WO2005091434A1

WO2005091434A1 - Recording medium ic tag sticking sheet and recording medium

Info

Publication number: WO2005091434A1
Application number: PCT/JP2004/015419
Authority: WO
Inventors: Hiroki Morisaki; Takanori Suzuki; Tomohiro Ogata
Original assignee: Uchida Yoko Co.,Ltd.; Nittoku Engineering Kabushikikaisha
Priority date: 2004-03-24
Filing date: 2004-10-19
Publication date: 2005-09-29
Also published as: KR20060135822A; JP4374346B2; CN1926721A; JP4970503B2; JPWO2005091434A1; JP2009271932A

Abstract

There is provided an IC tag which can be stuck directly to a CD. The IC tag comprises a thin planar sheet (10) formed into a shape fitted to the CD, a loop-shaped antenna (101) provided along the circumference of the CD, and an IC chip (102) performing noncontact communication through the antenna. The antenna (101) is formed of a conductor and arranged on the recording region of the CD. Communication has been conventionally impossible when the antenna is arranged on the recording region of the CD, but communication is enabled when an antenna is formed of a conductor.

Description

Specification

IC tag attachment sheet for recording media and recording media

Technical field

The present invention relates to a sheet for attaching an IC tag to a disc-shaped recording medium such as a CD or a DVD, and a recording medium having an IC tag attached thereto, and is particularly suitable for a library lending management system. The purpose is to provide.

Background art

[0002] Recently, attention has been focused on IC tags. An IC tag is an ultra-small IC (integrated circuit) chip.

It is a small device that combines an antenna for wireless communication and can write and read data on an IC chip using a wireless communication device called a reader z writer.

[0003] If information unique to each ic chip (identification information) is recorded and attached to each product, literally "single item management" becomes possible, so its introduction has been widely studied mainly in the distribution field. Conventionally, barcodes have been widely used in the distribution field,

However, since IC tags can read and write data in a non-contact and remote manner and increase the amount of data that can be stored, they are more sophisticated than barcodes and can be applied to a wider range of applications. Te ru.

[0004] As a management system using an IC tag, a library lending management system is becoming widespread. Conventionally, barcode-type (optical code reading) and OCR (optical character recognition) -type lending management systems have been introduced in many libraries for the purpose of streamlining document management. A system using barcodes can greatly reduce the number of documents that can be saved, but the documents must be read one by one using a scanner, and the information of multiple documents must be read at once. I can't do it, and it's troublesome.

[0005] In order to solve the above problems and to further streamline the management of books and documents, in recent years, book information has been recorded on books and a registered ic tag has been attached. The information such as the registration number recorded in the information is read.

[0006] When a user borrows a book, the book is placed on the reader Z writer and attached to the book. Read the information of the IC tag and perform the lending process, and write the lending information to the IC tag. If you borrow more than one book, you must process all of the books. If you cannot read the information of any one of the multiple documents at the time of lending, you must manually check the power of reading the information of any one of the documents manually, which is a great deal of trouble. It takes. Therefore, the library lending management system must be able to reliably communicate with the IC tags of all books.

[0007] By the way, the number of libraries that lend music CDs and movie DVDs together with books is increasing. The ability to attach IC tags to manage CDs and DVDs (hereinafter collectively referred to as `` recording media ''). In the past, IC tags were mostly affixed to the case of recording media. Attachment of IC tags directly to media was not performed. The antenna of the reader Z writer and the antenna of the IC tag are electromagnetically coupled to supply power to the IC tag and perform communication.However, if the IC tag is directly attached to the recording medium, the recording surface of the recording medium (conductor This is because, due to the effect of aluminum thin film, electromagnetic coupling is not performed well and communication becomes impossible.

[0008] When an IC tag is attached to a case, correct management cannot be performed when the contents of the case are empty or the contents of the case are misplaced. In order to perform appropriate management in consideration of such circumstances, it is necessary to check each case of the recording medium and its contents, which takes a great deal of time. In this case, there is no point in introducing IC tags. Therefore, it is required that IC tags be directly attached to recording media.

Patent Document 1: JP-A-11 250494

[0010] Patent Document 1 discloses integrating a non-contact IC chip with a disk-shaped recording medium. Embed or paste an electromagnetically coupled non-contact IC chip near the center hole of the CD-ROM, which is the recording medium, and embed or paste the antenna into the CD-ROM so as to go around the center hole. On the chip, information for identifying each medium and information for confirming the authenticity of the recorded content of the CD-ROM are recorded.

