JP2008177861A - Speaker unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a speaker unit that can be installed even if the depth of a display device is small. <P>SOLUTION: In the speaker unit 20, each of a main speaker 21 and a sub speaker 22 has a rectangular diaphragm, and a cabinet 23 includes the main speaker 21 and the sub speaker 22 which are built in and has an opening face 27 for opening a slit-shaped sound emitting hole 24 for emitting sounds from the speakers, wherein a depth dimension L3 with respect to the opening face of the cabinet 23 is equal to or smaller than a depth dimension L1 of a thin type television 1 to be mounted, or a width dimension L4 of the opening face 27 of the cabinet 23 is equal to or smaller than a dimension obtained by eliminating the depth dimension L2 of a display 10 constituting the thin type television 1 from the depth dimension L1 of the thin type television 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a speaker device that is attached to the back or side of a flat-screen television and reproduces audio signals.

In recent years, televisions equipped with a liquid crystal display or a plasma display panel (PDP) have started to spread in place of televisions (display devices) equipped with a deep CRT display. These displays can be made thin with a small depth compared to the size of the screen.
Such TV sound is reproduced by a built-in speaker device or an external speaker device. In the case of a built-in speaker device, the built-in location is determined by the mutual positional relationship with the display. A thin display makes the TV main body thin, so that the restriction on the location of the speaker device is large, the depth is naturally small, and the vertical and horizontal dimensions cannot be determined with sufficient space due to space restrictions. In addition, at present, it is required to make the exterior dimensions (dimensions as viewed from the front) in which the display is accommodated as small as possible.
Some conventional televisions having a built-in CRT display have speaker devices arranged in the depth direction. For example, there are those shown in Patent Document 1 and Patent Document 2. The speaker device of Patent Document 1 has two built-in speakers, and one speaker is provided with a cone-shaped speaker as a front speaker, and the sound emitted therefrom is guided through a horn-shaped sound path that opens forward. The other speaker was an omnidirectional cone type speaker that opened upward as an upper speaker. Moreover, the speaker apparatus of patent document 2 was comprised by the cone-shaped speaker and the flat horn-shaped sound path on both sides of the television.

JP-A-6-284488 (paragraphs 0020 to 0025) JP-A-6-326948 (paragraphs 0010 to 0016)

  The conventional speaker device is configured as described above and has a structure in which sound is emitted from a narrow part on the front surface of the display. In order to emit sound from a narrow part, the depth direction (or vertical direction) is used. In addition, the speaker unit itself employs a cone-shaped speaker having a depth. Therefore, it is difficult to mount the conventional speaker device on a thin television display, or there is a problem that the speaker device cannot be installed when the depth of the display device is small.

  The present invention has been made to solve the above-described problems, and an object thereof is to obtain a speaker device that can be installed even when the depth of a display device is small.

  A speaker device according to the present invention includes a plurality of speakers having a rectangular diaphragm, a cabinet having a plurality of speakers and an opening surface that opens slit-like sound emission holes that radiate sound from the plurality of speakers. A display whose depth dimension with respect to the opening surface of the cabinet is equal to or smaller than the depth dimension of the display device to be mounted, or whose horizontal width dimension of the opening surface of the cabinet constitutes the display device from the depth dimension of the display device The dimension is less than the dimension excluding the depth dimension.

  According to the present invention, it is possible to obtain a speaker device that can be installed even when the depth of the display device is small.

An embodiment of the present invention will be described below.
Embodiment 1 FIG.
FIG. 1 is a perspective view of a flat-screen television according to Embodiment 1 of the present invention. The flat-screen television 1 includes a display 10 and a speaker device 20, and the speaker device 20 is perforated in the cabinet 23, a main speaker 21, a sub speaker 22, a cabinet 23 that houses the main speaker 21 and the sub speaker 22. The surface of the cabinet 23 that is configured by the sound emission holes 24 and in which the sound emission holes 24 open is referred to as an opening surface 27.
FIG. 2 is a cross-sectional view of the flat-screen television according to the first embodiment. In the speaker device 20, an amplifier 30 is connected by a connection cord 31 for driving, the depth dimension of the flat-screen television 1 is L1, and the display 10 The depth dimension is L2.
FIG. 3 is a perspective view of the speaker device according to Embodiment 1 of the present invention. The depth dimension of the cabinet 23 with respect to the opening surface 27 is L3, and the lateral width dimension of the opening surface 27 is L4.

