JPH0785331A - Device for access control with parallel antenna wire - Google Patents

Abstract

PURPOSE:To realize the reception superior in an SN ratio. CONSTITUTION:A first antenna wire 1 wound clockwise and a second antenna wire 20 wound counterclockwise are provided along a passage in a gate part through which a person 3 carrying a radio ID card 2 passes. The antenna wires 1 and 20 are electrically connected in parallel and the respective antenna wires 1 and 20 receive signals from the radio ID card and the like. Thus, external electromagnetic wave noise is removed, the feeble signal can be detected and the shift of an object can be detected with a high probability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an entrance / exit management device used for entrance / exit management in a specific area such as a factory or a construction site.

[0002]

2. Description of the Related Art Conventionally, radio waves have been used as a communication means, and a non-contact type radio wave ID card has been used as an individual object (person or product).
In a system for carrying in / out management of the object while being carried around, since a loop antenna or bar antenna is used, a radio wave ID card indicating the location of each object and each gate unit for detection are provided. If it is far from the installed antenna, S /
In some cases, the N ratio has deteriorated and the ID data cannot be detected or identified.

[0003]

SUMMARY OF THE INVENTION The present invention aims to overcome the above-mentioned drawbacks of the prior art, and provides an entrance / exit management device having a high-performance parallel antenna wire.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. Communication means is attached to an object, and an antenna circuit having an antenna wire is provided near a passage. In the entry / exit management device in which the gate is configured to transmit the ID data from the communication means to the antenna wire when the object passes through the gate, the first antenna wire that is wound clockwise, A second antenna filament, which is wound counterclockwise, is provided in parallel along the passage to electrically connect both antenna filaments, and the object is parallel to the first plane substantially determined by the antenna filaments. There is provided an entrance / exit management device (1) having a parallel antenna wire, which is characterized in that it moves along a passage in the following direction. In addition, in the above-mentioned entrance / exit management device (1), a third antenna wire which is a second plane which is substantially parallel to the first plane and which is wound in a clockwise direction on opposite surfaces sandwiching a passage is provided. A fourth antenna wire which is wound counterclockwise is further provided to electrically connect both antenna wires and also to the first antenna wire and the second antenna wire. The first plane and the second
There is provided an entrance / exit management device (2) having a parallel antenna wire, characterized in that an object passes between the two planes. Further, in the above-mentioned entrance / exit management device (2), a third device which is substantially perpendicular to both the first plane and the second plane.
A fifth antenna wire wound in a clockwise direction and a sixth antenna wire wound in a counterclockwise direction are provided on the plane of the above, and both antenna wires are electrically connected and the first antenna It is also electrically connected to the filament, the second antenna filament, the third antenna filament, and the fourth antenna filament, and is surrounded by three planes of the first plane, the second plane, and the third plane. Provided is a device (3) for entrance / exit management, which is provided with a parallel antenna wire, characterized in that an object passes through a space defined by the objects.

[0005]

In the present invention, the external electromagnetic wave noises are mutually canceled by the plurality of antenna filaments arranged in parallel on at least the passage on the substantially same plane, and the radio wave I
Provided is a detection unit having a good S / N ratio, which can detect a weak signal from a communication unit such as a D card. Further, by arranging a plurality of antenna filaments on each of two or three planes in contact with the passage, a higher level noise compensation function can be obtained.

[0006]

【Example】

(Embodiment 1) A detailed description will be given below according to an embodiment.
FIG. 1 is a perspective view showing the configuration of a certain gate portion according to the first embodiment. The gate portion is provided at a predetermined position so as to divide the section.

In FIG. 1, reference numerals 1 and 20 denote antenna strips provided in parallel with the gate portion, 1 denotes a first antenna strip that is wound clockwise, and 20 is a counterclockwise strip. It is the second antenna wire. Reference numeral 2 is a non-contact, non-power supply type radio wave ID card which operates by receiving energy supply from an external electromagnetic field. Also, the radio wave I equipped with a power source
It may be a D card.

