JPH0142030B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an information medium used for identifying oneself and others.

[Technical Background of the Invention] This type of information medium is usually in the form of a card, and has a built-in storage device that stores information unique to itself so that it can be identified, for example, and can be used in response to commands from the outside. It also has the function of sending back its own information stored in the storage device.

On the other hand, on the outside, the information medium is identified by decoding the information sent back.

[Problems in the Background Art] However, in conventional information media, signals are exchanged with external equipment and driving power is supplied to each element built into the information media through electrical contacts provided on the surface. I was worried.

Therefore, since conventional information media require electrical contacts, directionality is required when plugging into external equipment, making them difficult to operate, and contamination of the electrical contacts can cause contact failures and short circuits. It was the cause of lifespan.

In addition, since conventional information media do not have the ability to change the storage contents of the storage device, once self-specific information is stored, that information remains unchanged.
It lacked versatility and had practical limitations.

[Object of the Invention] The present invention provides an information medium that solves the above-mentioned drawbacks.

[Summary of the Invention] The present invention utilizes radio waves, sound waves, light, etc. to send and receive signals to and from external devices, and also incorporates a battery to achieve contactless operation.Furthermore, by providing a function to change memory contents, This realizes an information medium that can be used for a variety of purposes.

[Embodiment of the Invention] Here, an embodiment of the present invention will be described with reference to the drawings, taking as an example a case in which radio waves are used to send and receive signals to and from an external device.

Reference numeral 11 denotes an information medium, for example, in the form of a card, and when it approaches an external device (not shown), a signal sent from the external device is transmitted to the receiving antenna 12.
Receive at. The receiving antenna 12 is built into the information medium 11 and is formed, for example, in a loop shape. The received wave received by the receiving antenna 12 is modulated with binary information indicating each instruction data, information data, etc., and for example, a frequency modulated wave or a phase modulated wave in a medium wave band is used. Note that ISO code, ASCII code, etc. are used as the binary information.

The received wave received by the receiving antenna 12 is supplied to a receiver 13. This receiver 13 is composed of, for example, a bandpass wave generator, an amplifier, etc., and removes noise components of the received wave and amplifies it to a required level. The amplified received wave is demodulated by a demodulator 14 in the next stage, and binary information is extracted. The extracted binary information is introduced into the decoder 15. The decoder 15 terminates the instruction contents and data contents of a series of data sent from the demodulator 14. The contents of the instruction include writing data to and reading data from the storage device 17, erasing stored data, and the like.

The information decoded by the decoder 15 is sent to the controller 1.
6 and decoded by the decoder 15, the data content similarly sent from the decoder 15 is written into the memory 17 or read from the memory 17.

Further, the binary information unique to the information medium, for example, read from the storage device 17 is converted by the modulator 18 into, for example, a modulated wave in a medium wave band. This modulated wave is amplified by a transmitter 19 and sent out from a loop-shaped transmitting antenna 20. On the other hand, the external device receives the transmitted wave from the transmitting antenna 20, identifies the code data unique to the information medium, determines its suitability, and also determines the information stored in the information medium 11.

Further, the battery 21 is built in the information medium 11 and has a thin shape, and is composed of, for example, a lithium battery, a rechargeable nickel-cadmium battery, a solar battery, or the like. Although the wiring state of the battery 21 output is omitted in the drawing, it is used as a driving power source for each device constituting the information medium 11, such as the receiver 13 and the demodulator 14, and is used as a power source for the electronic switch 22. It is supplied to each device through the output end 23.

On the other hand, the electronic switch 22 is controlled by the output of the decoder 15, and for example, during reception,
Power is supplied to the receiver 13 and the demodulator 14;
Further, during transmission, control is performed to supply power to the controller 16, modulator 18, etc. In this way, the configuration is such that power is supplied only to the devices that require it based on the decoding results obtained by the decoder 15, so that battery consumption can be reduced.

In the above embodiment, the transmitting antenna and the receiving antenna are separately provided, but it is also possible to use one antenna for both transmitting and receiving, or each device may be integrated with an integrated circuit or the like. You can also do that.

Furthermore, if information data is expressed using publicly known ISO codes or ASCII codes, there is a risk that the stored contents may be leaked to outsiders.In this case, it is possible to further encode the data when storing it to encrypt the stored data. . Furthermore, in order to exchange signals with external devices, not only radio waves but also light waves, sound waves, etc. can be used.

[Effects of the Invention] As explained above, according to the present invention, since a battery is built-in and information is sent and received using modulated waves such as radio waves, light, and sound waves, electrical contacts are not required, and the length of the information medium can be reduced. Longer service life can be achieved. Furthermore, since the battery is not configured to constantly supply power to each device, and power is selectively supplied only to the devices necessary for each operation, the life of the battery can be extended.

Further, according to the present invention, since there is a function such as changing and erasing the stored contents, it is possible to diversify the applications.

[Brief explanation of drawings]

The drawing is a circuit configuration diagram showing an embodiment of the present invention. 12...Receiving antenna, 21...Battery, 13...
...Receiver, 22...Electronic switch, 14...Demodulator, 18...Modulator, 15...Decoder, 19...
...Transmitter, 16...Controller, 20...Transmission antenna, 17...Storage device.

Claims (1)

[Claims] 1. In a card-shaped information medium that exchanges information with the outside, a receiving means for receiving a signal from the outside, demodulating the received wave received by the receiving means,
a demodulating means for extracting binary information; a decoding means for decoding the binary information output from the demodulating means; a storage control means for controlling writing or reading of information in the storage means based on the output of the decoding means; a modulating means for generating a transmitted wave modulated with information read from the means; a transmitting means for sending the transmitted wave to the outside; a switching means controlled based on the information decoded by the decoding means;
An information medium comprising a battery that selectively supplies driving power to each of the predetermined means by the switching means.