  Here, the main speaker 21 and the sub-speaker 22 are flat speakers having a small depth, such as a full-surface driving speaker, an electrostatic speaker, a piezoelectric speaker, etc. The thickness of the main speaker 21 and the sub-speaker 22 is about 10 mm. Therefore, it is thinner than a conventional cone-shaped speaker, and the volume of the entire speaker can be reduced.

  The cabinet 23 incorporates the main speaker 21 and the sub-speaker 22, has an opening surface 27 that opens slit-like sound emission holes 24 that radiate sound of the main speaker 21 and the sub-speaker 22, and is provided on both sides of the display 10. Install. For example, as shown in FIG. 1, it can be attached to both sides of the center, and can also be attached to both the upper side and the lower side. The cabinet 23 of the first embodiment has a depth dimension L3 with respect to the opening surface 27 of the cabinet 23, which is not more than the depth dimension L1 of the flat-screen television 1 to which the cabinet 23 is mounted. The cross-sectional shape of the cabinet 23 parallel to the opening surface 27 can be any structure such as a rectangular parallelepiped, a circle, an ellipse, or a polygon. The opening surface 27 of the cabinet 23 can be attached so as to face at least one of the front surface, the side surface, and the rear surface of the thin television 1. The sound emission holes 24 are elongated slit-like holes in the cabinet 23, and sound from the main speaker 21 and the sub speaker 22 is radiated.

  As shown in FIG. 3, when the main speaker 21 is brought into close contact with the side surface 28 or the side surface 29 in the cabinet 23, the width L4 of the opening surface 27 of the cabinet 23 itself can be reduced. Even if it is mounted on the side, it is possible to suppress the width of the thin television 1 from being increased. In addition, by freely setting the aspect ratio of the main speaker 21 and the sub-speaker 22, the main speaker 21 and the sub-speaker 22 can be adjusted to the depth dimension L1 of the thin television 1 and the depth dimension L3 with respect to the opening surface 27 of the cabinet 23. Structure.

The cabinet 23 accommodates the main speaker 21 and the sub-speaker 22 and is attached to both sides of the display 10, and sound is radiated from a sound emitting hole 24 having an elongated slit shape.
The speaker device 20 composed of two speakers can control the state of sound radiated from the sound emission hole 24 by the cooperative operation of the main speaker 21 and the sub speaker 22. For example, the main speaker 21 in FIGS. 1 and 2 is mounted on the side surface of the cabinet 23, and the sub speaker 22 is mounted on the rear surface of the cabinet 23. In this configuration, the sound of the main speaker 21 close to the sound emission hole 24 is mainly emitted, but the sound of the sub-speaker 22 mounted on the rear surface propagates (from left to right in FIG. 2). The sound emitted from the sound emission hole 24 can be expanded and the radiation direction can be changed by changing the position of the sound in the propagation process (in FIG. 2, the direction of the sound is directed toward the viewer). Example). In FIG. 1 and FIG. 2, the signals given to the main speaker 21 and the sub-speaker 22 driven by the amplifier 30 are the same, and the above-mentioned effect is obtained by the sound propagation characteristics mainly due to the speaker and cabinet configuration (structure).

  On the other hand, the sound field can be controlled by electric means. Examples thereof will be described with reference to FIGS. 4, 5, and 6. 4 is a connection diagram of a processing circuit according to the first embodiment of the present invention, FIG. 5 is a connection diagram of another processing circuit according to the first embodiment of the present invention, and FIG. 6 is a first embodiment of the present invention. It is a figure which shows the phase characteristic of the processing circuit by.

