JP2010183820A - Generator for communication apparatus and communication apparatus having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a generator for a communication apparatus capable of attaining high power generation and to provide a communication apparatus having the same, in a portable communication apparatus such as a cellular phone. <P>SOLUTION: The generator 2 for a communication apparatus is provided with a piezoelectric element 20 having a fixed part 20A and a non-fixed part 20C which is bent and power-generated by an acceleration, and an interference member 23A which comes into contact with the non-fixed part 20C of the piezoelectric element 20 and promotes the bending deformation of the non-fixed part 20C. The generator 2 for a communication is further provided with the interference member 23A for promoting the bending deformation of the piezoelectric element 20 by interfering with the piezoelectric element 20. The interference member 23A is provided to continuously interfere with the piezoelectric element 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a communication device that can communicate using voice or text, and is portable, for example. The present invention is further used for communication equipment and relates to a power generation apparatus using a piezoelectric effect.

  A communication device such as a cellular phone is excellent in convenience because it can be used even when away from home. In such a communication device, since a storage battery such as a lithium ion battery is adopted as a power source, the communication device may become unusable due to a lack of charge at the destination. For this reason, it is considered to incorporate a power generation device in a communication device such as a mobile phone. This power generation device is mainly intended to replenish the storage battery with charge, and in one example, there is a device that uses a charge generated by distortion deformation of a piezoelectric element (see, for example, Patent Documents 1 and 2).

  The power generation device described in Patent Literature 1 includes a vibration power generation unit that generates power by applying vibration. The vibration power generation unit generates power by applying stress to the piezoelectric element by vibration. In the vibration power generation unit, for example, vibration is applied to a piezoelectric element having one end fixed. In this case, the vibration power generation unit applies stress to the piezoelectric element by repeatedly pulling a string connected to the other end of the piezoelectric element via a spring.

  On the other hand, the power generation device described in Patent Document 2 is used for a mobile phone, and has a pair of piezoelectric ceramic vibrators having different polarization directions attached to both surfaces of a plate-like elastic body. The elastic body has one end fixed to the case and a weight attached to the other end. For this reason, in the power generation device, when an inertial force is applied to the other end portion (free end) of the elastic body by the weight, the free end and thus the piezoelectric ceramic vibrator is vibrated to generate charges.

JP 2005-318774 A JP 2002-171341 A

    However, with the conventional power generation device, sufficient power generation cannot be obtained in a mobile communication device such as a mobile phone.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a communication device power generator capable of obtaining sufficient power generation in a mobile communication device such as a mobile phone, and a communication device using the power generation device.

  The power generator for communication equipment of the present invention has a fixed part and a non-fixed part, and the non-fixed part is bent by acceleration to generate power, and the non-fixed part of the piezoelectric element is brought into contact with the non-fixed part. And an interference member for facilitating the bending deformation of the fixed portion.

  The power generator for communication equipment of the present invention is for the interference member to continuously contact, for example, the piezoelectric element.

  In the power generator for communication equipment according to the present invention, the interference member is a protruding portion that protrudes toward the piezoelectric element, for example.

  The communication device power generator of the present invention may further include a regulating member that regulates the maximum displacement position of the non-fixed portion.

  In the power generator for communication equipment of the present invention, the restriction member is formed of, for example, an elastic member.

  The power generator for communication equipment of the present invention further includes, for example, a support member that supports the piezoelectric element so as to be able to bend and deform. The support member has a first surface to which the fixing portion is connected and a second surface on which the restricting member is provided. Preferably, the second surface is displaced in the thickness direction of the piezoelectric element with respect to the first surface.

  In the power generator for communication equipment according to the present invention, the connecting portion between the piezoelectric element and the support member is coated with, for example, an insulating resin.

  In the power generator for communication equipment according to the present invention, the interference member is disposed along the circumferential direction of a rotating shaft that is rotated by, for example, an externally input load, and moves in the circumferential direction by the rotation of the rotating shaft. Includes fins.

