JP4808572B2 - Antenna for reader, article mounting shelf with antenna, and article mounting table with antenna - Google Patents

Description

  The present invention relates to a reader antenna having an antenna pattern provided on a member to be antenna-formed such as a bookshelf, a shelf board of another article placement shelf, and a base plate of an article placement table. The present invention also relates to a bookshelf with an antenna provided with a shelf plate and a base plate on which such an antenna for a reader is provided, other article mounting shelves with antennas, and an article mounting table with antennas.

  Conventionally, substantially rectangular parallelepiped articles such as documents, optical disks such as CD and DVD, other optical recording media, magnetic tapes such as video tape and audio tape, other magnetic recording media, and substantially cylindrical shapes such as bottles Various goods such as various kinds of goods such as containers, irregular-shaped clothing, or various holdings are placed on goods shelves such as display shelves, product shelves, bookshelves, document management shelves, article holding shelves, libraries, etc. Are placed on a counter stand such as a reception counter stand, an article placement stand such as a table or a desk for display, storage, management, and the like. Then, the electronic tag is attached to the various articles as described above, and the various articles as described above are managed using an RFID (Radio Frequency Identification) system including a reader / writer antenna that communicates with the electronic tag. Is expected to be. Such an electronic tag is also called a wireless tag or an IC tag, and includes an IC chip in which a memory in which information is recorded is incorporated and a communication circuit including a small antenna. As described above, the reader / writer antenna that communicates with the electronic tag is disposed along the shelf surface on which the article is placed, or the back of the article placement shelf for the purpose of preventing the article from dropping off. It is often arranged along the back plate surface arranged on the side, and is usually configured as a loop antenna.

  In recent years, application technology of an antenna system including the above-described electronic tag and reader / writer antenna has been introduced mainly in libraries. Such an applied technology attaches an electronic tag to a part of a book, and reads the electronic tag in a non-contact manner with a stationary reader / writer antenna at a reception counter such as a library, thereby It includes technology for improving the efficiency of lending and returning work, and technology for preventing books from being taken out without permission by a gate antenna as a reader / writer antenna provided at the entrance of a library or the like. In addition, the above-mentioned applied technology also includes a technique for inspecting books in a library or the like by a staff member in the library or the like scanning a book with an electronic tag placed on a bookshelf in a library or the like with a handy reader as a reader / writer. Yes. According to this inspection technology, it is necessary to take out the books one by one and scan them, which is much more efficient than the conventional method using the barcode system. The period is significantly shortened. In the text, "books" means not only books but also newspapers, magazines, materials, documents, other paper media, and documents created by binding such paper media with a binder. Also included are binding files, optical recording media such as CDs and DVDs, and magnetic recording media such as video tapes and audio tapes.

  On the other hand, in recent libraries, the mutual lending of books in each library is actively performed by networking between the libraries. Therefore, library users can borrow books that are not held by the library if they go to a nearby library. However, after using the books, the user does not always return the books to the position of the original shelf of the bookshelf. For this reason, in the scanning by the conventional handy reader as the reader / writer antenna, it is not possible to know which shelf of which shelf has the desired books. Therefore, as described above, the increase in the mutual borrowing of books in each library increases the work of searching for books requested by users from the shelf of the bookshelf every day. Therefore, library staff can manage and understand which bookshelves are placed on which shelves, and can find the desired books in a short time. There is a strong demand to be able to respond quickly to the above mutual borrowing.

As a conventional technique for dealing with the above-mentioned problems, reader / writer antennas are provided on the shelf and back plate of the bookshelf, or books on the shelf of the bookshelf using a bookend type reader / writer antenna. A bookshelf management system that manages in real time is known. For example, Patent Literature 1 discloses a bookshelf management system that manages books with an electronic tag attached to a front cover or a back cover. Further, for example, Patent Document 2 discloses interference between upper and lower shelf boards in a bookshelf having a shelf board provided with a substantially rectangular reader / writer antenna that communicates with an electronic tag attached to the back cover of books. A bookshelf management system is disclosed which is to be prevented.
JP 2003-72919 A Japanese Patent Laid-Open No. 2001-225921

  Among major libraries, many libraries attach electronic tags to the front or back cover of books. The reason is that the front cover or back cover of books has the largest area for attaching an electronic tag and is hardly affected by the size or thickness of the books. However, there are libraries that attach electronic tags to the back cover of books. Therefore, in order to borrow or borrow books among a large number of libraries, the orientation of the electronic tag attached to the books (in other words, whether the electronic tag is attached to the front cover or back cover, Regardless of whether it is attached to the back cover), the reader / writer antenna must be able to read the electronic tag attached to the books.

On the other hand, the magnetic field emitted from the reader / writer antenna is emitted not only directly above the shelf surface of the bookshelf, but also in the vertical, horizontal, and front-rear directions. For this reason, the electronic tag affixed to the books placed on another shelf board reacts by receiving the magnetic field emitted from the antenna for the reader / writer being fed on one shelf board. There is. As a result, the books placed on the other shelf board may be erroneously recognized as if they were placed on the one shelf board. Therefore, the distance between the upper and lower reader / writer antennas in the direction of magnetic field emission of the reader / writer antenna (that is, the direction perpendicular to the laying surface or shelf surface of the reader / writer antenna) (in other words, it is laid on the upper shelf plate). The distance between the reader / writer antenna and another reader / writer antenna laid on the next lower shelf so that the magnetic field does not affect each other. It is necessary to. Therefore, in the case of a conventional bookshelf to which the bookcase management system disclosed in Patent Document 1 is applied, for example, as shown in FIG. 1, a weekly magazine of A4 size (height 29.7 mm) of books 1 Even in the case of 1a or the case of the A6 size (height 14.8 mm) paperback book 1b, it is necessary to leave the space between the upper and lower shelf boards 3 to 7 of the bookshelf 2 by substantially the same. For this reason, in the case of the paperback book 1b, compared with the case of the weekly magazine 1a, since the extra space is required about twice, the storage capacity of the books 1 in the bookshelf 2 has a big problem. The structure itself excluding the portion related to the reader / writer antenna in the bookshelf 2 shown in FIG. 1 is substantially the same as that of the bookshelf 2 shown in FIG. 2, which is the first embodiment of the present invention. Therefore, for the structure itself, refer to the description below for FIG.
JP 2003-72919 A

In the reader / writer antenna disclosed in Patent Document 2, the electronic tag attached to the front cover or back cover of books cannot be read on most of the shelf boards. According to the interference prevention method for the upper and lower shelf boards disclosed in Patent Document 2, the magnetic field component in the frontage direction necessary for the electronic tag attached to the front cover or back cover of the books is greatly reduced. The Therefore, the technique of Patent Document 2 cannot be applied to an antenna for a reader / writer that reads an electronic tag attached to the front cover or the back cover of books.
Japanese Patent Laid-Open No. 2001-225921

  The present invention has been invented to solve such problems by paying attention to the above-described problems, and is attached to the front cover surface, back cover surface, back cover surface, etc. of books. The reader / writer antenna provided on the antenna formation target member for communicating with the tag can communicate with the electronic tag well without generating a useless space for an article storage space for storing articles such as books. The main purpose is to

According to the first aspect of the present invention, a reader having an antenna pattern formed on one plate surface in a state parallel to one plate surface of the pair of plate surfaces of the antenna formation target plate. In the antenna for the antenna, the first sheet-like member that has no central opening and is conductive and porous is parallel to the other plate surface of the pair of plate surfaces of the antenna forming target plate Accordingly, the outer periphery of the first sheet-like member which is provided on the other plate surface and does not have the central opening extends substantially along the outer periphery of the antenna pattern in a plan view. And a second sheet-like member that is conductive and porous is parallel to the one plate surface of the antenna forming target plate between the antenna forming target plate and the antenna pattern. the plate surface of this one The reader is provided, and the second sheet-like member has a central opening and extends in a loop shape substantially along the outer periphery of the antenna pattern as viewed in a plan view. This relates to an antenna for use. In this case, each of the first porous sheet-like member and the second porous sheet-like member may have a mesh structure in which conductive filaments are braided into a mesh shape. Further, the pitch of the small holes of the first porous sheet-like member and the second porous sheet-like member is preferably 50 to 2,000 μm (more preferably 100 to 1,200 μm). Range. In addition, the area per one of a large number of small holes in each of the first porous sheet-like member and the second porous sheet-like member is preferably 4,000 to 1,800,00 μm. ² (more preferably, 8,000 to 800,000 μm ² ). Further, the opening ratio of each of the first porous sheet-like member and the second porous sheet-like member with respect to a large number of small openings is preferably 70 to 95%. (More preferably, 80 to 92%). The distance between the first porous sheet-like member and the antenna pattern is preferably in the range of 5 to 35 mm (more preferably 8 to 30 mm). Further, the conductive pattern overlaps with the vicinity of any one of the end portions of the antenna pattern (for example, at least overlaps with a protruding portion protruding in a substantially U shape near the end portion of any one of the antenna patterns). It is preferable that the porous and third sheet-like member is provided at least at a location corresponding to the vicinity of any one of the antenna forming target plates .

In the first aspect of the present invention, the ratio of the size of the central aperture to the size of the second porous sheet-like member including a central opening, preferably 20 to 80% (more preferably 30 to 70%). In addition, the outer periphery of the second porous sheet-like member extends along the outer periphery of the antenna pattern of the reader / writer antenna or the outside thereof in a plan view, and the third porous sheet-like member. The inner periphery of the sheet-like member preferably satisfies the conditions described in the following items (a) to (d) in plan view.
(A) The inner periphery on the first side in the first direction (for example, the depth direction) of the antenna forming target plate in the inner periphery of the second porous sheet-shaped member is the first direction. Of the pattern portion extending substantially along a second direction (eg, the frontage direction) orthogonal to the pattern portion extending on the outermost periphery on the first side in the first direction. Extending substantially along or along the inner edge of the
(B) The inner periphery on the second side opposite to the first side in the first direction of the antenna forming target plate of the inner periphery of the second porous sheet-shaped member is: Of the pattern portions extending substantially along the second direction, the inner end of the pattern portion extending on the outermost periphery on the second side in the first direction or substantially on the inner side thereof. Extending along,
(C) Of the inner periphery of the second porous sheet-like member, the inner periphery on the first side in the second direction of the antenna forming target plate extends substantially along the first direction. And extending substantially along the outer edge of the pattern portion extending on the outermost periphery of the first side in the second direction in the second direction of the existing pattern portion, and ( d) The inner periphery on the second side opposite to the first side in the second direction of the antenna formation target plate of the inner periphery of the second porous sheet-shaped member is the above-mentioned Of the pattern portion extending substantially along the first direction, the outer edge of the pattern portion extending on the outermost periphery of the second side in the second direction or substantially along the outside thereof. It must be extended.

Further, in the above-described case, the second porous sheet-like member has the first direction in the pattern portion extending substantially in the second direction of the antenna formation target plate when seen in a plan view. The pattern portion extending in the vicinity of the end portion on the first side and in the vicinity of the end portion on the second side may be substantially overlapped. Further, the second porous sheet-like member may substantially overlap with all the pattern portions extending substantially along the second direction as viewed in a plan view. Further, the second porous sheet-like member may not substantially overlap any pattern portion extending substantially along the first direction as viewed in a plan view.

