WO2009093291A1 - Plaque de vibration piézoélectrique - Google Patents

Plaque de vibration piézoélectrique Download PDF

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Publication number
WO2009093291A1
WO2009093291A1 PCT/JP2008/003502 JP2008003502W WO2009093291A1 WO 2009093291 A1 WO2009093291 A1 WO 2009093291A1 JP 2008003502 W JP2008003502 W JP 2008003502W WO 2009093291 A1 WO2009093291 A1 WO 2009093291A1
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Prior art keywords
vibration
piezoelectric diaphragm
shape
piezoelectric
pedestal
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PCT/JP2008/003502
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English (en)
Japanese (ja)
Inventor
Fujihiko Kobayashi
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Fujihiko Kobayashi
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Application filed by Fujihiko Kobayashi filed Critical Fujihiko Kobayashi
Publication of WO2009093291A1 publication Critical patent/WO2009093291A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers

Definitions

  • the present invention relates to a piezoelectric diaphragm that is used as a diaphragm for a piezoelectric speaker or the like by vibrating when an electric signal is applied to a piezoelectric body that is closely fixed to a pedestal.
  • a piezoelectric diaphragm of a piezoelectric speaker for example, the one disclosed in Patent Document 1 is known.
  • This piezoelectric diaphragm has a plurality of vibrating parts that are divided into arbitrary shapes and have different elastic moduli, and each vibrating part is integrally coupled to a pedestal formed in a circular shape, an elliptical shape, an octagonal shape, or the like.
  • a piezoelectric body formed in substantially the same shape as the pedestal portion is closely fixed to the surface of the pedestal portion.
  • the present invention has been made in view of such circumstances, and an object of the present invention is to provide a piezoelectric diaphragm capable of reducing the suppression interference generated at the coupling portion between the pedestal portion and the vibration portion and obtaining a beautiful reproduced sound. There is.
  • the invention described in claim 1 of the present invention includes a pedestal portion to which a piezoelectric body is closely fixed and fixed to a surface, and a vibration portion integrally coupled to the pedestal portion.
  • the piezoelectric diaphragm is characterized in that suppression interference preventing means for preventing suppression interference of the vibration part is provided at a coupling portion between the base part and the vibration part.
  • the suppression interference preventing means is formed in a recess formed by cutting the vibration portion side surface of the coupling portion in the thickness direction, and in a groove shape on the vibration portion surface of the coupling portion.
  • the concave portion provided is a concave portion provided by forming the vibration portion side surface of the coupling portion in a plan view curve.
  • the concave portion has its shape and position as in the invention of claim 3. Is set according to the elastic modulus of the vibration part, or the shape thereof is preferably formed in a straight line, a curved line, or a combination thereof as in the invention described in claim 4.
  • the vibration portion is formed in a uniform, stepped or tapered shape as in the invention described in claim 5, or the pedestal portion as in the invention described in claim 6. It is preferable that one or a plurality of bonds are bonded.
  • the pedestal portion is preferably formed in a circular shape, an elliptical shape, a triangular shape, a square shape, or a polygonal shape in plan view.
  • the side view shape of the side surface is formed into a linear shape extending outward from a predetermined position of the outer peripheral line of the pedestal portion, a curved shape including a parabola, or a combination thereof. It is preferable.
  • the invention according to claim 9 is divided radially by a pedestal portion having a piezoelectric body closely fixed to the surface, and a dividing line integrally coupled to the pedestal portion and extending from the pedestal portion toward the outer periphery.
  • the suppression interference preventing means is a groove formed in at least one of the front surface and the back surface of the coupling portion of the pedestal portion and the vibration portion as in the invention described in claim 10.
  • the dividing line is formed by any one of a straight line, a curved line bulging outward or inward, a parabola, or a combination thereof.
  • the outer peripheral shape of the vibrating part is formed by either a curve, a straight line, or a combination thereof, or as in the invention described in claim 13, It is preferable to have steps with different thicknesses.
  • the plurality of vibrating portions may be formed such that all or a part of the dividing edge serving as the tip of the dividing line has a circular shape, an elliptical shape, a parabolic shape, or the like in plan view. It is preferably formed in a curved shape.
  • the vibration portion is suppressed at the coupling portion between the pedestal portion to which the piezoelectric body is closely fixed to the surface and the vibration portion integrally coupled to the pedestal portion. Since the suppression interference prevention means for preventing the interference is provided, the suppression interference prevention means can reduce the suppression interference generated at the coupling portion of the base part and the vibration part, and a piezoelectric diaphragm having a beautiful reproduced sound can be obtained. be able to.
  • the suppression interference preventing means is formed by a concave portion provided on the side surface or the vibration portion of the coupling portion.
  • the suppression interference preventing means can be easily formed at the coupling portion, and the cost increase of the piezoelectric diaphragm can be suppressed.
  • the invention described in claim 3 in addition to the effect of the invention described in claim 2, since the shape and position of the recess are set according to the elastic modulus of the vibration part, the form of the vibration part, etc. Due to the concave portions corresponding to the above, suppression interference of the vibration portion can be effectively reduced.
  • the thickness of the vibrating part is formed in a uniform, stepped or tapered shape. It can be applied to a piezoelectric diaphragm having a saddle-shaped vibrating section, and can be used for various piezoelectric speakers, thereby improving versatility.
