JP2018082502A - Speaker box and television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker box and a television receiver that can suppress occurrence of standing waves caused by acoustic waves radiated from a speaker unit and secure sound pressure performance, thereby obtaining high quality sound.SOLUTION: A part of inner wall surfaces of a pair of wall portions (11 and 12) confronting each other through a speaker axis of a speaker unit (20) out of the inner wall surfaces of a speaker box (10) is configured to be shaped along the outer periphery of the speaker unit (20) at an end portion of a front surface side of the wall portions. That shape of each inner wall surface forms a curved surface. The pair of confronting wall portions (11 and 12) is connected to the curve formed in an asymmetric shape for each other and has inner wall surfaces which extend in a direction separating from the speaker unit (20), and an internal space which expands to the outside of a diaphragm of the speaker unit (20) in a direction perpendicular to the speaker axis is formed between the inner wall surfaces of the pair of confronting wall portions (11 and 12).SELECTED DRAWING: Figure 3

Description

  The present invention relates to a speaker box and a television receiver, and more specifically, a speaker box having a configuration for outputting sound emitted from a speaker unit with high quality, and a television receiver including the speaker box, About.

  When sound is reproduced by the speaker unit, sound waves of opposite phases are emitted at the same frequency on the front and rear surfaces. Therefore, the front and back sound waves interfere with each other and cancel each other. This effect is particularly remarkable in a sound wave having a low frequency, that is, a bass. High-frequency sound waves have strong directivity, and sound waves emitted to the front and rear surfaces do not interfere with the front and back, but low-frequency sound waves have low directivity and can be easily reversed in the direction of travel. Diffracts and interferes. For this reason, it is difficult to reproduce a decent sound only by sounding the speaker unit alone, and it is necessary to confine sound waves radiated from the back surface of the speaker unit in a speaker box (also referred to as an enclosure).

  Regarding the technology for improving the acoustic characteristics of the speaker box, for example, Patent Document 1 discloses that the acoustic characteristics are not deteriorated due to the diffracted sound from the speaker unit, and the acoustic characteristics are not deteriorated due to the influence of standing waves in the speaker cabinet. The speaker is disclosed. This speaker cabinet is provided with a substantially egg-shaped cavity communicating with the speaker unit mounting hole inside the outer shell wall. On the other hand, the front region in the vicinity of the speaker unit mounting hole on the outer surface of the outer shell wall is a curved portion that moves backward as the distance from the speaker unit mounting hole increases. In addition, the rear region farther from the speaker unit mounting hole than the curved portion on the outer surface of the outer shell wall has a rectangular tube shape surrounded by four flat portions.

JP 2008-177877 A

  As described above, it is generally necessary to surround the speaker unit with a speaker box. However, inside the speaker box, sound waves radiated from the back surface of the speaker unit are reflected back and forth between the parallel facing inner walls of the speaker box. , Standing waves will be generated. For example, as shown in the example of FIG. 8, if a speaker box 100 including the speaker unit 101 has parallel facing internal walls (indicated by arrows w1 and w2), the sound waves reflected back and forth between the parallel facing internal walls. Causes a standing wave. As a result, the vibration of the speaker box 100 increases, so that a so-called “box sound” is generated as a natural resonance sound of the speaker box, which is one of the factors that deteriorate the sound quality of the speaker box 100.

  In particular, standing waves are more likely to occur and the countermeasures become more difficult as the number of parallel surfaces inside the speaker box increases. As countermeasures against resonance sound caused by such standing waves, the resonance degree is reduced by increasing the strength of the material of the speaker box, or a sound absorbing material is added inside the speaker box to reduce the resonance. However, even if these measures are taken, the standing wave itself cannot be reduced.

  In addition, thin speakers used in television receivers, etc., are mainly made of resin as the speaker box material. In this case, it is difficult to adopt a high-strength material, or the thickness of the speaker is increased in design. Are often difficult.

Even if the wall surface of the speaker box is designed to be as parallel as possible so that standing waves do not occur, if the acoustic characteristics of the speaker unit itself deteriorate or cannot be maintained, the speaker box It cannot be said that the characteristics are sufficient.
For example, in the speaker described in Patent Document 1, since a speaker box is formed by a substantially egg-shaped cavity, it is considered that a certain effect can be obtained against standing waves. As the space moves backward, the space becomes narrower in a cone shape, so that the capacity of the space behind the speaker unit cannot be sufficiently secured, and the sound pressure performance of the speaker unit cannot be ensured.

  The present invention has been made in view of the above circumstances, and obtains high-quality viewing sound by suppressing the generation of standing waves due to sound waves radiated from the speaker unit and ensuring sound pressure performance. It is an object of the present invention to provide a speaker box that can be used and a television receiver including the speaker box.