In the first aspect of the present invention, the first and second loop antennas respectively provided on the antenna forming target plate in a state where the reader antennas are insulated from each other and overlapped with each other. It is preferable to provide. Each of the first and second loop antennas includes a substantially loop-shaped antenna pattern, and the substantially loop-shaped antenna pattern of the first loop antenna and the substantially loop-shaped antenna pattern of the second loop antenna. Each of the shape antenna patterns is orthogonal to the first pattern portion provided on the first side in the first direction of the antenna formation target plate and the first direction of the antenna formation target plate. The second pattern portion provided on the first side in the second direction and the second pattern portion provided on the second side opposite to the first side in the first direction of the antenna formation target plate . a third pattern portion, and the first side in the second direction of the antenna forming target plate and a fourth pattern portion provided on a second side of the opposite side, the Each of the third pattern portion of one loop antenna and the first pattern portion of the second loop antenna includes a plurality of baseline portions that are intermittently arranged with each other, and a plurality of these baseline portions. Each having at least one bent portion provided between the base line portions, and each of the bent portions is configured to have a substantially convex shape including a first rising portion and a second rising portion, respectively. The first rising portion or the second rising portion of the first loop antenna is between the first rising portion corresponding to the first rising portion of the second loop antenna and the second rising portion corresponding to the first rising portion. It is preferable that the first loop antenna is displaced in the second direction with respect to the second loop antenna. In this case, the first loop antenna is preferably 0.25 to 0.75 (more preferably 0.3 to 0.00) of an average length per one of the plurality of baseline portions. 6) is shifted in the second direction with respect to the second loop antenna by the range of 6). Further, the first loop antenna is preferably per one of the first and second rising portions of the first loop antenna and the first and second rising portions of the second loop antenna. Are shifted in the first direction with respect to the second loop antenna by an average length of 0.05 to 0.5 (more preferably, 0.1 to 0.4). Further, the reader antenna is preferably configured as a reader / writer antenna.

Further, according to the second aspect of the present invention, there is provided an article with antenna, characterized in that a shelf board on which the reader antenna according to the first aspect is formed is provided as the antenna formation target board. It relates to the shelf. In this case, it is preferable that the article mounting shelf with an antenna is a bookshelf with an antenna. Further, at least one of the shelf boards (preferably, all the shelf boards excluding the shelf board that also serves as a bottom board as needed) is configured to change the mounting position in the vertical direction. It is preferable. According to a third aspect of the present invention, there is provided an antenna-equipped article, comprising a base plate on which the reader antenna according to the first aspect is formed as the antenna formation target plate. It is related to the table.

According to the present invention, an unnecessarily large magnetic field (magnetic flux) generated by a predetermined antenna component of the antenna pattern of the reader antenna is generated by a conductive and porous first sheet-like member by using a shelf board or the like. (specifically, the upper portion other than the fixed distance above the upper portion and the antenna formation target plate antenna forming target plate) external antenna forming target plate can be so weakened by the considerable extent only Therefore, there is almost no possibility of interference between the reader antenna and another reader antenna adjacent to the reader antenna in the vertical and horizontal directions, and a wasteful space is generated in the article storage space. There is nothing. Nevertheless, since the conductive first sheet-like member is porous, the magnetic field (magnetic flux) generated by the antenna pattern of the reader antenna functions effectively for mutual communication with the electronic tag. Therefore, despite the relatively simple configuration, the reader antenna can communicate with the electronic tag well.

Moreover, according to the invention which concerns on Claims 1-12 , the magnetic field (magnetic flux) larger than needed generated by the predetermined antenna component of the antenna pattern of the antenna for readers is made into the 2nd porous sheet-like member. also, since it is possible to weaken further only to the outside of the antenna forming target plate such as shelves, an antenna for the reader, this and the vertical direction, the antenna for a different leader adjacent to each other in such a horizontal direction Is less likely to cause interference.

Further, according to the invention of claim 7 , a magnetic field (magnetic flux) larger than necessary generated by a predetermined antenna component of the antenna pattern of the reader antenna can be generated by the third porous sheet-like member. since it is possible to weaken further only to the outside of the antenna forming target plate such as a shelf board, between the antenna the reader, which the vertical direction, the other reader antenna adjacent the like horizontally The possibility of causing interference is further reduced.

According to the fourteenth aspect of the present invention, the incommunicable region extending substantially along the first direction of each of the first and second antennas is relatively simple with a relatively small number of antennas. The antenna pattern shape can complement each other. For this reason, it is possible to communicate with electronic tags in various directions (for example, electronic tags attached to the front cover or back cover of books, or electronic tags attached to the back cover of books). The reader antenna can be provided.

According to the fifteenth aspect of the present invention, since both writing to the electronic tag and reading from the electronic tag can be performed with a common antenna, the configuration of the entire reader / writer can be simplified. .

Further, according to the inventions according to claims 16 and 19 , there is almost no possibility of causing interference between the reader antenna and another reader antenna adjacent thereto in the vertical direction, the horizontal direction, etc. Such as a bookshelf equipped with a reader antenna that can communicate well with an electronic tag even though the reader antenna can be made relatively simple without causing a large space. An article placement shelf and an article placement table can be provided.

Furthermore, according to the invention which concerns on Claim 18 , the top part (the top in the case of books) of the article | item with the largest size of the height among the articles | goods mounted on the said at least 1 shelf board, and The gap between the top of the article storage space on the at least one shelf board (for example, the lower surface of the upper shelf board) is always set to a substantially constant interval (for example, 10 mm or more). be able to. Therefore, in the case of a shelf board on which only articles having a relatively small height such as a paperback book are placed, the height size of the article storage space can be made as small as possible.

  Next, the first and second embodiments in which the present invention is applied to the bookshelf management system are respectively referred to as “1, first embodiment”, “2, second embodiment”, “3, third embodiment”. Examples will be divided into “Example”, “4, Fourth Example”, and “5, Operation Experiment of Reader / Writer Antenna”, respectively, and will be described with reference to the drawings.

1. First Embodiment First, the first embodiment of the present invention is described in “(1) Schematic configuration of entire bookcase”, “(2) Shelf plate with antenna for reader / writer”, “(3) Reader / writer” The antenna antenna pattern shape, "(4) interference prevention member" and "(5) power supply method to the reader / writer antenna" will be described with reference to FIGS.

(1) Schematic configuration of entire bookcase The bookcase 2 according to the first embodiment of the present invention has a shelf 2 shown in FIG. As shown, the upper and lower shelf boards 3 to 8 are provided. Specifically, the bookshelf 2 includes the uppermost shelf 3, the second shelf 4, the third shelf 5, the fourth shelf 6, the fifth shelf 7, and the bottom plate. The lowermost shelf plate 8 is provided. These shelf boards 3-8 can each be comprised by making a suitable nonmetallic material (in other words, transparent or opaque nonconductor), such as wood, a synthetic resin, and glass, as a main component. Further, as shown in FIG. 2, the bookshelf 2 is substantially a box made up of a left side plate 11, a right side plate 12, a back plate 13, a top plate 14 and a bottom plate 8 also serving as a bottom shelf. It has a lid shape (in other words, a substantially rectangular parallelepiped shape). The pair of left and right side plates 11 and 12, the back plate 13 and the top plate 14 can also be made of an appropriate material such as wood, synthetic resin or glass. The bookshelf 2 may further include a front plate (not shown) that is preferably made of glass, synthetic resin, or the like, and the front plate is, for example, a pair of left and right sliding door structures. It may be.

  The shelves 3 to 7 are formed of a pair of left and right side edges and / or a side edge on the back board 13 side by a pair of right and left side boards 11 and 12 and / or a back board by an appropriate shelf board support (not shown). 13 can be supported. The shelf supporter can be configured separately from the pair of left and right side plates 11, 12 and / or the back plate 13, and is detachable from the pair of left and right side plates 11, 12 and / or the back plate 13. And it may be respectively attached so that the attachment position in the up-down direction can be changed continuously or stepwise. Moreover, the said shelf board support may be comprised integrally with the shelf boards 3-7, and may be comprised separately so that these shelf boards 3-7 may be supported. For this reason, the shelf boards 3-7 can change the attachment position in an up-down direction between the top plate 14 and the bottom plate 8 continuously or in steps. Therefore, the interval between the shelves 3 to 7, the interval between the top plate 14 and the uppermost shelf 3, and the interval between the fifth shelf 7 and the bottom shelf 8 that also serves as the lowermost shelf are continuous. Can be changed in or step by step. Reader / writer antennas 15 shown in FIGS. 3 and 4 are laid on each of the shelves 3 to 8 of the bookshelf 2 shown in FIG. 2 so as to be substantially parallel to the shelf surface. The first and second antennas A and B of the reader / writer antenna 15 pass through a matching adjuster (not shown) and then are connected to an antenna switch (not shown) by a coaxial cable (not shown). )It is connected to the. The antenna switcher is sequentially connected to a reader / writer body (not shown) and a control computer (not shown) by a coaxial cable (not shown). This reader / writer main body is for exchanging information such as electric signals with the reader / writer antenna 15. The reader / writer main body can be arranged on the bookshelf 2, for example, may be arranged on the top plate 14 of the bookshelf 2. Further, the antenna switch can be similarly arranged on the bookshelf 2 as required.

  Books 1 of various sizes are mixedly loaded on the shelf boards 3 to 8 of the bookshelf 2 shown in FIG. These books 1 are each provided with an electronic tag 16 which may be in the form of a sheet, as shown in FIGS. 5A and 5B. The electronic tag 16 is attached to the front cover 17 or the back cover 18 of the books 1 in one example shown in FIG. 5A, and is attached to the back cover 19 in another example shown in FIG. 5B. Yes. In any of these cases, the electronic tag 16 is affixed to the outer surface of the covers 17 to 19 in the illustrated embodiment, but may be affixed to the inner side of the book cover, etc. There is no particular need to be in a specific position or a specific orientation with respect to the surfaces of the shelf boards 3-8. As shown in FIG. 6, the electronic tag 16 shown in FIG. 5A has a single-turn or multiple-turn, small loop-shaped antenna 21 whose center substantially coincides with the center of the electronic tag 16, and information is stored in the electronic tag 16. There may be provided a communication circuit including a memory (not shown) to be recorded and an IC chip 22 disposed in the central opening of the small loop-shaped antenna 21. The electronic tag 16 shown in FIG. 5B is substantially the same as the electronic tag 16 shown in FIG. 5A except that the electronic tag 16 shown in FIG. It may be a configuration.

(2) Shelf with antenna for reader / writer Each shelf 3 to 8 of the rack 2 shown in FIGS. 2 and 3 has, for example, a length L ₁ (see FIG. 3) in the frontage direction x of about 850 mm and a depth direction y The length L ₂ (see FIG. 3) may be a substantially rectangular shape having a lateral length of about 170 mm. As shown in FIGS. 3 and 4, each shelf board 3 to 8 is provided with a reader / writer antenna 15 including first and second loop antennas A and B. FIG. 3 is a plan view of, for example, the third-stage shelf board 5 that projects both the first and second loop antennas A and B and shows them. Each of the shelf plates 3, 4, 6 to 8 other than the shelf plate 5 may be provided with a reader / writer antenna 15 substantially the same as the shelf plate 5 shown in FIGS. 3 and 4. Also, a reader / writer antenna 15 may be provided in which one or both of the second loop antennas A and B are different from the case of the shelf board 5. In FIG. 3 and all the drawings similar to this (including the case of the second embodiment described later), for convenience of illustration, the first loop antenna A is indicated by a solid line, and the second loop antenna. B is indicated by a broken line. Further, the width of each pattern portion of the antenna patterns 23 of the first and second loop antennas A and B is also shown to be thicker than the actual for convenience of illustration. Furthermore, the actual widths of the pattern portions of the antenna patterns 23 of the first and second loop antennas A and B may be substantially the same as each other.