  • the vibration part is connected to the pedestal part by one or more, various numbers of vibration parts are provided.
  • the present invention can be applied to the piezoelectric diaphragm having it, and the versatility can be further improved.
  • the planar view shape of the pedestal is formed in a circle, an ellipse, a triangle, a square, or a polygon. Therefore, it can be applied to a piezoelectric diaphragm having pedestals of various shapes, and the versatility can be further improved.
  • the side surface shape of the vibration part is a straight line or a parabola extending outward from a predetermined position of the outer peripheral line of the pedestal part. Therefore, it can be applied to piezoelectric diaphragms having vibrating portions having various side-surface shapes, and the versatility can be further improved.
  • suppression interference prevention means in the thickness direction is provided at the coupling portion between the pedestal part and the vibration part, and a dividing line is formed from the suppression interference prevention means. Since it is radially extended, the suppression interference prevention means can reduce the suppression interference generated at the joint portion of the base portion and the vibration portion, and the vibration of the suppression interference is reduced. Can be smoothly propagated along the dividing line to the outer peripheral side of the vibrating portion, and a piezoelectric diaphragm having a beautiful reproduced sound can be obtained.
  • the suppression interference preventing means is a groove formed on at least one of the front surface or the back surface of the coupling portion of the base portion and the vibration portion. Therefore, by setting the height and width of the groove according to the form of the vibration part, etc., it is possible to reliably suppress the suppression interference and to easily form the suppression interference prevention means at the coupling portion. The cost increase of the piezoelectric diaphragm can be suppressed.
  • the dividing line for dividing the plurality of vibrating parts is a straight line, a curve bulging outward or inward, and a parabola. Since it is formed by either or a combination thereof, the vibration of the pedestal portion can be more smoothly propagated to the outer peripheral side of each vibration portion.
  • the outer peripheral shape of the vibration part is formed of either a curve or a straight line, or a combination thereof. Therefore, it is possible to obtain piezoelectric diaphragms having various outer shapes, and improve versatility such as being usable for various piezoelectric speakers.
  • the vibration part has a step having a different thickness, and therefore the vibration state of the vibration part is changed by the step. The versatility can be further improved, such as being usable for various types of piezoelectric speakers.
  • FIG. 16 show first to sixth embodiments of a piezoelectric diaphragm according to the present invention.
  • 1 to 3 show the first embodiment, in which FIG. 1 is a plan view, FIG. 2 is a plan view taken along the line AA in FIG. 1, and FIG. 3 is a plan view showing a modification thereof.
  • the piezoelectric diaphragm 1 includes a pedestal portion 1 a having a substantially rectangular shape (square shape) in a plan view, and a substantially rectangular shape in a plan view integrally coupled to the pedestal portion 1 a by a coupling line K. It has the shape-like vibration part 1b.
  • the pedestal portion 1a is formed to be thicker than the vibration portion 1b by a predetermined size, and the back surfaces of the pedestal portion 1a and the vibration portion 1b are flush with each other, for example, by integral molding.
  • the recessed part 3 as a suppression interference prevention means is provided in the coupling line K part of the vibration part 1b toward the inner side from the side surface of the vibration part 1b.
  • the concave portion 3 is formed by notching the end side surface of the vibrating portion 1b on the side of the pedestal portion 1a into a square shape having a width w1 and a depth (depth) h1, and having a width w1 and a depth.
  • h1 is appropriately set according to the material (elastic modulus), size, shape, and the like of the piezoelectric diaphragm 1.
  • the pedestal portion 1a and the vibration portion 1b are formed of a material capable of propagating acoustic vibration, such as iron, copper, brass, stainless steel (SUS material), titanium, carbon graphite, and polyamide resin.
  • the piezoelectric diaphragm 1 when an electric signal is applied to the piezoelectric body 4 (see FIG. 2) that is tightly fixed to the surface of the pedestal portion 1a, the piezoelectric body 4 is distorted, and this distortion is caused by the pedestal portion. It is propagated to the vibration part 1b through 1a and converted into acoustic vibration by the vibration part 1b. At this time, since the notch-shaped recess 3 is provided in the connecting line K portion of the base 1a and the vibration portion 1b, the hatched region in FIG. 1 corresponding to the depth h1 of the recess 3 is free vibration. Region R is formed.
  • the suppression interference in the coupling line K portion which is likely to occur particularly when a large electrical signal is applied to the piezoelectric body 4, does not reach the free vibration region R, and the suppression interference in the coupling line K portion is prevented.
  • FIG. 3 shows a modification of the piezoelectric diaphragm 1.
  • the piezoelectric diaphragm 1 shown in FIG. 3A is provided with the concave part 3 on one side surface of the vibration part 1b in the piezoelectric diaphragm 1 at a position that is separated from the coupling line K by a predetermined supply.
  • the piezoelectric diaphragm 1 shown in 3 (b) is formed by combining the linear portion 5 and the curved portion 6 on the side surface of the vibrating portion 1b, and having different planar views on both side surfaces. Further, the piezoelectric diaphragm 1 shown in FIG.
  • the piezoelectric diaphragm 1 shown in FIG. 3 (d) is formed so that the width of the oscillating portion 1b on the pedestal portion 1a side is narrowed and the outer peripheral side is widened, and both side surfaces extend radially in plan view.
