JP2010244503A - Ic card including piezoelectric element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology that increases electric power generated by a piezoelectric element, in an IC card that incorporates the piezoelectric element. <P>SOLUTION: An IC card 20 incorporates: an IC portion 1; an antenna portion 2; a piezoelectric element portion 3; and a display portion 4; wherein the IC card 20 is provided with a space portion 5 in the inside thereof where the piezoelectric element 3 is deformed. The piezoelectric element 3 is so structured as to include: a piezoelectric member; and a pair of electrodes that sandwich the piezoelectric element; when pushed by a finger or the like to be pressurized from a direction indicated by an arrow A, the piezoelectric element is so deformed as to bend toward the space portion 5. When the piezoelectric element 3 is deformed in this way, the piezoelectric member polarizes to generate electric charges (plus, minus), so that electric power is generated in the pair of electrodes. And, the generated electric power is supplied to the IC portion 1 and the display portion 4. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an IC card having a piezoelectric element, and more particularly to an IC card having a display unit driven by electricity generated by a built-in piezoelectric element.

  An IC card is equipped with an integrated circuit (IC chip) inside the card to store and hold information related to ID information and usage status (usage frequency, remaining amount, etc.) and perform data processing necessary for the use of the card. Do. Some of these IC cards operate an IC chip using electric power generated by applying pressure to a built-in piezoelectric element (see, for example, Patent Document 1).

  FIG. 12 is a schematic diagram of a conventional IC card incorporating a piezoelectric element described in Patent Document 1. In FIG. 12A is a schematic plan view of the IC card, and FIG. 12B is a schematic cross-sectional view in the thickness direction of the IC card.

  As shown in FIG. 12A, the IC card 100 includes an IC chip 91, a communication antenna 92, and a piezoelectric element 93. The IC chip 91 is connected to the communication antenna 92 and the piezoelectric element 93, respectively.

  As shown in FIG. 12B, the piezoelectric element 93 includes a piezoelectric member 94 and a pair of electrodes 95 a and 95 b that sandwich the piezoelectric member 94. The piezoelectric element 93 acts as a power source for the IC chip 91 by applying pressure to the piezoelectric element 93 by an operation of sandwiching and pressing the finger from both sides of the IC card. That is, when pressure is applied to the portion of the IC card 100 where the piezoelectric element 93 is mounted from the direction indicated by the arrow A, the piezoelectric member 94 is polarized to generate charges (+, −). And electric power generate | occur | produces in a pair of electrode 95a, 95b which pinched | interposed this, and this is supplied to IC chip 91. FIG.

JP 2000-311226 A

  In the conventional IC card 100, the piezoelectric member 93 is crushed and deformed by pressure from both sides of the card in a state where the piezoelectric element 93 is installed inside, thereby causing polarization of the piezoelectric member 94. However, there is a physical limit to the deformation of the piezoelectric member 94, and it is difficult to generate sufficient power (power necessary for maintaining the operation of the IC chip 91) by one deformation. . Furthermore, some recent IC cards further include a display unit for displaying information (for example, usage status) stored in the IC chip, and it is required to be able to check the stored information as needed. . In the case of an IC card equipped with such a display unit, if sufficient power is not generated by the piezoelectric element, the information display cannot be maintained, for example, it disappears immediately even if information is displayed on the display unit. Arise.

  The present invention has been made in view of these problems, and an object thereof is to provide a technique capable of increasing the electric power generated by the piezoelectric element in an IC card incorporating the piezoelectric element.

  One embodiment of the present invention is an IC card. The IC card is an IC card having a piezoelectric element section that generates electric power by deformation, and a display section that displays information by being driven by electricity generated by the piezoelectric element section. The piezoelectric element section is deformed inside the IC card. It has a possible space portion.

  According to the present invention, in an IC card incorporating a piezoelectric element, the electric power generated by the piezoelectric element can be increased.

(A) The schematic plan view of the IC card of 1st Embodiment, (B) The schematic sectional drawing of the IC card along the XX line of FIG. 1 (A). The schematic sectional drawing of the piezoelectric element part which comprises the IC card of 1st Embodiment. FIG. 3 is an exploded cross-sectional view for explaining the configuration of the IC card according to the first embodiment. The schematic sectional drawing of the IC card of 2nd Embodiment. (A) The schematic plan view of the core layer which comprises the IC card of 2nd Embodiment, (B) The schematic sectional drawing of the IC card along the XX line of FIG. 2 (A). The schematic sectional drawing of the IC card of 3rd Embodiment. The exploded sectional view for explaining the composition of the IC card of a 3rd embodiment. The schematic sectional drawing of the IC card of 4th Embodiment. (A) Schematic perspective view of the piezoelectric element part which comprises the IC card of 4th Embodiment, (B) Schematic sectional drawing of the piezoelectric element part along the YY line of FIG. 9 (A). (A) Schematic perspective view of the piezoelectric element part which comprises the IC card of 5th Embodiment, (B) Schematic sectional drawing of the piezoelectric element part along the YY line of FIG. 10 (A). The block diagram which shows an example of a structure of the IC card of 6th Embodiment. (A) The schematic plan view of the conventional IC card which incorporates a piezoelectric element, (B) The schematic sectional drawing of the thickness direction of an IC card. (A) is sectional drawing of the IC card of 7th Embodiment, (B) is a top view of the core layer (Z area | region) of (A). It is sectional drawing of a core layer at the time of pressing a piezoelectric element part. It is sectional drawing which shows the structure of the IC card of 8th Embodiment. (A)-(C) are figures which show operation | movement of the board member at the time of pressing a piezoelectric element part continuously along a longitudinal direction. (A) is sectional drawing of the IC card of 9th Embodiment, (B) is sectional drawing of the core layer of (A). It is sectional drawing of the IC card of 10th Embodiment.

  Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. The same or equivalent components, members, and processes shown in the drawings are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate.

(First embodiment)
FIG. 1 is a schematic diagram of an IC card according to the first embodiment. FIG. 1A is a schematic plan view of an IC card, and FIG. 1B is a schematic cross-sectional view of the IC card taken along line XX in FIG. FIG. 2 is a schematic cross-sectional view of the piezoelectric element portion constituting the IC card of the first embodiment.

As shown in FIG. 1, the IC card 20 according to the first embodiment includes an IC unit 1, an antenna unit 2, a piezoelectric element unit (piezoelectric element) 3, and a display unit 4. The IC card 20 is provided with a space portion 5 in which the piezoelectric element portion 3 can be deformed.

  The IC unit 1 includes a CPU, a memory, an interface, etc. mounted as a system on a single chip, records necessary information such as ID data and usage data (usage frequency, remaining amount, etc.), and data processing associated with card use Signal exchange with devices such as the antenna unit 2 and the display unit 4 is performed.

  The antenna unit 2 is composed of a spiral antenna (antenna coil) and is disposed along the outer edge of the IC card 20. The antenna unit 2 has a function of transmitting / receiving a signal to / from an external terminal device (for example, a reader / writer), and a function of receiving electromagnetic waves sent from the external terminal device and supplying power.

  As shown in FIG. 2, the piezoelectric element section 3 includes a piezoelectric member 9, a pair of electrodes 10a and 10b that sandwich the piezoelectric member 9, and protective films 11a and 11b for protecting the electrodes. . The protective films 11a and 11b are not necessarily provided. The piezoelectric element portion 3 is mounted in a state where the piezoelectric member 9 and the pair of electrodes 10 a and 10 b are stacked in the thickness direction of the IC card 20.

  As the piezoelectric member 9, ceramic materials such as lead zirconate titanate and barium titanate, or polymer materials such as polyvinylidene fluoride, polyvinylidene fluoride trifluoride ethylene copolymer, and polypropylene are employed. In particular, when a polymer material is employed, the amount of flexure can be increased because it is superior in flexibility and hard to crack compared to a ceramic material.

  In the present embodiment, as shown in FIG. 1B, the piezoelectric element unit 3 is installed inside the IC card 20, and the IC card 20 has a space 5 in which the piezoelectric element unit 3 can be deformed. Is provided. For this reason, when pressure is applied from the direction indicated by the arrow A by pressing with a finger or the like, the piezoelectric element portion 3 is deformed so as to bend toward the inside of the space portion 5. When the piezoelectric element portion 3 is deformed in this manner, the piezoelectric member 9 is polarized to generate electric charges (+, −), and electric power is generated in the pair of electrodes 10a and 10b sandwiching the electric charges. The generated power is supplied to the IC unit 1 and the display unit 4. In addition, the piezoelectric element part 3 will return to the original state from the state bent by elasticity, if a finger | toe is lifted and it stops applying pressure.

  The display unit 4 is composed of a liquid crystal, an organic EL, or the like, and is driven by power supplied from the antenna unit 2 or the piezoelectric element unit 3 to display information supplied from the IC chip 1. Here, the information refers to information related to user ID information and IC card usage status (usage, remaining amount, etc.).

  The space portion 5 is configured such that the first concave portion 6 b provided in the core layer 6 and the functional layer 7 are overlapped with the piezoelectric element portion 3 interposed therebetween. In the present embodiment, as shown in FIG. 1, the piezoelectric element portion 3 is configured so as to overlap and close the upper opening portion of the first recess 6 b of the core layer 6.

  FIG. 3 is an exploded cross-sectional view for explaining the detailed configuration of the IC card of the first embodiment.

  As shown in FIG. 3, the IC card 20 has a four-layer structure, and is formed by superimposing a core layer 6 and a functional layer 7 as a center and cover layers 8 a and 8 b sandwiching them.

The core layer 6 is a layer mainly for adjusting the thickness of the IC card 20. The core layer 6 is fitted with a concave portion 6a for fitting the IC portion 1 on the functional layer 7, a first concave portion 6b for forming the space portion 5 between the functional layer 7, and the display portion 4. Recesses or through openings (not shown) for matching are provided at corresponding positions. Note that the opening of the recess 6 a has a size larger than that of the IC portion 1, and the upper opening of the first recess 6 b has a size smaller than that of the piezoelectric element portion 3.