The first and second loop antennas A and B of the reader / writer antenna 15 (specifically, both the substantially loop-shaped antenna pattern 23 and the pair of terminal portions 24a and 24b shown in FIGS. 3 and 7) 4 and 8, conductive paint (for example, silver paste) is printed and fired in a width of about 5 mm, for example, on a substrate 25 made of a suitable non-metallic material such as wood, synthetic resin, or glass, respectively. It may have been. In this case, between the first and second loop antennas A and B, as shown in FIGS. 4 and 8, the non-conductive film such as PVB resin and the thickness L ₃ (see FIGS. 4 and 8). Can be interposed, for example, which can be about 300 μm. The first and second loop antennas A and B may be made of copper wire having a substantially circular cross-sectional shape and a cross-sectional diameter of 0.1 mm. In this case, the copper wire may be mounted and arranged by being bent into a predetermined pattern shape and then partially or entirely bonded to the substrate 25 with an appropriate adhesive. Furthermore, as described above, the pair of terminal portions 24a and 24b of the first and second loop antennas A and B are composed of a conductive pattern configured by printing and baking a conductive paint. The substantially loop-shaped antenna pattern 23 may be made of a copper wire as described above. In this case, both end portions of the antenna pattern 23 may be electrically connected to the pair of terminal portions 24a and 24b by bonding with an appropriate conductive adhesive, soldering, or the like. Moreover, the board | substrate 25 may be a wooden board about 15 mm thick, for example. The material constituting the first and second loop antennas A and B is not necessarily a conductive paint, but a conductive film, a conductive metal foil, a metal wire such as a copper wire as described above, and other wires. A conducting wire may be used. Furthermore, in the illustrated embodiment, as shown in FIG. 4, the first and second loop antennas A and B are formed on the upper surface of the substrate 25 of each of the shelf plates 3 to 8. In order to reduce the chance of contact with the books 1 arranged on -8, a coating film made of a suitable insulating material on the upper surface of each shelf plate 3-8 including the first and second loop antennas A, B 27 can be coated.

(3) Pattern Shape of Reader / Writer Antenna The reader / writer antenna 15 for communicating with the electronic tag 16 provided in the books 1 by wireless communication is as shown in FIG. 3, FIG. 4, FIG. 7, and FIG. In addition, the first loop antenna A and the second loop antenna B are included. Each of the first and second loop antennas A and B includes a substantially loop-shaped antenna pattern 23 and a pair of terminals that are connected to both ends of the substantially loop-shaped antenna pattern 23 and are close to each other. It consists of parts 24a and 24b. Since the gap 31 is provided between the pair of terminal portions 24a and 24b, the gap 31 is similarly present between both ends of the substantially loop-shaped antenna pattern 23. The pair of terminal portions 24a and 24b may be connected to the matching adjuster (not shown) by a twist cable (not shown).

  The substantially loop-shaped antenna patterns 23 of the first and second loop antennas A and B constituting the reader / writer antenna 15 shown in FIGS. 3, 4, 7 and 8 are shown in FIGS. As shown in FIG. 7, they may be substantially the same shape as each other or substantially similar to each other except that they are symmetrical in the longitudinal direction. The substantially loop-shaped antenna pattern 23 of each of the first and second loop antennas A and B is provided with a terminal portion 24a for feeding and the like as necessary, and on the rear edge portion 32 side of the shelf board 5. The first pattern portion 33 that is positioned, the second pattern portion 35 that is positioned on the side of the left edge 34 toward the shelf 5, and the front edge of the shelf 5 (in other words, the books 1 The third pattern portion 37 located on the side of the take-out side 36) and the terminal portions 24a and / or 24b for power feeding or the like are connected as necessary, and the right edge portion toward the shelf 5 The fourth pattern portion 39 located on the side of the plate 38 may be successively connected, and as a whole, it is configured in a loop shape except for the gap 31 corresponding to the pair of terminal portions 24a and 24b. May have been. Each of the first and second loop antennas A and B is preferably a one-loop antenna that does not have an intersecting portion where a part thereof intersects another part. In the present text, the above “intersection” does not electrically connect, but intersects in a projection view of the antenna forming target member such as the shelf board 5 from the upper surface (in other words, in plan view). It means that

  As shown in FIGS. 3 and 7, the first pattern portion 33 of the first loop antenna A is slightly separated from the rear edge portion 32 of the shelf board 5 and substantially parallel to the rear edge portion 32 (in other words, For example, it is in a state of being substantially parallel to the opening direction x of the shelf board 5, and in the illustrated embodiment, extends substantially over the entire length in the opening direction x of the shelf board 5 with substantially straight line-hereinafter the same). Yes. The second pattern portion 35 of each of the first and second loop antennas A and B is close to the left side edge 34 toward the shelf plate 5 or a certain distance from the left side edge 34 and substantially parallel to the left side edge 34. Each extends in a state (in other words, in a state substantially parallel to the depth direction y of the shelf board 5 and in the illustrated embodiment, substantially linear—the same applies hereinafter). The third pattern portion 37 of the second loop antenna B is close to the front edge portion 36 of the shelf board 5 and substantially parallel to the front edge portion 36 (in other words, in the opening direction x of the shelf board 5). In a substantially parallel state), the shelf plate 5 extends over substantially the entire length in the opening direction x. The fourth pattern portion 39 of each of the first and second loop antennas A and B has a gap between the portion on the rear end portion 32 side or the middle portion in the front-rear direction for connection of the terminal portions 24a and / or 24b. Except for being interrupted by 31, a state of being somewhat away from the right edge 38 toward the shelf 5 and slightly parallel to the right edge 38 (in other words, the depth direction of the shelf 5 in a state substantially parallel to y).

  The third pattern portion 37 of the first loop antenna A is in a state slightly apart from the front edge portion 36 of the shelf board 5 and substantially parallel to the front edge portion 36 (in other words, in the opening direction x of the shelf board 5). (In a substantially parallel state) a plurality of (5 in the illustrated embodiment) baseline portions 42 intermittently extending so that an intermittent portion 41 is generated between them, and these intermittently extended portions. One or a plurality (preferably a plurality, preferably 4) extending between the plurality of existing baseline portions 42 (in other words, the intermittent portion 41). ) Bent portions 43. Each baseline portion 42 is a virtual center line (hereinafter referred to as “antenna center line”) of the reader / writer antenna 15 extending in the opening direction x of the shelf 5 along the center of the reader / writer antenna 15 in the depth direction y. That is, the rear edge 32 side of the third pattern portion 37 of the second loop antenna B extends on the front edge 36 side of 44. The first pattern portion 33 of the second loop antenna B is separated from the rear edge portion 32 of the shelf board 5 to some extent and substantially parallel to the rear edge portion 32 (in other words, the direction of the front edge of the shelf board 5). (in a state substantially parallel to x), a plurality of (5 in the illustrated embodiment) baseline portions 42 intermittently extending so that an intermittent portion 41 is generated therebetween, and these intermittent portions. One or a plurality (preferably a plurality of, preferably a plurality of) are present between the plurality of baseline portions 42 (in other words, the intermittent portion 41) in the illustrated embodiment. 4) bent portions 43. Each base line portion 42 extends on the front edge portion 36 side of the first pattern portion 33 of the first loop antenna A on the rear edge portion 32 side of the antenna center line 44. In the illustrated embodiment, the virtual center line of the shelf 5 that extends in the frontage direction x of the shelf 5 along the center line in the depth direction y of the shelf 5 (that is, the shelf center line) is The antenna center line 44 substantially coincides with the antenna center line 44.

  As shown in FIGS. 3 and 7, each bent portion 43 of the first loop antenna A has a base end portion connected to the right end portion of the left base line portion 42 and a shelf plate. 5, a first rising portion 45 rising substantially toward the rear edge portion 32, and a base plate portion connected to the left end portion of the right base line portion 42, and a shelf plate 5 substantially parallel to the frontage direction x so as to connect the second rising portion 46 rising substantially toward the rear edge portion 32 and the leading ends of the first and second rising portions 45 and 46, respectively. It is preferable that the connecting portion 47 extends and is a substantially rectangular convex portion as a whole. In this case, the connecting portion 47 is substantially on the front edge portion 36 side of the first pattern portion 33 of the first loop antenna A on the side of the rear edge portion 32 of the shelf board 5 from the antenna center line 44 in the frontage direction x. It is preferred that they extend in parallel. Therefore, the first and second rising portions 45 and 46 are separated from one side of the shelf plate 5 (specifically, the portion on the front edge portion 36 side of the shelf plate 5) divided into two by the antenna center line 44. It is preferable to extend so as to be substantially orthogonal to the antenna center line 44 up to the side (specifically, the portion on the rear edge portion 32 side of the shelf board 5).

  As shown in FIGS. 3 and 7, each bent portion 43 of the second loop antenna B has a base end portion connected to the right end portion of the left base line portion 42 and a shelf plate. 5, the first rising portion 45 rising substantially toward the front edge portion 36, and the base end portion of the right side toward the right base line portion 42. Extending substantially parallel to the frontage direction x so as to connect the second rising portion 46 rising substantially toward the front edge portion 36 and the tips of the first and second rising portions 45 and 46, respectively. It is preferable that it is a substantially rectangular convex portion as a whole. In this case, the connecting portion 47 is substantially closer to the rear edge portion 32 side of the third pattern portion 37 of the second loop antenna B on the side of the front edge portion 36 of the shelf board 5 than the antenna center line 44 in the frontage direction x. It is preferred that they extend in parallel. Therefore, the first and second rising portions 45 and 46 are separated from one side of the shelf 5 (specifically, the portion on the rear edge portion 32 side of the shelf 5) divided into two by the antenna center line 44. It is preferable to extend so as to be substantially orthogonal to the antenna center line 44 up to the side (specifically, the portion on the front edge 36 side of the shelf board 5).

  The reader / writer antenna 15 is a combination of the first loop antenna A and the second loop antenna B, as shown in FIGS. The second loop antenna B is substantially a loop that is substantially the same as the substantially loop-shaped antenna pattern 23 of the first loop antenna A, except that the second loop antenna B is symmetrical with respect to the antenna center line 44 as an axis of symmetry. The antenna pattern 31 has a shape, and only the position of the pair of terminal portions 24a and 24b is different from the first loop antenna A. Therefore, the first loop antenna A and the second loop antenna B as a whole have antenna pattern shapes that are substantially the same or substantially similar to each other.

The reader / writer antenna 15 is configured by arranging the first and second loop antennas A and B in combination with each other as shown in FIGS. In this combination, the second loop antenna B is approximately ½ of the distance L ₄ (see FIG. 7) corresponding to the length of the connecting portion 47 in the frontage direction x with respect to the first loop antenna A (see FIG. 7). That is, the length of the first or second rising portion 45, 46 in the depth direction y is approximately 0.5L ₄ and is shifted to the right by about 45 mm in the illustrated embodiment. The distance L ₅ (see FIG. 7) corresponding to is approximately 1/8 (ie, approximately 0.125L ₅ and approximately 15 mm in the illustrated embodiment).

(4) Interference prevention member A conductive and porous sheet-like member 51 as a shielding material (in other words, an interference prevention member) is attached to the lower surface of the shelf board 5 without the shielding material shown in FIGS. By this, the shelf board 5 with a shielding material shown in FIG. 3 and FIG. 4 can be manufactured. Such attachment can be achieved by, for example, partially or totally adhering the conductive porous sheet-like member 51 to the lower surface of the substrate 25 of the shelf board 5 without shielding material with a suitable adhesive. Can do. In this case, as shown in FIG. 4, the lower surface of the porous sheet-like member 51 bonded to the lower surface of the substrate 25 of the shelf board 5 can be covered with a coating film 52 made of a suitable insulating material. Such a coating film 52 may be a film made of a suitable non-conductive material such as PET (polyethylene terephthalate), and is previously bonded to one or both surfaces of the porous sheet-like member 51. It's okay. In FIG. 3 and all the drawings similar to this (including the case of the second embodiment described later), the porous sheet-like member 51 is indicated by a one-dot chain line for convenience of illustration. The length in the frontage direction x of the porous sheet-like member 51 is, for example, _(in other words, 850 mm) length L ₁ in the frontage direction x of the shelf plate 5 and may be substantially identical. Moreover, the length of the porous sheet-like member 51 in the depth direction y may be substantially the same as the length L ₂ (in other words, 170 mm) of the shelf board 5 in the depth direction y, for example.

