JP2017163304A - Electroacoustic transducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably reproduce or collect sounds by accurately and surely positioning a vibrator including curvature plates like a Ryffel type speaker and a general-purpose actuator like a voice coil motor.SOLUTION: An electroacoustic transducer comprises: a vibrator 1 including a wing-like vibration part 7 with which a valley 6 is formed between single side parts of convex surfaces 5 of a pair of curvature plates 11; and a conversion part 2 for converting a vibration in a depth direction of the valley 6 of the vibrator 1 into an electric signal corresponding to the vibration. The conversion part 2 is connected to junctions 13 of the side parts forming the valley 6. Between the junctions 13 and the conversion part 2, a projection 41 and a recess are disposed which are fitted to each other in a state where relative movements of the junctions 13 and the conversion part 2 are restricted.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electroacoustic transducer suitable for a speaker for reproducing sound or a microphone for collecting sound.

A typical dynamic speaker is a speaker that emits sound by a piston motion that reciprocally drives a cone-shaped vibrating body with a voice coil motor. It functions as a point sound source at a low frequency and has a wide directional characteristic. The directivity becomes sharper in a band above the frequency at which the aperture and the half wavelength of the reproduced sound are substantially equal.
On the other hand, the Riffel type speaker has a vibrating body composed of a pair of rectangular curved plates, has a wide directivity in the mid-high range, and the sound spreads in the lateral direction along the bending direction of the diaphragm, and the vertical direction. Has the characteristic of hardly spreading.

As such a Riffel type speaker, there is a conventional one disclosed in Patent Document 1, for example. In this patent document 1, a conductor pattern as a voice coil is printed on the central portion of a polymer resin film, and the central portion is folded and bonded to form a flat plate-shaped portion having a conductor pattern. And a vibrating body integrally formed with the curved first and second vibrating portions is formed, and a flat plate-like portion of the vibrating body is disposed in a magnetic gap in the magnetic circuit, A speaker having a structure in which a tip is fixed to a support member is disclosed.
The speaker disclosed in Patent Document 1 has a configuration in which a long voice coil along the length direction is attached to a central folded portion of a diaphragm, and the diaphragm is driven integrally by the driving force of the voice coil. Therefore, the voice coil has a special shape and tends to be expensive.

  On the other hand, Patent Document 2 discloses an electric device having a vibrating body such as a Riffel speaker having a structure in which one side portions of a pair of vertically-divided cylindrical curved plates are joined to each other and a valley portion is formed therebetween. An acoustic transducer is disclosed, and an actuator is connected to a joint portion of the vibrating body. The electroacoustic transducer disclosed in Patent Document 2 can be manufactured at low cost because a voice coil motor or the like having a cylindrical voice coil that is widely used as a general dynamic speaker can be connected as an actuator. Can do. In this case, as a connecting structure between the vibrating body and the actuator, a reinforcing tool along the length direction of the valley is attached to the joint of the vibrating body so that the driving force of the actuator can be stably transmitted over the entire length of the valley. Alternatively, the end portion of the actuator is covered with a grooved cap, and the joint portion of the vibrating body is fixed to the groove.

JP 2002-78079 A Japanese Patent Laying-Open No. 2015-109578

By the way, in a general dynamic speaker, when connecting a cone-shaped vibrating body and a voice coil motor, a positioning jig is inserted into a cylindrical voice coil, and the cone is inserted through the positioning jig. The end of the oscillating body can be connected to the voice coil.
However, in the electroacoustic transducer disclosed in Patent Document 2, since the joint portion is formed in a straight line along the length direction of the trough portion, it is difficult to position the actuator in the middle of the joint portion, and a positional shift may occur. There is.

  The present invention has been made in view of such circumstances, and a vibrating body having a curved plate such as a Riffel type speaker and a general-purpose actuator such as a voice coil motor are positioned accurately and reliably, and the sound is The purpose of this is to stably reproduce or collect.

  The electroacoustic transducer of the present invention includes a vibrating body having a wing-like vibrating portion in which a trough is formed between one side of each convex surface of a pair of curved plates, and the depth of the trough of the vibrating body. A converter that converts vibration along a direction and an electrical signal corresponding to the vibration, and the converter is connected to a joint of the side that forms the valley, and these joints A convex portion and a concave portion that are fitted in a state in which the relative movement between the joint portion and the conversion portion is constrained are disposed between the projection portion and the conversion portion.

