic due to resonance is as follows.
This is because the sound pressure distribution of the sound path horn 22c is not like normal sound wave propagation. The cause is that the sound pressure of the portion where the sound path horn 22c is narrowed (throttle portion 22c2) is caused by air release for pressure adjustment. In the case where the slit 22d is not provided in the speaker cabinet 22, the size may be large as shown in FIG. 5A or the presence of a standing wave may be considered. No.
Therefore, in order to reduce the rise in sound pressure (pressure rise), the problem can be solved by adding an impedance close to that of air near the region where the sound pressure is highest. Specifically, near the region where the sound pressure is high, in the vicinity of the position where the cross-sectional area of the sound path horn 22c is minimum (throttle portion 22c2), as shown in FIG. By closing the air vent slit 22d with a sound absorbing material close to wool or the like having impedance so as to regulate the flow of air, as shown in FIG. The portion where the sound pressure was high (near the narrowed portion 22c2) was alleviated, and as a result, a substantially flat frequency characteristic from a low band to 800 Hz was realized as shown in FIG. In addition, FIG.
In the sound pressure display shown in (B), since the original image recorded in color is converted into a black and white image, a portion where the sound pressure is low is displayed in black when a portion where the sound pressure is high is displayed in a black color. The part corresponding to the sound pressure value is indicated by an arrow.

Next, a plurality of bass reflex ports 22e and 22f are provided in the speaker cabinet 22 to enhance bass sound. These plurality of bass reflex ports 22e, 22f
Is to increase Q (sharpness) by resonance between the effective impedance of the speaker itself and the volume of the speaker box 22b behind and increase the output of a certain frequency in a low frequency range by making the impulse response relatively long. Can be done.

More specifically, the first bass reflex port 22e
Is a center hole 22a on the front side of the speaker mounting plate 22a.
A cylindrical projection is formed from a position deviated laterally from 1 toward the front of the main body housing 11 (FIG. 1).
The first bass reflex port 22e has a small diameter and a single length without contacting the cathode ray tube 12 (FIG. 1). Of course, the first bass reflex port 22e passes through a hole (not shown) of the speaker mounting plate 22a and communicates with the inside of the speaker box 22b for resonance.

On the other hand, the second bass reflex port 22f is connected to the main body casing 11 (FIG. 1) from the speaker box 22 for resonance.
, Or a cylindrical shape protruding toward the side of the main body housing 11 (FIG. 1). At this time, the second bass reflex port 22f has a large diameter and a long length. I have.

The speaker cabinet 22 having the first and second bass reflex ports 22e and 22f formed as described above.
Is mounted between the left and right sides of the main body housing 11 and the left and right sides of the cathode ray tube 12, as shown in FIG.
The sound is directed forward from the two first bass reflex ports 22e.
The sound is output upward or to the side from the second bass reflex port 22e of the book. In FIG. 1, Lch, Rc
The same speaker cabinet 22 is used for both the h speaker cabinet 22 and the Rch (right) speaker cabinet 22 for the Lch (left) speaker cabinet 22 when assembling the speaker cabinet 22 into two parts. The front part where the first bass reflex port 22e is formed is turned upside down on the left and right, and the rear part where the second bass reflex port 22f is formed is covered with the lid.

At this time, from the experimental result that the radiation from the first bass reflex port 22e located on the front side has a large influence on the sound reproduction, the impedance of the first bass reflex port 22e is changed from the second bass reflex port 22f by the second bass reflex port 22f. By setting a large value, low-pitched sound reproduction with a sense of volume and power and without impairing clarity has become possible. That is, the effective mass and the mechanical resistance as impedances (effective impedances) of the first and second bass reflex ports 22e and 22f are different from each other.

Here, the first and second bass reflex ports 22
The numerical values of the effective mass and the mechanical resistance of e and 22f are as follows.