  As shown in FIG. 3, the outer peripheral shape of the porous sheet-like member 51 may be a substantially rectangular shape, and the outer periphery of the reader / writer antenna 15 may be made slightly larger. Therefore, the porous sheet-like member 51 covers almost the entire pattern portion of the reader / writer antenna 15 (particularly, the substantially loop-shaped antenna pattern 23), and overlaps with the almost all pattern portion. have. In the present text, the term “overlap” does not electrically connect and overlap, but overlaps in a projection view (in other words, in plan view) of the antenna forming target member such as the shelf board 5 as viewed from above. It means that In the illustrated embodiment, the distance between the porous sheet-like member 51 and the second loop antenna B (particularly, the antenna pattern 31) is substantially equal to the thickness of the substrate 25 as shown in FIG. Equally about 15 mm. Also, as shown in FIG. 4, the distance between the porous sheet-like member 51 and the first loop antenna A (particularly, the antenna pattern 31) is the thickness of the substrate 25 (about 15 mm), the second antenna. The sum of the thickness of the pattern B and the thickness of the intermediate film 26 (about 300 μm) is about 16 mm.

In the first embodiment, the conductive and porous sheet-like member 51 may have a mesh structure in which conductive filaments such as metal wires are braided into a mesh shape. In the illustrated embodiment, the porous sheet-like member 51 is composed of a metal mesh in which a large number of vertical lines and a large number of horizontal lines each composed of a metal wire such as a copper wire and an iron wire are knitted in a grid pattern. Has been. The wire diameter of the metal wire may be about 20 μm, for example, and the mesh pitch of the metal mesh may be about 300 μm, for example. Therefore, each of the vertical and horizontal lengths of the small holes (ie, the through holes) corresponding to one grid face may be, for example, about 280 μm. For this reason, the porous sheet-like member 51 The maximum length of each small aperture may be, for example, about 396 μm, the area per one of the small apertures may be, for example, about 78,400 μm ² , and the aperture ratio of the porous sheet-like member 51 is For example, it may be about 87%. Further, in the second mode, the conductive porous sheet-like member 51 has a large number of small openings on a conductive thin plate such as stainless steel or other metal thin plate as in the case of the mesh structure. It may be a thin plate having a micromesh structure such as a micromesh metal in which holes (that is, through-holes) are formed. In any of the first and second aspects, the conductive and porous sheet-like member 51 may be made of a magnetic material or a non-magnetic material. Further, in any of the first and second aspects, the small holes formed in the porous sheet-like member 51 are substantially square, substantially rectangular, substantially rhombus, substantially trapezoidal, substantially hexagonal, The shape may be a substantially circular shape, a substantially oval shape, a substantially oval shape, a shape formed by combining any number of these shapes, or any other shape. Note that the sheet resistance of the metal mesh 51 made of copper wire may be, for example, about 0.18Ω / □, but in the present invention, in general, from the viewpoint of practicality, the metal mesh 51 is generally used. The sheet resistance is preferably 0.5Ω / □ or less, and more preferably 0.3Ω / □ or less. Further, these preferable numerical ranges and more preferable numerical ranges also apply to the porous sheet-like member 51 having the micromesh structure.

In any of the first and second aspects (in other words, in the present invention), the porous sheet-like member 51 is generally the following (a) to ( It is preferable that one, a plurality, or all of the numerical ranges described in the item (f) are satisfied. The numerical ranges in parentheses described in the following items (a) to (f) are more preferable numerical ranges that are satisfied in the present invention.
(A) The distance between the porous sheet-like member 51 and the first loop antenna A (particularly, the antenna pattern 23) and the porous sheet-like member 51 and the second loop antenna B (particularly, the antenna pattern 23). ) (In other words, the mutual distance between the porous sheet-like member 51 and the reader / writer antenna 15 (particularly, the antenna pattern 23)): a range of 5 to 35 mm (8 to 30 mm) ,
(I) The maximum line width of the conductive filaments of the porous sheet-like member 51 when the porous sheet-like member 51 is a braided conductive filament (if the cross section is substantially circular) , Wire diameter): in the range of 4 to 200 μm (8 to 100 μm),
(C) Pitch of small openings of the porous sheet-like member 51 (specifically, when the sheet-like member 51 is a braided conductive strip formed in a mesh shape, the mesh pitch): 50 to 2,000 μm (100 to 1,200 μm) range,
(D) Maximum length of each small aperture of the porous sheet-like member 51: a range of 60 to 3,000 μm (120 to 1,600 μm),
(E) Area per one of a large number of small openings in the porous sheet-like member 51: a range of 4,000 to 1,800,000 μm ² (8,000 to 800,000 μm ² ), and (f) The aperture ratio of the porous sheet-like member 51 (in other words, the aperture ratio for a large number of small apertures of the sheet-like member 51): in the range of 70 to 95% (80 to 92%).

In the embodiment shown in FIGS. 3 and 4, the conductive and porous sheet-like member 51 does not have an opening portion such as a central opening and a cut in addition to the large number of small openings. The porous sheet-like member 51 has a substantially rectangular shape, a substantially square shape, a substantially rhombus shape, a substantially trapezoidal shape, a substantially rectangular shape, a substantially oval shape, a substantially elliptical shape, a strip shape such as a substantially circular shape, and colored paper. The shape may be any other shape. Further, in the illustrated embodiment shown in FIG. 3, the covering portion (in other words, the overlapping portion) where the porous sheet-like member 51 covers the reader / writer antenna 15 from the lower surface side of the shelf board 5 is used. , As described in the following items (ki) to (su). In the present invention, from the viewpoint of practicality, one, a plurality, or all of the antenna portions described in the following (ki) to (su) are generally porous. It is preferably covered with the sheet-like member 51.
(G) the first pattern portion 33 of the first loop antenna A and the third pattern portion 37 of the second loop antenna B;
(H) Base line portions 42 of the first and second loop antennas A and B,
(K) The connecting portions 47 of the first and second loop antennas A and B,
(E) a second pattern portion 35 of each of the first and second loop antennas A and B (in other words, front and rear end portions thereof and an intermediate portion between these front and rear end portions),
(S) The fourth pattern portion 39 of each of the first and second loop antennas A and B (in other words, the front and rear end portions thereof and the intermediate portion between the front and rear end portions),
(G) The first and second rising portions 45 and 46 of the first and second loop antennas A and B (in other words, the front and rear end portions thereof and the intermediate portion between the front and rear end portions) And (su) a pair of terminal portions 24a and 24b of the first and second loop antennas A and B, respectively.

  As described above, in the reader / writer antenna 15, the partially strong magnetic field (magnetic flux) generated by the antenna pattern 23 of each of the first and second loop antennas A and B is a porous sheet. The member 51 is weakened to a considerable extent. For this purpose, the reader / writer antenna 15 of, for example, the shelf board 5 of the shelf 2 shown in FIG. 2 is arranged on the upper and lower shelf boards 4 and 6 or another similar bookshelf arranged adjacent to the left or right side thereof. There is little possibility of interference between the shelf boards and the reader / writer antennas of other similar bookshelf shelves arranged back to back. Therefore, there is no need to make the interval between the shelves 3 to 8 relatively large as in the case of the conventional bookshelf 2 shown in FIG. And it is possible to make the space | interval of the top 20 of the books 1 and the shelf boards 3-7 immediately above it substantially constant irrespective of the size of the books 1 in particular. Therefore, in the case of the shelf 6 on which only the A6 size paperback book 1b is placed, the distance from the upper shelf 5 is compared with the case of the shelf 4 on which only the A4 size weekly magazine 1a is placed. It can be made sufficiently small. As a result, since no extra space is required on the shelf 6 on which only the A6 size paperback book 1b is placed, the same size as the conventional bookshelf 2 having the five-tier shelf 3-7 as shown in FIG. However, in the case of the embodiment of the present invention shown in FIG. 2, the number of the shelves 3 to 8 of the bookshelf 2 can be increased to six stages. For this reason, in the case of the bookshelf 2 shown in FIG. Compared with the bookshelf 2 shown in FIG. 1, more books 1 can be accommodated. Nevertheless, the antenna components extending along the depth direction y of the respective antenna patterns 23 of the first and second loop antennas A and B (that is, as described in the items (ko) to (shi) above) Magnetic fields (magnetic fluxes) generated by the antenna components 35, 39, 45, and 46) communicate with each other between the electronic tag 16 attached to the front cover 17 and the back cover 18 of the books 1 and the reader / writer antenna 15. It works effectively. Moreover, the antenna component (namely, said (ki) term-(ke) term | claim) extended substantially along the frontage direction x of each antenna pattern 23 of 1st and 2nd loop antenna A, B. Magnetic fields generated by the antenna components 33, 37, 42, 47) function effectively for mutual communication between the electronic tag 16 attached to the spine 19 of the books 1 and the reader / writer antenna 15. For this reason, even when the books 1 are lent to each other among a large number of libraries in which the attachment positions of the electronic tags 16 to the books 1 are different from each other, such a mutual loan should be sufficiently handled. Can do.

(5) Feeding method of reader / writer antenna By feeding power to one of the first and second loop antennas A and B, the induced current generated in the other loop antenna is unidirectional (in other words, Therefore, both the first and second loop antennas A and B of the reader / writer antenna 15 can communicate with the electronic tag 16 only by supplying power to only one loop antenna. However, by alternately supplying power to the first and second loop antennas A and B, both the first and second loop antennas A and B of the reader / writer antenna 15 can be connected to the electronic tag 16 in a more stable state. Good communication can be achieved.

2. Second Embodiment In the bookshelf 2 in the second embodiment shown in FIGS. 9 and 10, as the interference preventing member (in other words, a shielding material) provided on the shelves 3 to 8, FIG. As in the case of the first embodiment shown in FIG. 4, substantially the entire bottom surfaces of the shelf boards 3 to 8 (in other words, almost the entire antenna patterns 23 of the first and second loop antennas A and B) are covered. In addition to the conductive and porous first sheet-like member 51, a conductive and porous second sheet-like member 53 having a relatively small shape is provided. The bookshelf 2 in the second embodiment shown in FIG. 9 and FIG. 10 may have substantially the same configuration as the bookshelf 2 in the first embodiment described above, except as described below. The books 1 in the second embodiment may have substantially the same configuration as the books 1 in the first embodiment described above. Therefore, in FIG. 9 and FIG. 10, the same code | symbol is attached | subjected to FIG. 1-8 and a common part, and the description is abbreviate | omitted as needed. In the following description, only the third shelf 5 will be described, but the remaining shelves 3, 4, 6 to 8 have substantially the same configuration as the shelf 5 as necessary. It may be a different configuration.

  In the shelf board 5 shown in FIG. 9 and FIG. 10, a second porous sheet-like member 53 is provided as an interference preventing member (in other words, a shielding material) separately from the first porous sheet-like member 51. Is provided. Such a second porous sheet-like member 53 is described in the section 1 (2) on the lower surface of the second loop antenna B (in other words, the upper surface side of the substrate 25), as shown in FIG. It can be attached, for example, by bonding using a second intermediate film 54 which may be similar to the intermediate film 26. In FIG. 9, the second porous sheet-like member 53 is indicated by a two-dot chain line for convenience of illustration.

  The second porous sheet-like member 53 has a rectangular shape such as a substantially rectangular shape, a substantially square shape, a substantially rhombus shape, a substantially trapezoidal shape, a substantially oval shape, a substantially oval shape, or a substantially circular shape. It may be a colored paper shape or any other shape. In the illustrated embodiment, the second porous sheet-like member 53 is formed in a substantially rectangular shape as shown in FIG. The length of the second porous sheet-like member 53 in the depth direction y is, for example, the length of the first porous sheet-like member 51 in the depth direction y (in other words, the depth direction y of the shelf board 5). The length in (i.e., about 170 mm) may be substantially the same. In addition, the length (in other words, the width) in the opening direction x of the second porous sheet-like member 53 may be about 55 mm, for example.

