WO2020183865A1

WO2020183865A1 - Sound generator

Info

Publication number: WO2020183865A1
Application number: PCT/JP2019/050795
Authority: WO
Inventors: 晋宮田; 佐藤　純一
Original assignee: アンデン株式会社; パイオニア株式会社; 東北パイオニア株式会社
Priority date: 2019-03-13
Filing date: 2019-12-25
Publication date: 2020-09-17
Also published as: JPWO2020183865A1

Abstract

This sound generator comprises a sound generation body (7), a base (2), and a terminal (9). The sound generation body has a diaphragm (72) and a drive unit (73) that vibrates the diaphragm when being electrified. The base includes a base tube part (21) in which the sound generation body is accommodated, and the terminal makes an electrical connection between the inside and the outside of the base tube part. The drive unit includes a cylindrical core part (72), a voice coil (75) wound around the core part, and a magnetic circuit unit (76) that vibrates the diaphragm by applying a magnetic field to the voice coil. The sound generation body further includes: a damper (78) which is disposed on the outer periphery of the core part and serves as a cushioning material for the vibration of the core part and the voice coil; and a lead wire (79) which connects the voice coil and the terminal. The damper has a holding part (784) for holding the lead wire, and the lead wire is fixed to the holding part by means of an adhesive (100) in a region between the voice coil and the terminal.

Description

Sounder

Cross-reference to related applications

This application is based on Japanese Patent Application No. 2019-045728 filed on March 13, 2019, the contents of which are incorporated herein by reference.

This disclosure relates to a sounding device.

Conventionally, in a sounding device, the problem of disconnection of the brocade wire and short life is solved by providing a portion for fixing the brocade wire (lead wire) in the middle to the resin frame constituting the outer shape of the sounding body. There is. However, there are cases where the brocade wire cannot be fixed to the frame, such as when the frame constituting the sounding body is made of metal which is a conductor. Further, although it can be dealt with by adding fixed parts such as terminal metal, the number of parts increases, which leads to an increase in cost.

On the other hand, in Patent Document 1, by forming an insertion guide portion for a damper component composed of a non-conductor and inserting a brocade wire into the insertion guide portion, the brocade wire can be inserted without increasing the number of parts. A technique has been proposed that enables the fixation of.

Jitsukaisho 61-85997

However, as shown in Patent Document 1, when the brocade wire is inserted into the insertion guide portion of the damper part and fixed, the fixing is incomplete, and when the brocade wire is pulled, such as when assembling the sounding body to the housing, The problem was found that the curved shape and length of the brocade wire changed, and the characteristics changed, resulting in a defective product.

In view of the above points, it is an object of the present disclosure to provide a sounding device in which a lead wire such as a brocade wire is fixed more reliably.

In order to achieve the above object, according to one aspect of the present disclosure, the sounding device includes a sounding body having a diaphragm, a driving unit that vibrates the diaphragm by energization to generate sound, and a sounding body. It is equipped with a base including a base cylinder and a terminal for making electrical connections inside and outside the base cylinder. Then, the drive unit displaces the core portion and the voice coil by applying a magnetic field to the tubular core portion arranged on one surface side of the diaphragm, the voice coil wound around the core portion, and the voice coil. A magnetic circuit unit that vibrates the diaphragm, a sounding body is arranged on the outer periphery of the core portion, a damper that serves as a buffer for vibration of the core portion and the voice coil, and a lead wire that connects the voice coil and the terminal. The damper has a holding portion for holding the lead wire, and the lead wire is fixed to the holding portion by an adhesive between the voice coil and the terminal.

In this way, the lead wire is fixed to the holding part of the damper using an adhesive. Therefore, it is possible to provide a sounding device in which the lead wire is fixed to the damper more reliably.

According to one aspect of the present disclosure, the adhesive has a first adhesive that fixes the holding portion to the damper and a second adhesive that is softer and more elastic than the first adhesive, and has a second adhesive. The adhesive covers the lead wire on the voice coil side of the holding portion.

In this way, two types of adhesives are used, the lead wire and the holding portion can be firmly fixed with the first adhesive, and the stress concentration can be relaxed with the second adhesive. As a result, it is possible to suppress peeling and breakage of the first adhesive and breakage of the lead wire due to stress concentration while firmly fixing with the first adhesive, and it is also possible to obtain durability. Become.

In this case, for example, the first adhesive is configured to adhere and fix the lead wire to the holding portion on the voice coil side of the holding portion, and the second adhesive is configured to cover the lead wire while covering the first adhesive. Will be done. Further, the lead wire may be adhesively fixed to the holding portion on the terminal side of the holding portion with the first adhesive.

In addition, if the lead wire is composed of a brocade wire, the strength of the lead wire is high and it can be made difficult to break even in an environment where vibration occurs.

According to one aspect of the present disclosure, the damper has an annular bottom and an outer peripheral wall erected from the outer edge of the bottom toward the diaphragm side, and the holding portion is formed on the outer peripheral wall. It is configured by a notch, and the lead wire is fixed by an adhesive in a state of being fitted into the notch constituting the holding portion.

In this way, the holding portion can be configured by notching the holding portion, and the lead wire can be fixed to the holding portion by fixing the holding portion with an adhesive while being fitted in the holding portion.

In this case, for example, the lead wire is pulled out from the voice coil in the radial direction of the voice coil to reach the outer peripheral wall, and has a convex shape toward the diaphragm between the voice coil and the outer peripheral wall. Further, the lead wire has a convex shape toward the diaphragm side between the holding portion and the terminal. With these configurations, the lead wires can be connected in a state where there is slack due to the curved portion, and damage to each connecting portion can be suppressed.

