JPH0822634B2 - Information card - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to office automation (Office Aut).
omation, OA), Factory Automation (Fact
information cards such as IC cards used in fields such as ory automation (FA), especially non-power sources (without batteries) without contact terminals for power supply and signal input / output, non-contact type capacitive coupling power supply The present invention relates to a contactless transmission / reception type information card.

(Prior Art) In a general information card, an integrated circuit such as a semiconductor memory is built in a card body made of plastic or the like, and a contact terminal with an external device is provided on the card surface.

Hitherto, as technologies in such a field, Nikkei Mechanical, (1985-10-21) Nikkei McGraw-Hill Company [IC card] P.167-170, Nikkei Electronics, (1985-12
-2) Nikkei McGraw-Hill, "Electronics manufacturer that flows into the IC card market (above)" P.275-292, Nikkei Electronics, (1985-12-6) Nikkei McGraw-Hill, "Electronics manufacturer that flows into the IC card market (below) ) ”P.249-262. The configuration will be described below with reference to the drawings.

FIG. 2 is a block diagram showing a configuration example of a conventional information card, and FIG. 3 is a perspective view showing an implementation example thereof.

In FIG. 2, an external device 1 for reading and writing information and an information card 2 are provided, and DC power supplies VC and E are supplied from the external device 1 to the information card 2 and the external device is also provided. Input and output signals between 1 and information card 2
I / O1 to I / On can be exchanged.

As shown in FIGS. 2 and 3, the information card 2 has a rectangular card body 3 made of plastic or the like. The card body 3 has a plurality of power sources and signals exposed on its surface. The contact type terminal 4 is provided, and an electronic integrated circuit (hereinafter referred to as IC) 5 is provided inside. IC5
Has a semiconductor memory 6 and a microprocessor 7 which controls writing and reading of information to and from the memory 6.

When this type of information card 2 is inserted into the external device 1, the terminal 4 on the card 2 side comes into contact with the terminal on the external device 1 side, and the information stored in the memory 6 is passed through these terminals 4 and the like to the external device 1. 1 or read the information on the external device 1 side into the memory 6.

(Problems to be Solved by the Invention) However, in the information card having the above configuration, the terminal 4
Is exposed to the outside, so this terminal contact part is
There was a problem in reliability due to contact failure due to oxidation, corrosion, abrasion, malfunction due to leak current, and IC5 breakdown due to static electricity and external voltage.

Therefore, in order to solve such a problem, for example, it is conceivable to use the card reading system technology described in Japanese Patent Laid-Open No. 59-60783. In this card reading method, a plurality of terminals for electrostatic coupling are built in the information card,
This is a technology for exchanging information by electrostatic coupling through this terminal.

If such a technique is used, signals can be exchanged with an external device without power supply and without contact, so that the above-mentioned problems may be solved. However, from an external device,
When transmitting power to an information card via a plurality of terminals for electrostatic coupling, in order to perform efficient power transmission, the flat area of those terminals must be increased to some extent,
As a result, it becomes difficult to achieve high integration of the internal circuit of the information card, and new problems such as a decrease in the efficiency of power transmission due to electrical interference between the terminals occur. It was difficult to get.

The present invention solves these problems and provides an information card with high power transmission efficiency and high reliability in which the internal circuits can be highly integrated.

(Means for Solving Problems) In order to solve the above problems, the present invention relates to a transmission signal / electric signal converter for converting an input transmission signal into an electric signal, a memory for storing information, A memory control circuit that controls the operation of the memory based on the electrical signal converted by the transmission signal / electrical signal converter, and an electrical signal that converts the electrical signal output from the memory control circuit into a transmission signal and outputs the transmission signal. A transmission signal converter, a first electrode plate and a second electrode plate that are supplied with AC power by capacitive coupling, and the first electrode.
In the information card including the electrode plate and the power supply circuit for converting the AC power supplied through the second electrode plate into the DC power, the following means are taken.

That is, in the present invention, the first electrode plate and the second electrode plate are arranged so as to be separated from each other on substantially the same plane, and the first electrode plate and the second electrode that are arranged so as to be separated from each other. The memory, the memory control circuit, and the power supply circuit are arranged on the same plane between the board and the board.

