JP5973809B2 - Speaker device and display device - Google Patents

Description

  The present invention relates to a speaker device and a display device, for example, a speaker device suitable for a device having a limited installation space such as a thin display device, and a display device including such a speaker device.

  In recent years, televisions have become thinner and lighter, and applications such as hanging on walls have become common. Against this background, there is an increasing demand for thinner and lighter speakers mounted on televisions. In addition, it is also required that the housing and the like hardly vibrate on the assumption that it is wall-mounted.

  For example, there is a woofer speaker device 210 as shown in FIG. The woofer speaker device 210 includes two sets of bass reflex ports 240 and speakers 220 in a box 230, and the two speakers 220 are back to back. By adopting this configuration, there is a feature that vibration such as chatter is hardly generated even if the vibration is canceled and incorporated in a television or the like.

  Further, as a technique for realizing a reduction in the size of a speaker device, there is a configuration in which a vibration generator is provided and a diaphragm is driven by a vibration wave motor driven by a progressive vibration wave (see, for example, Patent Document 1). Specifically, the vibration generator includes a vibration wave motor, a drive member having a central portion fixed to the output shaft of the vibration wave motor, a first diaphragm, a second diaphragm, and a first A first transmission member having one end fixed to the diaphragm and transmitting the movement of the driving member to the first diaphragm, and an end fixed to the second diaphragm and transmitting the movement of the driving plate to the second diaphragm A second transmission member. Then, the drive member drives the first transmission member and the second transmission member with a point-symmetric position at the center as an action point.

JP 2000-225377 A

  By the way, in the technique shown in FIG. 1, it is necessary to increase the number of back-to-back speakers 220 in order to increase the area of the vibration part. Was demanded.

  In the technique disclosed in Patent Document 1, the structure / principle is complicated in that the vibration wave motor is a premise, and that the diaphragm is driven by converting the rotational motion into a linear motion. There was a problem and another technology was required. In addition, although the two diaphragms are driven, there is a problem that they are not symmetrical so as to completely cancel the action and reaction. From this viewpoint, another technique has been demanded.

  This invention is made | formed in view of the above situations, Comprising: It aims at providing the technique which solves the said subject.

The speaker device of the present invention is attached to the housing so as to be rotatable about the intermediate point as a fulcrum with the same rotation axis as the first arm, the first arm being rotatably attached to the housing with the intermediate point as a fulcrum. And the diaphragm provided on both ends of each of the first arm and the second arm, and the diaphragm on each of the first arm and the second arm. A vibration circuit comprising a voice coil and a magnetic circuit that are driven in response to a signal, wherein the first arm and the second arm are driven in opposite directions by the vibration circuit, and the diaphragm is Operate to face each other.
Further, the rotation direction of the arm may be switched depending on the polarity of the audio signal.
A third arm that is attached to the housing so as to be rotatable about the intermediate point on the same rotation axis as the first arm; and an intermediate point on the same rotation axis that is integrated with the second arm. A fourth arm that is rotatably attached to the housing, and a diaphragm provided at each end of each of the third arm and the fourth arm, and the third arm The arm and the fourth arm may not be provided with a vibration circuit for driving the diaphragm.
The display device of the present invention includes the speaker device described above.

  ADVANTAGE OF THE INVENTION According to this invention, while a speaker apparatus has a limit in box capacity, a favorable characteristic can be acquired and the technique which can reduce generation | occurrence | production of an unnecessary vibration can be provided.

It is a figure which shows typically the woofer speaker apparatus based on a prior art. It is a perspective view of the speaker apparatus based on embodiment. It is a top view which shows typically the internal structure of the speaker apparatus based on embodiment. It is an enlarged view which shows typically the central rotating part vicinity in the internal structure of the speaker apparatus based on embodiment. It is a perspective view which shows typically the structure of the speaker main body installed in one edge part of one arm based on embodiment. It is a top view which shows typically the internal structure of the speaker apparatus based on the modification 1 of embodiment. It is a top view which shows typically the internal structure of the speaker apparatus based on the modification 2 of embodiment. It is a top view which shows typically the internal structure of the speaker apparatus based on the modification 3 of embodiment.

  Next, modes for carrying out the present invention (hereinafter, simply referred to as “embodiments”) will be specifically described with reference to the drawings.

  FIG. 2 is a perspective view of the speaker device 10 according to the present embodiment, in which four speaker bodies 50 (50a, 50b) are provided in a box 30 which is a substantially cylindrical casing. The speaker device 10 is mounted on, for example, a liquid crystal television. FIG. 3 is a plan view schematically showing the internal structure of the speaker device 10. 4 is an enlarged view of the vicinity of the axial center of the speaker device 10 (near the central rotating portion 20), FIG. 4 (a) is a cross-sectional view, and FIG. 4 (b). FIG. FIG. 5 is a perspective view schematically showing the configuration of the speaker main body 50 installed at one end of one arm 25.

