speaker

Abstract

To provide a technique for suppressing damage to a speaker even when an excessive current exceeding the maximum input is inputted into the speaker.SOLUTION: A speaker 200 includes at least a terminal plate 230, a vibrating portion, a tinsel wire 250, and an elastic member 260 arranged around the tinsel wire 250. The vibration portion of these is configured by including a voice coil and a diaphragm 220. The tinsel wire 250 connects the terminal plate 230 to the voice coil. The elastic member 260 is deformed by the moving stress imposed on the tinsel wire 250 in accordance with the vibration of the vibrating portion.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a speaker, and particularly to a speaker that vibrates a diaphragm.

Background Art

[0002] A speaker includes a frame, a vibrating part attached to the frame, a magnetic circuit part attached to the frame, and a terminal board attached to the frame. The speaker supplies an audio current to the voice coil of the vibrating part, and the voice coil cooperates with the magnetic circuit part according to the audio current to vibrate the diaphragm, thereby generating a sound corresponding to the audio current from the diaphragm. In such a speaker, it is desired to suppress the generation of abnormal noise due to the contact between the brocade wire and the frame. For this purpose, for example, a buffer member is provided (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When an input exceeding the maximum input of the speaker is input from the amplifier side, when the diaphragm protrudes in the speaker sound emission direction, the brocade wire may be taut. When the brocade wire is taut and the voice coil is pulled, if the voice coil is inclined, friction may occur between the voice coil and the magnetic circuit, leading to the possibility of disconnection or damage.

[0005] The present invention has been made in view of such a situation, and its object is to provide a technique for suppressing damage to the speaker even when an excessive current exceeding the maximum input is input.

Means for Solving the Problems

[0006] To solve the above problems, a speaker according to one aspect of the present invention comprises a terminal board, a vibrating section including a voice coil and a diaphragm, a wire connecting the terminal board and the voice coil, and an elastic member arranged around the wire. The elastic member deforms due to the moving stress generated in the wire in response to the vibration of the vibrating section. [Effects of the Invention]

[0007] According to the present invention, damage to the speaker can be suppressed even when an excessive current exceeding the maximum input is input. [Brief explanation of the drawing]

[0008] [Figure 1] This is a cross-sectional view showing the structure of a speaker used for comparison in this embodiment. [Figure 2] Figures 2(a) and 2(b) are cross-sectional perspective views showing the structure of the speaker in Figure 1 during lower and upper stroke. [Figure 3] This is a cross-sectional view showing the structure of the speaker according to this embodiment when there is no input. [Figure 4] Figure 3 is a partial perspective view showing the structure of the speaker when there is no input. [Figure 5] This is a cross-sectional view showing the structure of the speaker during its upper stroke according to this embodiment. [Figure 6] This is a partial perspective view showing the structure of the speaker during its upper stroke according to this embodiment. [Modes for carrying out the invention]

[0009] Before describing the present invention in detail, let's first outline it. The embodiment of the present invention relates to a speaker that outputs sound by vibrating a diaphragm with a voice coil. The voice coil of the vibrating system and a terminal plate provided on the frame are connected by a wire. Generally, the wire is placed between the diaphragm of the vibrating system and the damper. The wire has a length appropriate to the speaker's specifications (maximum input of the speaker, expected maximum amplitude). If the wire is too short, it will brace itself before the expected amplitude is reached, limiting the vibration of the diaphragm. If the wire is too long, the wire will flex and come into contact with the vibrating system, generating abnormal noise. As a result, the speaker's basic performance cannot be achieved. Therefore, the wire should not be set too short, but rather to a length that is not too long while still allowing for some slack.

