Patent Translate Powered by EPO and Google Notice This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate, complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or financial decisions, should not be based on machine-translation output. DESCRIPTION JP2018116702 Abstract: The present invention provides an electronic device provided with a piezoelectric vibrating member capable of making the thickness of the electronic device thinner than conventional. SOLUTION: A vibration generating member 3 attached to the back surface of a liquid crystal touch input panel 10 is a conductive diaphragm 30, a surface electrode layer 42 connected to the conductive diaphragm 30, and a piezoelectric element having a surface electrode layer 42 provided on the surface. A piezoelectric vibrating element 40 having a back surface electrode layer 46 provided on the back surface of the piezoelectric element 44 and a circuit board 20 having a surface side wiring pattern 24 including a surface wiring 25 on the surface fixed to the liquid crystal touch input panel 10; Have. The through conductive portion 21 connecting the back electrode layer 46 of the piezoelectric vibrating element 40 and the front surface wiring 25 of the circuit board 20 is provided. The penetrating conductive portion 21 is electrically insulated from the attachment electrode 27 to which the conductive diaphragm 30 is connected via the conductive bonding layer 32, the conductive diaphragm 30, and the surface electrode layer 42 of the piezoelectric vibrating element 40, The central portion of the circuit board 20 and the piezoelectric vibrating element 40 is penetrated. [Selected figure] Figure 2 Electronic device provided with vibration generating member [0001] The present invention relates to an electronic device in which a vibration generating member is attached to the back surface of a panel member. [0002] Japanese Patent No. 5421500 (Patent Document 1) discloses an electronic device which is 11-05-2019 1 provided with a vibrating portion on the back surface side of a panel member, vibrates this vibrating portion in a predetermined mode, and transmits this vibration to the panel member. There is. [0003] Moreover, the electronic device which vibrates a panel member is disclosed by UnexaminedJapanese-Patent No. 2005-510815 (patent document 2) using a piezoelectric vibration member for a vibration part. [0004] Further, Japanese Patent No. 4426738 (Patent Document 3) discloses an electronic apparatus (piezoelectric speaker system) in which an audible sound is generated from a panel member vibrated by a piezoelectric vibrating member to make the panel member a speaker. [0005] Patent No. 5421500 Japanese Patent Application Laid-Open No. 2005-510815 Patent No. 4426738 [0006] In conventional electronic devices that vibrate panel members, there is always a desire to reduce the thickness of the entire device. However, the structure of the electronic device using the conventional piezoelectric vibration member as a vibration source can not meet this demand. [0007] An object of the present invention is to provide an electronic device provided with a piezoelectric vibrating member capable of making the thickness of the electronic device thinner than conventional. [0008] 11-05-2019 2 An electronic device to be improved by the present invention is an electronic device provided with a panel member, a vibration generating member attached to the back surface of the panel member to vibrate and a vibration control unit for controlling the vibration of the vibration generating member. It is. In the present invention, the vibration generating member includes a conductive diaphragm, a surface electrode layer electrically connected to the conductive diaphragm, a piezoelectric element having a surface electrode layer provided on the surface, and a surface electrode on the back surface of the piezoelectric element. A plurality of piezoelectric vibrating elements having a back electrode layer provided so as to face the layer, and conductivity of the plurality of piezoelectric vibrating elements having a front side wiring pattern on the surface fixed to the panel member A circuit board having a back side wiring pattern including a plurality of attachment electrodes connected with a diaphragm via a conductive bonding layer, a conductive diaphragm and a surface electrode layer of a piezoelectric vibrating element, and an attachment electrode of the circuit board electrically In the insulated state, the circuit board and the central portion of the piezoelectric vibration element are penetrated, and a through connection structure portion connecting the back electrode layer of the piezoelectric vibration element and the surface electrode layer of the circuit board is provided. [0009] According to the present invention, since the through connection structure portion is provided, in order to connect the back surface electrode layer of the piezoelectric vibration element and the surface electrode layer of the circuit board, it is necessary to provide the lead wire for connection outside the piezoelectric vibration element It disappears. As a result, the electronic device can be made thinner than before. [0010] When the panel member is a touch input panel member with which the user touches the surface, the vibration control unit causes the vibration generating member to vibrate at a frequency that does not generate an audible sound from the touch input panel, thereby causing a touch in conjunction with the touch. Since the input panel member can be vibrated, only a click can be given to the person making the touch. 