Disclosure of the invention

Problems to be solved by the invention

[0011] An IC tag attached to a recording medium transmits and receives power supply power and signals by an electromagnetic coupling method. Conforms to the library lending management system, in addition to the following conditions: read-only or writable and readable, and does not protrude from the surface of the recording medium and does not hinder rotation. Therefore, it is necessary to satisfy the following conditions.

[0012] (1) In the library lending management system, the distance from the reader Z writer may be about several tens of cm, so communication must be possible even in such a case. Also, since the general gate interval for detecting carry-out is 90 cm, a reading distance of about 45 cm, which is half of that, is preferable. (The communication distance of the IC tag becomes extremely short due to the influence of the recording surface of the recording medium, and at least It has been said that it is impossible to use a library lending management system by attaching an IC tag directly to a recording medium.)

[0013] (2) Since there are cases where several books and several CDs are lent at the same time, all books and CDs are placed on the reader Z writer after stacking many books and CDs. It must be able to communicate with the IC tag on the CD.

[0014] (3) It must be applicable to all recording media handled by libraries. At a library, an IC tag is attached to a recording medium (it is attached later rather than during the manufacturing process of the recording medium), so the IC tag must be usable on any recording medium. The inventor has found that the communication performance of an IC tag varies greatly depending on the type of recording medium. The standard specifies the size and material of the recording medium, but in reality it seems to be affected by the printing conditions (print thickness, ink type, etc.) on the recording medium surface (particularly iron content). Influence of the inks included seems to be large).

[0015] An antenna is provided so as to circumnavigate a central hole of a CD-ROM disclosed in Patent Document 1 (there is no influence of the recording surface of the aluminum thin film in this portion because there is no recording surface of the aluminum thin film in this portion). Because the diameter of the antenna provided around the central hole is small and the communication capability is low, the IC tag cannot communicate at a short distance (at most about 5 cm). Therefore, conditions (1) and (2) above cannot be satisfied. It should be noted that paragraph 0018 of Patent Document 1 states that the antenna is disposed at the outermost periphery of the recording medium. In this paragraph, a finger or a member of a CD-ROM drive often contacts the outer periphery. Therefore, there are many opportunities to damage the IC chip, which is not preferable in practical use. This is because, in Patent Document 1, an antenna is provided in a portion other than the recording surface of the aluminum thin film, that is, in a portion other than the information recording area. Therefore, the antenna has to be provided on the edge of the disk of the recording medium, which has a width of only about 1 mm. Patent Document 1 has a basic concept of providing an antenna in a portion where the recording surface does not exist in order to avoid the influence of the recording surface of the aluminum thin film! /, It is asked.

[0016] In the invention disclosed in Patent Document 1, the condition (3) cannot be satisfied. Referring to the entire description of Patent Document 1, it seems that the present invention is for providing an IC tag in a manufacturing process of a recording medium, and does not seem to affix the IC tag after shipping with a product. . Patent Literature 1 does not apply to various types of recording media, but ignores the influence of the printing surface of important recording media when attaching an IC tag afterward. Cannot be used.

An object of the present invention is to provide an IC tag affixing sheet for a recording medium and a recording medium that satisfy the above conditions (1) and (3) and are particularly suitable for a library lending management system. Means for solving the problem

The present invention provides a disk-shaped recording medium including a recording area for recording information therein.

A sheet for attaching a C tag, in which a thin base formed in a shape compatible with the recording medium, a loop antenna provided on the base, and non-contact communication are performed through the antenna. With an IC chip,

The antenna is formed of a conductor having a substantially circular cross section, a substantially regular polygon or a substantially square.

In a state where the antenna is attached to the recording medium, the antenna is located on a recording area of the recording medium.

[0019] It is preferable that the number of turns and the interval between the conductors of the antenna are set so as to reduce the variation in the communication distance of the antenna when the antenna is attached to a plurality of types of recording media.

[0020] Preferable examples of the number of turns and intervals of the conductor of the antenna are as follows.

• When used for a CD'DVD with a frequency of 13.56 MHz and a diameter of 12 cm as a recording medium, the number of turns of the conductor is 4, and the interval between the conductors is 0.35 mm or 0.45 mm. However, the diameter of the antenna is 110 mm, and the cross-sectional diameter φ of the conductor is 0.11 mm.