  • the vibration part 1b having a recess 3 deeper than the recess 3 on the side opposite to the side to which the vibration part 1b of the pedestal part 1a is coupled is different from the width w1 of the recess 3 formed on the surface (that is, a total of 2 Two vibrating parts 1b) are provided. Further, in the piezoelectric diaphragm 1 shown in FIG.
  • the shape of both side surfaces of one vibrating portion 1b is made different, and the concave portion 3 of each vibrating portion 1b. The same position and shape are formed on both sides.
  • one or two vibrating portions 1b having an appropriate side surface shape and the shape and position of the concave portion 3 are coupled to the pedestal portion 1a having a substantially rectangular shape in plan view. Can do.
  • the piezoelectric diaphragm 11 of this embodiment is characterized in that, for example, four divided vibration parts 11b to 11e are coupled around a circular pedestal part 11a in plan view, and the pedestal part 11a and each of the vibration parts 11b to 11e are coupled. It is in the point which provided the recessed part 3 in the coupling line K part. That is, as shown in FIGS. 4 and 5, four planar fan-shaped vibrating portions 11b to 11e are coupled to the circular pedestal portion 11a via the coupling line K. On the side surfaces of the vibrating portions 11b to 11e of the coupling lines K of the 11b to 11e and the pedestal portion 11a, notched concave portions 3 (suppression interference preventing means) directed inward are provided.
  • the vibrating portions 11b to 11e have two steps 12 whose thickness becomes thinner toward the outer periphery, and the side surfaces of the vibrating portions 11b to 11e are connected to each other with a very small gap 13. Yes. Also in this piezoelectric diaphragm 11, the free vibration region R shown in FIG. 4 is formed by the recess 3, and the same effect as the piezoelectric diaphragm 1 of the first embodiment can be obtained.
  • FIG. 6 shows a modification of the piezoelectric diaphragm 11 of the second embodiment.
  • the piezoelectric diaphragm 11 shown in FIG. 6A is obtained by forming the side surfaces of the vibration parts 11b to 11g divided into six into various corrugated shapes having a straight part 14 and a curved part 15.
  • the piezoelectric diaphragm 11 shown in FIG. 6B has different positions and depths of the concave portions 3 provided on both side surfaces of the four vibration portions 11b to 11e, and the side surfaces of the vibration portions 11b to 11e. They are connected with a relatively large gap 16. Further, the piezoelectric diaphragm 11 shown in FIG.
  • each piezoelectric diaphragm 11 shown in FIG. 6 is an example in which the thickness of the vibrating portions 11b to 11g is uniform. However, as shown in FIG. It is also good.
  • the piezoelectric diaphragm 21 of this embodiment is characterized in that four or six vibrating portions 21b to 21g are coupled in an eccentric state to a circular pedestal portion 21a in plan view, and the pedestal portion 21a and each vibrating portion 21b.
  • a concave portion 3 is provided in the portion of the connecting line K of 21 g. That is, the piezoelectric diaphragm 21 shown in FIG. 7A has a circular outer shape by eccentrically coupling the four vibrating parts 21b to 21e having a uniform thickness to the circular base part 21a via the coupling line K.
  • a notch-like recess 3 is provided in the connecting line K portion of the pedestal 21a and the vibrating portions 21b to 21e.
  • the piezoelectric diaphragm 21 shown in FIG. 7B is obtained by providing four steps 22 on the four vibrating portions 21b to 21e in the piezoelectric diaphragm 21 shown in FIG. 7A.
  • the piezoelectric diaphragm 21 shown in FIG. 7C has six oscillating portions 21b to 21b having a radius that gradually decreases via a coupling line K and two steps 22 on a circular pedestal portion 21a. 21 g is eccentrically coupled.
  • the piezoelectric diaphragm 21 shown in FIG. 7D is obtained by eccentrically coupling six vibrating portions 21b to 21g having a gradually decreasing radius, a uniform thickness, and different side shapes.
  • the notch-shaped recesses 3 are provided in the pedestal portion 21 a and the coupling line K portion of the vibrating portions 21 b to 21 g, respectively. It has been.
  • FIG. 8 shows a modification of the third embodiment, which is characterized in that the concave portion 3 is formed by a curve as in the piezoelectric diaphragm 11 shown in FIG. 6 (c). That is, in the piezoelectric diaphragm 21 shown in FIG. 8A, among the six vibrating parts 21b to 21g having a uniform thickness and a gradually decreasing radius, five vibrating parts 21b to 21f having a large radius are connected.
  • the recesses 3 are formed by making the ends on the pedestal 21a side of the both side surfaces into a curve (parabola) having a relatively large curvature, and the side surfaces where the two oscillating portions 21f and 21g having a small radius are connected are formed in a straight line. Thus, the recess 3 is formed so as not to be provided.
  • the piezoelectric diaphragm 21 shown in FIG. 8B has a small curvature on both side surfaces of the end portions on the pedestal 21a side of each of the six vibrating sections 21b to 21g in which the radius having two steps 22 gradually decreases.
  • the concave portions 3 are respectively formed in the connecting line K portions of the vibrating portions 21b to 21g and the pedestal portion 21a.
