JP2006023250A - Piezoelectric vibration detecting/restraining device with controlled thickness of adhesive layer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piezoelectric vibration detecting/restraining device avoiding a difference in operational performance caused by a deviation in the thickness of an adhesive layer, when installing a piezoelectric element on a vibration detecting or restraining surface by an adhesive. <P>SOLUTION: In this device, the adhesive layer is separately arranged in both end parts and a central part of the piezoelectric element along a curve of a surface by vibration of an object, or a space between the piezoelectric element and an object surface is filled with the adhesive layer by separately placing the piezoelectric element from the object surface by a spacer for limiting the thickness of the adhesive layer, or a laminated body of placing an electric circuit on the piezoelectric element is installed on the object surface by a cover member, and the adhesive layer is arranged by a distance between an inner surface of the cover member and a flange surface abutting on the object surface and the thickness corresponding to a difference in the thickness of the laminated body. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a piezoelectric vibration detection / suppression device that detects or suppresses vibration of an object by a piezoelectric element.

When a piezoelectric plate or block is subjected to expansion / contraction force, a potential difference is generated between the opposing surfaces, and conversely, when a potential difference is applied between the opposing surfaces, the piezoelectric element is made to expand and contract. Attached to the surface of an object where vibration of the vehicle body, transmission, etc. is a problem with an adhesive, a pair of electrodes is added to this to electrically detect the vibration of the object, or to electrically suppress the vibration of the object It is considered. Invention proposals relating to such technology are described in, for example, the following Patent Documents 1, 2, and 3.
JP 2001-127354 A JP-A-5-133435 Japanese Utility Model Publication No. 6-32787

  In Patent Document 1 described above, in order to suppress deterioration and variation of the adhesive layer for attaching the piezoelectric layer to the surface of the object, and to simplify the manufacturing process, amino acids that can be induced on the object to the same crystal structure as the piezoelectric material are disclosed. It has been proposed to form a thin film layer formed from a salt of a polycarboxylic acid metal complex and an amine, and to bond the object and the piezoelectric layer via the thin film layer. In the above Patent Document 2, the vibration level of the object is always kept at a low level even when the excitation frequency of the vibration input to the object changes, and the lowest vibration level with respect to the excitation frequency of the input vibration to the object. In order to control the change to the natural vibration frequency, the piezoelectric element is attached to the object, and a voltage that gives a vibration level lower than the vibration frequency of the vibration input to the object is applied to the piezoelectric element. By applying internal tensile force or internal compressive force to the object by the element, the natural vibration frequency of the object is changed, and the applied voltage to the piezoelectric element is determined based on the vibration level characteristic data measured in advance using the applied voltage as a parameter. Control by vibration frequency control means has been proposed. In the above-mentioned Patent Document 3, the vibration of the engine is detected by a vibration sensor in order to provide a vibration reduction device having a large vibration reduction effect in the transmission of an automobile with a structure that is lightweight and does not interfere with maintenance of the transmission. It has been proposed that a piezoelectric element is fixed to a flywheel housing between an engine and a transmission, and the piezoelectric element is controlled by a controller based on a detection value of a vibration sensor.

  The invention of the above-mentioned Patent Document 1 uses a salt of a special metal complex and an amine as an adhesive material. However, the invention is not limited to this. Conventionally, in general, a piezoelectric material plate or a piezoelectric material plate constituting a piezoelectric vibration detection / suppression device is used. The piezoelectric element composed of blocks is attached to the surface of an object whose vibration is to be detected or an object whose vibration is to be suppressed by some kind of adhesive. In this case, the adhesive material forms a single layer, and no matter how thin it is, it is completely free from deformation. On the other hand, since the deformation of the piezoelectric element due to the piezoelectric function is extremely small, the operating characteristics of the piezoelectric vibration detection / suppression device in which the piezoelectric element is attached to the surface of the object with an adhesive material are significantly affected by the thickness of the adhesive layer It is thought to receive.

  That is, even if a certain piezoelectric element 100 is attached to the surface of the object 102 with a certain amount of adhesive 104 as shown in FIG. 10, for example, in three cases as shown in FIGS. The thickness of the adhesive layer is different, and it is considered that there is a difference in operating performance as a piezoelectric vibration detection / suppression device.

