JP4445883B2 - Wireless data carrier writing / reading system - Google Patents

Description

  The present invention relates to a wireless data carrier system for writing and reading data to and from a data carrier in a contactless manner.

  Conventionally, as a general use of a wireless data carrier, an article to which a radio data carrier is attached is obtained by receiving a radio wave emitted from a wireless data carrier as an object to be read with a reader. Has been put into practical use in the form of a so-called RFID system (Radio-Frequency-IDentification-system) that performs operations such as management, tracking, inspection, and sorting. Data is also written to the wireless data carrier in a non-contact manner by transmitting radio waves from the writer to the wireless data carrier.

  The wireless data carrier described above includes a battery type having a battery and a batteryless type that does not have a battery and operates by electric power supplied from a reader / writer antenna via radio waves. This batteryless wireless data carrier generates electric waves modulated by data written in the wireless data carrier, that is, response waves, using power supplied from the antenna via the electric waves. Subsequently, the reader receives the response wave and reads the data in the wireless data carrier. Therefore, when the radio data carrier operating radio wave sent from the antenna is weak, the power obtained by the radio data carrier becomes weak, and the response wave becomes weak accordingly. There is a case.

  In particular, when reading a wireless data carrier attached to an article that is automatically conveyed by a conveyor, such as an article conveyance system, the radio wave transmitted from the antenna is reflected by the metal constituting the conveyor, causing interference. As a result, there may be a place where the radio wave transmitted from the antenna is weakened, making it impossible to read. Specifically, one of the components of the belt conveyor, the interference of radio waves reflected from a metal plate installed at the bottom of the belt for the purpose of holding the belt itself is weakened by radio waves sent from the antenna. This is the cause of many places.

  In addition, in the case of roller conveyors, there is interference from reflected waves from metal rollers, and in the case of metal belt conveyors that use metal belts for conveying articles, there is interference from reflected waves from the metal belt surface. This causes a lot of weakened places and causes a failure to be unreadable. In addition, the reliability of the writing to the wireless data carrier is significantly deteriorated in a place or a state where the radio wave transmitted from the antenna becomes weak.

Here, a situation in which the above-described radio wave strength occurs will be described with reference to FIG.
In the wireless data carrier writing / reading system in FIG. 17 (FIG. 2), the writing reader 2 and the antenna 3 are installed on the upper part of the conveyor 4, and the wireless is attached to the upper surface of the article 5 conveyed by the conveyor 4. In order to read / write data from / to the wireless data carrier 1, the radio power carrier 1 is radiated downward from the antenna 3 toward the wireless data carrier 1. . The articles 5 are sequentially conveyed from the left hand side of FIG. 17 which is the upstream side of the conveyor 4 toward the right hand direction which is the downstream side of the conveyor 4.

  In such a case, a belt, a roller, a metal belt, etc. are used as a means for conveying articles in a general conveyor, but when the belt conveyor is taken as an example, the belt is held by a metal plate provided under the belt conveyor. It is structured to slide on the upper surface of the metal plate. In order to reduce the noise generated during the operation of the conveyor, a sheet made of a material having low sliding resistance may be stuck on the sliding surface of the metal plate. A large metal plate is attached for the purpose of holding the belt in the vicinity. In the example of FIG. 17 (FIG. 2), the “belt” corresponds to the transmissive transport unit 7 that transmits radio waves, and the “metal plate” corresponds to the reflective holding unit 18 made of metal or the like that reflects radio waves. .

  As described above, the operating power supply radio wave 21 radiated from the antenna 3 is reflected by the reflective holding unit 18 to generate a reflected wave 22, which interferes with the operating power supply radio wave 21. As a result, a phenomenon occurs in which the strength of the operating power supply radio wave 22 changes, and the wireless data carrier 1 cannot be stably read / written at a position where the operating power supply radio wave 22 is weakened.

  Therefore, the wireless data carrier 1 is provided with a radio wave reflector that functions in the same manner as the reflection type holding unit 18 so as to block unnecessary reflected waves 22 from the belt conveyor and the like, and at the same time, the operating power supply radio wave 21 is actively supplied. There has been considered a method of performing stable reading and writing by reflecting, stably creating a position where the radio wave is strong, and providing the wireless data carrier 1 at the position where the radio wave is strong. This method is a well-known technique, and an embodiment in which a reflector is attached to the back surface of a plate to which a wireless data carrier is attached is disclosed in JP 2002-230507 “Data carrier system” and JP 2003-198422 “Container use”. The RFID tag communication distance extending method ”is disclosed.

Japanese Patent Laid-Open No. 2002-230507 JP 2003-198422 A

  However, in the above-mentioned JP-A-2002-230507, as shown in FIG. 20 (FIG. 5), it is necessary to attach the transmission plate 33 and the reflection plate 6 made of a material that transmits radio waves for each wireless data carrier. The cost increase of the wireless data carrier was inevitable. In this embodiment, the distance between the wireless data carrier 1 and the reflector 6 is described as about 10 mm, but at this value, the entire wireless data carrier including the transmission plate 33 and the reflector 6 is thinned. For example, it is difficult to apply to a thin sheet-like transported object such as an envelope. Furthermore, Japanese Patent Application Laid-Open No. 2003-198422 also has a problem in that the reflector 6 is attached to each container 34 as shown in FIG. 21 (FIG. 6).

