JPH09284235A - Portable read gate for mobile id code - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable mobile ID code read gate suppressing noise production. SOLUTION: A path 1 with respect to a mobile body through which an ID code radio wave is sent in the case of receiving a read radio wave is provided to a portable frame 2. An antenna 3 is projected from the frame 2 to the path 1. A conductive shield layer 4 is removably fitted to a part at the outer circumference of the frame 2 surrounding the antenna 3. The antenna 3 sends the read radio wave and receives the ID code radio wave from the mobile body in the path 1. The portable frame 2 may be composed of a rod member 6 coupled separatally and a metallic foil and/or a wire net clamping the conductive shield layer 4 between the couple of protection plates 9 may be adopted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable reading gate for mobile ID codes, and more particularly, it is a portable type for reliably reading ID codes by shielding noise in factories, construction / civil engineering works, etc. where electromagnetic noise is high. Regarding the gate.

[0002]

2. Description of the Related Art In order to save labor, it has been proposed to manage the movement of a moving body by radio waves. For example, in the controlled area 30 shown in FIG. 3 or the like, the transmission card 34 is attached to the vehicle 31 which is a moving body, and the transmission card 34 is transmitted in response to the arrival of the read radio wave transmitted from the transmission device 35 through the antenna of the reading means 36. An ID code radio wave is emitted from the vehicle, the ID code is read by the reading means 36, and each vehicle 31 is individually identified by collating the previously registered ID code with the ID code thus read. In addition, when the moving body is a person 32, for example, a calling card is attached to a helmet 33 that is obligatory to wear.
The ID code of the person 32 is read and identified in the same manner as in the case of the vehicle 31 by mounting the transmission device 34 and the reading means 36 with an antenna provided at a wall position slightly higher than the height of the transmission device 35 and the person 32.

[0003]

However, in an ID code reading / identifying device that uses radio waves, if the level of electromagnetic noise at the place of use is high, the reception of the ID code radio waves is impaired, resulting in erroneous recognition. There is a risk. This electromagnetic noise includes radio waves from vehicles running in the vicinity, broadcast radio waves, radio waves generated by electronic devices such as computers in the vicinity,
Equipment used at nearby factories and construction sites, such as radio waves generated from inverters.

When it is installed at a construction site, etc.,
It is necessary to move the management area 30 according to the progress of construction and other changes in the situation, and therefore the read signal transmission device 35 and the antenna read means 36 are relocated. Since the device 35 and the means 36 are attached to the wall surface of the facility, there is a problem that the relocation work is complicated and time-consuming.

Therefore, an object of the present invention is to provide a portable mobile object ID code reading gate in which the influence of electromagnetic noise is suppressed.

[0006]

With reference to the embodiment shown in FIGS. 1B1 and 1B2, a portable reading gate for a mobile ID code of the present invention sends an ID code radio wave when receiving a read radio wave. A removable frame body 2 having a passage 1 for a moving body (31, 32 in FIG. 3), an antenna 3 protruding from the frame body 2 toward the passage 1, and a detachable portion surrounding the antenna 3 on the outer periphery of the frame body 2 The radio wave is read by the antenna 3 and the ID code radio wave from the moving body in the passage 1 is received.

Preferably, the portable frame body 2 is constituted by a rod-shaped member 6 which is detachably coupled, and the conductive shield layer 4 is a metal foil and / or a metal net.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 having a passage 1 (60 cm long, 90 cm wide, 190 cm high) that is large enough for only one person to pass through at a time.
A portable reading gate having the structures (B1) and (B2) was prototyped using the portable frame body 2 in which the steel rod member 6 was assembled. However, as the conductive shielding layer 4, a copper foil metal layer 8 is sandwiched between a plurality of pairs of acrylic plate protective plates 9 rotatably coupled by a hinge 11 having a structure shown in FIG. 1 (A). A flexible electromagnetic shielding sheet was used. Furthermore, this electromagnetic shielding sheet was grounded. Transmission device 35 of FIG. 3 (Tyris, model number RI-T
RP-W9FF) and the reading radio wave sent by the reading means 36 (antenna) and the frequency of the supplementary ID code radio wave are assumed to be 125 kHz, and the dark electric field strength in which noise from the inverter exists (read radio wave is not sent and The shielding effect and the ID code reading distance were measured in a room where the electric field strength when the ID code radio wave did not arrive) was 100 dBμV / m. The results are shown in Table 1. Here, the "ID code reading distance" refers to the farthest antenna 3 and the ID transmission card 34 (FIG. 3) from which the ID code signal can be read by a reading device such as the transmission device 35 and the reading means 36 of FIG. Is the distance between.

As is clear from Table 1, the conductive shield layer 4
With the read gate of the present invention equipped with the above, a radio noise shielding effect of 10 dB was obtained in the frequency band used for reading the ID code, and thereby the ID code reading distance could be more than doubled. Moreover, this reading gate is a portable type that is easy to disassemble and assemble and can be easily relocated.

[0010]

[Table 1] Table 1 ID code reading distance and measurement result of dark electric field intensity in passage Item ID reading distance 125kHz Dark electric field strength (cm) (dBμV / m) Before electromagnetic shield layer installation 20 100 After electromagnetic shield layer installation 50 90

Thus, the object of the present invention, "to provide a portable mobile object ID code reading gate in which the influence of noise is suppressed" can be achieved.