11-05-2019 3 [0011] When the panel member is a display panel member that displays an image or a video, the vibration control unit vibrates the vibration generating member at a frequency that generates an audible sound from the display panel to use the display panel member as a speaker. can do. [0012] The outer peripheral contours of the conductive diaphragm, the front electrode layer, the piezoelectric element and the back electrode layer may have a concentric disk shape. If such a configuration is adopted, a piezoelectric vibrating member can be configured at low cost using a piezoelectric vibrating element that can be used for an existing piezoelectric buzzer or the like. [0013] In the mounting electrode, the conductive diaphragm, and the surface electrode layer, the through connection structure and the main body of the mounting electrode, the main body of the conductive diaphragm, and the main surface of the surface electrode layer are electrically separated around the through connection structure. Annular separation grooves are formed respectively. When such a configuration is adopted, it is possible to reliably prevent the occurrence of a short circuit when forming the through connection structure. [0014] It is preferable that a plurality of through holes or through grooves into which the bonding agent forming the conductive bonding layer enters are dispersedly formed in the main body portion of the mounting electrode. 11-05-2019 4 According to this structure, the bonding agent can be introduced into the dispersed through holes or through grooves to enhance the bonding strength. [0015] When a multilayer circuit board having an internal wiring pattern inside is used as a circuit board, it is preferable that a ground conductive layer is further provided on the back surface of the multilayer circuit board via an insulating layer. When such a ground conductive layer is provided, the conductive layer exhibits a shielding effect. [0016] The touch input panel member may be an electrostatic touch input panel. [0017] When the plurality of mounting electrodes of the circuit board are arranged to form a plurality of electrode rows and two or more electrode rows, the vibration control unit is configured to keep the touch input panel member touched for a predetermined time for the same time. The operation of vibrating a plurality of piezoelectric vibrating elements included in an electrode row in the same phase and vibrating a plurality of piezoelectric vibrating elements included in an adjacent other electrode row in a phase opposite to the same phase is phased every fixed cycle Can be changed. Thus, the touch input panel member can be vibrated as a whole. [0018] Further, in the case where the plurality of attachment electrodes of the circuit board are arranged to form a plurality of electrode rows and two or more electrode rows, the vibration control unit causes a predetermined change when the user touches the touch input panel 11-05-2019 5 member. The operation of driving the plurality of piezoelectric vibrating elements can be performed with the phase being changed at a constant cycle so that two piezoelectric vibrating elements adjacent in time, row direction or column direction vibrate in opposite phases. Thus, the touch input panel member can be vibrated as a whole. [0019] What is used as a speaker is an in-phase drive mode in which the sound pressure is maximized. There is a certain degree of vibration, and the small sound is the two-row drive mode in which the phase of the two rows is alternated. The drive mode may be selected according to the application. [0020] As described above, according to the electronic device provided with the vibration generating member according to the present invention, since the through connection structure portion is provided, the thickness of the electronic device can be thinner than in the conventional case. [0021] FIG. 2 is a cross-sectional view showing a layered configuration of an embodiment of an electronic device provided with a vibration generating member according to the present invention, and dimensions such as thickness of each layer are appropriately changed for the sake of description (FIG. 2) The same goes for the following). It is an expanded cross-sectional view of the electronic device of FIG. It is the cross-sectional view which further expanded the circuit board part of embodiment of the electronic device provided with the vibration generation member of this invention. (A), (B) and (C) respectively show a perspective view and an exploded perspective view of a state in which a part of the vibration generating member including the piezoelectric vibrating element of FIG. It is a disassembled perspective view. (A) is a cross-sectional view similar to FIG. 3 of the circuit board part in other embodiment of this invention, (B) is a cross-sectional view of the modification of FIG. 5 (A). (A), (B), (C) and (D) respectively show a perspective view and an exploded perspective view of a state in which a part of a vibration generating member including another piezoelectric vibrating 11-05-2019 6 element is cut from the back side, and They