JP4688167B2 - 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 an article mounting shelf with an antenna and an article mounting table with an antenna each provided with a shelf board and a base board on which such an antenna for a reader is provided.

  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, goods storage shelves such as display shelves, product shelves, bookshelves, document management shelves, library reception counters, etc. Are placed on an article placement table such as a counter table, 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.

  A bookshelf search system using an antenna system including a reader / writer antenna and an electronic tag as described above is conventionally known. Such a bookshelf search system is configured such that the information about the books is recorded and the electronic tag attached to the front cover or back cover of the books and the shelf on which the books are placed are arranged in the length direction of the shelves. And at least one reader / writer antenna disposed so as to extend along the line. In general, a plurality of shelves with antennas such as a plurality of upper and lower stages are provided on a single shelf. 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.

As such a shelf search system, conventionally, the following has been devised. For example, in Patent Document 1, a plurality of simple loop antennas are provided as reader / writer antennas along the length direction on the back plate surface or shelf plate surface of a bookshelf. At this time, the plurality of loop antennas are commonly used. A bookshelf search system is disclosed in which the plurality of loop antennas are sequentially switched and operated while being shifted by a half pitch in the length direction of the back plate surface or common shelf plate surface. In this case, the electronic tag is affixed to the front cover surface or back cover surface of the books placed on the shelf board. Further, in Patent Document 2, a plurality of loop antennas, each of which has a serrated bent portion, are arranged as reader / writer antennas so as not to completely overlap each other on a common shelf surface of a bookshelf. In addition, a bookshelf search system including a power supply control unit that supplies power to the plurality of loop antennas so as not to overlap in time is disclosed. Also in this case, the electronic tag is affixed to the front cover surface or the back cover surface of the books placed on the shelf board. Further, Patent Document 3 discloses a bookshelf search in which a single loop antenna of a plurality of turns wound in a spiral shape is provided as a reader / writer antenna along the length direction on the back plate surface of the bookshelf. A system is disclosed. Also in this case, the electronic tag is affixed to the front cover surface or the back cover surface of the books placed on the shelf board.
JP 2003-72919 A JP 2003-168914 A JP 2003-252409 A

On the other hand, the following has been devised as a bookshelf search system that prevents interference between the upper and lower shelf boards in the bookshelf. For example, in Patent Document 4, the shelf plate provided with the reader / writer antenna is provided with a plurality of or one longitudinal reinforcing member extending along the length direction, thereby improving the strength of the shelf plate. A bookshelf search system is disclosed that is reinforced and prevents radio signal interference between a plurality of reader / writer antennas on a plurality of upper and lower shelf boards. In this case, the interference-preventing longitudinal reinforcing member is configured to be narrow when there are a plurality of the reinforcing members and to be wide when there is one. The electronic tag is affixed to the back cover of books placed on the shelf board. Further, Patent Document 5 reinforces the strength of the shelf board by providing a plurality of longitudinal reinforcing members extending along the length direction on the shelf board provided with the reader / writer antenna. In addition, there is disclosed a bookshelf search system that prevents mutual cancellation of magnetic fields (magnetic fluxes) generated by a plurality of upper and lower reader / writer antennas on a plurality of upper and lower shelf boards. Further, in Patent Document 5, an iron plate is attached to the side plates of the bookshelf, thereby preventing the bookshelves from canceling each other between the magnetic fields generated by the left and right reader / writer antennas on the left and right shelves. A search system is also disclosed. In any of these cases, the electronic tag is affixed to the spine of a book placed on the shelf board.
Japanese Patent Laid-Open No. 2001-225921 JP 2001-270608 A

However, the conventional bookshelf search systems as disclosed in Patent Documents 1 to 5 have problems as described in the following items (A) to (F). The reason why these problems occur is as described in the items (a) to (f) sequentially described next to the descriptions of the items (A) to (F).
(A) The reader / writer antenna provided for each shelf board in the bookshelf search systems described in Patent Documents 4 and 5 is a simple rectangular loop antenna or a character shape of “8” (specifically, Is formed by a single loop antenna having an “8” shape laid down when viewed from the diagonally upper side on the front side. Therefore, when the longitudinal reinforcing member for preventing interference is provided on the shelf plate in order to prevent interference between the upper and lower shelf plates, the electronics of the antenna for the reader / writer are compared with when the reinforcing member is not provided. Good communication with the tag cannot be obtained.
(A) The reader / writer antennas described in Patent Documents 4 and 5 are located in the vicinity of the central portion in the length direction (that is, the frontage direction) between a pair of pattern portions that extend in the depth direction and are adjacent to each other. The electronic tag attached to the front cover or back cover of books cannot be communicated satisfactorily. When the interference prevention longitudinal auxiliary member is provided on the shelf board, the communication state in the above case with the electronic tag of the reader / writer antenna is further deteriorated.
(B) Even if the interference prevention longitudinal reinforcing members shown in FIGS. 2, 4 and 5 of Patent Document 4 are provided in the bookshelf search system described in Patent Documents 1 to 3, mutual reciprocity between adjacent shelf boards Interference cannot be satisfactorily prevented, or good communication with the electronic tag of the reader / writer antenna cannot be obtained.
(B) When the interference-preventing longitudinal reinforcing member shown in FIGS. 2 and 4 of Patent Document 4 is provided on the shelf board on which the reader / writer antenna described in Patent Documents 1 to 3 is formed, It is impossible to prevent mutual interference between the left shelf and the right shelf adjacent to the left and right sides, respectively. Further, when the interference prevention longitudinal reinforcing member shown in FIG. 5 of Patent Document 4 is provided on the shelf board on which the reader / writer antenna described in Patent Documents 1 to 3 is formed, the electronic tag of the reader / writer antenna and The communication performance will be significantly reduced.
(C) Even if the interference prevention plate-like member shown in FIG. 6 of Patent Document 5 is provided in the bookshelf search systems described in Patent Documents 1 to 3, a good communication state with the electronic tag of the reader / writer antenna is obtained. Absent.
(C) In the bookshelf search system described in Patent Literatures 1 to 3, as shown in FIG. 6 of Patent Literature 5, when an iron plate is attached to the side plate of the bookshelf, it is placed on the shelf plate near the side plate. The electronic tags of the books cannot communicate well with the reader / writer antenna provided on the shelf board.
(D) In the bookshelf search system described in Patent Documents 1 and 2, the electronic tag can be attached to the front cover surface or the back cover surface of books. However, Patent Documents 1 and 2 do not describe a technique for preventing mutual interference between adjacent shelf boards. In this bookshelf search system, there is a high possibility of causing mutual interference between shelf boards adjacent to each other in the up-down direction, the left-right direction, the front-rear direction, etc. Therefore, it is necessary to increase the interval between the adjacent shelf boards. Also, the space factor is bad. Furthermore, in the bookshelf search system described in Patent Document 3, since the structure of the electronic tag is complicated, the electronic tag that should be inexpensive is expensive.
(D) For example, as described in paragraph [0065] of Patent Document 1, a reader / writer antenna provided on a certain shelf board has an electronic tag of books on the shelf board and the shelf board. There is a possibility of communicating with both of the electronic tags of the books below. Further, as described in paragraph [0066] of Patent Document 1, an antenna switching unit including an extra function and a large rectangular parallelepiped storage box that accommodates extra various lines are necessary. Space is required and the space factor is bad. In the bookshelf search systems described in Patent Documents 1 and 2, the reader / writer antenna is a combination of a plurality of loop antennas. When the plurality of loop antennas are arranged one above the other on the shelf board, the reader / writer antenna is composed of a single loop antenna by mutual coupling of the plurality of loop antennas. Thus, the maximum communicable distance between the reader / writer antenna and the electronic tag decreases. However, in the vicinity of the left and right edges of the shelf board, a semi-loop antenna pattern portion (specifically, a substantially U-shaped protruding portion) that is substantially isolated from other antenna pattern portions. Each exists. Therefore, the reader / writer antenna attached to a certain shelf board is the same half-loop antenna as another shelf board adjacent to the upper and lower sides and the right and left sides, particularly in the vicinity of the left and right ends of the shelf board. Interference with the pattern part is likely to occur. For this reason, even if the books are small, it is necessary to provide sufficient space between the shelf plates adjacent to each other in the vertical direction, and it is also necessary to provide as much space as possible between the shelf plates adjacent to each other on the left and right. The space factor is also bad. Furthermore, in the bookshelf search system described in Patent Document 3, it is necessary to use an electronic tag attached to books with a special structure combining an air-core coil and a magnetic core. It is.
(E) When the reader / writer antenna is provided on the back plate surface of the shelf as in the bookshelf search system described in Patent Documents 1 and 3, the communication performance with the electronic tag of the reader / writer antenna is improved. In order to do this, it is necessary to attach an electronic tag to the front cover or back cover of the books near the front edge.
(E) Since there are various sizes of books, when a large number of books are arranged on the back plate side on the shelf board, the title portion described on the back cover of the books has a large number of books. Therefore, it is difficult for users of the bookshelf to browse a large number of books.
(F) In the case of glass shelves such as glass display shelves and merchandise shelves used in stores etc., as shown in FIG. The space factor is poor because interference between a pair of shelves cannot be prevented.
(F) In the case of the glass shelf as described above, the side plate itself does not exist between a pair of shelf plates adjacent to each other on the left and right, so that a shield such as an iron plate is used as shown in FIG. The material cannot be provided on the side plate. For this reason, it is necessary to provide a certain distance between a pair of adjacent reader / writer antennas formed on a pair of adjacent shelf plates. Therefore, the space factor is bad.
JP 2003-72919 A JP 2003-168914 A JP 2003-252409 A Japanese Patent Laid-Open No. 2001-225921 JP 2001-270608 A

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

According to the first aspect of the present invention, in a reader / writer antenna having an antenna pattern formed on a member to be formed with an antenna, the conductive and porous sheet-like member is the antenna as viewed in a plan view. The present invention relates to a reader antenna, characterized in that it is provided on the antenna forming target member so as to extend in a loop shape substantially along the outer periphery of the pattern. In this case, the porous sheet-like member can have a mesh structure in which conductive filaments are braided into a mesh shape. The ratio of the size of the central opening to the size of the porous sheet-like member including the central opening is preferably in the range of 20 to 80% (more preferably 30 to 70%). The pitch of the small holes of the porous sheet-like member is preferably in the range of 50 to 2,000 μm (more preferably 100 to 1,200 μm). Moreover, the area per one large number of small holes of the porous sheet-like member is preferably 4,000 to 1,800,000 μm ² (more preferably 8,000 to 800,000 μm ² ). Range. Further, the opening ratio of the porous sheet-like member for a large number of small holes formed therein is preferably in the range of 70 to 95% (more preferably 80 to 92%). 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 second sheet-like member is provided at a location corresponding to the vicinity of any one of the antenna forming target members.

