JP2008041156A - Optical disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk on which an IC tag module is mounted at low cost, without having to lower the reproduction quality. <P>SOLUTION: The optical disk 10, incorporating the IC tag module IC, is constituted of an optical reading part 14 that has a recording layer 12 and an IC tag module sealing part 16, where the IC tag module IC is sealed with a molding material 16b that has density of 1.2 g/cm<SP>3</SP>or higher. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical disk formed by sealing a resin-molded IC tag module integrated with an antenna.

  Conventionally, inexpensive bar code labels exist as non-contact IDs that do not require a power source in order to improve the efficiency of logistics / management and product traceability. However, it is not practical when considering use in the life cycle from manufacturing to disposal because it is vulnerable to scratches and dirt, and is often printed and pasted on the package rather than the main body. Moreover, even if the label is protected with a resin film or the like, it has not been a fundamental solution for scratches and dirt, and problems such as poor adhesion and peeling related to the label being adhered to the product and securing of an adhesive space have also occurred.

  Therefore, in recent years, IC tags made into ICs have been used. It has the advantage that it can be read or read in a non-contact manner and has a larger amount of information than conventional barcodes. Since these IC tags are distinct from conventional identification methods, the number of used and used in the future The range is expected to expand rapidly.

  In addition, the cost of the IC tag itself is not only reduced in price due to mass production, but also IC tag module technology has been developed such as integrating an antenna for communication with the IC (Patent Documents 1 and 2). For this reason, it is said that in the future it will cost less than 5 yen, and there is a high possibility that it will be mounted as an electronic tag for any product in the future.

  Recently, use for content protection, billing, etc. has been considered from the viewpoint that an individual ID that cannot be duplicated can be given, and mounting by embedding an IC tag module in an optical disc has been proposed.

  However, when an IC tag module is mounted on an optical disc, the density (specific gravity) of the disc molding resin and the IC tag module is different, resulting in an imbalance in weight and adversely affecting the rotary servo. Therefore, a technique for dealing with the problem has been proposed. For example, Patent Document 1 discloses a technique for reducing an unbalance amount by mounting a dummy chip as a balancer.

JP 2005-209323 A

  However, although the technique of Patent Document 1 is to balance, it is not preferable because an extra chip is mounted on the optical disk.

  The present invention has been made in view of the above problems in the prior art, and an object thereof is to provide an optical disc on which an IC tag module is mounted at a low cost without deteriorating reproduction quality.

The present invention provided in order to solve the above-described problems is that, in an optical disc incorporating an IC tag module, the IC tag module is sealed with an optical reading unit having a recording layer and a molding material having a density of 1.2 g / cm ³ or more. An optical disc comprising an IC tag module sealing portion that is stopped.

  Here, the molding material is preferably a thermoplastic resin alone or a material containing the thermoplastic resin. Moreover, it is preferable that the thermoplastic resin contains an aliphatic polyester.

Moreover, it is preferable that the said molding material contains the nonmetallic filler with a density of 1.5 g / cm < ³ > or more.

  The IC tag module may be arranged in an inner peripheral area of the optical disc from the recording layer.

  Moreover, it is preferable that the said optical reading part is an upper layer, and the said IC tag module sealing part is a lower layer. At this time, the IC tag module sealing portion is composed of an inner peripheral portion whose thickness is equal to or greater than the thickness of the IC tag module and equal to or smaller than the thickness of the optical disc, and an outer peripheral portion thinner than the inner peripheral portion, It is preferable that the IC tag module is sealed on the inner periphery.

  According to the present invention, it is possible to mount an IC tag module having a high product unique ID that can be used for copyright and billing on an optical disc at low cost. In addition, since the non-metallic filler can be used by separating the IC tag module sealing portion and the optical reading portion, an ID built-in optical disc capable of producing a high-density molding material and having a small amount of eccentric gravity and high-speed reading can be manufactured. In addition, since the weight imbalance due to the IC tag module can be reduced by the molding material density, the tag size can be increased correspondingly to increase the communication distance of the IC tag module.

