JP2002230507A - Data carrier system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system using a non-contact radio data carrier capable of sending and receiving all electric waves in an effective electric wave zone. SOLUTION: This data carrier system is provided with the non-contact radio data carrier 3 capable of sending and receiving predetermined electric waves with an antenna 2 arranged in a predetermined position, and it is characterized by that a electric wave absorber 4 is arranged in a predetermined position near the non-contact radio data carrier 3. For example, the wave absorber 4 is arranged in a rear side of the non-contact radio data carrier 3 with respect to the antenna 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data carrier system using a non-contact wireless data carrier.

[0002]

2. Description of the Related Art In recent years, a device called a non-contact wireless data carrier has been widely used.

[0003] The non-contact wireless data carrier holds data transmitted from the antenna in a storage device in the non-contact wireless data carrier, or stores predetermined data in the data carrier in accordance with the data transmitted from the antenna. It has a function of transmitting to an antenna.

[0004] As this kind of non-contact type wireless data carrier, a non-battery type and a battery type which operate using electric power supplied via an antenna are known.

[0005]

However, in such a conventional non-contact type wireless data carrier, there are positions where the radio wave from the antenna cannot be received or transmitted depending on the position of the data carrier.

In such a case, the interrogation radio wave cannot be received via the antenna in the battery type non-contact type wireless data carrier, and the antenna is not used in the battery type non-contact type radio data carrier. Power is not supplied via the power supply, and the power supply does not operate at all.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and a non-contact wireless communication system capable of transmitting and receiving in all spaces in a radio wave area effective for operation of a non-contact wireless data carrier. It is an object of the present invention to provide a system using a wireless data carrier.

[0008]

Means for Solving the Problems The inventors of the present invention have made intensive efforts to solve the above-mentioned problems, and as a result, have obtained the following knowledge on the cause of the inability to transmit and receive radio waves in a non-contact wireless data carrier. .

FIG. 12 is a diagram for explaining the cause of the inability to transmit and receive radio waves in a non-contact wireless data carrier. In general, a radio wave transmitted from an antenna directly reaches a non-contact wireless data carrier, and is reflected by a reflection surface P such as a metal plate to reach a non-contact wireless data carrier.

[0010] When the incident wave A from the antenna and the reflected wave B from the metal plate or the like are at positions different in phase by 180 degrees, the incident wave A and the reflected wave B interfere with each other, and as a result, the radio waves cancel each other. And transmission and reception become impossible.

A portion where such transmission and reception are impossible is located at a position where the absolute values of the amplitudes of the incident wave A and the reflected wave B are equal, that is, λ / 4 (λ represents a wavelength) from the reflecting surface P. First appear at the position. In this case, the reflected wave B
Means that the phase is advanced by λ / 2 before the light is reflected by the reflection surface P and reaches a position separated by λ / 4.

Further, it has been confirmed by the present inventors that a portion where transmission and reception are impossible appears at every position λ / 2 from the position λ / 4 from the reflection surface P.

[0013] The present invention has been made in view of such knowledge, and as described in claim 1, can transmit and receive a predetermined radio wave to and from an antenna (2) disposed at a predetermined position. In a data carrier system including a non-contact wireless data carrier (3), a radio wave absorber (4, 4) is provided at a predetermined position near the non-contact wireless data carrier (3).
a) is arranged.

According to the first aspect of the present invention, since the radio wave absorber (4) is disposed at a predetermined position near the non-contact wireless data carrier (3), the reflection surface (such as a metal plate or a wall) is provided. Unnecessary radio waves (7) arriving at (5, 6) are absorbed and the reflected waves (7R) from the reflecting surfaces (5, 6) are absorbed, so that a part where transmission and reception cannot be performed is prevented. it can.

According to a second aspect of the present invention, in the first aspect of the present invention, the radio wave absorber (4) is located behind the non-contact wireless data carrier (3) with respect to the antenna (2). It is characterized by being arranged on the side.

According to the second aspect of the present invention, when the non-contact wireless data carrier (3) is arranged at a position where the reflection surface (6) such as a wall exists on the rear side, the reflection surface (6) Unnecessary radio waves that arrive can be efficiently absorbed, and thereby the reflected wave (7R) can be efficiently absorbed.

According to a third aspect of the present invention, in the first aspect of the present invention, the radio wave absorber (4
a) is arranged on the side of the contactless wireless data carrier (3) with respect to the antenna (2).

According to the third aspect of the present invention, when the non-contact type wireless data carrier (3) is arranged at a portion where the reflection surface (5) such as a wall exists on the side, the reflection surface (5) Unnecessary radio waves reaching the object can be efficiently absorbed, and thereby the reflected wave (7R) can be efficiently absorbed.