  The functional layer 7 is a layer for connecting the IC unit 1, the antenna unit 2, the piezoelectric element unit 3, and the display unit 4 (not shown) to each other by wiring (not shown). The functional layer 7 is provided with an IC part 1, an antenna part 2, a piezoelectric element part 3, and a display part 4 (not shown) at predetermined positions on one surface side (core layer 6 side). Has been.

  The cover layers 8a and 8b are layers for protecting the core layer 6 and the functional layer 7, and are layers for printing a desired design on the IC card.

  The above-described layers (total of 4 layers) are overlapped and pressed at corresponding positions to form an IC card 20 having the piezoelectric element portion 3 shown in FIG. 1 (B), and at the same time, the piezoelectric element portion therein. A space 5 in which 3 is deformable is formed.

  According to the IC card of the first embodiment (IC card 20 including the piezoelectric element portion 3), the following effects can be obtained.

  (1) When the piezoelectric element portion 3 provided at a predetermined position of the IC card 20 is pressed, the piezoelectric element portion 3 is deformed in the space portion 5 provided in the IC card 20. Thereby, the deformation amount of the piezoelectric element portion 3 can be increased as compared with the conventional case where the piezoelectric element (piezoelectric member) is crushed and deformed. For this reason, the electric power generated by the piezoelectric element portion 3 is increased as compared with the conventional case.

  (2) Since the piezoelectric element portion 3 is deformed in the space portion 5 provided inside the IC card 20, compared with the case where the entire IC card is bent and the piezoelectric element (piezoelectric member) is deformed. The risk of damaging the card (for example, the risk of breaking the IC card by bending it too much) can be reduced.

  (3) Since the piezoelectric element portion 3 is deformed in the space portion 5 provided inside the IC card 20, the IC card 20 can be used even when the IC card 20 is placed in a card case (for example, a regular case). The piezoelectric element portion 3 can be deformed by an operation of pushing the surface of the piezoelectric element portion 3. For this reason, when confirming the information displayed on the display unit 4, the operation of inserting and removing the IC card 20 from the card case can be omitted, and the convenience of the IC card can be improved.

(Second Embodiment)
FIG. 4 is a schematic cross-sectional view of the IC card of the second embodiment. The difference from the first embodiment is that a protrusion 12 protruding toward the functional layer 7 side (piezoelectric element portion 3) is provided at the bottom of the first recess 6b provided in the core layer 6 constituting the IC card 20. It is provided. Other than that, the configuration is the same as that of the first embodiment.

  Specifically, the core layer 6 constituting the IC card 20 of the second embodiment will be described. FIG. 5 is a schematic view of a core layer constituting the IC card of the second embodiment. 5A is a schematic plan view of the core layer, and FIG. 5B is a schematic cross-sectional view of the core layer taken along line XX in FIG. 5A.

As in the first embodiment, the core layer 6 includes a recess 6a for fitting the IC portion 1 on the functional layer 7 and a first recess 6b for forming the space portion 5 between the functional layer 7. The recess 6c for fitting the display unit 4 is provided at a corresponding position. However, in the core layer 6, a hemispherical projection 12 is provided at the bottom of the first recess 6b. One protrusion 12 is provided at the center of the first recess 6b, and its height is about half the depth of the first recess 6b.

  As shown in FIG. 5, the protruding portion 12 is provided integrally with the core layer 6. However, the protruding portion may be provided separately by bonding the protruding portion to the core layer of the first embodiment. Further, although it depends on the size of the opening of the first recess 6b and the size of the protrusion 12, the protrusion 12 does not necessarily have to be one place, and may be provided at a plurality of places at a predetermined interval.

  The core layer 6 described above (the core layer 6 including the first recess 6b having the protrusion 12) is prepared, and each layer (four layers in total) is superimposed and pressure-bonded in the same manner as in the first embodiment. Thereby, the IC card 20 including the piezoelectric element portion 3 shown in FIG. 4 is formed, and at the same time, the space portion 5 in which the piezoelectric element portion 3 can be deformed is formed.

  In the IC card 20 according to the second embodiment, as shown in FIG. 4, by applying pressure to the piezoelectric element portion 3 from the direction indicated by the arrow A, the piezoelectric element portion 3 is made to protrude from the protrusion 12 in the space portion 5. To generate electric power.

  According to the IC card of the second embodiment, the following effects can be obtained in addition to the effects similar to the above (1) to (3).

  (4) When the deformation of the piezoelectric element portion 3 is repeated, the piezoelectric element portion 3 is bent from the inside of the first recess 6b due to the deterioration of the piezoelectric element portion 3 (from the state of hanging down to the first recess 6b side). May not return to the state (the state shown in FIG. 4). However, in the IC card 20 according to the second embodiment, even if the piezoelectric element portion 3 is bent and deformed, the deformation of the central portion of the piezoelectric element portion 3 stops in contact with the protruding portion 12, and around the protruding portion 12. A gap (space) is maintained between the piezoelectric element portion 3 and the bottom of the first recess 6b. For this reason, even if the piezoelectric element portion 3 deteriorates and bends, if pressure is applied from the direction indicated by the arrow A by pressing it with a finger as before, The piezoelectric element unit 3 can be deformed. Therefore, the reliability of the IC card with repeated use of the piezoelectric element portion 3 is improved.

