JPH0575864U - Control device for transmission / reception coil in reader device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a device capable of reliably performing mutual communication between the ID card and the reader device regardless of the angle of the ID card. In a device for mutually transmitting information between a transmission / reception coil 50 of a reader device 11 and a transmission / reception coil 60 of an ID card 10 using an induction electromagnetic field as a medium, the reader device 11 is provided with a magnetic field direction of the transmission / reception coil 50. This is a control device for a transmission / reception coil, which is provided with means for changing the motor 77. Even if the ID card 10 is in a state orthogonal to the magnetic flux direction of the transmission / reception coil 50 of the reader device 11, the direction of the magnetic flux from the transmission / reception coil 50 changes momentarily, so that the orthogonal state changes and crosses gradually. Since the number of magnetic fluxes increases, it becomes possible for the transmission / reception coil 60 to detect a signal from the transmission / reception coil 50.
Is reliably detected. When the ID card 10 cannot be detected while the transmission / reception coil 50 is rotating in the normal direction, the transmission / reception coil 50 is rotated in the reverse direction when the inverted position is reached. And
After that, the normal rotation and the reverse rotation are repeated to search the ID card 10.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention makes it possible to reliably transmit and receive mutual signals in a device that transmits mutual information using an induction electromagnetic field between a mobile station (ID card) and a fixed station (reader device) as a medium. The present invention relates to a control device for transmitting and receiving coils in the reader device.

[0002]

[Prior Art]

 For example, in order to allow only a specific person to enter and exit a specific entrance / exit, conventionally, an ID card as a mobile station with an identification code is issued and the ID card is installed at the entrance / exit or on the side of the entrance / exit. I inserted it into the card reader and judged whether it was an identification code given only to those who could enter the room, and if it matched, the door was opened. Similarly, at automatic ticket gates at stations, when a commuter pass is inserted into an automatic ticket gate, it is determined whether the stored identification code is normal, and if normal, the door or arm is opened.

[0003]

[Problems to be solved by the device]

 However, every time I go in and out, I have to take out the ID card from my pocket or bag and insert it into the card reader. When the door opens, I have to quickly remove the ID card from the card reader and put it back in my pocket or bag again. However, there was a problem that the operation was troublesome. It is conceivable that a wireless signal is transmitted from the ID card, and when it approaches the entrance, it is automatically sensed to determine the content of the ID code of the ID card. In this case, in order to communicate the ID information between the ID card and the reader device by using the induction electromagnetic field as a medium, as shown in FIG. 6, the transmission / reception coil 60 incorporated in the ID card and the reader device are incorporated. If the direction of the mutual magnetic field is orthogonal to or close to that of the transmitting / receiving coil 50, the number of magnetic flux is extremely reduced and there is a problem that mutual communication becomes difficult. Therefore, it is desired that the ID card can communicate reliably regardless of the angle of the ID card.

It is an object of the present invention to provide a device that ensures reliable communication between the ID card and the reader device regardless of the angle of the ID card. is there.

[0005]

[Means for Solving the Problems]

 The present invention relates to a device for mutually transmitting information between a transmission / reception coil 50 of a reader device 11 and a transmission / reception coil 60 of an ID card 10 by using an induction electromagnetic field as a medium. Is a control device for the transmission / reception coil in the reader device, which comprises means for changing the direction of the magnetic field of the transmission / reception coil by the motor 77.

[0006]

[Action]

 Even if the ID card 10 is in a state orthogonal to the magnetic flux direction of the transmission / reception coil 50 of the reader device 11, since the magnetic flux direction from the transmission / reception coil 50 changes every moment, the orthogonal state changes and the number of magnetic fluxes that intersect gradually is changed. It can be seen that the electromagnetic field from the transmission / reception coil 50 is induced in the coil of the tuning circuit 61 and the ID card 10 enters the reception area. When a predetermined electromagnetic field is not induced in the ID card 10 when the transmission / reception coil 50 is normally rotated, when the reversal position is reached, the movement of the transmission / reception coil 50 is reversed and the direction is changed. Then, the normal rotation and the reverse rotation are repeated thereafter, and the ID card 10 is similarly searched.

[0007]

【Example】

 Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 4 is an overall block diagram showing the relationship between the reader device 11 and the ID card 10 as a mobile station, and a controlled device, for example, a door 12 that automatically opens and closes will be described as an example. ..