  The second porous sheet-like member 53 has a left end thereof shifted from the left end toward the first porous sheet-like member 51 to the right by, for example, about 10 mm, and a front end and a rear end thereof. The first porous sheet-like member 51 may overlap with the first porous sheet-like member 51 through the second intermediate film 54 so that the portions substantially coincide with the front end portion and the rear end portion of the first porous sheet-like member 51, respectively. . Such a second intermediate film 54 may be a film made of a suitable non-conductive material such as PET, and may be bonded in advance to one or both surfaces of the second porous sheet-like member 53. . In other words, the second porous sheet-like member 53 has its left end portion shifted to the right side from the left end portion toward the first porous sheet-like member 51 by, for example, about 10 mm. Therefore, the second porous sheet-like member 53 includes, as shown in FIG. 9, the second pattern portion 35 of the first loop antenna A and the first pattern portion 33 of the first loop antenna A. Of the left side of the first loop antenna A and a left half of the first loop antenna A toward the leftmost baseline portion 42, and protrudes in a substantially U shape in the vicinity of the left edge 34. And overlaps with the protruding portion on the left side, and also overlaps with the second pattern portion 35 of the second loop antenna B. In other words, the second porous sheet-like member 53 at least partially overlaps with the vicinity of the left end portion of the first porous sheet-like member 51. Further, the second porous sheet-like member 53 may be of the same material and composition as the first porous sheet-like member 51 described in the above section 1 (4). And the 2nd porous sheet-like member 53 is generally said from the viewpoint of practical use, the said (a)-() which described the 1st porous sheet-like member 51 in said 1 (4) term. It is preferable that one, a plurality, or all of the numerical ranges that are the same as the numerical ranges described in the item (f) (including more preferable numerical ranges) are satisfied. Further, as shown in FIGS. 9 and 10, the second porous sheet-like member 51 preferably does not have an opening portion such as a central opening or a cut in addition to a large number of small openings.

  As described above, in the reader / writer antenna 15 in the second embodiment shown in FIGS. 9 and 10, the first loop antenna is more effective than in the first embodiment shown in FIGS. A magnetic field (magnetic flux) generated by the substantially U-shaped left-side protruding portions 35, 33, 42 of A and the second pattern portion 35 of the second loop antenna B is the first porous. It is further weakened not only by the porous sheet-like member 51 but also by the second porous sheet-like member 53. Nevertheless, for the books 1 placed on the shelf 5, mutual communication between the electronic tag 16 attached to the books 1 and the reader / writer antenna 15 is still effective over the entire shelf 5. Can be done.

3 and 3rd Example In the bookshelf 2 in the 3rd Example shown in FIGS. 11-13, as the member for interference prevention (in other words, shielding material) provided in the shelf boards 3-8, FIG. As in the case of the first embodiment shown in FIG. 4, substantially the entire bottom surfaces of the shelf boards 3 to 8 (in other words, almost the entire antenna patterns 23 of the first and second loop antennas A and B) are covered. In addition to the conductive and porous first sheet-like member 51, a conductive and porous third sheet-like member 55 configured in a closed loop shape is provided. Note that the bookshelf 2 in the third embodiment shown in FIGS. 11 to 13 may have substantially the same configuration as the bookshelf 2 in the first embodiment described above, except as described below. The books 1 in the third embodiment may have substantially the same configuration as the books 1 in the first embodiment described above. Therefore, in FIGS. 11-13, the same code | symbol is attached | subjected to FIG. 1-8 and a common part, and the description is abbreviate | omitted as needed. In the following description, only the third shelf 5 will be described, but the remaining shelves 3, 4, 6 to 8 have substantially the same configuration as the shelf 5 as necessary. It may be a different configuration.

In the shelf board 5 shown in FIGS. 11 to 13, a third porous sheet-like member 55 is provided as an interference preventing member (in other words, a shielding material) separately from the first porous sheet-like member 51. Is provided. As shown in FIG. 12, the third porous sheet-like member 55 uses a third intermediate film 56 on the lower surface of the second loop antenna B (in other words, on the upper surface side of the substrate 25). It can be attached by being bonded together. Such a third intermediate film 56 may be a film made of a suitable non-conductive material such as PET and having a thickness of, for example, about 300 μm, and one or both of the third porous sheet-like members 55 may be formed. It may be previously joined to the surface. In FIG. 11, the third porous sheet-like member 55 is indicated by a three-dot chain line for convenience of illustration. The length of the third porous sheet-like member 55 in the frontage direction x is substantially the same as, for example, the length L ₁ in the frontage direction x of the shelf 5 (in other words, 850 mm). Good. The length in the depth direction y of the third porous sheet-like member 55 may be substantially the same as, for example, the length L ₂ in the depth direction y of the shelf board 5 (in other words, 170 mm). .

  As shown in FIGS. 11 and 13, the third porous sheet-like member 55 is configured in a closed loop shape having a central opening (that is, a through opening) 57 formed by lacking a central portion in a substantially rectangular shape. Has been. And the outer periphery shape of the 3rd porous sheet-like member 55 is a substantially rectangular shape, Comprising: The outer periphery of the antenna 15 for reader / writers may be enlarged one time. Further, the inner peripheral shape of the third porous sheet-like member 55 (in other words, the shape of the central opening 57) is also substantially rectangular, and the outer periphery of the reader / writer antenna 15 is at least one in the depth direction y. It may be smaller. Note that the ratio of the size of the central opening 57 to the size of the third porous sheet-like member 55 (that is, the size including the central opening 57) (in other words, the third porous sheet-like member 55, The aperture ratio for the central opening 57 is about 50% in the illustrated embodiment. Further, the width of each side of the third porous sheet-like member 55 (in other words, the shortest distance from each side of the outer peripheral four sides of the third porous sheet-like member 55 to the central opening 57) is , About 35 mm (side on the rear edge 32 side), about 10 mm (side on the left side edge 34 side), about 35 mm (side on the front edge 36 side), and about 25 mm (side on the right side edge 38) Side edge).

  Accordingly, the third porous sheet-like member 55 has an overlapping portion that overlaps with the outer peripheral portion of the reader / writer antenna 15. Further, in the illustrated embodiment, the distance between the third porous sheet-like member 55 and the second loop antenna B (particularly, the antenna pattern 31) is, as shown in FIG. The thickness of the intermediate film 56 is approximately equal to about 300 μm. Further, the distance between the porous sheet-like member 41 and the first loop antenna A (particularly, the antenna pattern 23) is, as shown in FIG. 12, the thickness of the intermediate film 56 (about 300 μm), the second The thickness of the antenna pattern B and the thickness of the intermediate film 26 (about 300 μm) are approximately equal to about 1 mm.

The third porous sheet-like member 55 may be of the same material and composition as the first porous sheet-like member 51 described in the above section 1 (4). The third porous sheet-like member 55 generally satisfies one, plural or all numerical ranges described in the following items (a) to (ku) from the viewpoint of practicality. It is preferable. The numerical ranges in parentheses described in the following items (a) to (ku) are more preferable numerical ranges that are satisfied in the present invention.
(A) Ratio of the size of the central opening 57 to the size (that is, the size including the central opening 57) of the third porous sheet-like member 55: a range of 20 to 80% (30 to 70%);
(A) the width of one side of the third porous sheet-like member 55: a range of 2 to 80 mm (4 to 60 mm);
(C) The distance between the third porous sheet-like member 55 and the first loop antenna A (particularly, the antenna pattern 31) and the third porous sheet-like member 55 and the second loop antenna B ( In particular, the mutual distance from the antenna pattern 23) (in other words, the mutual distance between the third porous sheet-like member 55 and the reader / writer antenna 15 (particularly, the antenna pattern 23)): 0 In the range of 1-20 mm (0.2-15 mm),
(D) Maximum line width (cross-section) of the conductive linear member of the third porous sheet-like member 55 when the third porous sheet-like member 55 is a braided conductive linear member. Is approximately circular, the wire diameter) is in the range of 4 to 200 μm (8 to 100 μm),
(E) The pitch of the small holes of the third porous sheet-like member 55 (specifically, when the third porous sheet-like member 55 is a braid of conductive strips meshed, Pitch): in the range of 50 to 2,000 μm (100 to 1,200 μm),
(F) Maximum length of each small aperture of the third porous sheet-like member 55: a range of 60 to 3,000 μm (120 to 1,600 μm),
(G) Area per one of a large number of small openings of the third porous sheet-like member 55: a range of 4,000 to 1,800,000 μm ² (8,000 to 800,000 μm ² ), and (H) The opening ratio of the third porous sheet-like member 55 excluding the central opening 57 (in other words, the opening ratio for a large number of small holes): 70 to 95% (80 to 92%) Range.

The covering portion where the conductive and porous third sheet-like member 55 covers the reader / writer antenna 15 from the lower surface side of the shelf board 5 (in other words, the overlapping portion between them) is shown in FIGS. In the illustrated embodiment shown in FIG. 4, the following items (a) to (g) are described.
(A) the first pattern portion 33 of the first loop antenna A and the third pattern portion 37 of the second loop antenna B;
(B) the respective baseline portions 42 of the first and second loop antennas A and B;
(C) the connecting portion 47 of each of the first and second loop antennas A and B;
(D) Front and rear end portions of the second pattern portion 35 of each of the first and second loop antennas A and B,
(E) both front and rear ends of the fourth pattern portion 39 of each of the first and second loop antennas A and B;
(F) Front and rear ends of each of the first and second rising portions 45 and 46 of each of the first and second loop antennas A and B, and (g) the first and second loop antennas A and B Each pair of terminal portions 24a, 24b.

In the present invention, from the viewpoint of practicality, one or more or all of the antenna portions described in the items (a) to (g) are generally the third porosity. It is preferably covered with a sheet-like member 55. Further, in the present invention, from the viewpoint of practicality, one, a plurality, or all of the antenna portions described in the following items (h) to (k) are generally third. The porous sheet-like member 55 can be covered.
(H) the second pattern portion 35 of the first loop antenna A,
(I) a fourth pattern portion 39 of the second loop antenna B,
(J) the second pattern portion 35 of the second loop antenna B, and (k) the fourth pattern portion 39 of the first loop antenna A.

  Since it is as above-mentioned, in the antenna 15 for reader / writers in the 3rd Example shown in FIGS. 11-13, it is 1st and 2nd rather than the case in the 1st Example shown in FIGS. Of the antenna patterns 23 of the loop antennas A and B, respectively, are generated by antenna components extending along the frontage direction x (that is, the antenna components described in the items (a) to (c) above). The magnetic field (magnetic flux) is weakened not only by the first porous sheet upper member 51 but also by the third porous sheet-like member 55. In particular, as described above, the side on the rear edge portion 32 side of the third porous sheet-like member 55 is relatively wide (that is, about 35 mm). Therefore, even when a second bookshelf similar to the bookshelf 2 shown in FIG. 2 is arranged back to back on the bookshelf 2 shown in FIG. 2, the reader / writer antenna 15 of the bookshelf 2 shown in FIG. There is little possibility of interference between the two reader / writer antennas of the two shelves. Nevertheless, the antenna component extending along substantially the depth direction y of each of the antenna patterns 23 of the first and second loop antennas A and B (that is, as described in the items (d) to (f) above) Magnetic fields (magnetic fluxes) generated by the antenna components 35, 39, 45, and 46) are mutually exchanged between the electronic tag 16 attached to the books 1 placed on the shelf board 5 and the reader / writer antenna 15. It also functions effectively for communication. Therefore, in the illustrated embodiment, in order for the electronic tag 16 to be able to communicate with the reader / writer antenna 15 well, the front cover 17 or the back cover of the books 1 as shown in FIG. It is preferable that it is provided at 18 (particularly near its lower end).