(Third embodiment)
FIG. 6 is a schematic cross-sectional view of the IC card of the third embodiment. FIG. 7 is an exploded cross-sectional view for explaining the detailed configuration of the IC card according to the third embodiment. The main difference from the first embodiment is that the space portion 5 is formed inside the IC card 20 with the piezoelectric element portion 3 provided on the cover layer 8a side.

  Specifically, in the core layer 6 of the third embodiment, the space portion 5 is configured between the functional layer 7 and the through opening 6a1 for fitting the IC portion 1 on the functional layer 7. The through opening 6b1 and a through opening (not shown) for fitting the display unit 4 are provided at corresponding positions. In the core layer 6, the piezoelectric element portion 3 is installed so as to close the through opening 6 b 1 on one surface side (the side opposite to the functional layer 7).

  As in the first embodiment, the functional layer 7 includes an IC unit 1, an antenna unit 2, and a display unit 4 (not shown) at predetermined positions on one surface side (core layer 6 side). is set up.

  The core layer 6 described above (the core layer 6 including the piezoelectric element portion 3 installed by closing one of the through openings 6b1) is prepared, and the respective layers (four layers in total) are superimposed in the same manner as in the first embodiment. And crimp. Thereby, the IC card 20 having the piezoelectric element portion 3 shown in FIG. 6 is formed, and at the same time, a space portion 5 in which the piezoelectric element portion 3 can be deformed is formed.

In the IC card 20 of the third embodiment, as shown in FIG.
By applying pressure from the direction indicated by (the direction opposite to the first embodiment), the piezoelectric element portion 3 is deformed into the space portion 5 to generate electric power.

  According to the IC card of the third embodiment, the same effects as the above (1) to (3) can be obtained.

(Fourth embodiment)
FIG. 8 is a schematic sectional view of an IC card according to the fourth embodiment. The difference from the first embodiment is that the piezoelectric element portion 13 is provided in the space portion 5 in a wavy state having irregularities in the thickness direction of the IC card 20. Other than that, the configuration is the same as that of the first embodiment.

  Specifically, the piezoelectric element portion 13 constituting the IC card 20 of the fourth embodiment will be described. FIG. 9 is a schematic view of the piezoelectric element portion constituting the IC card of the fourth embodiment. 9A is a schematic perspective view of the piezoelectric element portion, and FIG. 9B is a schematic cross-sectional view of the piezoelectric element portion taken along line YY of FIG. 9A.

  As shown in FIG. 9, the piezoelectric element section 13 includes a wavy piezoelectric member 14 having irregularities in the thickness direction of the IC card (vertical direction in FIG. 8) and a pair of electrodes (first electrode 15a, And a second electrode 15b). The piezoelectric member 14 is a layer in which a sheet layer having a certain thickness repeats meandering in the thickness direction of the IC card 20, and the surface thereof is a repetition of a convex region and a concave region (the surface is in a wavy state). The pair of electrodes is opposed to the first electrode 15a selectively provided along the convex region of the wavy piezoelectric member 14, with the first electrode 15a interposed therebetween, and along the concave region of the wavy piezoelectric member 14. And the second electrode 15b provided. Each of the pair of electrodes is commonly connected on one end side. The piezoelectric element portion 13 is mounted in a state in which the piezoelectric member 14 and a pair of electrodes (first electrode 15 a and second electrode 15 b) are stacked in the thickness direction of the IC card 20.

  Here, the first electrode 15a (and the second electrode 15b) is selectively provided along the convex region (and the concave region) of the wave-like piezoelectric member 14 when the wave-like piezoelectric member 14 expands and contracts. This is to prevent the generation of electric charges (+, −) due to the polarization of the piezoelectric member 14 due to the simultaneous generation of stress and tensile stress.

  The functional layer 7 provided with the above-described piezoelectric element portion 13 is prepared, and each layer (four layers in total) is superimposed and pressure-bonded in the same manner as in the first embodiment. Thereby, the IC card 20 including the piezoelectric element portion 13 shown in FIG. 8 is formed, and at the same time, the space portion 5 in which the piezoelectric element portion 13 can be deformed is formed.

  In the IC card 20 according to the fourth embodiment, as shown in FIG. 8, the wavy piezoelectric element portion 13 is formed by applying pressure to the piezoelectric element portion 13 from the direction indicated by the arrow A by pressing it with a finger. It expands and deforms in the space part 5 to generate electric power. In addition, the piezoelectric element part 13 will return to the original state from the state bent by elasticity, if a finger | toe is lifted and it stops applying pressure.

  According to the IC card of the fourth embodiment, the same effects as the above (1) to (3) can be obtained.

(Fifth embodiment)
FIG. 10 is a schematic view of a piezoelectric element portion constituting the IC card of the fifth embodiment. Here, FIG. 10A is a schematic perspective view of the piezoelectric element portion, and FIG. 10B is a schematic cross-sectional view of the piezoelectric element portion taken along line YY of FIG. 10A. The difference from the piezoelectric element unit 13 of the fourth embodiment is the configuration of the piezoelectric element unit. Specifically, the IC is different from the piezoelectric member 17 configuring the piezoelectric element unit 16.
A plurality of first convex portions 19b (the opposite surface is a concave portion 19a) protruding in the thickness direction of the card are formed, and the first convex portions 19b are formed at the bottom of the first concave portion 6b of the core layer 6 constituting the IC card. It is installed so that it may protrude toward. Other than that, the configuration is the same as that of the fourth embodiment.

