JP6274285B1 - Horn sound source device and horn equipped with the same - Google Patents

Horn sound source device and horn equipped with the same Download PDF

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JP6274285B1
JP6274285B1 JP2016193025A JP2016193025A JP6274285B1 JP 6274285 B1 JP6274285 B1 JP 6274285B1 JP 2016193025 A JP2016193025 A JP 2016193025A JP 2016193025 A JP2016193025 A JP 2016193025A JP 6274285 B1 JP6274285 B1 JP 6274285B1
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center
iron core
eccentric
movable iron
gravity
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JP2018054983A (en
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寿信 井野
寿信 井野
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マツダ株式会社
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Abstract

An object of the present invention is to provide a sound source device for a horn that outputs chords from one diaphragm. A sound source device for a horn mounted on a vehicle. The sound source device 10 includes a diaphragm 11, a movable core 12 including a support 121 connected to the diaphragm 11 via a fulcrum 121a, a first signal component having a first frequency that resonates with the diaphragm 11, and a movable core. And a coil that drives the movable iron core 12 by inputting a drive signal including a second signal component of a second frequency that resonates with the first frequency and has a chordal relationship with the first frequency. The fulcrum 121 a is provided at a position eccentric from the center of the diaphragm 11. The movable iron core 12 has a center of gravity eccentric part 122 connected to the support part 121 and having a center of gravity shifted in the eccentric direction of the fulcrum 121a from the fulcrum 121a. [Selection] Figure 1

Description

  The present invention relates to a sound source device for a horn mounted on a vehicle, and a horn provided with the same.
  A vehicle is equipped with a horn that vibrates a diaphragm with a movable iron core and outputs sound generated by the diaphragm to the outside through a resonance tube. Here, the reason why the resonance tube is provided is that if the sound generated by the diaphragm is output as it is, sufficient sound pressure required for the horn cannot be obtained. Since the resonance tube has a spiral shape, there is a problem that it cannot be removed if foreign matter such as water enters and accumulates in the resonance tube. Therefore, Patent Document 1 discloses a vehicular electric horn in which a foreign object intrusion preventing member for preventing the invasion of a foreign object is attached to the sound wave outlet opening of the resonance tube, and foreign objects flying from the front of the vehicle are prevented from entering the resonance tube. Is disclosed.
JP 2011-76018 A
  By the way, if the sound output from the horn is made into a chord, it is considered that a comfortable sound is output for the occupant, and driving pleasure is increased. As a technique for realizing the output of a chord, for example, a technique of providing a plurality of horns that output sounds having different frequencies can be considered.
  However, since there are a plurality of horns in this method, there is a problem that cost and weight increase. Moreover, since the installation space of a horn in a vehicle is limited, it is not preferable to provide a plurality of horns.
  Moreover, since patent document 1 is an invention which prevents the penetration | invasion of a foreign material, it cannot output a chord using one horn.
  An object of the present invention is to provide a sound source device for a horn that outputs chords from one diaphragm.
  A sound source device for a horn according to the present invention is mounted on a vehicle, and includes a diaphragm, a movable iron core connected to the diaphragm via a fulcrum, a first signal component having a first frequency that resonates with the diaphragm, A drive signal including a second signal component of a second frequency that resonates with the movable iron core and has a chordal relationship with the first frequency, and a coil that drives the movable iron core. The fulcrum is provided at a position eccentric from the center of the diaphragm. The movable iron core includes a support part connected to the diaphragm via the fulcrum, and a center of gravity eccentric part connected to the support part and having a center of gravity shifted in an eccentric direction of the fulcrum from the fulcrum. .
  According to this configuration, the diaphragm resonates with the first frequency, and the first sound is output. The movable iron core resonates at the second frequency and vibrates so that the center of gravity swings around the fulcrum. Here, since the fulcrum is eccentric from the center of the diaphragm, in the diaphragm, the amplitude of the region on the eccentric direction side (first region) with respect to the fulcrum is a region opposite to the eccentric direction with respect to the fulcrum (first region). It becomes larger than the amplitude of the second region). As a result, in the diaphragm, the vibrations of the second frequency in the first region and the second region become asymmetric and do not cancel each other, and the second sound is output.
  However, this alone cannot provide a second sound with a sufficient sound pressure because the area of the first region is small. So, according to this structure, the said movable iron core has a gravity center eccentric part which is connected to the said support part and the gravity center has shifted | deviated to the eccentric direction of the said fulcrum rather than the said fulcrum. Therefore, the force with which the movable iron core pulls the second region at the time of swinging increases, the amplitude of the vibration of the second frequency in the second region increases, and a second sound having a sufficient sound pressure can be output. Furthermore, the first frequency and the second frequency have a chordal relationship. Therefore, a chord including the first and second sounds is output from one diaphragm.
  The said structure WHEREIN: The said movable iron core may be arrange | positioned inclining with respect to the orthogonal direction of the said diaphragm.
  According to this configuration, since the movable iron core is inclined, a vibration of a lateral component is applied to the diaphragm in addition to a vibration of a vertical component from the movable iron core. Therefore, the sound pressure of the second sound can be further increased.