4, 4th Example The bookshelf 2 in 4th Example shown in FIGS. 14-16 is the interference provided in the shelves 3-8 in the bookshelf 2 in 3rd Example shown in FIGS. 11-13. As a prevention member (in other words, a shielding material), a second porous sheet material member 53 provided on the bookshelf 2 in the second embodiment shown in FIGS. 9 and 10 is further provided. The bookshelf 2 in the fourth embodiment shown in FIGS. 14 to 16 may have substantially the same configuration as the bookshelf 2 in the third embodiment described above, except for the points described below. The books 1 in the fourth embodiment may have substantially the same configuration as the books 1 in the first embodiment described above. Therefore, in FIGS. 14-16, the same code | symbol is attached | subjected to FIG. 1-13 and a common part, and the description is abbreviate | omitted as needed. In the following description, only the third shelf 5 will be described, but the remaining shelves 3, 4, 6 to 8 have substantially the same configuration as the shelf 5 as necessary. It may be a different configuration.

  In the shelf board 5 shown in FIGS. 14-16, as a member for interference prevention (in other words, shielding material), apart from the 1st porous sheet-like member 51 and the 3rd porous sheet-like member 55, A second porous sheet-like member 53 shown in FIGS. 9 and 10 is provided. Such a second porous sheet-like member 53 is described in the above item 2 on the lower surface of the third porous sheet-like member 55 (in other words, the upper surface side of the substrate 25), as shown in FIG. The second intermediate film 54 which may be the same as the second intermediate film 54 may be attached by bonding. In FIG. 14, the second porous sheet-like member 53 is indicated by a two-dot chain line for the convenience of illustration. Further, the second porous sheet-like member 53 has a size, a shape, an arrangement relationship, a material, a composition, and the like in a plan view with respect to the shelf board 5 (in other words, the antenna pattern 23 of the reader / writer antenna 15). The configuration may be substantially the same as that of the second embodiment shown in FIGS. The second intermediate film 54 may be a film made of a suitable non-conductive material such as PET, and may be bonded in advance to one or both surfaces of the second porous sheet-like member 53.

  As described above, in the reader / writer antenna 15 in the fourth embodiment shown in FIGS. 14 to 16, the first and second embodiments are more effective than those in the third embodiment shown in FIGS. Of the antenna patterns 23 of the loop antennas A and B of the antennas extending along the frontage direction x (that is, the antenna components described in the items (a) to (c) in the item 3). The magnetic field (magnetic flux) generated in each of the above is weakened not only by the first porous sheet-like member 51 and the third porous sheet-like member 55 but also by the second porous sheet-like member 53. Nevertheless, the antenna components extending along the depth direction y of the antenna patterns 23 of the first and second loop antennas A and B (that is, the items (d) to (f) in the item 3). The magnetic tag (magnetic flux) generated by each of the antenna components 35, 39, 45, and 46) described in the item is attached to the books 1 placed on the shelf 5 and the reader / writer antenna It also functions effectively for mutual communication with 15. Therefore, in the illustrated embodiment, in order for the electronic tag 16 to be able to communicate with the reader / writer antenna 15 well, the front cover 17 or the back cover of the books 1 as shown in FIG. It is preferable that it is provided at 18 (particularly near its lower end).

5. Operation Experiment of Reader / Writer Antenna Next, regarding the operation experiment of the reader / writer antenna, “(1) First Example”, “(2) Fourth Example” and “(3) Porous Sheet” This will be described in detail with reference to FIGS.

(1) First Embodiment FIGS. 17 to 20 show positions in the frontage direction x with the electronic tag 16 of the reader / writer antenna 15 that are substantially the same as those in the first embodiment shown in FIGS. The maximum communicable distance (vertical axis) in a direction upward from the antenna center line 44 corresponding to the horizontal axis) (in other words, a direction orthogonal to both the frontage direction x and the depth direction y) is shown. In this case, the maximum communicable distance indicates a distance from the upper surface of the shelf board 5 (in other words, the coating film 27) to the lower side portion of the electronic tag 16 facing upward along the upward direction. Further, a negative area at the position (horizontal axis) in the frontage direction x indicates the reading range outside the left side of the shelf 11. 17 to 20, the line graph of the reference example 1 is almost the same leader as the case of the shelf board 5 without the shielding material shown in FIGS. 7 and 8 in the first embodiment described in the above item 1. This is for the writer antenna 15. The line graph of the first embodiment is about the reader / writer antenna 15 that is almost the same as that of the shelf board 5 with the shielding material shown in FIGS. 3 and 4 in the first embodiment described in the section 1 above. It is. Therefore, the line graph of Reference Example 1 is substantially the same in any of FIGS.

  17 to 20 are described so as to correspond to the shelf board 5 of the bookshelf 2 shown in FIGS. 2 and 3. 17 to 20, a broken line 35 at a position 0 mm in the frontage direction x indicates the left edge 34 toward the shelf board 5. Further, the broken line 35a at the position 10mm in the frontage direction x is the left edge portion (in other words, the first and second loop antennas A and B of the reader / writer antenna 15). The left edge portion 35a of the first loop antenna A toward the second pattern portion 35 is shown. 17 to 20, the line graph is shown up to a position 450 mm in the frontage direction x (in other words, the center position in the frontage direction x of the shelf 5).

17 to 20 show the distance between the first porous sheet-like member 51 and the antenna pattern 23 of the reader / writer antenna 15 (specifically, the antenna pattern 23 of the second loop antenna B) (in FIG. 4). The figures show cases where the thickness of the substrate 25 is approximately 3 mm, 13 mm, 23 mm, and 33 mm. 17 to 20 show the maximum communicable distance when the power is alternately supplied to the first and second loop antennas A and B of the reader / writer antenna 15 of the shelf board 5 (specifically, as described above. 2 shows the maximum communicable distance in the direction upward from the upper surface of the shelf board 5. Then, from the graphs of the maximum communicable distance shown in FIGS. 17 to 20, items described in the following items (a) to (c) can be understood.
(A) In the case of the shelf board 5 as Reference Example 1 shown in FIGS. 7 and 8, when power is supplied to the reader / writer antenna 15 of the shelf board 5, this occurs at the reader / writer antenna 15 of the shelf board 5 The generated magnetic field (magnetic flux) is generated in the shelf board 4 on the one level above the shelf board 5 or the reader / writer antenna 15 of the same shelf board 5 on another shelf 2 adjacent to the left side of the shelf board 5. Interferes with the magnetic field (magnetic flux) to a great extent,
(A) In the case of the shelf board 5 in the first embodiment shown in FIGS. 3 and 4, the distance between the first porous sheet-like member 51 and the antenna pattern 23 of the reader / writer antenna 15 is also determined. However, the interference described in the above item (a) is not generated to a considerable extent, and (c) even in the case of the shelf board 5 in the first embodiment shown in FIGS. For the books 1 placed, the books 5 over the entire shelf 5 depending on the distance between the first porous sheet-like member 51 and the antenna pattern 23 of the reader / writer antenna 15. The electronic tag 16 affixed to 1 and the reader / writer antenna 15 can communicate with each other effectively.

FIG. 21 shows a first graph summarizing the graphs of Reference Example 1 and Example 1 shown in FIGS. And in this FIG. 21, while a horizontal axis shows the reference example 1 each shown in FIGS. 17-20, the 1st porous sheet-like member 51 in the graph of Example 1 each shown in FIGS. The distance in the direction orthogonal to the shelf board 5 surface between the antenna pattern 23 and the antenna pattern 23 is shown. Moreover, the vertical axis | shaft has shown the communication distance similar to the vertical axis | shaft in the case of FIGS. In FIG. 21, the line graph itself is on the left side of the second pattern portion 35 of the antenna pattern 23 of the first loop antenna A of the reader / writer antenna 15 of the shelf board 5 shown in FIGS. The average value in the center position (namely, the range of 10 mm-450 mm) in the frontage direction x of the shelf board 5 from the edge part 35a is shown. Further, in FIG. 21, the solid line extending in the vertical direction through the average value corresponds to the corresponding distance in the horizontal axis direction (that is, between the first porous sheet-like member 51 and the antenna pattern 23. This is a line segment connecting the minimum value and the maximum value in (distance). Furthermore, FIG. 22 shows the 2nd graph which summarized the graph of the reference example 1 and Example 1 which are each shown in FIGS. Also in FIG. 22, the horizontal axis represents Reference Example 1 shown in FIGS. 17 to 20, and the first porous sheet-like member 51 in the graph of Example 1 shown in FIGS. 17 to 20. The distance in the direction orthogonal to the shelf 5 between the antenna pattern 23 and the antenna pattern 23 is shown. The vertical axis indicates the same communication distance (that is, the maximum communicable distance) as the vertical axis in the case of FIG. 17 to FIG. Accordingly, the negative value on the vertical axis indicates the distance from the left end 34 toward the shelf 11 toward the left. Then, from the graphs of the maximum communicable distance shown in FIG. 17 to FIG. 20 and FIG. 21 and FIG.
(D) The distance between the first porous sheet-like member 51 and the first loop antenna A (particularly, the antenna pattern 23) and the first porous sheet-like member 51 and the second loop antenna B ( In particular, each of the mutual intervals with the antenna pattern 23) (in other words, the mutual interval between the first porous sheet-like member 51 and the reader / writer antenna 15 (particularly, the antenna pattern 23)) In general, from the viewpoint of practicality, it is preferably in the range of 5 to 35 mm, more preferably in the range of 8 to 30 mm.

(2) Fourth Embodiment FIGS. 23 to 26 show positions in the frontage direction x of the electronic tag 16 of the reader / writer antenna 15 that are substantially the same as those of the fourth embodiment shown in FIGS. The maximum communicable distance (vertical axis) in a direction upward from the antenna center line 44 corresponding to the horizontal axis) (in other words, a direction orthogonal to both the frontage direction x and the depth direction y) is shown. In this case, the maximum communicable distance indicates a distance from the upper surface of the shelf board 5 (in other words, the coating film 27) to the lower side portion of the electronic tag 16 facing upward along the upward direction. Further, a negative area at the position (horizontal axis) in the frontage direction x indicates the reading range outside the left side of the shelf 11. 23 to 26, the line graph of the reference example 1 is almost the same leader as the case of the shelf board 5 without the shielding material shown in FIGS. 7 and 8 in the first embodiment described in the above item 1. This is for the writer antenna 15. The line graph of the fourth embodiment is about the reader / writer antenna 15 that is almost the same as that of the shelf board 5 with the shielding material shown in FIGS. 14 to 16 in the fourth embodiment described in the above section 4. It is. Therefore, the line graph of the reference example 1 is substantially the same in any of FIGS. 23 to 26 (and FIGS. 17 to 20). Also, the graphs of FIGS. 23 to 26 are drawn in substantially the same manner as the graphs of FIGS. Then, from the graphs of the maximum communicable distance shown in FIGS. 23 to 26, the matters described in the following items (a) and (b) can be understood.
(A) In the case of the shelf board 5 in the fourth embodiment shown in FIGS. 14 and 16, when power is supplied to the reader / writer antenna 15 of the shelf board 5, the reader / writer antenna 15 of the shelf board 5 The generated magnetic field (magnetic flux) is generated by the reader / writer antenna 15 of the shelf 4 in the upper stage of the shelf 5 or the similar shelf 5 of another shelf 2 adjacent to the left side of the shelf 5. The books 1 that are placed on the shelf 5 even in the case of the shelf 5 in the fourth embodiment shown in FIGS. 14 and 16, and that it hardly interferes with the generated magnetic field (magnetic flux). However, depending on the distance between the first porous sheet-like member 51 and the antenna pattern 23 of the reader / writer antenna 15, the electronic tag 16 attached to the books 1 is spread over the entire shelf 5. And the reader / writer antenna 15 Ri effectively that can be carried out.