According to a fourth aspect of the present invention, there is provided a data carrier system including a non-contact wireless data carrier (3) capable of transmitting and receiving a predetermined radio wave to and from an antenna (2) disposed at a predetermined position. Wherein the non-contact wireless data carrier (3) is integrally formed with a radio wave reflector (9) that reflects a predetermined radio wave at a predetermined distance.

According to the fourth aspect of the present invention, the position of the data carrier (3) is set to a position separated by λ / 4 from the radio wave reflector (9), and nλ / 2 (n is a natural number) from this position.
By setting it so that it does not match a distant position,
It is possible to prevent a portion where radio waves cannot be transmitted or received from being expressed.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the data carrier system according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a schematic configuration of the present embodiment. As shown in FIG. 1, a data carrier system 1 according to the present embodiment includes an antenna 2 that can transmit a predetermined radio wave, and a non-contact wireless data carrier that can transmit and receive a predetermined radio wave to and from the antenna 2. Hereinafter, referred to as “data carrier”). The data carrier 3 is arranged near wall surfaces (reflection surfaces) 5 and 6 made of, for example, metal.

In the case of the present embodiment, the radio wave absorber 4 is provided on the side of the data carrier 3 with respect to the antenna 2.
Is arranged.

The radio wave absorber 4 is formed to have a size larger than that of the data carrier 3 and is disposed at a position separated by a predetermined distance from a rear wall surface of the data carrier 3.

In the case of the present invention, as the material of the radio wave absorber 4, for example, foamed materials such as styrene foam, urethane foam, foamed polyethylene, etc., filled with carbon, a ferrite sintered body, a synthetic resin and a conductive material are used. Filled ones and the like can be used.

The shape of the radio wave absorber 4 is
Can be formed in various shapes according to the size and shape of the.

As shown in FIG. 1, a radio wave absorber 4a can be provided at a predetermined position on the side of the data carrier 3.

Further, as shown in FIG. 2, in the present invention, the radio wave absorber 4 can be brought into close contact with the data carrier 3, and the data carrier 3 and the radio wave absorber 4 can be bonded with, for example, an adhesive or the like. It can also be integrally formed by bonding together.

In this case, the size of the radio wave reflector 9 is not particularly limited, but it is preferable to use a radio wave reflector that is considerably larger than the data carrier 3 from the viewpoint of reliably transmitting and receiving radio waves.

In the present embodiment having such a configuration, when wireless data is exchanged between the antenna 2 and the data carrier 3, a part of the radio wave transmitted from the antenna 2 is reflected by the wall surfaces 5 and 6. And guided to the data carrier 3.

However, in the present embodiment, the radio wave absorbers 4 and 4a are provided behind and on the side of the data carrier 3 with respect to the antenna 2, so that the radio waves 7 traveling toward the wall surfaces 5 and 6 are absorbed. Therefore, generation of an unnecessary reflected wave 7R can be prevented.

The reflected wave 7R reflected by the wall surfaces 5 and 6 does not reach the data carrier 3 because it is absorbed by the radio wave absorber 4.

As a result, according to the present embodiment, it is possible to prevent a portion that cannot be transmitted or received from being expressed.

FIG. 3A is a front view showing a main part of another embodiment of the present invention, and FIG. 3B is a side view showing a main part of the present embodiment. As shown in FIGS. 3A and 3B,
In the present embodiment, the data carrier 3 described above, the spacer 8 having a predetermined thickness, and the radio wave reflector 9 are integrally formed by, for example, bonding with an adhesive or the like.

Here, as the radio wave reflector 9, for example,
What consists of metals, such as aluminum (Al), is used.

In the case of the present invention, the size of the radio wave reflector 9 is not particularly limited, but it is preferable to use a radio wave reflector that is considerably larger than the data carrier 3 from the viewpoint of reliably transmitting and receiving radio waves.

On the other hand, as the spacer 8, a material having a property of not absorbing radio waves, such as plastic or styrene foam, is used.

In the case of the present embodiment, the distance between the data carrier 3 and the radio wave reflector 9 is determined as follows. FIG.
FIG. 3 is an explanatory diagram illustrating a positional relationship between a data carrier and a radio wave reflector according to the present embodiment.

As shown in FIG. 4, the incident wave A from the antenna 2 and the reflected wave B from the radio wave reflector 9 which is a reflecting surface are 1
The incident wave A and the reflected wave B interfere with each other at positions different in phase by 80 degrees, that is, at positions separated by λ / 4 from the radio wave reflector 9 and at positions separated by λ / 2 from this position. , The radio waves cancel each other and transmission and reception become impossible.

