JPH1169474A - Speaker device for thin type television - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker for a thin type television capable of sufficiently reproducing low-frequency sound at a low cost by arranging a speaker cabinet on the inner side of the back surface outer periphery of a panel in a square shape. SOLUTION: The thickness of a plasma display PDP panel 2 is about 10 cm and it is required to have the thickness of the speaker cabinet 1 about 5 cm. Thus, the speaker unit 4 of an extremely thin type is used and incorporation is made possible. The speaker cabinet 1 is arranged in the square shape along the inner side of the back surface outer periphery so as to be put around a power source circuit 3 arranged near the center part of the back surface of the PDP panel 2. The internal space of the speaker cabinet 1 is constituted of plural room parts respectively provided with prescribed width and depth for functioning as a low-frequency sound acoustic tube resonating to 50-120 Hz. Thus, sound emitted from a speaker unit 4 is efficiently reproduced to a low frequency and the speaker unit 4 is incorporated in an extremely thin type television.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a speaker device for a flat-screen television.

[0002]

2. Description of the Related Art Conventionally, in a flat panel display television, speakers are mounted on both sides of a normal panel for reproduction. However, the thickness of the panel is small, and the width of a cabinet is set so as not to protrude too much on both sides. Due to the limitations, it was not possible to reproduce sufficiently low frequencies. Therefore, when low-frequency reproduction is required, it is necessary to separately install the subwoofer in a place different from the panel.

[0003]

In the above-mentioned conventional configuration,
For bass reproduction, a separate subwoofer had to be provided, but in that case, there were problems that the space-saving effect of the panel display television was impaired and the connection became troublesome.

[0004] It is an object of the present invention to provide a speaker device for a flat-screen television which solves the above-mentioned conventional problems.

[0005]

According to a first aspect of the present invention, there is provided a speaker device for a thin panel display television, wherein the speaker device is mounted on a thin panel display television. The speaker cabinets are arranged along.

According to a second aspect of the present invention, there is provided a speaker apparatus for a flat-screen television according to the first aspect of the present invention, wherein the speaker cabinet is provided along an outer periphery of a back surface of the panel. It is characterized by being formed in a character shape.

According to a third aspect of the present invention, there is provided a speaker apparatus for a thin television according to the first aspect of the present invention, wherein the speaker cabinet has a concave shape along an outer periphery of a back surface of the panel. It is characterized by being formed in.

According to a fourth aspect of the present invention, there is provided a speaker apparatus for a flat-screen television according to the fourth aspect, wherein the speaker apparatus for a flat-screen television according to the first, second or third aspect is provided at an arbitrary position in the internal space of the speaker cabinet. The speaker unit is attached, and an external sound emission opening is provided at a predetermined position.

According to a fifth aspect of the present invention, there is provided a speaker apparatus for a thin television according to the fifth aspect of the present invention, wherein the speaker apparatus is directly discharged downward to the bottom of the speaker cabinet. A sound speaker unit is provided.

According to a sixth aspect of the present invention, there is provided a speaker apparatus for a flat panel television according to the fourth aspect, wherein the inside of the speaker cabinet is discharged to the front side of the speaker unit. And the sound emitted to the rear side is divided after passing through different routes, and is synthesized so as to be emitted to the outside of the cabinet from the external sound emission opening.

According to a seventh aspect of the present invention, there is provided a speaker apparatus for a thin television according to the sixth aspect of the present invention, wherein the interior of the speaker cabinet is first, second, and third. And a fourth room, and the speaker units are divided into first and second rooms.
And the opening for external sound emission is
The sound emitted to the front side of the speaker unit and the sound emitted to the rear side of the speaker unit pass through the first, second, and third rooms, respectively, and are combined in the fourth room. The sound is emitted to the outside of the cabinet through the sound emission opening.

According to a twelfth aspect of the present invention, in the speaker device for a flat-screen television according to the present invention, the third room functions as an acoustic tube, Is characterized by acting as a phase inversion type.

According to a ninth aspect of the present invention, there is provided the speaker device for a flat-screen television according to the ninth aspect, wherein the second, third, and fourth rooms have an acoustic structure. It is characterized in that a frequency having a wavelength twice as long as the length of the tube and a resonance frequency as the phase inversion type are substantially the same.