In the first aspect of the present invention, the outer periphery of the 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 porous 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 member in the inner periphery of the porous sheet-shaped member is orthogonal to the first direction. The inner end of the pattern portion extending on the outermost periphery on the first side in the first direction among the pattern portions extending substantially along the second direction (for example, the frontage direction) Or extend almost along the inside,
(B) The inner periphery on the second side opposite to the first side in the first direction of the antenna forming target member of the inner periphery of the porous sheet-shaped member is the second side. Of the pattern portion extending substantially along the direction of the first portion, the inner end of the pattern portion extending on the outermost periphery of the second side in the first direction in the first direction or extending substantially along the inner side thereof. Being present,
(C) Of the inner periphery of the porous sheet-like member, the inner periphery on the first side of the antenna formation target member in the second direction 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, or (d) the pattern portion Of the inner periphery of the porous sheet-like member, the inner periphery of the second side of the antenna forming target member opposite to the first side in the second direction is substantially in the first direction. The pattern portion that extends along the outer edge of the pattern portion that extends on the outermost periphery on the second side in the second direction in the pattern portion that extends along or extends substantially along the outside thereof. .

  In this case, the porous sheet-like member is the first side in the first direction of the pattern portion substantially extending in the second direction of the antenna formation target member when seen in a plan view. And the pattern portion extending in the vicinity of the end portion and the vicinity of the end portion on the second side may substantially overlap each other. Moreover, the said porous sheet-like member may overlap with all the pattern parts extended substantially along the said 2nd direction seeing planarly. Further, the porous sheet-like member may not substantially overlap with any pattern portion extending substantially along the first direction as viewed in a plan view.

  In the first aspect of the present invention, the reader antenna may be provided with first and second loop antennas respectively provided on the antenna forming target member in a state where they 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 includes a first pattern portion provided on a first side in a first direction (for example, a depth direction) of the antenna formation target member, and the first pattern of the antenna formation target member. A second pattern portion provided on a first side in a second direction (for example, a frontage direction) orthogonal to the direction of the first direction, and the first side in the first direction of the antenna forming target member; Is a third pattern portion provided on the second side opposite to the second side, and a first pattern opposite to the first side in the second direction of the antenna forming target member. A fourth pattern portion provided on the side of the first loop antenna, and the third pattern portion of the first loop antenna and the first pattern portion of the second loop antenna are intermittent to each other. Each of the plurality of baseline portions and at least one bent portion provided between the plurality of baseline portions, and each of the bent portions has a first rising edge. And a second rising portion, the first rising portion or the second rising portion of the first loop antenna corresponding to that of the second loop antenna. The first loop antenna is displaced in the second direction with respect to the second loop antenna so that the first loop antenna is disposed between one rising portion and the corresponding second rising portion. Preferred. 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.

  In the first aspect of the present invention, the antenna formation target member is a shelf plate of an article placement shelf or a base plate of an article placement table, and a main component of the shelf board or the stand plate is Each of the first and second antennas can be made of a wire conductor having a cross-sectional diameter of 0.5 mm or less. Further, the first and second loop antennas can be provided between a pair of glass plates laminated with an insulating layer interposed therebetween.

  Furthermore, according to the second aspect of the present invention, there is provided an article with an 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 member. 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. According to a third aspect of the present invention, there is provided an article with an antenna, wherein the antenna forming target member includes a base plate on which the reader antenna according to the first aspect is formed. It is related to the table.

  According to the present invention, a magnetic field (magnetic flux) generated by a predetermined antenna component of an antenna pattern of a reader antenna is applied to a shelf board or the like by a conductive and porous sheet-like member configured in a loop shape. It is possible to weaken to a considerable extent only outside the antenna formation target member (specifically, the upper part of the antenna formation target member above a certain distance or the part other than the upper part of the antenna formation target member). Therefore, there is almost no possibility of interference between the reader antenna and another reader antenna adjacent thereto, and no wasteful space is generated in the article storage space. Nevertheless, since the conductive sheet-like member configured in the loop shape 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 be satisfactorily communicated with the electronic tag without making the electronic tag particularly complicated.

  According to the invention of claim 11, the magnetic field (magnetic flux) generated by the predetermined antenna component in the antenna pattern of the reader antenna is also caused by the second porous sheet-like member, the shelf board, etc. Since it is possible to further weaken only the outside of the antenna formation target member, the possibility of interference between the reader antenna and another reader antenna adjacent thereto is further reduced. .

  According to the invention of claim 13, the incommunicable area 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 provide an antenna for a reader that can satisfactorily communicate with electronic tags in various directions.

  According to the invention of claim 14, since it is possible to perform both writing to the electronic tag and reading from the electronic tag with a common antenna, the configuration of the entire reader / writer can be simplified. .

  According to the invention of claim 16, since the first and second loop antennas are provided between a pair of glass plates each having excellent weather resistance and chemical resistance, the reader antenna can be used in various environments. Even when used, it can be effectively protected. For this reason, since the weather resistance and chemical resistance of the reader antenna are improved, there is no risk of damage even if the reader antenna is provided on a chemical shelf or the like.

  Further, according to the inventions according to claims 17 and 19, there is almost no possibility of causing interference between the reader antenna and another reader antenna adjacent thereto, and no useless space is generated. In addition, although the reader antenna can be made relatively simple, the reader can communicate well with the electronic tag without making the electronic tag particularly complicated. An article placement shelf such as a bookshelf provided with an antenna and an article placement table can be provided.

  Next, the first to third embodiments in which the present invention is applied to the bookshelf search system are respectively described as “1, first embodiment”, “2, second embodiment”, “3, third embodiment”. The example is divided into “example” and “4, operation experiment of antenna for reader / writer”, 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) Interference prevention” The components will be divided into “members”, “(4) pattern shape of reader / writer antenna” and “(5) method of feeding power to reader / writer antenna” with reference to FIGS.

(1) Schematic Configuration of Entire Book Rack As shown in FIG. 1, the book rack 1 according to the first embodiment of the present invention is directed to the left side of the bookshelf part (ie, the first bookcase part) 2 and to the right side. The book rack part (that is, the second book rack part) 3 is configured to be adjacent to each other so as to share a common side plate 4. Each of the first and second bookshelf portions 2 and 3 is substantially a box composed of a left side plate 4 or 4a facing away, a right side plate 4a or 4 facing away, a back plate 5, a top plate 6 and a bottom plate 7. It has a lid shape (in other words, a substantially rectangular parallelepiped shape). The pair of left and right side plates 4, 4a, the back plate 5, the top plate 6 and the bottom plate 7 can be made of a suitable non-metallic material such as glass, synthetic resin, wood, etc., and the bottom plate 7 It also serves as a shelf board. Each of the first and second bookshelf portions 2 and 3 may further include a front plate (not shown) which is preferably made of a substantially transparent material such as glass or synthetic resin. The front plate may be, for example, a pair of left and right sliding door structures. Further, in the illustrated embodiment, the pair of left and right side plates 4, 4a are configured to slightly protrude downward from the bottom plate 7, and by the pair of left and right projections, the first and second bookshelf portions 2, 3 A pair of left and right support legs 8 and 8a are formed on each. In this case, the first and second bookshelf portions 2 and 3 have a common support leg 8a.

  Each of the first and second bookshelf portions 2 and 3 of the bookshelf 1 shown in FIG. 1 is, in the illustrated embodiment, a suitable non-metallic material such as glass, synthetic resin, wood (in other words, transparent or opaque The non-conductor) is a three-stage configuration including the uppermost shelf board 11, the second shelf board 12, and the lowermost shelf board 7. These shelves 7, 11, 12 have a pair of left and right side plates 4, 4a, and a back plate 5 by means of appropriate support means (not shown) at a pair of left and right side edges and / or a side edge on the back plate side. Can be supported.

  A reader / writer antenna 15 shown in FIGS. 2 and 3 is laid on each of the shelf boards 7, 11, 12 of the bookshelf 1 shown in FIG. 1 so as to be substantially parallel to the shelf board surface. . Then, the first and second loop antennas A and B of the reader / writer antenna 15 pass through a matching adjuster (not shown) and then an antenna switch (not shown) by a coaxial cable (not shown). Connected). The antenna switch is sequentially connected to the reader / writer main body 16 and a control computer (not shown) by a coaxial cable 17. The reader / writer main body 16 is for exchanging information such as electric signals with the reader / writer antenna 15. The reader / writer main body 16 can be arranged on the bookshelf 1 and is arranged on the top plate 6 of the second bookshelf portion 3 in the illustrated embodiment. The antenna switcher can be similarly arranged on the bookshelf 1 as necessary.

  Books 21 of various sizes are mixedly mounted on the shelf boards 7, 11, and 12 of the bookshelf 1 shown in FIG. These books 21 are each provided with an electronic tag 22 that may be in the form of a sheet, as shown in FIG. The electronic tag 22 may be attached to the front cover 23, back cover 24, or spine cover 25 of the books 21. In any of these cases, the electronic tag 22 does not have to be in a specific position or a specific direction with respect to the surfaces of the shelf boards 7, 11, and 12. As shown in FIG. 5, such an electronic tag 22 has a single-turn or multiple-turn small loop-shaped antenna 26 whose center substantially coincides with the center of the electronic tag 22, and information is recorded. And a communication circuit including an IC chip 27 in which a memory (not shown) to be incorporated is incorporated and arranged in the central opening of the small loop-shaped antenna 26 may be provided.