  • the piezoelectric diaphragm 21 shown in FIG. 8C has a concave portion by curving ends on the side of the pedestal portion 21a on both sides of the four vibration portions 21b to 21e that are eccentrically coupled to the circular pedestal portion 21a.
  • the piezoelectric diaphragm 21 shown in FIG. 8 (d) has a concave shape with the side surfaces of the two vibrating portions 21d and 21e connected to each other being linear in the piezoelectric diaphragm 21 shown in FIG. 8 (c). 3 is not provided.
  • the piezoelectric diaphragm 31 shown in FIG. 9 has a pedestal portion 31a formed in a rectangular shape in plan view, and has eight vibration portions 31b to 31i coupled to the periphery of the pedestal portion 31a and linearly connected to the vibration portions 31b to 31i.
  • a notch-like recess 3 made of, a recess 3 made of a curve, a recess 3 having a combination of a straight line and a curve, and a recess 3 made of a parabola or the like are provided in the connecting line K. Further, in the piezoelectric diaphragm 31 shown in FIG.
  • the shape of the pedestal portion 31a is formed in a triangular shape in plan view, and a notch shape is formed in the coupling line K portion of the pedestal portion 31a and the three vibration portions 31b to 31d.
  • the piezoelectric diaphragm 31 shown in FIG. 10 (b) is coupled with the three oscillating portions 31b to 31d via the curved concave portion 3 to the triangular base portion 31a in plan view. It has been made.
  • the piezoelectric diaphragm 31 shown in FIG. 11A is obtained by coupling six vibrating portions 31b to 31g to a hexagonal pedestal portion 31a in plan view, and to the pedestal portion 31a of each vibrating portion 31b to 31g. Are provided with notch-like recesses 3 in the connecting line K.
  • the piezoelectric diaphragm 31 shown in FIG. 11B has eight oscillating parts 31b to 31i coupled to the base part 31a having an octagonal shape in plan view with the notch-shaped recesses 3 and each oscillating part.
  • the concave portions 3 of 31b to 31i have different shapes. According to this embodiment, various shapes such as a triangle, a quadrangle, or a polygon can be used as the shape of the pedestal portion 31a.
  • FIG. 12 shows a fifth embodiment of the piezoelectric diaphragm according to the present invention.
  • the piezoelectric diaphragm 41 of this embodiment is characterized in that the pedestal portion 41a is formed in a triangular shape in plan view, the side surfaces of the three vibrating portions 41b to 41d are parabolic, and the coupling line K portion of one vibrating portion 41b Are provided with notch-like recesses 3 on both side surfaces.
  • the concave portion 3 made of a curve is provided in the coupling line K portion of the other two vibrating portions 41c and 41d, and the rising position of the vibrating portion 41d with respect to the coupling line K of the pedestal portion 41a is the other vibrating portions 41b and 41c. Is set differently.
  • both side surfaces of each of the vibration parts 41b to 41c are completely separated, and a predetermined vibration region R formed by the recess 3 or a parabolic shape or the like is used. Suppression interference of the vibration parts 41b to 41d is prevented.
  • FIGS. 13 to 16 show a sixth embodiment of a piezoelectric diaphragm according to the present invention and its modification.
  • a feature of the piezoelectric diaphragm 51 of this embodiment is that a groove-like recess 53 serving as a suppression interference prevention means is provided on the surface of each of the vibration parts 51b to 51e at the coupling line K between the base part 51a and the vibration parts 51b to 51e.
  • a groove-like recess 53 serving as a suppression interference prevention means is provided on the surface of each of the vibration parts 51b to 51e at the coupling line K between the base part 51a and the vibration parts 51b to 51e.
  • FIGS. 13 and 14 four vibrating parts 51b to 51e having two steps 52 are coupled to a circular pedestal part 51a in plan view, and the pedestal part 51a side of each of the vibrating parts 51b to 51e is connected.
  • recesses 53 are respectively formed at both ends of the coupling line K portion. With this recess 53, free vibration regions R are formed on both side surfaces of each of the vibration portions 51b to 51e, and it is possible to obtain the same effect as the piezoelectric diaphragm 11 provided with the notch-shaped recess 3 described above. .
  • FIG. 15 and 16 show a modification of this embodiment, and FIG. 15 shows that the concave portion 53 has a uniform thickness (or a tapered shape in which the outer peripheral side is thin as shown by a two-dot chain line in FIG. 15). They are respectively provided on both the front and back sides of the coupling line K of the vibration parts 51b to 51e. Further, in the sixth embodiment, the position where the groove-like recess 53 is formed is not limited to the surface or front and back surfaces of the vibration parts 51b to 51e, but as shown in FIG. 16 (a), the vibration parts 51b to 51e are formed.
  • the groove-like recess 53 provided in the coupling line K can be provided in an appropriate form at an appropriate position depending on the form of the pedestal 51a and the vibrating parts 51b to 51e.
  • the piezoelectric body 4 is firmly fixed to the surface.
  • the recesses 3 and 53 serving as suppression interference preventing means for preventing the suppression interference of the vibration part are formed on a connecting line K portion between the base part to be connected and the vibration part integrally connected to the base part by integral molding or the like.
  • the free vibration region R can be formed on both side surfaces of the vibration portion by the concave portions 3 and 53, and the free vibration region R can reduce the suppression interference generated in the coupling line K portion between the base portion and the vibration portion. Therefore, it is possible to obtain the piezoelectric diaphragm 1 or the like having a beautiful reproduced sound.