  The box 30 has a shape such that a columnar body whose upper bottom surface is substantially fan-shaped is removed so as to be symmetrical in plan view. The sector-shaped central angle α and the offset angle θ of the arm 25 described later coincide (or substantially coincide). The speaker main body 50 is provided on each of four vertical surfaces (speaker installation surfaces 38) formed in the radial direction of the removed portion via edges 55.

  In the drawing, the speaker body 50 provided in the counterclockwise direction is referred to as a first speaker body 55a, and the speaker body 50 provided in the clockwise direction is referred to as a speaker body 50b. Therefore, the first speaker body 50a and the second speaker body 50b are arranged to face each other in the space of the one columnar body that has been removed.

  The first speaker body 50a and the second speaker body 50b have the same shape and the same characteristics. Here, a substantially rectangular shape is adopted. As described later, the first speaker main body 50a and the second speaker main body 50b are driven in the opposite directions by the audio signals having the same polarity, as will be described later. This is to counteract each other's reactions.

  Further, as shown in FIGS. 3 and 4, in the speaker device 10, the first and second arms 25a and 25b having the same length are attached to the box 30 so as to be rotatable by the central rotating portion 20 near the respective centers. It has been. Note that when the first arm 25a and the second arm 25b are not particularly distinguished, each is simply referred to as an arm 25. Further, the phrase “rotatable near the center” means that the center axis can be rotated. As described above, the speaker body 50 is provided at the end of the arm 25, and the speaker body 50 is connected to the box via the edge 55. In practice, the movement is limited to a predetermined range.

  Specifically, the two first arms 25a are formed to extend symmetrically with a predetermined length from the cylindrical first arm support portion 22 located at the center in the radial direction outward direction. More specifically, as shown in FIGS. 4A and 4B, each first arm 25a extends in the vertical horizontal direction from the vicinity of the center of the height of the cylindrical side surface to the outside, and has a height in the middle. One end is bent so that the position is lowered by one step and becomes the bottom surface of the cylindrical shape.

  Similarly, two second arms 25b are formed to extend symmetrically with a predetermined length from the cylindrical second arm support portion 23 located in the center in the radial direction outward direction. The second arm support portion 23 is disposed with a coaxial shaft portion 21 below the first arm support portion 22. More specifically, each of the second arms 25b extends in the vertical and horizontal directions from the vicinity of the center of the height of the cylindrical side surface to the outside, so that the height position rises one step in the middle to reach the cylindrical top surface level. One end is bent.

  Therefore, the first arm 25a and the second arm 25b are arranged so that the first arm support portion 22 is positioned at a height after being bent at each of the first arm support portion 22 and the second arm support portion 23. The position is the same.

  As shown in FIG. 3, the extending direction of the first arm 25a and the second arm 25b is set so as to form a predetermined offset angle θ in plan view.

  And the 1st speaker main body 50a is attached to the both ends of the extension direction of the 1st arm 25a, respectively. That is, the two first speaker bodies 50a are attached so as to be symmetrical with each other about the first arm support portion 22 (shaft portion 21).

  Further, a voice coil 40 and a magnetic circuit 45 are provided as an oscillation circuit of the first speaker main body 50a at an intermediate portion of the first arm 25a. This vibration circuit can be realized with a general configuration.

  Similarly, the second speaker body 50b is attached to both ends of the second arm 25b in the extending direction. That is, the two second speaker bodies 50b are attached so as to be symmetrical with each other around the second arm support portion 23 (shaft portion 21).

  Furthermore, a voice coil 40 and a magnetic circuit 45 are provided as an oscillation circuit of the second speaker main body 50b in the middle portion of the second arm 25b, similarly to the first speaker main body 50a.

  The four voice coils 40 are connected to a drive circuit 80 that outputs audio signals, so that the speaker body 50 vibrates as desired. The direction of rotation is switched clockwise or counterclockwise depending on the polarity (+/−) of the audio signal. In the present embodiment, the first arm 25a and the second arm 25b are driven in opposite directions. That is, the first speaker body 50a and the second speaker body 50b move to face each other.

  More specifically, the first arm support portion 22 and the second arm support portion 23 are formed to be independently rotatable around the same shaft portion 21 as a center (fulcrum). Further, the first arm support portion 22 and the second arm support portion 23 are driven to rotate in opposite directions. Accordingly, the reaction against the movement of the first and second arm support portions 22 and 23 is in a direction to cancel each other. That is, the movements of the first speaker body 50a provided in the first arm support portion 22 and the second speaker body 50b provided in the second arm support portion 23 are reversed, and the first and second speaker bodies 50a are reversed. 50b cancels the action on the box 30 due to the drive. As a result, the box 30 does not generate unnecessary vibration.