  Accordingly, an object of the present invention is to provide a wireless data carrier writing that realizes cost reduction and thickness reduction by eliminating the mounting of the plate and the reflector itself to the wireless data carrier itself that causes such problems. To provide a reading system.

  Another object of the present invention is to provide a wireless data carrier writing / reading system that further reduces costs by eliminating the need to attach a reflector to each container.

In order to solve the above problems, in the first configuration of the present invention, a conveyor having a transport unit for moving an article, a wireless data carrier, and data writing to the wireless data carrier attached to the article And a wireless data carrier writing / reading system comprising a writing reader for reading data from the wireless data carrier and an antenna connected to the writing reader,
The antenna is installed on the upper part of the conveyor, and the conveyor holds and moves the mounted article, and a radio wave transmission type transfer unit formed of a material that transmits radio waves, and a wireless type attached to the article between The first radio wave reflection unit installed at a position facing the antenna so that the data carrier moves, and the installation position of the first radio wave reflection unit as a reference position, and the wavelength of the used radio wave from the reference position is (2n + 1) / The wireless data carrier attached to the article is placed at a position far from or near by a length of 4 times (n is a positive integer including 0), and at a position facing the antenna so as to move between them. The second radio wave reflector,
The antenna further comprises a wireless data carrier writing / reading system installed at a position where radio waves transmitted by the antenna can reach both the first radio wave reflection unit and the second radio wave reflection unit. And

In the second configuration of the present invention, in addition to the first configuration, the wireless data carrier attached to the article moves between the other side portion of the conveyor and the first antenna at a position facing the antenna. It is characterized in that a radio wave reflection part and a second radio wave reflection part are respectively installed .

Further, in the third configuration of the present invention, in addition to the first configuration or the second configuration , a radio wave transmitting material is further provided in the gap between the radio wave transmission type transport unit and the first radio wave reflection unit or the second radio wave reflection unit plate. A spacer is provided, and the installation distance between the transport unit and the first radio wave reflection unit or the second radio wave reflection unit is shortened according to the relative dielectric constant of the radio wave transmission material .

Further, in the fourth configuration of the present invention, a conveyor having a transport unit for moving an article, a wireless data carrier, writing of data to the wireless data carrier attached to the article, and the wireless data carrier In a wireless data carrier writing / reading system comprising a writing reader for reading data from and an antenna connected to the writing reader,
The first and second antennas are installed on the upper part of the conveyor, and the conveyor includes a radio wave transmission type transport unit formed of a material that transmits radio waves, which holds and moves the placed article, and the article is interposed between The first radio wave reflection unit installed at a position facing the first antenna so that the attached wireless data carrier moves, and the installation position of the first radio wave reflection unit is used as a reference position, and used from the reference position. The wireless data carrier attached to the article moves in a position that is far or close by a length of (2n + 1) / 4 times the wavelength of the radio wave (n is a positive integer including 0). It is characterized by comprising the second radio wave reflecting portion installed opposite to the antenna .

The fifth configuration of the present invention is characterized in that, in addition to the fourth configuration, the installation position of the second antenna is set to one side portion of the conveyor .

Further, in the sixth configuration of the present invention, a conveyor provided with a transport unit for moving an article, a wireless data carrier, data writing to the wireless data carrier attached to the article, and the wireless data carrier In a wireless data carrier writing / reading system comprising a writing reader for reading data from and an antenna connected to the writing reader,
The distance between the antenna installed on the upper part of the conveyor, the reflection type conveying unit made of a radio wave reflecting material and installed in parallel with the antenna, and the antenna installed on the upper part of the conveyor is the reflection type. A radio wave reflection unit provided at a position far or close by a length of (2n + 1) / 4 times the wavelength of the radio wave used (n is a positive integer including 0) with the installation position of the transport unit as a reference position; A position where a radio wave transmission type conveyance unit that transmits radio waves from the antenna is provided above the reflection unit, and a radio wave transmitted at a position above the conveyor can reach both the reflection type conveyance unit and the radio wave reflection unit It is characterized in that the antenna is installed .

Further, in the seventh configuration of the present invention, in addition to the sixth configuration, the gap between the radio wave transmission type transport unit and the radio wave reflection unit is filled with a radio wave transmission material, and is made to correspond to the relative dielectric constant of the radio wave transmission material. The distance between the wireless data carrier and the radio wave reflection unit is shortened .