  The inventors have placed the IC tag module on the inner periphery of the optical disc that has no signal area and does not require optical reading, and the density of the molding material of the optical disc that seals the IC tag module is increased to reduce the amount of eccentric gravity. Based on this idea, intensive studies have been made and the present invention has been achieved.

The optical disc according to the present invention will be described below.
An optical disc according to the present invention is an optical disc containing an IC tag module, wherein the IC tag module is sealed with an optical reading unit having a recording layer and a molding material having a density of 1.2 g / cm ³ or more. An IC tag module sealing portion is used.

FIG. 1 shows a configuration of the optical disk according to the first embodiment of the present invention. FIG. 1A is a front view of the optical disc as viewed from the optical reading side, and FIG. 1B is a cross-sectional view of the optical disc.
The optical disk 10 has a donut disk shape having an inner peripheral portion 18 that is a central hole of a circular gap (FIG. 1A), and an optical reading unit 14 that is an upper layer in the drawing and an IC tag module that is a lower layer. The sealing part 16 is laminated | stacked (FIG.1 (b)).

  In recent years, content protection of media media has been strongly demanded from the viewpoint of copyright protection, and various proposals for incorporating an IC tag module in an optical disc have been made. At this time, mounting an IC tag module increases the weight imbalance of the optical disk, and the influence on the servo during high-speed rotation cannot be ignored.

FIG. 2 plots the unbalanced weight ((IC tag module weight) − (resin weight of the same size)) between the molding material and the IC tag module when the density of the molding material (resin) constituting the optical disk is defined. Results are shown. Here, the tag size is changed by 1 to 3 times. To increase the communication distance of the IC tag module, it is most effective to increase the antenna area. However, if the antenna area is increased, the amount of unbalance increases accordingly. In FIG. 2, considering COP (cycloolefin polymer, density 1.01 g / cm ³ ), which is a low-density resin, the tag size is doubled when a resin having a density of about 1.6 g / cm ³ is used. be able to. However, there is no high-density optical disk resin that also has optical characteristics.

  Therefore, in the present invention, as shown in FIG. 1, the optical disk 10 is divided into an optical reading unit 14 and an IC tag module sealing unit 16 that does not require optical characteristics, thereby reducing imbalance by incorporating an IC tag module. The problem was solved. In other words, since it is not necessary to consider the optical characteristics in the IC tag module sealing portion 16, not only can a high-density resin be selected as a molding material, but also a filler can be added to the resin. In this way, an optical disc with a small eccentric gravity center is manufactured by combining an IC tag module sealing portion 16 formed by sealing an IC tag module with a molding material whose density is adjusted in this way and an optical reading portion 14 that ensures optical characteristics. Is possible. Optical disks include CDs (Compact Discs), DVDs (Digital Versatile Discs), and BDs (Blu-ray Discs). Of these, BD-ROMs have a thickness of 1. The thickness direction of a 2 mm optical disk can be separated into a thin optical reading unit 14 (upper layer) and an IC tag module sealing unit 16 (lower layer) containing a thick IC tag module IC. Further, even if a DVD is considered, the inner periphery such as a clamp area can be separated without the need for optical characteristics.

  The optical reading unit 14 protects the base layer 11 with pits formed thereon, the recording layer 12 made of a reflective film provided on the pits, and the recording layer 12 and optically reads information from the recording layer 12. And a protective layer 13 that secures the optical path. The base layer 11 is made of resin and is formed together with pit formation by injection molding. The base layer 11 may be omitted by forming the pits on the main surface of the IC tag module sealing portion 16 on the optical reading side.

The IC tag module sealing portion 16 is a donut disk-shaped flat plate for ensuring the mechanical strength of the optical disk 10. The IC tag module IC is sealed with a molding material 16 b having a density of 1.2 g / cm ³ or more. Stopped. The density of the molding material 16b is preferably 1.33 to 2.1 g / cm ³ . The lower limit of density is to improve the unbalance problem as described above, and the upper limit of density is due to load limitation on the drive device as an optical disk.

  The molding material 16b is preferably a thermoplastic resin alone or a material containing the thermoplastic resin. Moreover, it is preferable that a thermoplastic resin is what contains aliphatic polyester.