  The communication device of the present invention includes the power generator for the communication device.

  According to the present invention, it is possible to efficiently generate power by utilizing the bending deformation of the piezoelectric element.

It is a schematic block diagram for demonstrating an example of the portable communication apparatus which concerns on this invention. It is a top view for demonstrating the electric power generating apparatus which concerns on the 1st Embodiment of this invention. It is sectional drawing which follows the III-III line of FIG. It is a perspective view which shows an example of the piezoelectric element used in the electric power generating apparatus shown in FIG. FIG. 5 is an exploded perspective view of the piezoelectric element shown in FIG. 4. It is a perspective view which shows the other example of the piezoelectric element used in the heat generating apparatus which concerns on this invention. FIG. 5 is an exploded perspective view of the piezoelectric element shown in FIG. 4. It is sectional drawing for demonstrating the other example of the connection method of the piezoelectric element with respect to a support substrate. It is a perspective view which shows the mobile telephone which is an example of the portable communication apparatus of this invention. It is a top view for demonstrating the other example of the handle | steering-wheel in the electric power generating apparatus shown in FIG. It is a perspective view for demonstrating operation | movement of an electric power generating apparatus. It is a perspective view which shows the electric power generating apparatus which concerns on the 2nd Embodiment of this invention. It is sectional drawing of the electric power generating apparatus shown in FIG. It is a perspective view which shows the example which applied the electric power generating apparatus shown in FIG. 12 to the mobile phone. It is a top view of the electric power generating apparatus shown in FIG. It is sectional drawing for demonstrating the electric power generating apparatus which concerns on the 3rd Embodiment of this invention. It is sectional drawing for demonstrating operation | movement of the electric power generating apparatus shown in FIG. It is sectional drawing for demonstrating operation | movement of the electric power generating apparatus shown in FIG.

  Hereinafter, examples of embodiments of the power generator for communication equipment and the communication equipment according to the present invention will be described.

  The mobile communication device 1 shown in FIG. 1 is capable of communication using voice or characters and is portable. Examples of the mobile communication device 1 include a mobile information terminal such as a mobile phone, a PHS (Personal Handy-phone System), a PDA (Personal Digital Assistant), and a pager. The portable communication device 1 is capable of charging from outside and generating power inside the device, and includes a power generation device 2, a rectifier circuit 3, a changeover switch 4, a connector 5, a charging IC 6 and a secondary battery 7. .

  As shown in FIGS. 2 and 3, the power generation device 2 generates electric charges using the piezoelectric effect, and includes a piezoelectric element 20, a support member 21, a handle 22, and a rotating body 23.

  The piezoelectric element 20 generates an electric charge by strain deformation, and is connected to the support member 21 at an end portion 20A as a fixed portion. As shown in FIGS. 4 and 5, the piezoelectric element 20 is formed in a rectangular plate shape having, for example, a width dimension W of 1 to 5 mm, a length dimension L of 5 to 19 mm, and a thickness dimension T of 100 to 500 μm. . The piezoelectric element 20 includes a plurality of piezoelectric ceramics 24A and 24B, surface electrodes 25A and 25B, via conductors 26A and 26B, and terminals 27A and 27B.

  The piezoelectric ceramics 24A and 24B generate electric charges by bending deformation and are formed in a rectangular plate shape. The piezoelectric ceramics 24A and the piezoelectric ceramics 24B have different polarization directions, and are alternately stacked via the surface electrodes 25A and 25B. The number of stacked piezoelectric ceramics 24A and 24B may be determined within a range in which a desired strength and power generation can be obtained within a range in which bending deformation is possible, for example, about 2 to 20.