The reader device 11 includes an oscillation circuit 55 that oscillates at a predetermined frequency at regular time intervals, a transmission / reception coil 50 that forms an electromagnetic field in a reception area, a tuning circuit 51, an amplification circuit 52 that amplifies a voltage, and an input signal waveform. A waveform shaping circuit 53 for shaping the data, a microcomputer 54 for storing and identifying data, controlling the motor 77, and the like, and a ROM 74 and a RAM 75 coupled to the microcomputer 54. The microcomputer 54 includes data in the reception area. An area position detection circuit 82 for determining whether or not it is, a control circuit 76 for controlling the motor by the output of the area position detection circuit 82, a data fetching circuit 72, and a registration circuit 73 for determining whether or not it is registered. .. The reader device 11 includes means for changing the magnetic field direction of the transmission / reception coil 50, that is, a motor 77 on a pedestal 81 and an appropriate speed reducer (not shown) as shown in FIGS. 1 and 2. ), The transmission / reception coil 50 is swingably attached via a rotary shaft 78, an arm 79, and a rotary shaft 80, and reciprocates within a fixed range from line a to line b.

The ID card 10 includes a coil and a capacitor, and has a resonance circuit 60 that resonates with an electromagnetic field from the reader device 11, a clock extraction circuit 61 that extracts a specific clock signal from the resonated signal, and an extracted signal. A first frequency dividing circuit 65 which divides the frequency by 64 and outputs a clock read signal (cycle t), and a second frequency dividing circuit which further divides the output of the first frequency dividing circuit 65 by 128 and outputs a reset signal. The frequency division circuit 66, an identification code generation circuit 67 for outputting its own identification code data in response to the clock read signal of the first frequency division circuit 65, a switch element, a capacitor and the like. It is composed of a modulation circuit 69 for performing AM (amplitude modulation) on the frequencies at both ends of.

The operation of the above configuration will be described with reference to the flowchart of FIG. (1) The start signal is output from the control circuit 76 of the microcomputer 54, and the motor 77 rotates in the normal direction. With this motor 77, the transmission / reception coil 50 starts turning in the positive direction from the a line side in FIG. 1 toward the b line. (2) At the same time, when the reader device 11 outputs a high-frequency signal from the oscillation circuit 55, the induction electromagnetic field is repeatedly transmitted from the transmission / reception coil 50 at regular intervals.

(3) When the ID card 10 enters the signal receivable area of the reader device 11, the coil 60 of the ID card 10 is set to the transmission / reception coil 50 of the reader device 11 as shown in 10a of FIG. When it is parallel to the magnetic flux direction, it surely resonates. At first, even if the coil 60 is in the orthogonal state as shown by 10b in FIG. 1, the magnetic flux direction changes every moment due to the vibration of the transmission / reception coil 50. Therefore, the orthogonal state changes, and the number of magnetic fluxes that cross gradually increases. Then, the resonance circuit 60 including the coil and the capacitor surely resonates with the electromagnetic field from the transmission / reception coil 50. In the ID card 10, the resonance signal is frequency-divided by the first frequency dividing circuit 65 into 64, and the clock read signal of the cycle t is output. The frequency-divided 64 signal is sent to the second frequency dividing circuit 66. The frequency is divided by 128 and output as a reset signal.

The clock read signal of the first frequency dividing circuit 65 is sent to the identification code generating circuit 67 via the inverter to generate unique identification code data. When the clock read signal of the first frequency dividing circuit 65 outputs 128 clocks, a reset signal is output from the second frequency dividing circuit 66 and the operation returns to the beginning. The frequency of both ends of the coil 50 of the fixed station 11 is AM-modulated by the modulation circuit 69 by the identification code data from the identification code generation circuit 67.

(4) The frequency of the transmission / reception coil 50 of the reader device 11 is modulated by the identification code signal of the ID card 10, envelope detection demodulation is performed by the tuning circuit 51, voltage amplification is performed by the amplification circuit 52, and waveform shaping is performed. The waveform is shaped by the circuit 53 and the digital signal is input to the microcomputer 54. At this time, irrespective of whether the ID card 10 is legitimate or not, even if a card equipped with a coil or other object approaches, the voltage across the transmission / reception coil 50 of the fixed station 11 changes. If the input level of the microcomputer 54 to the area position detection circuit 82 is equal to or higher than the set value, is there an ID card in the detection area? Is YES, the control circuit 76 stops the motor 77. Next, it is determined whether the ID card 10 is authentic. That is, the data captured by the data capturing circuit 72 is input to the RAM 75. It is determined whether or not the identification code input by the discrimination circuit 73 is registered in the RAM 75.

