JPH0628531A - Signal generation device - Google Patents

Abstract

PURPOSE:To prevent the forgery of a storage content and the abrasion of the device. CONSTITUTION:A sound-receiving body 3 for sound-receiving a sound wave from an external equipment, the energy of the field of a ultrasonic wave, for example, and an encoding circuit 6 where a previously allocated identification code is stored are provided for the signal generation device 2. A rectifier circuit 4 is connected between the sound-receiving body 3 and the encoding circuit 6, and DC power obtained from the energy of the sound wave is given to the encoding circuit 6. A frequency conversion circuit 5 frequency-divides the AC component of energy and it is given to the encoding circuit 6 as a clock signal. The identification code from the encoding circuit 6 is loaded on the sound wave and a radio wave through a connector 7 so as to transmit it.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has an IC or the like for generating data and a signal for identification, but does not have a battery for power supply and does not require direct mechanical contact with the input section of an external reader. The present invention relates to signal generators such as cards and electronic locks.

Conventionally, a magnetic card has been most widely used as an ID card. However, since the magnetic tape as a memory portion is exposed, this magnetic card is easily scratched or soiled. There was a defect that the stored contents disappeared or deteriorated when they were brought close to a ferromagnetic material such as a speaker. Further, since the structure and principle are simple, it is very easy to read or tamper with the stored contents, and it is therefore extremely difficult to keep the stored contents secret. Moreover, the magnetic tape must be mechanically brought into contact with the input unit of the reading device of the magnetic card, and the magnetic tape itself and the reading device input unit are worn at the same time.

In order to solve these drawbacks, there is also known a non-contact type in which an IC for generating an identification number is mounted and an identification signal is sent on a high frequency electromagnetic field and sent out. In this case, the IC is used. Since the clock signal oscillating circuit is required, it becomes expensive and a space for that is required.

SUMMARY OF THE INVENTION It is an object of the present invention to solve these drawbacks, prevent tampering with stored contents, and provide a signal generator which is free from wear and tear due to attachment / detachment of the device to / from external equipment.

[0004]

SUMMARY OF THE INVENTION According to the present invention, there is provided a wave receiving portion which receives the energy of a field of vibration energy including at least a sound wave formed in a space to generate AC power, and the wave receiving portion. A rectifier circuit for converting AC power obtained from the energy of the sonic wave to DC power, and DC power obtained by this rectifier circuit as drive power, based on the AC component of the vibration energy received by the wave receiving unit. An output circuit that outputs a preset signal using the obtained frequency signal as a clock signal, and a coupler that transmits the output signal from this output circuit by adding it to vibration energy for transmission. And

[0005]

When a signal generating device such as a card is placed in a vibration energy field formed by an external device, for example, the energy of the sound wave field is received, and the output circuit operates based on the energy and the sound wave is generated. Alternatively, an output signal such as an identification code is output using the AC component of the radio wave energy as a direct clock signal, for example, and this output signal is sent to an external device along with vibration energy such as sound waves or radio waves.

[0006]

1 is a block diagram showing an embodiment of a signal generator of the present invention. The signal generator 2 of this embodiment includes a sound receiving body 3 as a wave receiving portion that receives energy from a vibration energy field 1 of sound waves such as ultrasonic waves and outputs AC power, and an alternating current from the sound receiving body 3. A rectifier circuit 4 for rectifying electric power into DC power, a frequency conversion circuit 5 for dividing or multiplying the frequency of the AC component of the received vibration energy, and an output of this frequency conversion circuit 5 for operating as a clock signal. An encoding circuit 6 as an output circuit for outputting a predetermined identification signal and a coupler 7 for transmitting the identification signal from the encoding circuit 6 on vibration energy for transmission. Next, the operation of the above embodiment will be described. The above-mentioned signal generator 2 is positioned in a field of vibration energy which is previously formed in space by an ultrasonic wave generator (not shown), for example, in a vibration energy field 1 including a frequency component for a clock signal and a frequency component for a carrier wave. Then, the sound receiving body 3 absorbs the vibration energy and converts it into AC power, and this power is converted into DC power by the rectifier circuit 4 and then used as drive power for the frequency conversion circuit 5, the encoding circuit 6 or other circuits. Given. In addition, the AC component of the vibration energy is directly applied as it is (dotted line connection) or frequency-divided or multiplied by the frequency conversion circuit 5 and guided to the encoding circuit 6 as a clock signal. On the other hand, an identification signal, for example, a code assigned to the person who owns the signal generator is set in advance in the encoding circuit 6, and the identification signal is generated when driven by the DC power. This identification signal is transmitted to the external reading device by being combined with the vibration energy of the radio wave from the coupler 7 including the antenna or the coil, or by being combined with the ultrasonic energy through the ultrasonic transmitter. In this case, as the carrier wave, the frequency component for the carrier wave received by the sound receiving body 3 is used.