  The aliphatic polyester is a biodegradable organic polymer compound (biodegradable polymer compound). This biodegradable polymer compound is a low-molecular compound that eventually participates in microorganisms in nature after use, and a compound that eventually decomposes into water and carbon dioxide (Biodegradable Plastics Study Group, ISO / TC-207 / SC3) It is.

  As the aliphatic polyester, polylactic acid such as poly-L-lactic acid (PLLA), a random copolymer of L-lactic acid and D-lactic acid, or a derivative thereof is more preferable. General polylactic acid is a crystalline polymer excellent in biodegradability having a melting point of about 160 to 170 ° C. and a glass transition temperature of about 58 ° C. Besides these, for example, polycaprolactone, polyhydroxybutyric acid, polyhydroxyvaleric acid, polyethylene succinate, polybutylene succinate, polybutylene adipate, polymalic acid, polyglycolic acid, polysuccinic acid ester, polyoxalic acid ester, polydiglycolic acid Butylene, polydioxanone, microbial synthetic polyester, and the like can also be applied. Examples of the microbial synthetic polyester include 3-hydroxybutyrate (3HB), 3-hydroxyvalerate (3HV), and copolymers thereof.

  The molecular weight (number average molecular weight) of the aliphatic polyester is preferably about 30,000 to 200,000. When the molecular weight is less than 30000, the strength of the finally obtained composite composition becomes insufficient. On the other hand, when it exceeds 200000, the moldability and workability deteriorate.

In addition, a non-metallic filler that does not affect the communication characteristics of the IC tag module can be added to the molding material 16b, and it is particularly preferable to include a non-metallic filler having a density of 1.5 g / cm ³ or more.

Examples of the non-metallic filler include calcium carbonate (heavy) (CaCO ₂ , 2.7), calcium carbonate (soft) (CaCO ₂ , 2.6), calcium carbonate (colloid) (CaCO ₂ , 2.5- 2.6), calcium carbonate _{(chalk) (CaCO} 2, 2.7), silica powder _(SiO 2, 2.5 to 2.6), glass beads _(SiO 2, 2.4 to 2.5), diatomaceous earth _(SiO 2, 1.6~2.0), synthetic silica _{(wet) (SiO 2 · mH 2 O} , 2.0~2.1), synthetic silica _{(dry) (SiO 2 · mH 2 O} , 2. 0 to 2.2), calcium silicate (synthetic, _{amorphous) (mCaO · nSiO 2 · xH} 2 O, 2.0~2.2), calcium silicate _{(xonotlite) (6CaO · 6SiO 2 · H} 2 O, 2.7), calcium silicate _{Sutonaito) (CaO · SiO 2, 2.9} ), talc _{(3MgO · 4SiO 2 · H 2} O, 2.7~2.8), Atal Bal Jai preparative _{(5MgO · 8SiO 2 · 9H 2} O, 2.4) , Asbestos (chrysotile) (2.4-2.6), asbestos (asamosite) (3.1-3.3), asbestos (anthophynite) (2.8-3.1), carbon black (C 1.8-1.9), acetylene black (C, 1.9-2.0), furnace black (C, 1.8-1.9), graphite powder (C, 2.2), carbon fiber (1.7 to 1.9), silicon nitride (SiN, 3.2), silicon carbide (SiC, 3.1), antimony trioxide (Sb ₂ O ₃ , 5.5 to 5.9), disulfide Molybdenum (MoS ₂ , 4.8), iron oxide (Fe ₂ O ₃ , 5.2), oxidation Magnesium (MgO, 3.2 to 3.4), magnesium hydroxide (Mg (OH) ₂ , 3.2 to 3.4), basic magnesium carbonate (4MgO ₃ .Mg (OH) ₂ .4H ₂ O, 2.2-2.3), hydrotalcite _{(Mg 4.5 Al 2 (OH)} 13 CO 3 · 3.5H2O, 2.1), alumina _{(Al 2} O 3, _3.7~3.9) , zirconium oxide _(ZrO 2, 5.5), aluminum hydroxide _{(Al (OH) 3, 2.4} ), bentonite _{(Al 2 O 3 · 4SiO 2} · 2H 2 O, 2.0~2.6), Zeolite (Na (Al ₂ O ₃ · mSiO ₂ ) · H ₂ O, 2.1 to 2.2), kaolin clay (Al ₂ O ₃ · 2SiO ₂ · 2H ₂ O, 2.5 to 2.6), pyrophyllite (low stone _{clay) (Al 2 O 3 · 4SiO} 2 · ₂ O, 2.7 to 2.9) Serinaito _{(K2O · 3Al 2 O 3 ·} 6SiO 2 · 2H 2 O, 2.7~2.8), mica _{(phlogopite) (K 2 Mg 6 (Si} 3 Al) ₂ O ₂₀ (OH) ₄ , 2.7 to 3.0), mica (mascobite) (K ₂ Al ₄ (Si ₃ Al) ₂ O ₂₀ (OH) ₄ , 2.8 to 3.2), sulfuric acid Calcium (anhydrous) (CaSO ₄ , 2.9 to 3.0), zircon silicate (ZrSiO ₄ , 4.7), calcium sulfite (CaSO ₃ 1 / 2H ₂ O, 2.6), titanium oxide (rutile) ) _(TiO 2, 4.2~4.3), titanium oxide _(anatase) (TiO 2, _3.7~3.9), potassium titanate _{(K 2 O · 6TiO 2,} 3.3), barium sulfate _{(precipitated)} (BaSO 4 · _4.2~4.5), barium sulfate (Barite) (BaSO ₄ · 4.2 to 4.6), barium carbonate (BaCO ₃ , 4.3 to 4.4), barium titanate (BaTiO ₃ , 5.5 to 5.6), zinc oxide ( Wet type) (ZnO, 5.2) and zinc oxide (dry type) (ZnO, 5.4 to 5.7). In addition, the numerical value in a parenthesis shows each density (g / cm < ³ >).