(2) Shelf with antenna for reader / writer Each shelf 7, 7, and 12 of the shelf 1 shown in FIGS. 1 and 2 has a length L ₁ (see FIG. 2) in the frontage direction x of about 840 mm and a depth, for example. The length L ₂ in the direction y (see FIG. 2) may be a substantially rectangular shape with a lateral length of about 170 mm. As shown in FIGS. 2 and 3, each shelf plate 7, 11, 12 is provided with a reader / writer antenna 15 including first and second loop antennas A, B. FIG. 2 is a plan view of, for example, the uppermost shelf 11 that projects both the first and second loop antennas A and B. The shelf boards 7 and 12 other than the shelf board 11 may be provided with reader / writer antennas 15 having substantially the same shape as the shelf board 11 shown in FIGS. A reader / writer antenna 15 may be provided in which one or both of the loop antennas A and B have a shape different from that of the shelf plate 11. In FIG. 2 and all similar drawings (including cases of second and third embodiments described later), for convenience of illustration, the first loop antenna A is shown by a solid line, The loop antenna B is indicated by a broken line. Further, the width of each pattern portion of the antenna patterns 31 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 31 of the first and second loop antennas A and B may be substantially the same as each other.

First and second loop antennas A and B of the reader / writer antenna 15 (specifically, a substantially loop-shaped antenna pattern 31 and a pair of terminal portions 32a shown in FIGS. 2, 6, 8, and 9) 3b and 7b), as shown in FIGS. 3 and 7, a conductive paint (for example, silver paste) is applied to two upper and lower plates 33 and 34 made of a suitable non-metallic material such as glass, synthetic resin, and wood. For example, with a width of about 5 mm. 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 attached and arranged by being bent into a predetermined pattern shape and then partially or entirely bonded to the plates 33 and 34 with an appropriate adhesive. Furthermore, as described above, the pair of terminal portions 32a and 32b of the first and second loop antennas A and B are formed of a conductive pattern formed by printing and baking a conductive paint. The substantially loop-shaped antenna pattern 31 may be made of a copper wire as described above. In this case, both end portions of the antenna pattern 31 may be electrically connected to the pair of terminal portions 32a and 32b by bonding or soldering with an appropriate conductive adhesive. Next, these plates 33 and 34 are bonded using an intermediate film 35 made of a non-conductive film such as PVB resin, so that the first and second loop antennas A and B have two upper and lower plates 33, 34. Each of these plates 33 and 34 may be, for example, a glass plate having a thickness of about 2.3 mm (specifically, a glass plate manufactured by a float process), and has a thickness L ₃ (see FIG. 3 and FIG. 7) may be about 300 μm, 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 or the like may be used.

  As shown in FIGS. 3 and 7, the first and second loop antennas A and B of the reader / writer antenna 15 configured as described above are electrically insulated from each other and of the shelf boards 7, 11, and 12, respectively. They are sandwiched between two glass plates 33 and 34 in a state of being substantially parallel to the surface (in other words, the loop antennas A and B are substantially parallel to each other). Therefore, the first and second loop antennas A and B are prevented from being scratched by contact with the books 21 placed on the shelf plates 7, 11 and 12. Moreover, since the glass plate which comprises the upper and lower surfaces of the shelf boards 7, 11, and 12 is excellent in water resistance, weather resistance, chemical resistance, etc., the bookshelf 1 shown in FIG. 1 should be used for various uses. Can do. And when the main component of the shelf boards 7, 11, and 12 is a transparent glass material, the reader / writer antenna 15 is also configured by the thin wire conductors as described above in which the intersections and the overlapping parts are insulated. be able to.

In the present invention, the distance L ₃ (see FIGS. 3 and 7) in the thickness direction of the two loop antennas A and B that are substantially parallel to each other is generally 0 from the viewpoint of practicality. 0.1 to 35 mm is preferable, and 0.2 to 30 mm is more preferable. However, this spacing L ₃ is smaller than 0.1 mm, 2 pieces of the loop antenna A, it may be any possible electrical isolation between the B. Further, if the distance _{L 3} is greater than 35 mm, 2 pieces of the loop antenna A, at least one loop antenna of B is provided in the book class 21 being placed on the shelf plate 7,11,12 electronic There is a risk that communication with the tag 22 is difficult.

  In the illustrated embodiment, the first and second loop antennas A and B of the reader / writer antenna 15 are embedded in the shelves 7, 11 and 12 as shown in FIGS. 3 and 7. Yes. However, at least one of the first and second loop antennas A and B may be similarly formed on the upper surface of the upper plate 33 of each shelf plate 7, 11, 12. Further, by turning each of the shelf boards 7, 11, 12 upside down and using the same as in the case of the shelf board without the shielding material shown in FIGS. At least one loop antenna may be formed on the lower surface of the lower plate 34 of each shelf plate 7, 11, 12. Further, one of the first and second loop antennas A and B is formed on the upper surface of the upper plate 33 of each shelf plate 7, 11, 12, and the other is placed under each shelf plate 7, 11, 12. It can also be formed on the lower surface of the side plate 34. In any of these cases, the intermediate film 35 is omitted when the plates 33 and 34, which are the main components of the shelf plates 7, 11, and 12, are interposed between the first and second loop antennas A and B. be able to. In some cases, the upper plate 33 and the lower plate 34 can be integrated. Further, when at least one of the first and second loop antennas A and B is formed on the upper surface of the upper plate 33 of each shelf plate 7, 11, 12, each shelf plate 7, In order to reduce the chance of coming into contact with the books 21 arranged on 11, 12, the upper surface of each shelf plate 7, 11, 12 including the at least one loop antenna is covered with a coating film made of a suitable insulating material. Can be coated.

  The respective terminals (that is, the pair of terminal portions 32a and 32b) of the first and second loop antennas A and B of the reader / writer antenna 15 can be processed as shown in FIGS. 8 and 9, for example. . That is, in the embodiment shown in FIGS. 8 and 9, locations corresponding to the pair of terminal portions 32 a and 32 b of the first and second loop antennas A and B of the pair of upper and lower plates 33 and 34 are defined. By making it lack beforehand, the lack parts 36 and 37 are formed in these places, respectively. Next, a pair of extraction electrodes 38a and 38b are attached and arranged on the lower surface of the upper plate 33 and the upper surface of the lower plate 34 by bonding them with an appropriate adhesive, respectively. In this case, as each of the pair of lead electrodes 38a and 38b of the first and second loop antennas A and B, a copper plate whose entire surface is solder-coated by solder plating or the like can be used. Moreover, each of such copper plates 38a and 38b may be a substantially rectangular shape having a length of 25 mm, a width of 10 mm, and a thickness of 0.1 mm, for example. Then, as described above, the substantially loop-shaped antenna pattern 31 of the first and second loop antennas A and B and the pair of terminal portions 32a and 32b are connected to the lower surface of the upper plate 33 and the lower plate 34. Formed on the upper surface of each. In this case, as shown in FIG. 8, at least a part of the pair of terminal portions 32a and 32b of the first and second loop antennas A and B is formed on the lower surface and the lower side of the pair of extraction electrodes 38a and 38b of the upper plate 33. It is formed on the upper surfaces of the pair of extraction electrodes 38a and 38b of the side plate 34, respectively. Then, the shelf plate 11 without a shielding material shown in FIGS. 6 and 7 can be configured by sequentially laminating the upper plate 33, the intermediate film 35, and the lower plate 34.

(3) Interference prevention member A conductive and porous sheet-like member 41 as a shielding material (in other words, an interference prevention member) is attached to the lower surface of the shelf plate 11 without the shielding material shown in FIGS. By this, the shelf board 11 with a shielding material shown in FIG. 2 and FIG. 3 can be manufactured. Such attachment can be achieved by, for example, partially or entirely bonding a conductive and porous sheet-like member 41 to the lower surface of the lower plate 34 of the shelf board 11 without a shielding material with an appropriate adhesive. Can be achieved. In this case, if the reader / writer antenna 15 is formed on the lower surface of the lower plate 34 of the shelf plate 11, an intermediate film similar to the intermediate film 35 shown in FIGS. What is necessary is just to interpose between the porous sheet-like members 41. Such an intermediate film 35 may be a film made of a suitable non-conductive material such as PET (polyethylene terephthalate), and may be previously bonded to one or both surfaces of the porous sheet-like member 41. . In FIG. 2 and all similar drawings (including cases of second and third embodiments described later), the porous sheet-like member 41 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 41 is, for example, _(in other words, 840 mm) length L ₁ in the frontage direction x of the shelf plate 11 and may be substantially identical. Moreover, the length of the depth direction y of the porous sheet-like member 41 may be substantially the same as the length L ₂ (in other words, 170 mm) in the depth direction y of the shelf board 11, for example.

As shown in FIG. 2, the porous sheet-like member 41 is configured in a closed loop shape having a central opening (that is, a through-opening) 42 formed by lacking a central portion in a substantially rectangular shape. The outer peripheral shape of the porous sheet-like member 41 may be a substantially rectangular shape, and the outer periphery of the reader / writer antenna 15 may be made slightly larger. Further, the inner peripheral shape of the porous sheet-like member 41 (in other words, the shape of the central opening 42) is also substantially rectangular, and the outer periphery of the reader / writer antenna 15 is at least slightly smaller in the depth direction y. It may be a thing. The ratio of the size of the central opening 42 to the size of the porous sheet-like member 41 (that is, the size including the central opening 42) (in other words, the opening of the porous sheet-like member 41 with respect to the central opening 42). The rate is about 50% in the illustrated embodiment. Further, the width of each side of the porous sheet-like member 41 (in other words, the shortest distance from each side of the four outer peripheral sides to the central opening 42) is about 35 mm (rear edge portion 52). Side edge), about 10 mm (side toward the left edge 54 side), about 35 mm (front edge 56 side), and about 25 mm (right edge 58 side).

