JPS62253882A - Remote data discriminating system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is a remote data identification method for granting permission to enter a room, for example, to a person carrying an identification card. [Prior Art] When entering or exiting a facility, or when moving parts or the like are being carried in or out, it may be necessary to identify data unique to the person or the part, such as checking an entry password. Most of this data identification method is the so-called insertion contact method, in which a punch card or an identification card using a magnetic recording medium is inserted into a reader and its unique data is read, but a small number of methods include, for example, A so-called wireless transmission system with a built-in battery, as disclosed in Japanese Patent Application Laid-Open No. 58-151572, has been adopted. This is a system in which a battery and a transmitter are built into the identification card, and the identification data is transmitted as an identification signal via radio waves to a discriminator that collates and discriminates the data.The identification card is carried by the person. It is also used by attaching it to moving objects.

(Problems to be Solved by the Invention) However, the conventional data identification methods described above have various problems in terms of operability and performance. The device must be inserted into the reader each time the reader enters or leaves the room, making it cumbersome to operate and prone to mechanical or magnetic damage.Furthermore, wireless transmission systems have a built-in battery. Therefore, regular maintenance inspections such as battery replacement were required, and there were performance problems such as malfunction due to battery deterioration.

This invention was made to solve these problems, and aims to provide a remote data identification method that is easy to operate, is contactless, has no mechanical or magnetic damage, and has stable performance. The purpose is

[Means for solving problems]

The remote data identification method of the present invention includes a power supply circuit, a high-frequency power generation circuit, and a resonant circuit that oscillates at a constant frequency using the high-frequency power in the base unit, and resonates at the same frequency as the resonant circuit of the base unit. The slave device is equipped with a resonant circuit that converts the high-frequency power received from the parent device using this resonant circuit and a rectification stabilization circuit that converts the high-frequency power received from the parent device into stable DC power, and generates a unique data signal using the DC power. A signal generation circuit is provided to apply a modulating effect to the resonant circuit of the slave unit using the data signal, and a detection demodulator that detects and demodulates the modulated signal generated in the resonant circuit of the base unit; The base device is equipped with a verification and discrimination circuit that discriminates the unique data.

[Effect]

When a child device approaches a parent device, the resonance circuit of the child device, which is electromagnetically coupled to the parent device's resonant circuit, resonates, and high-frequency power is generated in this circuit. When the rectifying and stabilizing circuit converts this high frequency power into DC power and supplies power to the data signal generating circuit, Data I No. 2 is outputted from there and a modulation effect is applied to the resonant circuit of the slave unit. As a result, a change:A signal is generated in the resonant circuit of the base unit, and this signal is inputted to the verification and discrimination circuit through the detection demodulator, where the unique data of the slave unit is identified. In this way, the child unit does not have a built-in power supply, but receives high-frequency power from the parent unit and uses it as its driving power, so it has good performance and is easy to operate because it can be identified without contact. .

(Example) An example of the present invention will be described below with reference to the drawings. In Figure 1, 1 is a master unit installed at checkpoints such as campus gates and room entrances, and 2 is a slave unit formed as an identification card, which is carried by people or attached to moving objects. be done.

The base unit 1 includes a power supply circuit 3, a high-frequency power generation circuit 4 that generates high-frequency power, and a base unit resonance circuit 5 that oscillates at a constant frequency using the high-frequency power, and further includes a modulated signal generated in the resonance circuit 5, which will be described later. A detection demodulator 6 detects and demodulates the signal, and a verification/discrimination circuit 7 collates the demodulated signal to determine unique data of the handset 2. The slave unit 2 also has a slave unit resonance circuit 8 which resonates at the same frequency as described above when electromagnetically coupled with the base unit resonance circuit 5, and converts the high frequency power received from the base unit 1 through this resonance circuit 8 into a stable DC A rectifying and stabilizing circuit 9 that converts into electric power, a data signal generating circuit 10 that uses the DC power to generate a data signal specific to the slave unit 2, and a data signal output from this circuit 10 that outputs 0N-O.
It is equipped with a transmission switch circuit 11 that turns FF. and,
The output of the switch circuit 11 gives a modulation effect to the child device resonance circuit 8, which gives a modulation effect to the child device resonance circuit 8, and thereby generates the above-mentioned variable 8 signal in the parent device resonance circuit 5. .

The high-frequency power generation circuit 4 has an oscillation circuit inside, and the parent unit resonant circuit 5 and slave unit resonant circuit 8 that operate in oscillation are both composed of a coil and a capacitor.
When the parent Ja1 and slave unit 2 approach each other, they are coupled by electromagnetic induction as shown by the contacts in the figure. The detection demodulator 6 consists of a detection diode, a filter circuit, an amplification circuit, a waveform shaping circuit, etc., and the collation discrimination circuit 7 for discriminating its output signal consists of a decoder, a program switch, and peripheral circuits, and similarly generates a data signal. The circuit 10 also includes an encoder, a program switch, and peripheral circuits. Further, the transmission switch circuit 11 has a built-in transistor and is configured to be turned on and off by a digital signal that is a data signal from the data signal generation circuit 10, thereby modulating the child device resonance circuit 8.