  Further, in general, the attachment of the piezoelectric element to the object surface with the adhesive is performed by so-called sticking in which the adhesive is applied to the entire surface of the piezoelectric element facing the object surface. In order to avoid a difference in operating performance of the piezoelectric vibration detection / suppression device due to a change in the thickness of the material layer, for example, as shown in FIG. 11A, the expansion and contraction of the piezoelectric element 100 is influenced by the adhesive material layer 106 as much as possible. It is conceivable that only both ends of the piezoelectric element 100 are fixed to the object surface with an adhesive so as to cope with the deformation caused by vibration of the object 102. However, in this case, with respect to the curved deformation of the object surface as shown in FIG. 11B, there arises a problem that the expansion and contraction of the piezoelectric element does not correspond to the deformation of the object surface.

  The present invention has been made in view of the above-mentioned problems related to attaching a piezoelectric element with an adhesive to the surface of an object whose vibration is to be detected or suppressed, and an improved piezoelectric vibration detecting / suppressing device in this respect. It is an issue to provide.

  In order to solve the above problems, the present invention provides a piezoelectric element having a piezoelectric material layer and a counter electrode, and an adhesive layer for attaching the piezoelectric element to the surface of an object to be subjected to vibration detection or suppression. In the piezoelectric vibration detecting / suppressing device, the adhesive layer is provided separately at both ends and a central portion of the piezoelectric element along the curvature of the surface due to the vibration of the object. A piezoelectric vibration detection / suppression device is proposed.

  In the piezoelectric vibration detecting / suppressing device as described above, the piezoelectric element has a substantially quadrangular planar outline, and the adhesive layers at both ends are on opposite sides of the substantially quadrangular planar outline. The adhesive layer in the central portion may be provided in a zone extending substantially parallel to both sides at an intermediate position between the two sides.

  Alternatively, in the piezoelectric vibration detecting / suppressing apparatus as described above, the adhesive layer at both ends is provided as an adhesive layer scattered in opposite end regions of the planar contour of the piezoelectric element. The center adhesive layer may be provided as an adhesive layer interspersed in the middle region of the both end regions. In this case, the planar contour of the piezoelectric element is substantially quadrangular, and the adhesive layers scattered in the both end regions are at least spaced along each opposite end of the substantially quadrangular planar contour. The adhesive layer including two interspersed adhesive layers, the adhesive layer interspersed in the intermediate region may include at least one interspersed adhesive layer located in the middle of the both ends, or the piezoelectric layer The planar outline of the element is substantially quadrangular, and the adhesive layers scattered in the both end regions are a pair of dotted bonds that are biased to the same side along each of opposite opposing ends of the substantially rectangular planar outline. The adhesive layer scattered in the intermediate region includes one interspersed adhesive layer that is biased to the opposite side to the interstitial adhesive layer at both ends in the middle of the both end portions. You may go out.

  Furthermore, in order to solve the above problems, the present invention provides a piezoelectric element having a piezoelectric material layer and a counter electrode, and an adhesive for attaching the piezoelectric element to the surface of an object to be subjected to vibration detection or suppression. A piezoelectric vibration detecting / suppressing device including a material layer, wherein the piezoelectric element is separated from the surface of the object by a spacer that limits a thickness of the adhesive layer, and the adhesive layer is separated by the spacer. The present invention also proposes a piezoelectric vibration detecting / suppressing device provided to fill a space between the placed piezoelectric element and the surface of the object. In this case, the spacer extends along the periphery of the piezoelectric element except for two small gaps facing each other in the planar outline, and the adhesive layer includes the piezoelectric element, the surface of the object, and the spacer. May be formed of an adhesive press-fitted into the space from one of the gaps. Alternatively, the piezoelectric element is separated from the surface of the object by a protrusion that limits the thickness of an adhesive layer formed on a part of the piezoelectric element, and the adhesive layer is spaced by the protrusion. It may be provided so as to fill a space between the surface of the piezoelectric element and the surface of the object.