According to a tenth aspect of the present invention, there is provided a speaker apparatus for a flat-screen television according to any one of the first to ninth aspects.
The speaker unit is characterized in that a diaphragm is directly connected to a voice coil using a repulsion magnetic circuit, and is directly connected to the diaphragm.

Further, according to the present invention, there is provided a speaker device for a flat-screen television according to the present invention.
The speaker device according to any one of the above, wherein the cabinet is formed by blow molding.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the concept of a speaker device for a flat-screen television according to the present invention will be briefly described. For example,
A plasma display panel television, which is one of the panel display televisions, has a thickness of about 10 cm.
Actually, this thickness includes components such as a power supply, a tuner, and an amplifier in addition to a glass panel used for display. However, each of the above-described constituent units other than the display panel does not need to be extended over the entire surface of the panel, and can be made smaller than the panel area by a space-saving design. Therefore, it is possible to arrange a speaker cabinet in the remaining portion, and it is possible to configure a subwoofer using the volume of the speaker cabinet. However, the thickness needs to be set to about 5 cm in view of the overall thickness, and a speaker unit having a normal structure cannot be used.

Therefore, in the present invention, the diaphragm is directly attached to the voice coil by using a repulsive magnetic circuit, and the diaphragm is made of an ultra-thin loudspeaker unit having a substantially flat surface.
It becomes possible to incorporate a speaker unit having a diameter of about m, so that practically sufficient low-frequency sound reproduction can be performed in ordinary households. Furthermore, if the speaker cabinet is configured to rotate around a housing part such as a power supply, a part of the speaker cabinet can be used as an acoustic tube, and can be resonated at a wavelength four times as long as the length thereof. If the size is about the same, a reproduced sound of about 60 to 70 Hz can be obtained.

Next, an embodiment of the speaker device for a flat-screen television according to the present invention will be described with reference to the drawings. 1 to 3
FIG. 1 is a schematic view of a first embodiment of a speaker device for a flat-screen television according to the present invention. In this embodiment, a case is shown in which the apparatus is mounted on a thin television set including a plasma display panel (hereinafter, referred to as a PDP).

Reference numeral 1 denotes a speaker cabinet, which is a PDP.
The panel 2 is arranged in a katakana “b” shape along the inside of the outer periphery of the rear surface so as to go around the power supply circuit 3 arranged near the center of the rear surface of the panel 2. The speaker unit 4 is mounted on the left side when viewed from the front as shown by a dotted circle, for example, and its magnetic circuit is made thinner by using a repulsive magnetic circuit, and is built in the speaker cabinet 1. ing. Further, side speakers 5 are attached to both sides of the PDP panel 2, however, since they are not related to the present invention, a detailed description of the structure is omitted here. The speaker cabinet 1, the PDP panel 2, and the side speakers 5 are mounted on a stand S.

FIG. 2 is a diagram showing only the speaker cabinet 1 extracted from the speaker device for a flat-screen television of FIG. In this embodiment, actually, the size of the PDP panel 2 is, for example, 42 inches, and the size excluding the side speakers 5 is 1000 mm in width, 650 mm in length, and 50 mm in depth. Among them, the size of the electric circuit 3 is 650 mm in width and 350 mm in length, and the speaker cabinet 1 is arranged so as to surround the circumference.
The interior space of the square-shaped speaker cabinet 1 is composed of several room portions, and the left room portion 1L
Is 200 mm, the width of the upper room portion 1U and the width of the right room portion 1R are 150 mm, and the depth is 40 mm.

The lower room portion 1B of the speaker cabinet 1 has a width of 100 mm in the room portion 1BH corresponding to the back side of the PDP panel 2, and furthermore, the lower side of the room portion 1BH is flush with the front surface of the PDP panel 2. The room part 1BF is extended with a width of 50 mm to the point where it becomes. Therefore, the depth of the room portion 1BF includes the thickness of the PDP panel 2 of 50 mm and is 90 mm. Further, in the room portion 1BF, the port 6 is provided so as to have an opening on the same plane as the front surface of the panel.