In FIG. 4, the processing circuit 40 is connected to the sub-speaker 22 side of the connection cord 31. The processing circuit 40 is configured by passive elements such as a capacitor, a coil, and a resistor, so that the design is simple and inexpensive. As a function, the signal level (amplitude) changes the phase, and further, for band limitation. It can also be used as a filter.
In FIG. 5, the processing circuit 41 is also connected to the main speaker 21 side, and functions equivalent to or higher than those in FIG. 4 can be provided.
FIG. 6 is a diagram showing the phase characteristics when one capacitor, one coil, and an all-pass filter are connected to each other, and shows the characteristics when the main speaker 21 or the sub-speaker 22 is one resistor (R) ( The coil and capacitor are connected in series with the speaker). For example, the characteristic when a capacitor having a capacitance of C is connected is a curve of 42, and the phase difference when not connected is 1 / (ωCR) (radian). When the frequency changes from low to high, the phase shifts from zero to zero. In the case of a coil having an inductance L, the phase difference is −ωL / R (radian) 43, and the phase is changed from 0 to a slow phase from low to high. In the case of a capacitor and a coil, the signal level has a frequency dependency, and the low frequency level is reduced in the capacitor, and the high frequency level is reduced in the coil. Another characteristic 44 in FIG. 6 is the case of an all-pass filter, where the phase changes by ± π (radian) but the signal level does not change. As described above, the phase and level can be set in accordance with the frequency band by appropriately selecting the elements used in the processing circuit. This makes it possible to control the radiated sound.

  As described above, according to the first embodiment, the main speaker 21 and the sub speaker 22 having the rectangular diaphragm, the main speaker 21 and the sub speaker 22 are incorporated, and the sound from the main speaker 21 and the sub speaker 22 is radiated. And a cabinet 23 having an opening surface 27 that opens a slit-like sound emitting hole 24, and a depth dimension L3 with respect to the opening surface 27 of the cabinet 23 is equal to or less than a depth dimension L1 of the thin television 1 to which the thin television 1 is mounted. The speaker device 20 that can be installed in a space with a small depth can be obtained.

  Further, according to the first embodiment, at least one of the main speaker 21 and the sub-speaker 22 is connected to a processing circuit composed of passive elements, so that an element used for the processing circuit is appropriately selected. Thus, it is possible to set the phase and level in accordance with the frequency band, and thereby it is possible to control the radiated sound.

  Further, according to the first embodiment, as the main speaker 21 and the sub-speaker 22, at least one of a full-surface driving type speaker, an electrostatic type speaker, and a piezoelectric type speaker is used, so that it can be installed in a space with a small depth. There is an effect that a possible speaker device 20 can be obtained.

Embodiment 2. FIG.
FIG. 7 is a cross-sectional view of a flat-screen television according to Embodiment 2 of the present invention.
As shown in FIG. 7, the second embodiment is a speaker device 20 similar to the first embodiment, but the speaker device 20 of the first embodiment is attached so that the opening surface 27 is the front surface of the thin television 1. However, the speaker device 20 according to the second embodiment is attached so that the opening surface 27 is a side surface of the thin television 1. The opening surface 27 of the second embodiment is attached to the side surface of the thin television 1. However, since the sound emitting hole 24 is elongated in a slit shape, even a rectangular opening has a wide orientation in the slit width direction with a small size. Therefore, a sufficient volume can be obtained even in front of the flat-screen TV 1. Since the short side of the opening surface 27 of the cabinet 23 is in the same direction as the depth of the flat-screen TV 1, the cabinet 23 can be attached while being shifted inward from the side end surface of the flat-screen TV 1 and further close to the back surface of the display 10. Since it can arrange | position or closely_contact | adhere, the freedom degree of attachment of the cabinet 23 increases. Further, the width dimension L4 of the opening surface 27 of the cabinet 23 according to the second embodiment is equal to or less than the dimension obtained by removing the depth dimension L2 of the display 10 from the depth dimension L1 of the thin television 1 to which the thin television 1 is mounted.

  In the first embodiment, the sound emitting hole 24 is opened on the front surface of the thin television 1, and in the second embodiment, the sound emitting hole 24 is opened on the side surface of the thin television 1. For example, the sound emitting hole 24 of the speaker device 20 of the first embodiment is provided. The sound emitting hole 24 of the speaker device 20 can be opened on the back surface of the thin television 1 by directing the opening surface 27 toward the back surface side of the thin television 1.