  This electroacoustic transducer is connected in a state in which the relative movement of the joint portion and the conversion portion is constrained by fitting the convex portion and the concave portion between the joint portion and the conversion portion of the vibrator, It is possible to accurately position the vibrating body and the conversion unit and reliably prevent the positional deviation.

In the electroacoustic transducer of the present invention, an adapter cap is attached to the conversion portion, a groove for fitting the joint portion is formed in the adapter cap, and the convex portion and the inner surface of the groove are formed between the joint portion and the inner surface of the groove. A recess may be provided.
Since the adapter cap is provided separately from the converter and the vibrator is connected, it is possible to make the adapter cap into a shape suitable for the connection between the joint of the vibrator and the actuator. Since the convex portion and the concave portion are provided between the connecting portion and the connecting portion, both can be more stabilized and more securely fixed.

In the electroacoustic transducer of the present invention, it is preferable that a raised portion protrudes from a part of the end face of the adapter cap, and the groove is formed in the raised portion.
Compared to the case where the entire adapter cap is formed corresponding to the depth of the groove, the height of the portion other than the raised portion can be suppressed by forming the groove in the raised portion. The weight can be reduced and the response to vibration can be improved.

  According to the electroacoustic transducer of the present invention, the convex portion and the concave portion are fitted to each other, so that a vibrating body having a curved plate such as a Riffel type speaker and a general-purpose actuator such as a voice coil motor can be accurately and reliably obtained. Therefore, sound can be reproduced or collected stably.

It is a disassembled perspective view of the speaker (electroacoustic transducer) of 1st Embodiment of this invention. It is a perspective view which shows the assembly state of the speaker of FIG. It is a front view of the speaker of FIG. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3. It is the disassembled perspective view which looked at the vibrating body, the adapter cap, and the voice coil from the lower side. It is a perspective view of a vibrating body. It is a front view of the vibrating body of FIG. It is arrow sectional drawing which follows the BB line of FIG. It is a disassembled perspective view which shows the vibrating body and voice coil in 2nd Embodiment of this invention. It is a disassembled perspective view which shows the vibrating body and voice coil in 3rd Embodiment of this invention.

Hereinafter, an embodiment in which an electroacoustic transducer of the present invention is applied to a speaker will be described with reference to the drawings.
<First Embodiment>
1 to 8 show a speaker (an example of an electroacoustic transducer) according to a first embodiment of the present invention.
1. Overall Configuration A speaker 100 according to this embodiment includes a vibrating body 1, an actuator (an example of a conversion unit) 2 that reciprocates the vibrating body 1, and a support frame 3 that supports the vibrating body 1 and the actuator 2. And an edge portion 4 for supporting the vibrating body 1 on the support frame 3 so as to be reciprocally movable.
1 and 2, the vertical direction is set so that the side on which the edge portion 4 is provided is on the upper side and the side on which the actuator 2 is provided on the lower side. Let the length direction of the trough part in be a vertical direction, and let the direction orthogonal to this be a horizontal direction. Further, the surface facing upward is referred to as the front surface, and the surface facing downward is referred to as the back surface. Further, as illustrated, the vertical direction may be referred to as the x direction, the horizontal direction as the y direction, and the vertical direction as the z direction.

2. Configuration of Each Part (1) Configuration of Vibrating Body As shown in an enlarged view of FIGS. 6 to 8, the vibrating body 1 includes a pair of curved plates 11 having convex surfaces 5 formed in parallel and adjacent convex surfaces 5. A wing-like vibration part 7 having a surface shape in which a valley part 6 is formed between one side parts (or between convex surfaces 5 of a pair of curved plates 11), and both ends of the valley part 6 of the wing-like vibration part 7 And a cone portion 8 formed in a conical shape extending outward so as to surround the outer peripheral edge of the wing-like vibrating portion 7. In addition, a pair of curved board 11 is comprised by two members among the some members obtained by dividing | segmenting a cylindrical member in the vertical direction (axial direction of a cylinder part).
The wing-like vibrating portion 7 in the illustrated example is composed of a pair of curved plates 11 each having a convex surface 5, and the side portions forming the valley portions 6 of both curved plates 11 are joined to each other. Yes.
In addition, the pair of convex surfaces 5 formed by the pair of curved plates 11 are arranged in parallel and facing each other in the direction of the convex toward the same surface side. In other words, the pair of curved plates 11 are not arranged such that the convex surface 5 of one curved plate of the pair of curved plates 11 and the concave surface of the other curved plate face each other. The concave surfaces are not arranged so as to face each other. The one side portions of each of the pair of convex surfaces 5 are disposed closer to each other than the other side portions of the pair of convex surfaces 5, or the other side portions of each of the pair of convex surfaces 5 are By arranging the two side portions so as to be in contact with each other, a valley portion 6 having a bottom near one side portion is formed between the pair of convex surfaces 5.