FIG. 3 is a partially enlarged sectional view of the speaker cabinet 1. As shown in FIG. 3, the speaker unit 4 is fixed to mounting portions 16a and 17a extending from the front baffle 16 and the back baffle 17 constituting the left room portion 1L of the speaker cabinet 1, respectively. The circular diaphragm 12 is built in the portion 1L so as to be parallel to the width direction. Therefore, the left room portion 1L is partitioned into a front room portion 1La where sound 14 is emitted forward from the diaphragm 12 of the speaker unit 4 and a rear room portion 1Lb where sound 15 is emitted behind. In addition, 1 L of the left room portion of the speaker cabinet 1
Is connected to the lower room part 1B,
The rear room portion 1Lb is connected to the upper room portion 1U.

The structure of the speaker unit 4 includes a repulsion magnetic circuit 11 and a paper diaphragm 12 which is formed in a substantially planar shape and gradually becomes thinner from the center to the outer periphery. Further, the diaphragm 12 is directly adhered to the voice coil 13, and the depth required for incorporating the speaker unit 4 can be reduced to the same value as the value obtained by adding the required amplitude to the height of the voice coil 13. In principle, the thinnest configuration is possible. In the present embodiment, since the depth of the speaker cabinet 1 is 40 mm, it becomes approximately 35 mm when the thickness of the cabinet 1 is subtracted, but it is sufficiently accommodated even in consideration of the speaker amplitude. The diameter of the speaker unit 4 in this embodiment is 16 cm.

As can be seen from FIG. 3, the sound 14 emitted forward from the diaphragm 12 of the speaker unit 4 enters the lower room portion 1B from the front room portion 1La of the left room portion 1L of the cabinet 1. On the other hand, the sound 15 emitted backward from the diaphragm 12 of the speaker unit 4 enters the upper room portion 1U via the rear room portion 1Lb of the left room portion 1L of the cabinet 1. Sound 1 in upper unit 1U
5 further passes through the right room part 1R and the lower room part 1B
And is synthesized with the sound 14 emitted from the front of the diaphragm 12 near the room portion 1M. The synthesized sound is emitted to the outside from a port 6 provided in the lower room portion 1B of the cabinet 1.

As described above, the interior of the speaker cabinet 1 includes the first room (1La), the second room (1Lb),
The room is partitioned so as to form a third room (1U and 1R) and a fourth room (1B), and the sound emitted to the front side of the speaker unit 4 and the sound emitted to the rear side of the speaker unit 4 are respectively the first and second rooms. After passing through the first, second and third rooms, they are synthesized in the fourth room and released from the external sound emission opening (6) to the outside of the cabinet.

In FIG. 2, the upper room portion 1U and the right room portion 1R constituting the third room in the cabinet 1 almost function as an acoustic tube due to their size and shape, and have a length as an acoustic tube. Calculated about 140
cm, so that the lowest resonance frequency of the acoustic tube is about 60 Hz. In the cabinet 1, the secondary resonance frequency as an acoustic tube by the rear room portion 1Lb, the upper room portion 1U, and the right room portion 1R constituting the second and third rooms is about 120 Hz, and the sound phase of this frequency is And the front emission sound of the speaker 4 is in phase when synthesized, and the frequency of the phase inversion type resonance system including the lower room portion 1B and the port 6 constituting the fourth room of the cabinet 1 is also set to about 120 Hz. Therefore, the sound of the frequency can be reproduced efficiently, and the sound of the frequency of 60 to 120 Hz in total can be effectively reproduced.

[0027]

FIG. 4 is a schematic diagram of a second embodiment of the speaker device for a flat-screen television according to the present invention. In FIG.
Only the speaker cabinet 1 is shown, and the PDP panel 2 and the side speakers 5 are omitted. In FIG.
(A) is a front view, (B) is a sectional view taken along line BB, (C) is a view seen from arrow C, (D) is a view seen from arrow D, and (E) is a sectional view taken along line EE. (F) is a sectional view taken along line FF.