  Furthermore, in order to solve the above problems, the present invention provides a piezoelectric element having a piezoelectric material layer and a counter electrode, and an adhesive for attaching the piezoelectric element to the surface of an object to be subjected to vibration detection or suppression. A piezoelectric vibration detecting / suppressing device including a material layer, wherein the piezoelectric element is attached to the surface of the object by a cover member in a state in which an electric circuit electrically combined with the piezoelectric element is laminated thereon And a thickness corresponding to a difference between a distance between an inner surface of the cover member that presses down the electric circuit and a flange surface that contacts the surface of the object and a thickness formed by the laminate of the piezoelectric element and the electric circuit. The present invention also proposes a piezoelectric vibration detection / suppression device provided with the adhesive layer. In this case, the cover member has a surface portion that is spaced apart from the surface of the object inside the flange surface and faces the surface of the object, and is provided between the separation surface portion and the surface of the object. It may be fixed to the surface of the object by the adhesive layer. Further, the flange surface of the cover member is extended along the peripheral edge except for the two small gap portions opposed to each other in the planar outline of the piezoelectric element, and the adhesive layer is formed by the piezoelectric element, the surface of the object, and the surface of the object. It may be formed by an adhesive material press-fitted into the space from one of the small gap portions in a space that is spaced apart from the object surface of the flange surface and surrounded by a surface portion that faces the object surface. Alternatively, the piezoelectric element is attached to the surface of the object by a cover member in a state where an electric circuit electrically combined with the piezoelectric element is placed thereon, and the cover member is attached to the surface of the object. A flange surface abutting on the surface, and a surface portion that is spaced from the surface of the object and faces the surface of the object inside the flange surface, between the surface portion and the flange surface that abuts the surface of the object The adhesive layer may be provided with a thickness corresponding to the difference between the distance and the thickness of the piezoelectric element.

  Piezoelectric vibration detection / suppression device comprising a piezoelectric element having a piezoelectric material layer and a counter electrode as described above, and an adhesive layer for attaching the piezoelectric element to the surface of an object to be subjected to vibration detection or suppression In this case, if the adhesive layer is provided separately at both ends and the center of the piezoelectric element along the curvature of the surface due to the vibration of the object, the expansion and contraction of the piezoelectric element is influenced by the adhesive layer as much as possible. Without reducing the construction area of the adhesive so as to cope with the deformation caused by the vibration of the object, the expansion and contraction of the piezoelectric element can correspond to the deformation of the object surface even with respect to the curved deformation of the object surface.

  In that case, when the piezoelectric element has a substantially quadrangular planar contour, adhesive layers at both ends are provided along opposite sides of the substantially quadrangular planar contour, If the adhesive layer is provided in a band extending substantially parallel to both sides at an intermediate position between the two sides, both end portions of the piezoelectric element required to make the deformation of the piezoelectric element correspond to the curved deformation of the object surface And the central part are fixed in a band-like region extending in the lateral direction at each position, and the expansion and contraction of the piezoelectric element is made to correspond to the deformation caused by the vibration of the object without being affected by the adhesive layer. Can be achieved effectively. In addition, the adhesive layer at the both end portions is provided as an adhesive layer interspersed with the opposite end region of the planar contour of the piezoelectric element, and the central adhesive layer is an intermediate region between the both end regions. If it is provided as an adhesive layer interspersed in the piezoelectric material, it is possible to achieve the expansion and contraction of the piezoelectric element corresponding to the curved deformation due to the vibration of the object surface with a minimum amount of adhesive, and the piezoelectric material corresponding to the curved deformation of the object surface. The influence of the adhesive layer on the deformation of the element can be minimized. In the case where the planar outline of the piezoelectric element is substantially quadrangular, the point of interspersing the adhesive layers is that at least two interspersed adhesive layers are provided along each of both end portions. By providing at least one interspersed adhesive layer in the middle, it is possible to obtain a high degree of stability in adapting the deformation of the piezoelectric element to the curved deformation of the object surface with the minimum interspersed adhesive layer. The adhesive layers scattered in the both end regions are a pair of scattered adhesive layers biased to the same side along each of the both end portions, and the adhesive layers scattered in the intermediate region are in the middle of both end portions If one scattered adhesive layer biased to the opposite side of the scattered adhesive layer at both ends is used, the minimum number of scattered adhesives can correspond to the deformation of the piezoelectric element with the curved deformation of the object surface. Can be done in layers. In any of the above cases, the space left between the piezoelectric element and the object surface by the band-like construction or the dotted construction of the adhesive layer is a so-called passive type in which a capacitor, inductance, or resistance is combined with the piezoelectric element. A capacitor, an inductance, and a resistor in the case of configuring the vibration damping device may be arranged.