  Therefore, the porous sheet-like member 41 has an overlapping portion overlapping the outer peripheral portion of the reader / writer antenna 15. In the present text, the term “overlap” does not electrically connect and overlap, but overlaps in a projection view of the antenna forming target member such as the shelf board 11 from the top (in other words, in plan view). It means that The overlapping state of the porous sheet-like member 41 with the reader / writer antenna 15 will be described in detail in the next section “(4) Pattern shape of reader / writer antenna”. Further, in the illustrated embodiment, the mutual distance between the porous sheet-like member 41 and the second loop antenna B (particularly, the antenna pattern 31) is as shown in FIG. The thickness is approximately equal to 2.3 mm. Further, the distance between the porous sheet-like member 41 and the first loop antenna A (particularly, the antenna pattern 31) is the thickness of the lower plate 34 (about 2.3 mm) as shown in FIG. The thickness of the second antenna pattern B and the thickness of the intermediate film 35 (about 300 μm) are approximately equal to about 3 mm.

In the first aspect, the conductive and porous sheet-like member 41 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 41 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 braided into 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. Accordingly, the vertical and horizontal lengths of the small holes (ie, the through holes) corresponding to the eyes of one grid may be, for example, about 280 μm. For this reason, the porous sheet-like member 41 The maximum length of the small apertures may be about 396 μm, for example, and the area per one of the small apertures may be about 78,400 μm ² , for example. The opening ratio of the portion excluding the opening 42 may be about 87%, for example. In the second embodiment, the conductive and porous sheet-like member 41 has a large number of small openings as in the case of the mesh structure formed on a conductive thin plate such as a thin plate made of stainless steel or other metal. It may be a thin plate having a micromesh structure such as a micromesh metal in which holes (that is, through-holes) are formed. And in any of the said 1st and 2nd aspect, the electroconductive porous sheet-like member 41 may consist of a magnetic material, and may consist of a nonmagnetic material. Furthermore, in any of the first and second aspects, the small opening formed in the porous sheet member 41 is substantially square, substantially rectangular, substantially rhombus, substantially trapezoidal, substantially hexagonal, It may be a 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 41 made of copper wire may be, for example, about 0.18Ω / □, but in the present invention, in general, from the viewpoint of practicality, The sheet resistance is preferably 0.5Ω / □ or less, and more preferably 0.3Ω / □ or less. These preferable numerical ranges and more preferable numerical ranges also apply to the porous sheet-like member 41 having the micromesh structure.

In any of the first and second aspects (in other words, in the present invention), the porous sheet-like member 41 is generally the following items (a) to ( It is preferable that one, a plurality or all of the numerical ranges described in the item (c) are satisfied. 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 42 to the size of the porous sheet-like member 41 (that is, the size including the central opening 42): a range of 20 to 80% (30 to 70%);
(A) the width of one side of the porous sheet-like member 41: a range of 2 to 80 mm (4 to 60 mm);
(C) The distance between the porous sheet-like member 41 and the first loop antenna A (particularly, the antenna pattern 31) and the porous sheet-like member 41 and the second loop antenna B (particularly, the antenna pattern 31). ) (In other words, the mutual distance between the porous sheet-like member 41 and the reader / writer antenna 15 (particularly, the antenna pattern 31)): 0.5 to 30 mm (1 to 15 mm) Range,
(D) The maximum line width of the conductive linear member of the porous sheet-like member 41 when the porous sheet-like member 41 is a braided conductive linear member (if the cross section is substantially circular) , Wire diameter): in the range of 4 to 200 μm (8 to 100 μm),
(E) Pitch of small openings of the porous sheet-like member 41 (specifically, when the sheet-like member 41 is a braided conductive strip formed in a mesh shape, the mesh pitch): 50 to 2,000 μm (100 to 1,200 μm) range,
(F) Maximum length of each small opening of the porous sheet-like member 41: a range of 60 to 3,000 μm (120 to 1,600 μm),
(G) Area per one of a large number of small openings in the porous sheet-like member 41: a range of 4,000 to 1,800,000 μm ² (8,000 to 800,000 μm ² ), and (ku) The aperture ratio of the porous sheet-like member 41 excluding the central aperture 42 (in other words, the aperture ratio for a large number of small apertures): in the range of 70 to 95% (80 to 92%).

(4) Pattern Shape of Reader / Writer Antenna The reader / writer antenna 15 for communicating with the electronic tag 22 provided in the books 21 by wireless communication is as shown in FIG. 2, FIG. 3, FIG. 6, 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 31 and a pair of terminals that are connected to both ends of the substantially loop-shaped antenna pattern 31 and are close to each other. It consists of parts 32a and 32b. Since the gap 51 is provided between the pair of terminal portions 32 a and 32 b, the gap 51 is also present between the both ends of the substantially loop-shaped antenna pattern 31. The pair of terminal portions 32a and 32b may be connected to the matching adjuster (not shown) by a twist cable (not shown).

  The substantially loop-shaped antenna patterns 31 of the first and second loop antennas A and B constituting the reader / writer antenna 15 shown in FIGS. 2, 3, 6 and 7 are shown in FIGS. As shown in FIG. 6, 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 31 of each of the first and second loop antennas A and B is provided with a terminal portion 32a for feeding or the like as necessary, and on the rear edge portion 52 side of the shelf board 11. The first pattern portion 53 that is positioned, the second pattern portion 55 that is positioned on the left edge portion 54 side toward the shelf board 11, and the front edge portion of the shelf board 11 (in other words, the books 21 A third pattern portion 57 located on the side of the take-out side 56) and a terminal portion 32a and / or 32b for power feeding or the like are connected as necessary, and the right-side edge portion toward the shelf board 11 The fourth pattern portion 59 located on the side of 58 may be sequentially connected, and as a whole, it is configured in a loop shape except for the corresponding gap 51 between the pair of terminal portions 32a and 32b. 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 and intersect, but intersects in a projection view (in other words, a plan view) of the antenna forming target member such as the shelf board 11 as viewed from above. It means that

  As shown in FIGS. 2 and 6, the first pattern portion 53 of the first loop antenna A is slightly separated from the rear edge portion 52 of the shelf board 11 and substantially parallel to the rear edge portion 52 (in other words, For example, in a state substantially parallel to the opening direction x of the shelf board 11, in the illustrated embodiment, it extends substantially over the entire length of the opening direction x of the shelf board 11 in a substantially linear manner. Yes. The second pattern portion 55 of each of the first and second loop antennas A and B is close to the left side edge 54 toward the shelf plate 11 or a certain distance from the left side edge 54 and substantially parallel to the left side edge 54. Each extends in a state (in other words, in a state substantially parallel to the depth direction y of the shelf board 11 and in the illustrated embodiment, substantially linear—the same applies hereinafter). The third pattern portion 57 of the second loop antenna B is close to the front edge portion 56 of the shelf board 11 and substantially parallel to the front edge portion 56 (in other words, in the opening direction x of the shelf board 11). In a substantially parallel state), the shelf plate 11 extends over almost the entire length in the opening direction x. The fourth pattern portion 59 of each of the first and second loop antennas A and B has a gap between the portion on the rear end portion 52 side or the middle portion in the front-rear direction for connection of the terminal portions 32a and / or 32b. 51, except for being interrupted by 51, to a certain degree or slightly away from the right edge 58 toward the shelf 11 and substantially parallel to the right edge 58 (in other words, the depth direction of the shelf 11). in a state substantially parallel to y).

  The third pattern portion 57 of the first loop antenna A is in a state slightly separated from the front edge portion 56 of the shelf board 11 and substantially parallel to the front edge portion 56 (in other words, in the opening direction x of the shelf board 11). (In a substantially parallel state) a plurality of (5 in the illustrated embodiment) baseline portions 62 intermittently extending so that an intermittent portion 61 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 62 (in other words, the intermittent portion 61). ) Bent portions 63. Each baseline portion 62 is a virtual center line (hereinafter referred to as “antenna center line”) of the reader / writer antenna 15 that extends in the opening direction x of the shelf 11 along the center in the depth direction y of the reader / writer antenna 15. That is, the rear edge 52 side of the third pattern portion 57 of the second loop antenna B extends on the front edge 56 side of 64. The first pattern portion 53 of the second loop antenna B is separated from the rear edge portion 52 of the shelf board 11 to some extent and substantially parallel to the rear edge portion 52 (in other words, the direction of the front edge of the shelf board 11). a plurality of (in the illustrated embodiment, five) baseline portions 62 that intermittently extend so that an intermittent portion 61 is generated between them, and these intermittent portions. One or a plurality (preferably a plurality of, preferably a plurality of) exist in each of the plurality of baseline portions 62 (in other words, the intermittent portion 61) extending in the illustrated embodiment. 4) bent portions 63. Each base line portion 62 extends on the rear edge portion 52 side of the antenna center line 64 on the front edge portion 56 side of the first pattern portion 53 of the first loop antenna A. In the illustrated embodiment, the virtual center line (that is, the shelf center line) of the shelf 11 extending in the front direction of the shelf 11 along the center line in the depth direction y of the shelf 11 is: It almost coincides with the antenna center line 64.

  As shown in FIGS. 2 and 6, each bent portion 63 of the first loop antenna A has a base end portion connected to the right end portion of the left base line portion 62 and a shelf plate. 11, a first rising portion 65 rising substantially toward the rear edge portion 52, and a base plate connected to the left end portion of the right base line portion 62, and a shelf board. 11 is substantially parallel to the frontage direction x so as to connect the second rising portion 66 rising substantially toward the rear edge portion 52 and the leading ends of the first and second rising portions 65 and 66, respectively. It is preferable that the connecting portion 67 extends and is a substantially rectangular convex portion as a whole. In this case, the connecting portion 67 is substantially on the front edge portion 56 side of the first pattern portion 53 of the first loop antenna A on the side of the rear edge portion 52 of the shelf board 11 from the antenna center line 64 in the frontage direction x. It is preferred that they extend in parallel. Accordingly, the first and second rising portions 65 and 66 are separated from one side of the shelf 11 (specifically, the portion on the front edge portion 56 side of the shelf 11) divided into two by the antenna center line 64. It is preferable to extend so as to be substantially orthogonal to the antenna center line 64 to the side (specifically, the portion on the rear edge 52 side of the shelf board 11).

