JP2014138348A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker device capable of reducing the cost compared to conventional ones.SOLUTION: The speaker device includes: a magnet 1; a pair of diaphragms 3 each having a wire coil 2 disposed to enclose the magnet 1; and a housing 5 which holds the diaphragm 3 and has air ports 4. The speaker device is arranged so that currents flow in the opposite directions on the wire coils disposed on the respective diaphragms 3. The speaker device may be arranged to have reflectors disposed parallel to the diaphragm 3 separated away therefrom.

Description

  The present disclosure relates to a speaker device used for audio equipment.

  In recent years, plasma displays and liquid crystal displays have been made thinner and thinner in the depth direction. A speaker device that can be applied to such a thin display device has also been developed (Patent Document 1).

JP 2012-222770 A Japanese Patent Laid-Open No. 3-116961 JP 2006-336641 A

  The speaker device described in Patent Document 1 has a configuration in which a plurality of speakers (for example, eight) are connected. Each speaker is provided with one magnet corresponding to one diaphragm. Therefore, although a speaker device composed of eight speakers requires eight magnets, the magnet is relatively expensive, which contributes to the high cost of the speaker device.

  Further, from the viewpoint of increasing the output per unit volume of the speaker device, a configuration in which a plurality of diaphragms are arranged in a stack is conceivable. Although such a structure is different from the speaker device as in the present invention, it is adopted in a heat dissipation device (see Patent Documents 2 and 3). However, the heat dissipating devices of Patent Documents 2 and 3 employ a structure in which both sides of the diaphragm are sandwiched between a pair of magnets (two magnets), which is also expensive. Moreover, if a magnet is attached to a diaphragm, a diaphragm will become heavy. Furthermore, in order to hold the magnet, it is necessary to increase the thickness of the diaphragm. As a result, it is difficult to reproduce high-frequency sound by inhibiting divided resonance. That is, it cannot be said that it is effective to apply the technology of the heat dissipation device as found in Patent Documents 2 and 3 to the speaker device.

  Accordingly, an object of the present invention is to provide a speaker device that is lower in cost than a conventional speaker device and has a large output per unit volume.

  A speaker device according to the present disclosure includes a magnet, a diaphragm having a winding coil disposed to face the magnet, and a housing having an air inlet / outlet for holding the diaphragm, and is disposed on the diaphragm. The current flowing through each winding coil is reversed.

Since the speaker device in the present disclosure sandwiches a magnet with a thin coil attached to the diaphragm, only one magnet is required, and the entire device can be thinned. Further, since the diaphragm can be made the same as a normal speaker, High sound playback is also possible. Also, since there are two diaphragms, sound volume can be secured even if the magnetic force is reduced.

Cross-sectional view of the speaker device according to Embodiment 1 Cross-sectional view of the configuration of the speaker device in the second embodiment Cross-sectional view of the configuration of the speaker device in the third embodiment Cross-sectional view of the configuration of the speaker device in the fourth embodiment

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

  The inventor (s) provides the accompanying drawings and the following description in order for those skilled in the art to fully understand the present disclosure, and is intended to limit the subject matter described in the claims. Not what you want.

(Embodiment 1)
The first embodiment will be described below with reference to FIG.

[1-1. Constitution]
FIG. 1 is a sectional view of the configuration of the speaker device according to the first embodiment.

This speaker device includes a magnet 1, a diaphragm 3 having a winding coil 2 disposed opposite to the magnet 1, a housing 5 having an air inlet / outlet 4 for holding the diaphragm 3, and magnetism. A metal plate surrounding the magnet is provided for guidance.

[1-2. Operation]
The operation of the speaker device configured as described above will be described below.

The magnetic field of the magnet 1 flows from the upper N pole to the lower S pole while spreading the magnetic field from the upper N pole to the magnetic induction metal plate 9, so that a magnetic field crossing the winding coil 2 is generated. For example, assuming that the current of the winding coil 2 on the magnet N pole side flows from the right to the left winding coil 2, the diaphragm 3 moves upward according to Fleming's left-hand rule. Similarly, when the current of the winding coil 2 on the S pole side is made to flow from right to left as in the upper part, the diaphragm 3 moves downward. As a result, air in the front space A of both the N pole side and S pole side diaphragms 3 is pushed out.