  The said structure WHEREIN: The said gravity center eccentric part may be formed so that it may become large toward the said eccentric direction.
  According to this configuration, the center-of-gravity eccentric portion is formed so as to increase in the eccentric direction, so that the center-of-gravity position of the center-of-gravity eccentric portion is a position offset in the eccentric direction. Therefore, the center of gravity of the movable iron core is shifted in the eccentric direction from the fulcrum.
  The said structure WHEREIN: You may provide the bobbin by which the said coil is wound. The movable iron core may have an insertion part that is connected to the eccentric part of the center of gravity and is inserted into the bobbin. The center of gravity of the center-of-gravity eccentric part may be positioned closer to the insertion part than the center of gravity of the movable iron core.
  According to this configuration, the center of gravity of the center-of-gravity eccentric portion is located closer to the insertion portion than the center of gravity of the movable core, so that the center of gravity of the movable core is close to the insertion portion. Therefore, the distance from the said fulcrum of the said gravity center of the said movable iron core becomes long. Here, the swinging motion of the movable iron core is considered to be the swinging motion of the pendulum at the center of gravity of the movable core. Therefore, when the distance from the fulcrum of the center of gravity of the movable iron core is increased, the cycle of the swinging motion of the movable iron core is increased, and the second frequency that resonates with the movable iron core is decreased. Accordingly, the difference in pitch between the first sound and the second sound generated from the diaphragm is increased.
  The said structure WHEREIN: The said gravity center eccentric part may be formed so that it may become large toward the said insertion part.
  According to this configuration, the center-of-gravity eccentric portion is formed so as to increase toward the insertion portion, and therefore the center-of-gravity position of the center-of-gravity eccentric portion is a position that is biased toward the insertion portion. Therefore, the position of the center of gravity of the movable core is close to the insertion portion, and the distance from the fulcrum of the center of gravity of the movable core is increased. As a result, the second frequency that resonates with the movable iron core decreases, and the difference in pitch between the first sound and the second sound generated from the diaphragm increases.
  The said structure WHEREIN: The said penetration part may be shorter than at least one among the said support part and the said gravity center eccentric part.
  Here, since the movable iron core resonates at the second frequency and vibrates so that the center of gravity swings around the fulcrum, there is a problem that the insertion portion easily comes into contact with the bobbin. However, according to the above configuration, since the insertion part is shorter than at least one of the support part and the eccentric center part, the area of the insertion part facing the bobbin becomes small. Therefore, it becomes difficult for the insertion portion to contact the bobbin.
  The said structure WHEREIN: You may provide the bobbin by which the said coil is wound. The bobbin may have a facing surface that faces the movable iron core. The movable iron core may have a facing surface that faces the bobbin. A gap extending in the axial direction of the bobbin may be formed between the facing surface of the movable iron core and the facing surface of the bobbin.
  According to this configuration, since the gap extending in the axial direction of the bobbin is formed between the facing surface of the movable core and the facing surface of the bobbin, the movable core is moved when the movable core is vibrated. Contact with the bobbin is prevented.
  The horn according to the present invention includes the sound source device, a first sound having a fundamental frequency of the first frequency, and a second sound having a fundamental frequency of a second frequency having a chordal relationship with the first frequency. A chord is input from the sound source device, and a resonance tube that resonates the first sound and the second sound is provided.
  According to this configuration, since the horn includes the sound source device and the resonance tube, a chord can be output using one horn.
  The sound source device according to the present invention can output chords from one diaphragm.
It is an internal block diagram of a horn provided with the sound source device which concerns on embodiment of this invention. It is an external appearance block diagram of the sound source device which concerns on embodiment of this invention. It is a perspective view of the movable iron core of the sound source device according to the embodiment of the present invention. It is a front view of the movable iron core of the sound source device according to the embodiment of the present invention. It is an external view of the resonance tube of the horn which concerns on embodiment of this invention. It is the figure which compared the sound source device of this Embodiment, and the sound source device of a comparative example. It is the figure which showed the relationship between the length of the gravity center of a movable iron core, a fulcrum, and resonance. It is a figure explaining the effect | action at the time of decentering a fulcrum from the center of a diaphragm. It is the figure which showed sound pressure distribution according to the shape of a movable iron core. FIG. 10 is a close-up view of the movable iron core shown in section (a) of FIG. 9. FIG. 10 is a close-up view of the movable iron core shown in section (b) of FIG. 9. It is the figure which compared the sound pressure distribution of the 2nd vibration by the difference in the inclination direction of a movable iron core. It is an internal block diagram of a horn provided with the sound source device which concerns on the modification of this invention.
  FIG. 1 is an internal configuration diagram of a horn 1 including an exemplary sound source device 10. FIG. 2 is an external configuration diagram of the exemplary sound source device 10. Hereinafter, the horn 1 will be described with reference to FIGS. 1 and 2, the upper direction with respect to the paper surface is referred to as the upper direction, the lower direction is referred to as the lower direction, and the direction in which the upper and lower directions are collectively referred to as the up and down direction. Further, the left direction is referred to as the left direction, the right direction is referred to as the right direction, and the left direction and the right direction are collectively referred to as the left and right direction with respect to the page. Furthermore, the vertical direction and the direction orthogonal to the horizontal direction are referred to as the front-rear direction, the direction toward the front in the front-rear direction is referred to as the front, and the direction toward the back is referred to as the rear.