  The IC tag module IC is a resin-molded antenna-integrated IC tag module called RFID (Radio Frequency Identification). Further, it is a passive IC tag that does not need a power supply and has all the functions of an IC tag as a single chip. For example, “M tag (ACCUWAVE-IM0505-SLI)” (5.45 mm square, manufactured by Dai Nippon Printing Co., Ltd.) A thickness of 0.76 mm), “Coil-on-chip RFID (ME-Y2000)” (2.5 mm square) manufactured by Hitachi Maxell, Ltd., and the like. These IC tag modules are molded with epoxy resin.

  In general, the communication distance of IC tags is determined by the frequency band used, antenna size, reader output power, etc., and the range of several mm to several meters is the mainstream, but the built-in antenna type cannot make the antenna size large, so the communication distance becomes short. Tend. In this example, a weak reader / writer has a communication distance of several mm to 30 mm.

  The optical reading unit 14 and the IC tag module sealing unit 16 are manufactured separately and then bonded together to form the optical disc 10. Or what formed the recording layer 12 in the base layer 11 and the IC tag module sealing part 16 may be bonded together, and the protective layer 13 may be formed after that.

  In manufacturing the IC tag module sealing portion 16, it is preferable to manufacture the IC tag module IC by sealing it simultaneously with the injection molding of the molding material. At this time, it is preferable to place the IC tag module at a predetermined position of the mold of the injection molding machine and perform injection molding at a molding temperature of 240 ° C. or less. This is for reducing damage during molding of the IC tag module IC and improving long-term reliability.

  Note that the IC tag module IC is preferably arranged in the IC tag module sealing portion 16 so as to be positioned in the inner peripheral portion Ai that is the inner peripheral region of the optical disc rather than the recording layer 12 that is the recording area Ar (see FIG. 1 (b)). Thereby, the recording layer 12 does not affect the communication of the IC tag module IC, and the unbalance as the optical disc 10 can be reduced. Further, it is more preferable that the IC tag module IC is arranged so that the center of gravity of the IC tag module IC is located on the inner peripheral side of the optical disc 10.