are the disassembled perspective view seen from the side, and the perspective view seen from the surface side. It is a figure which shows the example which arrange ¦ positioned several piezoelectric vibration elements on the circuit board. (A) And (B) is a vibration distribution figure of the touch input panel member at the time of driving the embodiment of FIG. 1 using the circuit board of FIG. 7 by waveform drive mode. (A) And (B) is a vibration distribution figure of the touch input panel member at the time of driving the embodiment of FIG. 1 using the circuit board of FIG. 7 by a zigzag drive mode. [0022] Hereinafter, an embodiment of an electronic device provided with a vibration generating member according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing the configuration of an electronic device 1 equipped with a vibration generating member according to the present invention. Specifically, this electronic device is a portable terminal such as a notebook computer, and FIG. It is a cross section of a display part. FIG. 2 shows a cross-sectional view of the main part of the piezoelectric vibrating member 3. In FIG. 1 and FIG. 2, hatching indicating that it is a cross section is omitted. [0023] In FIG. 1, the liquid crystal touch input panel 10 is exposed on the surface of the electronic device, and the circuit board 20, the conductive diaphragm 30, and the piezoelectric vibrating element 40 are sequentially stacked from the surface side in the lower layer on the back side. The configured vibration generating member 3 is configured. The liquid crystal touch input panel 10 has a capacitive touch switch function. The vibration generating member 3 is attached to the back surface of the liquid crystal touch input panel 10 so as to be able to transmit the vibration to the liquid crystal touch input panel 10. [0024] A plate-shaped damper 11 is provided below the vibration generating member 3, a metal bottom plate 12 is provided below the plate-like damper, and a synthetic resin base 13 is provided below the vibration generating member 3 to form a housing of the electronic device together with the frame 15. There is. Protruding dampers 14 are provided on the plate-like dampers 11 so as to protrude upward, and in each of the dampers 11 and 14, the liquid crystal touch input panel 10 11-05-2019 7 is excessively deformed or the vibration generating member is rapidly vibrated by an external force. To prevent the occurrence of damage or accidents caused by The thickness of the frame 15 is adjusted so that the gaps in the stacking direction of the dampers 11 and 14 have appropriate sizes. [0025] The conductive diaphragm 30 of the vibration generating member 3 is a thin plate made of brass, and a vibration control unit (not shown) generates an output signal to transmit the vibration to the liquid crystal touch input panel 10 when the piezoelectric vibration element 40 vibrates. . [0026] In the present embodiment, the liquid crystal touch input panel 10 is a display panel / touch input panel, and the vibration control unit (not shown) vibrates the vibration generating member 3 at a frequency that does not generate an audible sound from the liquid crystal touch input panel 10. In conjunction with the touch, the liquid crystal touch input panel 10 is vibrated to give a click feeling to the person making the touch. When the vibration control unit vibrates the vibration generating member 3 at a frequency that generates an audible sound from the liquid crystal touch input panel 10, the liquid crystal touch input panel 10 can be used as a speaker. [0027] As shown in FIG. 2, the piezoelectric vibrating element 40 is provided on the piezoelectric element 44, the surface electrode layer 42 provided on the front side of the piezoelectric element 44, and the back surface of the piezoelectric element 44 so as to face the surface electrode layer 42. And the back electrode layer 46. The front electrode layer 42 is electrically connected to the conductive diaphragm 30. The piezoelectric element 44 is made of lead zirconate titanate (PZT), and the front electrode layer 42 and the back electrode layer 46 are formed by screen printing silver paste on both sides of the piezoelectric element 44 or depositing silver. . [0028] 11-05-2019 8 In the present embodiment, the circuit board 20 is configured by forming a copper foil wiring pattern on both sides of the plate-like insulating layer 22. That is, the wiring patterns on both sides are the surface wiring pattern 24 printed on the surface fixed to the liquid crystal touch input panel 10 and the back surface wiring pattern to which the conductive diaphragms 30 of the plurality of vibration generating units 3 are connected 26. The back side wiring pattern 26 and the conductive diaphragm 30 are connected via a conductive bonding layer 32 made of a conductive bonding material. [0029] Referring to the enlarged cross-sectional view shown in FIG. 3, a plurality of attachment electrodes 27 are formed on the back side wiring pattern 26. The mounting electrode 27 is connected to the conductive diaphragm 30 via the conductive bonding layer 32, and is further electrically connected to the surface electrode layer 42 of the piezoelectric vibrating element 40. As shown in FIGS. 2 and 4B, the mounting electrode 27 is formed with a plurality of through holes h dispersed. The plurality of through