Speaker

Abstract

To provide a speaker capable of estimating a cause of a defect.SOLUTION: A speaker comprises: a magnet 101; a vibrator 102; a voice coil 103 for vibrating the vibrator 102; and a sensor 104 insulated from the voice coil 103 and including a closed loop of a conductor fused and cut under a predetermined fusing condition. The sensor 104 is arranged at a position where power is generated by fluctuation of a magnetic field to be generated by the voice coil 103.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a speaker. [Background technology]

[0002] In a speaker, if an excessive current is input to the voice coil, the voice coil may generate heat or burn out.

[0003] Patent Document 1 describes a speaker in which a drive current is passed through a voice coil via a fuse.

[0004] Furthermore, Patent Document 2 describes a speaker in which a breaker or a fuse is connected to a coil. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-320264 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-259247 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the voice coil of a speaker burns out and breaks down, there is a problem in that it is not possible to identify or estimate the cause of the failure, i.e., whether the burnout was caused by excessive input or by a factor other than excessive input. Also, with the speakers of Patent Documents 1 and 2, if the fuse blows, the speaker itself stops working, so there is a problem in that it is difficult to identify the cause of the speaker failure. [Means for solving the problem]

[0007] One embodiment of the speaker comprises a magnet, a vibrating body, a voice coil that vibrates the vibrating body, and a detector that is insulated from the voice coil and has a closed circuit of a conductor that melts and cuts under predetermined fusing conditions, and the detector is positioned at a position where electric power is generated by fluctuations in the magnetic field generated by the voice coil. [Effects of the Invention]

[0008] According to the speaker of the present disclosure, the cause of a speaker failure can be estimated. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a cross-sectional view showing a schematic configuration of a speaker according to a first embodiment. [Figure 2] 1 is a perspective view showing a schematic configuration of a speaker according to a first embodiment. [Figure 3] 1 is a perspective view showing a schematic configuration of a speaker according to a first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] For clarity of explanation, the following description and drawings have been omitted and simplified as appropriate. Furthermore, in each drawing, the same elements are given the same reference numerals, and duplicate explanations are omitted as necessary. For clarity of explanation, the following description will be made using an XYZ three-dimensional Cartesian coordinate system. With the speaker 100 as the reference, the front-to-back direction (depth direction) is defined as the Z direction, the left-to-right direction (horizontal direction) as the X direction, and the up-to-down direction (vertical direction) as the Y direction. The front direction is defined as the +Z direction, the rear direction as the -Z direction, the right direction as the +X direction, the left direction as the -X direction, the up direction as the +Y direction, and the down direction as the -Y direction.

[0011] Embodiment 1 Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a cross-sectional view showing a schematic configuration of a speaker according to the first embodiment. In Fig. 1, speaker 100 includes magnet 101, vibrating body 102, voice coil 103, detector 104, frame 105, damper 106, edge 107, plate 108, yoke 109, and cap 110.

[0012] The magnet 101 is, for example, a permanent magnet.

[0013] The vibrating body 102 is physically connected to the voice coil 103. Vibration of the vibrating body 102 generates vibrations in the air (compression waves). For example, the vibrating body 102 has a ring shape. The cross-sectional shape of the vibrating body 102 can be any shape, but it may also have a curved shape as shown in FIG. 1. It is also preferable that the vibrating body 102 is made of synthetic resin, paper, cloth, or the like.

[0014] Magnet 101 forms a closed magnetic field circuit with iron materials such as magnet 101, plate 108, and yoke 109. Voice coil 103 receives electromagnetic force from the magnetic field formed in the gap around the closed magnetic field circuit in accordance with changes over time in the current of an electrical signal applied to voice coil 103, causing it to vibrate in the front-to-back direction (Z direction) of speaker 100. The vibration of voice coil 103 then causes vibrating body 102 to also vibrate in the front-to-back direction (Z direction) of speaker 100. This vibration enables speaker 100 to emit sound.

[0015] The detector 104 has a closed circuit of a conductor that melts and cuts under predetermined conditions. In the following description, the conditions for melting and cutting the detector 104 may be referred to as the "cutting conditions." The detector 104 is, for example, a donut-shaped conductor. The detector 104 may be a coil in which a conductor is wound multiple times in a spiral or vortex shape, as long as the closed circuit connects the start and end points. Here, the detector 104 is preferably formed in a circular shape, but is not limited to this, and may also be elliptical or rectangular. The detector 104 is insulated from the voice coil 103. The detector 104 is fixed at a position where power is generated by fluctuations in the magnetic field generated by power applied to the voice coil 103. The detection principle of the detector 104 will be described in detail below.