  The horn 1 includes a sound source device 10 that generates sound and a resonance tube 20 that is provided above the sound source device 10 and resonates with sound output from the sound source device 10.
  The sound source device 10 includes a diaphragm 11, a movable iron core 12 connected to the diaphragm 11 via a fulcrum region 1211, a fixed iron core 13 provided below the movable iron core 12, and a winding 15 constituting a coil. A bobbin 14 around which the winding wire 15 is wound. Furthermore, the sound source device 10 includes a case 16 that houses the movable iron core 12, the fixed iron core 13, the bobbin 14, and the winding wire 15, an outer frame 17 that attaches the outer edge of the diaphragm 11 to the outer edge of the case 16, and a bottom surface of the case 16. And a bracket 30 attached to the lower side of the bracket.
  With reference to FIG. 2, the diaphragm 11 is made of, for example, a flexible disk-shaped metal, vibrates due to the vibration of the movable iron core 12, and outputs a sound. The diaphragm 11 is mounted on a circular edge provided on the uppermost side of the case 16 and is fixed to the case 16 by being caulked by the outer frame 17. Referring to FIG. 1, the diaphragm 11 is provided with a taper 11 a having a slope in which a certain region surrounding the support portion 121 of the movable iron core 12 is inclined conically downward and is easily vibrated.
  FIG. 3 is a perspective view of the movable iron core 12 of the exemplary sound source device 10. FIG. 4 is a front view of the movable iron core 12 of the exemplary sound source device 10. Hereinafter, the movable iron core 12 will be described with reference to FIGS. The up-down direction, left-right direction, and front-rear direction in FIGS. 3 and 4 correspond to FIGS. The movable iron core 12 is made of a magnetic material, and includes a support part 121 connected to the diaphragm 11 via a fulcrum region 1211, a gravity center eccentric part 122 connected to the lower side of the support part 121, and a gravity center eccentric part 122. An insertion portion 123 connected to the lower side and inserted through the bobbin 14.
  The support portion 121 has a columnar shape, and sandwiches the fulcrum region 1211 from both sides in the vertical direction. As shown in FIGS. 1 and 4, the support portion 121 is provided at a position where the center of the fulcrum region 1211 (hereinafter referred to as “fulcrum 121 a”) is eccentric to the right from the center O of the diaphragm 11. Yes. Here, the direction in which the fulcrum 121a is eccentric (here, the right side) is described as the eccentric direction D1.
  As shown in FIGS. 3 and 4, the center-of-gravity eccentric portion 122 is formed in a substantially convex shape that protrudes upward. As shown in FIGS. 1 and 3, the center-of-gravity eccentric portion 122 protrudes from the support portion 121 in the right direction, that is, the eccentric direction D1. Thereby, the gravity center G1 of the gravity center eccentric part 122 is shifted in the eccentric direction D1 of the fulcrum 121a from the fulcrum 121a. Therefore, the upper surface 1221 u of the center-of-gravity eccentric part 122 is exposed from the support part 121. The center of gravity G of the movable iron core 12 is shifted in the eccentric direction D1 from the fulcrum 121a by shifting the center of gravity G1 of the center of gravity eccentric portion 122 in the eccentric direction D1. The center-of-gravity eccentric part 122 includes a first connection part 122 a connected to the support part 121 and a second connection part 122 b connected to the insertion part 123.
  As shown in FIGS. 1 and 3, the first connection portion 122 a is formed in a rectangular parallelepiped shape whose length in the vertical direction is shorter than the length in the left-right direction and the front-back direction. The length in the front-rear direction of the first connection part 122a is equal to the diameter of the support part 121 as shown in FIG. The length of the first connecting portion 122a in the left-right direction is slightly shorter than the diameter of the support portion 121, as shown in FIG. The length of the first connecting portion 122a in the vertical direction is shorter than the length of the support portion 121 in the vertical direction.
  As shown in FIGS. 1 and 3, the second connection portion 122 b is formed in a right triangular prism shape extending in the front-rear direction. The length in the front-rear direction of the second connection part 122b is longer than the length in the front-rear direction of the first connection part 122a. Thereby, the gravity center eccentric part 122 is formed so as to increase toward the insertion part 123. As a result, as shown in FIG. 4, the center of gravity G1 of the center-of-gravity eccentric portion 122 is shifted to the insertion portion 123 side, and is located closer to the insertion portion 123 than the center of gravity G of the movable core 12. Therefore, the position of the center of gravity G of the movable iron core 12 is close to the insertion portion 123, and the distance from the fulcrum 121a of the center of gravity G of the movable iron core 12 is increased. As shown in FIGS. 1 and 3, the second connection portion 122 b has an inclined surface 122 ba formed so that the length in the vertical direction gradually increases in the right direction, that is, in the eccentric direction D <b> 1. Thereby, the gravity center G1 of the gravity center eccentric part 122 is largely shifted in the eccentric direction D1 from the fulcrum 121a. As a result, the center of gravity G of the movable iron core 12 is largely shifted in the eccentric direction D1 from the fulcrum 121a.