  These piezoelectric ceramics 24A and 24B include, for example, lead zirconate titanate (PZT), lead titanate (PT), barium titanate (BT), bismuth (Bi) layered compound, tungsten bronze compound or niobium (Nb) acid. It is formed of a compound having a perovskite structure such as an alkali compound. The polarization characteristics of the piezoelectric ceramics 24A and 24B are obtained, for example, by applying a DC electric field of 3 kV / mm to 7 kV / mm in silicon oil at a temperature of 70 ° C. to 90 ° C. for 10 minutes to 30 minutes. Can do.

  The surface electrodes 25A and 25B are used for extracting charges from the piezoelectric ceramics 24A and 24B, and are formed on the surfaces of the piezoelectric ceramics 24A and 24B. These surface electrodes 25A and 25B include main body portions 25Aa and 25Ba and lead portions 25Ab and 25Bb. The main body portions 25Aa and 25Ba are for taking out charges from the piezoelectric ceramics 24A and 24B. The lead portions 25Ab and 25Bb are for leading charges from the main body portions 25Aa and 25Ba to the terminals 27A and 27B, and are formed to extend from the end portions of the main body portions 25Aa and 25Ba.

  Such surface electrodes 25A and 25B can be formed by a known film formation method using a material having high electrical conductivity. As a material having high electrical conductivity, for example, gold, silver, copper, brass or palladium can be used. As a film forming method, a screen printing method, a dipping method, or the like can be employed. The surface electrodes 25A and 25B can also be formed by adhering a metal plate such as brass via an adhesive such as an epoxy adhesive.

  The via conductors 26A and 26B are for electrically connecting the surface electrodes 25A and 25B formed on the piezoelectric ceramics 24A and 24B having the same polarization direction. These via conductors 26A and 26B are formed so as to penetrate in the thickness direction of the piezoelectric ceramics 24A and 24B, and are connected to the surface electrodes 25A and 25B at lead portions 25Ab and 25Bb. The via conductors 26A and 26B can be formed, for example, by forming a through hole at a predetermined position of the piezoelectric ceramics 24A and 24B and then filling a conductor paste by screen printing or the like.

  The terminals 27A and 27B are portions for taking out charges from the piezoelectric element 20. The terminals 27A and 27B are connected to the lead portions 25Ab and 25Bb of the surface electrodes 25A and 25B, and are connected to the rectifier circuit 3 via a support member 21 described later.

  As shown in FIGS. 6 and 7, the piezoelectric element 20 may have terminals 27A and 27B formed on the end face 20B. In such a piezoelectric element 20, the lead portions 25Ab and 25Bb in the surface electrodes 25A and 25B are formed up to the end face 20B in the piezoelectric ceramics 24A and 24B, and then the end faces 20B of the piezoelectric element 20 are electrically connected to the lead portions 25Ab and 25Bb. It can be obtained by forming the terminals 27A and 27B. In the illustrated example, the terminals 27A and 27B are also formed on the surfaces of the piezoelectric ceramics 24A and 24B located in the outermost layer. However, the terminals 27A and 27B may be formed only on the end surface 20B.

  As shown in FIGS. 2 and 3, the support member 21 supports the piezoelectric element 20 so that the piezoelectric element 20 can be bent and deformed at the end 20 </ b> A of the piezoelectric element 20 (the end where the terminals 27 </ b> A and 27 </ b> B are formed). The support member 21 is a wiring board in which the wiring 30 is formed on at least the surface of the insulating base material. As an insulating base material, for example, an inorganic base material formed by firing an inorganic oxide such as alumina, or an organic base material formed by impregnating a thermosetting resin such as an epoxy resin or a polyimide resin into a woven fabric made of glass fiber or the like. A substrate can be used.

  The piezoelectric element 20 is connected to the support member 21 through the adhesive layer 28 at the end 20A. The adhesive layer 28 is formed of a thermosetting resin such as an epoxy resin or a polyimide resin. The piezoelectric element 20 is further electrically connected to the wiring 30 of the support member 21 via the wire 29 at the terminals 27A and 27B. The connection using the wire 29 can be performed by a known wire bonding technique using a metal wire such as gold.