  FIG. 27 shows a first graph summarizing the graphs of Reference Example 1 and Example 4 shown in FIGS. 23 to 26, respectively. In FIG. 27, the horizontal axis represents Reference Example 1 shown in FIGS. 23 to 26, and the first porous sheet-like member 51 in the graph of Example 4 shown in FIGS. 23 to 26. The distance in the direction orthogonal to the shelf board 5 surface between the antenna pattern 23 and the antenna pattern 23 is shown. The graph of FIG. 27 is drawn by substantially the same method as the graph of FIG. Further, FIG. 28 shows a second graph summarizing the graphs of Reference Example 1 and Example 4 shown in FIGS. 23 to 26, respectively. Also in FIG. 28, the horizontal axis indicates Reference Example 1 shown in FIGS. 23 to 26, and the first porous sheet-like member 51 in the graph of Example 4 shown in FIGS. 23 to 26, respectively. The distance in the direction orthogonal to the shelf 5 between the antenna pattern 23 and the antenna pattern 23 is shown. The graph of FIG. 28 is drawn by substantially the same method as the graph of FIG. Then, from the graphs of the maximum communicable distance shown in FIGS. 23 to 26 and FIGS. 27 and 28, it can be seen that the items described in the item (d) in the item (1) are also valid in this case. .

(3) Length of porous sheet-like member FIGS. 29 to 33 show antenna center lines corresponding to the positions in the frontage direction x of the reader / writer antenna 15 of the shelf board 5 of Reference Examples 1 to 6 and the electronic tag 16. The maximum communicable distance (vertical axis) in the direction upward from 44 (in other words, the direction orthogonal to both the frontage direction x and the depth direction y) is shown. The vertical axis indicates the same communication distance as the vertical axis in the case of FIGS. 17 to 20 (and thus FIGS. 23 to 26). 29 to 33, the line graph of Reference Example 1 is shown in FIGS. 17 to 20 (and thus FIGS. 23 to 26) within the range shown in FIGS. Substantially the same.

In the graphs of Reference Examples 2 to 6 shown in FIGS. 29 to 33, the width in the frontage direction x of the first porous sheet-like member 51 is 20.3 cm, 15.3 cm, 10.3 cm, 9 cm, and 5.3 cm. The case where the 1st porous sheet-like member 51 in which the width | variety in the frontage direction x becomes small sequentially by making it small sequentially is shown, respectively. In any of these FIGS. 29 to 33, the left edge portion 51 a toward the first porous sheet-like member 51 substantially coincides with the left edge portion 34 toward the shelf plate 5. The right edge 51b of the first porous sheet-like member 51 is indicated by a solid line 51b in FIGS. Therefore, in the case of the shelf board 5 in the first embodiment shown in FIGS. 3 and 4, all the pattern portions of the antenna pattern 23 of the reader / writer antenna 15 are connected to the first porous sheet-like member 51. In the case of Reference Examples 2 to 6 shown in FIG. 29 to FIG. 33, the pattern portions described in the following items (a) to (e) are the first porous sheet-like members. 51 and overlap. And the pattern part which the 1st porous sheet-like member 51 in the case of the reference example 4 shown in FIG. 31 overlaps is 2nd Example shown in FIG. 9 (as a result 4th Example shown in FIG. 14). The second porous sheet-like member 53 is substantially the same as the overlapping pattern portion.
(A) The leftmost first rising portion 45 facing the second pattern portion 35 of each of the first and second loop antennas A and B and the first and second loop antennas A and B, respectively. , Near the left end of the first loop antenna A toward the first pattern portion 33, near the left end of the second loop antenna B toward the third pattern portion 37, first and second The left half of the base line portion 42 facing the loop antennas A and B and the leftmost connecting portion 47 facing the first loop antenna A (the reference example shown in FIG. 29). 2),
(B) The second pattern portion 35 of each of the first and second loop antennas A and B, the leftmost first rising portion 45 facing the first loop antenna A, and the first loop antenna A Near the left end of the first pattern portion 33, near the left end of the third pattern portion 37 of the second loop antenna B, and farthest left toward the first loop antenna A The left half of the baseline portion 42 and the leftmost baseline portion 42 toward the second loop antenna B (in the case of Reference Example 3 shown in FIG. 30),
(C) The second pattern portion 35 of each of the first and second loop antennas A and B, the vicinity of the left end toward the first pattern portion 33 of the first loop antenna A, and the first loop Half of the left side of the leftmost baseline portion 42 facing the antenna A (in the case of Reference Example 4 shown in FIG. 31),
(D) The second pattern portion 35 of the first loop antenna A, the first pattern portion 33 of the first loop antenna A near the left end and the first loop antenna A Near the left base line portion 42 toward the left end portion (in the case of the reference example 5 shown in FIG. 32), and (e) the second pattern portion 35 of the first loop antenna A (the reference example shown in FIG. 33). 6).

Then, from the graphs of the maximum communicable distance shown in FIG. 7 to FIG. 20 and FIG. 29 to FIG.
(E) The first porous sheet-like member 51 includes as many pattern portions as possible of the substantially loop-shaped antenna patterns 23 of the first and second loop antennas A and B of the reader / writer antenna 15. It is preferable that it overlaps, and it is further preferable that it overlaps with almost all of the pattern portions.

  Although the first and second embodiments of the present invention have been described in detail above, the present invention is not limited to these embodiments and is based on the gist of the invention described in the claims. Various changes and modifications are possible.

  For example, in the first to fourth embodiments described above, as shown in FIG. 2, the upper and lower 6-level shelf boards 3 to 8 are provided on the bookshelf 2, but the upper and lower 6-level shelf boards are not necessarily provided. There is no need, and other multiple stages of 5 stages or less or 7 stages or more may be provided above and below, and in some cases, only one stage may be provided.

  In the first to fourth embodiments described above, the present invention is applied to the bookshelf 2. However, the present invention is not limited to various article placement shelves such as display shelves, product shelves, document management shelves, article holding shelves, counter counters such as reception counters such as libraries, tables, desks, etc. The present invention can be applied to an article placement table on which articles are placed, and can also be used as a distribution reading antenna in a production line. Accordingly, the reader antenna according to the present invention is not limited to the substantially rectangular substrate 25 such as the shelves 3 to 8 of the bookshelf 2, but is substantially square, substantially parallelogram, substantially trapezoidal, substantially oval, etc. It can be incorporated in a substrate having various shapes.

  In the first to fourth embodiments described above, the substantially loop-shaped antenna pattern 23 of the first and second antennas A and B of the reader / writer antenna 15 is one-turn. Alternatively, a plurality of windings wound in a spiral shape or the like may be used.

  In the first to fourth embodiments described above, the antenna pattern elements 33, 35, 37, 39, 42, 45 to 47 of the first and second antennas A and B of the reader / writer antenna 15 are used. Most of the connecting parts between each other were formed in a substantially pointed shape with little roundness. However, one or more or all of these connected parts may be formed in a more rounded shape.

  In the first to fourth embodiments described above, the number of the bent portions 43 of each of the first and second antennas A and B of the reader / writer antenna 15 is four. However, the number of the bent portions 43 is not necessarily four, but may be any number greater or smaller than that, and may be one in some cases.

  In the first to fourth embodiments described above, the pair of terminal portions 24a and 24b of the first loop antenna A and the pair of terminal portions 24a and 24b of the second loop antenna B are respectively connected to the shelf. It was provided near the edge 38 on the right side of the plate 5. However, each of the pair of terminal portions 24a and 24b of the first and second loop antennas A and B has the rear edge portion 32 of the shelf board 5, the left edge portion 34, the front edge portion 36 and the facing portion. It can be provided near any edge of the right edge 38. For example, in the shelf board 5 shown in FIG. 3, the pair of terminal portions 24 a and 24 b of the second loop antenna B are substantially symmetrical with the pair of terminal portions 24 a and 24 b of the first loop antenna A. The second loop antenna B may be provided in the vicinity of the left edge 34 facing the pair of terminal portions 24a and 24b.

  In the first to fourth embodiments described above, the aperture ratio of the first porous sheet-like member 51 (that is, the aperture ratio described in the item (F) in the item (1)) is determined. It was made uniform throughout. However, the aperture ratio of the first porous sheet-like member 51 is not necessarily uniform as a whole, and may be partially different. For example, in the first embodiment described above, a part of the first porous sheet-like member 51 (specifically, it overlaps with the second porous sheet-like member 53 in the second embodiment described above). The first porous sheet-like member 51 is used as an interference preventing member by reducing the aperture ratio of the part and the part overlapping the third porous sheet-like member 55 in the third embodiment described above. By just using it, it is possible to achieve an effect similar to that of the second embodiment described above or the third embodiment described above.

  In the second to fourth embodiments described above, the opening ratio of the second porous sheet-like member 53 and the third porous sheet-like member 55 is set to the opening of the first porous sheet-like member 51. The rate was almost the same and made uniform throughout. However, the respective aperture ratios of the second porous sheet-like member 53 and the third porous sheet-like member 55 are not necessarily the same as the aperture ratio of the first porous sheet-like member 51. Moreover, it does not necessarily need to be uniform as a whole.

  In the third and fourth embodiments described above, a single central opening 57 is provided in the third porous sheet-like member 55. However, the number of central openings 57 provided in the third porous sheet-like member 55 is not necessarily one, and may be two or more. For example, one or a plurality of strips extending substantially along the depth direction y in the central opening 57 shown in FIGS. 11 and 13, or one extending substantially along the frontage direction x in the central opening 57. Alternatively, two or more central openings 57 can be provided in the third porous sheet-like member 55 by providing a plurality of belt-like portions in the third porous sheet-like member 55.

  In the first to fourth embodiments described above, the first porous sheet-like member 51 is disposed on the lower surface of the antenna formation target member such as the shelf board 5. However, the first porous sheet-like member 51 can be arranged on the upper surface side of the antenna formation target member by changing the upper and lower sides of the reader / writer antenna 15 depending on the application and the like. A pair of upper and lower sides may be provided on the upper surface side and the lower surface side of the member to be formed.

  In the second to fourth embodiments described above, the second porous sheet-like member 53 and the third porous sheet-like member 55 are respectively connected to the upper surface side of the antenna forming target member such as the shelf board 5. Arranged. However, each of the second porous sheet-like member 53 and the third porous sheet-like member 55 can be disposed on the lower surface side of the antenna formation target member depending on the application, etc. A pair of upper and lower sides may be disposed on the upper surface side and the lower surface side of the target member.

  In the second to fourth embodiments described above, the second porous sheet-like member 53 and the third porous sheet-like member 55 are respectively replaced with the second intermediate film 54 and the third intermediate film. The reader / writer antenna 15 is pasted through each of 56. However, each of the second porous sheet-like member 53 and the third porous sheet-like member 55 can be directly bonded to the first porous sheet-like member 51 with an appropriate adhesive.

  In the second to fourth embodiments described above, each of the second porous sheet-like member 53 and the third porous sheet-like member 55 is formed into the first porous sheet-like shape of the substrate 25. It was disposed on the surface opposite to the member 51. However, each of the second porous sheet-like member 53 and the third porous sheet-like member 55 is disposed on the upper side surface or the lower side surface of the first porous sheet-like member 51 as necessary. You can also.

  In the fourth embodiment described above, the second porous sheet-like member 53 is disposed on the lower surface of the third porous sheet-like member 55. However, the second porous sheet-like member 53 is provided on the upper side surface of the third porous sheet-like member 55 (specifically, the second loop antenna B and the third porous sheet-like member as necessary). (Between the members 55) and disposed on the surface of the substrate 25 opposite to the third porous sheet-like member 55 (specifically, the lower surface of the substrate 25). You can also.

  Furthermore, in the second and fourth embodiments described above, the second porous sheet-like member 53 is disposed near one end in the length direction x of the antenna pattern 23 of the reader / writer antenna 15 (specifically, Is disposed only in the vicinity of the left end). However, the second porous sheet-like member 53 can be disposed only in the vicinity of the other end in the length direction x of the antenna pattern 23 of the reader / writer antenna 15, and in addition, in the vicinity of both ends. (Specifically, a pair may be provided in each of the vicinity of the left end portion and the vicinity of the right end portion).

