JP2011091491A - Speaker device and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker device with improved positioning performance and assembling workability of a structure wherein yoke parts of two speakers are brought into contact with each other back to back, and a display device. <P>SOLUTION: Speaker units 41 and 42 are provided with a slide part 413, a rail part 424, a slide part 423, and a rail part 413 which, due to contact surfaces 411a and 421a facing and engaged with each other of yoke parts 411 and 421, inhibit the speaker units 41 and 42 from moving in a direction parallel with the contact surfaces 411a and 421a and allow the speaker units 41 and 42 to be moved in a direction perpendicular to the contact surfaces 411a and 421a. After respective contact surfaces 411a and 421a of yoke parts 411 and 421 are brought into contact with each other, this contact state is held by engagement of screws 413c and 423c with screw holes formed by the slide part 413, the rail part 424, the slide part 423, and the rail part 413. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a speaker device that outputs sound by vibrating a diaphragm and a display device such as a liquid crystal television receiver including the speaker device, and in particular, a technique for suppressing vibration during sound output of the speaker device. It is about.

In general, a display device such as a liquid crystal television receiver or a display is equipped with a speaker device that outputs sound by vibrating a diaphragm (cone paper). In this speaker device, vibration is generated due to the reaction of the piston movement of the diaphragm during sound output. For this reason, the vibration of the speaker device is transmitted to the main body cabinet of the display device, which causes the generation of unnecessary sounds (chattering noise) and the shaking of the display screen. In particular, in TV commercialization in recent years, screens are apt to become a problem due to vibrations due to further progress in size and thickness.
For this reason, for example, a method of absorbing vibration transmitted from the speaker device to the display device by fixing the speaker device to the display device via a viscoelastic material such as a thermoplastic elastomer may be employed. However, in order to enhance the vibration absorption effect of the viscoelastic substance, it is necessary to make the viscoelastic substance as soft as possible, and the material selection and formability are limited, resulting in poor workability and high cost. It was. In this case, since the speaker device has a structure that is floated by a viscoelastic material, the speaker device vibrates without any limitation. However, the vibration is caused by the reaction of the piston movement of the diaphragm. As a result, it becomes an obstructive factor for the piston movement of the diaphragm at the time of sound output, leading to deterioration of sound quality and responsiveness. In particular, since the amplitude of the diaphragm increases as the output sound becomes lower (low frequency), such a problem becomes conspicuous in the speaker device for low sound.
On the other hand, for example, in the invention according to Patent Document 1, there is provided a speaker device configured to cancel vibrations of the speakers by arranging the yoke portions (magnetic circuits) of the two speakers in contact with each other back to back. It is disclosed.

JP 2008-187598 A

However, when the yoke portions of the two speakers are brought into contact with each other as in the invention according to Patent Document 1, a repulsive force due to magnetic force acts between the yoke portions, so that the center of each yoke portion is It is difficult to fix the positions together, and there is a problem that the assembling workability of the speaker device and the display device is lowered. In particular, a strong repulsive force that cannot be fully controlled by the operator acts immediately before the yoke portion comes into contact. On the other hand, when the center positions of the yoke portions are fixed in a state of being deviated from a predetermined position, the effect of canceling vibrations with each other is reduced.
Accordingly, the present invention has been made in view of the above circumstances, and its object is to improve the positioning performance of the structure in which the yoke portions of the two speakers are in contact with each other and to improve the assembly workability of the structure. An object is to provide an improved speaker device and display device.

In order to achieve the above object, the present invention is directed to the magnetic circuit unit in which two speakers having a diaphragm and a magnetic circuit unit coupled to the diaphragm cancel each other out of the reaction force of the vibration of the diaphragm. Two speaker units for supporting the two speakers individually with the contact surface of the magnetic circuit part exposed, Provided in the two speaker units and engaged with each other with the contact surfaces of the magnetic circuit portions of the speaker units facing each other, thereby prohibiting movement in a direction parallel to the contact surfaces of the speaker units. However, movement restricting means that allows movement of each speaker unit in a direction perpendicular to the contact surface, and each speaker unit is moved forward by the movement restricting means. And a unit fixing means for holding the contact state after the contact surfaces of each of the magnetic circuit portions are brought into contact with each other by being moved closer in a restricted state in a direction parallel to the contact surface. Configured as a speaker device.
According to the present invention, when the speaker units are brought close to each other with the contact surfaces of the magnetic circuit portions facing each other and brought into contact with each other, a repulsive force acts between the magnetic circuit portions. However, since the movement of each of the speaker units in the direction parallel to the contact surface is prohibited and only the movement in the direction perpendicular to the contact surface is allowed, the operator can contact the magnetic circuit unit. Each of the speaker units can be fixed by easily contacting the surfaces. In addition, since movement in a direction parallel to the contact surface of each of the speaker units is prohibited, the contact surface of the magnetic circuit unit of each of the speaker units can be brought into contact at a predetermined position, and the center alignment is performed. Etc. can be performed easily and with high accuracy.