Further, in the eighth configuration of the present invention, an antenna installed on an upper part of the conveyor, a radio wave transmission type transport unit formed of a material that transmits radio waves and holds and moves the placed article, and the radio wave transmission type transport unit In the first and second conveyors having a reflection type holding part made of a radio wave reflecting material for holding the part, the article is transferred across the connection end of the first and second conveyors, and the distance from the antenna In
Position far from the installation position of the radio wave transmission type conveyance part of the first conveyor by a length of (2n + 1) / 4 times the wavelength of the radio data carrier use radio wave (n is a positive integer including 0) Alternatively, the radio wave transmission type conveyance unit of the second conveyor is disposed at a close position, the antenna is above the connection end of the first conveyor and the second conveyor, and the transmission radio wave is the first and second conveyors. It is characterized by being installed at a position that can reach both .

Further, in the ninth configuration of the present invention , a radio wave transmission type transport unit made of a material that transmits radio waves, which moves an article placed on the conveyor, an antenna installed on the upper part of the conveyor, and the antenna A plurality of radio wave reflectors arranged in an arbitrary width that reflects the radio wave of the radio data carrier, and the distance between the plurality of reflectors of the radio wave reflector having the arbitrary width and the antenna is Take a unique value with a fixed pitch within a range of 1/4 or more of the wavelength, and the unique value is randomly distributed within the range of the arbitrary width. A reflection part of the radio wave reflection part having the arbitrary width is provided.

Further, in the tenth configuration of the present invention, in addition to the ninth configuration, the arbitrary value is arranged with respect to the radio wave transmission type transport unit so that the unique value is stepwise arranged in descending order or ascending order within the range of the arbitrary width. A reflection part of the radio wave reflection part having a width is provided.

In the eleventh configuration of the present invention, in addition to the ninth configuration or the tenth configuration, a spacer made of a radio wave transmitting material is provided in a gap between the radio wave transmission type transport unit and the radio wave reflection unit having an arbitrary width. The installation distance between the radio wave transmission type conveying unit and the radio wave reflection unit having the arbitrary width is shortened so as to correspond to the relative dielectric constant of the radio wave transmission material .

  According to the present invention, it is possible to provide a wireless data carrier writing / reading system that realizes cost reduction and thickness reduction by eliminating the attachment of a plate and a reflector to the wireless data carrier itself.

  Further, it is possible to provide a wireless data carrier writing / reading system that further reduces the cost by eliminating the attachment of the reflecting plate to each container.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 16 are configuration diagrams showing an embodiment of the present invention.

The embodiment shown in FIG. 1 includes a wireless data carrier 1 attached to an article 5 transported and moved on a conveyor 4 and a writing / reading operation for writing and reading data to and from the wireless data carrier 1 by transmitting and receiving radio waves. conveyed vessel 2, an antenna 3 connected to the write reader 2, the conveyor 4, a reflector 6 disposed in the lower part of the conveyor consists of a material that reflects radio waves, the article 5 on the conveyor 4 It is comprised by the transmissive | pervious conveyance part 7 comprised with the material which permeate | transmits the radio wave to move.

  Next, the operation of the first embodiment of the present invention will be described in detail with reference to FIG. First, the operating power supply radio wave 21 for the wireless data carrier 1 radiated from the antenna 3 collides with and interferes with the reflected wave 22 from the reflector 6. FIG. 18 (FIG. 3) shows this interference state. The reflector 6 in FIG. 18 is a general metal plate made of a material that reflects radio waves, similar to the reflector 6 used in the ordinary conveyor shown in FIG. The operating power supply radio wave 21 radiated from the antenna 3 collides with the reflector 6 and is reflected. The reflected wave 22 from the reflecting plate 6 interferes with the operating power supply radio wave 21. At this time, the supply radio wave 21 and the reflected wave 22 "interfere with sine waves having the same wavelength and amplitude and traveling in opposite directions to each other". Therefore, a standing wave 23 having an amplitude larger than that of the operating power supply radio wave 21 and having a “wave antinode” at the antinode position 30 and a “wave node” at the node position 31 is generated. .

The antinode position 30 and the node position 31 of the standing wave 23 are always determined by the distance from the reflector 6 regardless of the distance between the reflector 6 and the antenna 3. That is, the operating power supply radio wave 21 becomes a standing wave 23, which is measured from the reflector 6 and is derived by the following equation: λ (2n + 1) / 4 (where n is a positive integer)
The intensity is maximized at the position 30 of each belly. Here, λ indicates the wavelength of the operating power supply radio wave 21. In other words, the position where the radio wave that appears first is the “position at a distance of λ / 4 from the reflector 6”, and thereafter the position where the radio wave increases appears at intervals of λ / 2. Therefore, when the wireless data carrier 1 comes to an antinode where the radio wave is strengthened, high operating power can be obtained, so that the writing and reading operations are most stable.