[0021] The resonance frequency of the antenna before being attached to the recording medium, It is preferable to set the frequency higher than the operating frequency of the IC chip.

[0022] The antenna includes a plurality of arc-shaped circumferential portions located on the circumference of the recording medium, and a plurality of non-circumferential portions located on the inner side of the circumference of the recording medium. The circumferential portions may be arranged symmetrically with respect to the rotation center of the recording medium, and the non-circumferential portions may be arranged symmetrically.

It is preferable that the shape of the antenna be variously different so that when a plurality of recording media to which the IC tag is attached are stacked, the antennas of the recording media do not interfere with each other. If the antenna has a non-circumferential portion, the shape of the non-circular portion can be set arbitrarily, and various shapes can be realized.

[0024] Further, a balance weight provided at a position symmetrical to the position of the IC chip with respect to the rotation center of the recording medium may be provided.

[0025] The storage medium according to the present invention includes a disk-shaped recording medium including a recording area for recording information therein, a loop-shaped antenna provided on the surface of the recording medium, and a non-contact through the antenna. With an IC chip that communicates with

The antenna is formed of a conductive wire having a substantially circular or substantially square cross section, and the antenna is located on a recording area of the recording medium.

The invention's effect

According to the present invention, since the antenna is formed by a conductor having a substantially circular or substantially square cross section and the antenna is arranged along the circumference of the recording medium, the communication distance can be extended to a practically usable extent. . By appropriately selecting the number of turns and the spacing of the conductors constituting the antenna, the sticker can be attached to various recording media and used. BEST MODE FOR CARRYING OUT THE INVENTION

[0027] An IC tag sticking sheet for a recording medium according to an embodiment of the present invention and a recording medium to which the sheet is attached will be described with reference to the drawings.

FIG. 1 is a diagram showing an IC tag sticking sheet for a recording medium according to an embodiment of the present invention. FIG. 1 (a) is a plan view, and FIG. 1 (b) is a cross-sectional view taken along line AA of the plan view. FIG. The cross-sectional view is a schematic diagram, and the thicknesses are correct and the scale is shown. Also, it shows a planar / linear state on the assumption that no distortion / bending occurs! In FIG. 1, 1 is an implementation of the present invention. 5 is an IC tag sticking sheet for a recording medium according to the embodiment. The IC tag affixing sheet 1 for a recording medium has a disk-shaped sheet (base) 10 which is the same shape as a recording medium such as a CD and is slightly smaller, and a little inside the outer edge of the sheet 10 (eg, about 2.5 mm inside). An antenna 101 provided along the circumference, an IC chip 102 that communicates with the outside in a non-contact manner through the antenna 101, a connection lead 103 for connecting the antenna 101 to the IC chip 102, and rotation of a recording medium. A counter weight (balance weight) 104 is provided at a symmetrical position of the IC chip 102 with respect to the center to balance rotation. On the lower surface of the IC tag attachment sheet 1 for recording media, a double-sided tape 11 (eg, thickness = about 0.05 mm) for attaching the sheet 1 to the recording medium, and a separator that protects the adhesive surface of the double-sided tape 11 There are twelve. The separator 12 is peeled off, and the IC tag attachment sheet 1 for a recording medium is attached to the recording medium.

[0028] The sheet 10 is a base on which the antenna 101 and the IC chip 102 are mounted, and its shape is adapted to a recording medium. Specifically, it has a circular shape. If the diameter of the sheet 10 is equal to or larger than the recording medium, the sheet 10 may hinder the rotation of the recording medium. Therefore, the diameter of the sheet 10 is slightly smaller than the recording medium (eg, the diameter of the recording medium). = About 120111111, diameter of sheet 10 = about 115mm). Inside the sheet 10, an inner hole having a diameter larger than that of the inner hole is provided so as not to block the inner hole for rotationally driving the recording medium. In FIG. 1, 10a indicates the outer edge of the sheet 10, and 10b indicates the edge of the inner hole of the sheet 10.

[0029] The sheet 10 is provided with an opening for accommodating the IC chip 102 and the counterweight 104. Therefore, the surface of the sheet 10 is flat. If the IC chip 102 is relatively thin, the IC chip 102 does not protrude above the sheet 10, but may slightly protrude (for example, the thickness of the resin (polycarbonate) sheet 10 = about 0). 25mm ₀ IC chip with height of main body = 0.15mm and thickness of mounting part = 0.08mm does not protrude on sheet 10, but main body height = 0.3mm, thickness of mounting part = 0. It protrudes slightly for an 08mm IC chip).