In this embodiment, the speaker cabinet 1
Are formed in a concave shape instead of a rectangular shape as described above. The speaker unit 4 is the same as that shown in FIG.
Are fixed to a mounting plate 18 provided between the front baffle and the back baffle, and a circular diaphragm is built in so as to be parallel to the width direction. Therefore, the left room part 1
L 'is partitioned into a front room portion 1L'a where sound is emitted forward from the speaker unit 4 and a rear room portion 1L'b where sound 15 is emitted backward. In the lower room part 1B of the speaker cabinet 1, the room part 1BH
And 1BF are divided into two by a partition plate 7. The front room portion 1L'a of the left room portion 1L is connected to the room portion 1BF, and the rear room portion 1L'b is connected to the room portion 1BH. Further, the right side room portion 1R 'connected to the room portion 1BH of the cabinet 1 is divided into two by a partition plate 8 at the center position in the width direction.

By configuring the speaker cabinet 1 in this manner, sound emitted backward from the diaphragm 12 of the speaker unit 4 is transmitted through the left room portion 1L 'and the room portion 1BH to the right room portion 1R'. The sound emitted from the diaphragm 12 of the speaker unit 4 to the front passes through the room portion 1BF of the phase inversion type and is synthesized at the opening 1M '. The synthesized sound is emitted from the port 6 to the outside.

As described above, the interior of the speaker cabinet 1 includes the first room (1L'a) and the second room (1L'a).
b) The sound is emitted to the front side of the speaker unit 4 and the sound emitted to the rear side, which is partitioned so as to constitute the third room (1BH and 1R ') and the fourth room (1BF). After passing through the first, second and third rooms, respectively, are synthesized in the fourth room and are emitted to the outside of the cabinet from the external sound emission opening (6).

As a result, it is possible to reproduce low-pitched sound based on the same principle as the configuration shown in FIGS. However, in this case, since the length of the acoustic tube and the volume of the cabinet are shorter and smaller than those described above, the reproduction band shifts to a higher one.
In practice, the length of the acoustic tube is about 120 cm, the minimum resonance frequency is about 71 Hz, and the secondary resonance frequency is 142 Hz.
On the other hand, the resonance frequency on the phase inversion side is slightly shifted at about 155 Hz, but there is almost no problem in practical use.

FIGS. 5 and 6 are schematic diagrams of a third embodiment of a speaker device for a flat-screen television according to the present invention. This embodiment shows a type in which sound is radiated directly from a speaker to the outside. The cabinet in this case is shown in FIG.
4 to 4 may be used, but here, as an example, a concave type similar to that shown in FIG. 4 is used. However, unlike the one shown in FIG. 4, the room portions 1BH and 1BF of the cabinet are not partitioned by the partition plate 7 and there is no partition plate 8 of the acoustic tube.

In the present embodiment, 3
A point-driven planar type is used. The structure of the speaker unit 21 is, as shown in FIG.
2, the plane diaphragm 23 is directly bonded to the voice coil 24. The speaker unit 21 has the bottom baffle 1
The speaker cabinet 1 is attached to an attachment portion 19a extending from the speaker cabinet 9 and is installed at the bottom of the speaker cabinet 1 so as to emit sound directly downward, so that it cannot be seen from the front. In this embodiment, the ports 25 are provided on both sides downward so as to have a phase inversion structure. If the size of the cabinet 1 at this time is set to a size according to FIG. 1, about 6 liters can be secured, which is a practically acceptable level for bass reproduction in ordinary households.

Although several embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications can be made. For example, in the embodiments of FIGS. 1 and 2, the port opening surface may be provided on the lower side without being provided on the front surface. In this case, the cabinet on the lower side may be structured so as not to go around the front surface of the PDP panel so that the cabinet is completely hidden behind the panel. In addition, as a cabinet shape, in addition to the square shape and the concave shape as described above,
Shapes such as a "day" shape or an "eye" shape can also be used. Further, by making the cabinet by blow molding, it is preferable from the viewpoint of manufacturing and reliability that it can be integrally formed without bonding the front and back surfaces unlike a cabinet in normal injection molding.