[1-3. Effect]
In the present embodiment, the diaphragm 3 differs from the configurations disclosed in Patent Documents 2 and 3 by devising the current flowing through the winding coil 2, so that two diaphragms are formed by one magnet. Can be driven. It can also play up to high sounds.

(Embodiment 2)
The first embodiment will be described below with reference to FIG.

[2-1. Constitution]
FIG. 2 is a sectional view of the configuration of the speaker device according to the first embodiment.

This speaker device includes a magnet 1, a diaphragm 3 having a winding coil 2 disposed opposite to the magnet 1, and a housing 5 having an air inlet / outlet 4 for holding the diaphragm 3.
A sound hole 6 disposed in parallel with the diaphragm 3 and a reflector 7 having an air inlet / outlet 4 are provided.

[2-2. Operation]
The operation of the speaker device configured as described above will be described below.

The magnetic field of the magnet 1 runs from the upper N pole to the lower S pole, and a magnetic field is generated across the winding coil 2 at that time. For example, assuming that the current of the winding coil 2 on the magnet N pole side flows from the right to the left winding coil 2, the diaphragm 3 moves upward according to Fleming's left-hand rule. Similarly, when the current of the winding coil 2 on the S pole side is made to flow from right to left as in the upper part, the diaphragm 3 moves downward. As a result, air in the front space A of both the N-pole and S-pole diaphragms 3 is pushed out, guided to the reflector 7 and simultaneously discharged from the sound hole 6.

[2-3. Effect]
Also in the present embodiment, the diaphragm 3 can drive the two diaphragms with one magnet by devising the current flowing through the winding coil 2. It can also play up to high sounds.

(Embodiment 3)
As shown in FIG. 3, the direction of the sound hole 6 of the reflector 7 on the S pole side may be reversed from the N pole side, and a signal different from the N pole side may be reproduced on the S pole side. In this case, when not particularly concerned about low-frequency interference, it is not necessary to reverse the direction of the electrode flowing through the coil to the N side.

(Embodiment 4)
In the first embodiment, the reflector 7 is disposed on the front side of the diaphragm 3 to guide the high sound, and the sound is reflected. However, if only the low sound is reproduced, the reflector 7 is not necessary, as shown in FIG. N pole side and S
By connecting the pole-side casing 5 to the box 8, it can be sealed and a woofer box can be configured.

  As described above, each embodiment has been described as an example of the technique disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed. It is also possible to combine the components of each embodiment into a new embodiment.

  Of course, the speaker device according to the present disclosure can be used in any usage state from the beginning if the winding direction of the coil is installed with the N pole side and the S pole side arranged in reverse. There is no need to separate the polarities of the electrodes, and the shape of the diaphragm is not particularly specified. They are listed separately for explanation of the principle.

  Moreover, since the above-mentioned embodiment is for demonstrating the technique in this indication, a various change, replacement, addition, abbreviation, etc. can be performed in a claim or its equivalent range.

  The present disclosure is applicable to a speaker device mounted on an electronic device. Specifically, the present disclosure is applicable to a flat-screen television, a computer display with a speaker, a mobile phone with a camera function, a smartphone, and the like. It can also be applied to furniture and interiors with built-in sound systems.

DESCRIPTION OF SYMBOLS 1 Magnet 2 Winding coil 3 Diaphragm 4 Air inlet / outlet 5 Case 6 Sound hole 7 Reflector 8 Box 9 Metal plate
A Front space

Claims (2)

Magnets,
A pair of diaphragms having a winding coil disposed so as to sandwich the magnet;
While holding the diaphragm, provided with a housing having an air inlet and outlet,
A speaker device characterized by reversing the current flowing through each winding coil disposed on the diaphragm.   2. The speaker device according to claim 1, further comprising a reflector arranged in parallel with the diaphragm and spaced apart from the diaphragm.