  Also in the second embodiment, the configuration of the main speaker 21 and the sub speaker 22 and the processing circuit can be connected in the same manner as in the first embodiment, thereby obtaining the same sound field control effect as in the first embodiment. Can do.

  As described above, according to the first embodiment, the main speaker 21 and the sub speaker 22 having the rectangular diaphragm, the main speaker 21 and the sub speaker 22 are incorporated, and the sound from the main speaker 21 and the sub speaker 22 is radiated. And a cabinet 23 having an opening surface 27 that opens a slit-like sound emitting hole 24. A display 10 that forms a display device with a horizontal dimension L4 of the opening surface 27 of the cabinet 23 from a depth dimension L1 of the thin television 1 The speaker device 20 that can be installed in a space having a small depth can be obtained.

  Moreover, according to Embodiment 2, the dimension L1 of the depth of the thin television 1 is set by attaching the opening surface 27 of the cabinet 23 so as to face the front, side, or back of the thin television 1. Even if it is small, there is an effect that the speaker device 20 that can be installed can be obtained.

Embodiment 3 FIG.
FIG. 8 is a sectional view of a speaker device according to Embodiment 3 of the present invention.
As shown in FIG. 8, the third embodiment is a modification of the speaker device 20 of the first embodiment, and has a structure of a cabinet 23 with a reduced cross-sectional area in the vicinity of the sound emission hole 24. The cross-sectional area on the opening surface 27 side in the vertical direction is smaller than the cross-sectional area on the back surface of the cabinet 23 facing the opening surface 27. The sub-speaker 22 in FIG. 8A has a structure arranged so as to be perpendicular to the main speaker 21 as in the first embodiment, and the sub-speaker 22 in FIG. It is the structure attached to. With these structures, since the lateral width in the vicinity of the sound emission hole 24 is small, the lateral width of the flat-screen television 1 can be reduced when the speaker device 20 is attached.

  As described above, according to the third embodiment, the sectional area of the opening surface 27 side in the depth direction and the vertical direction of the cabinet 23 is larger than the sectional area of the rear surface of the cabinet 23 facing the opening surface 27. By reducing the width, the width in the vicinity of the sound emission hole 24 is small, so that when the speaker device 20 is attached, the speaker device 20 that can be installed in a space with a small depth can be obtained, and the flat-screen television 1 can be obtained. There is an effect that the lateral width of can be reduced.

Embodiment 4 FIG.
FIG. 9 is a cross-sectional view of a speaker device according to Embodiment 4 of the present invention.
As shown in FIG. 9, in the fourth embodiment, the cabinet 23 has a plurality of vacancies having sound emission holes, and the main speaker 21 and the sub-speaker 22 are housed in separate vacancies. , The sound is emitted from the sound emission hole 25. Since the independent sound emitting holes 24 and 25 are adjacently opened, the radiated sound can be controlled more reliably. If the sound emitting holes 24 and 25 are slits, the lateral width will not increase even if two are opened.

  As described above, according to the fourth embodiment, the main speaker 21 and the sub-speaker 22 are housed in a vacant room having individual sound emitting holes in the cabinet 23, and the independent sound emitting holes 24 and 25 are provided. By opening adjacently, it is possible to obtain the speaker device 20 that can be installed even in a space with a small depth, and it is possible to more reliably perform radiation sound control.

Embodiment 5. FIG.
FIG. 10 is a cross-sectional view of a speaker device according to Embodiment 5 of the present invention, and FIG. 11 is a cross-sectional view of another speaker device according to Embodiment 5 of the present invention.
In the speaker device 20 shown in FIGS. 10 and 11, the main speaker 21 and the sub speaker 22 are arranged at, for example, a right angle so as to be in contact with one side. In FIG. 10, the sound of the main speaker 21 and the sub-speaker 22 is radiated from one sound emitting hole 24, and is radiated from the two sound emitting holes 24 and 25 in FIG. In FIG. 11, the main speaker 21 and the sub-speaker 22 also serve as a partition inside the cabinet 23, and sound is emitted from the sound emission holes using the front radiated sound or the back radiated sound of the sub-speaker 22. FIG. 11 (A) uses both the front and back sounds of the sub-speaker 22. Of course, a configuration using only one sound is also possible. In that case, the sound on the sound emission hole 25 side may be used. FIG. 11 (B) is a modification of FIG. 11 (A), and in particular, a structure that leads to the sound emission hole 25 side by the sound path 26 is formed.