[0030] The antenna 101 (eg, the diameter of the antenna = about 110mm) is formed by winding a conductor having a substantially circular cross section (may be a substantially square or a regular polygon) a plurality of turns. . Communication is not possible if the cross section is thin or foil like a printed circuit, but a conductor with a circular cross section It has been found that communication is possible as described later by using. It is presumed that a regular polygon or a square can be used in addition to a circle. The resonance frequency of the antenna 101 is set higher than the operating frequency of the IC chip 102. With this setting, when the recording medium IC tag attachment sheet 1 is attached to the recording medium, the resonance frequency is lowered, and becomes equal to the working frequency. As shown in FIG. 1A, by arranging the antenna 101 in a circular shape along the outer edge of the sheet 10, the diameter of the antenna 101 can be maximized and the gain thereof can be increased. However, if at least a part of the antenna 101 has the shape shown in FIG.

FIG. 2A shows a detailed cross-sectional view of a portion of the antenna 101. The antenna 101 is composed of four conductors 101-1 to 101-4 arranged substantially concentrically. The diameter of the conductor is about 0.11. The four conductors 101—1—101—4 are arranged at a constant interval (pitch) P. The power to configure the antenna 101 with thin conductors is important to satisfy the above conditions (1)-(3). When the thickness is smaller than the conductor width (typically when the conductor is printed or etched) as shown by reference numerals 101'-1 and 101'-2 in Fig. 2 (c), it is attached to the recording medium. It was impossible to communicate with the IC tag in this state. The reason is that when formed by etching or the like, it is difficult to increase the thickness of the conductor, and the cross-sectional area cannot be increased. Even if it is made thicker, one side (for example, the side) of the conductor becomes thinner and the cross-sectional area cannot be increased like a conductor. Therefore, it is presumed that the resistance value becomes larger than the inductance, and the characteristics of the coil deteriorate.

On the other hand, if the antenna is constituted by a conductor as shown in FIG. 2A, the antenna 101 and the IC chip 102 can be provided in a region where the recording surface of the recording medium is present. Patent Document 1 discloses the power of providing antenna 101 and IC chip 102 only in a region where a recording surface does not exist. According to the embodiment of the present invention, such a restriction becomes unnecessary.

FIG. 2B shows a detailed cross-sectional view of a part of the IC chip 102. Force depending on the type of IC chip 102 The IC chip 102 includes a main body 102a and a mounting portion 102b as a base thereof. Attach the IC chip 102 to the sheet 10 with the attaching portion 102b. The main body 102a is housed in an opening provided in the seat 10. FIG. 2D shows an example of a plan view of the IC chip 102. In this example, both ends of the main body 102a are provided with mounting portions 102b also serving as connection terminals. Antennas on these terminals The terminal 101 is connected. The part of the counter weight 104 is the same as that of FIG.

FIG. 3 is a diagram showing a state in which the IC tag attachment sheet 1 for a recording medium is attached to a recording medium. FIG. 3 (a) is a plan view, and FIG. It is arrow sectional drawing. As is clear from FIG. 3 (a), the recording medium IC tag attaching sheet 1 does not protrude the recording medium force. Therefore, if the thickness of the sheet 1 is within the range permitted by the standard of the recording medium, the original function of the recording medium will not be impaired. The antenna 101 and the IC chip are provided on a recording surface (recording area) 21 of a recording medium as shown in FIG.

Next, a specific example of the embodiment of the present invention will be described.

FIGS. 4 and 8 show actual measurement data obtained by measuring the resonance frequency and the communication distance by changing the number of windings of the antenna 101 and the interval (pitch) thereof. The resonance frequency is measured using a dip meter. An oscillation circuit is inserted in the dip meter, and the oscillation energy is displayed on the meter! Bring the coil of the dip meter closer to the coil of the resonance circuit to be measured, turn the dial of the measuring instrument to change the oscillation frequency little by little, and when the resonance frequency is reached, the oscillation energy of the dip meter will reach the resonance circuit to be measured. It is sucked and the needle of the meter goes down. This is used to measure the frequency of the resonant circuit.