  • the concave portions 3 and 53 as suppression interference preventing means are formed in a curved shape on the side surface of the notch-shaped concave portion 3 and the vibration portion provided by cutting the side surface of the vibration portion of the coupling line K in the thickness direction. Therefore, the suppression interference preventing means can be easily formed in the coupling line K portion, and the piezoelectric interference can be reduced. The cost increase of the diaphragm 1 etc. can be suppressed.
  • the shape and position of the recesses 3 and 53 are set in accordance with the elastic modulus of the vibration part, or the shape of the recesses 3 and 53 itself is a straight line, a curve, or a combination thereof, By means of the recesses 3 and 53 corresponding to the shape of the part, the suppression interference of the vibration part can be effectively reduced.
  • the thickness of the vibration part is uniform or formed in a stepped shape or a taper shape
  • the vibration part is coupled to the pedestal part by one or more
  • the pedestal part is a circle, an ellipse, Since it is formed in a triangular, square, or polygonal shape, it can be applied to piezoelectric diaphragms having various thickness shapes and various numbers of vibration parts, and various pedestal-shaped piezoelectric diaphragms, and can be used for various piezoelectric speakers. Further, the versatility of the piezoelectric diaphragm 1 and the like can be improved.
  • the side surface of the vibration part is formed in a shape including a straight line or a parabola extending outward from a predetermined position of the outer peripheral line of the pedestal part in a plan view, or a combination of these, the vibration part of various side shapes Can be applied to the piezoelectric diaphragm 1 having the above, and the versatility can be further improved.
  • FIGS. 17 to 29 show seventh to ninth embodiments according to the present invention.
  • 17 to 22 show the seventh embodiment, in which FIG. 17 is a plan view, FIG. 18 is a cross-sectional view taken along line EE of FIG. 17, FIG. 19 is an enlarged plan view of a coupling portion, and FIG. 22 are a plan view and an explanatory view showing a modification.
  • the piezoelectric diaphragm 101 has a circular outer peripheral shape, and is integrally coupled to the pedestal portion 102 having a circular shape in plan view and a coupling line K (coupling portion) to the pedestal portion 102.
  • a plurality of (six in the figure) vibrating portions 103a to 103f are respectively divided by dividing lines 104 extending radially from the coupling line K toward the outer periphery.
  • the pedestal portion 102 is formed to have a plate thickness that is greater than the plate thickness of the vibrating portions 103a to 103f, and the back surface of the pedestal portion 102 and the back surface of the vibrating portion 103 are substantially flush with each other. It is formed by.
  • the coupling line K that couples the base portion 102 and the vibrating portions 103a to 103f has a width as a suppression interference preventing means formed by notching a predetermined depth on the front surface and the back surface.
  • a groove 105 having a depth of h3 and h4 at w3 is provided.
  • the groove 105 is formed in an annular shape on the outer peripheral portion of the circular pedestal portion 102, and the dividing lines 104 of the vibrating portions 103a to 103f extend from the groove 105 in the outer peripheral direction.
  • each dividing line 104 is formed by a straight line 104a, the ends of the pair of adjacent dividing lines 104 facing each other with a predetermined dimension are opposed to each other, and the outer peripheral side of the pair of adjacent dividing lines 104 The end portions are set so as to face each other or substantially contact with a very small gap.
  • a substantially wedge-shaped gap 106 is formed between a pair of adjacent dividing lines 104 in plan view, and each dividing line 104 is continuously extended in the outer circumferential direction from the groove 105 as the suppression interference preventing means. It is in a state.
  • the piezoelectric diaphragm 101 when an electrical signal is applied to the piezoelectric body 107 (see FIG. 18) that is closely fixed to the surface of the pedestal portion 102, the piezoelectric body 107 is distorted, and this distortion is caused by the pedestal portion. It is propagated to each of the vibration parts 103a to 103f via 102 and converted into acoustic vibration by the vibration parts 103a to 103f.
  • the grooves 105 are respectively formed on the front and back surfaces of the coupling line K between the pedestal portion 102 and the vibration portions 103a to 103f, the opening edge corners and the like of the groove 105 become free vibration regions, and as a result, In particular, the suppression interference in the coupling line K portion, which is likely to occur when a large electrical signal is applied to the piezoelectric body 107, does not reach the free vibration region, and the suppression interference in the coupling line K portion is prevented.
  • the dividing lines 104 of the vibrating portions 103a to 103f are continuously extended from the both ends in the longitudinal direction of the groove 105 in the outer peripheral direction, the vibration in which the suppression interference is prevented by the groove 105 is generated. Propagated well to each of the vibrating portions 103a to 103f. This vibration propagates well toward the outer periphery of each of the vibrating portions 103a to 103f having the dividing line 104, that is, the vibration is smoothly transmitted from the pedestal portion 102 to the outer periphery of each of the vibrating portions 103a to 103f. It will be.
  • the piezoelectric body 107 is formed by forming a piezoelectric ceramic into a disk shape, but is not limited to this.
  • a vibration using a voice coil drive type vibration speaker or a super magnetostrictive element is used.
  • Appropriate vibration means capable of applying vibration to the pedestal 102 of the piezoelectric diaphragm 1 such as a speaker can be employed.
