Vibration device and vibration method thereof

Abstract

The invention relates to a vibration device and a vibration method thereof. In an IC card, a control circuit includes a first control unit that generates a sound vibration signal and an amplification circuit that amplifies the sound vibration signal generated by the first control unit, and a drive signal amplified by the amplification circuit is used as a drive signal for driving a piezoelectric element. Therefore, the vibration of the piezoelectric element represents the action corresponding to the sound vibration signal. Namely, the vibration of the piezoelectric element shows a continuous and smooth operation compared with the operation corresponding to the square pulse signal, and the vibration modes of the piezoelectric element are diversified.

Description

Technical Field

[0001] The invention relates to a vibration device and a vibration method thereof. Background Art

[0002] Japanese Patent Application Laid-Open No. 2014-132404 discloses a non-contact IC card having a vibration mechanism as one type of vibration device, and a piezoelectric element or a vibration motor is used as a vibration source of the vibration mechanism. Summary of the invention

[0003] The inventors have repeatedly studied the vibration mode of a vibration device, and as a result, have newly discovered a technology capable of diversifying the vibration mode.

[0004] According to various aspects of the present invention, a vibration device and a vibration method thereof are provided, which realize diversification of vibration modes.

[0005] A vibration device involved in one aspect of the present invention comprises: a power receiving unit, which receives contactless power supply from a power supply device; a control unit, which generates a drive signal through the power received by the power receiving unit; a piezoelectric vibrator, which vibrates according to the drive signal generated by the control unit, and the control unit includes: a first control unit, which generates a sound vibration signal; and a second control unit, which amplifies the sound vibration signal generated by the first control unit to generate a drive signal.

[0006] One aspect of the present invention involves a vibration method of a vibration device, wherein the vibration device includes a power receiving unit that receives contactless power from a power supply device, a control unit that generates a drive signal using the power received by the power receiving unit, and a piezoelectric vibrator, wherein the control unit includes a first control unit that generates a sound vibration signal, and a second control unit that amplifies the sound vibration signal generated by the first control unit to generate a drive signal, and in the vibration device, the piezoelectric vibrator vibrates according to the drive signal generated by the second control unit of the control unit.

[0007] In the above-mentioned vibration device and vibration method thereof, the control unit includes a first control unit that generates a sound vibration signal and a second control unit that amplifies the sound vibration signal generated by the first control unit. By using the signal amplified by the second control unit as a driving signal for driving the piezoelectric vibrator, vibration corresponding to the sound vibration signal can be achieved, and the vibration mode of the piezoelectric vibrator can be diversified. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic perspective view showing an IC card according to an embodiment.

[0009] Figure 2 Yes means Figure 1 The diagram shows the IC card cover on the reader / writer.

[0010] Figure 3 Yes means Figure 1 An exploded perspective view of the stacked structure of the IC card shown.

[0011] Figure 4 Yes means Figure 1 A diagram of the vibration circuit of an IC card is shown.

[0012] Figure 5 The diagrams show vibration circuits of IC cards of different types.

[0013] Figure 6 The diagrams show vibration circuits of IC cards of different types. DETAILED DESCRIPTION

[0014] Hereinafter, various embodiments and examples will be described with reference to the accompanying drawings. In addition, the same reference numerals are given to the same or corresponding parts in each drawing, and repeated descriptions are omitted.

[0015] As a kind of vibration device, Figure 1 The IC card 1 shown in FIG. 1 is used as an example for explanation. The IC card 1 has an IC module 10 for performing calculation processing. The IC card 1 of this embodiment is a contactless type and has an antenna coil 16 as described below. Figure 2 As shown, the IC module 10 is covered on the reader / writer 2 as a power supply device (i.e., kept at a predetermined distance), and non-contact power supply is performed from the reader / writer 2, and communication is performed between the reader / writer 2. In this specification, "non-contact power supply" includes non-contact communication such as near field communication (NFC) in addition to power transmission.

[0016] The IC card 1 has a plate-like appearance and has a front surface 1a and a back surface 1b. The IC module 10 is exposed on the front surface 1a. Figure 3 The laminated structure shown is laminated in the order of plastic plate 11, antenna sheet 12, base material 13 and metal plate 14 from the back side 1b. The layers of IC card 1 are bonded by a known adhesive layer (eg double-sided adhesive tape, adhesive material layer) not shown.

[0017] The plastic plate 11 is made of a resin material that does not hinder magnetic flux. The surface of the plastic plate 11 constitutes the back side 1b of the IC card 1. The metal plate 14 is made of a metal material such as stainless steel or titanium. The surface of the metal plate 14 constitutes the surface 1a of the IC card 1. The IC module 10 is embedded in a part of the metal plate 14.

[0018] The substrate 13 is a film made of an insulating resin material, for example, it can be made of acrylic acid. A voltage regulator 15, a piezoelectric element 18 and a control circuit 20 are installed on the substrate 13. The piezoelectric element 18 is a kind of piezoelectric vibrator, and the piezoelectric vibrator can be composed of only a piezoelectric element, or a combination of a piezoelectric element and a vibration plate. The vibration plate can be a plate made of resin or a plate made of metal. In the present embodiment, the piezoelectric element 18 is accommodated in a through hole provided in the substrate 13 and bonded to the back side 14a of the metal plate 14. By bonding and fixing the piezoelectric element 18 to the metal plate 14, the displacement or vibration of the piezoelectric element 18 is transmitted to the metal plate 14. That is, the vibration generated in the piezoelectric element 18 is transmitted from the inside of the IC card 1 to the surface portion, and is directly felt by the user of the IC card 1. The IC card 1 can be in a state of overall vibration or in a state of partial vibration of a part of the surface portion.