Next, the operation will be explained. When the handset 2 approaches the base unit 1, the handset 2 receives power without contact, and uses this power as a driving power source to transmit an identification signal from the handset 2 to the base unit 1.
The base unit 1 collates and discriminates the identification signal, which is the unique data of the slave unit 2. At this time, first, the high-frequency power generation circuit 4, which receives operating power from the power supply circuit 3, generates unmodulated high-frequency power using a built-in oscillation circuit to operate the main unit resonance circuit 5. When the parent device resonance circuit 5 receives the unmodulated high-frequency power and excavates at a certain frequency, the slave device resonance circuit 8 is configured to excavate at the same frequency.
Due to the approach of , electromagnetic inductive coupling occurs in both resonant circuits 5 and 8, and high frequency power is transmitted and received.At this time,
The high frequency power obtained by the handset resonance circuit 8 is converted into stable DC power by a rectification and stabilization circuit 9, and is supplied to the data signal generation circuit 10 as an operating power source. The data signal generation circuit 10 is composed of, for example, a 10-bit encoder (LSI), 10 sets of program switches, and peripheral circuits, and converts preset unique data of the handset 2 into digital signals, that is, logic circuits ro'', rl. ” will be sent. In this digital signal, for example, "0" can be expressed as a pulse signal with a time width of 1 m5 ec, and "1" can be expressed as a pulse signal with a time width of 3 m5 ec. Then, the data signal generation circuit 10
The digital signal (data signal) emitted from the transmitter turns on the transistor of the transmission switch circuit 11.

When the transistor is turned OFF and turned ON, the child device resonance circuit 8 is short-circuited and its impedance is reduced. That is, the child device resonant circuit 8 receives a change in impedance according to the digital signal, and this modulation effect is transmitted to the parent device resonant circuit 5 to which electromagnetic induction is coupled. When changing the circuit impedance of the handset resonant circuit 8 using the transistor of the transmission switch circuit 11, there are various methods such as directly short-circuiting the circuit, using a diode, or using elements such as an inductor, capacitor, and resistor. be.

When the parent unit resonant circuit 5 connected by the electromagnetic induction coupling is influenced by the slave unit resonant circuit 8, its impedance changes and is similarly modulated by the digital signal to generate a modulated signal. This modulated signal is guided to the detection demodulator 6, where it is restored as a clear digital signal according to the unique data of the handset 2 by built-in detection diodes, filter circuits, amplifier circuits, waveform shaping circuits, etc. Then, this restored signal is collated and discriminated by a collation/discrimination circuit 7, and a discrimination signal such as permission to enter is outputted based on the collation result.

At this time, the collation and discrimination circuit 7 uses, for example, a 10-bit decoder (
(LSI), 10 sets of program switches and peripheral circuits; in this case, data signal generation circuit 1
It is possible to match 1024 types of data corresponding to 0 data. Further, by increasing the number of bits of the encoder, decoder, and program switch used in the data signal generation circuit 10 and the verification/determination circuit 7, it becomes possible to transmit and verify more data.

In the above embodiment, the data signal generation circuits lO to r
Digital signals of "Q" and "rl" are transmitted, and the modulated signal by this signal is restored and verified by the verification/discrimination circuit 7.
Instead of a digital signal, a unique continuous frequency (e.g. 2K
)lz, 3K! It is also possible to use a signal with a frequency that changes according to a certain rule as a data signal, such as a low frequency signal such as 1z, and the apparatus can be simplified, especially when the number of types of data is small.

In this way, unique data such as a password unique to the handset 2 can be identified, but there is no need to insert the handset 2 into a reader as in the past, which improves operability.
Since it is a non-contact type, there is no mechanical or magnetic damage. In addition, there is no need to have a built-in battery in the handset 2, making handling very convenient.

performance becomes stable. Furthermore, unlike magnetic cards, there is no risk of data being erased due to an accident or being read by an outsider, and new uses such as using the handset 2 by embedding it underground or inside a wall are also possible.

As a specific example, along with the underground objects, the date of burial,
The slave device 2, which records data such as product numbers, is buried in the ground together with the slave device 1, and the data can be read from the ground or wall surface at any time by the master device 1.

〔Effect of the invention〕

As explained above, according to the present invention, the master unit and the slave unit are provided with resonance circuits that excavate and resonate at the same frequency,
When the slave unit approaches the base unit, the slave unit receives high-frequency power from the base unit through electromagnetic inductive coupling, and this power is used as the operating power to transmit data from the slave unit to the base unit without contact. , has good operability and convenient handling,
There is an effect that there is no mechanical or magnetic damage, and since batteries are not required in the slave unit, maintenance and inspection are omitted, malfunctions are reduced, and performance is stabilized.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an electric circuit showing an embodiment of the present invention. 1...Base unit 2...Slave unit 3...Power supply circuit 4...High frequency power generation circuit 5...Base unit resonant circuit 6 ...Detection converter 7... Verification and discrimination circuit 8 ... Handset resonance circuit 9 ... Rectification stabilization circuit

Claims (1)

[Claims] In the remote data identification method, which identifies the unique data of a slave unit on the base unit when the slave unit approaches the base unit, the base unit includes a power supply circuit, a high-frequency power generation circuit that generates high-frequency power, and a certain frequency using the high-frequency power. The main unit is equipped with a resonant circuit that oscillates at the same frequency as the main unit, and the resonant circuit that resonates at the same frequency when electromagnetically coupled with the resonant circuit of the main unit, and this resonant circuit stabilizes the high-frequency power received from the main unit. The handset is equipped with a rectifying and stabilizing circuit that converts the DC power into DC power, and a data signal generation circuit that generates a data signal specific to the handset using the DC power, and the data signal is modulated by the resonant circuit of the handset. a detection demodulator that detects and demodulates the modulated signal generated in the resonant circuit of the base unit;
A remote data identification system, characterized in that the base device is provided with a verification/discrimination circuit that collates the demodulated signal to determine unique data of the slave device.