JP4540544B2 - Piezoelectric vibration element - Google Patents

Description

  The present invention relates to a piezoelectric vibration element used for a piezoelectric sound generator or the like.

FIG. 5 of Japanese Patent Application Laid-Open No. 62-290299 shows a piezoelectric vibration element having a plurality of piezoelectric vibrators. This piezoelectric vibration element supports a plurality of piezoelectric vibration bodies that can be vibrated so that a plurality of piezoelectric vibration bodies each having piezoelectric elements bonded to both surfaces of a diaphragm are opposed to the piezoelectric elements of the plurality of piezoelectric vibration bodies. And a supporting body. The piezoelectric elements of the plurality of piezoelectric vibrators are electrically connected by soldered lead wires. Further, the diaphragms of the plurality of piezoelectric vibrators are also electrically connected by lead wires by soldering.
JP 62-290299 A (FIG. 5)

  However, in such a piezoelectric vibration element, it is necessary to perform soldering and wiring of lead wires, and the manufacturing becomes complicated. Moreover, since soldering is performed, the dimension in the vibration direction of the plurality of piezoelectric vibrators is increased. Further, when the height dimension of the soldered portion of the piezoelectric element is increased, there is a problem that a plurality of piezoelectric vibrators interfere with each other.

  An object of the present invention is to provide a piezoelectric vibration element that can easily perform electrical connection of each piezoelectric element of a plurality of piezoelectric vibrators and electrical connection of a diaphragm.

  Another object of the present invention is to provide a piezoelectric vibration element capable of reducing the size in the vibration direction of a plurality of piezoelectric vibrators.

  Another object of the present invention is to provide a piezoelectric vibration element capable of preventing a plurality of piezoelectric vibrators from interfering with each other.

  The piezoelectric vibration element of the present invention includes n (n is an integer of 2 or more) piezoelectric vibration members, a support, a first electrical connection unit, and a second electrical connection unit. Yes. The n piezoelectric vibrating bodies have a plurality of electrode layers and one or more piezoelectric vibrating layers alternately so that the front electrode layer has the first polarity on the front surface and the back electrode layer has the second polarity on the back surface. The first and second piezoelectric elements and the diaphragm having conductivity are laminated, and the back electrode layer of the first piezoelectric element is joined to the surface of the diaphragm so as to be electrically conductive, The back electrode layer of the piezoelectric element is joined to the back surface of the diaphragm so as to be electrically conductive. The support is configured so that the second piezoelectric elements of the n piezoelectric vibrators and the first piezoelectric elements face each other with a predetermined interval, and the n piezoelectric vibrators can vibrate. n piezoelectric vibrators are supported. The first electrical connection means is connected to one output terminal of the power source by electrically connecting 2n surface electrode layers included in the n piezoelectric vibrators to each other. The second electrical connection means is connected to the other output terminal of the power source by electrically connecting n diaphragms included in the n piezoelectric vibrators. And the 1st and 2nd piezoelectric vibrating body has a diaphragm exposure part comprised by exposing a part of diaphragm at the part supported by a support body, respectively. The support body has a structure that supports the end portions or the center portion of the n piezoelectric vibrators so that the n piezoelectric vibrators can vibrate respectively. The first electrical connection means includes a plurality of conductive contact pieces in contact with the 2n surface electrode layers and has a structure that is attached to the n piezoelectric vibrators. The electrical connection means 2 has a structure that includes a plurality of conductive contact pieces that come into contact with the exposed portions of the diaphragms of the n piezoelectric vibrators and is attached to the n piezoelectric vibrators. .

  According to the present invention, since it is not necessary to solder the piezoelectric element as in the prior art, the dimensions in the vibration direction of the plurality of piezoelectric vibrators can be reduced. Further, it is possible to prevent a plurality of piezoelectric vibrators from interfering with each other. The 2n surface electrode layers are not limited to materials that can withstand soldering. Therefore, various materials such as metal resin paste or metal foil can be used.

  Each of the first and second electrical connecting means is preferably composed of first and second clip members that are elastically attached to the piezoelectric vibrating body. In this way, the surface electrode layers included in the piezoelectric vibrator can be electrically connected to each other by a simple operation of mounting the first clip member on the piezoelectric vibrator, and the second clip member. The diaphragms included in the piezoelectric vibrator can be electrically connected to each other by a simple operation of attaching the piezoelectric vibrator to the piezoelectric vibrator. This facilitates mass production of the piezoelectric vibration element.

  When mounting concave portions for mounting the first and second clip members to the n piezoelectric vibrating bodies are formed on the support, it is preferable to fill the mounting concave portions with an adhesive. In this way, it is possible to easily and reliably mount the first and second clip members on the n piezoelectric vibrators and support the n piezoelectric vibrators on the support body.