Further, the convex surface 5 of the curved plate 11 does not necessarily have to be a single circular arc surface, and a cross-section along the circumferential direction (lateral direction) of the convex surface 5 is a curvature such as a parabolic shape or a spline curve. It is possible to employ one having a constant or continuous change, one having a square cylindrical surface, one having a plurality of steps in a step shape, and the like. Further, the convex surface 5 of the present embodiment is curved in one direction (circumferential direction of the convex surface 5: lateral direction) and is perpendicular to the one direction (the vertical direction of the convex surface 5 and the axial direction of the curved plate 11). Although it is linear, the convex surface 5 is a curved surface (convex surface) in which the curvature of the cross section along the vertical direction is smaller than the curvature of the cross section along the horizontal direction (a constant curvature or a plurality of curvatures that change continuously). May be. As shown in FIG. 8, in the joint portion 13, the two curved plates 11 are joined at a slight interval, and the longitudinal direction of the convex surface 5 is between the two curved plates 11 along the joint portion 13. A trough 6 is formed in a straight line along the line.
As shown in FIGS. 6 and 7, the valley portion 6 (or joint portion 13) of the wing-like vibrating portion 7 is arranged in a straight line along the diameter direction of the cone portion 8, and the valley is formed on the axial center of the cone portion 8. The portion 6 is integrated in a coaxial manner in which the center position in the length direction is arranged. The axis passing through the center in the length direction of the valley portion 6 is defined as the axis M of the wing-like vibrating portion 7. In this embodiment, the axis M of the wing-like vibrating portion 7 and the axis of the cone portion 8 coincide.
Further, in order to obtain a uniform reproduced sound, as shown in FIG. 8, a cross section of the curved plates 11 along the circumferential direction (y direction) of the convex surface 5 is a line with respect to the axis M of the wing-like vibrating portion 7. It is preferable to form it symmetrically. However, in the present invention, the cross sections of the two curved plates 11 do not necessarily have line symmetry.
And the convex part 41 which makes a part of the junction part 13 protrude in the depth direction of the trough part 6 in the center position (on the axial center M of the wing-like vibration part 7) of the junction part 13 is integrated. Is formed. In this embodiment, the convex portion 41 is formed in a strip shape along the length direction of the joint portion 13 with substantially the same width (thickness) as the joint portion 13.

The cone portion 8 extends from a side portion (end portion) opposite to the joint portion 13 of the two curved plates 11 and closes both longitudinal ends of the valley portions 6 of the two curved plates 11. It is formed in a planar shape. As shown in FIG. 7, the outer peripheral edge of the curved plate 11 of the wing-like vibrating part 7 is formed in an arc shape on the side opposite to the side part forming the valley part 6 in front view. In this case, the curved plate 11 has a slightly longer diameter in the direction orthogonal to the valley 6 than the diameter in the length direction of the valley 6, but is formed in a substantially semicircular shape in front view. A conical portion 8 is provided so as to connect the arc-shaped outer peripheral edges of the curved plate 11 and substantially surround the entire circumference of the wing-like vibrating portion 7, and the outer peripheral edge is formed in a circular shape when viewed from the front. The outer peripheral edge of the cone portion 8 is connected to the inner peripheral edge of the edge portion 4.
In the cross section passing through the axial center of the cone portion 8 (axial center M of the wing-like vibrating portion 7), as shown in FIGS. 4 and 8, the vibrating body 1 has the joint portion 13 of the curved plate 11 disposed on the lower side. The most part in the height direction from the joint part 13 is the wing-like vibration part 7, and the cone part 8 is arranged in a slight height range at the upper end of the wing-like vibration part 7.