  As shown in FIGS. 2 and 6, each bent portion 63 of the second loop antenna B has its base end portion connected to the right end portion of the left base line portion 62 and a shelf plate. 11, the first rising portion 65 rising substantially toward the front edge portion 56, and the base end portion of the right side toward the right base line portion 62. Of the second rising portion 66 rising substantially toward the front edge portion 56 and the leading ends of the first and second rising portions 65 and 66 are connected substantially parallel to the frontage direction x. It is preferable that it is a substantially rectangular convex part as a whole. In this case, the connecting portion 67 is substantially on the rear edge portion 52 side of the third pattern portion 57 of the second loop antenna B on the side of the front edge portion 56 of the shelf board 11 from the antenna center line 64 in the frontage direction x. It is preferred that they extend in parallel. Therefore, the first and second rising portions 65 and 66 are separated from one side of the shelf 11 (specifically, the portion on the rear edge 52 side of the shelf 11) divided into two by the antenna center line 64. It is preferable to extend so as to be substantially orthogonal to the antenna center line 64 up to the side (specifically, the portion on the front edge portion 56 side of the shelf plate 11).

  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 31 of the first loop antenna A, except that the second loop antenna B is symmetric with respect to the antenna center line 64 as an axis of symmetry. The antenna pattern 31 has a shape, and only the position of the pair of terminal portions 32a and 32b 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. 2 and 6. In this combination, the second loop antenna B is approximately ½ of the distance L ₄ (see FIG. 6) corresponding to the length of the connecting portion 67 in the frontage direction x with respect to the first loop antenna A. In other words, the length of the first or second rising portions 65 and 66 in the depth direction y is approximately 0.5L ₄ and is shifted to the right side by about 45 mm in the illustrated embodiment. The distance L ₅ (see FIG. 6) corresponding to is approximately 1/8 (that is, approximately 0.125L ₅ and approximately 15 mm in the illustrated embodiment).

The covering portion where the conductive and porous sheet-like member 41 covers the reader / writer antenna 15 from the lower surface side of the shelf board 11 (in other words, the overlapping portion of both) is the embodiment shown in FIG. Is as described in the following items (a) to (ki).
(A) the first pattern portion 53 of the first loop antenna A and the third pattern portion 57 of the second loop antenna B;
(A) Baseline portions 62 of the first and second loop antennas A and B,
(C) the connecting portion 67 of each of the first and second loop antennas A and B;
(D) Front and rear end portions of the second pattern portion 55 of each of the first and second loop antennas A and B;
(E) Front and rear ends of the fourth pattern portion 59 of each of the first and second loop antennas A and B,
(F) Both front and rear end portions of the first and second rising portions 65 and 66 of the first and second loop antennas A and B, and (g) the first and second loop antennas A and B, respectively. A pair of terminal portions 32a and 32b.

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 porous sheet-like members. 41 is preferred. Further, in the present invention, from the viewpoint of practicality, one, a plurality, or all of the antenna portions described in the following (ku) to (sa) items are generally porous. It can be covered with the sheet-like member 41.
(H) the second pattern portion 55 of the first loop antenna A,
(K) the fourth pattern portion 59 of the second loop antenna B,
(E) a second pattern portion 55 of the second loop antenna B, and (sa) a fourth pattern portion 59 of the first loop antenna A.

  As described above, in the reader / writer antenna 15, the antenna component (that is, the antenna component 31 extending along the frontage direction x of the antenna patterns 31 of the first and second loop antennas A and B) (that is, Magnetic fields (magnetic fluxes) generated by the antenna components described in the items (a) to (c) are weakened to a considerable extent by the porous sheet-like member 41. In particular, as described in the above item 1 (3), the side of the porous sheet-like member 41 on the rear edge portion 52 side is relatively wide (that is, about 35 mm). Therefore, even when a second bookshelf similar to the bookshelf 1 shown in FIG. 1 is arranged back to back on the bookshelf 1 shown in FIG. 1, the reader / writer antenna 15 of the bookshelf 1 shown in FIG. There is little possibility of interference between the two reader / writer antennas of the two shelves. The antenna components extending along the depth direction y of the antenna patterns 31 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 55, 59, 65, and 66) function effectively for mutual communication between the electronic tag 22 attached to the books 21 and the reader / writer antenna 15. Therefore, in the illustrated embodiment, in order to allow the electronic tag 22 to communicate with the reader / writer antenna 15 satisfactorily, the electronic tag 22 is attached to the front cover 23 or the back cover 24 of the books 21 (in particular, the lower end thereof). It is preferable that it is provided on the side.

  According to the bookshelf portions 2 and 3 (and hence the bookshelf 1) using the shelves 7, 11, and 12 on which the reader / writer antenna 15 is laid as shown in FIGS. As described above, since a large number of shelf boards can be provided in each of the bookshelf portions 2 and 3, the article storage space of the bookshelf portions 2 and 3 can be used effectively.

  That is, as described in the above section (D), according to the bookshelf search system described in Patent Documents 1 to 3, since there is a high possibility of mutual interference between shelf boards adjacent to each other in the vertical direction, The space between adjacent shelves needs to be increased, which results in a poor space factor. In other words, an electronic tag attached to a book placed on another shelf board reacts by receiving a magnetic field emitted from the reader / writer antenna that is feeding power 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 the conventional bookshelf to which the bookcase search system disclosed in Patent Document 1 is applied, even if it is a weekly magazine of A4 size (height 29.7 mm) among the books 21, A6 Even in the case of a paperback book of a size (height 14.8 mm), it is necessary to leave the space between the upper and lower shelf boards 7, 11, 12 of the bookcase portion 2 by substantially the same. For this reason, in the case of a paperback book, as compared with the case of a weekly magazine, about twice as much extra space is required, so the capacity of the books 21 in the bookshelf portions 2 and 3 (and hence the bookshelf 1) is large. Cause problems.

  On the other hand, the first and second loop antennas A are used in the bookshelf portions 2 and 3 where the shelf plates 7, 11 and 12 on which the reader / writer antenna 15 shown in FIGS. 2 and 3 is laid are used. The partially strong magnetic field (magnetic flux) generated by each of the antenna patterns 23 of B and B is weakened to a considerable extent by the porous sheet-like member 51. Therefore, there is little possibility that the reader / writer antenna 15 of, for example, the shelf board 12 of the bookshelf portion 3 shown in FIG. 1 interferes with the reader / writer antennas 15 of the upper and lower shelf boards 11 and 7. . Therefore, unlike the case of the bookshelf in Patent Document 1, it is not particularly necessary to make the interval between the shelf boards relatively large. And it is possible to make the space | interval of the top 28 (refer FIG. 4) of the books 21 and the shelf board immediately above it substantially constant irrespective of the size of the books 21 in particular. Therefore, in the case of the shelves 7, 11, and 12 on which only A6 size paperback books are placed, the distance from the upper shelf is compared with the shelf on which only A4 size weekly magazines are placed. Can be set at a substantially constant interval (for example, 10 mm or more) and can be made sufficiently small. As a result, since no extra space is required on the shelf board on which only the A6 size paperback book is placed, even if it is the same size as the bookshelf of Patent Document 1 having the three-stage shelf boards 7, 11, and 12, In the case of the bookshelf portions 2 and 3 in which the shelf plates 7, 11, and 12 on which the reader / writer antenna 15 shown in FIGS. 2 and 3 is laid are used, the shelves 7 and 11 of the bookshelf portions 2 and 3 are used. , 12 can be increased to four or more stages. For this reason, in the case of the bookshelf portions 2 and 3 in which the shelves 7, 11, and 12 on which the reader / writer antenna 15 shown in FIGS. 2 and 3 is laid, the bookshelf portion 2 of Patent Document 1 is used. 3 can store a large number of books 21.

  Since it is as above-mentioned, the shelf boards 7, 11, and 12 (except the shelf board 7 also used as a baseplate as needed) shown in FIG. 1 are left and right by an appropriate shelf board support (not shown). The pair of side edges and / or the side edge on the back plate 5 side is preferably supported by the pair of left and right side plates 4, 4a and / or the back plate 5. The shelf board support is configured separately from the pair of left and right side plates 4, 4 a and / or the back plate 5 and is detachable from the pair of left and right side plates 4, 4 a and / or the back plate 5. And it is preferable that it is each attached so that the attachment position in an up-down direction can be changed continuously or in steps. Moreover, the said shelf board support may be comprised integrally with the shelf boards 7, 11, and 12, and may be comprised separately so that these shelf boards 7, 11, and 12 can be supported. Good. For this reason, the shelf boards 7 and 11 can change the attachment position in the up-down direction between the top plate 6 and the bottom plate 7 continuously or stepwise. Therefore, the space | interval of each shelf board 7, 11, 12 and the space | interval of the top plate 6 and the uppermost shelf board 11 can be changed continuously or in steps.

(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 19 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 further stabilized with the electronic tag 19. Good communication can be achieved.

2. Second Embodiment In the bookshelf 1 in the second embodiment shown in FIGS. 10 and 11, as a member for preventing interference (in other words, a shielding material) provided on the shelves 7, 11, 12, 2 and FIG. 3, in addition to the conductive and porous first sheet-like member 41 configured in a loop shape as in the case of the first embodiment shown in FIG. 3, the conductive and porous material configured in a non-loop shape. The 2nd sheet-like member 71 of property is provided. Note that the bookshelf 1 in the second embodiment shown in FIGS. 10 and 11 may have substantially the same configuration as the bookshelf 1 in the first embodiment described above, except for the points described below. The books 21 in the second embodiment may have substantially the same configuration as the books 21 in the first embodiment described above. Therefore, in FIG. 10 and FIG. 11, the same reference numerals are given to portions common to FIG. 1 to FIG. 9, and description thereof is omitted as necessary. In the following description, only the uppermost shelf plate 11 will be described, but the remaining shelf plates 7 and 12 may have substantially the same configuration as the shelf plate 11 or different configurations as necessary. It may be.