(Operation) According to the present invention, since the information card is configured as described above, when AC power is supplied from the outside, this AC power is supplied to the inside of the information card by the first electrode plate and the second electrode plate. Entered in. At this time, since the first electrode plate and the second electrode plate are arranged on the substantially same plane and separated from each other, an electrical connection is made between these first electrode plate and the second electrode plate. Interference does not occur,
Efficient power transmission is performed. The input AC power is converted into DC power by the power supply circuit, and then supplied to each circuit in the information card to operate each of these circuits.

When a transmission signal such as an optical signal is input from the outside, the transmission signal is converted into an electric signal by the transmission signal / electrical signal converter. Based on this electrical signal, the memory control circuit reads the stored information from the memory and writes the information to the memory. The electric signal output from the memory control circuit is converted into a transmission signal such as an optical signal by the electric signal / transmission signal converter and sent to the outside.

In this information card, a memory, a memory control circuit, and a power supply circuit are arranged on the same plane between a first electrode plate and a second electrode plate which are arranged on the same plane and are separated from each other. Therefore, the internal circuit of the information card can be highly integrated. Therefore, the above problem can be eliminated.

(Embodiment) FIG. 1 is a schematic configuration diagram of an information card showing an embodiment of the present invention.

In FIG. 1, the information card 20 is inserted into the external device 10.

The external device 10 has an oscillation circuit 11 that generates power for power supply, and a first electrode plate 13 for capacitive coupling is connected to the oscillation circuit 11 via an amplifier circuit 12. Further, the external device 10 includes a second polar plate 14 for return line, an electric signal / transmission signal converter (E / E / E) for converting the input signal S _i into a transmission signal S _x1 such as an optical signal.
X _t ) 15 and a transmission signal / electrical signal converter (X / E _t ) 16 for converting the transmission signal S _x2 such as an optical signal into an electric signal and transmitting the output signal S _o . The first electrode plate 13 and the second electrode plate 14 are arranged on substantially the same plane and separated from each other.

On the other hand, the information card 20 has a substantially rectangular card body 21 made of plastic or the like, and in the card body 21, a first electrode plate 22, a second electrode plate 23, a power supply circuit 24, transmission signal / electrical signal converter (X / E _c) 25, the memory control circuit 26, a memory 27, and an electrical signal / transmission signal converter (E / X _c) 28 is provided.

Here, the first electrode plate 22 and the second electrode plate 23 are external devices.
A power transmission system is configured by capacitively coupling with the electrode plates 13 and 14 on the 10 side, and is supplied with AC power from the external device 10 side, and the received AC power is stabilized by the power supply circuit 24 to a DC voltage. It is converted to V _dc and supplied to each circuit in the card body 21 as a power supply voltage. First plate
The second electrode plate 22 and the second electrode plate 23 are arranged on the substantially same plane and separated from each other, as shown in FIG.
Of the power supply circuit 24, the transmission signal / electrical signal converter 25, and the memory control circuit on the same plane between the electrode plate 22 and the second electrode plate 23.
26, a memory 27, and an electrical signal / transmission signal converter 28 are arranged.

The transmission signal / electrical signal converter 25 is a circuit that converts the transmission signal S _x1 such as an optical signal output from the electric signal / transmission signal converter 15 on the external device 10 side into an electric signal and gives it to the memory control circuit 26. is there. The memory control circuit 26 is composed of a microprocessor having functions of, for example, a central processing unit (CPU) and an input / output device, and controls the reading and writing of the memory 27 by inputting the output signal of the transmission signal / electrical signal converter 25. Is a circuit that performs. The memory 27 is a circuit that stores various kinds of information, and includes a read-only memory (ROM) and a writable ROM (PRO
M), an electrically erasable and writable ROM (EEPROM), an ultraviolet erasable and writable ROM (EPROM), and the like.
Further, the electric signal / transmission signal converter 28 is a memory control circuit.
It is a circuit that converts the output signal of 26 into a transmission signal S _x2 such as an optical signal and sends this to the transmission signal / electrical signal converter 16 on the external device 10 side. Each circuit inside these card body 21 is IC,
It is composed of an optical IC, an optoelectronic integrated circuit (hereinafter referred to as OEIC), and the like.

 Next, the operation will be described.

The input signal S _i in the external device 10 is an initial set (initial setting) of the memory control circuit 26 on the information card 20 side, a control signal for reading and writing information, and a signal to be written in the memory 27 serially (serially). ) Has been converted.