For example, the unit fixing means is restricted in movement by the movement restricting means and forms a screw hole in a direction parallel to the contact surface by overlapping each other with the contact surfaces in contact with each other. A screw hole forming portion provided in each of the speaker units, and a screwing member for fixing the two speaker units by being screwed into the screw holes formed by the screw hole forming portion. It is possible to become. Thus, the assembly operator can easily fix each of the speaker units so that the contact state in which the contact surfaces of the magnetic circuit units are in contact with each other is maintained.
Here, it is conceivable that the movement restricting means provided in one of the speaker units includes a rail portion formed along a direction perpendicular to the contact surface of the magnetic circuit portion. At this time, it is conceivable that the movement restricting means provided in the other speaker unit includes a sliding portion that slides along the rail portion. Accordingly, it is possible to allow movement of each speaker unit in a direction perpendicular to the contact surface while prohibiting movement of the speaker unit in a direction parallel to the contact surface. Of course, it is also conceivable that each of the rail part and the sliding part correspond to each other.
Further, it is desirable that the contact surfaces of the magnetic circuit portions of the two speaker units are bonded with an adhesive applied to one or both of the contact surfaces. Thereby, workability at the time of fixing by the unit fixing means is improved.

By the way, the present invention may be regarded as an invention of a display device including the speaker device.
In particular, if the speaker device is arranged such that the direction in which the contact surfaces face each other is parallel to the display surface of the video display unit for displaying an image, even if vibration is generated by the speaker device, The influence of vibration on the shaking of the video display unit can be suppressed.
The speaker device is not limited to being provided in the main body housing of the display device together with a video display unit for displaying video, but may be fixed to a stand member that supports the video display unit, for example. In this case, the influence of the vibration of the speaker device on the video display unit can be further reduced.

  According to the present invention, when the speaker units are brought close to each other with the contact surfaces of the magnetic circuit portions facing each other and brought into contact with each other, a repulsive force acts between the magnetic circuit portions. However, since the movement of each of the speaker units in the direction parallel to the contact surface is prohibited and only the movement in the direction perpendicular to the contact surface is allowed, the operator can contact the magnetic circuit unit. Each of the speaker units can be fixed by easily bringing the surfaces into contact with each other. In addition, since movement in a direction parallel to the contact surface of each of the speaker units is prohibited, the contact surface of the magnetic circuit unit of each of the speaker units can be brought into contact at a predetermined position, and the center alignment is performed. Etc. can be performed easily and with high accuracy.

1 is a schematic configuration diagram of a liquid crystal television X according to an embodiment of the present invention. The schematic block diagram of the speaker apparatus 40 which concerns on embodiment of this invention. The exploded view of the speaker apparatus 40 which concerns on embodiment of this invention. The figure for demonstrating the assembly operation | work of the speaker apparatus 40 which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that the present invention can be understood. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.
First, a schematic structure of the liquid crystal television X (an example of a display device) and the speaker device 40 according to the embodiment of the present invention will be described with reference to FIGS. 1 is a schematic configuration diagram of the state in which the rear cabinet of the liquid crystal television X is removed as viewed from the rear, FIG. 2A is a perspective view of the speaker device 40, and FIG. 2B is the speaker device 40. FIG.
As shown in FIG. 1, the liquid crystal television X includes a video display unit 10 having a liquid crystal panel for displaying a video such as a television broadcast, a main body chassis 11 that supports the video display unit 10, and the main body chassis 11. And a stand member 13 that supports the video display unit 10, speaker devices 20, 30, and 40 that output sound, and a fixing plate 12 that fixes the speaker device 40 to the main body chassis 11. It is configured. The liquid crystal television X has the same components as those of a conventional general liquid crystal television in addition to the components described here. The liquid crystal television X is merely an example of a display device according to the present invention, and the present invention can be applied to other display devices such as a display device in the same manner.
The speaker device 20 is a main speaker that outputs sound in the whole sound range, the speaker device 30 is a high sound speaker (tweeter) that outputs sound in the high sound region, and the speaker device 40 is a low sound speaker (woofer) that outputs sound in the low sound region. It is.