  A piezoelectric vibration element including two piezoelectric vibrators includes first and second piezoelectric vibrators, a support, first electrical connection means, and second electrical connection means. . The first and second piezoelectric vibrators have a plurality of electrode layers and one or more piezoelectric vibration layers so as to have a surface electrode layer having a first polarity on the surface and a back electrode layer having a second polarity on the back surface. The first and second piezoelectric elements and the diaphragm having conductivity are alternately stacked, and the back electrode layer of the first piezoelectric element is joined to the surface of the diaphragm so as to be electrically conductive, The back electrode layer of the second piezoelectric element is joined to the back surface of the diaphragm so as to be electrically conductive. The support is such that the second piezoelectric element of the first piezoelectric vibrator and the first piezoelectric element of the second piezoelectric vibrator are opposed to each other with a predetermined interval, and the first and second piezoelectric vibrators are The first and second piezoelectric vibrators are supported so that they can vibrate. The first electrical connecting means is connected to one output terminal of the power source by electrically connecting the four surface electrode layers included in the first and second piezoelectric vibrators. The second electrical connection means is connected to the other output terminal of the power source by electrically connecting the two diaphragms included in the first and second piezoelectric vibrators. And the 1st and 2nd piezoelectric vibrating body has a diaphragm exposure part comprised by exposing a part of diaphragm at the part supported by a support body, respectively. The support has a structure that supports the end portions or the center of the first and second piezoelectric vibrators so that the first and second piezoelectric vibrators can vibrate, respectively. The first electrical connecting means is inserted between a pair of sandwiching pieces that sandwich the first piezoelectric vibrating body and the second piezoelectric vibrating body, and between the first piezoelectric vibrating body and the second piezoelectric vibrating body. The first clip member is provided with a pair of contact pieces and is elastically attached to the first and second piezoelectric vibrators. The first clip member is electrically conductive as a whole, has a length such that the pair of sandwiching pieces are in contact with the surface electrode layers located outside the first and second piezoelectric vibrators, respectively. The contact piece has a length in contact with the surface electrode layer located inside each of the first and second piezoelectric vibrators, and the second electrical connection means includes the first piezoelectric vibrator And a second clip member that is elastically attached to the first and second piezoelectric vibrators with a pair of sandwiching pieces sandwiching the second piezoelectric vibrator between them. The second clip member has conductivity as a whole, and one clamping piece of the pair of clamping pieces comes into contact with the exposed portion of the diaphragm on the surface of the diaphragm of the first piezoelectric vibrator, and the other clamping piece. Has a length in contact with the exposed portion of the diaphragm on the back surface of the diaphragm of the second piezoelectric vibrator.

  If comprised in this way, only the 1st clip member will be attached to the 1st and 2nd piezoelectric vibrating bodies, and the four surface electrode layers contained in the 1st and 2nd piezoelectric vibrating bodies will be electrically connected. The two diaphragms included in the first and second piezoelectric vibrators can be electrically connected to each other by simply attaching the second clip member to the first and second piezoelectric vibrators. Can be connected to each other. Therefore, electrical connection of the respective surface electrode layers and electrical connection of the diaphragm included in the first and second piezoelectric vibrators can be performed by a simple operation of inserting the clip.

  Furthermore, since there is no need to solder the first and second piezoelectric elements as in the prior art, the dimensions in the vibration direction of the first and second piezoelectric vibrators can be reduced. In addition, the first and second piezoelectric vibrators can be prevented from interfering with each other.

  The support body can be configured to include first and second partition walls that are spaced apart from each other between the first piezoelectric vibrating body and the second piezoelectric vibrating body. In this case, a portion of the first piezoelectric vibrating body and the second piezoelectric vibrating body where the first partition wall portion is disposed is sandwiched between the pair of sandwiching pieces of the first clip member, and the first partition wall portion and A pair of contact pieces of the first clip member is inserted between the first piezoelectric vibrator and the second piezoelectric vibrator from between the second partition wall portion, and the first piezoelectric vibrator and the second piezoelectric member. What is necessary is just to make it the part by which the 2nd partition part of a vibrating body is arrange | positioned in between being pinched | interposed into a pair of clamping piece of a 2nd clip member. If it does in this way, the 1st and 2nd piezoelectric vibrating body can be firmly supported on a support body by the 1st and 2nd partition part.

  When the mounting recess for mounting the first and second clip members to the first and second piezoelectric vibrators is formed on the support, it is preferable to fill the mounting recess with an adhesive. . In this way, the first and second clip members can be easily and reliably attached to the first and second piezoelectric vibrators and supported by the first and second piezoelectric vibrators.

  The pair of clamping pieces of the first clip member has a shape protruding in a direction facing each other, and the pair of contact pieces of the first clip member has a shape protruding in a direction away from each other. The pair of clamping pieces of the second clip member preferably has a shape protruding in a direction facing each other. In this way, the first and second clip members are elastically attached to the first and second piezoelectric vibrating bodies, and the two can be reliably joined.

  In this case, the first partition member is provided with an extension portion that pushes the pair of clamping pieces of the first clip member when the first clip member is attached to the first and second piezoelectric vibrating bodies, If the second clip member is provided on the partition wall of the first and second piezoelectric vibrating bodies, the first and the second clip members are provided with an extension portion that pushes the pair of sandwiching pieces when the second clip member is attached to the first and second piezoelectric vibrators. The clip member can be easily attached to the first and second piezoelectric vibrators.

  The first and second clip members are preferably formed by processing one metal plate. In this way, the first and second clip members can be easily mass-produced.

  According to the present invention, the surface electrode layers included in the piezoelectric vibrating body can be electrically connected to each other by a simple operation of mounting the first clip member on the piezoelectric vibrating body. The diaphragms included in the piezoelectric vibrator can be electrically connected to each other by a simple operation of attaching the piezoelectric vibrator to the piezoelectric vibrator. This facilitates mass production of the piezoelectric vibration element.