The material of the vibrating body 1 is not limited, and a material such as a synthetic resin, paper, or metal generally used as a diaphragm for a speaker can be used. Vacuum molding, injection molding, press molding, and the like can be employed. For example, a film made of a synthetic resin such as polypropylene or polyester can be molded relatively easily by vacuum molding.
The vibrating body 1 of this embodiment is formed by integrally molding a single film made of synthetic resin, and the joint portion 13 is formed by molding the central portion of the film into a U-shaped cross-section.

(2) Configuration of Each Part Other than Vibrating Body The actuator 2 uses, for example, a voice coil motor, and includes a voice coil 20 provided at the joint 13 of the curved plate 11 and a magnet mechanism 21 fixed to the support frame 3. Composed.
The voice coil 20 is obtained by winding a coil 20b around a cylindrical bobbin 20a.

And the adapter cap 45 for fixing the vibrating body 1 to a connection state is provided in the upper end part of this voice coil 20. As shown in FIG. The adapter cap 45 is formed in a circular shape into which the bobbin 20a of the voice coil 20 can be fitted in a plan view, and is fixed to a state where it is put on the upper end portion of the bobbin 20a of the voice coil 20, as shown in FIG. As shown, a groove 46 for fitting the joint portion 13 of the wing-like vibrating portion 7 is formed along the diametrical direction on the upper surface, and when the joint portion 13 is fitted to the groove 46 at the bottom of the groove 46, A concave portion 47 (the concave portion is pointed from the back side in FIG. 5) that fits with the convex portion 41 of the joint portion 13 is formed. The recess 47 is provided at the center position of the adapter cap 45 (on the axis of the voice coil 20).
Therefore, the vibrating body 1 is connected to the bobbin 20a of the voice coil 20 through the adapter cap 45 at the joint portion 13 of the wing-like vibration portion 7, and the joint portion 13 is accommodated in the groove 46 of the adapter cap 45. Since the convex portion 41 and the concave portion 47 are fitted in the groove 46, they are connected in a state in which movement is constrained in both the direction orthogonal to the groove 46 and the length direction of the groove 46, and are bonded. It is fixed with agents.
A raised portion 48 is formed along the diameter direction on the upper end surface of the adapter cap 45, and a groove 46 is formed in the raised portion 48. Then, an inclined surface 49 is formed with a downward slope in a direction perpendicular to the length direction of the groove 46 from the protruding end (opening end of the groove 46) of the raised portion 48. Since the groove 46 is formed in the raised portion 48 and formed on the inclined surface 49 so as to cut off both sides thereof, the weight is reduced as compared with the case where the whole is formed at a height corresponding to the depth of the groove 46. Yes.

  The outer periphery of the voice coil 20 is supported by the support frame 3 via the damper 22, and the voice coil 20 can reciprocate along the axial direction of the voice coil 20 with respect to the support frame 3. The damper 22 may be made of a material used for a general dynamic speaker.

  The magnet mechanism 21 includes an annular magnet 23, a ring-shaped outer yoke 24 fixed to one pole of the magnet 23, and an inner yoke 25 fixed to the other pole. By disposing the tip of the central pole portion 25 a in the outer yoke 24, an annular magnetic gap 26 is formed between the outer yoke 24 and the inner yoke 25, and a voice coil is formed in the magnetic gap 26. 20 ends are arranged in the inserted state.