When the information card 20 is inserted into such an external device 10,
The AC power output from the oscillator circuit 11 on the external device 10 side is supplied to the information card 20 side through the electrode plates 13 and 22.
This AC power is a DC voltage V stabilized by the power supply circuit 24.
After being converted to _dc , it is supplied as power to each circuit in the card body 21. Further, after the input signal S _i of the external device 10 is converted into a predetermined transmission signal S _x1 by the electric signal / transmission signal converter 15, the transmission signal / electric signal converter 25 on the information card 20 side is transmitted.
Is supplied to.

The transmission signal S _x1 input to the information card 20 is converted into an electric signal by the transmission signal / electrical signal converter 25, and then supplied to the memory control circuit 26. In the memory control circuit 26, based on the input electric signal, when the signal includes read information, for example, an address is designated and the record information is read from the memory 27. The stored information is converted into a predetermined transmission signal S _x2 by the electric signal / transmission signal converter 28 and sent to the transmission signal / electric signal converter 16 on the external device 10 side.

The transmission signal / electrical signal converter 16 receives the input transmission signal.
S _x2 is converted into an electric signal, and the read signal of the memory 27, the operation confirmation signal inside the information card, and the like are sent out as an output signal S _o .

FIGS. 4 to 18 show a concrete example of the configuration of the information card of FIG. 1, in which (i) FIGS. 4 to 6 are information cards of the capacitive coupling power feeding / optical transmission / reception system, ii) FIGS. 7 to 9 are information cards of capacitive coupling feeding / magnetic coupling transmission / reception system, (iii) FIGS. 10 to 12 are information cards of capacitive coupling feeding / ultrasonic transmission / reception system, (iv) 13 Figures 15 to 16 are information cards of capacitive coupling power supply, optical transmission, ultrasonic reception method, 16th
Figures 18 to 18 show information cards of a capacitively coupled power feeding / capacitively coupled transmission / reception system, and their configurations will be described below.

(I) Information Card of Capacitively Coupled Power Supply / Optical Transmission / Reception System of FIGS. 4 to 6 FIG. 4 is a circuit configuration block diagram.

In the external device 10, the electric signal / transmission signal converter 15,
Light emitting element drive circuit 15-1, light emitting element 15-2 such as light emitting diode which outputs optical signal OPT 1, and lens 15 for light transmission
-3, and the transmission signal / electrical signal converter 16 is
A lens 16-1 for receiving light, a light receiving element 16-2 such as a photodiode for receiving the optical signal OPT 2, and a light receiving amplification circuit 16-3.
It is composed of

Corresponding to the external device 10, the transmission signal / electrical signal converter 25 on the information card 20 side is an optical signal similar to the external device 10 side.
Light receiving element 25-1 for receiving OPT 1 and light receiving amplification circuit 25−
In addition, the electric signal / transmission signal converter 28 is also composed of a light receiving element drive circuit 28-1 and a light emitting element 28-2 that outputs an optical signal OPT 2. The power supply circuit 24 including these circuits 25 and 28, the memory control circuit 26, and the memory 27 are composed of, for example, the OEIC 30-1.

FIG. 5 is a perspective view showing a mounting example of the information card 20 in FIG. 4, and FIG. 6 is a perspective view showing a configuration example of the OEIC 30-1 and the electrode plates 22 and 23 in FIG.

Card body 21 made of plastic or the like for storing the OEIC30-1
In the above, in the passages of the optical signals OPT 1 and OPT 2, a hole is opened or a transparent film is provided so that the light rays can be transmitted.

In the above configuration, the AC power on the external device 10 side is the electrode plate.
It is given to the power supply circuit 24 on the information card 20 side through 13, 22 and is converted into the power supply voltage V _dc by this power supply circuit 24 and applied to each circuit in the card body 21.

On the other hand, the drive circuit 15-1 on the external device 10 side receives the input signal S _i
The light emitting element 15-2 is caused to emit light based on the above, and the input signal S _i is converted into an optical signal OPT 1 and then applied to the light receiving element 25-1 on the information card 20 side through the lens 15-3. Then, the light receiving element
Since 25-1 receives the optical signal OPT 1 and converts it into an electric signal, the electric signal is supplied to the memory control circuit 26 after being amplified by the received light amplification circuit 25-2. Memory control circuit
26 writes information in the memory 27, for example, and gives this write confirmation signal to the light emitting element drive circuit 28-1. Drive circuit 28-
No. 1 emits the light emitting element 28-2 to convert the writing confirmation signal into the optical signal OPT 2 and sends it to the lens 16-1 on the external device 10 side.