When the person 3 passes through the gate portion provided in the passage, the first antenna wire 1 and the second antenna wire 20 which are provided in parallel on one side along the passage are provided. Traveling on the passage along a first plane substantially determined by

When the radio wave ID card 2 enters the effective range of these antenna groups, the radio wave ID card 2
Operates by receiving energy from the electromagnetic field generated by each antenna wire (the first antenna wire 1 or the second antenna wire 20), and converts the ID data stored in the radio wave ID card 2 into a radio wave. Let it be transported and send it to the antenna wire.

Then, when the transmission radio wave containing the ID data is received by the antenna wire and further demodulated and the ID data is confirmed by a host computer (not shown), the door 4 is opened.

The input / output terminals of the first antenna wire 1 and the second antenna wire 20 have gate transmitter / receiver 5 (not shown).
0, and further connected to a host system (host computer or the like) of the entry / exit management device. The ID data and the like sent from the radio wave ID card 2 and sent via the first antenna wire 1 or the second antenna wire 20 are registered in advance inside the host system (host computer). Collated with master data etc. Also,
The entry / exit management data, which changes every moment, is stored in the host system as real-time data.

The radio wave ID card 2 is not limited to a so-called ID card. The card format is convenient for people to carry. Usually a card with an effective loop area, which is semi-fixedly attached to a helmet or placed in a person's chest pocket. However, basically, it is sufficient if they are functionally equivalent, and it is mainly determined in relation to the frequency band used and the form of the antenna wire for receiving the ID data. Person 3
Is not limited to the case shown in FIG. 1 and may be a moving body such as an animal, a machine, a robot, etc., and the door 4, the passage blocking device or the flow changing device is provided at each gate portion as necessary.

In the embodiment, the frequency band of the used radio wave is a long wave band from 10 kHz to 150 kHz,
The frequency is not limited to this, and may be a medium wave band, a microwave band, or another frequency.

FIG. 2 is a schematic diagram showing the basic structure of the antenna wire provided in the gate portion used in this embodiment.
In FIG. 2, it is preferable that the connecting portions of the first antenna wire 1 and the second antenna wire 20 have opposite ends facing each other connected in parallel, and the first antenna wire 1 and the second antenna wire 20 are connected in parallel. It is preferable to electrically connect both ends of the wire 20 to a gate transceiver 50 (not shown) in consideration of reception characteristics, productivity, and the like.

In the present embodiment, the connecting portions of the first antenna wire 1 and the second antenna wire 20 may be connected in series with one ends facing each other in series.
It is also possible to use the other end of the second antenna wire 20 connected to the gate transmitter / receiver 50, and it is appropriately selected according to the operating frequency, environment and the like.

The first antenna wire 1 and the second antenna wire 20 are generally separated from each other so that their loops do not overlap with each other, but they may be overlapped with each other. Alternatively, they may be stored in the same case.

It is preferable that the number of turns of the first antenna wire 1, the number of turns of the second antenna wire 20, and the inner diameters of the windings are substantially equal. Note that the antenna loop is not limited to a circle as long as its effective shape is the same, and the current induced in the first antenna wire 1 due to external electromagnetic noise and the second antenna wire due to external electromagnetic noise. This is because the electric currents induced in the strips 20 cancel each other out.

Considering the S / N ratio, the distance L is 0.01 to ³ when the area of one antenna is 0.1 m ² .
A suitable range is 16 m (area ÷ L ² = 0.01 to 1000), and 0.1 to 1 m (area ÷ L ² = 0.1 to 0.1 m).
10) is more preferable, 0.125 to 0.5 m (area ÷
L ² = 0.4 to 6.4) is particularly preferable.

(Embodiment 2) In FIG. 3, a first antenna wire 1A and a second antenna wire 20 are provided on opposite surfaces sandwiching a passage.
Example 2 in which A, and the third antenna filament 1B and the fourth antenna filament 20B are arranged is shown. The person 3 has a second plane substantially determined by the third antenna filament 1B and the fourth antenna filament 20B, and a first plane substantially determined by the first antenna filament 1A and the second antenna filament 20A. Move between and pass.

With this arrangement,
A communication environment with an improved S / N ratio can be obtained. Normally, the winding directions of the opposing antenna filaments are determined so as to be in a mirror image relationship with the passage in between, but the non-mirror image relationship is set according to the situation of the gate portion. That is, the winding direction is adjusted for each gate unit, the first antenna filament is clockwise, the second antenna filament is counterclockwise, and the third antenna filament is clockwise, and the fourth antenna is clockwise. The lines may be counterclockwise.