According to one aspect of the present disclosure, a connector is formed on the outside of the base cylinder portion, a through hole is formed for communicating the inside of the connector and the inside of the base cylinder portion, and the terminal is passed through the through hole. The terminal has a flat plate rod-shaped terminal portion arranged in the through hole with one direction as the longitudinal direction, and a flat plate portion continuous from the portion of the terminal portion located inside the base cylinder portion and in the longitudinal direction. The connector has a connecting portion extending in a direction intersecting the flat plate portion, and the connecting portion is erected with respect to the flat plate portion at a position on the damper side in the direction intersecting the longitudinal direction of the flat plate portion. A standing wall is provided, and the tip of a lead wire is arranged in a groove formed at the tip of the first standing wall.

With such a structure, a terminal can be configured. In that case, for example, the tip of the lead wire is connected to the terminal at the connecting surface, and the groove portion extends from the tip of the standing wall to the connecting surface, with the portion of the flat plate portion of the connecting portion connected to the first standing wall as the connecting surface. Can be formed. With such a structure, the lead wire is fitted in the groove portion, the lead wire can be connected to the terminal on the connection surface, and the lead wire is convex toward the diaphragm between the holding portion and the terminal. Can be shaped. Further, in the case of such a structure, if the first standing wall is erected diagonally with respect to the connecting surface, it becomes easy to fit the lead wire into the groove portion. Further, if the connecting portion is provided with a second standing wall erected with respect to the flat plate portion at a position opposite to the first standing wall in the direction intersecting the longitudinal direction of the flat plate portion, the lead wire can be connected. The tip can be brought into contact with the second standing wall, and the lead wire can be prevented from coming into contact with the frame.

According to one aspect of the present disclosure, it has a frame that is open at both ends in the axial direction, one opening is closed by a diaphragm, and the other opening is closed by a drive unit. The damper is adhered to the frame at the bottom, and a through hole is formed at a position corresponding to the lead wire in the frame, and the lead wire is pulled out from the holding portion to the terminal through the through hole.

If the frame is provided with a through hole in this way, the lead wire can be pulled out from the holding portion to the terminal through the through hole. In that case, since the lead wire and the frame can be prevented from coming into contact with each other by the through hole, even if the frame is made of metal, these short circuits can be suppressed. Further, when such a through hole is provided, in a structure in which the first adhesive is provided on the terminal side of the holding portion, the first adhesive can be applied through the through hole.

More specifically, the frame has a portion that constitutes an opening on the wide opening side that is closed by the diaphragm, a portion that constitutes an opening on the narrow opening side that is closed by the drive unit, and a bottom portion of the damper. It is preferable that the structure has a surface to be adhered and a through hole is formed from a side having a wide opening width to a surface to which the bottom portion is adhered from a side having a narrow opening width.

It is a front view of the sounding apparatus which concerns on 1st Embodiment. It is a right side view of the sounding instrument shown in FIG. It is a rear view of the sounding instrument shown in FIG. It is a bottom view of the sounding apparatus shown in FIG. It is a top view of the sounding apparatus shown in FIG. It is a perspective view which looked at the sounding instrument shown in FIG. 1 from the right front. It is a perspective view which looked at the sounding instrument shown in FIG. 1 from the right rear. It is sectional drawing of VIII-VIII in FIG. It is a sectional view of IX-IX in FIG. FIG. 5 is an enlarged cross-sectional view of the housing cut at the connection point between the brocade wire of the sounding device and the damper shown in FIG. FIG. 5 is an enlarged cross-sectional view of the housing cut at the connection point between the brocade wire of the sounding device shown in FIG. 1 and the terminal. FIG. 5 is an enlarged cross-sectional view of the housing cut at the connection point between the brocade wire of the sounding device shown in FIG. 1 and the terminal. It is a front view of a terminal. It is a right side view of the terminal. It is an enlarged view of the connection part between the brocade wire and the damper in the sounding apparatus which concerns on 2nd Embodiment.

Hereinafter, embodiments of the present disclosure will be described with reference to the figures. In each of the following embodiments, parts that are the same or equal to each other will be described with the same reference numerals.

(First Embodiment)
The first embodiment will be described. The sounding device of the present embodiment is installed outside the passenger compartment of an automobile, for example, and is used to generate an alarm sound. The sounding device is provided with a housing in which two spaces are formed inside, and the sounding body arranged in the housing performs sounding.

Specifically, as shown in FIGS. 1 to 3, the housing 1 of the sounding device is composed of a resin base 2, a cover 3, and a case 4, respectively. The base 2 includes a substantially cylindrical base cylinder portion 21, and a disc-shaped cover 3 covering the opening is fitted into an opening on one end side of the base cylinder portion 21. A disc-shaped case 4 is airtightly bonded to the opening on the other end side by adhesion. The sounding body 7 (see FIG. 8), which will be described later, is assembled from the opening on the other end side of the base cylinder 21, and the sounding body 7 is assembled by airtightly joining the case 4 to this opening. The waterproof and airtightness of the side is ensured. Further, by covering the opening on one end side of the base cylinder portion 21 with the cover 3, the invasion of water or snow into the sounding body 7 is suppressed.

As shown in FIGS. 2, 6 and 7, a plurality of protrusions 21a are formed on the outer peripheral surface of the base cylinder portion 21. Further, a hook 3a protruding toward the case 4 side is formed on the outer edge portion of the cover 3, and a hook 4a protruding toward the cover 3 side is also formed on the outer edge portion of the case 4. By engaging these plurality of protrusions 21a with the

hooks

3a and 4a, the base 2 and the cover 3 and the case 4 are more firmly joined.