FIG. 4 shows the characteristics when the number of turns = 4 and the pitch = 0.35 mm. Fig. 4 (a) is a graph showing the resonance frequency and the communication distance. The vertical scale on the right side of the graph indicates the frequency (unit: MHz), and the vertical scale on the left side indicates the communication distance (unit: mm) (the same applies to the graphs in FIG. 5 and subsequent figures). The horizontal axis is the number of the recording medium to which the IC tag to be measured is attached. In Fig. 4, measurements are made on 10 recording media. All ten recording media in Fig. 4 are of the same type. On the other hand, the data after Fig. 5 are measured for different types of recording media. FIG. 4 (b) shows the measured data. The graph in Fig. 4 (a) is a graph of the data in Fig. 4 (b) (the same applies hereinafter).

According to FIG. 4, the following is clear.

• Since all recording media are of the same type, there is little variation in resonance frequency and communication distance for each recording medium.

'The resonance frequency is about 14.5MHz and the communication distance is about 260mm.

[0037] Fig. 5 shows the characteristics of the number of turns = 4, the pitch = 0.35mm, and different types of recording media. You. According to Fig. 5, the following is clear.

• Due to the different types of recording media, the variation in resonance frequency and communication distance for each recording medium has increased.

'The resonance frequency is about 14. OMHz and the communication distance is 231-270mm.

[0038] Fig. 6 shows the characteristics of the number of turns = 5, the pitch = 0.35mm, and different types of recording media. According to Fig. 6, the following is clear.

• Due to the different types of recording media, the variation in resonance frequency and communication distance for each recording medium has increased. In particular, the communication distance varies greatly.

'The resonance frequency is 15.00-15.70MHz and the communication distance is 222-310mm.

FIG. 7 shows the characteristics of the number of turns = 5, the pitch = 1.35 mm, and different types of recording media. According to Fig. 7, the following is clear.

'The resonance frequency is 14.10-14.40MHz and the communication distance is 213-309mm.

FIG. 8 shows the characteristics of the number of turns = 4, the pitch = 0.45 mm, and different types of recording media. According to Fig. 8, the following is clear.

'The resonance frequency is 14.0-14.50MHz and the communication distance is 241-280mm.

Comparing FIG. 5 and FIG. 8, it can be seen that FIG. 8 shows a smaller variation in communication distance and a longer communication distance. From FIGS. 6 and 7, it can be seen that when the number of turns is increased from 4 or the pitch is increased to 1.35 mm, the variation in the communication distance becomes extremely large. In order to satisfy the condition (3) described above, it is desirable not to increase the number of turns or increase the pitch too much.

[0042] From the viewpoint of use in the library lending management system, a plurality of types of windings and intervals of the conductor of the antenna 101 satisfy the above-mentioned conditions (1) and (3), that is, while maintaining a predetermined communication distance. It is preferable that the communication distance of the antenna is set so as to be less varied in a state where the antenna is attached to the recording medium. Summarizing the above data, it can be said that the example in Fig. 8 is most suitable for the conditions (1) and (3) described above. It has been found that when the antenna 101 is attached to a recording medium, its resonance frequency becomes lower. This is presumed to be due to capacitive coupling between the antenna and the recording surface of the recording medium. Therefore, it is preferable that the resonance frequency of the antenna 101 before being attached to the recording medium be set higher than the operating frequency of the IC chip 102 (eg, 13.56 MHz). In this way, optimal performance can be exhibited in the usage state of the IC tag. Figure 9 shows the characteristics of the antenna before attaching it to the recording medium (CD). Fig. 9 shows an antenna with the same conditions as Fig. 8. The resonance frequency of the antenna before attachment is 19.2 MHz with a dip meter. When the antenna is attached to a recording medium, it decreases by about 25% from 14.00 to 14.50 MHz as shown in Fig. 8.

[0044] Embodiments of the present invention are characterized in that the antenna is configured using a conducting wire that is not printed or etched. This is based on the inventor's knowledge that almost no communication is possible in the state of being attached to a recording medium by printing or etching, but communication is possible with a conductor. Antennas using conductors can increase costs compared to printing and etching.In the case of a library lending management system, IC tags are attached to recording media after the fact, so it is not a problem to use them in large quantities. No.