[0019] The antenna sheet 12 is made of an insulating resin material or a magnetic material. The antenna sheet 12 is provided with an antenna coil 16 including a coil pattern wound along the outer edge. The antenna coil 16 is electrically connected to the voltage regulator 15 of the substrate 13. The antenna coil 16 is magnetically connected to the coil included in the IC module 10 of the metal plate 14.

[0020] The IC card 1 has Figure 4 That is, the IC card 1 includes a power receiving unit 17 that receives contactless power from the reader / writer 2, a control circuit 20 (control unit) that generates a drive signal based on the power received by the power receiving unit 17, and a vibration circuit 30 that includes a piezoelectric element 18 that vibrates based on the drive signal generated by the control circuit 20.

[0021] The power receiving unit 17 includes the voltage regulator 15 and the antenna coil 16 described above, receives contactless power supply from the reader / writer 2 and outputs a driving voltage for driving the control circuit 20. The control circuit 20 includes a first control unit 21 and an amplifier circuit 22 (second control unit). In the present embodiment, the first control unit 21 is configured to include a microcomputer 23 (signal generating unit) that generates a square pulse signal and an RC filter 24 (filter unit) that performs analog conversion on the square pulse signal generated by the microcomputer 23. Therefore, a sound vibration signal in which the square pulse signal is analog converted is output from the first control unit 21. A driving voltage V1 is applied from the power receiving unit 17 to the microcomputer 23 and the amplifier circuit 22 of the first control unit 21, respectively. The values ​​of the driving voltage V1 applied to the microcomputer 23 and the amplifier circuit 22 of the first control unit 21 are the same (+5V as an example). The sound vibration signal generated by the first control unit 21 is amplified (boosted) in the amplifier circuit 22, and the amplified driving signal is sent to the piezoelectric element 18. The piezoelectric element 18 vibrates in response to a drive signal sent from the control circuit 20 .

[0022] The power supply used in the amplifier circuit 22 may also be, for example, Figure 5 As in the vibration circuit 30A shown in the figure, a high voltage V2 (ie, V2>V1) that can be output from the diode bridge to the power receiving unit 17 is used instead of a single power supply that is common to the power supply used in the microcomputer 23.

[0023] Alternatively, the first control unit 21 may output a digital sound vibration signal. In this case, the digital sound vibration signal may be analog-demodulated and amplified in the amplifier circuit 22 including a DA converter.

[0024] In the IC card 1, the control circuit 20 includes a first control unit 21 that generates a sound vibration signal and an amplifier circuit 22 that amplifies the sound vibration signal generated by the first control unit 21, and uses the drive signal amplified by the amplifier circuit 22 as a drive signal for driving the piezoelectric element 18. Therefore, the vibration of the piezoelectric element 18 represents an action corresponding to the sound vibration signal. That is, the vibration of the piezoelectric element 18 shows a continuous and smooth action compared to the action corresponding to the square pulse signal, and the vibration mode of the piezoelectric element 18 is diversified.

[0025] The square pulse signal generated by the microcomputer 23 of the first control unit 21 may be a signal of uniform pulse width or a signal of pulse width modulated (i.e., PWM signal). The microcomputer 23 of the first control unit 21 generates a PWM signal, and the vibration of the piezoelectric element 18 vibrating according to the driving signal of the control circuit 20 is modulated, thereby the piezoelectric element 18 can produce a desired sound.

[0026] The first control unit 21 can generate a sound vibration signal related to music as a sound source (DSP sound source), and can reproduce the music through the piezoelectric element 18 .

[0027] The first control unit 21 may also be a combination of the microcomputer 23 and the RC filter 24 as described above. Figure 6 It can be replaced by a microcomputer 23A which can directly output sound vibration signals like the vibration circuit 30B shown in the figure.

[0028] In addition, the microcomputer 23A as the first control unit 21 may also be configured to output a digital sound vibration signal. In this case, the amplifier circuit 22 may include a DA converter, and the digital sound vibration signal output from the microcomputer 23A may be analog-demodulated and amplified in the amplifier circuit 22.

[0029] The present invention is not limited to the above-mentioned embodiments, and various modifications are possible. For example, the first control unit is not limited to a microcomputer, but may be an IC chip such as a timer IC. In addition, the vibration device is not limited to a card, but may be various small parts (fashion items, gadgets, accessories, etc.). The power supply device is not limited to a reader / writer, but may be a settlement terminal, etc.

Claims

1. A vibration device, wherein: have: a power receiving unit that receives contactless power from the power supply device; a control unit that generates a drive signal using the power received by the power receiving unit; and a piezoelectric vibrator that vibrates according to a drive signal generated by the control unit, The control unit includes: a first control unit that generates a sound vibration signal; and a second control unit that amplifies the sound vibration signal generated by the first control unit to generate the driving signal.

2. The vibration device according to claim 1, wherein The first control unit includes a signal generating unit that generates a square pulse signal and a filter unit that performs analog conversion on the square pulse signal generated by the signal generating unit.

3. The vibration device according to claim 2, wherein: The square pulse signal generated by the signal generating unit of the first control unit is a PWM signal.

4. The vibration device according to any one of claims 1 to 3, wherein The vibration device is an IC card.

5. A vibration method for a vibration device, wherein: The vibration device includes a power receiving unit that receives contactless power from a power supply device, a control unit that generates a drive signal using the power received by the power receiving unit, and a piezoelectric vibrator, wherein the control unit includes a first control unit that generates a sound vibration signal, and a second control unit that amplifies the sound vibration signal generated by the first control unit to generate the drive signal. In the vibration device, the piezoelectric vibrator vibrates according to the drive signal generated by the second control unit of the control unit.

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