  • the grooves 105 having substantially the same depths h3, h4 and width w3 are formed on the front and back surfaces of the coupling line K.
  • the width and depth of the groove 105 may be different on the front and back surfaces.
  • the groove 105 may be provided only on the front surface side (or the back surface side). Further, in the above description, the groove 105 is provided in an annular shape in the entire outer periphery of the pedestal portion 102. However, for example, the groove 105 is provided only in the coupling line K with each of the vibrating portions 103a to 103f and provided in the gap 106 portion. It can also be set as the structure which is not. The same applies to the piezoelectric diaphragms of the respective embodiments described above and the modifications described later.
  • FIG. 20 (a) is formed by a curved line 104b that is recessed inward, and FIG. It is formed by a curved line 104c bulging outward.
  • a substantially wedge-shaped gap 106 is formed between the adjacent dividing lines 104 in plan view.
  • the piezoelectric diaphragm 101 shown in FIG. 21 is formed by forming the dividing line 104 with a parabola 104d bulging outward. That is, for example, as shown in FIG. 22, a parabola formed by the focal point F and the quasi-line L, for example, between P0 and P1 is used as the dividing line 104. A gap 106 is also formed between the adjacent dividing lines 104 by this dividing line 104.
  • the parabola 104d bulging outward is used, but a parabola concave inward can be used, and the shape of the parabola 104d is not limited to P0 and P1 of the parabola shown in FIG. For example, between P1 and P2 can be used, or any other suitable parabola can be used.
  • the piezoelectric diaphragm 111 of this embodiment is characterized in that the length of the dividing line 104 composed of a straight line 104a that is the diameter of a plurality of (four in the figure) vibrating portions 103a to 103d is the longest.
  • the pedestal portion 102 having a circular shape in plan view is provided to be eccentric from the center position of the piezoelectric diaphragm 111 having a circular outer peripheral shape, and the vibrating portions 103a and 103d and the vibrating portion are set by gradually shortening from the portion along the left and right outer periphery.
  • 103b and 103c are formed in a symmetrical shape.
  • each dividing line 104 formed of a straight line 104a extends radially from the coupling line K in which the groove 105 is formed, and a gap 106 is formed between the adjacent dividing lines 104.
  • the same effects as those of the piezoelectric diaphragm 101 of the seventh embodiment can be obtained.
  • the piezoelectric diaphragm 111 of the eighth embodiment since the areas of the vibrating parts 103 to 103d are different, the elastic moduli of the vibrating parts 103a to 103d are set to be different.
  • the shape of the dividing line 104 is not limited to the straight line 104a, and all the dividing lines 104 are curved inwardly as shown in FIG. As shown in FIG. 25B, the curve 104c bulging outward, all the dividing lines 104 are formed as appropriate parabolas 104d, or as shown in FIG. 104b and 104c and the parabola 104d can be used in appropriate combination.
  • the piezoelectric diaphragm 111 shown in FIG. 24A a plurality of (three in the figure) steps 108 are provided so that the thickness of the vibrating portions 103a to 103d decreases in order toward the outer periphery.
  • the step 108 can also be applied to the piezoelectric diaphragms of the embodiments and modifications thereof.
  • the outer peripheral shape is not limited to a perfect circle, and may be formed in an elliptical shape.
  • the center O1 of the pedestal portion 102 having a circular shape in plan view passes through the center O2 of the piezoelectric diaphragm 111 having a circular shape in plan view.
  • the vibrating parts 103a and 103d and the vibrating parts 103b and 103c are symmetrically positioned on the center line CL.
  • the present invention is not limited to this form.
  • the center O1 of the pedestal part 102 is used.
  • the piezoelectric diaphragm 121 of this embodiment is characterized in that the length of the dividing line 104 composed of the straight lines 104a of a plurality (five in the figure) of the vibrating parts 103a to 103e is the longest part and the shortest part. Is gradually changed so as to have a predetermined depression angle, and the outer shape of the piezoelectric diaphragm 121 is not a circle but an irregular shape.
  • the piezoelectric diaphragm 121 of this embodiment is set so that the elastic modulus of each of the vibrating portions 103a to 103e is different.
  • the dividing line 104 is not limited to the straight line 104a, and all the dividing lines 104 are inwardly curved as shown in FIG. As shown in b), the curve 104c bulges outward, all the dividing lines 104 are formed as appropriate parabolas 104d, or as shown in FIG. 28, the dividing lines 104 are straight lines 104a and curves 104b, 104c.
  • the parabola 104d can be used in appropriate combination.
  • the same operational effects as those of the piezoelectric diaphragm 101 of the seventh embodiment can be obtained.
  • a feature of the piezoelectric diaphragm 101 of the tenth embodiment shown in FIG. 30 is that the outer peripheral shape of the four vibrating portions 103a to 103d divided by the dividing line 104, that is, the outer shape of the piezoelectric diaphragm 101 is determined from the center line CL.
  • the shape is such that approximately half of the circle of the center O3 eccentric to the left side and approximately half of the circle of the center O4 eccentric to the right side from the center line CL are combined.
  • the piezoelectric diaphragm 101 of the eleventh embodiment shown in FIG. 31 is characterized in that the shape of the tip of the dividing line 104 (referred to as the dividing edge 110) of the four vibrating parts 103a to 103d is in plan view.