Also, measured from the reflector 6 and derived by the following equation n (λ / 2) (where n is a positive integer including 0)
Since the strength of the standing wave 23 is the weakest at the position of each node 31, when the wireless data carrier 1 comes to this position, the writing / reading operation is most unstable . Therefore, in order to perform stable writing / reading operation with respect to the wireless data carrier 1, when expressed using the λ, the reflection plate 6 facing the antenna 3 is expressed by the following equation:
λ (2n + 1) / (where n is a positive integer including 0)
It is sufficient to move the wireless data carrier 1 on the belt conveyor so as to pass in the vicinity of. From the above, in the configuration shown in FIG. 1, the distance between the wireless data carrier 1 and the reflector 6 is expressed by the following equation:
λ (2n + 1) / 4 (where n is a positive integer including 0)
The reflection plate 6 is provided so that By doing so, the wireless data carrier 1 always passes the antinode position 30 of the standing wave 23, and stable reading and writing are possible. The height of the article to be read or written is generally the same in the lot unit or the product unit, but varies depending on the lot or product. Therefore, in the embodiment shown in FIG. In addition, a reflection plate attachment height setting section that enables adjustment of the attachment height of the reflection plate is also provided.

In the second embodiment shown in FIG. 2, a spacer 10 that transmits a radio wave having a relative dielectric constant α is inserted in a gap between the transmission type conveyance unit 7 and the reflection plate 6. This makes it possible to shorten the installation distance between the transmission type conveyance unit 7 and the reflection plate 6 by using “the reciprocal of the square root of the relative dielectric constant α” as a magnification, and to reduce the thickness of the conveyor. This is based on the fact that the relationship that “the wavelength of the radio wave in the dielectric is proportional to the inverse of the square root of the dielectric constant α of the dielectric” is established. Therefore, the higher the relative dielectric constant, the shorter the wavelength λ, and the thickness of the conveyor can be reduced. The specific value of the relative dielectric constant of a general material that can be used as the spacer 10 is, for example, 2.5 for polystyrene-based ABS resin and about 3.5 for polyvinyl chloride (PVC). Here, if a 900 MHz radio wave is used as the operating power supply radio wave 21, its wavelength is 33.3 cm and λ / 4 is 8.3 cm. By filling the ABS resin,
8.3 / √2.5 = 5.3 (cm)
It is possible to reduce the installation distance between the transmissive conveyance unit and the reflector to an extent. Also in the case of polyvinyl chloride (PVC),
8.3 / √3.5 = 4.4 (cm)
It is possible to shorten the installation distance between the transmission type conveyance unit and the reflection plate to the extent.

In recent years, wireless systems such as wireless LAN and non-stop automatic fee payment system (ETC: Electronic-Toll-Collection-system) have been put into practical use and rapidly spread. However, because of the miniaturization of antennas used in these systems. In addition, materials with a relative dielectric constant as high as about 10 have been researched and developed. This is because the antenna can be miniaturized by shortening the wavelength by filling the path of the radio wave with a dielectric. By using these materials,
8.3 / √10 = 2.6 (cm)
The installation distance between the transmission type transport unit and the reflector can be shortened to the extent that a very thin conveyor can be realized.

  The embodiment shown in FIGS. 1 and 2 is an embodiment when the thickness of the article 5 such as an envelope or the same article is constant, but the wireless data carrier 1 when the thickness of the article 5 changes variously. It is very difficult to always pass the wave in the antinode position 30 of the standing wave 23, and stable reading and writing are difficult. An embodiment corresponding to the case where the thickness of the article 5 changes as described above will be described with reference to FIGS.

  In the embodiment shown in FIG. 3, the transmissive transfer unit 7 made of a material that transmits radio waves in the transfer unit that holds and moves the articles on the conveyor and the antenna 3 that reflects radio waves from the antenna 3 are arranged in parallel. One reflector 11 and the antenna 3 that reflects radio waves from the antenna 3 are installed in parallel to the first reflector 11 at a position that is a distance of λ (2n + 1) / 4 (where n is a positive integer). The second reflector 12 is provided, and the antenna 3 is installed at a position where the radio wave from the antenna 3 reaches both the first reflector 11 and the second reflector 12 at a position above the conveyor 4. The antenna 3 is a type of antenna that radiates and receives radio waves over the entire surface. Here, as in the case of the above-described embodiment, the reflected wave 8b by the reflector 11 interferes with the operating power supply radio wave 8a and thereby has a larger amplitude than the operating power supply radio wave 8a. And a standing wave 23 having a “wave node” shown at each node position 31 is generated.

  Therefore, when the position of the wireless data carrier 1 is the height of the article so that the position of each node of the standing wave 23 is the position 31, the operation power supply radio wave 8a is weakened, so that stable writing and reading are possible. Is impossible. Therefore, the second reflector 12 that reflects the operating power supply radio wave 9a radiated from the downstream side of the conveyor of the antenna 3 is 2n + 1 of the wavelength λ of the radio wave used by the wireless data carrier 1 with respect to the first reflector 11. / 4 (where n is a positive integer). Here, the operating power supply radio wave 9a also interferes with the reflected wave 9b from the second reflector 12 and generates a standing wave 23 having a node and a belly. Therefore, when the wireless data carrier 1 is at the node position 31, writing and reading are impossible. However, as shown in FIG. 4, the installation distance of the first reflecting plate 11 and the second reflecting plate 12 from the antenna 3 is a length of 2n + 1/4 (n is a positive integer) of the wavelength of the radio wave used by the wireless data carrier 1. Since it is provided far away, the intensity of the standing wave generated by the interference of the reflected wave 9b at the height above the transmission type conveyance unit 7 where the intensity of the standing wave 23 caused by the reflected wave 8b is minimized is the antinode. And become the maximum. That is, the phase of the standing wave 23 by the reflected wave 8b and the standing wave by the reflected wave 9b are shifted by λ (2n + 1) / 4 (n is a positive integer), so that the node portion is complemented by the other antinode portion. It becomes possible.