  As shown in FIGS. 3 and 4, the insertion portion 123 is formed in a cylindrical shape. The insertion part 123 is connected to the inclined surface 122ba of the second connection part 122b. The central axis C2 of the insertion part 123 is inclined obliquely downward and leftward with respect to the vertical direction. Thereby, the gravity center G of the movable iron core 12 is shifted in the eccentric direction D1 from the fulcrum 121a. As shown in FIG. 1, the length of the insertion portion 123 in the direction in which the central axis C <b> 2 extends is longer than the length in the direction in which the central axis C <b> 1 extends in the support portion 121 and the length in the direction in which the central axis C <b> 1 extends. Is also shorter. The length of the insertion portion 123 in the direction in which the central axis C2 extends is at least one of the length in the direction in which the central axis C1 of the support portion 121 extends and the length in the direction in which the central axis C1 of the center of gravity eccentric portion 122 extends. Shorter is enough.
  The fixed iron core 13 is formed in a columnar shape. The fixed iron core 13 is fitted into a hole provided on the bottom surface of the case 16. Thereby, the fixed iron core 13 is fixed inside the case 16.
  The bobbin 14 is composed of a drum-shaped member around which the winding wire 15 is wound. The bobbin 14 has a pair of flange portions protruding from both ends in the outer diameter direction. One of the pair of flange portions is a facing surface 14 a that faces the movable iron core 12. The bobbin 14 is inserted into the hole 141 from above by the insertion part 123 of the movable iron core 12. The diameter of the hole 141 is slightly larger than the diameter of the insertion part 123. Thereby, in addition to the vibration along the central axis C2, the movable iron core 12 can swing around the fulcrum 121a. A signal generator (not shown) is connected to the winding 15, and a first signal component having a first frequency that resonates with the diaphragm 11 and a second signal component having a second frequency that resonates with the movable iron core 12. Including a driving signal.
  As shown in FIGS. 1 and 2, the case 16 includes a conical cylindrical upper portion 161 and a substantially cylindrical lower portion 162 provided below the upper portion 161. The upper portion 161 includes a placement portion 161a on which the outer edge of the diaphragm 11 is placed, and a reduced diameter portion 161b whose diameter gradually decreases downward from the placement portion 161a. The reduced diameter portion 161b is formed such that the center in the inner diameter direction gradually shifts in the eccentric direction D1 from the center O of the diaphragm 11 downward. The lower portion 162 is connected to the lower end of the reduced diameter portion 161b, and includes a cylindrical portion 162a that extends parallel to the central axis C1 of the fulcrum 121a and a conical portion 162b that extends parallel to the central axis C2. The length of the cylindrical portion 162a in the direction in which the central axis C1 extends is shorter than the length in the direction in which the central axis C2 of the conical portion 162b extends. The bottom surface of the case 16 is perpendicular to the central axis C2. The case 16 is disposed at a position shifted from the center O of the diaphragm 11 in the eccentric direction D1 with respect to the diaphragm 11 as a whole.
  The bracket 30 is formed in a substantially L shape, and includes a contact surface 30a that contacts the bottom surface of the case 16 and a hole 30c that extends rightward from the bottom surface of the case 16 and attaches the horn 1 to the inside of the vehicle. Mounting portion 30b.
  FIG. 5 is an external view of the resonance tube 20 of the exemplary horn 1. As shown in FIGS. 1 and 5, the resonance tube 20 includes a main resonance tube 20a having an opening above the center O of the diaphragm 11, and a branch resonance tube 20b branched from the main resonance tube 20a. The main resonance tube 20a and the branch resonance tube 20b are spiral. A chord including the first sound and the second sound is input to the main resonance tube 20a. The main resonance tube 20a resonates with one of the first sound and the second sound, and outputs one sound from the opening 21. The branch resonance tube 20b resonates with one of the first sound and the second sound and outputs the other sound from the opening 22.
  The operation of the horn 1 shown in FIG. 1 will be briefly described. When a drive signal from a signal generator (not shown) is applied to the winding 15, the movable iron core 12 is driven by receiving an electromagnetic force from the winding 15. Here, since the first signal component included in the drive signal has a first frequency that resonates with the diaphragm 11, the diaphragm 11 vibrates in the vertical direction by the movable iron core 12, and the first frequency is set as a fundamental frequency. A first sound is generated. Further, since the second signal component included in the drive signal has a second frequency that resonates with the movable core 12, the movable core 12 swings around the fulcrum 121a. Thereby, the diaphragm 11 generates a second sound having the second frequency as a fundamental frequency.