  In order to solve the above problems, the first technical means of the present invention is a speaker box to which a speaker unit is attached, and when the front side of the speaker unit attached to the speaker box is the front side of the speaker box, Of the inner wall surface of the speaker box, a part of the inner wall surface of the pair of wall portions facing each other across the speaker axis of the speaker unit has a shape along the outer periphery of the speaker unit at the end portion on the front surface side. The formed shape along the outer periphery forms a curved surface, and the pair of opposing wall portions are connected to the curved surface formed in an asymmetric shape and extend in a direction away from the speaker unit. Between the inner wall surfaces of the pair of opposing wall portions, and extending outside the diaphragm of the speaker unit in a direction perpendicular to the speaker axis. The interior space is formed, that is obtained by it said.

  According to a second technical means, in the first technical means, a plurality of protrusions supported by a wall portion of the speaker box are provided in an internal space that extends outward from the diaphragm. It is.

  The third technical means is characterized in that, in the first or second technical means, a rib protrudes from the inner wall surface of the speaker box.

  According to a fourth technical means, in the third technical means, a plurality of the speaker units are attached, and the inner wall surface on which the rib projects is provided between the one speaker unit and the other speaker unit. Including the inner wall surface of the speaker box.

  The fifth technical means is a television receiver provided with the speaker box of any one of the first to fourth technical means.

  According to the present invention, a speaker box that suppresses generation of a standing wave due to sound waves radiated from a speaker unit and obtains high-quality viewing sound by ensuring sound pressure performance, and the speaker. And a television receiver provided with a box.

It is a figure which shows the external appearance of a television receiver as an example of the apparatus provided with the speaker box by this invention. It is a figure which shows the example of an external appearance structure of the speaker part of FIG. It is a figure explaining the decomposition | disassembly structure of a speaker part. It is a figure which shows the longitudinal cross-sectional structure which looked at the speaker box equipped with the speaker unit from the side. It is the figure which looked at the speaker box from the upper surface. It is a figure which shows the horizontal cross-section structure of the speaker box which attached the speaker unit and the front panel. It is the figure which looked at the speaker box from the front. It is a figure explaining an example of the conventional speaker box which a standing wave generate | occur | produces.

  FIG. 1 is a diagram illustrating an appearance of a television receiver as an example of a device including a speaker box according to the present invention. The television receiver 1 includes a display 2 such as a liquid crystal panel that outputs video based on a received broadcast signal or external input signal, and a speaker unit 3 that outputs audio. The main body of the television receiver can be made independent by the stand 4.

  FIG. 2 is a diagram illustrating an external configuration example of the speaker unit 3. In this example, the speaker unit 3 has a configuration in which two speaker boxes 10 are connected. Each speaker box 10 includes a speaker unit (not shown), and the speaker boxes 10 are connected side by side to form an integrated speaker unit 3. A metal punching net is attached to the front surface (arrow F) side of the speaker box 10 for the purpose of design and the purpose of protecting the speaker unit. The speaker unit 3 can be attached to and supported by the stand 4.

FIG. 3 is a diagram illustrating an exploded configuration of the speaker unit. The speaker box 10 represents one speaker box constituting the speaker unit 3 and corresponds to an embodiment of the speaker box according to the present invention.
The speaker box 10 has a box shape with an opening on the front side, and includes a speaker unit mounting portion 21 for mounting two speaker units 20. The speaker unit 20 is mounted on each of the speaker unit mounting portions 21, and the front panel 30 is mounted on the front surface thereof. The speaker box 10 is provided therein with a plurality of bosses 13 protruding from the rear wall of the speaker box 10, and the front panel 30 is screwed to the tip of the boss 13, so that the speaker box 10 Mounted on the front.

  The front panel 30 is provided with an opening 31, and the front surface of the speaker unit 20 is opened to the outside in a state where the front panel 30 is attached to the speaker box 10. Here, at least the center cap portion of the speaker unit is not hidden by the front panel 30. Thereby, the sound wave from the speaker unit 20 is emitted toward the front surface. A punching net (not shown) can be further attached to the front surface of the front panel 30.

The speaker box 10 has a pair of wall portions 11 and 12 that face each other across the speaker axis of the speaker unit 20 to be attached. In this example, a pair of opposing wall portions 11 and 12 are provided above and below the speaker unit 20. The pair of wall portions 11 and 12 are provided with a curved portion 110 at a portion where the speaker unit 20 is attached.
The wall portions 11 and 12 include a wall portion 111 that is connected to the inner wall surface of the bending portion 110 and has an inner wall surface that extends in a direction away from the speaker unit 20. An internal space that extends outward from the diaphragm of the speaker unit 20 is formed between the pair of opposing wall portions 11 and 12 in a direction orthogonal to the speaker axis (in this example, the left-right direction). The internal space extends to both left and right ends of the speaker box 10 on both sides of the speaker unit 20. Such a large internal space improves the sound pressure performance of the sound wave emitted from the speaker unit 20.