The support frame 3 is formed of, for example, a metal material. In the example illustrated in FIG. 1 and the like, the flange portion 30 formed in a rectangular frame shape, a plurality of arm portions 31 extending below the flange portion 30, and the arm portions. And an annular frame portion 32 formed at the lower end of 31. And the inner peripheral surface of the flange part 30 is formed in the circumferential surface, the vibration body 1 is arrange | positioned inside that the junction part 13 is faced below, and the cone part 8 of the vibration body 1 is the edge part 4 Is supported on the upper surface of the flange portion 30. Therefore, the edge portion 4 is formed in a circular ring shape corresponding to the cone portion 8 of the vibrating body 1. The edge portion 4 can also be made of a material used for a general dynamic speaker.
In addition, the degree of deformation (rigidity) of the vibrating body 1 in the depth direction of the valley 6 is greater than the degree of rigidity (rigidity) of the edge 4 in the depth direction of the valley 6. Thus, the vibrating body 1 and the edge part 4 are formed. In other words, when the vibrating body 1 vibrates in the depth direction of the valley portion 6, the vibrating body 1 and the edge portion 4 have a deformation amount of the vibrating body 1 caused by the vibration of the vibrating body 1. It is comprised so that it may become smaller than the deformation amount of the edge part 4 caused by.
In this invention, the support part 35 which supports the vibrating body 1 so that a vibration is possible is comprised by the support frame 3 and the edge part 4 in this embodiment.
In the edge portion 4, the inner peripheral edge of the edge portion 4 is fixed to the outer peripheral edge of the cone portion 8, and the outer peripheral edge of the edge portion 4 is fixed to the support frame 3. Accordingly, the edge portion 4 supports the vibrating body 1 while allowing the entire vibrating body 1 to vibrate in the vertical direction.

  In a state where the vibrating body 1 is attached to the support frame 3, the curved plate 11 is curved so as to be convex upward as shown in FIG. 1 and 2, reference numeral 33 indicates a terminal for connecting the voice coil 20 to the outside. Reference numeral 34 denotes attachment holes through which screws for fixing the speaker 100 to the housing or the like are passed. The attachment holes 34 are provided at the four corners of the flange portion 30 whose outer edge is formed in a substantially square shape. ing.

3. Operation When the driving current corresponding to the audio signal flows through the voice coil 20 of the actuator 2 fixed to the vibrating body 1, the speaker 100 configured in this way is subjected to a change in magnetic flux caused by the driving current and a change in the magnetic gap 26. Due to the magnetic field, a driving force corresponding to the driving current acts on the voice coil 20 to vibrate the voice coil 20 in a direction perpendicular to the magnetic field (the axial direction of the voice coil 20, the vertical direction indicated by the arrow in FIG. 4). As a result, the vibrating body 1 connected to the voice coil 20 vibrates along the depth direction of the valley 6 of the wing-like vibrating portion 7 (the axial direction of the cone portion 8), and the reproduced sound is radiated from the surface. Is done.

In this case, the vibrating body 1 is composed of a wing-like vibrating portion 7 disposed so as to constitute most of the height direction thereof, and a cone portion 8 disposed in a limited range on the upper side thereof. The reproduced sound radiated from the convex surface 5 of the curved plate 11 in the wing-like vibrating portion 7 constituting the majority becomes dominant.
For this reason, similarly to the diaphragm used in the Riffel type speaker, the sound directivity in the lateral direction along the circumferential direction of the convex surface 5 of the wing-shaped vibrating portion 7 is wide and narrow in the vertical direction. Further, like the diaphragm used in the Riffel type speaker, it has a wide directivity in the mid-high range. In this case, if both ends of the valley portion 6 are in an open state, a part of the sound wave radiated by the vibrating body 1 passes through the open space and escapes to the back surface side of the curved plate 11, but the cone portion 8, both ends of the valley portion 6 are closed, so that the sound wave can be prevented from coming off to the back surface side, and sound can be efficiently emitted from the entire front surface of the vibrating body 1. it can.
Moreover, since the vibrating body 1 is supported by the edge portion 4 so that the outer peripheral edge of the cone portion 8 can reciprocate and vibrate, the entire area from the joint 13 to the outer peripheral edge is driven by the actuator 2. It vibrates uniformly, causing vibration due to so-called piston motion. For this reason, like a dynamic speaker, it has a high sound pressure even in a low sound range.

That is, in the speaker 100, in a low frequency range, sound is radiated by the piston motion in which the cone portion 8 and the wing-like vibration portion 7 are integrated, and the reproduction frequency is increased and the amplitude of the vibrating body is reduced. Therefore, the radiated sound from the wing-like vibrating portion 7 becomes dominant, and a wide directivity sound is reproduced even in a high frequency range.
As described above, it is possible to realize a full-range speaker unit that can be reproduced with a wide directivity over the entire audible band from the low sound range to the mid-high sound range with a single speaker unit.
In such an operation of the speaker 100, the vibrating body 1 and the actuator 2 are connected via the adapter cap 45, the joint portion 13 of the vibrating body 1 is accommodated in the groove 46 of the adapter cap 45, and the joining is performed. Since the convex portion 41 of the portion 13 and the concave portion 47 in the groove 46 are fixed to each other, they are not displaced, and the axial center of the cone portion 8 (the axial center of the wing-like vibrating portion 7) does not occur. M) direction and the axial direction of the voice coil 20 are securely fixed and the reproduced sound can be radiated stably.