  Here, according to the horn 1 described above, the movable iron core 12 resonates at the second frequency and vibrates so that the center of gravity G swings around the fulcrum 121a, so that the insertion portion 123 contacts the bobbin 14. There is a possibility. As shown in FIG. 1, the length of the insertion portion 123 in the direction in which the central axis C <b> 2 extends is longer than the length in the direction in which the central axis C <b> 1 extends in the support portion 121 and the length in the direction in which the central axis C <b> 1 extends. Is also shorter. Therefore, the area of the insertion portion 123 facing the bobbin 14 in the radial direction is small, and the insertion portion 123 is unlikely to contact the bobbin 14.
  As the first frequency and the second frequency, an incomplete consonant may be employed, or a complete consonant may be employed. Here, as the first and second sounds, incomplete consonants having a frequency ratio of 1.25 are employed, but the present invention is not limited to this.
  FIG. 6 is a diagram comparing the sound source device 10 of the present embodiment and the sound source device 10J of the comparative example. In the graph of FIG. 6, a characteristic G51 indicates the frequency characteristic of the sound source device 10, and a characteristic G52 indicates the frequency characteristic of the sound source device 10J of the comparative example. In the graph of FIG. 6, the vertical axis represents sound pressure and the horizontal axis represents frequency.
  In the sound source device 10J, the movable iron core 12J is attached to the center of the diaphragm 11J. Therefore, the characteristic G52 has only one resonance frequency observed in the vicinity of 500 Hz. On the other hand, in the sound source device 10, the movable iron core 12 is eccentrically attached to the diaphragm 11 from the center O of the diaphragm 11, and the center of gravity G of the movable iron core 12 is shifted in the eccentric direction D1. Therefore, the characteristic G51 has a resonance frequency due to resonance of the diaphragm 11 observed near 500 Hz and a resonance frequency due to resonance of the movable iron core 12 observed near 400 Hz. Accordingly, the diaphragm 11 generates a chord having a second sound (A sound) due to the resonance of the movable iron core 12 in addition to the first sound (B sound) due to the resonance of the diaphragm 11.
  FIG. 7 is a view showing the relationship between the length L of the center of gravity G of the movable core 12 and the fulcrum 121a and the resonance. The section (a) shown in the first line shows the case where the length L is L1, the section (b) shown in the second line shows the case where the length L is 0, and the section shown in the third line (C) shows a case where the length L is 2 · L1. Further, in the sections (a) to (c), the circle shown in the center indicates the sound pressure distributions 611, 612, 621, 622, 631, and 632 of vibrations generated in the diaphragm 11. In the sound pressure distributions 611, 612, 621, 622, 631, and 632, the sound pressure decreases as the distance from the center of the concentric circles increases. The sound pressure distributions 611, 621, 631 indicate the sound pressure distribution of vibrations (hereinafter referred to as “first vibration”) generated in the diaphragm 11 due to resonance of the diaphragm 11. The sound pressure distributions 612, 622, and 632 indicate the sound pressure distribution of vibrations (hereinafter referred to as “second vibration”) generated in the diaphragm 11 due to resonance of the movable iron core 12.
  The frame 651 is a diagram showing the swinging motion of the movable iron core 12. In the example of the frame 651, the center diagram shows a state S1 (neutral state) in which the movable iron core 12 faces in the up-and-down direction, and the left diagram shows a state S2 in which the movable iron core 12 swings most rightward. The diagram on the right side shows a state S3 in which the movable iron core 12 is swung to the left. As shown in states S1 to S3, it can be seen that the movable iron core 12 is oscillating symmetrically due to resonance.
  Specifically, as the diaphragm 11 moves from the state S1 to the state S2, the downward deflection in the region on the left side of the fulcrum 121a increases, and the upward deflection in the region on the right side of the fulcrum 121a increases. It will increase. Further, as the state moves from the state S1 to the state S3, the vibration of the diaphragm 11 increases in the region on the left side of the fulcrum 121a and increases in the downward direction in the region on the right side of the fulcrum 121a. To go. Thereby, as shown in the sound pressure distributions 612 and 632, the second vibration has a sound pressure distribution having two peaks symmetrically with respect to the line L6 in the front-rear direction passing through the fulcrum 121a.
  Since the movable iron core 12 oscillates in the left-right direction around the fulcrum 121a, the oscillating motion of the movable iron core 12 can be considered as the oscillating motion of the pendulum with the center of gravity G around the fulcrum 121a. This is shown in the three figures shown in the left column of FIG.
  In the example of section (a), the resonance frequency of the second vibration due to the swinging motion of the pendulum having the length L = L1 was 255 Hz as shown in the sound pressure distribution 612. On the other hand, in the example of section (c), since the length is twice that of section (a), the resonance frequency of the second vibration is 1/2 the resonance frequency of section (a) as shown in sound pressure distribution 632. (= 128 Hz). In the example of section (b), the center of gravity G coincides with the fulcrum 121a, and the movable iron core 12 does not oscillate. Therefore, as shown in the sound pressure distribution 622, the second vibration does not occur.
  As described above, the swinging motion of the movable iron core 12 is considered to be the swinging motion of the pendulum having the center of gravity G. Therefore, when the length L is increased, the resonance frequency of the second vibration generated in the diaphragm 11 by the swinging motion is lowered. I understand that
  On the other hand, since the first vibration is due to the resonance of the diaphragm 11 and does not depend on the swinging motion of the movable iron core 12, the same resonance frequency of 227 Hz is obtained in the sections (a) to (c).