  As shown in FIG. 10B, the piezoelectric element portion 16 of the fifth embodiment includes a planar sheet-like piezoelectric member 17 and a pair of electrodes 18 a and 18 b that sandwich the piezoelectric member 17. The piezoelectric member 17 is formed with a plurality of first protrusions 19b projecting in the thickness direction of the IC card (the opposite surface is a dimple-like recess 19a corresponding to the first protrusion 19b), and a pair of electrodes 18a, Reference numeral 18b is formed reflecting the shapes of the first convex portion 19b and the concave portion 19a. And the piezoelectric element part 16 is installed so that the 1st convex part 19b may protrude toward the bottom part of the 1st recessed part 6b of the core layer 6 which comprises an IC card.

  Specifically, a functional layer 7 is prepared in which the opening surface of the concave portion 19 of the piezoelectric element portion 16 is directed toward the functional layer 7 side, and each layer (a total of four layers) is superimposed in the same manner as in the fourth embodiment. Crimp. As a result, an IC card including the piezoelectric element portion 16 is formed, and at the same time, a space portion 5 in which the piezoelectric element portion 16 can be deformed is formed.

  In the IC card of the fifth embodiment, as in the fourth embodiment, a pressure is applied to the piezoelectric element portion 16 by pressing it with a finger, so that the tip portion of the first convex portion 19b of the piezoelectric element portion 16 is spaced. It deform | transforms so that it may crush in the part 5, and electric power is generated. In addition, the piezoelectric element part 16 will return to the original state from the state bent by elasticity, if it remove | eliminates a finger and stops applying a pressure.

  According to the IC card of the fifth embodiment, the same effect as that of the fourth embodiment can be obtained.

(Sixth embodiment)
FIG. 11 is a block diagram showing an example of the configuration of an IC card according to the sixth embodiment. The IC card 20 of the sixth embodiment is based on the configuration of the first embodiment, and includes a dedicated memory 1b in addition to the memory 1a included in the IC unit 1, and the piezoelectric element unit 3 includes the dedicated memory 1b, the display unit 4, and the like. It is comprised so that the electric power which generate | occur | produces may be supplied. The rest is the same as the configuration of the first embodiment.

  As shown in FIG. 11, the IC card of the sixth embodiment includes an IC unit 1 having a memory 1a, an antenna unit 2, a piezoelectric element unit 3, a display unit 4, and a dedicated memory 1b.

  The IC unit 1 has the same function as that of the first embodiment. In the present embodiment, among the information recorded in the memory 1a, information to be confirmed at any time on the display unit 4 (information on usage status such as usage frequency and remaining amount) ) Is recorded in the dedicated memory 1b. The IC unit 1 is driven by electric power supplied from the antenna unit 2.

  The memory 1a is controlled by the IC unit 1 and is a memory for recording necessary information such as ID data and usage data as needed. The memory 1a is driven by the power supplied from the antenna unit 2 together with the IC unit 1.

  The dedicated memory 1b is for recording only information to be confirmed on the display unit 4 at any time. The dedicated memory 1b is driven by electric power generated in the piezoelectric element unit 3 and transmits a signal related to the recorded information without using the IC unit 1. It has a function of sending and displaying on the display unit 4.

  The other parts (antenna part 2, piezoelectric element part 3, display part 4) have the same functions as in the first embodiment.

  According to the IC card of the sixth embodiment, in addition to the effects corresponding to the first embodiment, the following effects can be obtained.

  (5) A dedicated memory 1b for recording only information to be confirmed at any time on the display unit 4 and displaying the information on the display unit 4 is provided. Thereby, the circuit scale driven by the piezoelectric element unit 3 is reduced, and the power consumption is reduced compared to the case where the entire IC unit 1 including the memory 1a is driven and displayed on the display unit 4 as in the first embodiment. can do. Therefore, the performance of maintaining the display state on the display unit 4 is improved. That is, even if the electric energy generated by the piezoelectric element unit 3 is the same, the display on the display unit 4 can be continued for a longer time.

(Seventh embodiment)
FIG. 13A is a cross-sectional view of the IC card 20 of the seventh embodiment, and FIG. 13B is a top view of the core layer (Z region) of FIG. The difference from the first embodiment is that the second recess 6d is formed on the bottom surface of the first recess 6b of the core layer 6, and extends from the bottom surface of the first recess 6b to a part of the opening surface of the second recess 6d. The plate member 23 is provided. Since the other configuration is the same as that of the first embodiment, description thereof is omitted.

  In the IC card 20 of the seventh embodiment, a rectangular first recess 6 b is formed in the core layer 6. Furthermore, a rectangular second recess 6d corresponding to the length in the short direction (Y direction) is formed on the bottom surface of the first recess 6b at the center in the longitudinal direction (X direction). The first recess 6b and the second recess 6d have an opening surface wider than the bottom surface in the X direction, and the side surfaces thereof are tapered.