  FIG. 4 shows a state where n = 1, and shows that the antinodes and nodes of the standing wave 23 caused by the reflecting plate 11 and the standing wave 23 caused by the reflecting plate 12 complement each other. That is, the wireless data carrier 1 of an article having a height that cannot be read on the operating power supply radio wave 8a side is read on the operating power supply radio wave 9a side, and the article wireless having a height that cannot be read on the operating power supply radio wave 9a side. The expression data carrier 1 can be read on the operating power supply radio wave 8a side. As a result, stable reading is possible regardless of where the wireless data carrier 1 is placed on the conveyor 4.

  Further, since the complementary relationship between the antinodes and nodes of the standing wave 23 by the operating power supply radio wave 8a and the standing wave by the operating power supply radio wave 9a does not depend on the installation position of the transmission type transport unit 7 shown in FIG. 3 can be arbitrarily determined. However, since the transmission type transport unit 7 and the first reflection plate 11 and the second reflection plate 12 are generally included in the conveyor, the transmission type transfer unit 7 is the first in terms of reducing the thickness of the conveyor itself. It is desirable to install it at a position in direct contact with the reflecting plate 11.

  Here, the present embodiment can generate a plurality of standing waves regardless of a single antenna connected to a single radio wave generation source. A major feature is that the phase difference can be freely controlled by installing only an inexpensive reflector. In other words, it can be realized with only a single antenna, a single writer / reader, and an inexpensive reflector, which is a general metal plate, so it is possible to significantly reduce the cost. Even with an existing conveyor, only the reflector is installed. It can be easily converted into a conveyor capable of high reading rate and reliable writing on a wireless data carrier.

  In addition, the wireless data carrier may have a reading direction and a writing direction defined with respect to the wireless data carrier, and in response to this, when performing reading and writing from the horizontal direction, the implementation shown in FIG. FIG. 4 shows a fourth embodiment realized by applying the embodiment. In the fourth embodiment, the writing reader 2 and the antenna 3 are installed on one side of the conveyor 4 and the first reflecting plate 11 and the second reflecting plate 12 having the above-mentioned distance difference are installed on the other side. Configured. As a result, the node portion of one standing wave can be complemented by the antinodes of the other wave, and the wireless data carrier is placed on any portion of the conveyor 4 as in the third embodiment. Needless to say, it is possible to read even if the user is present.

  Further, FIG. 5 shows a fifth embodiment in which the installation distance between the transmission type conveyance unit 7 and the reflection plate 12 is shortened by providing the spacer 10 in the third embodiment as in FIG.

  FIG. 6 shows a sixth embodiment in which the writing reader 2, the antenna 3, the first reflecting plate 11, the second reflecting plate 12, and the spacer 10 according to the fifth embodiment are installed horizontally so as to sandwich the conveyor 4. The form is shown.

  FIG. 7 shows a seventh embodiment in which the third embodiment is constituted by two write readers and two antennas. Since the operation itself is the same as that of the third embodiment, the description is omitted.

  FIG. 8 shows an eighth embodiment in which the seventh embodiment is a horizontal installation type.

  FIG. 9 shows a ninth embodiment in which the installation distance between the transmission type conveyance unit 7 and the reflector 12 is shortened by installing the spacer 10 in the seventh embodiment, as in the second embodiment. FIG. 10 shows a tenth embodiment in which the ninth embodiment is horizontally installed.

  FIG. 11 is an eleventh embodiment showing a case where a steel belt conveyor made of metal or the like that reflects radio waves is used for the upstream conveyor, and the first reflector 11 in the third embodiment shown in FIG. The feature is that the reflection of the radio wave is realized by the reflection type conveyance unit 17. Since the operation itself is the same as that of the third embodiment, the description is omitted.

  Further, FIG. 12 shows that the installation distance between the transmission type conveyance unit 7 and the reflection plate 6 is shortened by additionally providing the spacer 10 in the eleventh embodiment as in the second embodiment. This is the twelfth embodiment. FIG. 13 shows a thirteenth embodiment that is realized by using two conveyors each having a transmissive transfer section 7 that transmits radio waves. The operation itself is the same as that of the seventh embodiment, and the description is omitted.