  A piezoelectric vibration detecting / suppressing device including a piezoelectric element having a piezoelectric material layer and a counter electrode, and an adhesive layer for attaching the piezoelectric element to a surface of an object to be subjected to vibration detection or suppression. If the piezoelectric element is spaced from the object surface by a spacer that limits the thickness of the adhesive layer, and the adhesive layer is provided so as to fill a space between the piezoelectric element and the object surface between the spacers, By reliably managing the thickness of the adhesive layer, particularly the thickness of the adhesive layer at both ends along the curvature of the object surface due to vibration, to a predetermined value, the operation performance of the piezoelectric vibration detection / suppression device is expected. The performance can be stabilized. Further, in this case, the spacer is provided so as to extend along the peripheral edge except for the two small gap portions opposed to each other in the planar outline of the piezoelectric element, and the adhesive layer is surrounded by the piezoelectric element, the object surface, and the spacer. The thickness of the adhesive layer is a predetermined value if it is formed by the adhesive pressed into the space from the other small gap while discharging air from one of the small gaps to the space. Therefore, it is possible to efficiently manufacture a piezoelectric vibration detecting / suppressing device that is accurately controlled and has stable operation performance at a desired performance at low cost. The same applies to the case where a protrusion that limits the thickness of the adhesive layer is formed on a part of the piezoelectric element instead of the spacer.

  Alternatively, a piezoelectric vibration detection / suppression comprising a piezoelectric element having a layer of piezoelectric material and a counter electrode, and a layer of adhesive that attaches the piezoelectric element to the surface of the object to be subjected to vibration detection or suppression. In the apparatus, the piezoelectric element is attached to the object surface by a cover member in a state where an electric circuit electrically combined with the piezoelectric element is laminated thereon, and an inner surface for pressing the electric circuit of the cover member. If the adhesive layer is provided with a thickness corresponding to the difference between the distance between the flange surface contacting the object surface and the thickness of the laminate of the piezoelectric element and the electric circuit, the piezoelectric element and the electric circuit are provided in this way. Are combined with a cover member, and the adhesive layer is automatically finished to a layer having a predetermined thickness in the process of attaching this to the object surface with an adhesive. In this case, the cover member further has a surface portion that is spaced from the object surface inside the flange surface and faces the object surface, and the object is formed by an adhesive layer applied between the spaced surface portion and the object surface. If fixed to the surface, the process of assembling the piezoelectric element and the electric circuit to the object surface by the cover member and the process of bonding the piezoelectric element to the object surface by the adhesive layer having a predetermined thickness are executed as the same process. can do. Further, the flange surface of the cover member is extended along the peripheral edge except for two small gap portions facing each other in the planar contour of the piezoelectric element, and the adhesive layer is formed of the piezoelectric element, the object surface, and the object surface of the flange surface. A piezoelectric element is formed by a cover member as long as it is formed by an adhesive press-fitted into the space by one of the small gap portions in a space that is further spaced apart and surrounded by a surface portion facing the surface portion. And the process of assembling the electric circuit on the object surface and joining the piezoelectric element to the object surface with an adhesive layer having a predetermined thickness is further rationalized. In addition, the cover member has a flange surface that contacts the surface of the object, and a surface portion that is spaced from the surface of the object and that faces the surface of the object inside the flange surface, the surface portion and the surface of the object The same effect can be obtained even if the adhesive layer is provided with a thickness corresponding to the difference between the distance between the flange surface and the thickness of the piezoelectric element.

  FIG. 1 is an exploded sectional view showing a piezoelectric vibration detecting / suppressing device according to the present invention in one embodiment. This cross section is due to a cut surface in a direction along the curvature of the surface due to the vibration of the object to which the piezoelectric vibration detecting / suppressing device is attached. In the figure, a piezoelectric vibration detecting / suppressing device generally indicated by 10a includes a piezoelectric element 12 and adhesive layers 16-1, 16-2, 16-3 for attaching the piezoelectric element 12 to the surface of an object 14. The piezoelectric element 12 includes a piezoelectric material layer 18 and counter electrodes 20 and 22 provided on both sides thereof. The adhesive layer is divided into 16-1 and 16-2 provided at both ends of the piezoelectric element 12 and 16-3 provided at the center along the curvature of the surface of the object 14 due to vibration. ing.