  Thus, the second vibration can be generated in the diaphragm 11 by providing the center of gravity G below the fulcrum 121a. However, when the center of gravity G is provided directly below the fulcrum 121a, as shown in the states S2 and S3, the second vibration generates amplitude symmetrically with respect to the fulcrum 121a. Therefore, as shown in the schematic diagram 640, the positive vibration and the negative amplitude cancel each other in the second vibration, and the sound due to the second vibration, that is, the second sound is not generated from the diaphragm 11.
  Therefore, the sound source device 10 has the fulcrum 121a eccentric from the center O of the diaphragm 11 in the eccentric direction D1, as shown in FIG. FIG. 8 is a view for explaining the operation when the fulcrum 121a is eccentric from the center O of the diaphragm 11. Section (a) shows the state of the second vibration when the fulcrum 121a is eccentric from the center O of the diaphragm 11. FIG. In the example of section (a), the fulcrum 121a is shifted from the center O in the eccentric direction D1 (here, to the left). In this case, as shown in the schematic diagram 730 and the sound pressure distribution 711, the amplitude of the second vibration is larger on the left side than the right side with respect to the fulcrum 121a. The second sound is generated from the diaphragm 11. However, since the sound pressure of the second sound is determined by the vibration area × amplitude, the diaphragm 11 vibrates greatly only in a small area on the left side of the fulcrum 121a, and the second sound with sufficient sound pressure can be obtained. .
  Therefore, the sound source device 10 shifts the center of gravity G of the movable iron core 12 toward the eccentric direction D1. Section (b) of FIG. 8 is a diagram showing the relationship between the eccentric patterns M1, M2, M3 of the center of gravity G of the movable iron core 12 and the sound pressure distributions 721, 722, 723. The eccentric pattern M1 is a pattern in which the center of gravity G is shifted in the eccentric direction D1 with respect to the fulcrum 121a, and is the configuration of the present embodiment. The eccentric pattern M2 is a pattern in which the center of gravity G is arranged directly below the fulcrum 121a, and is the same pattern as the section (a). The eccentric pattern M3 is a pattern in which the center of gravity G is shifted in a direction opposite to the eccentric direction D1 with respect to the fulcrum 121a.
  The sound pressure distribution 722 in the eccentric pattern M2 is the same as the sound pressure distribution 711 in the section (a). In the eccentric pattern M3, as shown in the sound pressure distribution 721, in the region on the left side of the line L7 in the front-rear direction passing through the fulcrum 121a, the diaphragm 11 vibrates greatly as in the eccentric pattern M2. In the region on the right side of L7, the vibration of the diaphragm 11 is smaller than the eccentric pattern M2. Therefore, in the eccentric patterns M2 and M3, the second sound having a sufficient sound pressure cannot be obtained.
  On the other hand, in the eccentric pattern M1, the center of gravity G is shifted to the eccentric direction D1 side. Therefore, when the movable iron core 12 is swung, the diaphragm 11 is greatly pulled by the movable iron core 12 in the region on the right side of the line L7. It is done. Thereby, in the region on the right side of the line L7, the vibration of the diaphragm 11 is larger than the eccentric pattern M2. Thereby, in the eccentric pattern M1, the 2nd sound of sufficient sound pressure is obtained.
  FIG. 9 is a view showing a sound pressure distribution according to the shape of the movable iron core 12. In both sections (a) and (b), the center of gravity G is shifted in the eccentric direction D1, but the shape of the movable iron core 12 is different. In the section (a), the shape of the movable iron core 12 is substantially the same as the shape shown in FIGS. 1 to 4, but the section (b) is different from the shape shown in FIGS. 1 to 4. In FIG. 8, the movable iron core 12 is in the neutral state and the longitudinal direction faces the orthogonal direction of the diaphragm 11. However, in FIG. 9, the movable iron core 12 is neutral in both sections (a) and (b). In the state, the longitudinal direction is inclined with respect to the orthogonal direction of the diaphragm 11.
  FIG. 10 is a close-up view of the movable iron core 12 shown in the section (a) of FIG. FIG. 11 is a close-up view of the movable iron core 12 shown in the section (b) of FIG. Hereinafter, the movable core 12 shown in FIG. 10 will be described as the movable core 12 of the first example, and the movable core 12 shown in FIG. 11 will be described as the movable core 12 of the second example.
  The movable core 12 of the first example is the same as the movable core 12 described above with reference to FIGS. Specifically, the movable core 12 of the first example is more eccentric than the fulcrum 121a because the center of gravity eccentric portion 122 protrudes from the support portion 121 in the right direction (left direction in FIG. 10), that is, in the eccentric direction D1. The center of gravity G is shifted in the direction D1.