[0045] As described above, according to the embodiment of the present invention, the antenna is formed of a conductor having a substantially circular cross section, and the antenna is arranged along the circumference of the recording medium. Since the outer diameter can be increased and the output can be increased, the communication distance has been successfully extended to a practical level. By appropriately selecting the number of turns and the spacing of the conductors constituting the antenna, it has become possible to use the antenna by attaching it to various recording media. As a result, as the output increases, the antenna can be arranged on the recording area of the recording medium in a state of being attached to the recording medium, so that the reliability can be improved. In the conventional method, the antenna cannot be placed on the recording area, but the antenna has to be provided on the outer periphery, and the fingers and the members of the driving device come into contact, damaging the antenna and the IC chip, making it almost impractical .

By the way, the condition (2) described above must be able to communicate with the IC tags of all the books and recording media even when a number of books and recording media are stacked and placed on the reader Z writer. However, it can be satisfied by configuring the antenna as described above. In order to be able to communicate with IC tags more reliably, it is preferable to avoid interference between IC tags. Good. One way to do this is to increase the size of the antenna as described above and prepare antennas of various shapes so that adjacent recording media do not overlap when recording media are stacked. Conceivable. If only one type of antenna in Fig. 1 is used, the entire antenna will be very close to each other when the recording media are superimposed, and the reader Z writer will be able to communicate near and far, while the nearer will be closer and closer. Communication may be difficult due to interference of other antennas.

[0047] Even when the shape of the antenna is various, it is preferable to arrange at least a part of the antenna along the circumference of the recording medium in order to increase the area of the antenna as much as possible. As the shape of the antenna, the circular shape shown in FIG. 1 and the non-circular shape can be adopted. The term non-circular as used herein means that at least a part of the non-circular shape is arranged along the circumference of the recording medium and forms an arc, but a part of the non-circular shape is separated from the circumference and arranged inside. The one shown in Fig. 11 (a) is also a kind of non-circular here. In order to maintain the balance of rotation, the arcs arranged along the circumference with respect to the center of rotation of the recording medium are symmetrical, and the arcs arranged inside the circumference are also symmetrical. Desired,.

[0048] The antenna 101 of Fig. 10 has two arcs (circumferential portion) 101a of about 1Z4 of the circumference and two portions (non-circumferential portion) of a shape obtained by bending the portion of about 1Z4 of the circumference inward. 101b. The circumferential portions 101a are arranged symmetrically with respect to the rotation center of the recording medium. The same applies to the non-circumferential portion 101b. The antenna 101 in FIG. 10 has a shape like a so-called weight.

The antenna 101 shown in FIG. 11A is composed of two circular arcs (circumferential portions) 101a having a circumference of about 1Z6 and a straight line portion (non-circumferential portion) 101b connecting the ends thereof. The circumferential portion 101a and the non-circular portion 101b are arranged symmetrically as in FIG. The antenna in Fig. 10 has a shape close to a rectangle. Note that, in the case of FIG. 11, the sheet 10 does not have to have a disk shape. For example, the sheet 10 may have a shape similar to the antenna 101 as shown by a dotted line in FIG. The sheet 10 has a shape suitable for the recording medium, and the shape includes a shape similar to the antenna of FIG.

[0050] In the above description, an example is described in which at least a part of the antenna is arranged along the circumference of the recording medium and forms an arc. Even if it is not provided, the same action and effect can be obtained. Placing at least part of the antenna along the circumference of the recording medium makes the most effective use of the area of the recording medium, but if the area of the antenna can be increased, it is essential to arrange it along the circumference. is not. Figure

1 Kb) shows an example of such an antenna. The figure shows the case where the antenna is square

[0051] By making the shape of the antenna various as shown in Fig. 1, Fig. 10, and Fig. 11, even when a plurality of recording media to which IC tags are attached are superimposed, the antennas of the recording media are mutually reciprocal. It is possible to prevent interference. From the viewpoint of preventing interference, it is preferable that the shape of the antenna be different for each recording medium. In the case of the circular antenna shown in FIG. 1, there is a possibility that the antenna will interfere even if the recording medium is rotated.However, if the recording medium is rotated as shown in FIGS. Can also prevent antenna interference. In other words, even when only one type of non-circular antenna is used, the recording medium is oriented in various directions during use, so that the antennas hardly completely overlap, and the possibility of interference is reduced.

[0052] The above description has been made taking the use of the library lending management system as an example.

However, the present invention is not limited to this use. For example, the present invention can be applied to any application that needs to satisfy some or all of the above conditions (1)-(3).

[0053] The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the invention described in the claims, which are also included in the scope of the present invention. Needless to say, it is a thing.