  Furthermore, since it is not necessary to solder the piezoelectric element as in the prior art, the dimensions in the vibration direction of the plurality of piezoelectric vibrators can be reduced. Further, it is possible to prevent a plurality of piezoelectric vibrators from interfering with each other.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial perspective view of the piezoelectric sounder constituting the piezoelectric vibration element according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II in FIG. 3 is a partial cross-sectional view taken along line III-III in FIG. 1, and FIG. 4 is a partial cross-sectional view taken along line IV-IV in FIG. 1 shows a state in which the first and second piezoelectric vibrators, the support, and the first and second clip members are disassembled, and FIGS. 2 to 4 show the first and second piezoelectric vibrators. The state which combined the piezoelectric vibrating body, the support body, and the 1st and 2nd clip member is shown. In each drawing, some thickness dimensions are exaggerated for easy understanding. As shown in the drawings, the piezoelectric sounder 1 of this example includes a support 3 and n (n is an integer of 2 or more, 2 in this example) first and second supported by the support 3. Piezoelectric vibrators 5A and 5B, a first clip member 7, and a second clip member 9.

  The support 3 is made of an insulating material such as polybutylene terephthalate (PBT), and has a base 11 and a main body 13 integrally. The main body 13 has a rectangular parallelepiped outline and has a mounting recess 15 penetrating the inside. The mounting recess 15 has a first opening 15a and a second opening 15b facing the first opening 15a. Since the first opening 15 a and the second opening 15 b are relatively large, the main body 13 has first to fourth walls 13 a to 13 d surrounding the mounting recess 15. Become. Two vibrating body fitting recesses 17A and 17B communicating with the mounting recess 15 are formed in the first wall 13a of the main body 13 (only 17A is shown for convenience in FIG. 1). Two vibrating body fitting recesses 17C and 17D communicating with the mounting recess 15 are formed in the third wall portion 13c. The vibrator fitting recesses 17A to 17D have an elongated shape that opens toward the first opening 15a and extends from the first opening 15a to the second opening 15b. The first piezoelectric vibrating body 5A has a first opening in a vibrating body fitting recess 17A formed in the first wall portion 13a and a vibrating body fitting recess 17C formed in the third wall portion 13c. It is inserted and fitted from the 15a side. In addition, the second piezoelectric vibrating body 5B includes the first piezoelectric vibrating body 5B in the vibrating body fitting recess 17B formed in the first wall portion 13a and the vibrating body fitting recess 17D formed in the third wall portion 13c. It is inserted and fitted from the opening 15a side.

  The main body 13 is formed with first and second partition walls 19 and 21 that protrude into the mounting recess 15. The first partition wall portion 19 is a plate-shaped partition wall main body extending toward the third wall portion 13c from the portion between the vibration member fitting recess 17A and the vibration member fitting recess 17B of the first wall portion 13a. 19a is located at the end of the partition wall body 19a on the second opening 15b side and has a larger thickness dimension (dimension in the direction in which the second wall portion 13b and the fourth wall portion 13d face each other) than the partition wall body 19a. And an extended portion 19b. The second partition wall 21 includes a partition wall main body 21a extending from the portion between the vibrating body fitting recess 17C and the vibrating body fitting recess 17D of the third wall 13c toward the first wall 13a. The partition wall body 21a has an extended portion 21b located at the end of the partition wall body 21a on the second opening 15b side and having a larger thickness than the partition wall body 21a. Further, the second opening 15 b is connected to the extended portion 21 b of the second partition wall portion 21, and the second wall is formed so as to form a gap with the extended portion 19 b of the first partition wall portion 19. An elongated reinforcing portion 23 extending between the portion 13b and the fourth wall portion 13d is formed.

  Further, the fourth wall portion 13d of the main body portion 13 is formed with a through hole 3a that allows the inside of the mounting recess 15 to communicate with the outside. In the mounting recess 15, the first and second piezoelectric vibrators 5 </ b> A, 5 </ b> B and the first and second clip members 7, 9 are combined from the through-hole 3 a with, for example, an epoxy resin. The agent is filled.

