JP2017169006A - Electroacoustic transducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deformation of a curved plate and regenerate or collect stable sound.SOLUTION: The electroacoustic transducer includes: a vibrating body 1 having a wing-like vibrating portion 7 in which a valley portion 6 is formed between one side portions of the convex surface of each of a pair of curved plates; and a converting section 2 for converting the vibration along the depth direction of the valley section 6 of the vibrating body 1 and the electric signal corresponding to the vibration. The side portions forming the valley portion 6 are joined together and a joining portion 13 is formed in a curved shape in cross-section along the direction orthogonal to the depth direction of the valley portion 6.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.

  Further, Patent Document 2 discloses an electroacoustic transducer having a vibrating body such as a Riffel speaker having a structure in which one side portions of a pair of curved plates are joined to each other and a valley portion is formed therebetween. A structure such as attaching a reinforcing tool along the length of the trough to the joint of the vibrator, or covering the end of the actuator with a grooved cap, and fixing the joint of the vibrator to the groove. It is said. With such a structure, the driving force of the actuator is stably transmitted over the entire length of the valley.

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

  However, in the vibrating bodies described in these patent documents, although the bending rigidity with respect to the fold line perpendicular to the length direction of the valley portion (stiffness against bending around the axis perpendicular to the length direction of the valley portion) is high, the valley portion Rigidity is low with respect to bending around the axis parallel to the length direction. For this reason, there is a problem that the curved plate is likely to be deformed when bending along a fold line parallel to the length direction of the trough (bending around the axis parallel to the length direction of the trough) acts. In particular, when the sound output level of the speaker increases, distortion is likely to occur in the output due to deformation of the curved plate.

  The present invention has been made in view of such circumstances, and an object thereof is to prevent the deformation of a curved plate and to reproduce or collect sound stably.

  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. And a conversion part that converts the vibration along the direction and an electric signal corresponding to the vibration, and the side parts forming the valley part are joined together, and the joined part is in the depth direction. The cross section along the direction orthogonal to is formed in a curved shape.

  In this electroacoustic transducer, since the joint portion of the vibrating body is formed in a curved shape, the convex surface of the curved plate also has a curved shape in a cross section parallel to the direction orthogonal to the circumferential direction, particularly in the vicinity of the joint portion. For this reason, the rigidity with respect to the bending around the axis parallel to the direction orthogonal to the circumferential direction of the curved plate is increased, and deformation of the curved plate is prevented.

In the electroacoustic transducer according to the aspect of the invention, it is preferable that the curved shape is provided point-symmetrically with respect to the center in the length direction of the valley portion.
Since the curved shape is point-symmetric with respect to the center in the length direction of the valley, the convex surfaces of the pair of curved plates also have a symmetric surface shape, and vibration characteristics due to the convex surfaces of the curved plates are less likely to be impaired.

In the electroacoustic transducer of the present invention, an adapter cap is attached to the conversion portion, and a curved groove corresponding to the curved shape of the joint portion is formed in the adapter cap, and the joint portion is fitted in the groove. It is good to combine in the state.
Since the joint of the vibrating body and the groove of the adapter cap are formed in a curved shape, the vibration body is unlikely to be displaced in the length direction of the groove of the adapter cap, and the positioning accuracy between the vibrating body and the conversion portion can be improved. it can.