  As shown in FIG. 8, the piezoelectric element 20 may be conductively connected with the terminals 27 </ b> A and 27 </ b> B facing the wiring 30 of the support member 21. In this case, the terminals 27A and 27B and the wiring 30 may be connected using, for example, solder, anisotropic conductive resin, isotropic conductive resin, or conductive resin.

  As shown in FIGS. 2 and 3, the connecting portion between the support member 21 and the piezoelectric element 20 is covered with an insulating sealing portion 32. Thus, if a connection part is covered by the insulation sealing part 32, the intensity | strength of a connection part can be raised. Therefore, even when the piezoelectric element 20 is repeatedly bent and deformed, the piezoelectric element 20, the wiring 30, the wire 29, and the connection portion are prevented from peeling off, or the piezoelectric element 20 is prevented from peeling off from the support member 21. be able to.

  The insulating sealing portion 32 is preferably sealed including the terminals 27 </ b> A and 27 </ b> B of the piezoelectric element 20 and the wire 29. Then, since corrosion of the wire 29 and the terminals 27A and 27B can be suppressed, it is possible to improve the reliability of electrical connection between the piezoelectric element 20 and the support member 21. Such an insulating sealing portion 32 can be formed by solidifying the resin after applying a thermosetting resin or a thermoplastic resin to the target portion. As the thermosetting resin for the insulating sealing portion 32, for example, an epoxy resin or a polyimide resin can be used. As the thermoplastic resin for the insulating sealing portion 32, for example, an acrylic resin can be used.

  As shown in FIG. 2, the handle 22 is for rotating the rotating body 23, and includes a rotating shaft 22A, a connecting arm 22B, and an operating arm 22C. As illustrated in FIG. 9, the handle 22 is configured so that when the power generation device 2 (see FIGS. 2 and 3) generates power, the operation arm 22 </ b> C is connected to the mobile phone 8 (mobile communication). It is in a state of protruding from the device 1).

  As shown in FIGS. 2 and 3, the rotating shaft 22A is for moving a plurality of fins 23B of the rotating body 23, which will be described later, on a predetermined circumferential trajectory, and a support ring for the rotating body 23, which will be described later. It is non-rotatably fitted to 23A. The rotating shaft 22A is movable relative to the axial direction. Therefore, the handle 22 as a whole including the connecting arm 22B and the operation arm 22C can be moved relative to the housing 80 of the mobile phone 8 (see FIG. 9).

  The connection arm 22B transmits the rotation operation of the operation arm 22C to the rotation shaft 22A, and connects the rotation shaft 22A and the operation arm 22C. The connecting arm 22B is formed integrally with the rotating shaft 22A, and can be relatively moved together with the rotating shaft 22A in the axial direction of the rotating shaft 22A. For example, the connecting arm 22 </ b> B can select a state positioned in a recess 81 (see FIG. 9) provided in the housing 80 of the mobile phone 8 and a state positioned outside the housing 80.

  The operation arm 22C is a portion operated by the user when rotating the rotating shaft 22A and then the rotating body 23 (when generating electric power by bending and deforming the piezoelectric element 20). The operation arm 22C is fixed so as to be rotatable with respect to the connection arm 22B. The operation arm 22C has an extended state positioned in the same straight line as the connection arm 22B and a state bent substantially perpendicular to the connection arm 22B. You can choose. The operating arm 22C is bent substantially perpendicularly to the connecting arm 22B when the power generation device 2 generates power. On the other hand, the operating arm 22C is extended with respect to the connecting arm 22B when not in use. In the mobile communication device 1 such as the mobile phone 8, if the connecting arm 22 </ b> B is in the extended state, the handle 22 does not become bulky, so that convenience when the handle 22 is accommodated is improved.