FIG. 3 shows a modification of the first embodiment. 3A is a front view of the optical disk as viewed from the optical reading side, and FIG. 3B is a cross-sectional view of the optical disk.
The optical disc 20 has a donut disk shape having an inner peripheral portion 28 that is a central hole of a circular gap (FIG. 3A), and an optical reading unit 24 as an upper layer and an IC tag module as a lower layer in the figure. The sealing part 26 is laminated | stacked (FIG.3 (b)). Further, in the front view shown in FIG. 3A, the recording area (outer peripheral part) Ar consists of the optical reading part 24, and the inner peripheral part Ai consists of a part of the IC tag module sealing part 26.

  The optical reading unit 24 is a donut disk-shaped flat plate having a center hole whose inner diameter is larger than that of the inner diameter part 28, and includes a base layer 21 on which pits are formed, and a recording layer 22 including a reflective film provided on the pits. And a protective layer 23 for protecting the recording layer 22 and securing an optical path for optically reading information from the recording layer 22 (FIG. 3B). The constituent materials of the base layer 21, the recording layer 22, and the protective layer 23 are the same as the constituent materials of the base layer 11, the recording layer 12, and the protective layer 13 in FIG. 1, but the base layer 21 is shown in FIG. It is thicker than the base layer 11 and is produced together with pit formation by injection molding.

  The IC tag module sealing portion 26 is a donut disk having a center hole which is an inner diameter portion 28, and a sealing inner peripheral portion 26i whose thickness is not less than the thickness of the IC tag module IC and not more than the thickness of the optical disc 20; It consists of the sealing outer peripheral part 26o thinner than the sealing inner peripheral part 26i (FIG. 3B). FIG. 3B shows a case where the thickness of the sealed inner peripheral portion 26 i becomes the thickness of the optical disc 20. The sealed inner peripheral portion 26i is a portion that does not contribute to optical reading, such as a clamp area. Further, the IC tag module sealing portion 26 is formed by the same molding material 26b as the molding material 16b constituting the IC tag module sealing portion 16 shown in FIG. 1, and the IC tag module IC is formed in the sealing inner peripheral portion 26i. Is sealed.

  Further, the IC tag module IC is arranged in the IC tag module sealing portion 26 so as to be positioned in the inner peripheral portion Ai that is the inner peripheral region of the optical disc rather than the recording layer 22 that is the recording area Ar (FIG. 3 ( b)) The recording layer 22 does not affect the communication of the IC tag module IC, and the imbalance as the optical disc 20 is also reduced.

  In the optical disc 20 shown in FIG. 3, the IC tag module can be embedded by increasing the thickness of the sealing inner peripheral portion 26i of the IC tag module sealing portion 26, and the mass of the center of gravity is reduced. It becomes possible to suppress. Further, the thickness of the inner peripheral portion 26i of the IC tag module sealing portion 26 is set to 1.2 mm, and the optical reading portion 24 makes the inner diameter hole corresponding to the size including the clamp area, so that the optical Positioning at the time of bonding the reading unit 24 and the IC tag module sealing unit 26 becomes easy. If the thickness of the optical reading unit 24 is set to 0.6 mm, a single-sided DVD having a reading surface having only one direction can be created.

  As described above, in the optical disc of the present invention, it is possible to give a product a strong ID against piracy such as extracting the IC tag by sealing the IC tag module. Therefore, security such as copyright protection, which is difficult to handle with a barcode, can be used as a billing ID.

  That is, in order to ensure the reliability of an electronic component such as a built-in IC tag module, it is desirable to block the outside air by, for example, resin sealing. In the present invention, the IC tag module is sealed in an optical disk molded body in order to mount the IC tag module on an actual product while ensuring the reliability as the electronic component. This not only reduces the cost of mounting the IC tag module, but also improves reliability and security.

  In particular, the optical disc 10 of the present embodiment is suitable for Blu-ray Disc (BD) -ROM and BD-RAM. For example, in the BD-ROM, an IC tag module can be used for content protection or billing. In the BD-RAM, an IC tag module can be used for security management.