[0010] As mentioned above, if an input exceeding the speaker's maximum input is input from the amplifier, in other words, if the amplitude of the vibration system including the voice coil exceeds the expected range, the length of the tinsel wire may be insufficient for the amplitude, and the tinsel wire may become taut first when the diaphragm protrudes. At this time, the tension of the tinsel wire pulls on the voice coil, causing it to tilt, which can cause friction between the voice coil and the magnetic circuit, potentially leading to wire breakage or destruction. It is necessary to suppress the occurrence of voice coil wire breakage due to the tension of the tinsel wire during excessive input. In this embodiment, a contractible elastic member is placed around the tinsel wire connecting the terminal board and the voice coil. When the tinsel wire becomes taut, the elastic member contracts, virtually stretching the tinsel wire. On the other hand, when the tinsel wire is not taut, it is positioned in the normal position, and during the downward stroke, the tinsel wire reaches the set length.

[0011] Figure 1 is a cross-sectional view showing the structure of a speaker 100 used for comparison in this embodiment. The speaker 100 includes a frame 10, a diaphragm 20, an edge 22, a terminal board 30, a voice coil bobbin 40, a voice coil 42, a magnetic circuit 44, a damper 46, and a wire 50.

[0012] The frame 10 has a bowl-shaped form and an opening 12 in its upper portion. The bottom portion of the frame 10 is also open, and a magnetic circuit 44 is attached to the bottom portion. The magnetic circuit 44 includes a magnet. The magnetic circuit 44 may also include a pot yoke and a top plate. In this embodiment, "upper side" refers to the direction of sound emission from the speaker 100, and "lower side" refers to the direction opposite to the direction of sound emission from the speaker 100. These directions are common throughout the following description.

[0013] The voice coil bobbin 40 is a cylindrical tube around which the voice coil 42 is wound. The voice coil 42 works in conjunction with the magnetic circuit 44 to vibrate the voice coil bobbin 40. Furthermore, a diaphragm 20 and a damper 46 are connected to the voice coil bobbin 40. The diaphragm 20 vibrates in sync with the voice coil bobbin 40. The voice coil 42 is held in the center of the magnetic gap by the damper 46, the diaphragm 20 and the edge 22, without touching the magnetic circuit 44 that forms the magnetic gap. The magnetic gap is a magnetic concentration point that generates a driving force when current flows through the voice coil 42, and the voice coil 42 is positioned in this gap.

[0014] The diaphragm 20 is joined to the voice coil bobbin 40 within the opening 12 of the frame 10. The diaphragm 20 vibrates in conjunction with the voice coil bobbin 40 and the voice coil 42, causing the air to vibrate and releasing sound as sound waves into the air. The edge 22 has an annular shape, with its inner circumference joined to the outer circumference of the diaphragm 20 and its outer circumference joined to the frame 10. The edge 22 has the flexibility to allow the diaphragm 20 to oscillate along its central axis. The edge 22 is made of, for example, rubber. The diaphragm 20 and the voice coil 42 may be combined into a vibrating unit.

[0015] The terminal board 30 is mounted on the frame 10, and wiring between it and an amplifier (not shown) is connected to it. A tin wire 50 is also connected to the terminal board 30, and the tin wire 50 connects the terminal board 30 to the voice coil 42. As a result, the audio signal from the amplifier flows through the terminal board 30 and the tin wire 50 to the voice coil 42.

[0016] Figures 2(a) and 2(b) are cross-sectional perspective views showing the structure of the speaker 100 during lower stroke and upper stroke. Figure 2(a) shows the structure of the speaker 100 during normal input and lower stroke. Normal input refers to the case where a current within a predetermined current range that the speaker 100 can tolerate is input to the voice coil 42 via the tinsel wire 50. Lower stroke refers to the case where the voice coil 42, which is movable in the vertical direction, is moving downward. In this situation, the magnetic circuit 44 is designed to be in a position that does not contact the lowest end of the voice coil 42. The tinsel wire 50 is also designed to be of a length that does not contact the diaphragm 20 and damper 46 during vertical amplitude.