As described above, in the present invention, by effectively utilizing the back surface of the panel display television, a sufficient cabinet volume necessary for practically sufficient low-frequency sound reproduction is secured, and the diaphragm is voiced using the repulsion magnetic circuit. By using the speaker unit directly attached to the coil,
Bass reproduction becomes possible without sacrificing space saving.

[0036]

According to the present invention, even in a thin panel display television such as a PDP panel, it is possible to obtain a low sound which is practically sufficient in ordinary households, and to provide a low-cost and highly reliable subwoofer. Can be.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a speaker device for a flat-screen television according to the present invention.
1A is a front view, and FIG. 1B is a right side view.

FIGS. 2A and 2B are schematic views showing a part of the thin-panel television speaker device shown in FIG. 1, in which FIG. 2A is a front view and FIG. 2B is a cross-sectional view taken along line AA.

FIG. 3 is a partially enlarged sectional view of the speaker device for a flat-screen television of FIG. 1;

FIG. 4 shows a second example of the speaker device for a flat-screen television according to the present invention.
1A is a front view, and FIG.
-B line sectional view, (C) is a view seen from arrow C, (D) is a view seen from arrow D, (E) is a sectional view taken along line EE, (F) is F
FIG. 4 is a sectional view taken along line F.

FIG. 5 is a third view of the speaker device for a flat-screen television according to the present invention.
1A is a front view, and FIG.
-G line sectional view, (C) is a bottom view.

FIG. 6 is a view showing an H of a mounting portion of the speaker unit in FIG. 5;
FIG. 4 is an enlarged sectional view taken along line H.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Speaker cabinet 1L Left room part 1R Right room part 1U Upper room part 1B Lower room part 2 PDP panel 3 Power supply circuit 4 Speaker unit 5 Side speaker 6 port

Claims (11)

[Claims] 1. A speaker device attached to a thin panel display television, wherein a speaker cabinet is arranged along an inner periphery of a rear surface of the panel. 2. The speaker device for a flat-screen television according to claim 1, wherein the speaker cabinet is formed in a square shape along an outer periphery of a back surface of the panel. 3. The speaker device for a flat-screen television according to claim 1, wherein the speaker cabinet is formed in a concave shape along an outer periphery of a back surface of the panel. 4. The speaker device for a flat-panel television according to claim 1, wherein the speaker unit is mounted at an arbitrary position in the internal space of the speaker cabinet, and an external sound emission opening is provided at a predetermined position. Characteristic speaker device for flat-screen TV. 5. The speaker device for a flat-screen television according to claim 1, wherein a speaker unit for directly emitting sound downward is provided at the bottom of the speaker cabinet. . 6. The speaker device for a flat panel television according to claim 4, wherein the sound emitted to the front side of the speaker unit and the sound emitted to the rear side of the speaker cabinet are synthesized after passing through different routes. A speaker device for a flat-panel television, wherein the speaker device is partitioned so as to be emitted to the outside of the cabinet through an external sound emission opening. 7. The flat panel television speaker device according to claim 6, wherein the interior of the speaker cabinet is partitioned to form first, second, third, and fourth rooms, and the speaker unit is a first unit. And an external sound emission opening is provided in the fourth room, and the sound emitted to the front side and the sound emitted to the rear side of the speaker unit are respectively disposed in the first room. A speaker device for a flat-panel television, wherein the speaker device is synthesized in the fourth room after passing through the second and third rooms and is emitted to the outside of the cabinet through the external sound emission opening. 8. The speaker device for a flat-screen television according to claim 7, wherein the third room functions as an acoustic tube, and the fourth room functions as a phase inversion type. 9. The speaker device for a flat-panel television according to claim 8, wherein the second, third and fourth rooms have a frequency whose wavelength is twice the length of the acoustic tube and a phase inversion type. A speaker device for a flat-screen television, wherein the speaker devices are configured to have substantially the same resonance frequency. 10. The speaker device for a flat-panel television according to claim 1, wherein the speaker unit is of a diaphragm direct-coupled type in which a diaphragm is directly attached to a voice coil using a repulsive magnetic circuit. A speaker device for a flat-panel television. 11. The speaker device for a thin television according to claim 1, wherein the cabinet is formed by blow molding.