Next, a second embodiment of the optical disc according to the present invention will be described.
FIG. 4 shows the configuration of the second embodiment of the optical disc according to the present invention. 4A is a front view of the optical disc, and FIG. 4B is a cross-sectional view of the optical disc. FIG. 4C is an enlarged view of the IC tag module.
The optical disc 30 has a donut disk shape having an inner peripheral portion 38 that is a central hole of a circular gap (FIG. 4A), an optical reading portion 34 that occupies the outer peripheral portion of the optical disc, and an inner peripheral portion of the optical disc. The IC tag module sealing portion 36 in which the IC tag module IC is sealed with a molding material having a density of 1.2 g / cm ³ or more is integrally molded (FIG. 4B). Therefore, the base portion of the optical reading unit 34 and the IC tag module sealing unit 36 are molded from the same molding material 36b. As the molding material 36b, an optical disk satisfying optical characteristics is used as the optical disk among the molding materials 16b and 26b in the first embodiment. The optical reading unit 34 has a recording layer and other necessary layer structures on the molded base portion.

  By the way, in the optical disc, the IC tag module is built in, so that the weight imbalance increases and the influence on the servo during high-speed rotation cannot be ignored. For example, in a DVD or the like, the amount of eccentric gravity is defined in order to reduce the burden on the servo system and enable more stable reproduction. The smaller this value is, the higher the stability at high speed rotation is, and the DVD is 1 g · cm. In an optical disc, in order to increase the recording / reproducing bit rate, high rotation of a double speed or higher is taken for granted, and it is desirable that the unbalanced weight of the disc is small. Since the unbalance force due to rotation is proportional to the square of the angular velocity, the amount of eccentric gravity is ¼ of the reference speed, that is, 0.25 g · cm or less in order to perform stable reproduction at double speed.

Here, the unbalance force due to rotation is expressed by the following equation (1).
(Unbalance force due to rotation) = (Unbalance weight) × (Distance from center) × (Angular velocity) ² (1)

  In other words, if the unbalance weight is the same at the same position and rotational speed, the value can be reduced by positioning the IC tag module on the inner periphery of the disk if the unbalance weight is the same, but the disk center is the central hole and this part This is not possible and there is a suitable mounting area.

The unbalance weight is expressed by the following formula (2).
(Unbalance weight) = ((IC tag density) − (resin density)) × (IC tag volume) (2)

  In order to reduce the unbalance weight, it is necessary to reduce the difference between the IC tag density and the resin density, or to reduce the size of the IC tag module. When the IC tag module to be used is determined, the value can be reduced by using a resin having a density close to that of the IC tag module.

Here, the density of the IC tag module IC used in the present invention is determined by its components, but the main components are 2.33 g / cm ^{3 for} the IC tag chip (silicon) and 1.5 for the antenna substrate (glass epoxy). 1.7 g / cm ³ and package mold (epoxy resin) 1.8-1.9 g / cm ³ . Since all the basic components are heavier than the plastic used for general optical disc molding, the density of the IC tag module is higher than that of the optical disc resin. For example, the density of “M tag (ACCUWAVE-IM0505-SLI)” (5.45 mm square, thickness 0.76 mm) manufactured by Dai Nippon Printing Co., Ltd. is 2.0 g / cm ³ .

Molding materials (resins) used in optical discs are not only mechanical, but optical properties are important, so PC (polycarbonate, density 1.2 g / cm ³ ) and COP (cycloolefin polymer, density) have high transmittance at short wavelengths. 1.01 g / cm ³ ) or the like is used, and the additive cannot be used in terms of optical characteristics. Even considering a high-density polycarbonate, the density difference from the IC tag module is 0.8 g / cm ³ . Here, among the molding material 36b used in the present invention, the material containing aliphatic polyester has a higher density than these. For example, a thermoplastic resin mainly made of polylactic acid (manufactured by Mitsui Chemicals, Inc .: H100J) has a density of 1.33 g / cm ³ and is advantageous for reducing the unbalanced weight.