Then, as shown in FIGS. 8 and 9, the space inside the base cylinder portion 21 is divided into two in the axial direction by a partition wall 22 or the like provided in the base cylinder portion 21. Specifically, the first space 5 is formed by the base cylinder portion 21, the partition wall 22, the cover 3, and the diaphragm 72 provided in the sounding body 7, and the base cylinder portion 21, the partition wall 22, the case 4, and the diaphragm 72 are formed. The second space 6 is formed by.

As shown in FIGS. 8 and 9, the partition wall 22 is formed with a circular through hole 23 that communicates the first space 5 and the second space 6. Then, as shown in FIGS. 8 and 9, a sounding body 7 that generates a sound based on an electric signal is arranged in the second space 6 so as to close the through hole 23. More specifically, the through hole 23 is closed by the diaphragm 72 described later of the sounding body 7. Therefore, the second space 6 is separated from the first space 5 by the diaphragm 72.

The airtightness between the first space 5 and the second space 6 is ensured by the diaphragm 72 or the like. Therefore, in order to suppress fluctuations in the pressure applied to the diaphragm 72 due to temperature changes, although not shown, the partition wall 22 or the case 4 is provided with a ventilation hole for communicating both spaces at a place away from the through hole 23. It has been formed. A ventilation film made of a material that allows air to pass through and blocks water is attached to the ventilation holes, and the pressure fluctuation applied to the diaphragm 72 is adjusted by this ventilation film.

As shown in FIGS. 8 and 9, the shielding plate 28 is formed at a position of the partition wall 22 away from the opening end of the opening forming the through hole 23, specifically, at the center position of the through hole 23. ing. The shielding plate 28 is connected to the partition wall 22 via a plurality of beam-shaped connecting portions (not shown) extending outward in the radial direction about the shielding plate 28. Then, a portion of the through hole 23 in which the shielding plate 28 and the connecting portion are not arranged is opened at a plurality of locations, and a sound passage 81 through which the sound generated by the sounding body 7 is passed is configured.

The shielding plate 28 is for suppressing the water flow during high-pressure car washing and the snow adhering to the surface of the cover 3 from reaching the sounding body 7, and preventing damage to the sounding body 7 due to the adhering water. Inside No. 1, it is arranged between the sound emitting hole 84 and the diaphragm 72, which will be described later.

Further, the shielding plate 28 comes into contact with the diaphragm 72 when the diaphragm 72 is displaced during the airtightness inspection, and limits the displacement of the diaphragm 72 in the vibration direction. As a result, damage due to excessive deformation of the diaphragm 72 is suppressed. As shown in FIGS. 8 and 9, the shielding plate 28 is arranged in the first space 5 in a state of being separated from the diaphragm 72 so as to face the diaphragm 72, and has a shape corresponding to the diaphragm 72. There is.

The shielding plate 28 has a dome-shaped inner peripheral portion 281 that is convex toward the side opposite to the diaphragm 72, an outer peripheral portion 282 that is arranged outside the dome-shaped inner peripheral portion 282 and is inclined to the opposite side of the diaphragm 72, and an inner peripheral portion. It has a cylindrical portion 283 that protrudes from the outer edge of the 281 toward the cover 3 side. The outer peripheral portion 282, the cylindrical portion 283, and the cover 3 form the resonance chamber 82, and the inner peripheral portion 281, the cylindrical portion 283, and the cover 3 form the resonance chamber 83. The sound pressure of the sound generated by the sounding body 7 is amplified by the resonance chamber 82 and the resonance chamber 83.

As shown in FIGS. 1 to 4 and 6 to 9, a substantially square tubular connector 29 for electrically connecting the sounding body 7 to an external harness (not shown) is formed on the outside of the base cylinder portion 21. Has been done. As shown in FIG. 8, a through hole 25 is formed in a portion of the base cylinder portion 21 where the connector 29 is formed, which penetrates the base cylinder portion 21 and connects the inside of the connector 29 and the second space 6. The terminal 9 is press-fitted so as to pass through the through hole 25.

The terminal 9 is fixed to the base cylinder 21 by an adhesive inside the base cylinder 21, and the through hole 25 formed for arranging the terminal 9 is closed by the adhesive and the terminal 9. It has been. The terminal 9 is connected to a brocade wire 79, which will be described later, in the second space 6.

As shown in FIGS. 13A and 13B, the terminal 9 has a flat plate rod-shaped terminal portion 91 having one direction as the longitudinal direction, and a connecting portion 92 having a flat plate portion continuous from one end of the terminal portion 91. .. The terminal portion 91 is a portion to be inserted into the through hole 25, and is arranged so that one end is located on the second space 6 side and the other end is located inside the connector 29. The connecting portion 92 is connected to one end of the terminal portion 91 located on the second space 6 side, and a flat plate portion extends with the direction intersecting the longitudinal direction of the terminal portion 91 as the longitudinal direction.

Further, at the tip of the connecting portion 92 on the opposite side of the terminal portion 91, standing

walls

921 and 922 are provided on both sides in a direction intersecting the longitudinal direction of the flat plate portion of the connecting portion 92. The standing wall 921 corresponds to the first standing wall, and as shown in FIG. 8, is arranged at a position of the connecting portion 92 opposite to the terminal portion 91, in other words, at a position on the damper 78 side described later. Further, the standing wall 922 corresponds to the second standing wall, and is arranged at a position opposite to the standing wall 921, that is, at a position on the terminal portion 91 side of the connecting portion 92. Then, the portion of the flat plate portion of the connecting portion 92 that is connected to the standing wall 921, that is, the portion located between the standing wall 921 and the standing wall 922 is used as the connecting surface 923, and the standing wall 921 is erected diagonally with respect to the connecting surface 923. The standing wall 922 is erected in the direction perpendicular to the connecting surface 923.