  FIG. 14 shows a fourteenth embodiment using two conveyors each having a reflection type conveying section 17 such as a steel belt that reflects radio waves. A feature is that the operations of the reflecting plate 11 and the reflecting plate 12 in the seventh embodiment are performed by the reflection-type transport unit 17. Since the operation itself is the same as that of the seventh embodiment, the description is omitted.

  FIG. 15 shows an embodiment in which the reflector 6 is installed obliquely. In each of the first to fourteenth embodiments, the two reflectors are installed apart by a fixed distance of λ (2n + 1) / 4 (n is a positive integer). In the fifteenth embodiment, the phase shift of the standing wave is continuously changed by installing the reflecting plate obliquely.

  Hereinafter, the continuous change in the phase shift will be described with reference to the drawings. First, in FIG. 15, when the article 5 is moved from the left side to the right side of the drawing by the transmission type conveyance unit 7 and the wireless data carrier 1 reaches just above the upstream end 19 of the reflector 6, the first operating power supply is performed. The phase of the standing wave 23 by the radio wave 8 a becomes a node at the position of the wireless data carrier 1. At this time, since the standing wave 23 is weakened, it is difficult to write or read the wireless data carrier 1 as described above.

  However, in the present embodiment, since the reflector 6 is installed obliquely, the distance between the reflector 6 and the wireless data carrier 1 continuously changes as the article 5 advances in the right direction. As a result, the phase of the standing wave 23 incident on the wireless data carrier 1 also continuously changes, and the wireless data carrier 1 alternates between the antinode and node states of the standing wave 23 as the article 5 advances in the right direction. Will pass by. That is, even when the wireless data carrier 1 arrives just above the upstream end 19 of the reflector 6, even if the state transitions to the node state of the standing wave 23, the wireless data carrier 1 moves as the article 5 moves rightward. Will change the state of the antinode and node of the standing wave 23 alternately, and the wireless data carrier 1 can be written and read.

  The deviation of the standing wave 22 between the upstream end 19 and the downstream end 20 needs to be λ / 4. This is a state of a node at the upstream end 19, and it becomes a belly state at the downstream end 20. In order to achieve this, it is clear that a shift of λ / 4 is necessary, and the shift between the upstream end 19 and the downstream end 20 of the reflector 6 needs to be λ / 4 or more. However, if this deviation is increased, the state of the antinodes and nodes of the standing wave 23 incident on the wireless data carrier 1 changes in a short time. 23 is weakened or the reflection direction of the reflected waves 8b and 9b is shifted and the strength of the standing wave 23 is lowered. From the above, the fifteenth embodiment is a preferred embodiment that is preferably applied when the article conveyance speed is low. However, what requires a shift of λ / 4 or more is not limited to between the upstream end 19 and the downstream end 20. For example, when the distance from the wireless data carrier 1 at the upstream end 19 is 11, the distance from the wireless data carrier 1 at the downstream end 20 is ln, and this is divided into n in the width direction of the reflector 6, If they are arranged in ascending or descending order, the phase will change continuously as shown in the fifteenth embodiment. Even if the arrangement of l1 to ln is randomly arranged and discontinuously changed, the article Needless to say, if the conveyance speed is sufficiently slow, the antinode portion can be finally detected within the width of the reflector 6. This is the sixteenth embodiment.

  FIG. 16 is a seventeenth embodiment in which the installation distance between the transmission type conveyance unit 17 and the reflecting plate 6 is shortened by providing the spacer 10 in the fifteenth embodiment as in the second embodiment. is there.

  In the present invention, the description is mainly based on the embodiment based on the premise that the reflector is installed at a “fixed position”, but it goes without saying that an embodiment provided with a reflector position adjustment mechanism is also possible. . In addition, in the combination of the conveyor composed of the transmission type conveyance unit and the conveyor composed of the reflection type conveyance unit, it is arbitrary which is installed on the upstream side or the downstream side, and the present invention can be implemented in any combination. It is.

  In the present embodiment, an embodiment is described in which the spacer is provided on the upper part of the second reflecting plate. However, it is also possible to provide the spacer on the upper part of the first reflecting plate and both. Further, in the present embodiment, the embodiment is described with an automatic conveyor that automatically conveys, but the present invention can also be carried out on a conveyor that does not have a manual or motor drive unit. In the present embodiment, an embodiment is described in which an article such as a conveyor is received and transported by a surface, but the present invention is also applied to a system in which an article is received by receiving, fixing, or hanging only the end of the article. It can be implemented in the invention. In this embodiment, the embodiment up to the combination of two writing readers, antennas, and conveyors is assumed. However, by further combining three, four,... It is also possible to implement high performance by further increasing the density in the present invention.