Brief Description of Drawings

FIG. 1 is a diagram showing an IC tag sticking sheet for a recording medium according to an embodiment of the present invention. Figure 1

1A is a plan view, and FIG. 1B is a sectional view taken along line AA of the plan view.

[FIG. 2] FIG. 2 (a) is a detailed sectional view of an antenna part according to an embodiment of the present invention, FIG. 2 (b) is a detailed sectional view of the IC chip part, and FIG. Alternatively, FIG. 2 (d) is an example of a plan view of an IC chip in a detailed cross-sectional view when formed by etching.

FIG. 3 is a diagram showing a state in which an IC tag attachment sheet for a recording medium according to an embodiment of the present invention is attached to a recording medium. 1 (a) is a plan view, and FIG. 1 (b) is a cross-sectional view taken along line A—A in the plan view. FIG.

圆 4] Actual measurement data of the resonance frequency and the communication distance of the antenna according to the embodiment of the present invention (same CD, number of windings = 4, interval = 0.35 mm) o

圆 5] Actual measurement data of resonance frequency and communication distance of the antenna according to the embodiment of the present invention (heterogeneous CD, number of windings = 4, interval = 0.35 mm) o

圆 6] Actual measurement data of the resonance frequency and the communication distance of the antenna according to the embodiment of the present invention (heterogeneous CD, number of windings = 5, interval = 0.35 mm) o

圆 7] Actual measurement data of the resonance frequency and communication distance of the antenna according to the embodiment of the present invention (heterogeneous CD, number of windings = 5, interval = 1.35 mm) o

圆 8] Actual measurement data of the resonance frequency and the communication distance of the antenna according to the embodiment of the present invention (heterogeneous CD, number of windings = 4, interval = 0.45 mm).

[9] This shows characteristics of the antenna according to the embodiment of the present invention before being attached to the recording medium. [10] FIG. 10 is a plan view showing a non-circular antenna shape according to the embodiment of the present invention. {11} is a plan view showing another non-circular antenna shape according to the embodiment of the present invention.

1 IC tag attachment sheet for recording media

2 Recording media

2a Outer edge of recording medium

2b Edge of inner hole of recording medium

10 seats (base)

10a Outer edge of sheet

10b Edge of inner hole of sheet

11 Double-sided tape

12 Separator

21 Recording surface of recording medium (aluminum thin film)

101 Asotena

101a Antenna circumference 101b Non-circumferential part of antenna 102 IC chip

102a IC chip body

102b IC chip mounting part 103 Connecting wire

104 counter weight

Claims

The scope of the claims

[1] A sheet for attaching an IC tag to a disk-shaped recording medium including a recording area for recording information therein, the sheet-shaped base being formed in a shape suitable for the recording medium; A loop-shaped antenna provided on the base, and an IC chip for performing non-contact communication through the antenna, wherein the antenna is formed of a conductor having a substantially circular cross section, a substantially regular polygonal shape or a substantially square shape, and An IC tag affixing sheet for a recording medium, wherein the antenna is positioned on a recording area of the recording medium in a state of being affixed to the recording medium.

[2] The number of turns and the spacing of the conductors of the antenna are set so as to reduce the variation in the communication distance of the antenna when attached to a plurality of types of recording media! The sheet for attaching an IC tag for a recording medium according to claim 1.

[3] The resonance frequency of the antenna before being attached to the recording medium,

2. The IC tag affixing sheet for a recording medium according to claim 1, wherein the frequency is set higher than the operating frequency of the IC chip.

[4] The antenna includes: a plurality of arc-shaped circumferential portions located on the circumference of the recording medium; and a plurality of non-circumferential portions located on the inner side of the circumference of the recording medium. 2. The recording medium IC according to claim 1, wherein the circumferential portions are arranged symmetrically with respect to the rotation center of the recording medium, and the non-circumferential portions are arranged symmetrically. Tag sticking sheet.

5. The recording medium IC tag attachment sheet according to claim 1, further comprising a counterweight provided at a position symmetrical to a position of the IC chip with respect to a rotation center of the recording medium.

[6] A disc-shaped recording medium including a recording area for recording information therein, a loop-shaped antenna provided on the surface of the recording medium, and an IC chip that performs non-contact communication through the antenna Prepare,

A recording medium, wherein the antenna is formed of a conductive wire having a substantially circular or substantially square cross section, and the antenna is located on a recording area of the recording medium.