As shown in FIGS. 1 and 2, the speaker device 40 is configured by connecting independent speaker units 41 and 42. The speaker units 41 and 42 include bobbins (not shown), magnets (permanent magnets, etc.), voice coils, diaphragms (cone papers, etc.), and yoke parts 411, 421 (corresponding to magnetic circuit parts) connected to the diaphragms. ) And speaker housings 61 and 62 that support the speakers 51 and 52.
The speakers 51 and 52 vibrate a diaphragm via a bobbin based on an electric signal input to the voice coil, and output sound by vibrating air. Thereafter, the sound output from the speakers 51 and 52 is output from bass reflex ports 51a and 52a provided on the rear surfaces of the speaker units 41 and 42.
In general, the vibration of the diaphragm in the speakers 51 and 52 used for sound output in a low frequency band has a low frequency and a large amplitude. Therefore, the liquid crystal television is caused by vibrations generated in the speaker units 41 and 42 as reaction of the vibration. There is a risk that the X video display unit 10 will shake or generate unwanted sounds (billing noise).

Therefore, in the speaker device 40 of the liquid crystal television X, as shown in FIGS. 1 and 2, the speakers 51 and 52 of the speaker units 41 and 42 cancel each other out of the reaction force of the vibration of the diaphragm. As described above, the yoke portions 411 and 421 are fixed in a state where they are in contact with each other back to back. As a result, vibrations generated in the speaker units 41 and 42 cancel each other, so that the liquid crystal television X can be prevented from shaking and unwanted sound (chattering noise). In particular, a repulsive force is generated between the yoke portions 411 and 421, and stress is always applied between the speaker units 41 and 42 by the repulsive force, so that an effect of further reducing unnecessary sounds can be obtained.
The speaker device 40 according to the embodiment of the present invention improves the positioning performance of the structure in which the yoke portions 411 and 421 of the speakers provided in the two speaker units 41 and 42 are in contact with each other, The structure is characterized in that the assembly workability of the structure can be improved.

Hereinafter, the detailed configuration and assembly structure of the speaker device 40 will be described in detail with reference to FIGS.
As shown in FIG. 3, in the speaker device 40, the speaker units 41 and 42 individually support the speakers 51 and 52, respectively, with the contact surfaces 411a and 421a of the yoke portions 411 and 421 exposed. ing.
The two speaker units 41, 42 include two sets of sliding portions 413, rails that engage with each other with the contact surfaces 411 a, 421 a of the yoke portions 411, 421 of the speaker units 41, 42 facing each other. A portion 424, a rail portion 414, and a sliding portion 423 are provided. The rail portions 414 and 424 are formed along a direction perpendicular to the contact surfaces 411a and 421a of the yoke portions 411 and 421 (a direction in which the contact surfaces 411a and 421a face each other).
Further, the engagement start position (tip) of the sliding part 413 and the rail part 424 and the engagement start position (tip) of the sliding part 423 and the rail part 414 are outside the yoke parts 411 and 421. Is the position. That is, when the speaker units 41 and 42 are brought close to each other with the contact surfaces 411a and 421a of the yoke parts 411 and 421 facing each other, the sliding part 413 and the sliding part 413 and The rail portion 424, the sliding portion 423, and the rail portion 414 are configured to engage with each other.
Note that the shapes of the sliding portions 413, 423 and the rail portions 414, 424 are not limited to those shown in the figure, and the movement of the speaker units 41, 42 in the direction parallel to the contact surfaces 411a, 421a as will be described later. Any shape may be used as long as it is prohibited and can only move in a direction perpendicular to the contact surfaces 411a and 421a.

