JPH01222392A - Information storing medium - Google Patents

Abstract

PURPOSE:To arrange coils on the same axis by reading or writing data through a data processing circuit which obtains a DC voltage and a data signal by an electromagnetic wave received by a first resonator and drives a second resonator by making the voltage obtained by a rectifier be a power source and the data signal be an input. CONSTITUTION:The first resonator is constituted of the coil 6 for transmitting power and the data and a capacitor 11 for resonance, and the second resonator is constituted of the coil 5 for reading and the capacitor 12 for resonance. The write of the data is performed by receiving a power transmission wave processed by amplitude modulation, frequency modulation or phase modulation by the first resonator through a detector 8, and the read of the data is performed through the second resonator driven by the output of a data processing circuit 9. Then, the coil 6 of the first resonator and the coil 5 of the second resonator are arranged on the same axis, and simultaneously, the resonant frequencies of two resonators are made different. Thus, since as for the read of the data, the frequency of the carrier wave of the data is made to be a value different from the frequency of the power transmission wave, the coils of both the resonators can be arranged on the same axis.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention is a method for writing and reading data in and from a storage device using semiconductor memory such as a memory card and an IC card in a contactless manner without using electrical contacts or the like. The present invention relates to an information storage medium that enables.

2. Description of the Related Art An example of a conventional contactless data input/output method for an IC card is shown in FIG. In FIG. 2, reference numeral 1 denotes an IC card, which contains a power transmission coil 3, a write coil 4, and a read coil 6.

When this IC card 1 is brought close to the read/write unit 2 as shown in FIG. three coils a/
, al, and s/, respectively, to input and output data.

Problems to be Solved by the Invention However, with such a structure, the IC card and the lead/
The positions of the respective coils of the light unit must be precisely aligned, and each coil must be arranged so that it is not magnetically coupled to the adjacent coil. Another problem is that the surface area of the joint becomes large.

The present invention was made in view of the current situation, and an object of the present invention is to enable coils to be arranged on the same axis.

Means for Solving the Problems The technical means of the present invention for solving the above problems is to write data by applying amplitude modulation, frequency modulation, or phase modulation to a power transmission wave and receiving it in a first resonator. The data is read out through a second resonator driven by the output of the data processing circuit, and the coils of the first resonator and the second resonator are placed on the same axis. In addition, the two resonators have different resonant frequencies.

action The effect of this technical means is as follows.

Since data is written by detecting a modulated wave included in a power transmission wave, the power transmission resonator and the data writing resonator can be used in common. When reading data, the frequency of the data carrier wave is set to a value different from the frequency of the power transmission wave, so the coils of both resonators can be placed on the same axis, making it possible to use a single core coil. can.

Example An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, parts having the same functions as those in FIG. 2 are given the same numbers and their explanations will be omitted. The power and data transmission coil 6 and the resonance capacitor 11 constitute a first resonator, and similarly the readout coil 6 and the resonance capacitor 12 constitute a second resonator.

The energy received by the first resonator is rectified by a rectifier 7 and supplied as power to the data processing circuit 9 and the memory element 1o. Read/write unit 2 to wJl
When the resonant frequency of the first resonator is output, the power is turned on by the energy received by the first resonator and waits for command data from the read/write unit 2. The command data is for instructing data writing, reading, data protection, etc. to the memory element 1o, and modulates the power transmission wave using the resonant frequency of the first resonator as a carrier wave, and sends the read/write unit 2 to the memory element 1o. The signal is transmitted by the first resonator, detected by the wave detector 8, and input to the data processing circuit 9. Data written to the memory element 10 is also communicated in the same manner as command data. When the data processing circuit 9 inputs and decodes the command data, it writes and reads the data.

When an instruction to read data is given, the data processing circuit 9 reads the necessary data from the memory element 1o, modulates it at a frequency different from the resonant frequency of the first resonator, and applies it to the second resonator. . 6' is a power and data transmission coil of the read/write unit 2. To modulate and superimpose data on the power transmission wave frequency, amplitude modulation, frequency modulation, phase modulation, etc. can be used. However, when amplitude modulation is used, although the demodulation circuit is simple, the power supply voltage It is necessary to take this into account because the signal is affected (the received power is halved). When frequency modulation and one-phase modulation are used, the demodulation circuit is complicated, but the power supply can be received at a constant level.

Also, although the resonant frequencies of the first resonator 1 and the second resonator are different, since they are arranged on the same axis and are coupled in an alternating current manner, the resonator with the lower resonant frequency acts as a low-cut filter, There is a problem that the power of one of the resonators is absorbed. Therefore, consideration must be given to reducing the number of turns of the coil in one of the resonators or inserting a resistor to keep the current low.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) To write and read data without contact,
There are no problems such as poor contact of contacts.

(2) There is little influence from dirt on the joint, misalignment of dust, etc.

(3) Since the magnetic coupling is limited to one axis, the surface area of the coupling portion is small, making it suitable for compact packaging.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an IC card according to an embodiment of the present invention, and FIGS. 2a and 2b are a perspective view and a sectional view showing a data input/output method of a conventional XC card. 1...IC card, 2...read/write unit, es, s'-...reading coil, 6.6'...power and data transmission coil for,
7... Rectifier, 8... Detector, 9...
...Data processing circuit, 1o...Memory element, 11.12...Resonance capacitor. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
IC card 7・-wan, θ・°-Package n, t2-・-Resonance commenna Figure 1

Claims (2)

[Claims] (1) The first one is arranged on the same axis and has different resonance frequencies.
, a second resonator, a rectifier that obtains a DC voltage from the electromagnetic waves received by the first resonator, a detector that obtains a data signal from the electromagnetic waves received by the first resonator, and a rectifier that obtains a data signal from the electromagnetic waves received by the first resonator. a data processing circuit that uses the obtained voltage as a power source, receives the data signal as an input, and has an output that drives the second resonator;
An information storage medium comprising a nonvolatile memory element that writes and reads data through this data processing circuit. (2) The information storage medium according to claim 1, comprising a memory element and a backup battery instead of the nonvolatile memory element.