  According to the electroacoustic transducer of the present invention, since the joint portion of the vibrating body is formed in a curved shape, not only the bending around the axis perpendicular to the length direction of the valley portion but also the circumferential direction of the curved plate is orthogonal. As a result of the increased rigidity against bending around the axis parallel to the direction and the deformation of the curved plate, 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. It is arrow sectional drawing which follows the AA line which passes along the axial center of the wing-like vibration part in FIG. It is a perspective view of a vibrating body and an edge part. FIG. 6 is a front view of the vibrating body in FIG. 5. It is arrow sectional drawing which follows the BB line which passes along the axial center of the wing-like vibration part in FIG. It is arrow sectional drawing which follows the CC line which passes along the axial center of the wing-like vibration part in FIG. It is a disassembled perspective view which shows the vibrating body and edge part in 2nd 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. The length direction of the valley 6 as a whole is defined as the vertical direction, and the direction perpendicular thereto is defined as the 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 in FIGS. 5 to 8, the vibrating body 1 includes a pair of curved plates 11 formed in parallel and one of the adjacent curved plates 11. A wing-like vibrating portion 7 having a surface shape in which a valley portion 6 is formed between the side portions (or between the convex surfaces of the pair of curved plates 11), and both ends of the valley portion 6 of the wing-like vibrating portion 7 are closed and wing-like. The cone part 8 formed in the shape of the conical surface extended outside so that the outer periphery of the vibration part 7 may be enclosed is provided. 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 constituted by a pair of curved plates 11, and the side portions forming the valley portions 6 of both curved plates 11 are joined to each other.
In addition, the pair of convex surfaces 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 so that the convex surface 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. One side of each of the pair of convex surfaces is disposed closer to each other than the other side of the pair of convex surfaces, or the other side of each of the pair of convex surfaces is spaced apart By arranging and arranging one side portions in contact with each other, a valley portion 6 having a bottom near one side portion is formed between the pair of convex surfaces.
And the side parts which form this trough part 6 are joined, and the junction part 13 is formed. As shown in FIG. 7, in the joint portion 13, the two curved plates 11 are joined at a slight interval, and along the joint portion 13, between the two curved plates 11, a convex surface as a whole. A trough 6 is formed along the vertical direction.
In this case, the junction 13 has a curved cross section along a direction orthogonal to the depth direction of the valley 6. For this reason, the trough 6 is also formed in a curved shape. Specifically, as shown in FIG. 6, there is one curvature from the center position in the length direction of the valley portion 6 (axis M of the wing-like vibrating portion 7 described later) to one end portion of the valley portion 6. It is formed in an arc shape with a radius R, and from the center position to the other end is formed in an arc shape with the same radius of curvature R in the opposite direction to the arc between the one end. Is formed in an S shape having a gentle plan view. In other words, the curved shape of the joint 13 is formed point-symmetrically about the axis M.
The length direction (longitudinal direction, x direction) of the valley portion 6 described above is a direction connecting both ends of the valley portion 6 curved in an S shape.

  In addition, the convex surface of the curved plate 11 does not necessarily have a single circular arc in a cross section along the circumferential direction (lateral direction), and the curvature is constant or constant, such as a series of a plurality of curvatures, a parabolic shape, or a spline curve. A continuously changing one, a rectangular tube shape, a step shape having a plurality of stepped portions, and the like can be adopted. Further, the convex surface of the present embodiment is curved in one direction (circumferential direction of the convex surface: lateral direction), and in a direction orthogonal to the one direction (vertical direction of the convex surface and the axial direction of the curved plate 11), a trough portion is formed. In the vicinity of, the valley is formed in a curved shape, so that the convex surface is also formed in a gentle curved shape, and changes so as to become a substantially linear shape as the distance from the valley is increased.

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. 6, 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 a front view. A cone portion 8 is provided so as to connect the arc-shaped outer peripheries of the curved plate 11 and substantially surround the entire circumference of the wing-like vibrating portion 7, and the outer perimeter of the cone portion 8 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.
As shown in FIGS. 6 and 7, the valley portion 6 (or the joint portion 13) of the wing-like vibrating portion 7 is disposed along the diameter direction of the cone portion 8 as a whole, and the axial center of the cone portion 8. It is integrated in the same coaxial shape in which the center position in the length direction of the valley portion 6 is disposed. 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.
In the cross section passing through the axial center of the cone portion 8 (axial center M of the wing-like vibrating portion 7), the vibrating body 1 has the joint portion 13 of the curved plate 11 on the lower side as shown in FIGS. In this case, most of the height direction from the joint portion 13 is the wing-like vibration portion 7, and the cone portion 8 is arranged in a range of a slight height at the upper end of the wing-like vibration portion 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 the adapter cap 45 is put on the upper end portion of the bobbin 20a of the voice coil 20. FIG. As also shown, a groove 46 for fitting the joint portion 13 of the wing-like vibrating portion 7 is formed on the upper surface along the diametrical direction.
In the vibrating body 1, the joint portion 13 of the wing-like vibration portion 7 is connected to the bobbin 20 a of the voice coil 20 via the adapter cap 45, and the joint portion 13 is accommodated in the groove 46 of the adapter cap 45, adhesive, etc. It is fixed by. In this case, since the joint portion 13 of the vibrating body 1 is formed in a curved shape, the groove 46 of the adapter cap 45 is also formed in a curved shape corresponding to the joint portion 13, and the joint portion 13 is tightly connected to the groove 46. It is designed to fit.