It is a front view of the bookshelf to which the conventional bookshelf management system is applied. (Conventional example 1) It is a front view of the bookshelf in the 1st example which applied the present invention to the bookshelf management system. (Example 1) FIG. 3 is a plan view of a third shelf board in FIG. 2. (Example 1) FIG. 4 is an enlarged vertical sectional view of a part of the shelf board of FIG. 3. (Example 1) It is an expansion perspective view of an example of the books of FIG. (Example 1) It is an expansion perspective view of another example of the books of FIG. (Example 1) FIG. 5B is an enlarged plan view of the electronic tag of FIG. 5A. (Example 1) It is a top view of the shelf board of FIG. 3 in the state without the shielding material in which the electroconductive porous sheet-like member is not attached. (Example 1) FIG. 8 is an enlarged longitudinal sectional view of a part of the shelf board without a shielding material in FIG. 7. (Example 1) It is a top view of the shelf board of the 3rd stage of the bookshelf in the 2nd Example which applied this invention to the bookshelf management system. (Example 2) FIG. 10 is an enlarged longitudinal sectional view of a part of the shelf board of FIG. 9. (Example 2) It is a top view of the shelf board of the 3rd stage of the bookshelf in the 3rd Example which applied this invention to the bookshelf management system. (Example 3) It is an enlarged vertical sectional view of a part of the shelf board of FIG. (Example 3) It is a disassembled perspective view of the 1st and 3rd porous sheet-like member attached to the shelf board of FIG. (Example 3) It is a top view of the shelf board of the 3rd stage of the bookshelf in the 4th Example which applied this invention to the bookshelf management system. Example 4 It is an enlarged vertical sectional view of a part of the shelf board of FIG. Example 4 It is a disassembled perspective view of the 1st, 2nd and 3rd porous sheet-like member attached to the shelf board of FIG. Example 4 The maximum communicable distance in the vertical direction according to the position in the front-end direction with the electronic tag of the reader / writer antenna of the first embodiment when the distance between the first porous sheet-like member and the antenna pattern is 3 mm It is a graph which shows with the case of the reference example 1. FIG. (Example 1 and Reference Example 1) FIG. 18 is a graph similar to the case shown in FIG. 17 when the distance between the first porous sheet-like member and the antenna pattern is 13 mm. (Example 1 and Reference Example 1) FIG. 18 is a graph similar to the case shown in FIG. 17 when the distance between the first porous sheet-like member and the antenna pattern is 23 mm. (Example 1 and Reference Example 1) FIG. 18 is a graph similar to the case shown in FIG. 17 when the distance between the first porous sheet-like member and the antenna pattern is 33 mm. (Example 1 and Reference Example 1) The maximum communicable distance in the vertical direction according to the distance between the first porous sheet-like member and the antenna pattern with the electronic tag of the reader / writer antenna of the first embodiment is the same as in the case of Reference Example 1. It is a graph to show. (Example 1 and Reference Example 1) The maximum communicable distance in the left-right direction according to the distance between the first porous sheet-like member and the antenna pattern with the electronic tag of the reader / writer antenna of the first embodiment is the same as in Reference Example 1. It is a graph to show. (Example 1 and Reference Example 1) The maximum communicable distance in the vertical direction according to the position in the front direction of the antenna for the reader / writer antenna of the fourth embodiment when the distance between the first porous sheet-like member and the antenna pattern is 3 mm It is a graph which shows with the case of the reference example 1. FIG. (Example 4 and Reference Example 1) FIG. 24 is a graph similar to that shown in FIG. 23 when the distance between the first porous sheet-like member and the antenna pattern is 13 mm. (Example 4 and Reference Example 1) FIG. 24 is a graph similar to that shown in FIG. 23 when the distance between the first porous sheet-like member and the antenna pattern is 23 mm. (Example 4 and Reference Example 1) FIG. 24 is a graph similar to that shown in FIG. 23 when the distance between the first porous sheet-like member and the antenna pattern is 33 mm. (Example 4 and Reference Example 1) The maximum communicable distance in the vertical direction according to the distance between the first porous sheet-like member and the antenna pattern with the electronic tag of the reader / writer antenna of the fourth embodiment is the same as in the case of Reference Example 1. It is a graph to show. (Example 4 and Reference Example 1) The maximum communicable distance in the left-right direction according to the distance between the first porous sheet-like member and the antenna pattern with the electronic tag of the reader / writer antenna of the fourth embodiment is the same as in the case of Reference Example 1. It is a graph to show. (Example 4 and Reference Example 1) 7 is a graph showing the maximum communicable distance in the vertical direction according to the frontage direction of the reader / writer antenna of Reference Example 2 together with the case of Reference Example 1. FIG. (Reference Examples 1 and 2) 20 is a graph similar to that shown in FIG. 19 for the reader / writer antenna of Reference Example 3. (Reference Examples 1 and 3) 20 is a graph similar to that shown in FIG. 19 for the reader / writer antenna of Reference Example 4. (Reference Examples 1 and 4) 20 is a graph similar to that shown in FIG. 19 for the reader / writer antenna of Reference Example 5. (Reference Examples 1 and 5) 20 is a graph similar to that shown in FIG. 19 for the reader / writer antenna of Reference Example 6. (Reference Examples 1 and 6)

Explanation of symbols

A First loop antenna B Second loop antenna x Frontage direction (second direction)
y Depth direction (first direction)
2 Bookshelf (article placement shelf)
3 Top shelf (antenna formation target member)
4 Second shelf board (antenna forming target member)
5 3rd shelf (antenna forming target member)
6 4th shelf (antenna forming target member)
7 5th shelf board (antenna forming target member)
8 Bottom shelf (antenna formation target member)
15 antenna 23 for reader / writer substantially loop-shaped antenna pattern 33 first pattern portion 35 second pattern portion 37 third pattern portion 39 fourth pattern portion 42 base line portion 43 bent portion 45 first rising portion 46 Second rising portion 51 Conductive and porous first sheet-like member 53 Conductive and porous second sheet-like member 55 Conductive and porous third sheet-like member 57 Central opening

Claims (19)

In the reader antenna having an antenna pattern formed on one plate surface in a state parallel to one of the pair of plate surfaces of the antenna formation target plate,
The first sheet-like member, which has no central opening and is conductive and porous, is parallel to the other plate surface of the pair of plate surfaces of the antenna forming target plate. Provided on the plate surface ,
The outer periphery of the first sheet-like member that does not have the central opening extends substantially along the outer periphery of the antenna pattern in a plan view.
A second sheet-like member that is electrically conductive and porous is parallel to the one plate surface of the antenna forming target plate between the antenna forming target plate and the antenna pattern . Provided on the plate surface ,
The reader antenna, wherein the second sheet-like member has a central opening and extends in a loop shape substantially along the outer periphery of the antenna pattern as viewed in a plan view.   The first porous sheet-like member and the second porous sheet-like member each have a mesh structure in which conductive filaments are braided into a mesh shape. Reader antenna.   The pitch of the small apertures of each of the first porous sheet-like member and the second porous sheet-like member is in the range of 50 to 2,000 µm. Reader antenna. The area per one of a large number of small openings in each of the first porous sheet-like member and the second porous sheet-like member is in the range of 4,000 to 1,800,000 μm ^2. The reader antenna according to claim 1, 2, or 3.   Each of the first porous sheet-like member and the second porous sheet-like member has an opening ratio of 70 to 95% for a large number of small holes formed therein. The reader antenna according to any one of claims 1 to 4, wherein the reader antenna is provided.   6. The reader antenna according to claim 1, wherein a distance between the first porous sheet-like member and the antenna pattern is in a range of 5 to 35 mm.   The conductive and porous third sheet-like member overlapping the vicinity of any one of the end portions of the antenna pattern is the one end portion of the antenna formation target plate. The reader antenna according to claim 1, wherein the reader antenna is provided at least at a location corresponding to the vicinity.   8. The reader antenna according to claim 7, wherein a ratio of the size of the central opening to the size of the second porous sheet-like member including the central opening is in a range of 20 to 80%. The outer periphery of the second porous sheet-like member extends along the outer periphery of the antenna pattern of the reader / writer antenna or the outside thereof in a plan view,
The inner periphery of the second porous sheet-like member satisfies the conditions described in the following items (a) to (d) when viewed in plan: 9 or 8 The antenna for readers described in 1.
(A) The second inner periphery of the second porous sheet-like member on the first side in the first direction of the antenna forming plate is perpendicular to the first direction. Of the pattern portion extending substantially along the direction of the inner side of the pattern portion extending on the outermost periphery of the first side in the first direction or extending substantially along the inner side thereof. Doing things,
(B) The inner periphery on the second side opposite to the first side in the first direction of the antenna forming target plate of the inner periphery of the second porous sheet-shaped member is: Of the pattern portions extending substantially along the second direction, the inner end of the pattern portion extending on the outermost periphery on the second side in the first direction or substantially on the inner side thereof. Extending along,
(C) Of the inner periphery of the second porous sheet-like member, the inner periphery on the first side in the second direction of the antenna forming target plate extends substantially along the first direction. And extending substantially along the outer edge of the pattern portion extending on the outermost periphery of the first side in the second direction in the second direction of the existing pattern portion, and ( d) The inner periphery on the second side opposite to the first side in the second direction of the antenna formation target plate of the inner periphery of the second porous sheet-shaped member is the above-mentioned Of the pattern portion extending substantially along the first direction, the outer edge of the pattern portion extending on the outermost periphery of the second side in the second direction or substantially along the outside thereof. It must be extended.   The first side in the first direction of the pattern portion in which the second porous sheet-like member substantially extends in the second direction of the antenna formation target plate when seen in a plan view. 10. The reader antenna according to claim 9, wherein the reader antenna substantially overlaps with a pattern portion extending in the vicinity of the end portion and the end portion on the second side.   The second porous sheet-like member substantially overlaps with all pattern portions extending substantially along the second direction when viewed in a plan view. The reader antenna as described.   The second porous sheet-like member does not substantially overlap any pattern portion extending substantially along the first direction in a plan view. The antenna for a reader according to 9, 10 or 11.   13. The reader antenna includes first and second loop antennas respectively provided on the antenna forming target plate in a state where they are insulated from each other and overlapped with each other. The antenna for readers as described in any one of these. Each of the first and second loop antennas includes a substantially loop-shaped antenna pattern,
Each of the substantially loop-shaped antenna pattern of the first loop antenna and the substantially loop-shaped antenna pattern of the second loop antenna is a first side in a first direction of the antenna formation target plate. A first pattern portion provided on the antenna pattern, a second pattern portion provided on a first side in a second direction orthogonal to the first direction of the antenna formation target plate, and the antenna formation target. A third pattern portion provided on a second side opposite to the first side in the first direction of the plate; and the first side in the second direction of the antenna forming target plate. And a fourth pattern portion provided on the second side opposite to
Each of the third pattern portion of the first loop antenna and the first pattern portion of the second loop antenna includes a plurality of baseline portions that are intermittently disposed with each other, and Each having at least one bent portion provided between a plurality of baseline portions,
Each of the bent parts is configured to have a substantially convex shape including a first rising part and a second rising part,
The first rising portion or the second rising portion of the first loop antenna is between the first rising portion corresponding to the first rising portion of the second loop antenna and the second rising portion corresponding to the first rising portion. The reader antenna according to claim 13, wherein the first loop antenna is displaced in the second direction with respect to the second loop antenna so as to be disposed in the antenna.   The reader antenna according to claim 1, wherein the reader antenna is configured as a reader / writer antenna.   An article mounting shelf with an antenna, comprising a shelf plate on which the reader antenna according to any one of claims 1 to 15 is formed as the antenna formation target plate.   The article mounting shelf with an antenna according to claim 16, wherein the article mounting shelf with an antenna is a bookshelf with an antenna.   The article mounting shelf with an antenna according to claim 16 or 17, wherein at least one of the shelf boards is configured to be able to change a mounting position in a vertical direction.   An article mounting table with an antenna, comprising: a base plate on which the reader antenna according to claim 1 is formed as the antenna forming target plate.

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