[0017] Figure 2(b) shows the structure of speaker 100 during excessive input and upper stroke. Excessive input refers to the case where an excessive current exceeding a predetermined current range is input to the voice coil 42 via the tinsel wire 50. Upper stroke refers to the case where the voice coil 42, which is movable in the vertical direction, is moving upward. In this situation, the voice coil 42 has moved upward beyond the expected amplitude range, and as a result, the tinsel wire 50 may become taut first. When the tinsel wire 50 becomes taut, the upper part of the voice coil 42 to which the tinsel wire 50 is connected is pulled towards the terminal plate 30, and if the voice coil 42 tilts within the magnetic gap, the voice coil 42 cannot be properly positioned in the center of the magnetic gap and will vibrate while contacting the magnetic circuits 44 on both sides of the magnetic gap, damaging the voice coil 42 and the magnetic circuits 44. Furthermore, repeated vibration in a taut state may cause the tinsel wire 50 to break or become damaged.

[0018] FIG. 3 is a cross-sectional view showing the structure of the speaker 200 according to this embodiment when there is no input. The speaker 200 includes a frame 210, a diaphragm 220, an edge 222, a terminal board 230, a voice coil bobbin 240, a voice coil 242, a magnetic circuit 244, a damper 246, and a silk thread 250. The frame 210, the opening 212, the diaphragm 220, the edge 222, the voice coil bobbin 240, the voice coil 242, the magnetic circuit 244, and the damper 246 are the same as the frame 10, the opening 12, the diaphragm 20, the edge 22, the voice coil bobbin 40, the voice coil 42, the magnetic circuit 44, and the damper 46, so the description thereof is omitted here.

[0019] FIG. 4 is a partial perspective view showing the structure of the speaker 200 when there is no input. This is an enlarged view of the periphery of the terminal board 230 in FIG. 3. The terminal board 230 is provided on the frame 210. A silk thread 250 is connected to the connection terminal 232 on the terminal board 230. The silk thread 250 passes through a through hole 224 provided in the diaphragm 220 and is also connected to a voice coil 242 (not shown). An elastic member 260, for example, in a semi-cylindrical shape, is provided adjacent to the connection terminal 232 on the terminal board 230. The shape of the elastic member 260 is not limited and may be cylindrical, square-columnar, or spherical. Also, the position where the elastic member 260 is disposed is around the silk thread 250 connecting the terminal board 230 and the voice coil 242, within the range where the silk thread 250 is displaced when the voice coil 242 moves upward beyond the assumed amplitude range. The flat portion of the elastic member 260 is connected to the terminal board 230, and the arc portion of the elastic member 260 faces away from the terminal board 230. The silk thread 250 connected to the connection terminal 232 meanders along the arc portion of the elastic member 260 and then reaches the through hole 224. This meandering shortens the substantial length of the silk thread 250. The elastic member 260 is preferably installed at a position where it does not contact the silk thread 250 when a current within a predetermined current range is input to the voice coil 242 through the silk thread 250, that is, when the amplitude amount of the vibration system including the voice coil bobbin 240 and the voice coil 242 is within the assumed range and the styling of the silk thread 250 is maintained. Also, the elastic member 260 is formed of a material having elasticity such as resin.

[0020] Figure 5 is a cross-sectional view showing the structure of the speaker 200 during its upper stroke when an excessive current exceeding a predetermined current range is input to the voice coil 242 via the brocade wire 250. Figure 6 is a partial perspective view showing the structure of the speaker 200 during its upper stroke. During the upper stroke, the voice coil 242 moves upward. When an excessive current exceeding a predetermined current range is input to the voice coil 242 via the brocade wire 250, the voice coil 242 moves upward with a larger amplitude than when a current within the predetermined current range is input. As a result of the movement of the voice coil 242, an upward force is applied to the brocade wire 250 due to tension. In this embodiment, this force is called the moving stress. At that time, as shown in Figure 6, the brocade wire 250 comes into contact with the elastic member 260, and the elastic member 260 is crushed by the moving stress of the brocade wire 250 and deformed so that its diameter is shortened. As a result, the tension on the brocade wire 250 is alleviated by the substantially increased length of the brocade wire 250. The elastic member 260 is positioned so as to be crushed by the moving stress generated in the brocade wire 250 in response to the vibration of the voice coil 242 when an excessive current exceeding a predetermined current range is input to the voice coil 242 via the brocade wire 250 and the voice coil 242 moves in the sound emission direction. In other words, the elastic member 260 is positioned and positioned in a direction such that it is crushed by the brocade wire 250 when the voice coil 242 moves beyond the expected amplitude in the sound emission direction.