  FIG. 2 is a plan view of the piezoelectric vibration detection / suppression device 10a shown in FIG. As can be seen from FIG. 2, the piezoelectric element 12 has a rectangular planar outline, and the adhesive layers 16-1 and 16-2 are provided along opposite sides of the rectangular planar outline. The layer 16-3 is provided in a band extending substantially parallel to both sides at an intermediate position between the both sides. In this way, the piezoelectric element 12 extends over the entire width in the lateral direction with respect to the direction along the curvature of the object surface due to the vibration of the object at the both ends and the center along the curvature of the surface. If the adhesive layers 16-1, 16-2, and 16-3 that extend are fixed to the object surface, the piezoelectric element 12 may not be fixed to the object surface by the adhesive layer over the entire surface. The deformation of the piezoelectric element can be made to correspond almost faithfully to the curvature of the object surface due to the vibration of the object.

  FIG. 3 is a plan view showing a piezoelectric vibration detecting / suppressing device 10b similar to that shown in FIG. 2 in which a part of the piezoelectric vibration detecting / suppressing device 10a shown in FIGS. 1 and 2 is changed. . In FIG. 3, the same reference numerals as in FIG. 2 are assigned to the portions corresponding to the portions shown in FIG. In this case, the adhesive layers are two interspersed adhesive layers 16-4, 16-5, 16-6 that are spaced apart to both edges along opposite ends of the rectangular planar contour of the piezoelectric element 12. , 16-7 and a dotted adhesive layer 16-8 located at the center of the middle region at both ends. According to such a scattered arrangement of the adhesive layers, high stability can be obtained when the deformation of the piezoelectric element is made to correspond to the curved deformation of the object surface with the minimum number of scattered adhesive layers.

  FIG. 4 is also a plan view showing a piezoelectric vibration detecting / suppressing device 10c similar to that shown in FIG. 2 in which a part of the piezoelectric vibration detecting / suppressing device 10a shown in FIGS. 1 and 2 is changed. is there. Also in FIG. 4, the same reference numerals as in FIG. 2 are assigned to portions corresponding to the portions shown in FIG. In this case, the adhesive layer is composed of a pair of interspersed adhesive layers 16-9 and 16-10 that are biased to the same side along each of opposite ends of the rectangular planar contour of the piezoelectric element 12, and an intermediate portion between the ends. It is provided as one interspersed adhesive layer 16-11 that is biased to the opposite side to the interspersed adhesive layer at both ends in the region. According to the dotted arrangement of the adhesive layers, it is possible to perform the deformation of the piezoelectric element corresponding to the curved deformation of the object surface with the minimum number of the dotted adhesive layers.

  FIG. 5 is an exploded sectional view similar to FIG. 1 showing the piezoelectric vibration detecting / suppressing device according to the present invention in another embodiment. This cross section is also due to a cut surface in a direction along the curvature of the surface due to the vibration of the object to which the piezoelectric vibration detecting / suppressing device is attached. FIG. 6 is a plan view of the piezoelectric vibration detection / suppression device shown in FIG. 5 and 6, the same reference numerals as those in FIGS. 1 and 2 are assigned to the portions corresponding to the portions shown in FIGS. 1 and 2. Also in this piezoelectric vibration detecting / suppressing device 10d, as can be seen from FIG. 6, the piezoelectric element 12 has a quadrangular planar outline, and the piezoelectric element 12 is bonded at both ends along the surface curvature due to the vibration of the object. Spacers 24-1 and 24-2 that limit the thickness of the material layer are separated from the surface 14 of the object, and the adhesive material layer 16-12 is a piezoelectric element between the spacers 24-1 and 24-2 and the surface of the object. It is provided to fill the space between. If the thickness of the adhesive layer is defined by the spacer in this way, the thickness of the adhesive layer, in particular, the thickness of the adhesive layer at both ends along the curvature of the object surface due to vibration can be reliably managed to a predetermined value. Thus, the operation performance of the piezoelectric vibration detection / suppression device can be stabilized to the expected performance.