Further, a groove portion 924 extending from the tip of the standing wall 921 to the connecting surface 923 is formed. The brocade wire 79 is fitted in the groove portion 924, and is connected on the connection surface 923 with a solder 104 described later to electrically connect the brocade wire 79 and the terminal 9. The terminal 9 shown in FIGS. 13A and 13B is one side of the two-pole terminal of the product, and the other terminal has a symmetrical shape with the terminal 9 shown in FIGS. 13A and 13B.

As shown in FIGS. 1 and 2, the cover 3 has a disk shape corresponding to the base cylinder portion 21. A protruding portion 31 protruding toward the inside of the housing 1 is formed at a position of the cover 3 corresponding to the cylindrical portion 283. A circular through hole 32 is formed on the outer periphery of the protruding portion 31, and the outer peripheral portion 33 and the protruding portion 31 outside the through hole 32 of the cover 3 are radially in the through hole 32 from the protruding portion 31. It is connected via a plurality of beam-shaped connecting portions 34 extending to. Then, the through holes 32 communicate with the resonance chamber 82, the resonance chamber 83, and the first space 5 including the sound passage 81, so that there are a plurality of sound emitting holes 84 that emit the sound emitted by the sounding body 7 to the outside. It is configured.

As shown in FIGS. 8 and 9, the sounding body 7 includes a frame 71, a diaphragm 72, and a drive unit 73 that vibrates the diaphragm 72.

The frame 71 has a substantially stepped cylindrical shape and is made of metal or resin, but here it is made of metal. The frame 71 is open at both ends in the axial direction, and the wider opening of the two openings of the frame 71 is closed by the diaphragm 72. The frame 71 is fixed to the base 2 by being airtightly bonded to the partition wall 22 at the end on the side where the opening is closed by the diaphragm 72.

Further, as shown in FIG. 11, a through hole 711 for communicating the inside and the outside of the frame 71 is formed at a position of the frame 71 corresponding to the brocade wire 79, which will be described later, inside and outside the frame 71. The second space 6 that communicates with each other is configured. The second space 6 is separated from the first space 5 by a partition wall 22 and a diaphragm 72.

The diaphragm 72 constitutes a diaphragm, and generates sound by being vibrated. As shown in FIG. 8, the inner peripheral portion 721 of the diaphragm 72 has a concave shape that is convex toward the second space 6 side. Further, the outer peripheral portion 722 of the diaphragm 72 is inclined toward the first space 5 side. Specifically, the outer peripheral portion 722 has a hollow truncated cone shape extending from the outer edge of the inner peripheral portion 721 toward the first space 5 side.

The inner peripheral portion 721 and the outer peripheral portion 722 face the inner peripheral portion 281 and the outer peripheral portion 282 of the shielding plate 28, respectively. Further, the diameter of the inner peripheral portion 281 is larger than the diameter of the inner peripheral portion 721. This prevents the inner peripheral portion 281 and the inner peripheral portion 721 from coming into contact with each other even if the shielding plate 28 and the diaphragm 72 come into contact with each other due to the displacement of the diaphragm 72 during the airtightness inspection, so that the inner peripheral portion 721 is damaged or deformed. This is to prevent it.

The sounding body 7 generates sound by the vibration of the diaphragm 72, but in order to generate a sound having a sufficiently high sound pressure, it is necessary to increase the distance between the diaphragm 72 and the shielding plate 28 to some extent. Therefore, the distance between the surface of the diaphragm 72 that contacts the shielding plate 28 and the surface of the shielding plate 28 that contacts the diaphragm 72 depends on the sounding operation so that the diaphragm 72 does not contact the shielding plate 28 due to the sounding operation. It is made larger than the displacement amount of the diaphragm 72.

Further, in the present embodiment, the inner peripheral portion 281 is located closer to the case 4 than the partition wall 22 in the axial direction of the base cylinder portion 21, and the outer peripheral portion 282 protrudes toward the case 4 side through the through hole 23. Is located in. As a result, when the deformation of the diaphragm 72 is restricted by the contact between the shielding plate 28 and the diaphragm 72, the diaphragm 72 can be prevented from reversing.

At the end of the outer peripheral portion 722 opposite to the inner peripheral portion 721, the shape of the outer peripheral portion 722 as viewed from the axial direction is ring-shaped, and the cross section along the radial direction is S-shaped. The unit 723 is connected. The diaphragm 72 is adhered to the frame 71 at the end of the spring portion 723. In the present embodiment, the inner peripheral portion 721, the outer peripheral portion 722, and the spring portion 723 are formed of a thin film. The outer peripheral portion 722 and the spring portion 723 are composed of one piece, and the inner peripheral portion 721 is a separate part from the outer peripheral portion 722 and the spring portion 723, and is fixed to the outer peripheral portion 722 via an adhesive.

The drive unit 73 is arranged so as to close the narrower opening width of the two openings of the frame 71. As shown in FIG. 8, the drive unit 73 includes a bobbin 74, a voice coil 75, and a magnetic circuit unit 76.

The bobbin 74 has a cylindrical shape, is connected to the outer edge of the inner peripheral portion 721 of the diaphragm 72, and is erected from the diaphragm 72 toward the inside of the second space 6. A voice coil 75 is wound around the outside of the bobbin 74. The voice coil 75 is wound around the bobbin 74 on the magnetic circuit portion 76 side of the damper 78, and although not shown, the lead-out wirings at both ends are drawn out to the side opposite to the magnetic circuit portion 76 with respect to the damper 78. There is. The bobbin 74 corresponds to the core portion.