M1: Effective mass of the first bus reflex port 22e M2: Effective mass of the second bus reflex port 22f R1: Mechanical resistance of the first bus reflex port 22e R2: Mechanical resistance of the second bus reflex port 22f It suffices if the condition of M1 ≧ M2, R1> R2 is satisfied. At this time, in the embodiment, M1 = 11 × 10
⁻³ kg, M2 = 7 × 10 ⁻³ kg By setting R1 = 1.45 machine Ω and R2 = 0.8 machine Ω, the mechanical equivalent circuit of the television receiver speaker device (system) 10 becomes As shown in FIG. Further, as shown in FIGS. 8A and 8B, the impulse response characteristics of the first bass reflex port 22e are clear and have less reverberation because the impulse response is short, while the impulse response characteristics of the second bass reflex port 22f are small. Since the impulse response characteristic has a long impulse response, a rich and lingering characteristic can be obtained. In addition, the impedance characteristics and the total impedance characteristics of the first and second bass reflex ports have the characteristics shown in FIGS. 9A to 9C. Further, the first bass reflex port 22e facing forward allows bass reproduction without adversely affecting the damped audio band, while the second bass reflex port facing upward or sideways. From 22f, powerful low-pitched sound reproduction became possible.

When the above-configured speaker device for a television receiver according to the present invention is applied to a television receiver, a high-quality sound with a sense of reality is provided along with the improvement of the image quality of the image. can do.

[0029]

According to the speaker device for a television receiver according to the present invention described in detail above, a reproduced sound full of a sense of realism can be obtained with a simple structure using a single speaker.
The plurality of bass reflex ports have a Q value due to resonance between their own effective impedance and the volume of the speaker box behind them.
By increasing the (sharpness) and making the impulse response relatively long, it is possible to increase the output of a certain frequency in the low frequency range.

Further, when a plurality of bass reflex ports are constituted by a first bass reflex port protruding forward in the main body casing and a second bass reflex port protruding upward or laterally in the main casing. The first bass reflex port facing forward allows bass reproduction without adversely affecting the damped sound band, while the second bass reflex port facing upwards or sideways allows Powerful bass reproduction becomes possible.

According to the television receiver to which the speaker device for a television receiver according to the present invention is applied,
As the image quality of a video becomes higher, it is possible to provide high-quality sound with a sense of realism.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a speaker device for a television receiver according to the present invention and a television receiver to which the speaker device for the television receiver is applied.

FIG. 2 is a perspective view showing a speaker device for a television receiver according to the present invention.

FIGS. 3A and 3B are a side view and a bottom view showing a speaker device for a television receiver according to the present invention.

FIG. 4 is a diagram illustrating a frequency characteristic when a pressure adjusting air vent slit is not provided in a speaker cabinet.

FIG. 5 is a diagram showing a frequency characteristic in a case where an air vent slit for adjusting pressure is provided in a speaker cabinet and the air vent slit is closed with a sound absorbing material.

6A and 6B are diagrams for explaining the sound pressure characteristics of the speaker cabinet, wherein FIG. 6A shows a case where the speaker cabinet is not provided with an air vent slit for pressure adjustment, and FIG.
FIG. 4 is a diagram showing a case where a pressure release air vent slit is provided in a speaker cabinet.

FIG. 7 is a diagram showing a mechanical equivalent circuit of the speaker device for a television receiver according to the present invention.

FIGS. 8A and 8B are diagrams showing impulse response characteristics of first and second bass reflex ports.

FIGS. 9A and 9B are diagrams showing impulse response characteristics and total impulse response characteristics of first and second bass reflex ports.

FIG. 10 is a plan view showing a general speaker device for a television receiver as an example of a conventional example.

FIG. 11 is a perspective view showing a stereophonic speaker system for audio-visual equipment using a cathode ray tube of another example in a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Television receiver, 11 ... Main body housing, 12 ... CRT, 20 (20L, 20R) ... Television receiver speaker apparatus. Reference numeral 21: speaker, 22: speaker cabinet, 22b: speaker box, 22c: sound path horn, 22e: first bass reflex port, 22f: first bass reflex port.

Claims (4)

[Claims] 1. A speaker is mounted in a speaker cabinet mounted between a side of a main body of a television receiver and a side of a cathode ray tube, and a sound guide horn is provided in front of the speaker. In a speaker device for a television receiver in which a rear of a speaker is surrounded by a speaker box for resonance, a plurality of bass reflex ports having different sound emission directions are provided in the speaker box, and impedances of the plurality of bass reflex ports are respectively provided. A speaker device for a television receiver, characterized in that the effective mass and the mechanical resistance are different. 2. A plurality of bass reflex ports, the first bass reflex port protruding forward in the main body housing,
The speaker device for a television receiver according to claim 1, further comprising a second bass reflex port protruding upward or laterally in the main body housing. 3. The speaker device according to claim 2, wherein the impedance of the first bass reflex port is set to be larger than the impedance of the second bass reflex port. 4. A television receiver to which the speaker device for a television receiver according to claim 1 is applied.