(Embodiment 3) In addition to the antenna wire in Example 2, a fifth antenna wire and a sixth antenna wire were arranged on the upper surface of the passage. Then, the object moves and passes through the plane determined by the antennas arranged in parallel. With this arrangement, a communication environment with an improved S / N ratio can be obtained.

Further, the fifth antenna wire and the sixth antenna wire can be arranged on the floor surface of the passage. Further, the winding direction of each plane can be adjusted and installed for each gate.

However, it is basically advantageous in terms of manufacturing and maintenance to use an antenna wire having the same shape for each gate. FIG. 4 shows the configuration of the second embodiment as a block diagram. In FIG. 4, two gate parts are shown. The winding direction and the number of windings can be appropriately adjusted for each gate portion. In the present invention, the antenna filaments arranged in parallel in each plane have substantially the same specifications except for the winding direction, and do not essentially fulfill one auxiliary function.

[0024]

According to the prior art, even in the oppositely wound antenna system provided opposite to each other, the voltages due to the external electromagnetic wave noise induced in the respective antenna filaments act in the directions canceling each other. It has a specific noise output voltage because it cannot be canceled out completely due to the difference in radio wave intensity and the difference in external noise radio field strength depending on the installation position.

Therefore, in the present invention, a plurality of antenna wires having the same loop size and the same number of windings of the antenna wires are provided, and a plurality of antenna wires are provided so that the noise output voltages are equal to each other. The antenna wires are placed close to each other in parallel to reduce the noise output voltage of external electromagnetic noise. As a result, the noise level at the gate transceiver is lowered and the signal from the radio wave ID card is not buried in the noise, so it is possible to detect and identify the ID signal stably with high probability even in an environment with a lot of external electromagnetic noise. Since the reliable sensing can be ensured, the quick passage control of the object can be achieved.

Therefore, even in an environment such as a construction site or in a factory where a lot of external noise radio waves are present, an individual can be identified by a communication device such as a non-contact type ID card having a simple device configuration. Furthermore, since the detection and identification capabilities are high, there is no need for a structure for limiting the passing speed, the position, the direction, etc., so that an effect that smooth passage is possible is recognized.

[Brief description of drawings]

FIG. 1 is a perspective view of a gate unit according to a first embodiment.

FIG. 2 is a schematic diagram showing a basic configuration of an antenna wire according to the first embodiment.

FIG. 3 is a perspective view of a gate portion according to the second embodiment.

FIG. 4 is a block diagram showing a partial configuration of a second embodiment.

[Explanation of symbols]

 1: first antenna wire 20: second antenna wire 2: radio wave ID card 3: person 4: door

Claims (3)

[Claims] 1. A communication means is attached to an object, an antenna circuit having an antenna wire is provided near a passage to form a gate, and when the object passes through the gate, the communication means moves the antenna wire. In an entrance / exit management device for transmitting ID data to a device, a first antenna wire wound in a clockwise direction and a second antenna wire wound in a counterclockwise direction are provided in parallel along a passage. , An entry / exit with parallel antenna strips, characterized in that both antenna strips are electrically connected and an object moves in a path along a direction parallel to the first plane substantially determined by both antenna strips. Management device. 2. The entrance / exit management device according to claim 1, wherein
A second plane that is substantially parallel to the plane of the above, and has a third antenna wire wound clockwise and a fourth antenna wire wound counterclockwise on opposite surfaces sandwiching the passage. Further provided, electrically connecting both antenna wires, and also electrically connecting the first antenna wire and the second antenna wire,
An entrance / exit management device having a parallel antenna wire, wherein an object passes between both of the first and second planes. 3. The entrance / exit management device according to claim 2, wherein a fifth antenna wire wound clockwise is provided on a third plane substantially perpendicular to both the first plane and the second plane. And a sixth antenna wire wound counterclockwise are provided to electrically connect both antenna wires, and the first antenna wire, the second antenna wire, and the third antenna wire. A parallel arrangement in which an object passes through a space surrounded by three planes of a first plane, a second plane, and a third plane, which are electrically connected to a strip and a fourth antenna strip. A device for access control with an antenna wire.