  As shown in detail in FIG. 2, each of the first and second piezoelectric vibrators 5 </ b> A and 5 </ b> B includes a diaphragm 25, a first piezoelectric element 27, and a second piezoelectric element 29. That is, in this example, a bimorph type piezoelectric element is employed in which the piezoelectric elements 27 and 29 are bonded to both surfaces of the diaphragm 25, respectively. The diaphragm 25 has an elongated rectangular plate shape having a front surface 25a and a back surface 25b, and is formed of a metal plate made of iron-nickel alloy, brass or the like. The first piezoelectric element 27 includes two electrode layers 27a and 27b, a piezoelectric vibration layer 27c, and a front electrode layer 27a having a first polarity on the front surface and a back electrode layer 27b having a second polarity on the back surface. Is a laminated piezoelectric element having a structure in which are alternately laminated. Since the surface electrode layer 27a is not soldered as will be described later, it is possible to use a material made of various materials not suitable for soldering such as a metal resin paste or a metal foil. In the first piezoelectric element 27, the back electrode layer 27b having the first polarity is formed on the surface 25a of the diaphragm 25 so that the diaphragm exposed portion 25c is left at one end in the longitudinal direction of the surface 25a of the diaphragm 25. It is joined. Similarly to the first piezoelectric element 27, the second piezoelectric element 29 has two electrode layers such that the front electrode layer 29a has the first polarity on the surface and the back electrode layer 29b has the second polarity on the back surface. This is a laminated piezoelectric element having a structure in which 29a, 29b and piezoelectric vibration layers 29c are alternately laminated. Also in the second piezoelectric element 29, the back electrode layer 29b having the first polarity is formed on the back surface 25b of the vibration plate 25 so that the vibration plate exposed portion 25d is left at one end in the longitudinal direction of the back surface 25b of the vibration plate 25. It is joined. The first piezoelectric vibrating body 5A is inserted into the first opening 15a side at the end in the longitudinal direction where the vibration plate exposed portions 25c and 25d of the vibration plate 25 are located. The fitting recess 17A and the vibrator fitting recess 17C are fitted. Further, the second piezoelectric vibrator 5B is also inserted into the longitudinal end of the diaphragm 25 where the diaphragm exposed portions 25c and 25d are located from the first opening 15a side, so that the support body 3 is fitted with the vibrator. The fitting recess 17B and the vibrator fitting recess 17D are fitted. Further, a spacer 6 is disposed between the first piezoelectric vibrating body 5A and the second piezoelectric vibrating body 5B so as to be fixed to the first piezoelectric vibrating body 5A and the second piezoelectric vibrating body 5B. . The spacer 6 is made of a flexible synthetic resin such as polyurethane. In the first and second piezoelectric vibrating bodies 5A and 5B, when a current flows between the diaphragm 25 and the first and second piezoelectric elements 27 and 29, the first and second piezoelectric vibrations. It vibrates in the thickness direction (arrow A) of the bodies 5A and 5B. As described above, the first and second piezoelectric vibrators 5A and 5B are configured such that the second piezoelectric element 29 of the first piezoelectric vibrator 5A and the first piezoelectric element 27 of the second piezoelectric vibrator 5B are predetermined. The end portions in the longitudinal direction are supported by the support body 3 so that the first and second piezoelectric vibration bodies 5A and 5B can vibrate with a gap therebetween. In addition, the first and second piezoelectric vibrators 5A and 5B have diaphragm exposed portions 25c and 25d formed by exposing a part of the diaphragm 25 to a portion supported by the support 3.

  As shown in FIG. 1, the first clip member 7 is formed by processing a single metal plate made of phosphor bronze, and includes a pair of sandwiching pieces 31 and 33, a first connecting portion 35, and a pair of Contact pieces 37 and 39 and a second connecting portion 41 are provided. The pair of sandwiching pieces 31 and 33 both have a rectangular shape and are opposed to each other with a space therebetween. The pair of sandwiching pieces 31 and 33 has two protrusions 31a and 33a at the ends that protrude in directions facing each other. The first connecting portion 35 has an arc shape with a substantially U-shaped cross section, and connects the pair of sandwiching pieces 31 and 33. Each of the pair of contact pieces 37 and 39 has a rectangular shape, and is opposed to each other while being in contact with each other. The pair of contact pieces 37 and 39 are arranged so as to be adjacent to the virtual surface when a virtual surface parallel to the pair of sandwiching pieces 31 and 33 is assumed at an intermediate position between the pair of sandwiching pieces 31 and 33. Yes. The pair of contact pieces 37 and 39 has a shape that curves in a direction away from each other at the end. And two protrusion parts 37a and 39a which protrude in the direction which leaves | separates mutually are formed in these edge parts. The second connecting portion 41 has a substantially square annular cross section and is connected to the first connecting portion 35. The second connecting portion 41 connects the pair of contact pieces 37 and 39.

  Similarly to the first clip member 7, the second clip member 9 is formed by processing a single metal plate made of phosphor bronze, and has a pair of clamping pieces 43 and 45 and a connecting portion 47. Yes. The pair of sandwiching pieces 43 and 45 have a rectangular shape and are opposed to each other with an interval. The pair of sandwiching pieces 43 and 45 have shapes that curve in directions facing each other. And two protrusion parts 43a and 45a which protrude in the direction which mutually faces are formed in these edge parts. The connecting portion 47 has an arc shape with a substantially U-shaped cross section, and connects the pair of sandwiching pieces 43 and 45.

  The first clip member 7 and the second clip member 9 are inserted from the second opening 15b of the support 3 and are elastically attached to the first and second piezoelectric vibrating bodies 5A and 5B. Is done. Specifically, as shown in FIGS. 1 and 2, the pair of sandwiching pieces 31 and 33 of the first clip member 7 is between the first wall portion 13 a and the reinforcing portion 23 of the second opening 15 b. When the first piezoelectric vibrating body 5A and the second piezoelectric vibrating body 5B are interposed between the first piezoelectric vibrating body 5A and the first piezoelectric vibrating body 5B, the first partition wall 19 is sandwiched between the first piezoelectric vibrating body 5A and the first piezoelectric vibrating body 5B. As a result, the protrusions 31a and 33a of the pair of sandwiching pieces 31 and 33 are in contact with the surface electrode layers 27a and 29a located on the outer sides of the first and second piezoelectric vibrators 5A and 5B, respectively. That is, the surface electrode layer 27a of the first piezoelectric element 27 of the first piezoelectric vibrating body 5A and the surface electrode layer 29a of the second piezoelectric element 29 of the second piezoelectric vibrating body 5B are in contact with each other. Further, as shown in FIGS. 1 and 3, the pair of contact pieces 37 and 39 of the first clip member 7 is between the first partition wall portion 19 and the reinforcing portion 23 adjacent to the second partition wall portion 21. To the first piezoelectric vibrator 5A and the second piezoelectric vibrator 5B. Accordingly, the protrusions 37a and 39a of the pair of contact pieces 37 and 39 are in contact with the surface electrode layers 29a and 27a located inside the first and second piezoelectric vibrating bodies 5A and 5B, respectively. That is, the surface electrode layer 29a of the second piezoelectric element 29 of the first piezoelectric vibrating body 5A and the surface electrode layer 27a of the first piezoelectric element 27 of the second piezoelectric vibrating body 5B are in contact with each other. Thus, the first clip member 7 electrically connects the 2n (four in this example) surface electrode layers (27a, 29a) included in the first and second piezoelectric vibrators 5A, 5B to each other. The first electrical connection means is configured to be connected to and connected to one output terminal of the power source.