[0016] For example, the detector 104 is disposed so that the central axis of the voice coil 103 is located inside the closed circuit of the detector 104. More specifically, it is desirable to dispose the detector 104 so that the central axis of the voice coil 103 is located near the central axis of the detector 104. Here, the central axis of the detector 104 is the central axis of the speaker 100, and the central axis of the voice coil 103 is the central axis of the loop formed by the winding of the closed circuit of the detector 104.

[0017] For example, detector 104 is arranged so that the plane on which voice coil 103 is wound is the same as or similar to the plane formed by the winding of the closed circuit of detector 104. For example, if the plane on which voice coil 103 is wound is the XY plane as shown in Figure 1, the plane formed by the closed circuit of detector 104 is also the XY plane.

[0018] For example, the detector 104 may be fixed to the outer surface of the speaker 100, that is, to the side visible to a user using the speaker 100. By fixing the detector 104 to the outer surface of the speaker 100, it is possible to visually determine that the failure is due to excessive power being applied to the coil without disassembling the speaker. For example, the detector 104 is fixed to the surface of the cap 110, as shown in FIG. 1 . The detector 104 may also be disposed on a location other than the outer surface of the speaker 100. Details of the arrangement of the detector 104 will be described later.

[0019] The melting conditions of the detector 104 can be set arbitrarily depending on the positional relationship between the detector 104 and the voice coil 103, the thickness of the conductor wire of the closed circuit, and the resistance value of the conductor wire. The melting conditions of the detector 104 will be described in detail later. Furthermore, the speaker 100 may have multiple detectors 104 with different melting conditions.

[0020] The frame 105 is a frame that supports each component of the speaker 100 .

[0021] The damper 106 physically connects the voice coil 103 and the frame 105, and holds the voice coil 103 in an accurate position while it moves up and down (in the Z direction).

[0022] Edge 107 physically connects vibrating body 102 to frame 105 and holds vibrating body 102 in a precise position.

[0023] Next, the principle of the detector 104 will be described. Fig. 2 is a perspective view showing a schematic configuration of the speaker according to the first embodiment. In this example, unlike Fig. 1 in which the detector 104 is arranged on the outer surface of the speaker 100, as shown in Fig. 2(a), an example will be described in which the detector 104 is arranged on the upper part (+Z side) of the yoke 109, which is not on the outer surface of the speaker 100.

[0024] When a current flows through the voice coil 103, a magnetic field is generated in a direction perpendicular to the plane around which the voice coil 103 is wound. Specifically, the magnetic field is generated in the vertical direction (Z direction) as shown by the arrow in Figure 2(b). As the current in the voice coil 103 changes in response to the sound to be generated, this magnetic field also changes.

[0025] The change in the magnetic field generated by the voice coil 103 causes electromagnetic induction in the detector 104, and a current flows in the detector 104 as shown by the arrow in FIG. 2(c).

[0026] The value of the current flowing through the detector 104 varies in proportion to the magnitude of the generated magnetic field fluctuation. Therefore, the value of the current flowing through the detector 104 (in other words, the value of the applied power) is proportional to the magnitude of the electrical signal input to the voice coil 103.

[0027] The melting condition of the detector 104 can be set based on the relationship between the electric signal input to the voice coil 103 and the current value (or power value) generated in the detector 104 by electromagnetic induction. In other words, the condition can be set so that the detector 104 melts at the current value (or power value) generated in the detector 104 that corresponds to the power value input to the voice coil 103 to be detected.

[0028] In the following description, the power value input to voice coil 103 to be detected may be referred to as the detection power value. The detection power value may be, for example, the maximum power value that can be input to voice coil 103. In other words, by setting the melting condition to the power value generated in detector 104 corresponding to the maximum power value that can be input to voice coil 103, if detector 104 melts when speaker 100 breaks down, it can be assumed that the cause of the failure is burnout due to excessive input, and if detector 104 does not melt down, it can be assumed that the failure is due to some other cause. A cause of failure other than excessive input is, for example, a mechanical failure.

[0029] If the speaker 100 has a plurality of detectors 104, each detector 104 may be set to blow out under a different blowout condition. For example, consider a case where the blowout condition of an arbitrary detector 104 is set to a power value generated in the detector 104 corresponding to the maximum power value that is allowed to be input to the voice coil 103. In this case, the blowout condition of another detector 104 other than the arbitrary detector 104 is set to a power value that is lower than the blowout condition of the arbitrary detector 104. In this way, by having a plurality of detectors 104 in the speaker 100 and setting different blowout conditions for each, the maximum power value input to the voice coil 103 can be estimated more precisely.