[0012]

EXAMPLE In FIG. 1A, in order to prevent the passage of radio waves at the hinge 11 of the electromagnetic shielding sheet, a strip-shaped connecting conductor 10 is provided over the entire length of the hinge 11, and this conductor 10 is connected to the metal layer 8 Connected to. The metal layer 8 is not limited to a copper foil, but may be an iron thin plate, a metal, or a net of various conductive materials.

1 (C1), (C2) and (C3) show a portable frame 2
When the antenna holding member 13 made of metal is provided on the antenna 3 and the antenna 3 is mounted on the same plane as the antenna holding member 13, when the antenna 3 is retracted from the passage 1 and attached to the antenna holding member 13, and when the antenna 3 is projected to the passage 1. The case where it is attached to the antenna holding member 13 is shown. As a result of actually measuring the change in the ID code reading distance in Table 1 due to the difference in the mounting of the antennas, in the case of FIG. 1 (C3) in which the antenna 3 is projected into the passage 1, as shown in FIGS. 1 (C1) and (C2). The ID code reading distance could be extended by about 20 cm compared with the case where the antenna holding member 13 is mounted on the same plane and the case where the antenna holding member 13 is mounted by retracting from the passage 1. The mobile unit ID of the present invention is based on the measurement result.
In the portable reading gate of the code, the antenna 3 is attached so as to project toward the passage 1.

FIG. 2 (A) shows that the metal fittings of the hinge 11 are attached to one outer surface of the pair of protective plates 9 in order to strengthen the electromagnetic shield at the portion of the hinge 11 in the electromagnetic shielding sheet of FIG. 1 (A). , A structure in which a flexible conductive tape 12 is attached over the entire length of the hinge 11 so as to cover the opposite end edge of the adjacent protective plate 9 on the outer surface on the opposite side. FIG. 2B shows an embodiment in which the flexible conductive tape 12 on the outer surface of the protection plate 9 in FIG. 2A is interposed between the protective material 9 having the metal fitting of the hinge 11 and the metal layer 8. Indicates.

[0015]

As described above, the mobile unit ID of the present invention
The portable reading gate of the code uses the portable frame body and the detachable conductive shield layer, and therefore has the following remarkable effects.

(B) The electromagnetic noise level at the ID code signal reading position can be reduced, and the ID card reading distance can be improved to more than twice that of the conventional one. (B) By reducing the electromagnetic noise level, it is possible to prevent ID code reading errors. (C) Relocation is easy, and it is possible to easily move to the mobile unit management area. (D) Cover the existing ID code reading equipment with the electromagnetic shielding sheet of the present invention to reduce the electromagnetic noise level inside the equipment.
The accuracy of D code reading can be improved. (E) It can be applied to not only personnel but also vehicle ID code reading.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of one embodiment of the present invention.

FIG. 2 is a sectional view of an electromagnetic shielding sheet.

FIG. 3 is an explanatory diagram of a mobile unit management area based on a mobile unit ID code.

[Explanation of symbols]

 1 Passage 2 Transportable Frame 3 Antenna 4 Conductive Shielding Layer 6 Rod-like Member 7 Shielding Cover 8 Metal Layer 9 Protective Plate 10 Band-Shaped Connection Conductor 11 Hinge 12 Flexible Conductive Tape 13 Antenna Holding Member 30 Control Area 31 Vehicle 32 People 33 Helmet 34 Calling Card 35 Transmission Device 36 Reading Means.

Claims (7)

[Claims] 1. A portable frame body having a passage for a moving body that transmits an ID code radio wave when receiving a reading radio wave, an antenna protruding from the frame body toward the passage, and a detachable part attached to a portion surrounding the antenna on the outer periphery of the frame body. A mobile unit I provided with a flexible conductive shield layer, which transmits a reading radio wave by the antenna and receives an ID code radio wave from the mobile unit in the passage.
Portable reading gate for D code. 2. The portable reading gate for a movable body ID code according to claim 1, wherein the portable frame is composed of a rod-shaped member that is detachably connected. 3. A portable read gate for a mobile object ID code according to claim 1, wherein the conductive shield layer is a metal foil and / or a metal mesh. 4. The portable read gate for a mobile body ID code according to claim 3, wherein the metal foil and / or the metal net is sandwiched between a pair of protective plates. 5. The portable type of mobile object ID code according to claim 4, wherein said metal foil and / or metal net is sandwiched between a plurality of pairs of protective plates rotatably connected to each other by a hinge. Read gate. 6. A bendable electromagnetic shielding sheet for an ID code reading gate, comprising a metal foil and / or a metal net sandwiched between a plurality of pairs of protective plates rotatably coupled to each other by a hinge. 7. The shielding sheet according to claim 6, wherein the portion of the adjacent edges of the adjacent protective plates joined by the respective hinges over the entire length of the hinge is flexible so as to come into contact with the metal foil and / or the metal net. Flexible electromagnetic shielding sheet for ID code reading gates, provided with a conductive tape.