The magnetic circuit unit 76 is for applying a magnetic field to the voice coil 75, and is a disk-shaped magnet 761 having one surface and another surface, a top plate 762 connected to one surface of the magnet 761, and a magnet 761. It has a yoke 763 connected to the other side. The magnetic circuit portion 76 is formed by arranging the magnet 761 and the top plate 762 at the bottom of the yoke 763, and a gap is provided between the cylindrical portion of the yoke 763 and the magnet 761 and the top plate 762. The bobbin 74 and the voice coil 75 are arranged so as to be inserted therein. At the outer peripheral portion of the cylindrical portion of the yoke 763 on the opening entrance side, the magnetic circuit portion 76 is integrated with the frame 71 by being fitted and adhered to the inner side of the narrow opening width of the two openings of the frame 71. ing.

With this configuration, a magnetic field generated between the side surface of the top plate 762 and the side surface of the cylindrical portion of the yoke 763 is applied to the voice coil 75 wound around the bobbin 74. There is. Therefore, when a current is passed through the voice coil 75 in which a magnetic field is applied, the bobbin 74 is displaced in the axial direction while being fitted in the cylindrical portion of the yoke 763. As a result, the diaphragm 72 vibrates and a sound is generated.

Further, as shown in FIG. 8, the sounding body 7 is provided with a damper 78. The damper 78 has a disk shape, and an opening 781 is formed in the central portion. Then, the bobbin 74 is inserted into the opening 781, and the opening end of the opening 781 of the damper 78 and the outer peripheral surface of the bobbin 74 are adhesively fixed.

The damper 78 serves as a cushioning material for vibrations of the bobbin 74 and the like, and has an annular bottom portion 782 formed of an insulating material and an opening 781 formed in the center, and an outer circumference provided on the outer edge portion of the bottom portion 782. It is configured to have a wall 783 and is adhered to a frame 71 at a bottom 782. The bottom portion 782 has a corrugated radial cross section, so that the bottom portion 782 has a shape that oscillates concentrically. The outer peripheral wall 783 is erected from the outer edge of the bottom portion 782 toward the diaphragm 72 side, and in the present embodiment, the outer diameter gradually increases as the distance from the bottom portion 782 increases. As shown in FIG. 9, a holding portion 784 formed by cutting out a part of the outer peripheral wall 783 is formed in a part of the damper 78. The brocade wire 79, which will be described later, is held by the damper 78 by the holding portion 784. The holding structure of the brocade wire 79 by the holding portion 784 will be described in detail later.

Also, the sounding body 7 is provided with a brocade wire 79. The brocade wire 79 is electrically connected to the lead wires at both ends of the voice coil 75 by soldering or the like, and is drawn out from the bobbin 74 and the voice coil 75 in the radial direction. The brocade wire 79 is a lead wire having high strength as a power feeding lead wire and is unlikely to be broken even in an environment where vibration occurs, and has a curved surface. By connecting the brocade wire 79 to the terminal 9 via the solder 104, the voice coil 75 is electrically connected to the external harness through the connector 29. The connection structure between the brocade wire 79 and the voice coil 75 and the connection method until the brocade wire 79 drawn from the voice coil 75 is connected to the terminal 9 will also be described later.

As described above, the frame 71 is formed with a through hole 711 at a position corresponding to the brocade wire 79. Therefore, the brocade wire 79 is pulled out from the holding portion 784 to the terminal 9 through the through hole 711. Further, as shown in FIG. 11, the through hole 711 is sized so that at least the drawing portion of the brocade wire 79 from the holding portion 784 is exposed when viewed from the axial direction of the frame 71, and the brocade wire 79 contacts the frame 71. It is designed not to be done. Therefore, even if the frame 71 is made of metal, it is possible to prevent the brocade wire 79 from being short-circuited with the frame 71. Further, in the present embodiment, the through hole 711 is opened from the wide opening side of the frame 71 toward the narrow opening side, and is opened to the surface where the bottom portion 782 of the damper 78 and the frame 71 are adhered to each other. I'm letting you.

As described above, the sounding device of the present embodiment is configured. The sounding device configured in this way is arranged outside the vehicle interior, and more specifically, is arranged inside the front bumper of the vehicle so that the cover 3 is located on the front side of the vehicle with respect to the case 4. Then, when the voice coil 75 is energized based on the sound source signal from the outside of the sound generator, the diaphragm 72 vibrates and a sound is emitted from the sounding body 7. This sound passes through the sound passage 81 and the like, the sound pressure is amplified by the

resonance chambers

82 and 83, and is emitted to the outside from the sound emitting hole 84 and the like. As a result, even in a vehicle such as an electric vehicle in which the running noise is quiet, it is possible to notify the surroundings of the approach of the vehicle by generating an alarm sound from the sounding device.

Also, during the airtightness inspection of the sounding device, a pressure difference is generated between the first space 5 and the second space 6. Specifically, the first space 5 is depressurized in a state where the ventilation holes (not shown) are closed, or the second space 6 is pressurized by sending air from the ventilation holes to the second space 6. The pressure in the second space 6 becomes higher than the pressure in the first space 5. As a result, the inner peripheral portion 721 and the outer peripheral portion 722 of the diaphragm 72 are displaced toward the first space 5, and the diaphragm 72 is deformed so as to bulge toward the first space 5.

At this time, the deformed diaphragm 72 comes into contact with the shielding plate 28, which limits the deformation of the diaphragm 72. That is, the shielding plate 28 arranged inside the housing 1 suppresses the inversion and deformation of the diaphragm 72 instead of the jig that holds the diaphragm 72. Therefore, the airtightness inspection can be performed without using a jig for pressing the diaphragm 72.