4 is a cross-sectional view of the main part of the speaker units 41 and 42 as viewed from above. FIGS. 4A and 4B are positional correspondence relationships between the sliding part 413 and the rail part 424. FIG. ), (D) shows the positional correspondence between the sliding part 423 and the rail part 414.
In the speaker unit 41, as shown in FIGS. 4A and 4B, screw holes 413a and 413b formed in a direction parallel to the contact surface 411a are provided in the sliding portion 413. Similarly, in the speaker unit 42, as shown in FIGS. 4C and 4D, the sliding portion 423 is provided with screw holes 423a and 423b formed in a direction parallel to the contact surface 421a. Yes.
On the other hand, as shown in FIGS. 4A and 4C, screw holes 414a and 424a formed in a direction parallel to the contact surfaces 411a and 421a are provided in the rail portions 414 and 424, respectively. .
These screw holes 413a, 424a, 413b (an example of a screw hole forming portion) are arranged such that the movement of the speaker units 41, 42 is the movement of the speaker units 41, 42 is the sliding portion 413, the rail portion 424, and the rail. The contact surfaces 411a and 421a are overlapped with each other while the contact surfaces 411a and 421a of the yoke portions 411 and 421 are in contact with each other while being restricted by the respective engagement of the portion 414 and the sliding portion 423. It is provided at a position where one screw hole is formed in a parallel direction (see FIG. 4B).
Similarly, in the screw holes 423a, 414a, and 423b (an example of the screw hole forming portion), the movement of the speaker units 41 and 42 is caused by the sliding portion 413, the rail portion 424, the rail portion 414, and the sliding portion 423. One screw hole in a direction parallel to the contact surfaces 411a and 421a by being overlapped with each other while the contact surfaces 411a and 421a of the yoke portions 411 and 421 are in contact with each other. (See FIG. 4D).

The speaker units 41 and 42 thus configured are assembled as follows.
First, the sliding unit 413 and the sliding unit 423 are configured so that the speaker units 41 and 42 are brought close to each other with the contact surfaces 411a and 421a facing each other, so that the rail units 424 and 42 correspond to each other. The rail portion 414 is fitted. Accordingly, the movement of each of the speaker units 41 and 42 in the direction parallel to the contact surfaces 411a and 421a is performed between the sliding portion 413 and the sliding portion 423 and the rail portion 424 and the rail portion 414. Prohibited by engagement.
On the other hand, when the sliding parts 413 and 423 are engaged with the rail parts 424 and 414, the sliding parts 413 and 423 are perpendicular to the contact surfaces 411a and 421a along the rail parts 424 and 414. It is slidable in the direction (that is, the direction in which the speaker units 41 and 42 approach or separate from each other). Therefore, movement of the speaker units 41 and 42 in the direction perpendicular to the contact surfaces 411a and 421a is allowed. Here, the sliding portion 413, the rail portion 424, the sliding portion 423, and the rail portion 414 are an example of movement restricting means.

Thereafter, the speaker units 41 and 42 are brought closer to each other until the contact surfaces 411a and 421a come into contact with the contact surfaces 411a and 421a of the yoke portions 411 and 421 facing each other.
At this time, the movement of each of the speaker units 41 and 42 is caused by the engagement of the sliding portion 413 and the rail portion 424 and the engagement of the sliding portion 423 and the rail portion 423 with the contact surfaces 411a and 421a. Since only the movement in the vertical direction is allowed, the displacement in the direction parallel to the contact surfaces 411a and 421a of the speaker units 41 and 42 is also caused by the repulsive force acting between the yoke portions 411 and 421. Does not occur. Therefore, the assembling worker can easily move the speaker units 41 and 42 while aligning the predetermined center positions to bring the yoke portions 411 and 421 into contact with each other.
In this manner, the sliding portion 413 and the rail portion 424, the sliding portion 423 and the rail portion 414 are configured to be engaged at least before the yoke portions 411 and 421 come into contact with each other. In this case, misalignment due to the repulsive force between the yoke portions 411 and 421 when the yoke portions 411 and 421 are brought into contact with each other is prevented. Specifically, the sliding portion 413, the rail portion 424, the sliding portion 423, and the rail portion 414 are engaged before at least a repulsive force that cannot be controlled by the operator is applied. What is necessary is just to comprise. However, the sliding portion 413, the rail portion 424, the sliding portion 423, and the rail portion 414 are engaged with each other at a position where the repulsive force begins to act when the yoke portions 411, 421 approach each other. It is desirable from the viewpoint of workability.

Then, when the contact surfaces 411a and 421a of the yoke portions 411 and 421 face each other, the contact surfaces 411a and 421a come into contact with each other, so that the screw holes 413a and 424a, One screw hole is formed by 413b, and as shown in FIG. 4D, when one screw hole is formed by the screw holes 423a, 414a, and 423b, screws 413c and 423c are then inserted into the respective screw holes. (An example of a screwing member) is screwed and the speaker units 41 and 42 are fixed. Here, the screw holes 413a, 424a, 413b, the screw 413c, the screw holes 423a, 414a, 423b, and the screw 423c are examples of unit fixing means.
In addition, it is desirable that an adhesive is applied to one or both of the contact surfaces 411a and 421a of the yoke portions 411 and 421. As a result, when the contact surfaces 411a and 421a of the yoke portions 411 and 421 of the two speaker units 41 and 42 come into contact with each other, the screws 423c and 413c are easily screwed together. be able to.
In the speaker device 40 assembled in this way (see FIG. 2), the two speaker units 41 and 42 are in a state in which the yoke portions 411 and 421 are in contact with each other, that is, the contact surfaces 411a and 421a, respectively. Are held in contact with each other. Therefore, as described above, vibrations generated when the sound is output from the speakers 51 and 52 cancel each other out between the speaker units 41 and 42, and unnecessary sound (billing sound) in the speaker device 40 and the liquid crystal television X is obtained. And the shaking of the image display unit 10 is also prevented.