  FIG. 7 is a plan view showing a piezoelectric vibration detecting / suppressing device 10e similar to that shown in FIG. 6 except that a part of the piezoelectric vibration detecting / suppressing device 10d shown in FIGS. 5 and 6 is changed. . Also in FIG. 7, the same reference numerals as in FIG. 6 are assigned to the portions corresponding to the portions shown in FIG. In this case, the spacer 24-3 extends along the peripheral edge except for the two small gap portions 26-1 and 26-2 that face each other in the rectangular planar outline of the piezoelectric element, and the adhesive layer 16-13 is Air is discharged from one of the small gap portions 26-1 and 26-2 into the space surrounded by the piezoelectric element 12, the surface of the object 14, and the spacer 24-3 and is pressed into the space from the other small gap portion. It is made of adhesive material. According to this point, the thickness of the adhesive layer is accurately controlled to a predetermined value by the spacer 24-3, and a piezoelectric vibration detecting / suppressing device whose operation performance is stable to the expected performance is efficiently manufactured at low cost. can do.

  FIG. 8 is a view similar to FIG. 5 showing an example in which protrusions 18-1 and 18-2 that limit the thickness of the adhesive layer are formed on a part of the piezoelectric element instead of the spacer. In this example, the protrusions 18-1 and 18-2 are formed by increasing the thickness of a part of the piezoelectric material layer 18. The protruding portion may be formed at the same position as the spacer shown in FIG. 6 or FIG.

  FIG. 9 is an exploded sectional view similar to FIGS. 1 and 5 showing the piezoelectric vibration detection / suppression device according to the present invention in still another embodiment. This cross section is also due to a cut surface in a direction along the curvature of the surface due to the vibration of the object to which the piezoelectric vibration detecting / suppressing device is attached. FIG. 10 is a cross-sectional plan view of the piezoelectric vibration detection / suppression device shown in FIG. 9 taken along section XX in FIG. 8 and 10, the same reference numerals as those in FIGS. 1 and 2 are assigned to the portions corresponding to the portions shown in FIGS. In this piezoelectric vibration detecting / suppressing device 10f, the piezoelectric element 12 is attached to the surface of the object 14 by the cover member 30 in a state where an electric circuit 28 electrically combined with the piezoelectric element is laminated thereon. The thickness of the cover member 30 corresponds to the difference between the distance between the inner surface 32 that presses down the electric circuit 28 and the flange surface 34 that contacts the object surface, and the thickness of the laminate of the piezoelectric element 12 and the electric circuit 28. An adhesive layer 16-14 is provided. According to such a structure, the adhesive material layer 16-14 is automatically formed into a layer having a predetermined thickness in the process of combining the piezoelectric element 12 and the electric circuit 28 with the cover member 30 and attaching this to the object surface with the adhesive material. Finished. Furthermore, the cover member has a surface portion 36 that is spaced apart from the object surface inside the flange surface and faces the object surface, and a layer of adhesive applied between the separation surface portion 36 and the object surface. If fixed to the object surface, the process of assembling the piezoelectric element and the electric circuit to the object surface by the cover member and the process of bonding the piezoelectric element to the object surface by the adhesive layer having a predetermined thickness are the same process. Can be executed.

  Further, the flange surface 34 of the cover member is extended along the peripheral edge except for the two small gap portions 38-1 and 38-2 opposed to each other in the planar outline of the piezoelectric element, and the adhesive layer 16-14 is formed by the piezoelectric element. 12 and the surface of the object 14 and the surface of the flange surface that are spaced apart from the object surface 36 and are opposed to each other, the air is discharged from one of the small gap portions 38-1 and 38-2 while the other surface is discharged. If the adhesive is pressed into the space from the gap, the piezoelectric element and the electric circuit are assembled to the object surface by the cover member, and the piezoelectric element is attached to the object surface by the adhesive layer having a predetermined thickness. The process of joining to is further streamlined.

  FIG. 11 is a view similar to FIG. 9 in which a part of the structure shown in FIG. 9 is changed. In this case, the inner surface 32 of the cover member 30 is separated from the upper surface of the electric circuit 28, and the electric circuit 28 is placed on the piezoelectric element 12 and fixed to the piezoelectric element 12 by any fixing means not shown in the drawing. Has been. The cover member has a surface portion 40 facing the object surface at a position spaced apart from the flange surface 34 contacting the object surface by a distance corresponding to the sum of the thickness of the piezoelectric element 12 and the thickness of the adhesive layer to be formed. Thus, the adhesive layer is formed with a thickness corresponding to the difference between the distance between the surface portion 40 and the flange surface 34 and the thickness of the piezoelectric element 12.