Subsequently, the holding structure of the brocade wire 79 by the holding portion 784, the connection structure between the brocade wire 79 and the voice coil 75, and the connection method until the brocade wire 79 drawn from the voice coil 75 is connected to the terminal 9. The details of.

First, the holding structure of the brocade wire 79 by the holding portion 784 will be described. The holding portion 784 is intended for fixing and holding the brocade wire 79, and holds the brocade wire 79 so that it will not come off even if stress due to vibration of the diaphragm 72, the voice coil 75, or the like is generated.

As shown in FIG. 9, the holding portion 784 is configured by making a slit-shaped notch in a part of the outer peripheral wall 783 of the damper 78. The notch constituting the holding portion 784 may have a width as long as it is narrower than the thickness of the brocade wire 79, but here it is configured to have no width. Further, the notch constituting the holding portion 784 is formed from the tip of the outer peripheral wall 783, and is set to a depth to an intermediate position of the height of the outer peripheral wall 783, that is, a position higher than the bottom portion 782, and reaches the bottom portion 782. It is formed up to no position. By inserting the brocade wire 79 into the holding portion 784, the brocade wire 79 has a width, so that the brocade wire 79 is temporarily held by the holding portion 784 by the elastic restoring force of the damper 78 and the brocade wire 79. .. Since the depth of the holding portion 784 is set to a position higher than that of the bottom portion 782, the brocade wire 79 is held in a state where it does not contact the bottom portion 782.

However, simply inserting the brocade wire 79 into the holding portion 784 is not sufficient to hold the brocade wire 79. Therefore, in order to fix the brocade wire 89 and the holding portion 784, the brocade wire 79 is adhesively fixed to the holding portion 784 with the adhesive 100. In the present embodiment, the brocade wire 79 is fixed by the adhesive 100 on the side from the holding portion 784 toward the voice coil 75. As the adhesive 100, two types of the first adhesive 101 and the second adhesive 102 are used. In the case of the present embodiment, since the first adhesive 101 is covered with the second adhesive 102 and cannot be seen from the surface, it is shown by a broken line in FIGS. 8 and 9.

The first adhesive 101 is made of a material that can be fixed with high strength due to the anchor effect due to the curved shape of the surface of the brocade wire 79, and is made of, for example, an acrylic or epoxy adhesive. The second adhesive 102 is made of a material having elasticity softer than that of the first adhesive 101, and is made of, for example, a silicone-based adhesive. It suffices to sufficiently fix either the first adhesive 101 or the second adhesive 102, but here, the brocade wire 79 is fixed by the second adhesive 102 while being firmly fixed by the first adhesive 101. By protecting the base of the fixed structure, the durability of the fixed structure can be obtained.

That is, although the first adhesive 101 enables fixing with high strength, stress concentration occurs at or near the bonding portion between the first adhesive 101 and the brocade wire 79 due to the vibration, and the first adhesive 101 Peeling or breakage, disconnection of the brocade wire 79, etc. may occur. On the other hand, since only the second adhesive 102 is a soft material, it may not be able to be firmly fixed. In particular, when there is an oil film on the surface of the brocade wire 79, it adheres to the brocade wire 79 due to the influence. There is a possibility that the property will deteriorate and sufficient fixing will not be possible.

Therefore, for fixing to the holding portion 784, the first adhesive 101 is applied, and the second adhesive 102 is applied so that the stress concentration is relaxed. Since stress concentration occurs inside the holding portion 784, the second adhesive 102 is applied to the position of the root inside the holding portion 784 of the brocade wire 79. Further, the first adhesive 101 is covered while being in contact with the holding portion 784 so that the stress concentration at the root of the brocade wire 79 is relaxed in a wider range, and the voice coil 75 side of the first adhesive 101. The second adhesive 102 is formed so as to cover the brocade wire 79 as well. More specifically, the first adhesive 101 and the second adhesive 102 are arranged so as to surround the entire circumference of the brocade wire 79, and the first adhesive 101 provides stronger fixing and the second adhesive. The 102 makes it possible to relax the stress concentration more effectively.

Further, since the brocade wire 79 is fixed in the middle between the voice coil 75 and the terminal 9 by the first adhesive 101, the natural frequency can be increased by shortening the string length of the brocade wire 79. Therefore, there is a concern that stress will be concentrated at the root due to vibration or displacement, but by covering the root of the brocade wire 79 with the elastic soft second adhesive 102, it is possible to suppress the concentration of stress. It is possible to ensure durability against operating displacement.

Next, the connection structure between the brocade wire 79 and the voice coil 75 and the connection method until the brocade wire 79 drawn from the voice coil 75 is connected to the terminal 9 will be described.

The brocade wire 79 and the voice coil 75 are connected by soldering or the like. Since stress due to vibration of the voice coil 75 or the like is likely to be applied to this connection portion as well, it is adhered with an adhesive 103 in order to suppress disconnection of the brocade wire 79. However, since the brocade wire 79 and the voice coil 75 are firmly connected by soldering or the like, it is not necessary to firmly fix them with the adhesive 103, and it is sufficient if the stress concentration can be relaxed. Therefore, the adhesive 103 is made of a material having the same soft elasticity as the second adhesive 102 described above. The adhesive 103 is also arranged so as to surround the entire circumference of the brocade wire 79 so that the stress concentration can be relaxed more effectively.