  In particular, since it is possible to ensure a sufficient stroke in the bass characteristic, good characteristics can be realized even when the capacity of the box 30 is limited.

  Further, since the voice coil 40 and the magnetic circuit 45 are provided in the middle of the arm 25 (25a, 25b), the stroke of the speaker body 50 can be increased. Furthermore, since the speaker body 50 (50a, 50b) is fixed to the arm 25 (25a, 25b), a damper required for a general dynamic speaker is not necessary.

  Since the vibration characteristics of the box 30 may change depending on the shape of the box 30 and the like, the shape and characteristics of the first speaker body 50a and the second speaker body 50b are naturally changed and adjusted. Also good. The lengths of the first arm 25a and the second arm 25b may also be adjusted for the same reason.

  The present invention has been described based on the embodiments. This embodiment is an exemplification, and it is understood by those skilled in the art that various modifications can be made to combinations of the respective components and the like, and such modifications are within the scope of the present invention.

  For example, FIG. 6 shows a speaker device 110 according to the first modification. As shown, in addition to the first and second speaker bodies 150a and 150b and the first and second arms 125a and 125b, the voice coil 140, and the magnetic circuit 145, which are driving structures thereof, as shown in FIG. As the same structure, a pair of upper and lower first and second speaker bodies 150a, 150b and first and second arms 125a, 125b, a voice coil 140, and a magnetic circuit 145 are added. ing.

  That is, four first arms 125a extend in a cross shape from the first arm support portion 122, and a total of four first speaker bodies 150a are provided at the respective ends. Similarly, four second arms 125b extend from the second arm support portion 123 in a cross shape, and a total of four second speaker bodies 150b are provided at the respective ends. Thus, even when the speaker main body 150 is increased, the speaker device 110 can be realized without increasing the size.

  FIG. 7 shows a speaker device 110b according to the second modification, which is a partial modification of the speaker device 110 shown in FIG. Specifically, a pair of upper and lower first and second speaker bodies 150a and 150b and first and second arms 125a and 125b, which are added to FIG. Instead of the magnetic circuit 145, only a pair of upper and lower third and fourth speaker bodies 250a and 250b and third and fourth arms 225a and 225b are added. That is, the voice coil 140 and the magnetic circuit 145 constituting the vibration circuit are not added. In this case, the first arm 125a and the third arm 225a are provided on the same central rotating portion 120 (first arm support portion 122). Similarly, the 2nd arm 125b and the 4th arm 225b are provided in the same center rotation part 20 (2nd arm support part 123). For this reason, it is preferable to reinforce the structure of the drive part of the drive circuit 80 and the like (including the voice coil 140 and the magnetic circuit 145 in some cases).

  FIG. 8 shows a speaker device 10b according to the third modified example, and bass reflex ports 90 are provided at two locations on the upper and lower sides in the configuration shown in the embodiment of FIG. That is, although the sealed box 30 is used in the first embodiment, a non-sealed box 30b is used in this modification.

  Further, for example, a passive radiator may be provided instead of the bass reflex port of the above-described modified example. Naturally, a configuration in which the above-described embodiment and modification examples are combined may be employed.

10, 10b, 110, 110b Speaker device 20, 120 Center rotation part 21 Shaft part 22, 122 First arm support part 23, 123 Second arm support part 25 Arm 25a, 125a First arm 25b, 125b Second Arms 30, 30b Box 38 Speaker installation surface 40, 140 Voice coil 45, 145 Magnetic circuit 50, 150 Speaker main body 50a, 150a First speaker main body 50b, 150b Second speaker main body 55 Edge 80 Drive circuit 90 Bass reflex port 250a Third speaker body 250b Fourth speaker body 225a Third arm 225b Fourth arm

Claims (4)

A first arm that is rotatably attached to the housing with the midpoint as a fulcrum;
A second arm attached to the housing so as to be rotatable about an intermediate point on the same rotational axis as the first arm;
Diaphragms provided at both ends of each of the first arm and the second arm;
Each of the first arm and the second arm has a vibration circuit including a voice coil and a magnetic circuit for driving the diaphragm according to an audio signal,
The speaker device according to claim 1, wherein the first arm and the second arm are driven in opposite directions by the vibration circuit, and the diaphragm operates to face each other.   The speaker device according to claim 1, wherein a rotation direction of the arm is switched according to a polarity of the audio signal. A third arm that is attached to the housing so as to be rotatable about the intermediate point on the same rotation axis as the first arm,
A fourth arm that is attached to the housing so as to be rotatable about the middle point as a fulcrum on the same rotation axis as the second arm;
Diaphragms provided at both ends of each of the third arm and the fourth arm;
Have
The speaker device according to claim 1 or 2, wherein the third arm and the fourth arm are not provided with a vibration circuit for driving the diaphragm.   A display device comprising the speaker device according to claim 1.

Images