  In addition to the fact that the operation arm 22C can be extended, the handle 22 can be moved relative to the casing 80 of the mobile phone 8 as a whole as described above. Therefore, the entire handle 22 can be accommodated in the recess 81 (see FIG. 9) of the housing 80 of the mobile phone 8, and the convenience when accommodating the handle 22 is further enhanced.

  As shown in FIG. 10, the handle 22 can select a state in which the operation arm 22C is folded with respect to the connection arm 22B and a state in which the operation arm 22C is bent substantially perpendicular to the connection arm 22B. The structure which can be used may be sufficient. Also in the handle 22, the convenience when the handle 22 is accommodated is enhanced by folding the operation arm 22 </ b> C.

  Although the mobile communication device 1 such as the mobile phone 8 described above has a form in which the handle 22 is incorporated, the handle 22 separated from the mobile communication device 1 is portable when the power generation apparatus 2 generates power. It may be configured to be attached to the communication device 1.

  As shown in FIGS. 2, 3, and 11, the rotating body 23 is for bending and deforming the piezoelectric element 20 by operating the handle 22, and includes a support ring 23 </ b> A and a plurality of fins 23 </ b> B.

  The support ring 23A supports the plurality of fins 23B so that the fins 23B can move in the circumferential direction. The support ring 23A is fixed to a rotation shaft 22A of the handle 22, and can be rotated together with the rotation shaft 22A (handle 22).

  The plurality of fins 23 </ b> B function as interference members for causing interference with the piezoelectric element 20. The plurality of fins 23B are arranged side by side along the circumferential direction on the peripheral surface of the support ring 23A. These fins 23B move on a circular locus along the circumferential direction of the support ring 23A when the operation arm 22C is rotated. On this circular locus, a free end 20C as an unfixed portion of the piezoelectric element 20 is located. Therefore, the plurality of fins 23B repeatedly interfere with the free end 20C of the piezoelectric element 20 due to the movement in the circumferential direction.

  The rectifier circuit 3 shown in FIG. 1 is for converting an alternating current obtained from the piezoelectric element 20 into a direct current. As the rectifier circuit 3, various known circuits such as a full bridge circuit or a current doubler circuit can be applied.

  The connector 5 is a part to which the AC adapter 50 is attached when the secondary battery 7 is charged. The AC adapter 50 is connected to, for example, an outlet, and the secondary battery 7 is charged with electric charge via the AC adapter 50 and the connector 5.

  The charging IC 6 converts the current (voltage) supplied from the power generation device 2 or the AC adapter 50 into a constant current (constant voltage).

  The secondary battery 7 is for storing a current supplied from the power generation device 2 or the AC adapter 50 and is chargeable / dischargeable. As the secondary battery 7, various known batteries such as a lithium ion battery can be used.

  The changeover switch 4 selects a state in which power is supplied from the power generation device 2 to the secondary battery 7 and a state in which power is supplied from the connector 5. The change-over switch 4 is normally in a state in which charging via the connector 5 is possible. On the other hand, when the secondary switch 7 is charged from the power generator 2, the changeover switch 4 is in a state of being electrically connected to the power generator 2 and the secondary battery 7 via the rectifier circuit 3. Switching of the charging source by the changeover switch 4 is performed in conjunction with, for example, the operation of the handle 22 of the power generation device 2. More specifically, when the change-over switch 4 is in a state in which the power generation device 2 can be used, for example, the handle 22 is pulled and the connection arm 22B and the operation arm 22C protrude from the housing 80 (see FIG. 9). In the process, the changeover switch 4 is switched. Such switching of the changeover switch 4 may be one in which the switch is mechanically switched as the handle 22 is moved, or a signal for switching the changeover switch 4 is generated by the movement of the handle 22. Also good. Of course, the changeover switch 4 may be switched by operating a switch provided in the mobile communication device 1 such as the mobile phone 8.