  Moreover, as shown in FIG.1 and FIG.4, a pair of clamping pieces 43 and 45 of the 2nd clip member 9 are the area | regions between the reinforcement part 23 of the 2nd opening part 15b, and the 3rd wall part 13c. Is inserted by the extension portion 21b, and then sandwiches a portion where the second partition wall portion 21 of the first piezoelectric vibrating body 5A and the second piezoelectric vibrating body 5B is disposed. Thereby, one clamping piece 43 of a pair of clamping pieces 43 and 45 contacts the diaphragm exposed part 25c of the surface 25a of the diaphragm 25 of the first piezoelectric vibrating body 5A, and the other clamping piece 45 is the second. The vibration plate exposed portion 25d of the back surface 25b of the vibration plate 25 of the piezoelectric vibration member 5B comes into contact. In this way, the second clip member 9 electrically connects the n (two in this example) diaphragms 25 included in the first and second piezoelectric vibrators 5A and 5B to each other. The second electrical connection means connected to the other output terminal of the second is configured.

  According to the piezoelectric sounder 1 of the present example, the first clip member 7 is attached to the first and second piezoelectric vibrators 5A and 5B by a simple operation, and the first and second piezoelectric vibrators 5A and 5B are attached. The included surface electrode layers 27a and 29a can be electrically connected to each other, and the first and second piezoelectric vibrators 5A and 5B can be attached to the first and second piezoelectric vibrators 5A and 5B by a simple operation. The diaphragms 25 included in the second piezoelectric vibrators 5A and 5B can be electrically connected to each other. Therefore, mass production of the piezoelectric sounder 1 becomes easy.

  Furthermore, since it is not necessary to solder the piezoelectric elements 27 and 29 as in the conventional case, the dimension of the vibration direction (arrow A) of the first and second piezoelectric vibrating bodies 5A and 5B can be reduced. In addition, the first and second piezoelectric vibrators 5A and 5B can be prevented from interfering with each other.

  FIG. 5 is a perspective view of a piezoelectric sounder constituting the piezoelectric vibration element according to the second embodiment of the present invention. In the piezoelectric vibration element of this example, the center part in the longitudinal direction of each of the first and second piezoelectric vibrating bodies 105 </ b> A and 105 </ b> B is supported by the support body 103.

  In this example, the mounting recess 115 of the support 103 has a first opening 115a and a second opening 115b facing each other, and a first opening 115a and a second opening 115b facing each other. And a third opening 115c that opens in a direction orthogonal to the direction. Since the third opening 115c has a relatively large opening, and the first opening 115a and the second opening 115b have an elongated shape and a small opening, the support 103 surrounds the mounting recess 115. It has 1st-5th wall part 113a-113e. The first wall 113a, the third wall 113c, and the fifth wall 113e have a plurality of openings that open to the first opening 115a and the second opening 115b and communicate with the mounting recess 115. Vibrating body fitting recesses are formed (in FIG. 5, only the vibrating body fitting recesses 117A and 117B formed in the third wall 113c are labeled for convenience). The first and second piezoelectric vibrators 105A and 105B are inserted and fitted into the plurality of vibrator fitting recesses from the first opening 115a or the second opening 115b side.

  Further, the support body 103 is formed with first and second partition wall portions 119 and 121 and a reinforcing portion 123 protruding into the mounting recess 115. The first and second partition wall portions 119 and 121 and the reinforcing portion 123 have the same structure as the first and second partition wall portions 19 and 21 and the reinforcing portion 23 of the first embodiment shown in FIG. Yes. The reinforcing portion 123 is formed with a through-hole through which the first and second piezoelectric vibrating bodies 105A and 105B pass.

  In this example, the first and second piezoelectric vibrators 105A and 105B are diaphragm exposed portions 125c and 125d configured such that a part of the diaphragm 125 is exposed at a central portion in the longitudinal direction supported by the support 103. have. The first and second piezoelectric vibrators 105A and 105B are inserted from the first opening 115a or the second opening 115b and are fitted into the plurality of vibrator fitting recesses 117A and 117B. Thus, the central portion in the longitudinal direction is supported by the support body 103. As a result, the first and second piezoelectric vibrating bodies 105A and 105B are both on the both sides of the support 103 when a current flows between the diaphragm 125 and the first and second piezoelectric elements 127 and 129. 1 vibrates in the thickness direction (arrows A1 and A2) of the first and second piezoelectric vibrators 105A and 105B.