  • the curved line or the straight line does not have a sharp shape intersecting at an acute angle in a plan view, but is formed in a plan view curved shape. That is, the dividing edge portion 110 of the dividing line 104 composed of the straight line 104a, the curves 104b and 104c, or the parabola 104d is enlarged in a two-dot chain line a to have an elliptical shape or a parabolic curved shape in plan view. As shown in an enlarged view by a two-dot chain line b, a circular curved shape is obtained in plan view.
  • all the dividing edges 110 of the dividing lines 104 of the vibrating parts 103a to 103d have a curved shape in plan view.
  • a planar view curve shape may be used, and the other part may be an acute angle shape. With this configuration, it is sufficient to process only the necessary divided edge portion 110 into a curved shape, and it is possible to easily obtain desired vibration characteristics and obtain a piezoelectric diaphragm 101 that is advantageous in terms of cost.
  • the configuration in which the divided edge portion 110 is formed in a curved shape in plan view is not limited to the piezoelectric diaphragm 101 of the embodiment shown in FIG. 31, and for example, as shown in FIG. 32, the piezoelectric of the ninth embodiment is used. It can also be applied to the diaphragm 121. That is, as shown in FIGS. 32 (a) and 32 (b), the dividing edge portion 110 of the dividing line 104 of each of the vibrating portions 103a to 103f is formed in a curved shape in plan view. Also in this case, all the divided edge portions 110 may be formed in a planar view curve shape, or a part of the divided edge portions 110 may be formed in a plan view curve shape.
  • the coupling line K between the pedestal portion 102 and the vibrating portions 103a to 103g is provided.
  • a groove 105 is provided as a suppression interference prevention means, and the dividing line 104 extends radially from the groove 105. Therefore, the groove 105 causes a coupling line K portion between the base portion 102 and the vibrating portions 103a to 103g.
  • the suppression interference can be reduced, and the vibration with the suppression interference reduced can be smoothly propagated along the dividing line 104 from the longitudinal end of the groove 105 to the outer periphery of each of the vibration parts 103a to 103g. It is possible to obtain the piezoelectric diaphragm 101 and the like having a beautiful reproduced sound.
  • each vibration part is formed in a curved shape in plan view, generation of high-frequency vibrations at the dividing edge 110 can be suppressed, and a more beautiful and clear reproduction sound can be generated on the piezoelectric diaphragm. Can be obtained.
  • the suppression interference preventing means is the groove 105 formed in at least one of the front surface or the back surface of the coupling line K portion of the pedestal portion 102 and each of the vibration portions 103a to 103g, the form of each of the vibration portions 103a to 103g, etc. Accordingly, by setting the depths h3 and h4 and the width w3 of the groove 105 to predetermined values, it is possible to reliably suppress the suppression interference, and it is possible to easily form the suppression interference prevention means in the coupling line K portion. Thus, an increase in cost of the piezoelectric diaphragm 101 and the like can be suppressed.
  • the pedestal The vibration of the part 102 can be more smoothly propagated to the outer peripheral side of each of the vibration parts 103a to 103g. Further, if each of the vibration parts 103a to 103g is formed to have a step 108 having a different thickness, the vibration state of each of the vibration parts 103a to 103g can be changed by the step 108, and various types of piezoelectric speakers can be obtained. The versatility can be further improved.
  • each of the vibrating portions 103a to 103g is formed with a curve
  • the outer peripheral shape of the piezoelectric vibration plate 101 or the like is circular or elliptical.
  • FIG. As shown in FIG.
  • the shape of a part (or all) of the outer periphery of the vibrating portions 103d to 103f is not a circular arc (curve) but a straight line 109, various uneven curves including a parabola,
  • the piezoelectric diaphragm 101 having various outer shapes can be obtained and can be used for various piezoelectric speakers.
  • the dividing line 104 is formed by the straight line 104a, the curves 104b and 104c, and the parabola 104d that are continuous from the coupling line K to the outer periphery of each of the vibrating portions 103a to 103g.
  • a dividing line 104 having a shape in which straight lines and curves of various shapes are continuously used such as a dividing line 104 in which a curved line 104b that is recessed inward and a curved line 104c that is expanded outward is used.
  • the suppression interference preventing means is formed by providing the notched groove 105 continuously in the longitudinal direction in the coupling line K, but for example, the groove 105 is provided in a divided state in the longitudinal direction.
  • An appropriate configuration can be employed according to the form of the vibrating portions 103a to 103g, such as using a ridge instead of the groove 105, or using both the groove and the ridge.
  • the plate portions of the vibrating portions 103a to 103g are formed in the same flat plate shape in the entire region, or a plate is formed from the pedestal portion 2 side toward the outer periphery by the step 108.
  • the plate thickness of the vibrating portions 103a to 103g may be a tapered shape that continuously decreases from the base portion 2 side toward the outer periphery.
  • the shape of the pedestal portion 102 and the like in each of the seventh to eleventh embodiments is not limited to a circle. For example, as shown in FIG.
  • a pedestal portion 102 such as a polygonal shape such as a hexagon, a square shape, or a rectangular shape.
  • the overall shape of the piezoelectric diaphragm itself is not limited to the shape in which the outer peripheries of the vibrating parts 103a to 103g are substantially continuous.