  In the mobile communication device 1 described above, communication by voice or text can be performed using the secondary battery 7 as a power source. When charging the secondary battery 7 in the mobile communication device 1, the AC adapter 50 connects between the connector 5 and the outlet. On the other hand, when the secondary battery 7 runs out at the destination or the like, the secondary battery 7 can be charged using the power generation device 2. Charging using the power generation device 2 is performed, for example, by switching the changeover switch 4 to a state where charging from the power generation device 2 to the secondary battery 7 is possible when the handle 22 is pulled out and rotating the handle 22.

  The handle 22 is rotated in a state where the operation arm 22C is bent substantially perpendicular to the connection arm 22B. When the operation arm 22C is rotated, the rotating shaft 22A rotates and the support ring 23A also rotates. Since the plurality of fins 23B are fixed to the support ring 23A, these fins 23B move on a circular locus along the rotation direction of the operation arm 22C. Since the free end 20C of the piezoelectric element 20 is located on the circular locus, the plurality of fins 23B repeatedly interfere with the free end 20C of the piezoelectric element 20. That is, when one fin 23B interferes with the free end 20C of the piezoelectric element 20, the free end 20C of the piezoelectric element 20 moves together with the fin 23B, so that the free end 20C of the piezoelectric element 20 is bent and deformed.

  When the fin 23B interfering with the piezoelectric element 20 moves a certain distance, the engagement between the fin 23B and the piezoelectric element 20 is released, and the piezoelectric element 20 tends to bend and deform in the opposite direction. At this time, the next fin 23 </ b> B interferes with the free end 20 </ b> C of the piezoelectric element 20. As a result, the rotation of the operation arm 22C causes the plurality of fins 23B to successively interfere with the free end 20C of the piezoelectric element 20, and the piezoelectric element 20 repeats bending deformation. When the piezoelectric element 20 is bent and deformed, the charges generated in the piezoelectric ceramics 24A and 24B in the piezoelectric element 20 move to the surface electrodes 25A and 25B. This electric charge is guided to the terminals 27A and 27B through the conductor vias 26A and 26B. The electric charge from the piezoelectric element 20 is converted into a direct current in the rectifier circuit 3, then is subjected to constant electrosulfation (constant voltage) in the charging IC 6, and then stored in the secondary battery 7. The charge from the piezoelectric element 20 may be supplied directly to the IC or device of the mobile phone 8 without charging the secondary battery 7.

  Thus, in the electric power generating apparatus 2, since the piezoelectric element 20 is repeatedly bent and deformed by repeated interference by the plurality of fins 23B, electric power can be generated efficiently.

  Next, a second embodiment of the present invention will be described with reference to FIGS. In these drawings, the same members or elements as those of the power generation apparatus 2 described above are denoted by the same reference numerals, and redundant description below will be omitted.

  The power generation device 2 illustrated in FIGS. 12 and 13 is configured to bend and deform the piezoelectric element 20 using a linear member 33 instead of the handle 22. The power generation device 2 includes a rotating body 23, a linear body 33, and a return spring 34.

  As shown in FIGS. 12 and 13, the rotating body 23 is the same as the power generation device 2 described above. A rotating shaft 22A is fixed to the rotating body 23, and is rotated by the rotation of the rotating shaft 22A.

  This is for rotating the rotating body 23 using the linear body 33 and the return spring 34, for example, a string or a wire. It is preferable that the linear member 33 can be folded so as not to be bulky. For example, as shown in FIGS. 14 and 15, the linear body 33 is housed in the recessed portion 81 of the housing 80 in a folded state in the mobile communication device 1 such as the mobile phone 8. A block 35 is fixed to the linear body 33. The block 35 is attached to the opening 83 of the housing 80 when the power generation device 2 is not used, and is removed from the opening 83 when the power generation device 2 is used. In such a configuration, when the block 35 is removed from the opening 83, the changeover switch 4 (see FIG. 1) may be switched so that the electric charge from the power generation device 2 can be supplied to the secondary battery 7. If the changeover switch 4 is switched by removing the block 35, it is convenient because the charge from the power generation device 2 is supplied to the secondary battery 7 by the operation required when using the power generation device 2. is there. Of course, the changeover of the change-over switch 4 (see FIG. 1) does not necessarily have to be interlocked with the removal operation of the block 35.

