JPS59130978A - Electronic key apparatus - 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 (Description of Technical Field) The present invention relates to a key device for a door or the like that uses an electronic circuit, and more particularly to an electronic key device that transmits and receives key information through magnetic field coupling.

(Description of Prior Art) Conventionally, the key to locking and unlocking car doors, etc.
Locking, unlocking, and opening were performed using mechanical shape alignment. These conventional key devices use mechanical alignment, so if the size is set to one level, it is not possible to make keys for many $J fields, and there will be many identical keys. . For example, conventional keys for passenger cars, etc., only need to be inserted a few times and have not been sufficiently effective as keys to prevent car theft.

(Objective of the Invention) The object of the present invention is to solve these drawbacks and to utilize an electronic circuit to make keys for a large number of applications.
Also, without putting the key in the keyhole, just bring the key close and it will lock due to magnetic field coupling.

The key is to use the key device that can be unlocked.The details will be explained below.

(Configuration of the Invention) A first configuration of the present invention includes means for generating a code assigned to a key device, a modulating unit for converting the code into a signal form that is easy to transmit by magnetic field coupling, and The second configuration is characterized in that it has a first magnetic field coupling coil that sends out an output signal as a magnetic field change, and the second configuration further includes a second coupling coil that detects the sent out magnetic field change; The output of the second coupling coil [with demodulation means for converting the signal inversely to the above conversion, and a code assigned to itself by the code string obtained by the demodulation means and a code assigned to the key device in advance; It is an electronic key device that operates the lock machine (1q) and has verification means to determine that the lock is present.

(Description of Embodiment) FIG. 1 is a block diagram showing an embodiment of the present invention. 1st
In the figure, 1 is a key device that is carried by hand, and 2 is a code generator, which generates a code assigned to the key device. Reference numeral 3 denotes a modulation section which converts the code generated from the code generation section 2 into a signal form that is easy to transmit by magnetic resonance coupling. Reference numeral 4 denotes a first output coil, which transmits the output signal of the modulation section 3 as a magnetic change. 5 is a clock r source, and the code generator 2 generates a code string based on this clock signal. 6
is the magnetic field sent out from the first coupling coil 4 of the key device.

10 is a lock part of the car, and 1 is a second packing coil, which detects changes in the magnetic field 6. 12 is a receiver amplifier,
Reference numeral 13 denotes a demodulation section, which performs a conversion opposite to that of the modulation section 3. Reference numeral 14 denotes a verification unit, which determines that the code is the code assigned to the own key device based on the code 1 obtained by the demodulation unit 13 and the code assigned to the key device in advance. . 15 is a lock, an opening, a signal generating circuit, 16 is an electromagnetic coil, 17 is a lock bar, 18 is a door, 19 is a wall with a groove cut into it, a pillar, etc., and 20 is assigned to a key device in advance. This is a code generator that outputs one collated word.

FIG. 2 shows an example of the frame structure of a code string generated from the code generator 2. In FIG.

In the 21st series 1, the 71/-m configuration is N at time TI.
, a synchronization bit consisting of bits and N2 at time T2
Key information consisting of bits Consists of bits. The key information bits may include error detection bits and error correction bits. Manokoko's frame may be generated by consolidating TI+T2 as one cycle, or ・9 key-
It may be generated in a similar manner.

The modulator 3 in FIG. 1 receives the code string from the code generator 2, performs two modulations, and outputs a modulated signal to the magnetic field coupling coil 4.

The modulation method in the modulator 3 is FSK (Freque
cyShift Keying) modulation method or PSK (Phase Shift Keying) modulation method 15 may be considered, but any of them may be used.

When a modulation signal is applied to the first coupling coil 4, a current flows through the coil and a magnetic field 6 is generated. The key device R has the function of transmitting a code string by changing the magnetic field.

The second magnetic field coupling coil 1
), when the magnetic field generated at the key device 6-7) is polymerized, a current flows through the second coupling coil 1;
h. This current is amplified by a high frequency 12 and the band of the t signal is limited, and the received signal is passed to the demodulator 13.

The demodulation unit 13 uses a demodulation method according to the modulation method in the key device 1 and obtains a code 1 which is equivalent to the code generated inside the key device 1. The output signal of this demodulation section 13 is applied to a code matching section 14. On the other hand, a verification signal assigned in advance to the key device from the code generator 20 is added to the verification section 14, and both signals are compared in the verification section 14, and the comparison result is locked and unlocked signal generation circuit 15 If the comparison results match, the electromagnetic coil 16 is
"1i style, insert and remove the lock rod 17,
Perform unlock.

Regarding the frame structure of the code sequence shown in Figure 2, the same gate bit is information for recognizing the time reference indicating the start of the code, and the key information bit is used for locking one code string and locking another code string. For unlocking.

In this case, the code generator 2 included in the key device 1 outputs the two code strings separately, and changes ggl:
'rJI,? Connect by selecting 4 ports using the switch.

Alternatively, make it smaller/avoid low reliability by using coils and swivels/do not use the ζ selection switch, and use the modulation section, the first coupling coil, and the two coupling coils for locking and unlocking.
Systems may be provided separately.