  In the movable core 12 of the second example, the center of gravity G is shifted in the eccentric direction D1 by inclining the central axis C2 of the insertion portion 123 toward the eccentric direction D1. In the movable core 12 of the second example, the upper end of the gravity center eccentric portion 122 does not protrude in the eccentric direction D1, and the central axis C2 of the insertion portion 123 is inclined in the eccentric direction D1 with respect to the central axis C1. This is different from the movable iron core 12 of the first example. The movable core 12 of the second example is the same as the first example in that the center axis C1 is directed in the vertical direction and includes a support part 121 that passes through the fulcrum 121a.
  As shown in the first row of FIG. 9, in the movable core 12 of the first and second examples, a large second vibration (in this case, 400 Hz) is observed in a wide area on the right side of the line L7, which is almost the same. It can be seen that the sound pressure distribution is observed. Further, as shown in the second line of FIG. 9, the first and second examples of the movable iron core 12 have the first vibration (500 Hz in this case) observed in a wide area centered on the center O, which is almost the same. It can be seen that the sound pressure distribution is observed.
  As can be seen by comparing the sections (a) and (b) in FIG. 9, even if the shape of the movable iron core 12 is different, if the center of gravity G is shifted in the eccentric direction D1 from the fulcrum 121a, the sound pressure is high. First and second vibrations are obtained, and a first sound and a second sound can be generated.
  FIG. 12 is a diagram comparing the sound pressure distribution of the second vibration due to the difference in the inclination direction of the movable iron core 12. Section (a) shows the case where the movable iron core 12 is inclined toward the eccentric direction D1, and section (b) shows the case where the movable iron core 12 is inclined toward the side opposite to the eccentric direction D1. Hereinafter, the slope pattern of section (a) is referred to as a first slope pattern, and the slope pattern of section (b) is referred to as a second slope pattern. In FIG. 12, the second row shows a neutral state in both inclined patterns, and the third row shows a left maximum swing state in both inclined patterns. Further, in both the first and second inclined patterns, the center of gravity G is shifted in the eccentric direction D1 by employing the above-described movable iron core 12 of the first example.
  As can be seen by comparing the sound pressure distributions 1101 and 1102 in the sections (a) and (b), the sound pressure in the region on the right side of the line L7 is slightly higher than that in the second gradient pattern. The sound pressure in the region on the left side of the line L7 was slightly lower than that of the second inclined pattern. These differences are considered to be caused by a difference in the shift amount of the center of gravity G in the eccentric direction D1 with respect to the fulcrum 121a in the first and second inclined patterns. In any case, it can be seen that the second vibration having a sufficient sound pressure is obtained in total in both inclined patterns.
  However, as shown in the section (a), in the first inclined pattern, the movable iron core 12 is displaced toward the eccentric direction D1, so that the fixed iron core 13 (see FIG. 1), the winding 15 (see FIG. 1), etc. The drive member may protrude from the left end (right end in FIG. 1) of the diaphragm 11. On the other hand, as shown in the section (b), in the second inclined pattern, since the movable iron core 12 is shifted to the opposite side to the eccentric direction D1, the driving members such as the fixed iron core 13 and the winding wire 15 are Collected on the center O side. Therefore, the 2nd inclination pattern has the merit that sound source device 10 can be gathered up compactly.
  As shown by the first and second inclined patterns, when the movable iron core 12 is inclined, the component of the force in the left-right direction applied to the diaphragm 11 becomes larger than when the movable iron core 12 is directed vertically. Therefore, the force contributing to the second vibration is increased, and a larger second sound can be generated.
  According to the sound source device 10 described above, the diaphragm 11 resonates at the first frequency, and the first sound is output. Further, the fulcrum 121a is eccentric from the center O of the diaphragm 11, and the center of gravity G of the movable iron core 12 is shifted in the eccentric direction D1 from the fulcrum 121a by shifting the center of gravity G1 of the center of gravity eccentric part 122 in the eccentric direction D1. Has been. Therefore, the movable iron core 12 is swung by the second frequency, and the second sound having a sufficient sound pressure can be output from the diaphragm 11. Furthermore, the first frequency and the second frequency have a chordal relationship. Therefore, the sound source device 10 can output a chord including the first and second sounds.
<Supplement>
(1) In the example of FIG. 1, the movable iron core 12 is inclined, but the movable iron core 12 is not necessarily inclined. For example, as shown in the eccentric pattern M1 of FIG. 8, the movable iron core 12 may face the up-down direction when neutral. Even in this configuration, as described in the sound pressure distribution 723 in FIG. 8, the second vibration having a sufficient sound pressure can be obtained.
  (2) The diameter of the diaphragm 11 may be designed to have a length that resonates with the target first frequency. The movable core 12 may be designed to have a full length and a shape so that the length L between the fulcrum 121a and the center of gravity G is a length that resonates with the target second frequency.
  FIG. 13 is an internal configuration diagram of the horn 111 including the sound source device 10 according to a modification of the present invention. The modified horn 111 is different from the horn 1 described above in the arrangement relationship between the movable iron core 12 and the bobbin 14. Since the horn 111 of the modified example has the same configuration as the horn 1 in other points, the same reference numerals as those of the horn 1 are given and description thereof is omitted.
