JPS58154081A - Generator for identification signal - Google Patents

Abstract

PURPOSE:To obtain an identification device which is free from alternation and wear, by forming an oscillation energy field with a high frequency electromagnetic field or an ultrasonic wave and producing an identification signal by a coding circuit, etc. and with absorption of the oscillation energy to use the identification signal as an ID signal. CONSTITUTION:An oscillation energy field 1 is formed previously in a space by a generator of a high frequency electromagnetic field or an ultrasonic wave. An identification signal generator 2 is set close enough to the field 1. Thus the energy of the field 1 is absorbed by a wave receiver 3 to be converted into the DC power through a rectifying circuit 4 and used for the power supply of a frequency converting circuit 5 and a coding circuit 6. The signal supplied from the receiver 3 is used directly as an identification signal and also divided or converted by the circuit 5 in terms of frequency to be supplied to the circuit 6 and to be used as a clock signal. The identification signal produced from the circuit 6 is transmitted to an external reader through a coupler 7 like an antenna, a coil, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an ID (ID) that does not require an identification signal generation IC or a power supply battery, and does not require external reading or direct mechanical contact with the input section of the device. This product relates to identification signal generating devices such as ID cards and electronic locks.

Traditionally, magnetic cards have been most widely used as ID cards, but because the magnetic tape that is the memory part of these magnetic cards is exposed, they are easily scratched, dirty, and easily damaged by speakers. There were disadvantages such as erasure or alteration of the memory contents when brought close to ferromagnetic materials such as. Furthermore, since the structure and principle are simple, it is very easy to read out and tamper with the stored contents, making it extremely difficult to keep the stored contents secret. Moreover,
The magnetic tape must be brought into mechanical contact with the input section of the magnetic card reading device, which has the disadvantage that not only the magnetic tape itself but also the input section of the reading device wears out at the same time.

This invention was devised to solve these drawbacks, and uses a high-frequency electromagnetic field or an ultrasonic frequency in space to generate an identification signal as a clock signal for other encoding circuits. The output code of this encoding circuit is transmitted to an external reading device via a coupler such as an antenna or a coil.

FIG. 1 is a conceptual configuration diagram showing an embodiment of the present invention, in which an identification signal generator (2) is connected to a wave receiver (6), which rectifies the received vibration energy into DC power. a rectifier circuit (4), a frequency conversion circuit (5) that divides or multiplies the received signal and converts the frequency, an encoding circuit (6) that operates using the output of this frequency conversion circuit (5) as a clock signal,
It consists of a coupler (7) such as an antenna coil that sends out an identification signal that is the output of this encoding circuit (6). When the identification signal generator (2) approaches sufficiently the vibrational energy field (1) previously formed in space by a high-frequency electromagnetic field or ultrasonic generator, the field (1) is converted into a frequency converter. (5), the encoding circuit (6), and other circuits as power.

On the other hand, the torrent fraction of the energy of the field (1) received by the receiver (3) can be divided by its good frequency directly (dotted line in Figure 1) or by a frequency conversion circuit (5). After multiplying and converting the frequency, it is supplied to the encoding circuit (6) and used as a clock signal.

The identification signal generated by this encoding circuit (6) is transmitted to an external reading device through a coupler (7) such as an antenna or a coil. When absorbing the energy of field (1) due to high-frequency electromagnetic fields, an antenna or coil is used as the receiver (5), and when absorbing the energy of field (1) due to leprosy waves, a microbon is used as the receiver (5). using a sound receptor like
The output is connected to a diode (e, 9) as shown in Figure 2.
The voltage is doubled and rectified to DC voltage by the capacitors (10, 11), and in some cases, the constant voltage circuit (15) or The voltage is stabilized using a 6-terminal regirator and then supplied to other circuits.

For example, if a branching unit or the like is used in the frequency conversion circuit (5), the input frequency can be extremely easily stepped down to generate a clock signal, and the encoding circuit can be used without using a lock signal source such as a crystal oscillator. (6) can be operated under synchronous control. Of course, it is not always necessary to perform frequency conversion.
The frequency of field (1) may be used directly as a clock signal. Incidentally, if the output driving capability of this encoding circuit (6) is low, as shown in FIG. 6, it is sufficient to connect it to the coupler (7) via a driving circuit (16).

Since the identification signal generating device according to this explanation is configured as described above, it can produce various effects as listed below.

(1) Although it is equipped with an IC, etc., it does not have a built-in battery, so maintenance is easy and economical.

(2) If a microcomputer or the like is used in the encoding circuit (←mother), the number of codes for the identification signal can be dramatically increased, and various processes can be performed to make it multifunctional.

(3) Since all parts can be housed inside the case, the airtight and watertight structure can be achieved, greatly improving environmental resistance.

(4) It is impossible to tamper with the contents of the identification code, it will not disappear due to magnetic fields, etc., and if the encoding method of the identification code or the period of the clock signal is unknown, it can be read and deciphered. This is difficult, and since the position of the coupler (7) can be constructed in such a way that it cannot be seen from the outside, reading is even more difficult.

(5) A receiver (3) that receives field energy from high-frequency electromagnetic fields and ultrasonic waves, and a coupler (7) that outputs an identification code.
) can be relatively loose relative to the external equipment, so mechanical precision is not required, and there is no need for direct contact, so there is no wear or the like.

(6) Since the clock signal of the encoding circuit (6) is generated based on the frequency of Hani 1), the frequency of 5(1) is generated by a crystal oscillator or the like and has extremely stable and highly accurate characteristics. In order to make the clock signal of the same high quality, expensive, large-volume, vibration-resistant crystal oscillators and the like must be installed as clock signal generation elements in all identification signal generation devices. This eliminates the need to do so, which is economical, improves mechanical reliability, and allows the device to be made smaller and lighter.

A coding/decoding IC based on the code 1oop) method that operates in synchronization with a clock signal is used, but the coding circuit (
If the clock signal in 6) is generated by an oscillator using a resistor and a capacitor, correct decoding may be impossible due to poor accuracy and stability of the period (frequency). This kind of situation can be easily avoided using the generation method.1゜(7) Applications are not limited to ID cards and electronic locks, but also include driver's licenses, passports, health insurance cards, automatic telephone bill payment devices, etc. Many are possible and extremely useful.

[Brief explanation of the drawing]

FIG. 1 is a conceptual block diagram showing an embodiment of the identification signal generating device according to the present invention, FIG. 2 is a wiring diagram of a specific example of a rectifier circuit, and FIG. 5 is a block diagram of a specific example of an output section. . 1 High-frequency electromagnetic field or ultrasonic vibration energy field 2 Identification signal generator 3, receiver 4, rectifier circuit 5 Frequency conversion circuit 6, encoding circuit 7, coupler 1:1°

Claims (1)

[Claims] A receiver that receives vibrational energy in a field of vibrational energy formed in space, a rectifier circuit that obtains DC power from the energy received by the receiver, and an AC component of the received energy. A frequency conversion circuit that converts the frequency of the frequency conversion circuit, an encoding circuit that operates using the output of the frequency conversion circuit as a clock signal, and a coupler that transmits the output of the encoding circuit. An identification signal generating device characterized in that the frequency conversion circuit and the encoding circuit are driven by direct current power.