  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 denotes 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 of the curved plate 11 of the wing-like vibrating portion 7 constituting the majority becomes dominant.
For this reason, like the diaphragm used in the Riffel type speaker, the sound directivity in the lateral direction along the circumferential direction of the convex surface of the curved plate 11 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 a loudspeaker 100, the vibrating body 1 has the joint 13 formed in a curved shape. Therefore, the convex surface of the curved plate 11 is not a single cylindrical surface, and particularly in a portion close to the valley 6. A cross-sectional shape parallel to the direction (x direction) is formed in a curved shape like the joint portion 13. Therefore, the bending rigidity with respect to the bending line parallel to the longitudinal direction (x direction) is also increased.
Thus, the vibrating body 1 of the speaker 100 has not only high bending rigidity with respect to the bending line in the direction (y direction) orthogonal to the vertical direction (x direction), but also the bending line parallel to the vertical direction (x direction). Since the bending plate 11 has a high bending rigidity, the deformation of the curved plate 11 is small. Therefore, even when the sound output level is high, the output is not distorted and the sound can be reproduced stably. The magnitude of the curvature radius R of the trough 6 described above is determined by the balance between the rigidity required for the vibrating body 1 and the influence on the vibration characteristics due to the convex shape of the curved plate 11.
Further, the vibrating body 1 and the actuator 2 are connected via an adapter cap 45, and the groove 46 of the adapter cap 45 is formed in a curved shape like the joint portion 13 of the vibrating body 1, and these are fitted. Since they are fixed in a state, these positional deviations do not occur, and the axial direction of the cone portion 8 (axial center M of the wing-like vibrating portion 7) and the axial direction of the voice coil 20 are surely matched. The playback sound can be radiated stably.

Second Embodiment
In contrast to the first embodiment having the vibrating body composed of the wing-shaped vibrating portion 7 and the cone portion 8, it is also possible to use a vibrating body including only the wing-shaped vibrating portion that does not have the cone portion 8. In the second embodiment shown in FIG. 9, as the wing-like vibrating portion 55, a convex surface is formed by a pair of rectangular curved plates 56 in plan view, and a trough portion 6 is formed between each side portion of the convex surface. It is a thing. 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).
And the cross section in which the junction part 13 follows the direction orthogonal to the depth direction of the trough part 6 is formed in curve shape. Also in this case, the curved shape is provided so as to be point-symmetric with respect to the center position in the length direction of the valley portion 6 (the axis M of the wing-like vibrating portion 55).
Thus, also in the vibrating body formed by the rectangular curved plate 56, by forming the joint portion 13 of the curved plate 56 in a curved shape, the length direction of the valley portion 6 (perpendicular to the circumferential direction of the curved plate 56). , The rigidity against bending around the axis parallel to the x direction) is increased, the deformation of the curved plate 56 is prevented, and stable vibration can be performed.

<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 above-described embodiment, the curved shape of the joint (or valley) is changed from the axis M of the wing-like vibration portion to one end portion in an arc shape with one curvature radius, and to the other end portion. Although it is formed in a reverse arc shape, it is also possible to form a wave shape by alternately connecting three or more arcs. In addition to the case where the entire joint (or valley) has a curved shape, a part having a linear shape is also included, for example, the central portion in the length direction is a straight shape, It can also be a curved shape. In any case, it is preferable to have a point-symmetric shape with respect to the center of the valley portion in the length direction (axis M of the wing-like vibrating portion).

  In the first embodiment described above, the outside of the wing-like vibrating portion is connected to the cone-shaped cone portion, and the outer peripheral edge of the cone portion is connected to the circular ring-shaped edge portion. A shape that is longer in the length direction of the valley than in the direction orthogonal to the ring, and the cone portion is formed in a long elliptical cone shape along the length direction of the valley portion of the wing-like vibration portion, and the edge portion is also an elliptical ring You may form in a 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.

  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 shape formed so as to be folded back into a plate shape, a plate-shaped material may be formed so as to be folded back into a V shape, or one side portion of two curved plates is bonded to each other with a predetermined width to form a belt plate shape It is good also as a form formed in. Moreover, it is good also as a form etc. which strengthened the junction part by adhering reinforcement members, such as a strip-shaped reinforcement board or a reinforcement wire, along a junction part.

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 of the curved plate with respect to the radiating 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 ... Vibration body, 2 ... Actuator (conversion part), 3 ... Support frame, 4 ... Edge part, 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, 31 ... Arm part 32 ... annular frame part, 33 ... terminal, 34 ... mounting hole, 45 ... adapter cap, 46 ... groove, 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 The side portions forming the valley portions are joined together, and the joint portion has a curved cross section along the direction orthogonal to the depth direction. An electroacoustic transducer having a shape.   2. The electroacoustic transducer according to claim 1, wherein the curved shape is provided point-symmetrically with respect to the center of the valley in the length direction.   An adapter cap is attached to the conversion portion, and a curved groove corresponding to the curved shape of the joint portion is formed on the adapter cap, and the adapter portion is coupled with the joint portion fitted in the groove. The electroacoustic transducer according to claim 1 or 2, characterized in that