  In the horn 1, the insertion portion 123 of the movable iron core 12 is inserted into the bobbin 14. However, in the modified horn 111, the movable iron core 12 is not inserted into the bobbin 14 as shown in FIG. 13. In this case, the movable iron core 12 includes a bobbin facing portion 124 having a facing surface 124 a facing the bobbin 14 below the gravity center eccentric portion 122. A gap g extending in the direction of the central axis C2 is formed between the facing surface 124a of the bobbin facing portion 124 and the facing surface 14a of the bobbin 14. This prevents the movable iron core 12 from contacting the bobbin 14 when the movable iron core 12 vibrates. The magnitude | size of the clearance gap g should just be a magnitude | size which the movable iron core 12 drives with the magnetic force from the winding 15 which comprises a coil. The size of the gap g is preferably about 3 mm.
  Note that the horn 111 of the modified example may not include the bobbin facing portion 124. In this case, the gap g is formed between the inclined surface 122ba of the gravity center eccentric portion 122 and the facing surface 14a of the bobbin 14.
DESCRIPTION OF SYMBOLS 1 Horn 10 Sound source device 11 Diaphragm 12 Movable core 14 Bobbin 14a Opposite surface 121 Support part 121a Support point 122 Center of gravity eccentric part 123 Insertion part 124a Opposite surface G Center of gravity G1 Center of gravity g Gap

Claims (7)

  1. A sound source device for a horn mounted on a vehicle,
    A diaphragm,
    A movable iron core including a support connected to the diaphragm via a fulcrum;
    A drive signal including a first signal component of a first frequency that resonates with the diaphragm and a second signal component of a second frequency that resonates with the movable iron core and has a chordal relationship with the first frequency is input. And a coil for driving the movable iron core,
    The fulcrum is provided at a position eccentric from the center of the diaphragm,
    The movable iron core is connected to said support portion, than the fulcrum have a center of gravity eccentric portion center of gravity is shifted in the eccentric direction of the fulcrum, are arranged inclined with respect to the perpendicular direction of the diaphragm Sound source device.
  2. The sound source device according to claim 1, wherein the center-of-gravity eccentric portion is formed to increase in the eccentric direction.
  3. A bobbin around which the coil is wound;
    The movable iron core is connected to the eccentric portion of the center of gravity, and has an insertion portion that is inserted into the bobbin.
    The center of gravity of the gravity center eccentric section, the sound source device according to claim 1 or 2 than the center of gravity of the movable iron core located at the insertion side.
  4. The sound source device according to claim 3 , wherein the center-of-gravity eccentric portion is formed so as to increase toward the insertion portion.
  5. The sound source device according to claim 3 or 4 , wherein the insertion portion is shorter than at least one of the support portion and the eccentric center portion.
  6. A bobbin around which the coil is wound;
    The bobbin has a facing surface facing the movable iron core,
    The movable iron core has a facing surface facing the bobbin,
    Wherein between the opposed surfaces of the movable iron core and the facing surface of the bobbin, the sound source device according to claim 1 or 2 gaps extending in the axial direction is formed in the bobbin.
  7. A sound source device according to claims 1 6,
    A chord including a first sound having the first frequency as a fundamental frequency and a second sound having a second frequency having a relationship between the first frequency and the chord as a fundamental frequency is input from the sound source device, and A horn comprising: a resonance tube that resonates the sound and the second sound.
JP2016193025A 2016-09-30 2016-09-30 Horn sound source device and horn equipped with the same Active JP6274285B1 (en)

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KR20200051348A (en) 2018-11-05 2020-05-13 삼성전자주식회사 Speaker module having tilted diaphragm and electronic device including the same

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5193674U (en) * 1975-01-25 1976-07-27
JPH0571045U (en) * 1992-03-02 1993-09-24 日野自動車工業株式会社 Air horn
JP2000318517A (en) * 1999-05-07 2000-11-21 Mitsuba Corp Vehicle horn
JP2012088490A (en) * 2010-10-19 2012-05-10 Denso Corp Alarm device for vehicle
JP2013216168A (en) * 2012-04-05 2013-10-24 Denso Corp Vehicle existence notifying device
JP2016109704A (en) * 2014-12-02 2016-06-20 マツダ株式会社 Method and device for producing chord-generating digital signal
JP6197904B1 (en) * 2016-03-25 2017-09-20 マツダ株式会社 Horn sound generator

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5193674U (en) * 1975-01-25 1976-07-27
JPH0571045U (en) * 1992-03-02 1993-09-24 日野自動車工業株式会社 Air horn
JP2000318517A (en) * 1999-05-07 2000-11-21 Mitsuba Corp Vehicle horn
JP2012088490A (en) * 2010-10-19 2012-05-10 Denso Corp Alarm device for vehicle
JP2013216168A (en) * 2012-04-05 2013-10-24 Denso Corp Vehicle existence notifying device
JP2016109704A (en) * 2014-12-02 2016-06-20 マツダ株式会社 Method and device for producing chord-generating digital signal
JP6197904B1 (en) * 2016-03-25 2017-09-20 マツダ株式会社 Horn sound generator

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