Therefore, in the present embodiment, the position of the data carrier 3 coincides with a position separated by λ / 4 from the radio wave reflector 9 and a position separated by nλ / 2 (n is a natural number) from this position. The thickness of the spacer 8 is set so that it does not occur.

For example, when the operating frequency of the data carrier 3 is 2.45 GHz, λ / 4 is about 15 mm. Therefore, by setting the distance between the data carrier 3 and the radio wave reflector 9 to 10 mm, for example, Can not be expressed.

FIGS. 5 to 9 show specific application examples of the present invention. FIG. 5 shows an example in which the present invention is applied to a belt conveyor. As shown in FIG. 5, in this example, an antenna 11 is arranged on one side of a belt conveyor 10 and exchanges wireless data with a data carrier 14 attached to an article 13 conveyed by the conveyor 12. It is configured to perform.

On the other hand, a radio wave absorber 15 of a predetermined size is arranged on the opposite side of the antenna 11 with the belt conveyor 10 interposed therebetween.

According to the present embodiment having such a configuration, unnecessary radio waves transmitted from the antenna 11 are transmitted to the radio wave absorber 15.
By absorbing the data, it is possible to prevent the generation of reflected waves, and it is possible to reliably exchange wireless data between the antenna 11 and the data carrier 14 in an effective radio wave range. Can be.

FIGS. 6A and 6B show examples in which the present invention is applied to an inspection table. As shown in FIGS. 6A and 6B, in this example, an antenna 21 is disposed above a table 20, and exchanges wireless data with a data carrier 23 attached to an article 22 on the table 20. It is configured to perform.

Also, inside the table 20, for example,
A mat-shaped radio wave absorber 24 is embedded.

According to this example having such a configuration, unnecessary radio waves transmitted from the antenna 21 are transmitted to the radio wave absorber 2.
4, the wireless data can be reliably exchanged between the antenna 21 and the data carrier 24 in the effective radio wave range, so that highly accurate inspection work can be performed.

FIGS. 7 to 9 show examples in which the present invention is applied to a storage shelf. As shown in FIG. 7, in the present example, a data carrier 33 is attached to an article 32 placed on a shelf 31 of a storage shelf 30, and wireless data is exchanged with an antenna (not shown). ing.

Also, for example, the inside of the storage shelf 30
A mat-shaped radio wave absorber 34 is attached. In this case, radio wave absorbers 34 are attached to both sides of each shelf 31.

According to the present embodiment having such a configuration, unnecessary radio waves transmitted from the antenna are absorbed by the radio wave absorber 34, whereby generation of reflected waves can be prevented. Since wireless data can be reliably exchanged between the data carrier 33 and the data carrier 33, a highly accurate picking operation can be performed.

As shown in FIG. 8, in this example, an antenna 41 is arranged on a picking cart 40 and a storage shelf 42
Is configured to exchange wireless data with a data carrier 45 attached to an article 44 placed on a shelf 43 of the wireless communication device.

In this example, a data carrier 46 for transmitting and receiving information on the storage shelf is attached to a predetermined portion on the front side of the storage shelf 42.

As shown in FIG. 9, in this embodiment, a mat-shaped radio wave absorber 47 is attached to a portion on the inner rear side of the storage shelf 42.

According to this example having such a configuration, unnecessary radio waves transmitted from the antenna 41 are transmitted to the radio wave absorber 47.
As a result, the generation of reflected waves can be prevented, and wireless data can be reliably exchanged between the antenna 41 and the data carriers 45 and 46 in an effective radio wave area. It can be carried out.

[0055]

EXAMPLE A data carrier system according to the present invention was applied to a belt conveyor, and a radio wave range effective for data carrier operation was confirmed.

As shown in FIGS. 10A and 10B, in this example, an antenna 51 is arranged on one side of the belt conveyor 50, and both upper edge portions of a case 53 conveyed by the belt conveyor 50. It is configured to exchange wireless data with a pair of data carriers 54 attached to.

A radio wave absorber 55 is arranged on the opposite side of the antenna 51 with the belt conveyor 50 interposed therebetween so as to concentrically face the antenna 51.

In this case, as the data carrier 54,
With a size of 60.2 × 9.4 mm (SCS D
L100) was used.

The size of the antenna 51 is 3
With a frequency of 2.45 GHz with a size of 00 x 300 mm (AWS-14-33KV manufactured by Nippon Information Co., Ltd.)
Was used.

On the other hand, the radio wave absorber 55 has a size of 600 × 450 mm, a thickness of 125 mm, and is made of urethane foam and filled with carbon (EHP-Lantec EHP-450).
5) was used.

Further, the system was configured such that the distance between the antenna 51 and the radio wave absorber 55 was 960 mm.