  FIG. 4 is a diagram showing a vertical cross-sectional configuration of the speaker box with the speaker unit 20 mounted as viewed from the side. As shown in FIG. 4, the speaker unit mounting portion 21 of the speaker box 10 is provided with a curved portion 110 at a part of a pair of wall portions 11 and 12 facing each other across the speaker axis x of the speaker unit 20. Yes. The bending portions 110 are respectively provided above and below the speaker unit 20.

Here, when the front side (arrow F side) of the speaker unit 20 attached to the speaker box 10 is the front side of the speaker box 10, the inner wall surfaces of the speaker box 10 face each other across the speaker axis x of the speaker unit. A curved portion 110 is formed on a part of the inner wall surface of the pair of wall portions 11 and 12. The curved portion 110 is formed in a shape along the outer periphery of the speaker unit 20 at an end portion on the front surface side, and the shape along the outer periphery extends rearward from the end portion on the front surface side, and the inner wall surface and the speaker axis x. A curved surface is formed in which the distance of is gradually shortened. That is, the inner wall surface of the curved portion 110 has a bullet-shaped shape that is narrowed toward the rear.
Thus, in the vicinity of the speaker unit 20, it is possible to effectively suppress the occurrence of standing waves in this region by adopting a configuration in which curved surfaces are opposed to each other instead of a parallel wall configuration.
Here, the inner wall surface of the upper curved portion 110 and the inner wall surface of the lower curved portion 110 have an asymmetric shape with respect to a horizontal plane passing through the speaker axis. That is, in the speaker box 10, the curved surfaces respectively formed on the pair of opposing wall portions 11 and 12 are asymmetric to each other. As a result, the acoustic energy is dispersed to effectively suppress the occurrence of standing waves.

  FIG. 5 is a view of the speaker box 10 as viewed from above. A curved portion 110 is provided in a part of a pair of upper and lower wall portions 11 and 12 facing the speaker box 10. Although the upper surface of the upper wall portion 11 is illustrated, a similar curved portion 110 is provided on the lower wall portion 12. The speaker unit is disposed in a space surrounded by the upper and lower curved portions 110. A wall portion 111 is connected to the bending portion 110. The wall portion 111 extends in a direction away from the speaker unit 20 with respect to the bending portion 110. Since the inner wall surfaces of the upper and lower curved portions 110 are curved around the loudspeaker unit 20 with large acoustic energy, the generation of standing waves is effectively suppressed.

  FIG. 6 is a diagram showing a horizontal cross-sectional configuration of a speaker box to which a speaker unit and a front panel are attached, and shows a horizontal cross-section at a position passing through the center of the speaker unit. The speaker units 20 are attached to the two speaker unit attachment portions 21 of the speaker box 10 respectively. And the front panel 30 is attached to the front side (arrow F side). The speaker box 10 includes a plurality of bosses 13 protruding from the rear wall 14. The front panel 30 is screwed to the tip of the boss 13 and fixed. The boss 13 corresponds to a protrusion of the present invention.

The internal space of the speaker box 10 is a wide space communicating from T1 to T2 in the left-right direction. Due to this wide space, good sound pressure performance of the sound wave emitted from the speaker unit 20 can be obtained.
The speaker box 10 has a configuration in which a plurality of bosses 13 project from the internal space. A plurality of the bosses 13 are provided intermittently in the internal space of the speaker box 10, and the sound waves emitted from the speaker unit 20 into the internal space are diffused and scattered to suppress the occurrence of standing waves between the wall surfaces.

  Further, since the boss 13 has a shape obtained by cutting the tip of the cone, an effect of scattering and scattering the sound wave by the shape of the peripheral surface can be obtained. In addition, the plurality of bosses 13 are arranged in parallel so that the center positions thereof are aligned on a straight line. You may make it raise the effect to scatter.

FIG. 7 is a front view of the speaker box. As shown in the front view of FIG. 7 and the perspective view of FIG. 3 described above, a plurality of convex ribs 15 are provided in parallel on the inner surface side of the wall portion of the speaker box 10. The ribs 15 are provided on the inner wall surfaces of the upper and lower wall portions 11 and 12 of the speaker box 10 and the inner wall surface of the rear wall 14.
Here, in a configuration in which a plurality of speaker units 20 are mounted, the inner wall surface of the speaker box 10 on which the ribs 15 are projected includes an inner wall surface between one speaker unit 20 and another speaker unit 20. That is, as shown in FIG. 7, the rib 15 is also provided on the inner wall surface 16 between the two speaker boxes. Similarly, ribs 15 are also provided between the two speaker units 20 on the inner wall surfaces of the wall portions 11 and 12 that are vertically opposed to each other.