The optical signal OPT 2 passing through the lens 16-1 is received by the light receiving element 16-
It is converted into an electric signal in 2 and is amplified in the light receiving / amplifying circuit 16-3 and output as an output signal S _o .

(Ii) Information card of the capacitively coupled power feeding / magnetically coupled transmission / reception system of FIGS. 7 to 9, FIG. 7 is a circuit configuration block diagram, and FIG. 8 is a perspective view showing an implementation example of the information card 20 of FIG. And FIG. 9 is a perspective view showing a configuration example of the main part of FIG.

Each electric signal / transmission signal converter 15, 28 in this circuit
Are modulation circuits 15-11, 28-11, amplification circuits 15-12, and
28-12 and magnetic coupling coils 15-13, 28-13, and each transmission signal / electrical signal converter 16, 25 includes a magnetic coupling coil 16-11, 25-11 and a demodulation circuit 16-2, respectively. ,twenty five
It consists of −12. These circuits 25-12, 28-11, 28
Power supply circuit 24 including −12, memory control circuit 26, and memory
27 is composed of IC30-2.

In the above configuration, the external device 10 has a modulation circuit 15-11.
Modulates the input signal S _i into a transmission signal, amplifies this signal by the amplifier circuit 15-12, and supplies it to the information card 20 side through the coils 15-13 and 25-11. Then, the demodulation circuit 25-12 on the information card 20 side demodulates the output of the coil 25-11 and gives it to the memory control circuit 26. Similarly, the output signal of the memory control circuit 26 is modulated by the modulation circuit 28-11, amplified by the amplification circuit 28-12, and then passed through the coils 28-13 and 16-11 to the demodulation circuit 16-on the external device 10 side. Given to twelve. The demodulation circuit 16-12 demodulates the output of the coil 16-11 and outputs the output signal S _o .

(Iii) Information card of capacitive coupling power supply / ultrasonic wave transmission / reception system of FIGS. 10 to 12, FIG. 10 is a circuit configuration block diagram, and FIG. 11 is a perspective view showing an implementation example of the information card 20 in FIG. And Fig. 12
FIG. 12 is a perspective view showing a configuration example of a main part of FIG.

As shown in FIG. 10, each electric signal / transmission signal converter 15 and 28 of this circuit includes a modulation circuit 15-21, 12-21, an ultrasonic wave generator driving circuit 15-22, 28-22, and Ultrasonic signal S
Ultrasonic wave generation element 15 consisting of electrostrictive oscillator etc. that outputs 1 and S2
-23, 28-23, and each transmission signal / electrical signal converter 16, 25 is an ultrasonic receiving element 1 such as an electrostrictive transducer.
6-21, 25-21 and demodulation circuits 16-22, 25-22. The power supply circuit 24, the memory control circuit 26, and the memory 27 in the card body 21 including these circuits 25 and 28 are the IC 30-3.
It is composed of

Further, as shown in FIGS. 11 and 12, the card body 21 that houses the IC 30-3 has a hole for passage of ultrasonic signals S1 and S2, or is formed of a material through which ultrasonic signals can pass. Has been done.

In the above configuration, the external device 10 has a modulation circuit 15-21.
Converts the input signal S _i into a transmission signal, and based on this signal, the drive circuit 15-22 causes the ultrasonic wave generation element 15-23 to generate an ultrasonic wave signal.
Output S1. Then, the ultrasonic receiving element 25-21 on the side of the information card 20 converts the ultrasonic signal S1 into an electric signal, and this electric signal is demodulated by the demodulation circuit 25-22 to be stored in the memory control circuit.
Given to 26. Similarly, the output signal of the memory control circuit 26 is modulated by the modulation circuit 28-21 and sent as the ultrasonic signal S2 by the drive circuit 28-22 and the ultrasonic wave generation element 28-23. This signal S2 is converted into an electric signal by the ultrasonic receiving element 16-21, demodulated by the demodulation circuit 16-22, and sent out in the form of an output signal S _o .

(Iv) Capacitively coupled power feed / optical transmission / ultrasonic wave reception type information card shown in FIGS. 13 to 15. FIG. 13 shows a circuit configuration block diagram, and FIG. 14 shows a mounting example of the information card 20 in FIG. Fig. 15 is a perspective view and Fig. 15 is
FIG. 15 is a perspective view showing a configuration example of a main part of FIG.