  The return spring 34 is for pulling the filament 33 and returning it to its original position. The return spring 34 is constituted by a mainspring spring. One end of the return spring 34 is fixed to the rotating shaft 22 </ b> A, and the other end is connected to the linear member 33. The return spring 34 may be another spring such as a leaf spring or a coil spring instead of the mainspring spring, and an elastic body other than the spring may be used instead of the return spring 34.

  Next, the operation of the power generation device 2 will be described using the mobile phone 8 (see FIG. 14) as an example. When power generation is performed by the power generation device 2, the block 35 is first removed from the opening 83 of the housing 80. Thereby, the changeover switch 4 (see FIG. 1) is switched to a state in which the electric charge of the secondary battery 7 can be supplied from the power generation device 2.

  When driving the electric power generating apparatus 2, the filament 33 is pulled. Thereby, the rotating shaft 22A is rotated, and the plurality of fins 23B are rotated. At this time, elastic force is stored in the return spring 34. As the plurality of fins 23 </ b> B rotate, the plurality of fins 23 </ b> B repeatedly interfere with the piezoelectric element 20. Thereby, the piezoelectric element 20 is repeatedly bent and deformed, and the charge from the piezoelectric element 20 is charged to the secondary battery 7 via the rectifier circuit 3 and the charging IC 6 (see FIG. 1). The charge from the piezoelectric element 20 may be supplied directly to the IC or device of the mobile phone 8 without charging the secondary battery 7.

  On the other hand, after pulling the filament 33 for a certain distance, the pulling force acting on the filament 33 is released. Then, the return spring 34 returns to the original state by the elastic force of the return spring 34. At this time, the linear member 33 is also pulled back toward the housing 80. Therefore, in the power generation device 2, by repeatedly pulling the linear body 33 and releasing the tensile force to the linear body 33, the rotating body 23 can be rotated, and the plurality of fins 23 </ b> B can repeatedly interfere with the piezoelectric element 20. it can. Therefore, since the piezoelectric element 20 is repeatedly bent and deformed by repeated interference by the plurality of fins 23B, power can be generated efficiently.

  Next, a third embodiment of the present invention will be described with reference to FIGS. In these drawings, the same members or elements as those of the power generation apparatus 2 described above are denoted by the same reference numerals, and redundant description below will be omitted.

  The power generation device 2 bends and deforms the piezoelectric element 20 by vibration applied from the outside. This power generation device 2 does not employ the rotating body 23 like the power generation device 2 described above, and includes a protruding portion 90 and a regulating member 91 instead.

  The protrusion 90 corresponds to an interference member, and interferes with the piezoelectric element 20 when the piezoelectric element 20 is bent and deformed. The projecting portion 90 interferes with the piezoelectric element 20 at a portion deviated from the free end 20 </ b> C, and is formed to project toward the piezoelectric element 20.

  The regulating member 91 regulates the maximum displacement position of the free end 20 </ b> C of the piezoelectric element 20. The regulating member 91 is provided on the second surface 21B that is displaced in the thickness direction of the piezoelectric element 20 with respect to the first surface 21A to which the piezoelectric element 20 is connected, and is formed of, for example, an elastic member. The first surface 21 </ b> A and the second surface 21 </ b> B are set on the support member 21.

  In the power generation device 2, the piezoelectric element 20 is bent and deformed, for example, by vibrating the housing in a mobile phone. At this time, when the piezoelectric element 20 is displaced upward, the projecting portion 90 interferes with a portion deviated from the free end 20C of the piezoelectric element 20, and when the piezoelectric element 20 is displaced downward, the free end 20C acts on the regulating member 91. have a finger in the pie.