Second Embodiment
FIG. 9 shows a connecting portion between the vibrating body and the actuator of the second embodiment. The second embodiment is the same as the first embodiment in that the convex portion 41 is formed at the joint portion 13 of the wing-like vibrating portion 7 of the vibrating body 1, but no adapter cap is provided. The convex portion 41 is configured to be accommodated in the bobbin 20a of the voice coil 20.
The convex portion 41 of the joint portion 13 is formed to have a length slightly shorter than the inner diameter of the hole (concave portion) 51 of the bobbin 20a and is fitted in the bobbin 20a. The upper end is fixed with an adhesive or the like.
Also in the case of the second embodiment, since the convex portion 41 of the joint portion 13 is fitted in the hole 51 of the bobbin 20a, the movement of the joint portion 13 in the length direction and its orthogonal direction is constrained. The positional deviation between the vibrating body 1 and the actuator is prevented, and the reproduced sound can be radiated stably.

<Third Embodiment>
Moreover, it is also possible to make a vibrating body consisting only of a wing-like vibrating portion that does not have the cone portion 8. In the third embodiment shown in FIG. 10, as the wing-like vibrating portion 55, the convex surface 5 is formed by a pair of rectangular curved plates 56 in a plan view, and the valley portion 6 is formed between the side portions of the convex surface 5. Is formed. In this case, both end portions of the valley portion 6 are closed by the valley portion closing portion 57, and the edge portion on the opposite side to the valley portion 6 of the valley portion closing portion 57 and the curved plate 56 is an edge portion 58 having a rectangular frame shape. And is supported by a support frame having a rectangular frame-shaped flange (not shown).
On the other hand, the convex part 41 is formed in the joint part 13 of both the curved plates 56 so that a part thereof may extend in the depth direction of the valley part 6, and the bobbin 20a of the voice coil 20 is similar to the second embodiment. It is fixed in a state where it fits into the recess 51.

<Modification>
In addition, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
For example, in the first embodiment and the second embodiment described above, the outer side of the wing-like vibrating part is connected to the cone-shaped cone part, and the outer peripheral edge of the cone part is connected to the circular ring-like edge part. The vibration part is formed in a shape that is longer in the length direction of the valley part than the direction orthogonal to the valley part, and the cone part is formed in an elliptical conical surface shape that is long along the length direction of the valley part of the wing-like vibration part. May also be formed in an elliptical ring shape. In addition, the cone portion may have a shape other than a conical surface or an elliptical conical surface as long as it is a diaphragm used as a general dynamic speaker. The combined shape may be sufficient as long as it is formed in a conical shape as a whole. The shape of the wing-like vibrating portion can also be appropriately changed according to the shape of the cone portion.

Also, a convex part is formed at the joint part of the vibrating body and a concave part is formed on the bobbin or adapter cap of the actuator (voice coil motor). May be. Also, the convex portion is formed in a strip shape along the length direction of the valley portion, and the concave portion is also fitted into the convex portion, but the convex portion is formed in a pin shape and the concave portion is the pin-shaped convex portion. You may form in the hole shape which fits. In that case, the convex portion and the concave portion are formed on the axis of the cone portion of the vibrating body (center of the wing-like vibrating portion 7) and on the center of the actuator (on the axis of the voice coil).
Furthermore, as a convex part, a part of the joint part was formed so as to extend in the depth direction of the valley part, but it was formed integrally on the side surface of the joint part so as to increase a part of the thickness of the joint part. In this case, the recess may be formed on the inner surface of the groove of the adapter cap, for example. Of course, a concave portion may be formed on the side surface of the joint portion so as to reduce a part of the thickness thereof, and a convex portion that fits the concave portion may be formed on the inner side surface of the groove of the adapter cap.