  The first clip member 107 and the second clip member 109 have the same structure as that of the piezoelectric vibration element according to the first embodiment shown in FIG. Also in this example, the first clip member 107 and the second clip member 109 are inserted from the third opening 115c of the support 103 and attached to the first and second piezoelectric vibrators 105A and 105B. . For this reason, the first clip member 107 electrically connects the four surface electrode layers (127a, 129a) included in the first and second piezoelectric vibrators 105A, 105B to each other. First electrical connection means connected to the output terminal is configured, and the second clip member 109 electrically connects the two diaphragms 125 included in the first and second piezoelectric vibrators 105A and 105B. A second electrical connection means connected to each other and connected to the other output terminal of the power supply is configured.

  FIG. 6 is a perspective view of the support 203 and the first and second clip members 207 and 209 of the piezoelectric sounder constituting the piezoelectric vibration element according to the third embodiment of the present invention. The support 203 of the piezoelectric sounder of this example can support three piezoelectric vibrators. The support 203 is formed with first to fifth partition walls 219, 221, 222, 224, and 226 that protrude into the mounting recess 215. The first partition wall 219 includes a plate-shaped partition wall main body 219a and an extension 219b extending from the first wall 213a toward the reinforcing portion 223 side. The second partition wall portion 221 includes a partition wall main body 221a and an extended portion 221b that extend from the reinforcing portion 223 toward the first wall portion 213a and are spaced apart from the first partition wall portion 219. Yes. The third partition wall 222 includes a plate-shaped partition wall main body 222a extending from the first wall portion 213a toward the reinforcing portion 223 and an extension portion 222b. The third partition wall portion 222 is arranged side by side with the first partition wall portion 219 and extends to a position corresponding to the end of the second partition wall portion 221. The fourth and fifth partition wall portions 224 and 226 extend in parallel across the reinforcing portion 223 and the third wall portion 213c. The fourth partition wall 224 is disposed at a position corresponding to the first and second partition walls 219 and 221, and the fifth partition wall 226 is disposed at a position corresponding to the third partition wall 222. ing. The fourth partition wall portion 224 includes a partition wall main body 224a and an extended portion 224b. The fifth partition wall portion 226 includes a partition wall body 226a and an extended portion 226b.

  The first clip member 207 is formed by processing a single metal plate, and includes a pair of sandwiching pieces 231 and 233, a first pair of contact pieces 237 and 239, and a second pair of contact pieces 238, 240. Each of the pair of sandwiching pieces 231 and 233 has a rectangular shape and is opposed to each other with a space therebetween. The pair of sandwiching pieces 231, 233 has two protrusions 231 a, 233 a (only 231 a shown) projecting in directions facing each other at the ends. Each of the pair of contact pieces 237 and 239 has a rectangular shape, and is opposed to each other while being in contact with each other. When the first pair of contact pieces 237 and 239 assume a virtual plane parallel to the pair of sandwiching pieces 231 and 233 at a position from the sandwiching piece 231 between the pair of sandwiching pieces 231 and 233, It is arranged to be adjacent. The first pair of contact pieces 237 and 239 have shapes that curve in directions away from each other at their ends. Two protrusions 237a and 239a projecting in directions away from each other are formed at these end portions. Each of the pair of contact pieces 238 and 240 has a rectangular shape, and is opposed to each other while being in contact with each other. The second pair of contact pieces 238 and 240 are parallel to the pair of holding pieces 231 and 233 and the first pair of contact pieces 237 and 239 at a position from the holding piece 233 between the pair of holding pieces 231 and 233. When a virtual surface is assumed, they are arranged adjacent to this virtual surface. The second pair of contact pieces 238, 240 has a shape that curves in a direction away from each other at the end. Two protrusions 238a and 240a projecting in directions away from each other are formed at these end portions.

  The second clip member 209 is formed by processing a single metal plate, and has a first pair of sandwiching pieces 243 and 245 and a second pair of sandwiching pieces 244 and 246. The first pair of sandwiching pieces 243 and 245 have a rectangular shape and are opposed to each other with a space therebetween. Each of the first pair of sandwiching pieces 243 and 245 has a shape that curves in a direction facing each other. Two protrusions 243a and 245a are formed on each of these end portions so as to protrude in directions facing each other. The second pair of sandwiching pieces 244 and 246 have a rectangular shape and face each other with a gap therebetween. One clamping piece 244 of the second pair of clamping pieces 244 and 246 is substantially the same as the first pair of clamping pieces 243 and 245 at a position from the clamping piece 245 between the first pair of clamping pieces 243 and 245. When a parallel virtual surface is assumed, they are arranged adjacent to this virtual surface. The other holding piece 246 of the second pair of holding pieces 244 and 246 is formed continuously with the holding piece 245 of the first pair of holding pieces 243 and 245. Each of the second pair of sandwiching pieces 244 and 246 has a shape that curves in a direction facing each other. Then, two protrusions 244a and 246a are formed at these end portions so as to protrude in directions facing each other.