The code generator 2o in the locking part 1θ locks whether its own key device is in the locked state or in the unlocked state, and a voltage is induced in the second coupling coil 11 by the unlock signal generating circuits 1 and 5. Upon receiving the information that 11iB has been received, the amplifier 12 receives the information and generates a locking code or an unlocking code based on the logic of both. For example, when information that a voltage is induced from the 'g device 12 in the receiver 11 is triggered in the unlocked state, a locking code is output, and if the code in the key device 1 is a locking code, the verification code 51411
J, Lock Unlock signal generation port 1, 15 to 1". If the code from the key device 1 is an unlock code, the keys do not match and the device remains in the unlocked state. The same applies to the 1μ case where the lock portion 10 is in the locked state.

Well, the type of key matches the code string.

If the key tW information is prepared with FKN bits/bits, then the key :lfrj can be of 2N-+ (however, 0'yct7)r-ff, and if a Kuni-specific dog code is assigned). For example, if N = 2-Q, there are 524,288 types of keys, and 1. It's almost impossible to relax.

As explained above, in the first embodiment, a code corresponding to the key information is transmitted by electromagnetic coupling, and when it is recognized that the code matches the code assigned to the key, the key is locked/unlocked. By increasing the code length, you can use more types of keys, and you will no longer be able to open or close the key with someone else's key! It is P11. In addition, since the transmission of the government code sequence, which is a non-nogi information, is carried out by magnetic field coupling, there is no need to insert a key into the keyhole when opening or closing the door. In the first embodiment, if someone else cancels the
ll, but it is not entirely possible. The method can be released by generating and transmitting patterns of all combinations of the code number 1 of the key code number 1.

Naturally, to avoid such abuse, the code speed and f!
It is necessary to adjust the J length appropriately. For example, set J frame length (T+-1-T2') to 100 milliseconds,
Assuming tN-20, the time required to send out all and Kuno is 1. 100XIO-3X2””’; 1.049X10” seconds #
It will be 29.1 hours.

If 7tL is not enough for malicious purposes, N can be increased further. However, if the key is lost, it is almost impossible to open the door with someone else's key, and as a safety measure in case of loss, there is usually a master key. In the second embodiment, an electronic key device in which a master key can exist will be described. Figure 3 shows an example of the freight configuration with code l.
It consists of a key information bit T2 and a master key bit T3.

The normally used keys frj, T1 and T2 information are sent out, and T3 is assumed to be a dummy code string. Also, from the master key, T1 and T3 are taken out, and T2
is a dummy code string. The code matching section has a function of directly inputting both the code strings of T2 and T3 with 1/-1. If the code matching result of one of the eight matches, the lock can be released.For T3, if the same code string is set for all types of key device folding, the master key will be Naturally, the master key code string T3 can be
If you prepare a J tumor, you can also use thousands of master keys.

(Effect of the invention) According to the first configuration of the invention, a signal of a change in magnetic field can be generated with a simple device, and a signal of a change in the magnetic field can be caused to flow through a coil.
Since it relies on current, only a small amount of current is required, and compared to signal generation using light, the amount of power consumed can be significantly reduced by one.

According to a second aspect of the invention, a code is transmitted to one locking device by means of a magnetic field and coupling, and the code is determined to match the assigned reference code, and locking or unlocking is performed. This has the advantage that by increasing the number of code bits, the number of key combinations can be greatly increased. By providing a master key code string in the frame, an electronic key device in which a master key exists can also be created. However, since locking or locking is performed by transmitting a code string by magnetic field coupling, there is no need to insert a key into a keyhole, and there is an advantage that the key device can be brought close to the key. Since it is magnetically coupled, signal transmission will not be affected in any way even in cold regions, even if the magnetic field coupling part freezes.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG.
FIG. 3 is an example of a frame structure of a transmission code. 1. Key device, 2. Code generator, 3. Modulation) 11S
, 4... first coupling coil, 5... clock source, 11
...Second coupling coil, 12...Reception amplification section, 13.
・Demodulation section, 14 ・11 coupling section, 15...Lock, unlock signal generation circuit, 16 ・Electromagnetic coil, 17 ・Lock connection 0 Patent applicant Oki Electric Industry Co., Ltd.

Claims (2)

[Claims] (1) A means for generating a code assigned to a key device, a modulating means for converting the code into a signal form that is easy to transmit by magnetic field coupling, and a magnetic field coupling for transmitting the output signal of the modulating means as a magnetic field change. An electronic key device characterized by having a coil. (2) A means for generating a code assigned to the key device, a modulator stage for converting the code into a signal form that is easy to transmit by magnetic field coupling, and transmitting an output signal of the modulating means as a magnetic field change. a first magnetic field coupling coil; a second coupling coil for detecting the change in the transmitted magnetic field;
demodulating means for converting the output signal of the coupled coil in the opposite manner to the above-mentioned conversion, and a code assigned to the key device by a code string obtained by the demodulating means and a code previously assigned to the key device. An electronic key device that operates a locking mechanism and has a verification means for determining.