  In addition, it is preferable that the vibrating body is integrally formed with a cone portion and a wing-like vibrating portion, but it is also possible to separately mold and bond them. The wing-like vibration part may also be formed by bonding one side part of two curved plates, except when integrally molding as a single plate-like material, and the joint part is also U-shaped. In addition to the form formed by folding back into a shape, a form formed by folding a plate-like material into a V shape may be used, or one side portion of two curved plates may be bonded to each other with a predetermined width to form a band plate shape. It is good also as a form. Moreover, it is good also as a form etc. which adhered reinforcement members, such as a strip-shaped reinforcement board or a reinforcement wire, along the junction part, and reinforced the junction part linearly.

Moreover, in order to reinforce the rigidity of the vibration surface on the back surface of the vibration body, a rib, a block, or the like may be added and fixed to the back surface of the vibration body. A plate-like or rod-like rib can be provided along the lateral direction on the convex surface with respect to the radiation surface of the wing-like vibrating portion. As described above, this wing-like vibrating part has a characteristic that the convex surface is a radiating surface of the reproduced sound, so that the directivity in the lateral direction along the circumferential direction of the convex surface is wide but narrow in the vertical direction. For this reason, even if a plate-like or bar-like rib is provided along the lateral direction on the convex radiation surface, there is little acoustic influence.
Furthermore, although the voice coil motor is applied as the conversion unit that reciprocally drives the vibrating body, a piezoelectric element or the like may be used instead of the voice coil motor.

  In the above embodiments, the present invention is applied to a speaker. However, the present invention can also be applied to a microphone. When the present invention is applied to a speaker, a conversion unit such as a voice coil motor converts an electric signal based on a sound signal into vibration of a vibrating body. However, when the present invention is applied to a microphone, a voice coil is used as the conversion unit. A motor or the like can be used, and the conversion unit in that case converts the vibration of the vibrating body that receives a sound wave to vibrate into an electric signal. In the microphone to which the present invention is applied, the convex surface of the curved plate in the cone portion and the wing-like vibration portion is the vibration surface, and the entire vibration body vibrates uniformly, thereby maintaining directivity while maintaining sensitivity. As a result, the sound can be collected with a wide directivity over a wide frequency band from a low sound range to a high sound range.

  DESCRIPTION OF SYMBOLS 1 ... Vibrating body, 2 ... Actuator (conversion part), 3 ... Support frame, 4 ... Edge part, 5 ... Convex surface, 6 ... Valley part, 7 ... Wing-like vibration part, 8 ... Cone part, 11 ... Curved plate, 13 ... Joint part, 20 ... voice coil, 20a ... bobbin, 21 ... magnet mechanism, 22 ... damper, 23 ... magnet, 24 ... outer yoke, 25 ... inner yoke, 25a ... pole part, 26 ... magnetic gap, 30 ... flange part, DESCRIPTION OF SYMBOLS 31 ... Arm part, 32 ... Annular frame part, 33 ... Terminal, 34 ... Mounting hole, 41 ... Convex part, 45 ... Adapter cap, 46 ... Groove, 48 ... Raised part, 49 ... Inclined surface, 51 ... Hole (concave part) , 55 ... Wing-like vibrating part, 56 ... Curved plate, 57 ... Valley closing part, 58 ... Edge part

Claims (3)

  Corresponding to the vibration body having a wing-like vibration part in which a trough is formed between one side of each convex surface of the pair of curved plates, the vibration along the depth direction of the trough of the vibration body, and the vibration A conversion unit that performs conversion with an electrical signal to be converted, and the conversion unit is connected to the joint portion of the side portion forming the valley portion, and between the junction portion and the conversion portion, An electroacoustic transducer characterized in that a convex portion and a concave portion which are fitted in a state in which relative movement between the joint portion and the conversion portion is constrained are disposed.   An adapter cap is attached to the conversion part, a groove for fitting the joint part is formed in the adapter cap, and the convex part and the concave part are disposed between the joint part and the inner surface of the groove. The electroacoustic transducer according to claim 1.   The electroacoustic transducer according to claim 1 or 2, wherein a protruding portion is formed so as to protrude from a part of an end surface of the adapter cap, and the groove is formed in the protruding portion.