  • it is applied to a piezoelectric diaphragm in which the outer peripheries of the vibrating parts 103a to 103g are not continuous. can do.
  • the form of the piezoelectric diaphragm, the shape of the pedestal, the shape of the recess and the groove, the shape and the number of the vibrating parts, etc. are the gist of each invention related to the present invention. Changes can be made as appropriate without departing from the scope.
  • the present invention can be used for all piezoelectric diaphragms having a pedestal portion to which a piezoelectric body is closely fixed and a vibration portion integrally coupled to the pedestal portion.
  • AA line arrow view of FIG. The top view which shows the modification example The top view which shows 2nd Embodiment of the piezoelectric diaphragm concerning this invention.
  • BB arrow view of Fig. 4 The top view which shows the modification example The top view which shows 3rd Embodiment of the piezoelectric diaphragm concerning this invention.
  • the top view which shows the modification example The top view which shows 4th Embodiment of the piezoelectric diaphragm concerning this invention.
  • the top view of the principal part which shows the modification example The top view of the principal part which shows the other modification same as the above
  • CC line arrow view of Fig. 13 (A) is a cross-sectional view similar to FIG. 14, and (b) is a cross-sectional view taken along the line DD of (a), showing a modification thereof.
  • Sectional drawing of the principal part which shows the other modification same as the above The top view which shows 7th Embodiment of the piezoelectric diaphragm which concerns on this invention.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)

Abstract

L'invention a pour objet une plaque de vibration piézoélectrique configurée pour réduire une interférence inhibitrice générée dans une partie de couplage entre une unité de base et une unité de vibration, de sorte à pouvoir obtenir de magnifiques sons reproduits. La plaque de vibration piézoélectrique selon l'invention est pourvue d'une unité de base sur la surface de laquelle un élément piézoélectrique est fixé étroitement et d'une unité de vibration qui est couplée d'un seul tenant à l'unité de base. La plaque de vibration piézoélectrique est caractérisée en ce qu'elle comprend un moyen de prévention d'interférence inhibitrice pour éviter une interférence inhibitrice de l'unité de vibration, au niveau d'une partie de couplage entre l'unité de base et l'unité de vibration. Le moyen de prévention d'interférence inhibitrice comporte une partie concave réalisée par la découpe d'une surface latérale de l'unité de vibration dans l'unité de couplage dans une direction d'épaisseur et une partie concave de type rainure réalisée sur une surface de l'unité de vibration, ou bien une unité concave par la formation dans la surface latérale de l'unité de vibration d'une courbe en vue plane. En outre, l'unité de vibration est divisée radialement en une pluralité de parties et les lignes de division sont réalisées de manière à atteindre une circonférence externe à partir du moyen de prévention d'interférence inhibitrice.
PCT/JP2008/003502 2008-01-21 2008-11-27 Plaque de vibration piézoélectrique WO2009093291A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2008010211 2008-01-21
JP2008-010211 2008-01-21
JP2008156603 2008-06-16
JP2008-156603 2008-06-16

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WO2009093291A1 true WO2009093291A1 (fr) 2009-07-30

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2597894A4 (fr) * 2010-07-23 2015-11-11 Nec Corp Dispositif à vibrations et dispositif électronique

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58114697U (ja) * 1982-01-28 1983-08-05 九州日立マクセル株式会社 圧電セラミツクトランスデユ−サ
JPH02266799A (ja) * 1989-04-07 1990-10-31 Nec Corp 圧電振動板
JP2000253479A (ja) * 1999-02-26 2000-09-14 Mitsubishi Electric Engineering Co Ltd 超音波振動素子
JP2002232263A (ja) * 2001-02-06 2002-08-16 Toyo Commun Equip Co Ltd 縦続接続型二重モード圧電フィルタ
JP2003348692A (ja) * 2002-05-27 2003-12-05 Ensaa Kk 圧電シートの製造方法、圧電シート、圧電スピーカ及びスピーカシステム
JP3799001B2 (ja) * 2001-09-10 2006-07-19 富士彦 小林 圧電スピーカ
WO2007083497A1 (fr) * 2005-12-27 2007-07-26 Nec Corporation Actionneur piézoélectrique et composant électronique

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58114697U (ja) * 1982-01-28 1983-08-05 九州日立マクセル株式会社 圧電セラミツクトランスデユ−サ
JPH02266799A (ja) * 1989-04-07 1990-10-31 Nec Corp 圧電振動板
JP2000253479A (ja) * 1999-02-26 2000-09-14 Mitsubishi Electric Engineering Co Ltd 超音波振動素子
JP2002232263A (ja) * 2001-02-06 2002-08-16 Toyo Commun Equip Co Ltd 縦続接続型二重モード圧電フィルタ
JP3799001B2 (ja) * 2001-09-10 2006-07-19 富士彦 小林 圧電スピーカ
JP2003348692A (ja) * 2002-05-27 2003-12-05 Ensaa Kk 圧電シートの製造方法、圧電シート、圧電スピーカ及びスピーカシステム
WO2007083497A1 (fr) * 2005-12-27 2007-07-26 Nec Corporation Actionneur piézoélectrique et composant électronique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2597894A4 (fr) * 2010-07-23 2015-11-11 Nec Corp Dispositif à vibrations et dispositif électronique

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