  In the shelf board 11 shown in FIG. 10 and FIG. 11, as a member for preventing interference (in other words, a shielding material), a central opening 42 and a cut are provided separately from the first porous sheet member 41 configured in a loop shape. The 2nd porous sheet-like member 71 which does not have any is provided. Such a second porous sheet-like member 71 is described in the section 1 (2) on the lower surface (in other words, the outer surface) of the first porous sheet-like member 41 as shown in FIG. It can be attached, for example, by bonding using a second intermediate film 72 which may be similar to the intermediate film 35. In FIG. 10 and similar drawings (in other words, FIG. 12 for a third embodiment to be described later), the second porous sheet-like member 71 is indicated by a two-dot chain line for convenience of illustration. Yes.

  The second porous sheet-like member 71 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 71 is formed in a substantially rectangular shape as shown in FIG. The length in the depth direction of the second porous sheet-like member 71 is, for example, the length in the depth direction y of the first porous sheet-like member 41 (in other words, in the depth direction y of the shelf board 11). Length—ie about 170 mm). In addition, the length (in other words, the width) of the second porous sheet-like member 71 in the opening direction x may be about 55 mm, for example.

  The second porous sheet-like member 71 has an end on the left side substantially coincided with an end on the left side of the first porous sheet-like member 41, and a front end portion and a rear end portion thereof are the first end portions. The porous sheet-like member 41 is overlaid on the first porous sheet-like member 41 through the second intermediate film 72 so as to substantially coincide with the front end portion and the rear end portion, respectively. Such a second intermediate film 72 may be a film made of a suitable non-conductive material such as PET, and may be previously bonded to one or both surfaces of the second porous sheet-like member 71. . In other words, the left porous end of the second porous sheet-like member 71 is substantially overlapped with the first porous sheet-like member 41. Therefore, the second porous sheet-like member 71 does not overlap with the second pattern portion 55 of the second loop antenna B as shown in FIG. Pattern portion 55, the pattern portion near the left end of the first pattern portion 53 of the first loop antenna A, and the pattern near the left end of the leftmost baseline portion 62 of the first loop antenna A. And overlaps with the protruding portion on the left side in the vicinity of the left edge 54 and protruding in a substantially U-shape. In other words, the second porous sheet-like member 71 at least partially overlaps with the vicinity of the left end portion of the first porous sheet-like member 41. Further, the second porous sheet-like member 71 may be of the same material and composition as the first porous sheet-like member 41 described in the above section 1 (3). And the 2nd porous sheet-like member 71 is generally said from the viewpoint of practical use, and the said (c) item | item described about the 1st porous sheet-like member 41 in said 1 (3) item | 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 (v) (including more preferable numerical ranges) are satisfied.

  As described above, in the reader / writer antenna 15 in the second embodiment shown in FIGS. 10 and 11, the first loop antenna is more effective than in the first embodiment shown in FIGS. A magnetic field (magnetic flux) generated in the substantially U-shaped left protruding portion 55, 53, 62 of A is not only generated by the first porous sheet-like member 41 but also the second porous sheet member. It is further weakened by 71. Nevertheless, for the books 21 placed on the shelf 11, the mutual communication between the electronic tag 22 attached to the books 21 and the reader / writer antenna 15 is also effective over the entire shelf 11. Can be done.

3. Third Example The mounting position of the second porous sheet-like member 71 as the second interference preventing member (in other words, the shielding material) is the second example shown in FIGS. However, the present invention is not limited to this, and various changes and modifications can be made as exemplified by the third embodiment shown in FIGS. The bookshelf 1 in the third embodiment shown in FIGS. 12 and 13 may have substantially the same configuration as the bookshelf 1 in the second embodiment described above, except for the points described below. Further, the books 21 in the third embodiment may have substantially the same configuration as the books 21 in the first embodiment described above. Therefore, in FIG. 12 and FIG. 13, the same reference numerals are given to portions common to FIG. 1 to FIG. In the following description, only the uppermost shelf plate 11 will be described, but the remaining shelf plates 7 and 12 may have substantially the same configuration as the shelf plate 11 or different configurations as necessary. It may be.

  12 and 13, the second porous sheet-like member 71 in the shelf 11 in the third embodiment is compared with the shelf 11 in the second embodiment shown in FIGS. 10 and 11. For example, the gap is approximately 10 mm from the left side to the right side, substantially along the frontage direction x. Therefore, the second porous sheet-like member 71 not only overlaps with the substantially U-shaped left protruding portions 55, 53, 62 described in the above item 2, but also the second loop antenna B second. The pattern portion 55 also overlaps.

  As described above, in the reader / writer antenna 15 in the third embodiment shown in FIGS. 12 and 13, the first loop antenna is more effective than in the second embodiment shown in FIGS. 10 and 11. Not only the magnetic field (magnetic flux) generated by the substantially U-shaped left protruding portions 55, 53, 62 of A but also the magnetic field generated by the second pattern portion 55 of the second loop antenna B (A). The magnetic flux) is weakened not only by the first porous sheet member 41 but also by the second porous sheet member 71. Nevertheless, for the books 21 placed on the shelf 11, the mutual communication between the electronic tag 22 attached to the books 21 and the reader / writer antenna 15 is also effective over the entire shelf 11. Can be done.

4. Operation Experiment of Reader / Writer Antenna FIG. 14 shows an antenna center line 64 corresponding to the position (horizontal axis) in the frontage direction x of the reader / writer antenna 15 of the first to third embodiments with the electronic tag 22. The maximum communicable distance (vertical axis) in an upward direction (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 11 to the lower side of the electronic tag 22 facing upward along the upward direction. Specifically, the maximum communicable distance is the yz plane (in other words, the books 21 of the books 21 when the front direction of the shelf 11 is the x direction, the depth direction is the y direction, and the vertical direction is the z direction). The maximum communicable distance (height from the shelf board 11 to the lower side of the electronic tag 22) in the z direction of the electronic tag 22 parallel to the front cover surface 23 or the back cover surface 24) is measured. And the height direction (vertical axis) in FIG. 14 has shown the maximum communicable distance in the up-down direction of the shelf board 11 according to the position of the frontage direction x. Further, a negative area at the position (horizontal axis) in the frontage direction x indicates a reading range outside the left side of the shelf 11.

  In FIG. 14, the line graph of the reference example 1 is for the reader / writer antenna 15 of the shelf board 11 without the shielding material shown in FIGS. 6 and 7 in the first embodiment described in the above item 1. The line graph of Example 1 is for the reader / writer antenna 15 of the shelf board 11 with the shielding material shown in FIGS. 2 and 3 in the first example described in the above item 1. Further, the line graph of Example 2 is for the reader / writer antenna 15 of the shelf board 11 with the shielding material shown in FIGS. 10 and 11 in the second example described in the above item 2. Further, the line graph of Example 3 is for the reader / writer antenna 15 of the shelf board 11 with the shielding material shown in FIGS. 12 and 13 in the third example described in the above section 3.

FIG. 14 is described so as to correspond to the bookshelf 1 shown in FIG. And in this FIG. 14, the code | symbol 4a has shown the common side plate 4a shown in FIG. Further, in FIG. 14, the two reference numerals 59 on the left side of the common side plate 4a are the fourth loop antenna A of the first loop antenna A provided on the shelf plate 11 of the first bookshelf portion 2 shown in FIG. A center line (solid line) in the width direction of the pattern portion 59 and a center line (broken line) in the width direction of the fourth pattern portion 59 of the second loop antenna B are respectively shown. Further, in FIG. 14, two codes 55, two codes 65, two codes 66, and one code 65 from the left side to the right side of the common side plate 4a are shown in FIG. The center line in the width direction of the thing as described in the following (a) term-(d) term provided in the shelf board 11 of the 2nd bookshelf part 3 to show is shown, respectively.
(A) the second pattern portion 55 (solid line) of the first loop antenna A and the second pattern portion 55 (broken line) of the second loop antenna B;
(B) The first rising portion 65 (solid line) of the leftmost bent portion 63 facing the first loop antenna A and the first of the leftmost bent portion 63 facing the second loop antenna B Rising portion 65 (broken line),
(C) The second rising portion 66 (solid line) of the leftmost bent portion 63 toward the first loop antenna A and the second of the leftmost bent portion 63 toward the second loop antenna B Rising portion 66 (broken line), and (d) a first rising portion 65 (solid line) of the second bent portion 63 from the left side toward the first loop antenna A.

FIG. 14 shows the maximum communicable distance (maximum in the upward direction as described above) when the first and second antennas A and B of the reader / writer antenna 15 of only the second bookshelf portion 3 are alternately fed. Communication distance). Then, from the graph of the maximum communicable distance shown in FIG. 14, items described in the following items (a) to (e) can be understood.
(A) In the case of the shelf board 11 as Reference Example 1 shown in FIGS. 6 and 7, when the reader / writer antenna 15 of the second bookshelf part 3 is supplied with power, the reader of the second bookcase part 3 A magnetic field (magnetic flux) generated by the writer antenna 15 is generated by the reader / writer antenna 15 of the first bookshelf portion 2 adjacent to the left side of the writer antenna 15 or the reader / writer antenna 15 of the shelf on the upper level. Interfere with the magnetic field (magnetic flux)
(A) In the case of the shelf board 11 in the first embodiment shown in FIGS. 2 and 3, the interference described in the above item (a) is not generated to a considerable extent.
(C) In the case of the shelf board 11 in the second embodiment shown in FIGS. 10 and 11, the interference described in the above item (a) is greater than in the case of the first embodiment shown in FIGS. That will no longer occur,
(D) In the case of the shelf board 11 in the third embodiment shown in FIGS. 12 and 13, the interference described in the above item (a) is greater than in the case of the second embodiment shown in FIGS. And (e) the first embodiment shown in FIGS. 2 and 3, the second embodiment shown in FIGS. 10 and 11, and FIGS. 12 and 13. In any case of the shelf board 11 in the third embodiment, the electronic tag 22 attached to the books 21 over the entire shelf board 11 with respect to the books 21 placed on the shelf board 11. Mutual communication with the reader / writer antenna 15 can also be effectively performed.