  Further, in the optical disk molded body shown in FIGS. 4A and 4B, when considering a 12 cm disk, the inner diameter portion 38 is a center hole of φ15 mm, and the IC tag module cannot be physically mounted within a radius of 7.5 mm. This is an important area. Further, the outer periphery is a signal recording area from φ45 mm (radius 22.5 mm), and the ROM disc is not suitable as a mounting area because the communication distance of the IC tag is shortened by the metal reflection film. Therefore, when the manufacturing margin is taken into consideration, a radius of 8 to 22 mm is considered as a suitable IC tag module mounting area. Further, considering the irregular shape on the inner periphery, the disc clamp area 36a which is a flat portion is suitable for the IC tag module arrangement, and a radius of 11.0 to 16.5 mm is considered to be more suitable.

  Further, in the IC tag module IC, since the density of the IC chip (silicon chip) C is the highest, the center of gravity may not necessarily be the center of the IC tag module. In that case, by arranging the center of gravity of the tag to be on the inner peripheral side of the optical disk, the weight imbalance can be further reduced, and the optical disk can be rotated stably (FIG. 4C).

The results of verifying the effect of the optical disc of the present invention will be shown below.
(Example 1)
In this example, the optical disk 10 shown in FIG. 1 was manufactured under the following conditions, and the relationship between the reproduction speed and the position where the IC tag module is allowed on the optical disk was examined.
(1) Materials used / IC tag module IC: “M tag (ACCUWAVE-IM0505-SLI)” manufactured by Dai Nippon Printing Co., Ltd. (integrated antenna with communication frequency of 13.56 MHz)
..Weight: 0.047g
..Volume: 0.023 cm ³
・ ・ Size: 5.45mm square ・ ・ Thickness: 0.75mm
.. Density: 2.04 g / cm ³
Molding material 16b: Thermoplastic resin (manufactured by Mitsui Chemicals, Inc .: H100J) using polylactic acid as the main raw material (density 1.33 g / cm ³ )
(2) Optical disk manufacture First, the IC tag module sealing part 16 was produced. Specifically, the injection molding was performed with the molding material 16b using an injection molding machine (NEX500, manufactured by Nissei Plastic Industry Co., Ltd.) with a clamping pressure of 50 tons. Here, assuming a BD-ROM, a molded body of the disc-shaped IC tag module sealing portion 16 having an outer diameter of 12 cm and a thickness of 1.0 mm is formed, and then the tag shape provided in the clamp area of the molded body The IC tag module IC was embedded in the recess and sealed with UV resin to form an IC tag module sealing portion 16. At this time, the IC tag module IC was manufactured by changing the recessed position where it was embedded.
Next, the IC tag module sealing portion 16 having a thickness of 1.0 mm and the pit portion including the base layer 11 and the recording layer 12 having a thickness of 0.1 mm are bonded together, and then coated with a UV resin, thereby protecting the protective layer. 13 was formed to complete the optical disk 10. It was confirmed that there was no problem in the disk shape and IC tag communication.

In Example 2, the molding material was changed to PC (polycarbonate, density 1.2 g / cm ³ ), and in Comparative Example 1, COP (cycloolefin polymer, density 1.01 g / cm ³ ). An optical disk was manufactured under the same conditions as in the example.

  The obtained optical disc sample is mounted on an optical disc playback apparatus, and the playback speed is changed to 1 × DVD, 2 ×, 3 ×, 4 ×, and the position of the IC tag module that satisfies the specifications of the eccentric gravity center at each playback speed is determined. investigated. The spec of the eccentric gravity center by the IC tag module IC was set to 1/10 of the spec of the optical disc, and the center of gravity position of the IC tag module IC was estimated as the tag center. In other words, since the eccentric gravity center spec of the optical disk at 1 × DVD is 1 g · cm or less, the eccentric gravity center specification by the IC tag module IC is set to 0.1 g · cm or less. Further, since the eccentric gravity center specification of the optical disc at the DVD double speed is 0.25 g · cm or less, the eccentric gravity center specification by the IC tag module IC is set to 0.025 g · cm or less. Further, since the eccentric gravity center specification of the optical disc at DVD triple speed is 0.11 g · cm or less, the specification of the eccentric gravity center by the IC tag module IC is set to 0.011 g · cm or less. In addition, since the eccentric gravity center specification of the optical disc at the DVD quadruple speed is 0.06 g · cm or less, the specification of the eccentric gravity center by the IC tag module IC is set to 0.006 g · cm or less.