  By providing the plurality of ribs 15 having a ridge shape, irregular reflection can be caused on the inner wall surface, and the occurrence of standing waves can be suppressed. The shape of the rib 15 may be a ridge shape having a rectangular cross section, but for example, the reflected sound may be scattered as a ridge shape having a semicircular cross section. In addition to the ribs 15, the inner wall surface of the speaker box 10 may be provided with irregularities or curved shapes, or a shape such as a rough surface.

  In the above embodiment, the speaker box 10 is configured so that two speaker units 20 can be mounted, but three or more speaker units may be mounted. The two speaker units may be the same type of speaker units or different types having different frequencies. When two speaker units of the same type are used, the rated input can be doubled and the sound pressure characteristics can be improved by connecting in parallel to one amplifier. Moreover, in the speaker box 10, the speaker unit 20 is arrange | positioned adjacently. Also in this case, since the curved portion 110 is formed on the opposing wall portion of each speaker unit mounting portion 21 and the speaker unit is mounted inside the curved shape, the sound waves radiated from one speaker unit 20 are both sides. In comparison with the configuration in which the speaker units are arranged adjacent to each other on the parallel facing surface, the two speaker units 20 are less likely to cause interference.

  In the embodiment of the speaker box according to the present invention, the number of speaker units 20 is not limited to the above example, and one or more speaker units 20 can be mounted. In this case, in the speaker unit mounting portion on which one speaker unit 20 is mounted, the inner wall surface of the opposing wall portion has a curved shape as shown by the bending portion 110. The opposing wall portion is connected to the curved portion 110 and has an inner wall surface extending in a direction away from the speaker unit 20, thereby forming an internal space that extends outward from the diaphragm of the speaker unit 20. To do.

  With the configuration of each of the embodiments described above, a speaker box is obtained in which generation of standing waves due to sound waves emitted from the speaker unit is suppressed and high-quality viewing sound can be obtained by ensuring sound pressure performance. It is done.

The television receiver according to the present invention is a television receiver provided with the speaker box described in the above embodiment. The television receiver selects a broadcast signal received by an antenna, demodulates and decodes it, and appropriately performs image processing and audio signal processing to generate a reproduction video signal and a reproduction audio signal. The reproduction video signal is displayed on a display unit such as a liquid crystal display. The audio signal for reproduction is output as audio from a speaker unit attached to the speaker box. The speaker box can be designed as appropriate, such as being installed vertically on the side of the display in addition to the horizontally long configuration as shown in FIG.
The present invention can be configured as a speaker box and a television receiver including the speaker box.

  The technical features (components) described in the above embodiments can be combined with each other, and new technical features can be formed by combining them.

DESCRIPTION OF SYMBOLS 1 ... Television receiver, 2 ... Display, 3 ... Speaker part, 4 ... Stand, 10 ... Speaker box, 11, 12 ... Wall part, 13 ... Boss, 14 ... Rear wall, 15 ... Rib, 16 ... Inner wall surface, 20 DESCRIPTION OF SYMBOLS ... Speaker unit, 21 ... Speaker unit mounting part, 30 ... Front panel, 31 ... Opening, 100 ... Speaker box, 101 ... Speaker unit, 110 ... Curved part, 111 ... Wall part.

Claims (5)

A speaker box to which a speaker unit is attached,
When the front side of the speaker unit attached to the speaker box is the front side of the speaker box, of the inner wall surfaces of the speaker box, the inner wall surfaces of a pair of wall portions facing each other across the speaker axis of the speaker unit Is formed in a shape along the outer periphery of the speaker unit at an end on the front side, and the shape along the outer periphery forms a curved surface,
The pair of facing wall portions are connected to the curved surfaces formed in an asymmetric shape with each other, have inner wall surfaces extending in a direction away from the speaker unit, and the inner wall surfaces of the facing pair of wall portions. A speaker box, characterized in that an internal space extending outward from the diaphragm of the speaker unit is formed in a direction perpendicular to the speaker axis. The speaker box according to claim 1,
A speaker box having a plurality of protrusions supported by a wall portion of the speaker box in an internal space extending outward from the diaphragm. The speaker box according to claim 1 or 2,
A speaker box, wherein a rib protrudes from an inner wall surface of the speaker box. The speaker box according to claim 3,
The speaker is characterized in that a plurality of the speaker units are attached and the inner wall surface on which the rib protrudes includes an inner wall surface of the speaker box between one speaker unit and another speaker unit. box. The television receiver provided with the speaker box of any one of Claims 1-4.

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