  When the protrusion 90 interferes with the piezoelectric element 20, the displacement of the interference portion is limited by the protrusion 90. On the other hand, the displacement of the free end 20 </ b> C is performed without being limited by the protrusion 90. At this time, the acceleration of the free end 20 </ b> C increases due to interference with the protrusion 90. Therefore, in the power generation device 2, since the acceleration when the piezoelectric element 20 vibrates is increased, the power generation efficiency is high.

  On the other hand, when the piezoelectric element 20 interferes with the regulating member 91, vibration energy of the piezoelectric element 20 is absorbed by the regulating member 91. Therefore, it is possible to suppress the piezoelectric element 20 from excessively swinging more than necessary. Therefore, by providing the restricting member 91, the stress acting on the connection portion between the piezoelectric element 20 and the support member 21 can be relieved, and damage to the tip (free end 20C) of the piezoelectric element 20 can be suppressed. .

  The present invention is not limited to the above-described embodiments, and various changes or improvements can be made without departing from the scope of the present invention.

  For example, the support structure of the piezoelectric element in the power generation apparatus may be configured to support both ends of the piezoelectric element instead of supporting only one end of the piezoelectric element. Further, the piezoelectric element only needs to be flexible, and is not limited to a quadrangle. For example, a circular element such as an ellipse, an ellipse or a perfect circle, or a polygon other than a square can be used.

  The electric charge obtained in the power generation apparatus is not necessarily stored in the secondary battery. For example, a power storage unit different from the secondary battery may be prepared and stored in the power storage unit. Since such a power storage unit does not necessarily require a large amount of stored power, a capacitor can be used as the power storage unit. In addition, in the secondary battery, in addition to the portion that stores the charge from the AC adapter, a portion that stores the charge from the power generation device may be provided separately.

  In the above-described embodiment, the method for manufacturing a piezoelectric element in which a plurality of piezoelectric ceramics are stacked has been described. However, the present invention is not limited to this. For example, a green sheet is prepared using a doctor blade method. And after laminating | stacking several green sheets in which the via conductor was formed, you may form a piezoelectric element by baking this laminated body simultaneously.

DESCRIPTION OF SYMBOLS 1 Portable communication apparatus 2 Power generation device 20 Piezoelectric element 20A Fixed end (fixed part)
20C Free end (non-fixed part)
21 Support member 21A First surface (of support member) 21B Second surface (of support member) 22B Rotating shaft 23 Rotating body 23B Fin (interference member)
90 Protrusion (interference member)
91 Restriction member

Claims (9)

A piezoelectric element having a fixed part and a non-fixed part, wherein the non-fixed part bends due to acceleration;
An interference member that is in contact with the non-fixed portion of the piezoelectric element and promotes bending deformation of the non-fixed portion;
A power generator for communication equipment.   The power generator for communication equipment according to claim 1, wherein the interference member is for continuously contacting the piezoelectric element.   The power generator for communication equipment according to claim 1, wherein the interference member is a projecting portion that projects toward the piezoelectric element.   The power generator for communication equipment according to claim 1, further comprising a regulating member that regulates a maximum displacement position of the non-fixed portion.   The power generator for communication equipment according to claim 4, wherein the regulating member is formed of an elastic member. A support member that supports the piezoelectric element so as to be able to bend and deform;
The support member has a first surface to which the fixing portion is connected, and a second surface on which the restriction member is provided,
The power generator for communication equipment according to claim 4, wherein the second surface is displaced in the thickness direction of the piezoelectric element with respect to the first surface.   The power generator for communication equipment according to claim 1, wherein a connection portion between the piezoelectric element and the support member is coated with an insulating resin.   The said interference member is arrange | positioned along the circumferential direction of the rotating shaft rotated by the load input from the outside, and contains the several fin which moves to the said circumferential direction by rotation of the said rotating shaft. Power generator for communication equipment.   A communication device comprising the power generator for communication device according to claim 1.

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