Next, a concrete example of the circuit of each part of the device according to the present invention will be described.

A sound receiving body such as a microphone is used as the sound receiving body 3, and its output is rectified by a rectifying circuit 4 composed of diodes 8, 9 capacitors 10, 11 as shown in FIG. Then, if necessary, the voltage is stabilized by the constant voltage circuit 15 and the three-terminal regulator by the resistor 12, the constant voltage diode 13, and the capacitor 14 and then provided to other circuits.

If, for example, a frequency divider is used for the frequency conversion circuit 5, the input frequency is stepped down to generate a clock signal, and the encoding is performed without using a clock signal source such as a crystal oscillator. The circuit 6 can be operated in synchronous control. Of course, it is not always necessary to perform the frequency conversion, and the frequency of the field 1 may be directly used as the clock signal. If the output drive capability of the encoding circuit 6 is low, it may be connected to the coupler 7 via the drive circuit 16 as shown in FIG. The vibration energy of the sound wave for obtaining the DC power and the vibration energy of the sound wave for obtaining the clock signal or the carrier wave may be common or may be separate. The vibration energy for obtaining the clock signal and the carrier wave may be a radio wave. In this case, the wave receiving unit is composed of a sound receiving body and a coil.

Since the signal generator according to the present invention is configured as described above, it can exert various effects as listed below. (1) Maintenance is easy and economical because a drive battery is not built in, although an IC or the like is mounted. (2) If a microcomputer or the like is used for the encoding circuit 15, the number of codes of the identification signal can be dramatically increased and the number of functions can be increased. (3) Since it is not necessary to contact with external equipment, all parts can be housed in the case, so that the structure is airtight and watertight, and the environment resistance can be significantly improved. (4) Since the identification signal and the like are set by the encoding circuit, the microcomputer, etc., it is impossible to tamper with the contents, and the contents are not erased by the magnetic field, etc., and the encoding method of the identification code and the clock signal. Is difficult to read and decode, and the position of the coupler 7 cannot be known from the outside. Therefore, reading is further difficult. (5) Since the position of the wave receiving portion that takes in the field energy by the ultrasonic waves and the position of the coupler 7 that outputs the signal may be relatively loose with respect to the external device, mechanical precision is not required and it is necessary to directly contact them. There is no wear, so there is no wear. (6) The clock signal of the output circuit such as the encoding circuit 6 is
Since it is generated based on the frequency of the field 1, if the frequency of the field 1 has extremely stable and highly accurate characteristics due to a crystal oscillator, etc., not only the clock signal will have the same high quality. It is no longer necessary to mount an expensive crystal oscillator, which has a large volume and is vulnerable to vibrations, as a clock signal generating element on all identification signal generators, which is economical and mechanical reliability is improved. It becomes possible to make it small and lightweight.

When the identification code generated by, for example, the encoding circuit 6 which operates in synchronization with the clock signal is compounded on the receiving side, a PLL (Phase Locke) is generally used.
dLoop) code decoding IC is used, but when the clock signal of the coding circuit 6 is generated by an oscillator using a resistor and a capacitor, the accuracy and stability of the cycle (frequency) is poor, and the normal decoding is performed. However, such a situation can be easily avoided by the method for generating a clock signal according to the present invention.

Further, since the driving power uses the energy of the sound wave, there is no limitation in the power, and therefore the energy of the sound wave can be increased, so that a large driving power can be obtained while the receiving unit is downsized.

In the above, the present invention can be applied not only to ID cards and electronic locks but also to many things such as licenses, passports, health insurance cards, and automatic telephone charge payment devices.

[Brief description of drawings]

FIG. 1 is a conceptual block diagram showing an embodiment of an identification signal generator according to the present invention.

FIG. 2 is a connection diagram showing a specific example of a rectifier circuit.

FIG. 3 is a block diagram showing a specific example of an output unit.

[Explanation of symbols]

 1 ... Field of vibration energy by ultrasonic waves 2 ... Signal generator 3 ... Sound receiver 4 ... Rectifier circuit 5 ... Frequency conversion circuit 6 ... Encoding circuit 7 ... Coupler

Claims (1)

[Claims] 1. A wave receiving portion that receives AC energy of a vibration energy including at least a sound wave formed in a space to generate AC power, and an energy of a sound wave received by the wave receiving portion. A rectifier circuit that converts the obtained AC power into DC power, and the DC power obtained by this rectifier circuit as the drive power,
A frequency signal obtained based on the AC component of the vibration energy received by the wave receiving unit is used as a clock signal, and an output circuit that outputs a preset signal, and an output signal from this output circuit is used as the vibration energy. A signal generator comprising a combiner for carrying and transmitting the signal.