  In addition, the piezoelectric element portion 3 is disposed on the upper surface of the core layer 6 so as to block the opening surface of the first recess 6b. Therefore, the space portion 5 is formed by the piezoelectric element portion 3, the first concave portion 6b, and the second concave portion 6d.

  A plate member 23 is provided on each side of the second recess 6d in the X direction so as to extend from the bottom surface of the first recess 6b to a part of the opening surface of the second recess 6d. The plate member 23 is a rectangular member corresponding to the length of the first recess 6b in the Y direction, and has protruding portions 23a at both ends in the Y direction. The core layer 6 is formed with a fitting portion (not shown) corresponding to the shape of the protruding portion 23a. By fitting the protruding portion 23a into the fitting portion of the core layer 6, the plate member 23 is rotatably supported using both corners in the X direction of the opening surface of the second recess 6d. As the material constituting the plate member 23, a metal material such as SUS is preferably used, but any material having a certain hardness may be used.

  Next, the action of the plate member 23 when the piezoelectric element portion 3 is pressed will be described with reference to FIG. FIG. 14 is a cross-sectional view of the core layer when the piezoelectric element portion 3 is pressed.

  In the IC card 20 of the seventh embodiment, when the piezoelectric element portion 3 is pressed from the outside of the IC card, the piezoelectric element portion 3 is deformed toward the space portion 5 of the second recess 6d. At this time, the end portion of the plate member 23 facing the opening surface of the second recess 6d is inclined into the space 5 of the second recess 6d along the side surface of the second recess 6d. Therefore, the opposite end of the plate member 23 (the end facing the upper surface of the first recess 6b) is inclined toward the outside of the IC card, and the piezoelectric element portion 3 is deformed. That is, in the present embodiment, power is generated by the deformation caused by the direct pressing and the deformation caused by the plate member 23 occurring in the piezoelectric element portion 3.

  According to the IC card 20 of the seventh embodiment, in addition to the effects corresponding to the first embodiment, the following effects can be obtained.

  (6) In the seventh embodiment, the second concave portion 6d is formed on the bottom surface of the first concave portion 6b of the core layer 6 so that the corner portion of the opening surface of the second concave portion 6d can be rotated as a fulcrum. A plate member 23 is provided across the bottom surface of the first recess 6b and part of the opening surface of the second recess 6d. Thus, when the piezoelectric element portion 3 is pressed toward the space portion 5 of the second recess 6d, the end portion of the plate member 23 facing the upper surface of the first recess 6b faces the outside of the IC card. Deform. Therefore, compared with the case where the plate member 23 is not provided, the deformation of the piezoelectric element portion 3 can be increased, and the power generation amount can be increased.

(Eighth embodiment)
Next, the configuration of the IC card 20 of the eighth embodiment will be described. Unlike the configuration in which the IC card 20 of the present embodiment generates power by pressing only one portion of the piezoelectric element portion 3 as in the first to seventh embodiments, the piezoelectric element portion 3 is traced along the longitudinal direction. It is the structure which generates electric power by pressing continuously. The present embodiment is a modification of the IC card 20 of the seventh embodiment, and components having the same functions as those of the seventh embodiment are denoted by the same reference numerals and description thereof is omitted.

  The configuration of the IC card 20 of the eighth embodiment will be described with reference to FIG. FIG. 15 is a cross-sectional view showing the configuration of the IC card 20 of the eighth embodiment.

  In the core layer 6 of the eighth embodiment, a rectangular first recess 6b is formed. The bottom of the first recess 6b is formed on an uneven surface. As a result, a plurality of second recesses 6e are continuously formed in a line. The second recessed portion 6e has an opening surface wider than its bottom surface in the X direction, and its side surface is tapered. Plate members 23 are respectively disposed on the upper surfaces of the second convex portions 6e 'existing between the second concave portions 6e. The height of the second convex portion 6 e ′ is designed so that the upper surface of the plate member 23 is lower than the upper surface of the core layer 6.

  The plate member 23 is a second concave portion adjacent to the second convex portion 6e ′ so that the plate member 23 can be rotated with both corners on the upper surface of the second convex portion 6e ′ (corner portions of the opening surface of the second concave portion 6e) as fulcrums. 6e is provided so as to extend from a part of one opening face to a part of the other opening face.

  Next, the action of the plate member 23 when the piezoelectric element portion 3 is continuously pressed along the longitudinal direction will be described with reference to FIG. FIGS. 16A to 16C are views showing the operation of the plate member 23 when the piezoelectric element portion 3 is continuously pressed along the longitudinal direction.

  In the IC card 20 of the eighth embodiment, when the piezoelectric element unit 3 is pressed along the X direction from the outside of the IC card, when the piezoelectric element unit 3 at a position facing the second recess 6e is pressed, FIG. As shown to A), the piezoelectric element part 3 deform | transforms toward the space part 5 of the 2nd recessed part 6e. At this time, the end of the plate member 23 facing the opening surface of the second recess 6e in which the piezoelectric element portion 3 is deformed is inclined into the space 5 along the side surface of the second recess 6e. Therefore, the end on the opposite side of the plate member 23 is inclined toward the outside of the IC card to deform the piezoelectric element portion 3.