  Table 1 shows the evaluation results. Here, the position of the IC tag module is indicated by the distance from the center of the optical disc, with the positions of the outer peripheral end and inner peripheral end of the IC tag module IC being the outermost periphery and the innermost periphery, respectively. Note that a preferable range of the optical disk as the arrangement of the IC tag module is a range in which the inner peripheral end is on the outer peripheral side with respect to the inner diameter portion 18 and the outer peripheral end is on the inner peripheral side with respect to the recording layer 12. The circumference is 8 mm or more and the outer circumference is 22 mm or less.

  In Table 1, if the tag is mounted on the inner peripheral side of the optical disc from the outer peripheral end of the IC tag module, the influence of unbalance due to the IC tag module mounting can be sufficiently reduced. For example, in order to clear the double speed target in Comparative Example 2, it must be arranged on the inner circumference side from the radius of 13.2 mm, but since the innermost circumference edge is located at 7.8 mm, the margin with the center hole is very large. It is running low. When considering the correspondence to the double speed, the comparative example 1 requires a very high position with a small margin on the inner diameter of the disk, but the inner circumference and the outer circumference are more than the density of the PC used in the second embodiment. Margin can be secured. In Example 1, since the allowable area of the IC tag module mounting position is wider, it is possible to match the clamp area of a more preferable arrangement area.

The resin density of Example 1 is 1.33 g / cm ³ , but the density of the molding material can be adjusted with an additive such as a filler. However, the metal filler cannot be used because it affects the communication characteristics of the IC tag module. Communication characteristics by using plant fibers such as cotton and hemp (density is about 1.5 g / cm ³ ), inorganic (non-metallic) filler such as calcium carbonate and talc (density is about 2.7 g / cm ³ ) The density could be increased without any effect.

1 is a schematic diagram showing a configuration in a first embodiment of an optical disc according to the present invention. It is a figure which shows the relationship between a molding material density and unbalance weight. It is the schematic which shows the modification in 1st Embodiment of the optical disk which concerns on this invention. It is the schematic which shows the structure in 2nd Embodiment of the optical disk which concerns on this invention.

Explanation of symbols

10, 20, 30 ... optical disc, 11, 21 ... base layer, 12, 22 ... recording layer, 13, 23 ... protective layer, 14, 24 ... optical reading unit, 16, 26 , 36 ... IC tag module sealing part, 16, 26b, 36b ... molding material, 26i ... sealing inner peripheral part, 26o ... sealing outer peripheral part, 18, 28, 38 ... Inner diameter part, 36a ... clamp area, Ai ... inner circumference part, Ar ... recording area (outer circumference part), IC ... IC tag module

Claims (7)

In an optical disc containing an IC tag module,
An optical disc comprising: an optical reading portion having a recording layer; and an IC tag module sealing portion in which the IC tag module is sealed with a molding material having a density of 1.2 g / cm ³ or more.   The optical disk according to claim 1, wherein the molding material is a thermoplastic resin alone or a material containing the thermoplastic resin.   The optical disk according to claim 2, wherein the thermoplastic resin contains an aliphatic polyester. The optical disk according to claim 1, wherein the molding material contains a nonmetallic filler having a density of 1.5 g / cm ³ or more.   The optical disc according to claim 1, wherein the IC tag module is arranged in an inner peripheral area of the optical disc from the recording layer.   2. The optical disk according to claim 1, wherein the optical reading unit is an upper layer and the IC tag module sealing unit is a lower layer.   The IC tag module sealing portion includes an inner peripheral portion whose thickness is equal to or greater than the thickness of the IC tag module and equal to or less than the thickness of the optical disc, and an outer peripheral portion thinner than the inner peripheral portion. The optical disc according to claim 6, wherein the IC tag module is sealed.

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