After that, the speaker device 40 is fixed to the liquid crystal television X by the fixing plate 12 as shown in FIG. Here, particularly in the liquid crystal television X, the speaker device 40 is arranged so that the direction in which the contact surfaces 411a and 421a of the yoke portions 411 and 421 face each other is parallel to the display surface of the video display unit 10. ing. As a result, the influence on the shaking of the video screen of the video display unit 10 is further reduced as compared with the case where each of the contact surfaces faces the display surface of the video display unit 10 in a perpendicular direction. This is particularly suitable when the video display unit 10 is large or thin.
Further, in the present embodiment, the speaker device 40 that performs low-frequency sound output has been described as an example of the speaker device according to the present invention. However, the present invention is not limited to a device that performs low-frequency sound output. The present invention can be applied to a speaker device that outputs sound in various sound ranges such as a sound range, a whole range, and a mid range.
Further, in the present embodiment, the case where the speaker device 40 is fixed to the main body chassis 11 of the video display unit 10 has been described as an example. However, the present invention is not limited thereto, and for example, the video display unit 10 is It is also conceivable as another embodiment that it is fixed to the supporting stand member 13. In this case, even if vibration is generated in the speaker device 40, the vibration is only transmitted to the video display unit 10 through the stand member 13. Therefore, the video screen of the video display unit 10 is shaken. Can be prevented more reliably.

DESCRIPTION OF SYMBOLS 10 ... Image | video display part 11 ... Main body chassis 12 ... Fixing plate 13 ... Stand member 20, 30, 40 ... Speaker apparatus 41, 42 ... Speaker unit 411, 421 ... Yoke part (an example of a magnetic circuit part)
413, 423 ... sliding portions 413a, 413b, 423a, 423b, 414a, 424a ... screw holes (an example of screw hole forming portions)
414, 424 ... rail portions 413c, 423c ... screws (an example of a screwing member)
51, 52 ... Speakers 61, 62 ... Speaker housing X ... Liquid crystal television (an example of a display device)

Claims (7)

Two speakers having a diaphragm and a magnetic circuit unit connected to the diaphragm are fixed with the magnetic circuit units in contact with each other back to back so that the reaction force of the vibration of the diaphragm cancels each other. A speaker device comprising:
Two speaker units that individually support the two speakers with the contact surface of the magnetic circuit portion exposed; and
Provided in the two speaker units and engaged with each other with the contact surfaces of the magnetic circuit portions of the speaker units facing each other, thereby prohibiting movement in a direction parallel to the contact surfaces of the speaker units. A movement restricting means for allowing movement of each of the speaker units in a direction perpendicular to the contact surface;
A unit that holds the contact state after the contact surfaces of each of the magnetic circuit units come into contact with each other when the speaker units are brought close to each other in a state in which movement in a direction parallel to the contact surface is restricted by the movement restricting means. Fixing means;
A speaker device comprising:   The unit fixing means forms a screw hole in a direction parallel to the contact surface when the movement is restricted by the movement restricting means and overlaps with the contact surfaces of the magnetic circuit portions in contact with each other. A screw hole forming portion provided in each of the speaker units, and a screwing member for fixing the two speaker units by being screwed into screw holes formed by the screw hole forming portion. Item 2. The speaker device according to Item 1. The movement restricting means provided on one of the speaker units includes a rail portion formed along a direction perpendicular to the contact surface of the magnetic circuit portion;
3. The speaker device according to claim 1, wherein the movement restricting means provided in the other speaker unit includes a sliding portion that slides along the rail portion.   The speaker device according to claim 1, wherein the contact surfaces of the magnetic circuit portions of the two speaker units are bonded by an adhesive applied to one or both of the contact surfaces.   A display device comprising the speaker device according to claim 1.   The display device according to claim 5, wherein the speaker device is arranged such that a direction in which the contact surfaces face each other is parallel to a display surface of an image display unit that displays an image. The display device according to claim 5, wherein the speaker device is fixed to a stand member that supports an image display unit that displays an image.

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