[0021] An excessive current exceeding a predetermined current range is input to the voice coil 242 via the brocade thread 250, and the case where the voice coil 242 moves in the direction opposite to the sound emission direction, that is, moves downward, will be described. At this time, since the damper 246 abuts on the magnetic circuit 244 and the stroke is restricted, it is not necessary to relieve the tension of the brocade thread 250 by deforming the elastic member 260. That is, the position where the elastic member 260 is disposed may be any position where it deforms when an excessive current exceeding a predetermined current range is input to the voice coil 242 via the brocade thread 250 and the voice coil 242 moves in the sound emission direction.

[0022] According to the present embodiment, since the elastic member 260 deforms due to the moving stress generated in the brocade thread 250 in response to the vibration of the voice coil 242, the substantial length of the brocade thread 250 can be increased. Further, since the substantial length of the brocade thread 250 is increased, the stress applied to the voice coil 242 can be relieved. Further, by relieving the stress applied to the voice coil 242, it is possible to suppress the voice coil from being pulled and tilted, and to suppress the breakage of the voice coil 242. Further, since the breakage of the voice coil 242 is suppressed, it is possible to suppress the breakage of the speaker 200 even when an excessive current exceeding the maximum input is input.

[0023] Further, when an excessive current exceeding a predetermined current range is input to the voice coil 242 via the brocade thread 250 and the voice coil 242 moves in the sound emission direction, the elastic member 260 is installed at a position where it deforms due to the moving stress generated in the brocade thread 250 in response to the vibration of the voice coil 242, so that the elastic member 260 can be deformed. Further, when a current within a predetermined current range is input to the voice coil 242 via the brocade thread 250, the elastic member 260 is installed at a position where it does not contact the brocade thread 250, so that the elastic member 260 can be prevented from being deformed. Further, since the elastic member 260 does not deform, the appropriate designed length of the brocade thread 250 can be maintained.

[0024] The present invention has been described above based on examples. These examples are illustrative, and it will be understood by those skilled in the art that various modifications are possible in combinations of their components and processing processes, and that such modifications also fall within the scope of the present invention. [Explanation of Symbols]

[0025] 200 Speaker, 210 Frame, 212 Aperture, 220 Diaphragm, 222 Edge, 224 Through-hole, 230 Terminal board, 232 Connection terminal, 240 Voice coil bobbin, 242 Voice coil, 244 Magnetic circuit, 246 Damper, 250 Wire strip, 260 Elastic member.

Claims

1. Terminal board and A vibrating section including a voice coil and a diaphragm, A brocade wire connecting the terminal board and the voice coil, The system comprises an elastic member arranged around the aforementioned silk thread, The elastic member deforms due to the moving stress generated in the silk thread in response to the vibration of the vibrating part. Speaker.

2. The speaker according to claim 1, wherein the elastic member is installed in a position where it deforms due to the moving stress generated in the tin wire in response to the vibration of the vibrating part when an excessive current exceeding a predetermined current range is input to the voice coil via the tin wire.

3. The speaker according to claim 1, wherein the elastic member is installed in a position where it deforms due to the moving stress generated in the tin wire in response to the vibration of the vibrating part when an excessive current exceeding a predetermined current range is input to the voice coil via the tin wire and the vibrating part moves in the sound emission direction.

4. The speaker according to any one of claims 1 to 3, wherein the elastic member is installed in a position that does not come into contact with the brocade wire when a current within a predetermined current range is input to the voice coil via the brocade wire.

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