  In this embodiment, since the piezoelectric element portion 3 is continuously pressed along the X direction, when the piezoelectric element portion 3 positioned on the upper surface of the second convex portion 6e ′ is pressed, as shown in FIG. In addition, the piezoelectric element portion 3 is hardly deformed and does not generate power. However, when the piezoelectric element portion 3 at a position facing the adjacent second recess 6e is pressed, the piezoelectric element portion 3 is largely deformed again to generate electric power, as shown in FIG.

  Thus, in this embodiment, the piezoelectric element unit 3 can be expanded and contracted a plurality of times by simply pressing the piezoelectric element unit 3 once along the X direction, and power generation can be performed a plurality of times. It is.

  According to the IC card 20 of the eighth embodiment, in addition to the effects corresponding to the first and seventh embodiments, the following effects can be obtained.

  (7) In the eighth embodiment, the second convex portion 6e ′ having an upper surface lower than the upper surface of the core layer 6 is formed between the second concave portions 6e, and both corners on the upper surface of the second convex portion 6e ′ are formed. The upper surface of the second convex portion 6e ′ extends from a part of one opening surface of the second concave portion 6e adjacent to the second convex portion eb ′ to a part of the other opening surface so that it can be rotated as a fulcrum. The plate member 23 provided is provided. Thereby, when the piezoelectric element part 3 is continuously pressed along the X direction, the piezoelectric element part 3 can be largely deformed by the plate member 23 for each second recess 6e, and the power generation amount can be further increased. it can.

  (8) In the eighth embodiment, the second recess 6e has an opening surface wider than its bottom surface in the X direction, and its side surface is tapered. Thereby, when pressing the piezoelectric element part 3 continuously along the X direction, the pressing can be smoothly performed as compared with the case where the side surface of the second recess 6e is a right angle.

(Ninth embodiment)
FIG. 17A is a cross-sectional view of the IC card 20 of the ninth embodiment, and FIG. 17B is a cross-sectional view of the core layer of FIG. 17A. As in the eighth embodiment, the present embodiment is configured to generate power by continuously pressing the piezoelectric element portion 3 along the X direction. The difference from the eighth embodiment is that the plate member 23 is not provided. Since other configurations are the same as those of the eighth embodiment, description thereof is omitted.

  In the core layer 6 of the ninth embodiment, a plurality of second recesses 6e are continuously formed in a line. The second recessed portion 6e has an opening surface wider than its bottom surface in the X direction, and its side surface is tapered. A second protrusion 6 e ′ is formed between the second recesses 6 e, and the height of the second protrusion 6 e ′ is designed to be the same as the upper surface of the core layer 6.

  In the IC card 20 of the ninth embodiment, when the piezoelectric element portion 3 is pressed along the X direction from the outside of the IC card, the piezoelectric element portion 3 is pressed when the piezoelectric element portion 3 at a position facing the second recess 6e is pressed. 3 is deformed toward the space 5 of the second recess 6e to generate electric power. Next, when the piezoelectric element portion 3 located on the upper surface of the second convex portion 6e 'is pressed, the piezoelectric element portion 3 is hardly deformed and does not generate power. However, when the piezoelectric element portion 3 at a position facing the adjacent second recess 6e is pressed, the piezoelectric element portion 3 is deformed again toward the space portion 5 to generate electric power.

  According to the IC card 20 of the ninth embodiment, in addition to the effects corresponding to (8) of the first embodiment and the eighth embodiment, the following effects can be obtained.

  (9) In the ninth embodiment, when the piezoelectric element portion 3 is continuously pressed along the X direction, the piezoelectric element portion 3 can be deformed for each second recess 6e, and one second recess 6e is provided. Compared with a configuration in which only the power is provided, the power generation amount can be further increased.

(10th Embodiment)
FIG. 18 is a cross-sectional view of the IC card according to the tenth embodiment. In the IC card of the tenth embodiment, the film type solar cell 200 is laminated on the IC card 20 of the first to ninth embodiments. According to the IC card of the tenth embodiment, the following effects can be obtained in addition to the effects corresponding to the first to ninth embodiments.

(10) In the tenth embodiment, the IC card 20 and the film type solar cell 200 are provided. Thereby, when operating the microcomputer in IC card 20 with large power consumption, the electric power generated by deforming piezoelectric element part 3 of IC card 20 can be used. Further, since the film type solar cell 200 generates power in a bright place, the display unit 4 can be driven for a long time using the power generated by the film type solar cell 200 without deforming the piezoelectric element unit 3.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  In the first to fifth embodiments, a soft material may be filled in the space provided in the IC card. The soft material may be any material that is softer than the core layer, the functional layer, and the piezoelectric element that form the space, and examples thereof include a silicone resin. By adopting such a configuration, when the pressure is released after the finger is released, the piezoelectric element part is bent from the bent state due to the repulsive force of the soft material in addition to the elastic force of the piezoelectric element part itself. It will return to the state of. For this reason, the reliability of the IC card accompanying the repeated use of the piezoelectric element portion is improved.