  As described above, according to the fifth embodiment, the structure in which the main speaker 21 and the sub-speaker 22 are in contact with each other makes it possible to obtain the speaker device 20 that can be installed in a space with a small depth. Play.

  The speaker device 20 according to Embodiment 1-5 uses sound radiated mainly from the front of the main speaker 21 and the sub-speaker 22 housed in the cabinet 22 except for the speaker device 20 of FIG. 11 of Embodiment 5. However, for the sound radiated from the back surface of the main speaker 21 or the sub-speaker 22, a small volume sealed vacant space is formed on the back surface of the main speaker 21 or the sub-speaker 22 so that the sound is not radiated from the back surface. Alternatively, the sound that reaches the outside of the thin television 1 or the sound emission hole 24 may be reduced by using a cabinet structure that does not affect the sound that exits from the sound emission hole 23 even if radiated.

  In addition, although two embodiments of the speakers to be used have been described, sound emission can be controlled more easily as the number of speakers increases, and various configurations and structures can be realized.

1 is a perspective view of a thin television according to Embodiment 1 of the present invention. 1 is a cross-sectional view of a flat-screen television according to Embodiment 1 of the present invention. 1 is a perspective view of a speaker device according to Embodiment 1 of the present invention. It is a connection diagram of the processing circuit by Embodiment 1 of this invention. It is a connection diagram of another processing circuit according to the first embodiment of the present invention. It is a figure which shows the phase characteristic of the processing circuit by Embodiment 1 of this invention. It is sectional drawing of the thin-screen television by Embodiment 2 of this invention. It is sectional drawing of the speaker apparatus by Embodiment 3 of this invention. It is sectional drawing of the speaker apparatus by Embodiment 4 of this invention. It is sectional drawing of the speaker apparatus by Embodiment 5 of this invention. It is sectional drawing of another speaker apparatus by Embodiment 5 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Flat-screen television, 10 display, 20 speaker apparatus, 21 main speaker, 22 subspeaker, 23 cabinet, 24,25 sound emission hole, 26 sound path, 27 opening surface, 28,29 side surface, 30 amplifier, 31 connection cord, 40 , 41 processing circuit, L1 depth dimension of flat-screen television, L2 display depth dimension, L3 depth dimension with respect to cabinet opening face, L4 width dimension of opening face.

Claims (8)

A plurality of speakers having rectangular diaphragms;
A cabinet including the plurality of speakers, and having an opening surface that opens a slit-like sound emitting hole that radiates sound from the plurality of speakers.
A display in which the depth dimension with respect to the opening surface of the cabinet is equal to or less than the depth dimension of the display device to be mounted, or the horizontal width dimension of the opening surface of the cabinet is configured from the depth dimension of the display device. The speaker device is characterized by having a dimension equal to or less than the dimension excluding the dimension of the depth.   2. The speaker device according to claim 1, wherein at least one speaker among the plurality of speakers is connected to a processing circuit composed of passive elements.   The speaker device according to claim 1, wherein a cross-sectional area on the opening surface side in a direction perpendicular to the depth direction of the cabinet is smaller than a cross-sectional area on the rear surface of the cabinet facing the opening surface.   The speaker device according to claim 1, wherein the cabinet has a plurality of vacant chambers having sound emitting holes, and each speaker is individually accommodated in each of the vacant chambers.   The speaker device according to claim 1, wherein at least two of the plurality of speakers are in contact with each other.   6. The speaker device according to claim 5, wherein the cabinet has a sound emitting hole on the back side of at least one speaker in contact therewith.   2. The speaker device according to claim 1, wherein the opening surface of the cabinet is attached so as to be directed to any one of a front surface, a side surface, and a rear surface of the display device.   2. The speaker device according to claim 1, wherein at least one of a full-drive speaker, an electrostatic speaker, and a piezoelectric speaker is used as the speaker.

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