An electrical signal by the circuit is a transmission system of the input signal S _i /
The transmission signal converter 15 and the transmission signal / electrical converter 25 are
In the ultrasonic transmission system of FIG. 10, the electrical signal / transmission signal converter 28 and the transmission signal / electrical signal converter 16 which are transmission systems of the output signal S _o are respectively configured by the optical signal transmission system of FIG. Has been done. All circuits on the information card 20 side are made up of OEIC30-4 except for the polar plates 22 and 23.
21 has a hole for passage of the ultrasonic signal S1 and the optical signal OPT 2,
Alternatively, it is formed of a material through which these signals S1 and OPT2 can pass.

(V) Information card of capacitively coupled power feeding / capacitively coupled transmission / reception system of FIGS. 16 to 18 FIG. 16 is a circuit configuration block diagram, FIG. 17 is a perspective view showing an example of mounting the information card 20 in FIG. 16, And Fig. 18 shows
FIG. 18 is a perspective view showing a configuration example of a main part of FIG. 17.

In this circuit, each electric signal / transmission signal converter 15,28
Are the modulation circuits 15-31, 28-31, the amplification circuits 15-32,
28-32 and electrode plates 15-33, 28-33,
Each transmission signal / electrical signal converter 16, 25 has a pole plate 16
-31, 25-31 and demodulation circuits 16-32, 25-32. Further, the capacitively-coupled plates 14 and 23 provided on the external device 10 side and the information card 20 side are provided with power and input / output signals S _i , S _o.
Form the return line of the transmission system. The circuits in the card body 21 are all composed of the IC 30-5 except for the polar plates 22, 23, 25-31 and 28-33.

In the above configuration, the input signal S _i on the external device 10 side is
After being modulated by the modulation circuit 15-31 and amplified by the amplification circuit 15-32, it is given to the information card 20 side through the capacitively coupled polar plates 15-33, 25-31. Demodulation circuit on the information card 20 side 25-32
Then, the output of the electrode plates 25-31 is demodulated and given to the memory control circuit 26. Similarly, the output of the memory control circuit 26 is the modulation circuit.
The signal is modulated by the transmission signal 28-31, amplified by the amplifier circuit 28-32, and then given to the external device 10 side through the capacitively coupled polar plates 28-33, 16-31. Then, the demodulation circuit on the external device 10 side
The 16-32 demodulates the output of the electrode plate 16-31 and sends the output signal S _o .

 The above embodiments have the following advantages.

Since the first electrode plate 22 and the second electrode plate 23 for inputting AC power from the external device 10 by capacitive coupling are arranged on substantially the same plane and are separated from each other, these first electrodes are separated. Board
Electrical interference between the second electrode plate 22 and the second electrode plate 23 does not occur, and efficient power transmission becomes possible. Moreover, the power supply circuit 24, the memory control starting circuit 26, the memory 27, and the like are provided on the same plane between the first electrode plate 22 and the second electrode plate 23 that are spaced apart on the same plane. Since they are arranged, the internal circuit of the information card 20 can be highly integrated.

Unlike the conventional Fig. 3, the terminals of the internal circuit are not exposed to the outside, and power can be supplied and signals can be input and output without contact, so contact due to contamination of terminals, oxidation, corrosion, wear, etc. There is no effect of defects. Furthermore, there is no failure or malfunction due to leakage current, and there is no need to protect external devices or internal circuits due to static electricity. Therefore, high reliability can be obtained.

The completely sealed structure improves explosion-proof and waterproof properties. Therefore, it can be applied not only to ordinary OA equipment and FA equipment, but also to equipment in a bad environment or a place where explosion-proof measures are required.

 Since there is no need to replace the batteries, usability is improved.

The present invention is not limited to the illustrated embodiment, and various modifications can be made. For example, the signal transmission can be configured by another transmission method such as radio transmission, and each circuit in the card body 21 can be configured by another circuit.