holes h are formed by etching of a copper foil. According to such a structure of the mounting electrode 27, the conductive bonding material enters the dispersed through holes h, and the bonding strength between the mounting electrode 27 and the conductive diaphragm 30 can be enhanced. [0030] As shown in FIG. 3, the portion of the back side wiring pattern 26 other than the attachment electrode 27 constitutes a back electrode lead 28. The back surface electrode lead 28 is connected to the back surface electrode layer 46 of the piezoelectric vibrating element 40 through the penetration conductive portion 29, the surface wiring 25, and the penetration conductive portion 21 constituting the penetration connection structure portion. [0031] The through conductive portion 21 shown in FIGS. 2 and 3 is formed by filling the through holes 50 with a conductive paste or the like, and reaches the back surface electrode layer 46 of the piezoelectric vibrating element 40 from the surface wiring 25 of the circuit board 20. The back 11-05-2019 9 surface electrode layer 46 and the surface wiring 25 of the circuit board 20 are connected. The through hole 50 passes through the circuit board 20, the conductive diaphragm 30, and the central portion of the piezoelectric vibrating element 40, and the through conductive portion 21 passes through the through hole. [0032] A ground conductive layer 23 is formed in a portion other than the surface wiring 25 of the surface side wiring pattern 24. When such a ground conductive layer 23 is provided, the ground conductive layer 23 exhibits a shielding effect. [0033] The vibration control unit is connected to the back surface electrode lead 28 and the mounting electrode 27 and vibrates the piezoelectric vibration element 40 by applying a drive voltage of a predetermined frequency between the front surface electrode layer 42 and the back surface electrode layer 46. . Thereby, the liquid crystal touch input panel 10 is vibrated through the conductive diaphragm 30 and the circuit board 20. The operator's touch on the liquid crystal touch input panel 10 is detected by a change in capacitance and is input to the vibration control unit. [0034] As shown in FIG. 4, the outer peripheral contours of the conductive diaphragm 30, the surface electrode layer 42, the piezoelectric vibrating element 40 and the back electrode layer 46 have a concentric disk shape. If such a configuration is adopted, the piezoelectric vibrating member 3 can be configured at low cost using a piezoelectric vibrating element that can be used for an existing piezoelectric buzzer or the like. [0035] Further, as shown in FIGS. 4A to 4C, in the mounting electrode 27, the conductive diaphragm 30, and the surface electrode layer 42, the through conductive portion 21 (shown in FIGS. 2 and 3) is 11-05-2019 10 formed around the through hole 50. (Not shown in FIG. 4), annular separation grooves 52, 54 and 56 for electrically separating the main body of the mounting electrode 27, the main body of the conductive diaphragm 30, and the main body of the surface electrode layer 42. Are formed respectively. By adopting such a configuration, it is possible to prevent the occurrence of a short circuit even if the penetrating conductive portion 21 is formed. [0036] FIG. 5A shows a cross-sectional view of a circuit board portion in another embodiment of the present invention. The circuit board portion shown in FIG. 5A performs the same function as the circuit board portion shown in FIG. 3 and is compatible as a constituent member of the vibration generating member. The circuit board 60 includes three insulating layers, that is, a surface insulating layer 62, an intermediate insulating layer 64, and a back surface insulating layer 66 in order from the front surface side. Wiring patterns are provided on both surfaces of each insulating layer and between layers, the surface of the surface insulating layer 62 is the ground conductive layer 70, and the surface insulating layer 62 and the intermediate insulating layer 64 are the surface side wiring pattern 71, the intermediate insulating layer An intermediate wiring pattern 72 is located between the back surface insulating layer 66 and the back surface insulating layer 66, and the back surface side wiring pattern 73 is the back surface of the back surface insulating layer 66. A mounting electrode 74 and a back surface electrode lead 75 are formed on the back surface side wiring pattern 73. The back surface electrode lead 75 is connected to the back surface electrode layer 46 of the piezoelectric vibrating element 40 through the penetration conductive portion 76, the surface wiring 77 of the surface side wiring pattern 71, and the penetration conductive portion 78. As shown in FIG. 5B, the ground conductive layer 70 of the circuit board portion of FIG. 5A may be removed. [0037] As shown in FIGS. 6A to 6D, the mounting electrode 74 has a slightly larger disc shape concentric with the outer peripheral contours of the conductive diaphragm 30 and the piezoelectric vibrating element 40, and penetrates around the penetrating conductive portion 78. An annular separation groove 79 is formed to electrically separate the conductive portion 78 and the main portion of the attachment electrode 74. [0038] Next, application to a portable terminal such as a notebook computer which is an electronic 11-05-2019 11 device