Then, the height of the data carrier 54 is changed by changing the size of the case 53, and the horizontal position of the data carrier 54 is changed by changing the position where the case 53 is conveyed on the belt conveyor 50. Whether or not the carrier 54 operates was determined based on whether or not reading by a data carrier reading device (not shown) was possible.

As a result, as shown in FIGS. 10A and 10B, it was confirmed that the data carrier 54 operates in the area between the antenna 51 and the radio wave absorber 55 and on the antenna 51 side. .

It has been confirmed that the height of the data carrier 54 is preferably arranged near the center of the antenna 51 and the radio wave absorber 55.

FIGS. 11A and 11B show a more preferable system configuration in the case of this example. FIG.
As shown in (a), in the present example, first and second data carrier systems 1a and 1b each including a pair of antennas and a radio wave absorber are arranged close to each other along a belt conveyor 50.

In this case, in the first data carrier system 1a and the second data carrier system 1b, the arrangement of the antennas 51a, 51b and the radio wave absorbers 55a, 55b is reversed, and the antenna 51a, the radio wave absorber 55b, The antenna 51b and the radio wave absorber 55a are connected to the belt conveyor 5.
It is configured to be adjacent along 0.

As shown in FIG. 11B, in this example, the data carriers 54 provided on both upper edges of the case 53 are connected to the antennas 51a and 51b and the radio wave absorber 55.
The size of the case 53 is determined so as to be located at the center of the a and 55b.

In this example having such a configuration,
By absorbing unnecessary radio waves transmitted from the antennas 51a and 51b by the radio wave absorbers 55a and 55b, it is possible to reliably prevent the generation of reflected waves in the region above the belt conveyor 50.
Since wireless data can be reliably exchanged between the data carrier 1b and the data carrier 54, highly accurate sorting and the like can be performed.

[0069]

As described above, according to the present invention, it is possible to provide a data carrier system using a contactless wireless data carrier capable of transmitting and receiving all radio waves in an effective radio wave area.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of a data carrier system according to the present invention.

FIG. 2 is a schematic configuration diagram showing a main part of a modified example of the present invention.

FIG. 3 (a) is a front view showing a main part of another embodiment of the present invention. (B): It is a side view which shows the principal part of the embodiment.

FIG. 4 is an explanatory diagram showing a positional relationship between a data carrier and a radio wave reflector in the embodiment.

FIG. 5 is a perspective view showing an example in which the present invention is applied to a belt conveyor.

FIGS. 6A and 6B are perspective views showing that the present invention is applied to an inspection table.

FIG. 7 is a perspective view showing an example in which the present invention is applied to a storage shelf.

FIG. 8 is a perspective view showing an example in which the present invention is applied to a storage shelf.

FIG. 9 is a sectional view showing an example in which the present invention is applied to a storage shelf.

FIGS. 10A and 10B are diagrams for illustrating a radio wave range effective for operation of a non-contact wireless data carrier.

11A and 11B are diagrams showing a more preferable system configuration of the present invention.

FIG. 12 is a diagram for explaining the cause of the inability to transmit and receive radio waves in a non-contact wireless data carrier.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Data carrier system 2 ... Antenna 3 ... Non-contact type wireless data carrier 4 ... Radio wave absorber 5, 6 ... Wall (reflection surface)

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Takashi Omata 19-19-20 Higashisuna, Koto-ku, Tokyo Inside Toyo Kanetsu Co., Ltd. (72) Isao Tomon Inventor 2-1-16 Hamamatsucho, Minato-ku, Tokyo SVAX Hamamatsucho II Building F Term in Japan Information System Co., Ltd. (Reference) 5B035 BB09 CA23 5B058 CA15 5J020 EA05 EA06 EA09

Claims (4)

[Claims] 1. A data carrier system comprising a non-contact wireless data carrier (3) capable of transmitting and receiving a predetermined radio wave to and from an antenna (2) arranged at a predetermined position, wherein the non-contact wireless data A data carrier system, wherein a radio wave absorber (4) is arranged at a predetermined position near a carrier (3). 2. The data carrier system according to claim 1, wherein said radio wave absorber is disposed on a rear side of said contactless wireless data carrier with respect to said antenna. . 3. The wireless data carrier according to claim 1, wherein the radio wave absorber is disposed on a side of the non-contact wireless data carrier with respect to the antenna. The data carrier system according to claim 1. 4. A data carrier system comprising a non-contact wireless data carrier (3) capable of transmitting and receiving a predetermined radio wave to and from an antenna (2) arranged at a predetermined position. A data carrier system, wherein the carrier (3) is integrally formed with a radio wave reflector (9) for reflecting a predetermined radio wave at a predetermined distance.