  The first clip member 207 and the second clip member 209 are inserted from the second opening 215b of the support 203, and are elastically attached to first to third piezoelectric vibrators (not shown). The Specifically, when the pair of sandwiching pieces 231 and 233 of the first clip member 207 is inserted from the region between the first wall portion 213a and the reinforcing portion 223 of the second opening 215b, After being expanded by the extended portion 219b of the partition wall portion 219 and the extended portion 222b of the third partition wall portion 222, the protrusions 231a and 233a of the pair of sandwiching pieces 231 and 233 are the first and third piezoelectric vibrators. In contact with the surface electrode layers respectively located on the outside of the substrate. In addition, the first pair of contact pieces 237 and 239 of the first clip member 207 includes a first piezoelectric vibrating body and a second piezoelectric vibration between the first partition 219 and the second partition 221. Inserted between the body. Thereby, the protrusions 237a and 239a of the pair of contact pieces 237 and 239 are in contact with the surface electrode layers positioned inside the first and second piezoelectric vibrators, respectively. Further, the second pair of contact pieces 238 and 240 of the first clip member 207 is between the second piezoelectric vibrating body and the third piezoelectric vibrating body between the third partition wall 222 and the reinforcing portion 223. Inserted into. Accordingly, the protrusions 238a and 240a of the second pair of contact pieces 238 and 240 are in contact with the surface electrode layers positioned inside the first and second piezoelectric vibrators, respectively. As described above, the first clip member 207 electrically connects the 2n (six in this example) surface electrode layers included in the first to third piezoelectric vibrators to one of the power supplies. First electrical connection means connected to the output terminal is configured.

  Further, the first pair of sandwiching pieces 243 and 245 of the second clip member 209 are inserted from the region between the reinforcing portion 223 of the second opening 215b and the third wall portion 213c, and are shown in the figure. It is elastically attached to the first to third piezoelectric vibrators that do not. Specifically, after the first pair of sandwiching pieces 243 and 245 of the second clip member 209 are pushed and expanded by the extension portion 224b of the fourth partition wall portion 224 and the extension portion 226b of the fifth partition wall portion 226. The one sandwiching piece 243 of the pair of sandwiching pieces 243 and 245 is in contact with the vibration plate exposed portion of the surface of the diaphragm of the first piezoelectric vibrator, and the other sandwiching piece 245 is the diaphragm of the third piezoelectric vibrator. It touches the exposed part of the diaphragm on the back. In addition, after the second pair of sandwiching pieces 244 and 246 of the second clip member 209 is pushed and spread by the expansion portion 226b of the fifth partition wall portion 226, one sandwiching piece 244 of the pair of sandwiching pieces 244 and 246 is provided. Is in contact with a diaphragm exposed portion on the surface of the diaphragm of the second piezoelectric vibrator, and the other clamping piece 246 is in contact with a diaphragm exposed portion on the back surface of the diaphragm of the third piezoelectric vibrator. In this way, the second clip member 209 electrically connects the n (three in this example) diaphragms included in the first to third piezoelectric vibrators to the other output of the power source. Second electrical connection means connected to the terminals is configured.

  In each of the above embodiments, the first and second piezoelectric elements 27 and 29 have two electrode layers 27a and 27b and one piezoelectric vibration layer 27c, but three or more electrode layers are used. Of course, the present invention can also be applied to a piezoelectric vibration element including a piezoelectric element having two or more piezoelectric vibration layers.

  In each of the above embodiments, an example of a piezoelectric vibration element including two and three piezoelectric vibration members has been described. However, the present invention can also be applied to a piezoelectric vibration element including four or more piezoelectric vibration members. Of course. In that case, the first clip member and the second clip member may be formed by processing one metal plate so as to increase the sandwiching pieces and contact pieces to be joined to each piezoelectric vibration element.

One in a state where the first and second piezoelectric vibrators, the support, and the first and second clip members of the piezoelectric sounder constituting the piezoelectric vibrator of the first embodiment of the invention are disassembled. FIG. It is sectional drawing in the II-II line | wire of FIG. 1 in the state which combined the 1st and 2nd piezoelectric vibrating body, the support body, and the 1st and 2nd clip member. FIG. 3 is a partial cross-sectional view taken along line III-III in FIG. 1 in a state where the first and second piezoelectric vibrators, the support, and the first and second clip members are combined. FIG. 4 is a partial cross-sectional view taken along line IV-IV in FIG. 1 in a state in which the first and second piezoelectric vibrators, the support, and the first and second clip members are combined. It is a perspective view of the piezoelectric sounder which comprises the piezoelectric type vibration element of the 2nd Embodiment of this invention. It is a perspective view of the support body and the 1st and 2nd clip member of the piezoelectric sounder which comprise the piezoelectric type vibration element of the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Piezoelectric sounder 3 Support body 5A, 5B 1st and 2nd piezoelectric vibrating body 7 1st clip member 9 2nd clip member 15 Mounting recessed part 17A-17D Vibration body fitting recessed part 19 1st partition part 21 2nd partition part 25 Diaphragm 27 1st piezoelectric element 29 2nd piezoelectric element

Claims (10)