  FIG. 15 shows the maximum in the depth direction y according to the position in the frontage direction x of the reader / writer antenna 15 of the first and third embodiments with the electronic tag 22 (specifically, the lower side portion of the electronic tag 22). The communicable distance (vertical axis) is shown. In this case, the maximum communicable distance is rearward along the depth direction y from the rear edge 52 of the shelf board 11 (in other words, the rear edge of the first and second porous sheet-like members 41 and 71). The distance toward is shown. In FIG. 15, each of Reference Example 1 and Examples 1 to 3 means the same as in FIG. 14. Further, in FIG. 15, reference numerals 59, 4 a, 55, 65 and 66 mean the same as in FIG. 14.

FIG. 15 shows the maximum communicable distance when power is alternately supplied to the first and second antennas A and B of the reader / writer antenna 15 of the second bookshelf portion 3 (maximum communicable in the depth direction y as described above). Distance). Then, from the graph of the maximum communicable distance shown in FIG. 15, the items described in the following items (F) and (K) are found.
(F) In the case of the shelf 11 as Reference Example 1 shown in FIGS. 6 and 7, when power is supplied to the reader / writer antenna 15 of the second bookcase portion 3, the reader of the second bookcase portion 3 A magnetic field (magnetic flux) generated by the writer antenna 15 is generated by the reader / writer antenna 15 (especially, the end in the frontage direction x) on the shelf of the shelf part of another shelf adjacent to the back side thereof. And (g) the shelf 11 in the first embodiment shown in FIGS. 2 and 3, the shelf in the second embodiment shown in FIGS. 10 and 11. 11 and each of the shelf boards 11 in the third embodiment shown in FIGS. 12 and 13, the interference described in the item (f) is not generated to a considerable extent.

FIG. 16 shows a graph similar to that of FIG. 14 for Reference Example 2. This reference example 2 uses the thing which abbreviate | omitted the center opening 42 of the porous sheet-like member 41 in the 1st Example shown in FIG. 2 and FIG. 3 as an interference prevention member. Therefore, in the case of the porous sheet-like member 41 of the reference example 2, the portion corresponding to the central opening 42 is also configured in a mesh structure. Then, from FIG. 16, the matters described in the following items (c) and (c) can be understood.
(H) In the case of the shelf 11 shown as the second reference example, the power is supplied to the reader / writer antenna 15 of the second bookcase portion 3 when the power is supplied to the reader / writer antenna 15 of the second bookcase portion 3. The magnetic field (magnetic flux) to be generated hardly interferes with the magnetic field (magnetic flux) generated by the reader / writer antenna 15 of the first shelf portion 2 adjacent to the left side of the magnetic field (magnetic flux). In the case of the shelf board 11, it is necessary to have some contrivance to allow the electronic tag 22 attached to the books 21 and the reader / writer antenna 15 to communicate with each other satisfactorily.

FIG. 17 shows a graph similar to that in FIG. 14 for Reference Example 3. This reference example 3 is the same as the third embodiment shown in FIGS. 12 and 13, except that the first porous sheet-like member 41 is omitted and only the second porous sheet-like member 71 is used as an interference preventing member. Used. Then, from FIG. 17, the matters described in the next item (c) can be understood.
(E) In the case of the shelf 11 shown as the reference example 3, when power is supplied to the reader / writer antenna 15 of the second bookcase portion 3, the reader / writer antenna 15 of the second bookcase portion 3 The generated magnetic field (magnetic flux) does not slightly interfere with the magnetic field (magnetic flux) generated by the reader / writer antenna 15 of the first bookcase portion 2 adjacent to the left side of this, but basically, FIG. In addition, almost the same graph as in the case of Reference Example 1 shown in FIG. 7 (shown in FIG. 14) should be obtained.

FIG. 18 shows a graph similar to that of FIG. 14 for Reference Example 4. This reference example 4 is different from the first embodiment shown in FIGS. 2 and 3 in that the porous sheet-like member 41 is provided with a lacking portion so that the porous sheet-like member 41 is not in a closed loop shape but in an open loop shape. It is configured. Specifically, the lacking portion is formed as a slit having a width of about 7.5 mm on the side of the right edge portion 58 toward the porous sheet-like member 41. Then, from FIG. 18, the items described in the next item (S) can be understood.
(S) In the case of the shelf 11 shown as the reference example 4, the interference substantially the same as that described in the above item (a) in the case of the reference example 1 shown in FIGS. 6 and 7 (shown in FIG. 14). To occur.

Table 1 below shows the maximum communicable distance shown in FIGS. 14 to 18 by adding the average value of the maximum communicable distance on the shelf board 11 (the positive area at the position in the frontage direction x). It is shown as a table. In Table 1, in the vertical direction, the maximum value, the average value, and the minimum value of the maximum communicable distance (vertical axis) in FIGS. 14 and 16 to 18 are shown. Further, in the case of the left-right direction (that is, the frontage direction) x, the maximum communicable distance in the direction from 0 mm to −100 mm at the position in the frontage direction (horizontal axis) in FIGS. 14 and 18 to 18 is shown. Yes. In the case of the front-rear direction (that is, the depth direction) y, the maximum communicable distance in FIG. 15 is shown.

Table 2 below shows the reader / writer antenna 15 between the shelves when the reader / writer antennas 15 laid on the shelves 7, 11 and 12 are arranged adjacent to each other in the vertical and horizontal directions. The minimum required distance between shelves necessary to prevent mutual interference by the antenna 15 is shown. That is, the distance in each direction necessary to prevent mutual interference between the adjacent upper and lower, left and right and front and rear shelf plates (specifically, the top plate 6 and the shelf plate in the vertical direction). 7, 11, and 12, the thickness of the side plate 4 a in the left-right direction, and the thickness of the back plate 5 in the front-rear direction).

From the above Tables 1 and 2, the matters described in the following items (1) and (2) can be understood.
(H) The minimum required separation distance shown in Table 2 is in a relationship that substantially corresponds to the maximum communicable distance shown in Table 1, and (x) In the case of Examples 1 to 3, the case of Reference Example 1 Compared to the above, it is possible to reduce the necessary minimum separation distance in the vertical and horizontal directions and in the forward and backward directions (in particular, in the vertical direction, in Reference Example 1, many paperback books 21 (height 148 mm) are arranged on a certain shelf board. When the books are arranged, it is necessary to provide an extra space more than double the height of the paperback book between the paperback book 21 and the shelf on the next upper level. It is possible to arrange a large number of paperback books on the shelf so that there is almost no extra space and there are not many gaps in the vertical direction).

  Although the first to third 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 third embodiments described above, the upper and lower shelf boards 7, 11, and 12 are provided on the bookshelf 1, but the shelf boards do not necessarily need to be provided in the upper and lower three stages. Another stage having four or more stages may be provided above and below, and in some cases, only one stage may be provided.

  Further, in the first to third embodiments described above, the bookshelf 1 is composed of the first and second bookshelf portions 2 and 3 that are adjacent to each other in the left-right direction. However, the bookshelf 1 may be composed of three or more bookshelf portions that are sequentially adjacent in the left-right direction, and may be composed of two or more bookshelf portions that are adjacent back to back in the front-rear direction. Good. The plurality of bookshelf portions adjacent to each other are not necessarily adjacent to each other in the left-right direction and / or the front-rear direction, and may be adjacent to each other in an oblique direction.

  In the first to third embodiments described above, the heights of the shelves 7, 11, 12 corresponding to each other of the first and second bookshelf portions 2, 3 are substantially the same. However, the height of at least one of the shelves 7, 11, 12 corresponding to each other of the first and second bookshelf portions 2, 3 may be different from each other.

  In the first to third embodiments described above, the present invention is applied to the bookshelf 1. However, according to the present invention, various articles such as a display shelf, a product shelf, a document management shelf, a counter stand such as a library reception counter stand, a table, a desk, etc. are placed. It can also be used as a distribution reading antenna in a production line. Therefore, the reader antenna according to the present invention is not limited to a substantially rectangular substrate such as the shelf plates 7, 11, 12 of the bookshelf 1, but is substantially square, substantially parallelogram-shaped, substantially trapezoidal, substantially oval, It can be incorporated in a substrate having various other shapes.

  In the first to third embodiments described above, the substantially loop-shaped antenna pattern 31 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 third embodiments described above, the antenna pattern elements 53, 55, 57, 59, 62, 65 to 67 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 third embodiments described above, the number of bent portions 63 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 63 is not necessarily four, and may be any number greater or smaller than that, and may be one depending on circumstances.

In the first to third embodiments described above, a single central opening 42 is provided in the first porous sheet-like member 41. However, the number of central openings 42 provided in the first porous sheet-like member 41 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 42 shown in FIG. 2 or one or a plurality of strips extending substantially along the frontage direction x in the central opening 42. Two or more central openings 42 can be provided in the first porous sheet-like member 41, for example, by providing the first belt-like member 41 in the first porous sheet-like member 41.

  In the first to third embodiments described above, each of the pair of terminal portions 32a and 32b of the first loop antenna A and the pair of terminal portions 32a and 32b of the second loop antenna B is connected to the shelf. It was provided near the edge 58 on the right side of the plate 11. However, each of the pair of terminal portions 32a and 32b of the first and second loop antennas A and B has the rear edge portion 52 of the shelf board 11, the left edge portion 54, the front edge portion 56 and the facing portion. It can be provided near any edge of the right edge 58. For example, in the shelf plate 11 shown in FIG. 2, the pair of terminal portions 32 a and 32 b of the second loop antenna B are substantially symmetrical with the pair of terminal portions 32 a and 32 b of the first loop antenna A. You may provide in the vicinity of the edge part 54 of the left side facing the pair of terminal parts 32a and 32b of the second loop antenna B.

  Further, in the first to third embodiments described above, the opening ratio of the first porous sheet-like member 41 (that is, the opening ratio described in the item (1) in the item (1)) is determined. It was made uniform throughout. However, the aperture ratio of the first porous sheet-like member 41 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 41 (specifically, the second porous sheet-like member in the second or third embodiment described above) Similar to the second or third embodiment described above, the first porous sheet-like member 41 can be used as an interference preventing member by reducing the aperture ratio of the portion overlapping with 71). It is also possible to achieve the effect.