  While the present invention has been described in detail with respect to several embodiments thereof, it will be apparent to those skilled in the art that various modifications can be made to these embodiments within the scope of the present invention. .

1 is an exploded sectional view showing a piezoelectric vibration detection / suppression device according to the present invention in one embodiment. FIG. 2 is a plan view of the piezoelectric vibration detection / suppression device shown in FIG. 1. FIG. 3 is a plan view showing a piezoelectric vibration detection / suppression device similar to that shown in FIG. 2 with a part of the piezoelectric vibration detection / suppression device shown in FIGS. 1 and 2 changed. FIG. 3 is a plan view showing another similar piezoelectric vibration detection / suppression device similar to that shown in FIG. 2 in which a part of the piezoelectric vibration detection / suppression device shown in FIGS. 1 and 2 is changed. FIG. 3 is an exploded sectional view similar to FIG. 1 showing a piezoelectric vibration detection / suppression device according to the present invention in another embodiment. FIG. 6 is a plan view of the piezoelectric vibration detection / suppression device shown in FIG. 5. The top view which shows the piezoelectric vibration detection / suppression apparatus similar to this which changed a part of piezoelectric vibration detection / suppression apparatus shown to FIG. 5 and FIG. 6 in the same way as FIG. The same figure as FIG. 5 which shows the example in which it replaced with the spacer and the protrusion part which limited the thickness of an adhesive material layer was formed in a part of piezoelectric element. FIG. 6 is an exploded sectional view similar to FIGS. 1 and 5 showing a piezoelectric vibration detection / suppression device according to the present invention in still another embodiment. FIG. 10 is a cross-sectional plan view of the piezoelectric vibration detection / suppression device shown in FIG. The same figure as FIG. 9 which changed a part of structure shown in FIG. FIG. 4 is a prior art explanatory diagram showing three cases A, B, and C when the piezoelectric element 100 is attached to the surface of an object 102 with a certain amount of adhesive. FIG. 3 is a prior art explanatory diagram showing correspondence between bending deformation of an object surface and expansion / contraction deformation of a piezoelectric element when only both ends of the piezoelectric element are fixed to the surface of the object by an adhesive.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10a-10f ... Piezoelectric vibration detection / suppression apparatus, 12 ... Piezoelectric element, 14 ... Object, 16-1 to 16-14 ... Adhesive material layer, 18 ... Piezoelectric material layer, 18-1, 18-2 ... Piezoelectric material layer 20, 22 ... electrodes, 24-1 to 24-3 ... spacers, 26-1 and 26-2 ... spacer gaps, 28 ... electric circuit, 30 ... cover member, 32 ... cover member Inner surface, 34: flange surface of cover member, 36: separation surface portion of cover member, 38-1, 38-2 ... small gap portion of flange surface of cover member, 40 ... surface portion, 100 ... piezoelectric element, 102 ... object, 104 ... Adhesive, 106 ... Adhesive layer

Claims (12)