1 is a configuration diagram showing a first embodiment of a wireless data carrier writing / reading system of the present invention (one antenna upper side, one radio wave reflection unit lower side, no spacer). FIG. It is a block diagram which shows 2nd embodiment (1 antenna upper side, 1 electromagnetic wave reflection part lower side, and a spacer) of the wireless type data carrier writing / reading system of this invention. It is a block diagram which shows 3rd embodiment (The antenna upper side 1 group, radio wave reflection part lower side 2 sheets, without a spacer) of the radio | wireless type data carrier writing / reading system of this invention. It is a block diagram which shows 4th embodiment (The antenna lateral side 1 group, the electromagnetic wave reflection part 2 sheets side, no spacer) of the wireless-type data carrier writing-reading system of this invention. It is a block diagram which shows 5th embodiment (The antenna upper side 1 group, the electromagnetic wave reflection part lower side 2 sheets, a spacer is provided) of the wireless-type data carrier writing-reading system of this invention. It is a block diagram which shows 6th embodiment (antenna side installation, two radio wave reflection part side installation, a spacer is provided) of the radio | wireless data carrier writing / reading system of this invention. It is a block diagram which shows 7th embodiment (2 antenna upper side installation, 2 electromagnetic wave reflection part lower side installation, no spacer) of the radio | wireless type data carrier writing / reading system of this invention. It is a block diagram which shows 8th embodiment (Two antenna side sides, two electromagnetic wave reflection part side sheets, and no spacer) of the wireless data carrier writing / reading system of this invention. It is a block diagram which shows 9th embodiment (2 antenna upper side, 2 electromagnetic wave reflection part lower side, and a spacer) of the wireless data carrier writing / reading system of this invention. It is a block diagram which shows 10th Embodiment (2 antenna lateral sides, 2 sheets of radio wave reflection part lateral sides, and a spacer) of the wireless data carrier writing / reading system of this invention. It is a block diagram which shows 11th Embodiment (1 antenna upper side, 1 radio wave reflection part lower side, 1 reflection type conveyance part, and no spacer) of the radio | wireless type data carrier writing / reading system of this invention. It is a block diagram which shows 12th Embodiment (1 antenna upper side, 1 radio wave reflection part lower side, 1 reflection type conveyance part, and a spacer) of the radio | wireless type data carrier writing / reading system of this invention. It is a block diagram which shows 13th Embodiment (2 antenna upper side, 2 reflection type holding | maintenance parts, no spacer) of the wireless data carrier writing / reading system of this invention. It is a block diagram which shows 14th embodiment (2 antenna upper side, 2 reflective conveyance parts, and no spacer) of the radio | wireless type data carrier writing / reading system of this invention. It is a block diagram which shows 15th embodiment (1 antenna upper side, radio wave reflector oblique installation, no spacer) of the wireless data carrier writing / reading system of this invention. It is a block diagram which shows 16th embodiment (1 antenna upper side, radio wave reflector oblique installation, with a spacer) of the wireless data carrier writing / reading system of this invention. 1 is a diagram showing a basic example of a wireless data carrier writing / reading system for writing / reading a wireless data carrier on an article conveyed by a conveyor. FIG. It is explanatory drawing which shows the reflective state of the electromagnetic wave in a reflecting plate. It is explanatory drawing which shows the reflective state of the electromagnetic wave in two reflectors. It is a figure which shows an example (Unexamined-Japanese-Patent No. 2002-230507) of a prior art. It is a figure which shows the other example (Unexamined-Japanese-Patent No. 2003-198422) of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wireless data carrier 2 Write reader 3 Antenna 4 Conveyor 5 Goods 6 Reflector 7 Transmission type | mold part 8a 1st operation | movement electric power supply electric wave 8b 1st reflected wave 9a 2nd electric power supply electric wave 9b 2nd reflected wave DESCRIPTION OF SYMBOLS 10 Spacer 11 1st reflecting plate 12 2nd reflecting plate 13 1st writing reader 14 1st antenna 15 2nd writing reader 16 2nd antenna 17 Reflecting type conveyance part 18 Reflecting type holding | maintenance part 19 Upstream end 20 Downstream Side end 21 Operating power supply radio wave 22 Reflected wave 23 Standing wave 24 Reflector mounting height setting part 30 Standing wave antinode 31 Standing wave node position 33 Non-metallic plate 34 Non-metallic container

Claims (11)