First and second layers in which a plurality of electrode layers and one or more piezoelectric vibration layers are alternately stacked so as to have a surface electrode layer having a first polarity on the surface and a back electrode layer having a second polarity on the back surface. And the back electrode layer of the first piezoelectric element is joined to the surface of the diaphragm so as to be electrically conductive, and the second piezoelectric element is N (n is an integer greater than or equal to 2) piezoelectric vibrators in which a back electrode layer is joined to the back face of the diaphragm so as to be electrically conductive;
The second piezoelectric elements of the n piezoelectric vibrators and the first piezoelectric elements face each other at a predetermined interval, and the n piezoelectric vibrators can vibrate. A support for supporting the n piezoelectric vibrators;
First electrical connection means for electrically connecting the 2n surface electrode layers included in the n piezoelectric vibrators to one output terminal of a power supply;
A second electrical connection means for electrically connecting the n diaphragms included in the n piezoelectric vibrators to each other and connecting to the other output terminal of the power source;
Each of the first and second piezoelectric vibrators has a diaphragm exposed portion configured such that a part of the diaphragm is exposed at a portion supported by the support.
The support has a structure that supports the end or center of the n piezoelectric vibrators so that the n piezoelectric vibrators can vibrate, respectively.
The first electrical connection means includes a plurality of conductive contact pieces in contact with the 2n surface electrode layers and has a structure that is attached to the n piezoelectric vibrators,
The second electrical connection means includes a plurality of conductive contact pieces that come into contact with the diaphragm exposed portions of the n piezoelectric vibrators and is attached to the n piezoelectric vibrators. A piezoelectric vibration element characterized by comprising:   2. The piezoelectric vibration element according to claim 1, wherein the 2n surface electrode layers are made of a metal resin paste or a metal foil.   2. The piezoelectric device according to claim 1, wherein each of the first and second electrical connection means includes first and second clip members that are elastically attached to the piezoelectric vibrating body. Type vibration element. A mounting recess for mounting the first and second clip members to the n piezoelectric vibrators is formed on the support.
The piezoelectric vibration element according to claim 1, wherein the mounting recess is filled with an adhesive. First and second layers in which a plurality of electrode layers and one or more piezoelectric vibration layers are alternately stacked so as to have a surface electrode layer having a first polarity on the surface and a back electrode layer having a second polarity on the back surface. And the back electrode layer of the first piezoelectric element is joined to the surface of the diaphragm so as to be electrically conductive, and the second piezoelectric element is First and second piezoelectric vibrators having a back electrode layer bonded to the back surface of the diaphragm so as to be electrically conductive;
The second piezoelectric element of the first piezoelectric vibrator and the first piezoelectric element of the second piezoelectric vibrator are opposed to each other with a predetermined interval, and the first and second piezoelectric vibrators A support for supporting the first and second piezoelectric vibrators, so that can vibrate,
First electrical connection means for electrically connecting the four surface electrode layers included in the first and second piezoelectric vibrators to each other and connected to one output terminal of a power source;
A second electrical connection means for electrically connecting the two diaphragms included in the first and second piezoelectric vibrators to each other and connecting to the other output terminal of the power source;
Each of the first and second piezoelectric vibrators has a diaphragm exposed portion configured such that a part of the diaphragm is exposed at a portion supported by the support.
The support has a structure that supports the end portions or the center of the first and second piezoelectric vibrators so that the first and second piezoelectric vibrators can vibrate, respectively.
The first electrical connecting means includes a pair of clamping pieces that sandwich the first piezoelectric vibrating body and the second piezoelectric vibrating body, and a gap between the first piezoelectric vibrating body and the second piezoelectric vibrating body. A first clip member that is elastically attached to the first and second piezoelectric vibrators with a pair of inserted contact pieces;
The first clip member is electrically conductive as a whole, and has a length such that the pair of sandwiching pieces are in contact with the surface electrode layers located outside the first and second piezoelectric vibrators, respectively. And the pair of contact pieces has a length in contact with the surface electrode layer located inside the first and second piezoelectric vibrators, respectively.
The second electrical connection means includes a pair of clamping pieces that sandwich the first piezoelectric vibrating body and the second piezoelectric vibrating body, and elastically moves to the first and second piezoelectric vibrating bodies. A second clip member to be mounted;
The second clip member is electrically conductive as a whole, and one of the pair of clamping pieces is in contact with the diaphragm exposed portion of the surface of the diaphragm of the first piezoelectric vibrating body; 2. The piezoelectric vibration element according to claim 1, wherein the other sandwiching piece has a length in contact with the diaphragm exposed portion on the back surface of the diaphragm of the second piezoelectric vibrator.   The piezoelectric vibration element according to claim 5, wherein the four surface electrode layers are made of a metal resin paste or a metal foil. The support has first and second partition walls arranged with a space between the first piezoelectric vibrator and the second piezoelectric vibrator,
A portion of the first piezoelectric vibrating body and the second piezoelectric vibrating body where the first partition wall portion is disposed is sandwiched between the pair of sandwiching pieces of the first clip member,
The pair of contact pieces of the first clip member is inserted between the first piezoelectric vibrating body and the second piezoelectric vibrating body from between the first partition wall portion and the second partition wall portion,
The portion of the first piezoelectric vibrating body and the second piezoelectric vibrating body in which the second partition wall portion is disposed is sandwiched between the pair of holding pieces of the second clip member. Piezoelectric vibration element. A mounting recess for mounting the first and second clip members on the first and second piezoelectric vibrators is formed on the support.
The piezoelectric vibration element according to claim 7, wherein the mounting recess is filled with an adhesive. The pair of sandwiching pieces of the first clip member has a shape protruding in a direction facing each other,
The pair of contact pieces of the first clip member has a shape protruding in a direction away from each other,
The pair of sandwiching pieces of the second clip member has a shape protruding in a direction facing each other,
The first partition wall has an expansion portion that pushes the pair of clamping pieces of the first clip member when the first clip member is attached to the first and second piezoelectric vibrators. And
The second partition wall portion has an extension portion that pushes the pair of holding pieces of the second clip member when the second clip member is attached to the first and second piezoelectric vibrators. The piezoelectric vibration element according to claim 7, wherein the piezoelectric vibration element is provided.   The piezoelectric vibration element according to claim 1, wherein the first and second clip members are formed by processing a single metal plate.

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