(5) If registered, the reader device number of the reader device 11 is added to the identification code, and a signal is output from the microcomputer 54 to the reader device centralized management circuit 40. The data input to the reader device centralized management circuit 40 is converted into predetermined data and output to the control circuit 41. The control signal from the control circuit 41 controls the opening of the door 12 as the controlled machine, and when the person carrying the ID card 10 passes through, the door 12 as the controlled machine is closed.

(6) When the ID card 10 cannot be detected when the transmission / reception coil 50 is rotating in the normal direction from the a line to the b line, when the inversion position (b line) is reached, the transmission / reception coil 50 reversely rotates. To do. After that, the normal rotation and the reverse rotation are repeated, and the ID card 10 is searched in the same manner as described above.

In the above embodiment, the means for changing the magnetic field direction of the transmitting / receiving coil 50 is composed of the motor 77, and one transmitting / receiving coil 50 is oscillated by the motor 77. However, the present invention is not limited to this embodiment, and as shown in FIG. 5, two or more transmission / reception coils 50a and 50b are arranged at an appropriate angle φ, such as 90 degrees. By the means for changing the magnetic field direction of the transmission / reception coil 50 composed of 54, the two transmission / reception coils 50a and 50b are alternately operated so that the ID card 10 is recognized when at least one of them is detected. May be.

[0017]

[Effect of the device]

 According to the present invention, since the reader device 11 is provided with means for changing the magnetic field direction of the transmission / reception coil 50, the transmission / reception coil 60 built in the ID card and the transmission / reception coil built in the reader device are provided. Even if the directions of the magnetic fields of 50 and 50 are orthogonal or close to each other, the number of magnetic fluxes immediately increases. Therefore, it is possible to reliably transmit and communicate information regardless of the angle of the ID card.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a control device of a transmission / reception coil in a reader device according to the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a flowchart.

FIG. 4 is a block diagram showing an embodiment of a control device for transmitting and receiving coils in a reader device according to the present invention.

FIG. 5 is a plan view showing another embodiment of the present invention.

6 is an explanatory diagram of the induction electromagnetic field direction between the transmission / reception coil 50 of the reader device 11 and the transmission / reception coil 60 of the ID card 10. FIG.

[Explanation of symbols]

10 ... ID card as mobile station, 11 ... Reader device as fixed station, 12 ... Door as controlled device, 40 ... Centralized control circuit for reader device, 41 ... Control circuit, 50 ... Transmitting / receiving coil, 51 ... Tuning circuit, 52 ... Amplification circuit, 53 ... Waveform shaping circuit, 54 ... Microcomputer, 55 ... Oscillation circuit, 56 ... Modulation circuit, 60 ... Transmitting / receiving coil, 61 ... Tuning circuit, 65 ...
1st frequency divider circuit, 66 ... 2nd frequency divider circuit, 67 ... Identification code generation circuit, 69 ... Modulation circuit, 72 ... Data acquisition circuit, 73 ... Discrimination circuit, 74 ... ROM, 75 ... RAM,
76 ... Control circuit, 77 ... Motor, 78 ... Rotating shaft, 79 ...
Arm, 80 ... Rotation axis, 81 ... Pedestal, 82 ... Area position detection circuit.

Claims (3)

[Scope of utility model registration request] 1. A transmission / reception coil 50 and I of a reader device 11.
In the device for mutually transmitting information to and from the transmission / reception coil 60 of the D card 10 by using an induction electromagnetic field as a medium, the reader device 11 is provided with means for changing the magnetic field direction of the transmission / reception coil 50. A transmitter / receiver coil control device in a reader device. 2. A means for changing the magnetic field direction of the transmission / reception coil 50 is a transmission / reception coil 50 by a motor 77.
The control device for the transmission / reception coil in the reader device according to claim 1, which is configured to swing. 3. The reader device according to claim 1, wherein the means for changing the magnetic field direction of the transmission / reception coil 50 comprises a microcomputer 54 for arranging two or more transmission / reception coils 50 at a predetermined angle and sequentially switching them. Transmitter / receiver coil controller.