Conveyor having a transport unit for moving an article, a wireless data carrier, and writing / reading for writing data to the wireless data carrier attached to the article and reading data from the wireless data carrier And a wireless data carrier writing / reading system comprising an antenna and an antenna connected to the writing / reading device,
The antenna is installed on the upper part of the conveyor, and the conveyor holds and moves the mounted article, and a radio wave transmission type transfer unit formed of a material that transmits radio waves, and a wireless type attached to the article between The first radio wave reflection unit installed at a position facing the antenna so that the data carrier moves, and the installation position of the first radio wave reflection unit as a reference position, and the wavelength of the used radio wave from the reference position is (2n + 1) / The wireless data carrier attached to the article is placed at a position far from or near by a length of 4 times (n is a positive integer including 0), and at a position facing the antenna so as to move between them. The second radio wave reflector,
Furthermore, the antenna is installed at a position where a radio wave transmitted by the antenna can reach both the first radio wave reflection unit and the second radio wave reflection unit . The first radio wave reflection unit and the second radio wave reflection unit are respectively installed at positions facing the antenna so that a wireless data carrier attached to the article moves between the other side of the conveyor. The wireless data carrier writing / reading system according to claim 1 . A spacer made of a radio wave transmitting material is provided in a gap between the radio wave transmitting type transport unit and the first radio wave reflecting unit or the second radio wave reflecting unit plate, and the radio wave transmitting type transport unit is made to correspond to the dielectric constant of the radio wave transmitting material. 3. The wireless data carrier writing / reading system according to claim 1 , wherein an installation distance between the first radio wave reflection unit and the second radio wave reflection unit is shortened. 4. Conveyor having a transport unit for moving an article, a wireless data carrier, and writing / reading for writing data to the wireless data carrier attached to the article and reading data from the wireless data carrier And a wireless data carrier writing / reading system comprising an antenna and an antenna connected to the writing / reading device,
The first and second antennas are installed on the upper part of the conveyor, and the conveyor includes a radio wave transmission type transport unit formed of a material that transmits radio waves, which holds and moves the placed article, and the article is interposed between The first radio wave reflection unit installed at a position facing the first antenna so that the attached wireless data carrier moves, and the installation position of the first radio wave reflection unit is used as a reference position, and used from the reference position. The wireless data carrier attached to the article moves in a position that is far or close by a length of (2n + 1) / 4 times the wavelength of the radio wave (n is a positive integer including 0). A wireless data carrier writing / reading system comprising: a second radio wave reflection unit disposed opposite to the antenna. 5. The wireless data carrier writing / reading system according to claim 4, wherein the first and second antennas are installed on one side of the conveyor. Conveyor having a transport unit for moving an article, a wireless data carrier, and writing / reading for writing data to the wireless data carrier attached to the article and reading data from the wireless data carrier And a wireless data carrier writing / reading system comprising an antenna and an antenna connected to the writing / reading device,
The distance between the antenna installed on the upper part of the conveyor, the reflection type conveying unit made of a radio wave reflecting material and installed in parallel with the antenna, and the antenna installed on the upper part of the conveyor is the reflection type. A radio wave reflection unit provided at a position far or close by a length of (2n + 1) / 4 times the wavelength of the radio wave used (n is a positive integer including 0) with the installation position of the transport unit as a reference position; A position where a radio wave transmission type conveyance unit that transmits radio waves from the antenna is provided above the reflection unit, and a radio wave transmitted at a position above the conveyor can reach both the reflection type conveyance unit and the radio wave reflection unit A wireless data carrier writing / reading system comprising: The gap between the radio wave transmission type conveyance unit and the radio wave reflection unit is filled with a radio wave transmission material, and the distance between the reflection type conveyance unit and the radio wave reflection unit is set according to the relative dielectric constant of the radio wave transmission material. 7. The wireless data carrier writing / reading system according to claim 6, wherein the system is shortened. A reflection made of an antenna installed on the upper part of the conveyor, a radio wave transmission type carrier made of a material that transmits radio waves, holding and moving the placed article, and a radio wave reflection material holding the radio wave transmission type conveyance unit In the first and second conveyors provided with the mold holding unit, the articles are transferred across the connection ends of the first and second conveyors, and at a distance from the antenna,
Position far from the installation position of the radio wave transmission type conveyance part of the first conveyor by a length of (2n + 1) / 4 times the wavelength of the radio data carrier use radio wave (n is a positive integer including 0) or place a radio wave transmissive conveying portion of the second conveyor to close, the antenna said first conveyor and said second conveyor connecting end of the upper and transmitting radio waves said first and second conveyor A wireless data carrier writing / reading system, characterized in that the wireless data carrier writing / reading system is installed at a position where both of them can be reached. Arranged within an arbitrary width that reflects the radio wave from the antenna, the radio wave transmission type transfer unit made of a material that transmits radio waves that moves the articles placed on the conveyor, and the antenna installed on the upper part of the conveyor The distance between the plurality of reflection parts of the radio wave reflection part having the arbitrary width and the antenna is within a range of 1/4 or more times the wavelength of the radio data carrier use radio wave. The reflection of the radio wave reflection unit having the arbitrary width with respect to the transmission type transport unit so that a unique value maintaining a constant pitch is taken and the unique value is randomly arranged within the range of the arbitrary width A wireless data carrier writing / reading system characterized in that a part is installed. A reflection part of the radio wave reflection unit having the arbitrary width is installed on the radio wave transmission type transport unit so that the unique value is stepwise arranged in descending order or ascending order within the range of the arbitrary width. The wireless data carrier writing / reading system according to claim 9 . A spacer made of a radio wave transmitting material in the gap between the radio wave reflecting portion having said arbitrary width and the radio wave transmission-type transport unit is provided, and in correspondence to the relative permittivity of the radio wave transmitting material the radio wave transmission transport unit said arbitrary width 11. The wireless data carrier writing / reading system according to claim 9 or 10, wherein an installation distance of the radio wave reflection unit is shortened.

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