(Effect of the Invention) As described in detail above, according to the present invention, the first electrode plate and the second electrode plate for inputting electric power from the outside by the capacitive coupling are separated from each other on substantially the same plane. Since they are arranged in such a manner, electrical interference between these first electrode plate and the second electrode plate does not occur, and efficient power transmission becomes possible. Moreover, since the memory, the memory control circuit, and the power supply circuit are arranged on the same plane between the first electrode plate and the second electrode plate which are arranged on the same plane and are separated from each other, High integration of the internal circuit of the card becomes possible. Therefore, a highly integrated and highly reliable information card can be realized without causing electrical interference between the first electrode plate and the second electrode plate.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an information card showing an embodiment of the present invention, FIG. 2 is a configuration block diagram of a conventional information card, and FIG.
2 is a perspective view showing the mounting example of FIG. 2, FIG. 4 is a block diagram showing a configuration of an information card of a capacitive coupling power supply / optical transmission / reception system embodying FIG. 1, and FIG. 5 is a diagram of the information card of FIG. FIG. 6 is a perspective view showing a mounting example, FIG. 6 is a perspective view showing a configuration example of a main part of FIG. 5, and FIG. 7 is a configuration block diagram of an information card of a capacitive coupling power feeding / magnetic coupling transmitting / receiving system which embodies FIG. FIG. 8 is a perspective view showing an example of mounting the information card of FIG. 7, FIG. 9 is a perspective view showing an example of the configuration of the main part of FIG. 8, and FIG. 10 is a capacitive coupling power supply embodying FIG.・ Structural block diagram of an ultrasonic transmission / reception type information card, FIG. 11 is a perspective view showing a mounting example of the information card of FIG. 10, FIG. 12 is a perspective view showing a structural example of a main part of FIG. 11, The figure is a block diagram of the configuration of the information card of the capacitive coupling power supply / optical transmission / ultrasonic reception system that embodies FIG. FIG. 4 is a perspective view showing an example of mounting the information card shown in FIG. 13, FIG. 15 is a perspective view showing an example of the configuration of the main part of FIG. 14, and FIG. 16 is a capacitive coupling power supply system embodying FIG.
FIG. 17 is a block diagram showing the configuration of an information card of the capacitive coupling transmission / reception system, FIG. 17 is a perspective view showing a mounting example of the information card of FIG. 16, and FIG. 18 is a perspective view showing a configuration example of essential parts of FIG. 10 …… External device, 11 …… Oscillation circuit, 12 …… Amplification circuit, 1
3,14,22,23 …… polar plate, 15,28 …… electric signal / transmission signal converter, 16,25 …… transmission signal / electric signal converter, 20 …… information card, 21 …… card body, 24 …… power supply circuit, 26 ……
Memory control circuit, 27 ... Memory, 30-1,30-4 ... OEI
C, 30-2, 30-3, 30-5 ... IC.

Claims (6)

[Claims] 1. A transmission signal / electrical signal converter for converting an input transmission signal into an electric signal, a memory for storing information, and the memory based on the electric signal converted by the transmission signal / electrical signal converter. A memory control circuit for controlling the operation of the device, an electric signal / transmission signal converter for converting an electric signal output from the memory control circuit into a transmission signal, and outputting the transmission signal; An information card, comprising: a polar plate and a second polar plate; and a power supply circuit that converts alternating-current power supplied through the first polar plate and the second polar plate into direct-current power. The electrode plate and the second electrode plate are arranged so as to be separated from each other on substantially the same plane, and the first plate and the second electrode plate are arranged so as to be separated from each other on the same plane. , The memory,
An information card comprising the memory control circuit and the power supply circuit. 2. The scope of claim 1, wherein the transmission signal / electrical signal converter comprises a light receiving element and a light receiving amplification circuit, and the electric signal / transmission signal converter comprises a light emitting element drive circuit and a light emitting element. Information card. 3. The transmission signal / electrical signal converter is constituted by a magnetic coupling coil and a demodulation circuit, and the electric signal / transmission signal converter is constituted by a modulation circuit, an amplification circuit and a magnetic coupling coil. Information card described in section. 4. The transmission signal / electrical signal converter comprises an ultrasonic receiver and a demodulation circuit, and the electric signal / transmission signal converter comprises an ultrasonic wave generating element.
Information card described in section. 5. The transmission signal / electrical signal converter comprises an ultrasonic wave receiver and a demodulation circuit, and the electric signal / transmission signal converter comprises a light emitting element drive circuit and a light emitting element, respectively. Information card described. 6. The claim according to claim 1, wherein the transmission signal / electrical signal converter is constituted by a polar plate and a demodulation circuit, and the electric signal / transmission signal converter is constituted by a modulation circuit, an amplification circuit and a polar plate. Information card.