  In the said 1st Embodiment, although the piezoelectric element part showed the example comprised in the form which overlapped and closed the opening upper part of the recessed part of a core layer, this invention is not limited to this. For example, the entire piezoelectric element portion may be installed inside the core layer, and the functional layer may be configured to directly cover the upper opening of the concave portion of the core layer. The same configuration may be used in the second to fifth embodiments. In such a case, the same effect can be enjoyed.

  In the said 4th and 5th embodiment, you may further provide the protective film for protecting a pair of electrode like the piezoelectric element part of 1st Embodiment. By doing in this way, since an electrode is protected in the contact part with the recessed part of the core layer which comprises a space part, the reliability of the IC card accompanying the repeated use of a piezoelectric element part improves.

  In the fifth embodiment, the example in which the piezoelectric element portion is installed so that the convex portion protrudes toward the bottom portion of the concave portion of the core layer constituting the IC card is shown, but the present invention is not limited to this. For example, the piezoelectric element part may be installed in the opposite direction, and the convex part may be installed so as to protrude toward the functional layer constituting the IC card. In this case, the same effect can be enjoyed.

  In the sixth embodiment, the example in which the dedicated memory is provided for the IC card of the first embodiment and the display unit is operated is shown. However, the present invention is not limited to this. For example, a dedicated memory may be provided for the IC cards of the second to fifth embodiments, and the display unit may be operated. Alternatively, a dedicated memory may be provided for the IC card having the structure of the conventional piezoelectric element portion, and the display portion may be operated. In this case, the same effect can be enjoyed.

  In the sixth embodiment, the example in which the dedicated memory is provided separately from the chip configuring the IC unit has been described, but the present invention is not limited to this. For example, the IC unit and the dedicated memory may be configured as a single chip. By doing so, the number of mounted parts is reduced, and the cost of the IC card can be reduced as compared with the case where a dedicated memory is separately provided.

  In the seventh and eighth embodiments, the configuration using the separated plate members 23 has been described, but the present invention is not limited to this. For example, each plate member 23 may be configured to be connected by a support member that can rotate up and down about the plate member 23 as an axis. Thereby, when the piezoelectric element portion 3 is pressed against the concave portion, the adjacent plate member 23 moves toward the outside of the IC card, so that the piezoelectric element portion 3 can be largely deformed by one press. Therefore, it is possible to increase the power generation amount with a simple operation.

  In the eighth embodiment, the plate member 23 has one opening of the second concave portion 6e adjacent to the second convex portion 6e ′ so that the plate member 23 can be rotated about both corners of the upper surface of the second convex portion 6e ′. Although one is provided across a part of the surface and a part of the other opening surface, the present invention is not limited to this. For example, one plate member 23 is provided on each second convex portion 6e ′, one by one from the upper surface of the second convex portion 6e ′ toward a part of the opening surface of the adjacent second concave portion 6e. It may be a configuration.

DESCRIPTION OF SYMBOLS 1 IC part, 2 antenna part, 3 piezoelectric element part, 4 display part, 5 space part, 6 core layer, 6a, 6c recessed part, 6b 1st recessed part, 6e 2nd recessed part, 6e '2nd convex part, 7 functional layer , 8a, 8b cover layer, 9 piezoelectric member, 10a, 10b electrode, 11a, 11b protective film.

Claims (8)

  An IC card having a piezoelectric element section that generates electric power by deformation and a display section that displays information by being driven by electricity generated by the piezoelectric element section, in which the piezoelectric element section can be deformed IC card characterized by having a portion.   2. The space portion is formed by a first recess provided in a substrate constituting the IC card and the piezoelectric element portion disposed so as to close the first recess. IC card according to.   The piezoelectric element portion includes a piezoelectric member and a pair of electrodes sandwiching the piezoelectric member, which are stacked in the thickness direction of the IC card, and are provided in the space portion so as to be deformable in the thickness direction of the IC card. The IC card according to claim 1 or 2, characterized in that   4. The IC card according to claim 2, wherein the space portion is filled with a soft material that is more easily deformed than the substrate.   The protrusion part which protrudes toward the said piezoelectric element part is provided in the bottom part of the said 1st recessed part facing the said piezoelectric element part, The Claim 1 characterized by the above-mentioned. IC card. The piezoelectric element portion includes a wavy piezoelectric member having irregularities in the thickness direction of the IC card and a pair of electrodes that sandwich the piezoelectric member.
The pair of electrodes are opposed to a first electrode selectively provided along a convex region of the wavy piezoelectric member, and the first electrode and the piezoelectric member are opposed to each other, and a concave region of the wavy piezoelectric member is provided. 5. The IC card according to claim 2, further comprising: a second electrode selectively provided along the line.   The piezoelectric element section includes a piezoelectric member and a pair of electrodes that sandwich the piezoelectric member, and further includes a first protrusion protruding in the thickness direction of the IC card. Item 5. The IC card according to any one of Items 2 to 4. A second recess is further formed on the bottom surface of the first recess facing the piezoelectric element portion,
The IC card according to any one of claims 2 to 4, further comprising a plate member supported so as to be rotatable about a corner portion of the opening surface of the second recess.

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