[0030] By being able to estimate the maximum power value input to the voice coil 103 more precisely, it is possible to check whether the detector 104 has blown during a vehicle inspection, even if the speaker 100 is not malfunctioning. If none of the multiple detectors 104 have blown, it can be estimated that only a power value below the detection power values ​​corresponding to multiple blown conditions has been input to the voice coil 103. If at least one of the multiple detectors 104 has blown, it can be estimated that a power value corresponding to the blown condition of the blown detector 104 has been input to the voice coil 103. This makes it possible to understand the usage status of speakers in the market and to use this as a reference for the design value of the speaker's allowable power.

[0031] Next, the position of the detector 104 will be described. Fig. 3 is a perspective view showing a schematic configuration of the speaker according to the first embodiment. In Fig. 3, the detectors 104 of the speaker 100 are arranged at positions 104-1, 104-2, 104-3, and so on.

[0032] Detector 104 may be placed at the position indicated by 104-1, that is, on the surface of edge 107, which is on the outer surface of speaker 100. When detector 104 is placed at position 104-1, it can be placed without interfering with other components of speaker 100, which has the advantage of having little impact on the production of speaker 100.

[0033] The detector 104 may be disposed at the position indicated by 104-2, that is, on the surface of the cap 110, which is on the external surface of the speaker 100. The position indicated by 104-2 is the same as the position of the detector 104 shown in Fig. 1. When the detector 104 is disposed at the position 104-2, since it is disposed on the external surface of the speaker 100, it becomes easy to check whether the detector 104 has blown out.

[0034] Detector 104 may be disposed at a position indicated by 104-3, that is, near magnet 101 but not on the outer surface of speaker 100. The position of detector 104 indicated by 104-3 is, for example, the upper part (+Z side) of yoke 109, but is not limited to this configuration and may be disposed on other iron material, such as the upper part (+Z side) of plate 108. The position indicated by 104-3 is the same as the position of detector 104 shown in FIG. 2. When detector 104 is disposed at position 104-3, detector 104 is close to voice coil 103. Therefore, when the same power value is input to voice coil 103, the power value generated in detector 104 can be made larger than at other positions, and it can be accurately detected that the power value to be detected has been input to voice coil 103.

[0035] In this way, with the speaker of the embodiment, it is possible to estimate whether the cause of the failure is burnout due to excessive input that exceeds the capacity of voice coil 103.

[0036] Furthermore, with the speaker of the embodiment, by recording the cause of a malfunction, it is possible to grasp the usage status of the speaker in the market.

[0037] Furthermore, with the speaker of the embodiment, it is possible to determine whether the cause of the failure is burnout due to excessive input, without making any changes to the general speaker manufacturing method or structure.

[0038] Furthermore, with the speaker of the embodiment, it is possible to determine whether the cause of the failure is burnout due to excessive input by adding an inexpensive component.

[0039] The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the present invention. For example, it is desirable to arrange the detector 104 so that the central axis of the voice coil 103 is inside the closed circuit of the detector 104, but the central axes of the voice coil 103 and the detector 104 do not have to be coaxial. The central axes of the voice coil 103 and the detector 104 may be misaligned. Furthermore, the plane on which the voice coil 103 is wound and the plane on which the winding of the closed circuit of the detector 104 is formed may be inclined.

[0040] Alternatively, the detector 104 and the speaker 100 may be manufactured separately, and the detector 104 may be fixed to the speaker 100 when the speaker 100 is used.

[0041] The detector 104 may also be formed as a closed circuit by forming a one-turn coil on a specific surface of the cap 110 of the speaker 100 by vapor deposition, for example. Multiple strips of foil with different widths may be vapor deposited on the cap of the speaker 100, so that the input value can be read when the speaker 100 is damaged.

[0042] The detector 104 may also be attached to a model name sticker on the back of the speaker 100 . [Explanation of symbols]

[0043] 100 speakers 101 Magnet 102 vibrator 103 voice coil 104 detector 105 frames 106 Damper 107 Edge 108 Plate 109 York 110 Cap

Claims

1. A magnet and A vibrating body; a voice coil that vibrates the vibrating body; a detector insulated from the voice coil and having a closed circuit of a conductor that melts and cuts under predetermined fusing conditions; The detector is a speaker placed at a position where electric power is generated by fluctuations in the magnetic field generated by the voice coil.

2. 2. The speaker according to claim 1, wherein the detector is disposed so that a central axis of the voice coil is located inside a closed circuit of the detector.

3. 2. The speaker according to claim 1, wherein the melting condition is a power value generated in the detector corresponding to a maximum power value allowed to be input to the voice coil.

4. The speaker according to claim 1 , further comprising a plurality of the detectors each having a different blowout condition.

5. The speaker according to claim 1 , wherein the detector is fixed on an outer surface of the speaker.

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