Then, as shown in FIG. 8, the brocade wire 79 is bent from the state where it is directed to the diaphragm 72 side from the connection point with the voice coil 75 to the side opposite to the diaphragm 72 and is directed to the holding portion 784. Further, the brocade wire 79 is bent again toward the diaphragm 72 on the outer peripheral side of the holding portion 784, then further bent toward the side opposite to the diaphragm 72 and directed toward the terminal 9, and is fitted into the groove portion 924 of the vertical wall 921. ing. Therefore, the brocade wire 79 has a convex shape on the diaphragm 72 side between the voice coil 75 and the holding portion 784, and also has a convex shape on the diaphragm 72 side between the holding portion 784 and the terminal 9. There is. In other words, the brocade wire 79 slackens between the voice coil 75 and the holding portion 784 on the diaphragm 72 side of the holding portion 784, and between the holding portion 784 and the terminal 9 on the diaphragm 72 side of the connecting surface 923. I'm sorry.

Further, the brocade wire 79 is fitted in the groove portion 924, and the tip thereof faces the side opposite to the diaphragm 72 while facing outward in the radial direction of the voice coil 75. Then, the brocade wire 79 is joined to the connection surface 923 by the solder 104.

In such a structure, the connection method until the Kinshi wire 79 is connected to the terminal 9 is performed as follows.

First, the brocade wire 79 is fixed to the holding portion 784 when the sounding body 7 is assembled, before the diaphragm 72 is joined to the frame 71. Specifically, after the bobbin 74 and the voice coil 75 are contact-fixed to the damper 78, the brocade wire 79 connected to the voice coil 75 is bent toward the damper 78 to hold the brocade wire 79 at the holding portion 784. .. After applying the first adhesive 101 in this state, the second adhesive 102 is further applied on it. As a result, the fixing of the brocade wire 79 to the holding portion 784 is completed.

At this time, the tip of the brocade wire 79 fixed to the holding portion 784 is pulled out from the through hole 711 of the frame 71.

Then, the sounding body 7 which has been assembled by joining the diaphragm 72 to the frame 71 is housed in the base cylinder 21 and is adhesively fixed to the partition wall 22. Then, the tip of the brocade wire 79 is fitted into the groove portion 924 formed on the vertical wall 921 and the connecting surface 923. Since the standing wall 921 is erected diagonally with respect to the connecting surface 923, it can be easily inserted into the groove portion 924 by pushing the brocade wire 79 from above. Further, since there is a standing wall 922, the tip of the brocade wire 79 comes into contact with the standing wall 922 and does not come into contact with the base cylinder portion 21. At this time, since the groove portion 924 is formed up to the connecting surface 923, when the tip of the brocade wire 79 is pushed toward the diaphragm 72 and fitted into the groove portion 924, the tip of the brocade wire 79 is in the opposite direction to the diaphragm 72. The voice coil 75 is tilted so as to face outward in the radial direction, and is positioned so as to be in contact with the vertical wall 922. Therefore, the brocade wire 79 has a convex shape toward the diaphragm 72 between the holding portion 784 and the terminal 9. In this state, the brocade wire 79 is joined to the connection surface 923 with the solder 104 to join the brocade wire 79 and the terminal 9.

In this way, the brocade wire 79 is held by the holding portion 784 or connected to the terminal 9, so that the brocade wire 79 has the above-mentioned shape. Since the brocade wire 79 is connected between the voice coil 75 and the holding portion 784 and between the holding portion 784 and the terminal 9 in a state of being loosened by the curved portion without being stretched, the diaphragm 72 and the like are formed. Even if the coil vibrates, each connection can be prevented from being damaged.

In addition to the length of the brocade wire 79, the position where the brocade wire 79 is fixed to the holding portion 784 and the position where the brocade wire 79 is connected to the terminal 9 are adjusted so that the brocade wire 79 can be loosened.

As described above, in the sounding device of the present embodiment, the brocade wire 79 is fixed to the holding portion 784 of the outer peripheral wall 783 of the damper 78 by using the adhesive 100. Therefore, it is possible to provide a sounding device in which the brocade wire 79 is more reliably fixed to the damper 78.

In addition, two types of adhesive 100 are used, the first adhesive 101 firmly fixes the brocade wire 79 and the holding portion 784, and the second adhesive 102 relieves stress concentration. As a result, while firmly fixing with the first adhesive 101, it is possible to suppress peeling or breakage of the first adhesive 101 based on stress concentration, breakage of the brocade wire 79, etc., and obtain durability. Is also possible.

(Second Embodiment)
The second embodiment will be described. Since this embodiment is the same as the first embodiment in that the fixing structure by the adhesive 100 is changed with respect to the first embodiment, only the parts different from the first embodiment will be described.

In the first embodiment, the voice coil 75 side of the outer peripheral wall 783 of the damper 78 was firmly fixed by the first adhesive 101, and the second adhesive 102 was arranged so as to cover the first adhesive 101. However, for strong fixation, it may be anywhere.

Therefore, in the present embodiment, as shown in FIG. 14, the fixing by the first adhesive 101 is performed on the side away from the voice coil 75 from the outer peripheral wall 783, that is, on the terminal 9 side. Even in this way, the brocade wire 79 can be firmly fixed to the damper 78 by the first adhesive 101.

However, since the stress applied to the brocade wire 79 is concentrated on the voice coil 75 side of the outer peripheral wall 783 of the damper 78, alleviating the stress concentration at that location leads to the protection of the breakage of the brocade wire 79. Therefore, the second adhesive 102 is formed so as to be in contact with the holding portion 784 on the voice coil 75 side of the outer peripheral wall 783 of the damper 78. Even with such a configuration, the same effect as that of the first embodiment can be obtained.