  In the second and third embodiments described above, the aperture ratio of the second porous sheet-like member 71 is made substantially the same as the aperture ratio of the first porous sheet-like member 41, and as a whole. It was made uniform. However, the aperture ratio of the second porous sheet-like member 71 does not necessarily have to be substantially the same as the aperture ratio of the first porous sheet-like member 41, and it does not necessarily have to be uniform as a whole. Absent.

  In the first to third embodiments described above, the first porous sheet-like member 41 is disposed on the lower surface of the antenna formation target member such as the shelf board 11. However, the first porous sheet-like member 41 can also be disposed on the upper surface of the antenna formation target member depending on the application and the like, and further, a pair of upper and lower is disposed on the upper surface and the lower surface of the antenna formation target member. You can also.

  In the second and third embodiments described above, the second porous sheet-like member 71 is disposed on the lower surface of the antenna formation target member such as the shelf board 11. However, the second porous sheet-like member 71 can be disposed on the upper surface of the antenna formation target member depending on the application and the like, and further, a pair of upper and lower surfaces are disposed on the upper surface and the lower surface of the antenna formation target member. You can also.

  In the second and third embodiments described above, the second porous sheet-like member 71 is bonded to the first porous sheet-like member 41 via the second intermediate film 72. . However, the second porous sheet-like member 71 can also be directly adhered to the first porous sheet-like member 41 with an appropriate adhesive.

  In the second and third embodiments described above, the second porous sheet-like member 71 is disposed on the outer surface of the first porous sheet-like member 41. However, the second porous sheet-like member 71 is provided on the inner side surface of the first porous sheet-like member 41 (specifically, the lower plate 34 and the first porous sheet-like member, if necessary). 41), or on the surface opposite to the first porous sheet-like member 41 (specifically, the outer surface of the upper plate 33). it can.

  Furthermore, in the second and third embodiments described above, the second porous sheet-like member 71 is disposed near one end in the length direction x of the antenna pattern 31 of the reader / writer antenna 15 (specifically, Is disposed only in the vicinity of the left end). However, the second porous sheet-like member 71 can be disposed only in the vicinity of the other end in the length direction x of the antenna pattern 31 of the reader / writer antenna 15, and in addition, in the vicinity of both ends. (Specifically, a pair can be provided for each of the left and right end portions and the right and left ends in the vicinity).

It is the perspective view in which the bookshelf in a 1st example which applied the present invention to the bookshelf search system was partially omitted. Example 1 It is a top view of the uppermost shelf board of FIG. Example 1 FIG. 3 is an enlarged longitudinal sectional view of a part of the shelf board of FIG. 2. Example 1 It is an expansion perspective view of the books of FIG. Example 1 FIG. 5 is an enlarged plan view of the electronic tag in FIG. 4. Example 1 It is a top view of the shelf board of FIG. 2 in the state without the shielding material in which the electroconductive porous sheet-like member is not attached. Example 1 FIG. 7 is an enlarged longitudinal sectional view of a part of the shelf board without a shielding material in FIG. 6. Example 1 It is an expansion perspective view of the terminal part vicinity of the shelf board without a shielding material of FIG. Example 1 It is a disassembled perspective view of the terminal part vicinity of the shelf board without a shielding material of FIG. Example 1 It is a top view of the uppermost shelf in the 2nd Example which applied this invention to the bookshelf search system. (Example 2) It is an enlarged vertical sectional view of a part of the shelf board of FIG. (Example 2) It is a top view of the uppermost shelf board in the 3rd Example which applied this invention to the bookshelf search system. (Example 3) FIG. 13 is an enlarged longitudinal sectional view of a part of the shelf board of FIG. 12. (Example 3) It is a graph which shows the maximum communicable distance in the up-down direction according to the position of the front-end | tip direction of the electronic tag of the reader / writer antenna of the 1st-3rd Example. (Examples 1 to 3 and Reference Example 1) It is a graph which shows the maximum communicable distance in the depth direction according to the position of the front-end | tip direction of the antenna for reader / writers of the 1st-3rd Example. (Examples 1 to 3 and Reference Example 1) 15 is a graph similar to FIG. 14 for the reader / writer antenna of Reference Example 2. (Reference Example 2) 15 is a graph similar to FIG. 14 for the reader / writer antenna of Reference Example 3. (Reference Example 3) 15 is a graph similar to FIG. 14 for the reader / writer antenna of Reference Example 4. (Reference Example 4)

Explanation of symbols

A First loop antenna B Second loop antenna x Frontage direction (second direction)
y Depth direction (first direction)
1 Bookcase (article placement shelf)
7 Bottom shelf (antenna formation target member)
11 Top shelf (antenna formation target member)
12 Second shelf board (antenna forming target member)
15 Antenna for reader / writer 31 Antenna pattern 33 having a substantially loop shape Upper plate (glass plate)
34 Lower plate (glass plate)
35 Intermediate film (insulating layer)
41 Conductive and porous sheet-like member 42 Central opening 53 First pattern portion 55 Second pattern portion 57 Third pattern portion 59 Fourth pattern portion 62 Base line portion 63 Bending portion 65 First rising portion 66 Second rising portion 71 Conductive and porous second sheet-like member

Claims (15)

In a reader antenna having an antenna pattern formed on an antenna formation target member,
A conductive and porous sheet-like member is provided on the antenna-forming target member so as to extend in a loop shape substantially along the outer periphery of the antenna pattern when seen in a plan view ,
The porous sheet-shaped member has a mesh structure in which conductive filaments are braided into a mesh shape,
A central opening is provided in the porous sheet-like member,
The ratio of the size of the central opening to the size of the porous sheet-like member including the central opening is in the range of 20 to 80%,
The outer periphery of the porous sheet-like member extends along the outer periphery or the outer periphery of the antenna pattern of the reader antenna when seen in a plan view,
The inner periphery of the porous sheet-like member is seen in a plane,
(A) The inner periphery on the first side in the first direction of the antenna forming target member in the inner periphery of the porous sheet-shaped member is in a second direction orthogonal to the first direction. The pattern portion extending substantially along the inner end of the pattern portion extending on the outermost periphery on the first side in the first direction in the pattern portion extending substantially along or extending along the inside thereof. thing,
(B) The inner periphery on the second side opposite to the first side in the first direction of the antenna forming target member of the inner periphery of the porous sheet-shaped member is the second side. Of the pattern portion extending substantially along the direction of the first portion, the inner end of the pattern portion extending on the outermost periphery of the second side in the first direction in the first direction or extending substantially along the inner side thereof. Being present,
(C) Of the inner periphery of the porous sheet-like member, the inner periphery on the first side of the antenna formation target member in the second direction extends substantially along the first direction. Extending substantially along the outer edge of the pattern portion extending on the outermost periphery of the first side in the second direction or the outside thereof in the second direction,
(D) The inner periphery on the second side opposite to the first side in the second direction of the antenna forming target member in the inner periphery of the porous sheet-shaped member is the first periphery. Out of the pattern portion extending substantially along the direction of the outer edge of the pattern portion extending along the outermost periphery of the second side in the second direction in the second direction, or extending substantially along the outside thereof Doing things,
Satisfy the conditions of
The first side in the first direction of the pattern portion in which the porous sheet-like member extends substantially along the second direction of the antenna forming target member when seen in a plan view. A reader antenna, characterized by substantially overlapping with a pattern portion extending in the vicinity of the end portion and the vicinity of the end portion on the second side . 2. The reader according to claim 1 , wherein the porous sheet-like member substantially overlaps with all the pattern portions extending substantially along the second direction when seen in a plan view. 3. Antenna. The porous sheet-shaped member, in plan view, according to claim 1 or 2, characterized in that substantially no overlap with any pattern portion extending substantially along said first direction The antenna for readers described in 1. Reader antenna according to claim 1, 2 or 3, wherein the pitch of the small apertures of the porous sheet-like member is in the range of 50～2,000Myuemu. Any of claims 1-4 in which per area of a large number of small apertures of the porous sheet-like member is characterized by a range of 4,000～1,800,000Myuemu ² 1 Antenna for readers as described in 1. 6. The porous sheet-like member according to any one of claims 1 to 5 , wherein an opening ratio of a large number of small holes formed therein is in a range of 70 to 95%. The antenna for readers described in 1. The conductive and porous second sheet-like member overlapping the vicinity of any one of the ends of the antenna pattern is at least one of the ends of the antenna formation target member. reader antenna according to any one of claims 1-6, characterized in that provided at a position corresponding to the vicinity of the part. The reader antenna is according to claim 1-7, characterized in that it comprises a first and second loop antenna are provided to the antenna formed object member in a state of being mutually superimposed and insulated from 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 member. The first pattern portion provided on the antenna, the second pattern portion provided on the first side in the second direction orthogonal to the first direction of the antenna formation target member, 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 member; and the first side in the second direction of the antenna forming target member. 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 8 , 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. Reader antenna according to any one of claims 1-9, characterized in that the reader antenna is configured as an antenna for a reader writer. The antenna formation target member is a shelf plate of an article placement shelf or a base plate of an article placement table,
The main component of the shelf board or the base plate is a transparent non-conductor,
Each of at least the antenna pattern of the first and second antenna, according to any one of claims 1 to 1 0, characterized in that it consists of the following wire conductor section diameter 0.5mm Reader antenna. The said 1st and 2nd antenna is provided between a pair of glass plates mutually laminated | stacked by interposing an insulating layer between these, The any one of Claims 1-11 characterized by the above-mentioned. The antenna for readers according to one. An article mounting shelf with an antenna, comprising a shelf board on which the reader antenna according to any one of claims 1 to 12 is formed as the antenna forming target member. Antenna article with mounting shelf of claim 1 3 in which the antenna with the article mounting shelf is characterized in that an antenna with the bookshelf. Antenna with article rack, characterized in that it comprises a base plate reader antenna according is formed as the antenna formation target member to any one of claims 1 to 1 2.

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