according to the present embodiment will be described. On the surface of the liquid crystal touch input panel 10, which is a display of a notebook computer, buttons, keys, images and the like for the user to perform input by touching are displayed. A vibration control unit interlocked with a central control unit (not shown) of the personal computer that performs this display detects a position touched by the user on the electrostatic capacitance type liquid crystal touch input panel 10 from a change in electrostatic capacitance. Then, the central control unit is informed of information on the touched location, and the vibration control unit receives an instruction from the central control unit to vibrate each piezoelectric vibrating element 40, and liquid crystal touch input via the conductive diaphragm 30 and the circuit board 20 The panel 10 is vibrated. [0039] If the frequency for vibrating the liquid crystal touch input panel 10 is low enough not to generate an audible sound, the clicker is given a click feeling, and if it is high enough to generate an audible sound, the clicker is supplied to the toucher . If the portion touched is an error or a portion which can not be operated, in the present embodiment, there is an error or invalid operation in the user by giving a click feeling or a warning sound different from the case of the correct touch. Can be set to notify the user. In addition, based on the user's operation, the generation of the vibration can be stopped to mute the click sound, or the strength of the click feeling can be selected. [0040] When a plurality of attachment electrodes 27 are provided as in the present embodiment, the click feeling and the click sound are adjusted by the phase of the alternating current voltage applied to each attachment electrode 27 so that the alternating current voltage of the same frequency is obtained. The magnitude of vibration and sound pressure can be varied. [0041] Assuming that a plurality of mounting electrodes are arranged to form a matrix of 5 rows × 2 columns as shown in FIG. 7 and 10 piezoelectric vibrating elements 40 are attached, the vibration control unit causes the touch input panel 10 to receive a user When is touched, a plurality of piezoelectric vibrating elements included in the same electrode row are vibrated in 11-05-2019 12 the same phase for a predetermined time, and a plurality of piezoelectric vibrating elements included in another adjacent electrode row are vibrated in the opposite phase to the same phase The operation can be performed by changing the phase every fixed period. When driven in such a waveform drive mode, as shown in FIG. 8, the touch input panel 10 can be vibrated as a whole, and both the vibration and the sound pressure are maximized. The waveform drive mode is suitable for the vibration of the touch input panel (generation of click feeling). [0042] In addition, the vibration control unit drives the plurality of piezoelectric vibrating elements so that two piezoelectric vibrating elements adjacent in the row direction or the column direction vibrate in opposite phases for a predetermined time when the user touches the touch input panel. The eight piezoelectric vibration elements 40 can be driven in the staggered drive mode in which the phase is changed at predetermined intervals. When eight piezoelectric vibrating elements 40 are driven in such a staggered drive mode, the touch input panel 10 can be vibrated as a whole as shown in FIGS. 9A and 9B. In this zigzag drive mode, the vibration is small and the sound pressure is also small, so it is suitable for applications where a click feeling is generated in a quiet state. [0043] In the in-phase drive mode in which all the piezoelectric vibrating elements 40 are driven in the same phase, the sound pressure is the largest, and so is suitable for use as a speaker. In the tworow drive mode in which the phases of the two rows of piezoelectric vibrating elements are alternately changed, the vibration is to some extent and the sound is small. As described above, when a plurality of attachment electrodes are arranged in a matrix, each drive mode can be selected according to the application. [0044] As described above, according to the electronic device of the present embodiment, since the through connection structure (the through hole 50, the through conductive portion 21, and the through conductive portion 78) is provided, the back electrode layer 46 of the piezoelectric 11-05-2019 13 vibrating element 40 and the circuit are provided. In order to electrically connect the surface wiring 25 of the substrate 20, it is not necessary to provide a connecting lead wiring on the outside of the piezoelectric vibrating element 40. As a result, the electronic device can be made thinner than before. [0045] DESCRIPTION OF SYMBOLS 10 Liquid crystal touch input panel 20 Circuit board 22 Insulating layer 21 Penetration conductive part (penetration connection structure part) 24 surface side wiring pattern 25 surface wiring 26 back surface side wiring pattern 27 mounting electrode 28 back surface electrode lead 30 electroconductive diaphragm 32 electroconductive joining layer 40 piezoelectric vibrating element 42 front electrode layer 44 piezoelectric element 46 back electrode layer 50 through hole 52, 54, 56 separation groove 11-05-2019 14
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