Also in the present embodiment, as in the first embodiment, the through hole 711 is opened to the surface where the bottom portion 782 of the damper 78 and the frame 71 are adhered to each other. Therefore, when the first adhesive 101 is arranged closer to the terminal than the outer peripheral wall 783 as in the present embodiment, the first adhesive is placed from the outside of the drive unit 73 on the narrow opening side of the frame 71. It is possible to apply 101.

(Other embodiments)
The present disclosure is not limited to the above-described embodiment, and can be appropriately modified without departing from the gist of the present disclosure.

For example, the case where the first adhesive 101 and the second adhesive 102 are used as the adhesive 100 has been described, but this is a more preferable form, and even if one kind of adhesive is used for strong fixing. good.

Further, although the holding portion 784 is configured by a notch having no width, a configuration having a width smaller than the thickness of the brocade wire 79 may be used. Further, the damper 78 may be reinforced with respect to other portions at the position of the holding portion 784. In addition, the shape and material of each part constituting the sounding device can be changed as appropriate. For example, the outer peripheral wall 783 of the damper 78 is erected diagonally with respect to the bottom 782, but the structure may be erected in the vertical direction.

Claims

It is a sounding device that produces sound by vibrating the diaphragm (72).
A sounding body (7) having the diaphragm and a driving unit (73) that vibrates the diaphragm by energization to generate sound.
A bass (2) including a bass tube (21) in which the sounding body is housed,
A terminal (9) for making electrical connections inside and outside the base cylinder is provided.
The drive unit
A tubular core portion (74) arranged on one side of the diaphragm and
The voice coil (75) wound around the core and
A magnetic circuit unit (76) that displaces the core portion and the voice coil by applying a magnetic field to the voice coil and vibrates the diaphragm.
The sounding body is
A damper (78) arranged on the outer periphery of the core portion and serving as a cushioning material for vibration of the core portion and the voice coil,
A lead wire (79) for connecting the voice coil and the terminal is provided.
The damper has a holding portion (784) in which the lead wire is held.
The lead wire is a sounding device fixed to the holding portion by an adhesive (100) between the voice coil and the terminal.
The adhesive is
The first adhesive (101) for fixing to the damper in the holding portion, and
It has a second adhesive (102), which is softer and more elastic than the first adhesive, and has.
The sounding device according to claim 1, wherein the second adhesive covers the lead wire on the voice coil side of the holding portion.
The first adhesive adheres and fixes the lead wire to the holding portion on the voice coil side of the holding portion.
The sounding device according to claim 2, wherein the second adhesive covers the lead wire while covering the first adhesive.
The sounding device according to claim 2, wherein the first adhesive is the lead wire adhesively fixed to the holding portion on the terminal side of the holding portion.
The sounding device according to any one of claims 1 to 4, wherein the lead wire is composed of a brocade wire (79).
The damper has an annular bottom portion (782) and an outer peripheral wall (783) erected from the outer edge portion of the bottom portion toward the diaphragm side.
The holding portion is composed of a notch formed in the outer peripheral wall.
The sounding device according to any one of claims 1 to 5, wherein the lead wire is fixed by the adhesive in a state of being fitted into a notch constituting the holding portion.
The lead wire is pulled out from the voice coil in the radial direction of the voice coil to reach the outer peripheral wall, and has a convex shape toward the diaphragm between the voice coil and the outer peripheral wall. The sounding device according to claim 6.
The sounding device according to claim 6 or 7, wherein the lead wire has a convex shape on the diaphragm side between the holding portion and the terminal.
A connector (29) is formed on the outside of the base cylinder portion, and a through hole (25) is formed to communicate the inside of the connector and the inside of the base cylinder portion, and the terminal is formed in the through hole. Has been passed through
The terminal
A flat plate rod-shaped terminal portion (91) arranged in the through hole with one direction as the longitudinal direction, and
It has a flat plate portion continuous from a portion of the terminal portion located inside the base cylinder portion and a connecting portion (92) extending in a direction intersecting the longitudinal direction.
The connecting portion includes a first standing wall (921) erected with respect to the flat plate portion at a position on the damper side in a direction intersecting the longitudinal direction of the flat plate portion.
The sound generator according to any one of claims 6 to 8, wherein the tip of the lead wire is arranged in a groove (924) formed at the tip of the first standing wall.
The tip of the lead wire is connected to the terminal on the connection surface, with the portion of the flat plate portion of the connection portion connected to the first standing wall as a connection surface (923).
The sounding device according to claim 9, wherein the groove is formed so as to extend from the tip of the first standing wall to the connecting surface.
The sounding device according to claim 10, wherein the first standing wall is erected diagonally with respect to the connecting surface.
The connecting portion includes a second standing wall (922) erected with respect to the flat plate portion at a position opposite to the first standing wall in a direction intersecting the longitudinal direction of the flat plate portion.
The sounding device according to claim 11, wherein the tip of the lead wire is in contact with the second standing wall.
It has a frame (71) that is open at both ends in the axial direction, one opening is closed by the diaphragm, and the other opening is closed by the drive.
The damper is adhered to the frame at the bottom and
Any one of claims 6 to 12 in which a through hole (711) is formed at a position corresponding to the lead wire in the frame, and the lead wire is pulled out from the holding portion to the terminal through the through hole. The sounder described in one.
The frame has a portion that constitutes an opening on the wide opening side that is closed by the diaphragm, a portion that constitutes an opening on the narrow opening width that is closed by the drive portion, and the bottom portion of the damper. Has a surface to which it is adhered,
The sounding device according to claim 13, wherein the through hole is formed from a side having a wide opening width to a surface to which the bottom portion is adhered from a side having a narrow opening width.