  A piezoelectric vibration detection / suppression device including a piezoelectric element having a piezoelectric material layer and a counter electrode, and an adhesive layer for attaching the piezoelectric element to a surface of an object to be subjected to vibration detection or suppression, The piezoelectric vibration detecting / suppressing device, wherein the adhesive layer is provided separately at both ends and a central portion of the piezoelectric element along a curvature of the surface due to vibration of the object.   The piezoelectric element has a substantially quadrangular planar outline, and adhesive layers at both ends are provided along opposite sides of the substantially quadrangular planar outline, and the adhesive layer in the central part 2. The piezoelectric vibration detection / suppression device according to claim 1, wherein the piezoelectric vibration detection / suppression device is provided in a band extending substantially parallel to both sides at an intermediate position between the two sides.   The adhesive layers at the both ends are provided as adhesive layers scattered in opposite end regions of the planar contour of the piezoelectric element, and the center adhesive layer is an intermediate portion between the end regions. The piezoelectric vibration detection / suppression device according to claim 1, wherein the piezoelectric vibration detection / suppression device is provided as an adhesive layer scattered in the region.   The planar contour of the piezoelectric element is substantially quadrangular, and the adhesive layers interspersed with the two end regions are at least two points spaced along opposite ends of the substantially quadrangular planar contour. 4. The adhesive layer according to claim 3, wherein the adhesive layer includes an adhesive layer and is scattered in the intermediate region, and includes at least one interspersed adhesive layer located between the both ends. Piezoelectric vibration detection / suppression device.   The planar contour of the piezoelectric element is substantially quadrangular, and the adhesive layers scattered in the both end regions are a pair of points that are biased to the same side along opposite ends of the substantially quadrangular planar contour. One interspersed adhesive layer that includes an interstitial adhesive layer, and the interstitial adhesive layer that is interspersed in the intermediate region is biased to the opposite side of the interstitial adhesive layer at the both ends in the middle of the both ends The piezoelectric vibration detecting / suppressing device according to claim 3, comprising:   A piezoelectric vibration detection / suppression device including a piezoelectric element having a piezoelectric material layer and a counter electrode, and an adhesive layer for attaching the piezoelectric element to a surface of an object to be subjected to vibration detection or suppression, The piezoelectric element is separated from the surface of the object by a spacer that limits the thickness of the adhesive layer, and the adhesive layer is a space between the piezoelectric element and the surface of the object that are separated by the spacer. A piezoelectric vibration detecting / suppressing device, characterized in that the piezoelectric vibration detecting / suppressing device is provided.   The spacer extends along the periphery of the piezoelectric element except for two small gaps facing each other in the planar outline, and the adhesive layer is surrounded by the piezoelectric element, the surface of the object, and the spacer. The piezoelectric vibration detecting / suppressing device according to claim 6, wherein the piezoelectric vibration detecting / suppressing device is formed by an adhesive press-fitted into the space from one of the small gap portions.   A piezoelectric vibration detection / suppression device including a piezoelectric element having a piezoelectric material layer and a counter electrode, and an adhesive layer for attaching the piezoelectric element to a surface of an object to be subjected to vibration detection or suppression, The piezoelectric element is separated from the surface of the object by a protrusion that limits the thickness of an adhesive layer formed on a part of the piezoelectric element, and the adhesive layer is separated from the surface of the piezoelectric element by the protrusion. A piezoelectric vibration detecting / suppressing device provided to fill a space between a surface and a surface of the object.   A piezoelectric vibration detection / suppression device including a piezoelectric element having a piezoelectric material layer and a counter electrode, and an adhesive layer for attaching the piezoelectric element to a surface of an object to be subjected to vibration detection or suppression, The piezoelectric element is attached to the surface of the object by a cover member in a state where an electric circuit electrically combined with the piezoelectric element is laminated thereon, and an inner surface for pressing the electric circuit of the cover member, The adhesive layer is provided with a thickness corresponding to a difference between a distance between a flange surface in contact with a surface of an object and a thickness formed by a laminate of the piezoelectric element and the electric circuit. Piezoelectric vibration detection / suppression device.   The cover member has a surface portion that is spaced apart from the surface of the object inside the flange surface and faces the surface of the object, and the adhesive applied between the spaced surface portion and the surface of the object. The piezoelectric vibration detecting / suppressing device according to claim 8, wherein the piezoelectric vibration detecting / suppressing device is fixed to the surface of the object by a layer.   The flange surface of the cover member extends along the periphery of the piezoelectric element except for two small gaps facing each other in a planar outline, and the adhesive layer includes the piezoelectric element and the surface of the object. It is formed by an adhesive material press-fitted into the space from one of the small gap portions in a space that is spaced apart from the object surface of the flange surface and surrounded by a surface portion facing the object surface. The piezoelectric vibration detection / suppression device according to claim 9. A piezoelectric vibration detection / suppression device including a piezoelectric element having a piezoelectric material layer and a counter electrode, and an adhesive layer for attaching the piezoelectric element to a surface of an object to be subjected to vibration detection or suppression, The piezoelectric element is attached to the surface of the object by a cover member in a state where an electric circuit electrically combined with the piezoelectric element is placed thereon, and the cover member abuts on the surface of the object A distance between the flange surface and a flange surface that is spaced apart from the surface of the object and faces the surface of the object on the inner side of the flange surface; A piezoelectric vibration detecting / suppressing device, wherein the adhesive layer is provided with a thickness corresponding to a difference in thickness of the element.

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