JP2005071575A - Optical disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure a wide arrangement area for a small memory device with a communication function called IC tag and RF tag. <P>SOLUTION: For example, in a disk such as BD (blue laser disk), which performs optical reading from a cover layer side, a chip-on optical disk arranging a IC memory chip which constitute the small memory device a with communication function, and an antenna coil is provided on or in a substrate opposite to an optical reading surface. In the optical disk, since the cover layer side of the disk is the optical reading surface, the IC memory chip and the antenna coil can be arranged over a wide range on a substrate side. Moreover, as a method for providing the IC memory chip and the antenna coil, such a structure that these are provided in one label sheet and the label sheet is attached on the cover layer of the disk may be adopted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical disc on which a micro IC memory chip having a wireless function called an IC tag or an RF tag is mounted, and various data can be stored and read in the micro IC memory chip.

In recent years, various types of micro IC memory chips having a wireless function have been put into practical use. Even in optical disks such as CD (compact disc) and DVD (digital versatile disc), such micro IC memory chips and antenna coils for communication are used. It has been proposed that various management data and the like are stored and applied to various uses.
As a use of such a micro IC memory chip, for example, by giving a unique ID to the disk, it can be used for managing the disk, preventing theft, or by providing a writable memory to store various information. By making it possible to record appropriately, it is possible to hold contents, data, file charges, rights information, and the like. In addition, by having a secret key, it is possible to authenticate with PKI etc. by a processing circuit such as a CPU, and supply decryption keys for encrypted contents, data, and files only to a party who is recognized as legitimate. It is possible to provide a security function such as allowing the right information to be updated.
Therefore, if the information by such an IC memory chip is separated from the optical disk, it is difficult to correspond to data and content, so it is desirable to integrate the IC memory chip with the optical disk.

First, a conventional example in which such a micro IC memory chip is integrally mounted on a CD will be described (for example, see Patent Document 1).
FIG. 7 is a plan view and a cross-sectional view showing a configuration of a conventional CD, and FIG. 8 is a plan view and a cross-sectional view showing a mounting example of a micro IC memory chip and an antenna coil on the CD shown in FIG.
As shown in FIG. 7B, in this CD 100, a signal recording surface 111 such as pit rows is formed on the upper surface of a transparent substrate 110 made of polycarbonate or the like, and a reflection film 120 made of aluminum or the like is formed thereon. A resin protective film 130 is formed on the reflective film 120.
In addition, a center portion 140 into which a disc chuck (not shown) is fitted is provided at the center of the CD 100. Note that the plate thickness of the CD 100 is defined as a value of about 1.2 mm as a whole, for example.
In such a CD 100, the light beam 160 is irradiated from the transparent substrate 110 side, and the pit row is read by the reflected light from the reflective film 120.

When the above-described IC memory chip and antenna coil are provided on such a CD 100, it is difficult to provide the recording film in the recording region through which the light of the transparent substrate 110 transmits, and the reflective film 120 and the protective film 130 have a film thickness. Therefore, it is difficult to embed them in these films. For example, as shown in FIG. 8, the center portion 140 is provided on the surface opposite to the disk reproduction surface. That is, in the example of FIG. 8, the micro IC memory chip 170 is provided on the surface of the center portion 140 opposite to the disk reproducing surface, and passes along the inner periphery of the center portion 140 through the micro IC memory chip 170. An antenna coil 180 is arranged in a ring shape.
Therefore, in this CD 100, the lower surface side in FIG. 8B is the disc reproduction surface 100A, and the upper surface side is the chip reproduction surface 100B.

Next, a conventional example in which a similar micro IC memory chip is integrally mounted on a DVD will be described (for example, see Patent Document 2).
FIG. 9 is a plan view and a cross-sectional view showing the configuration of a conventional DVD, and FIG. 10 is a plan view and a cross-sectional view showing a mounting example of a micro IC memory chip and an antenna coil on the DVD shown in FIG.
As shown in FIG. 9B, this DVD 200 has a structure in which an adhesive layer 230 made of an adhesive resin is sandwiched between two transparent substrates 210 and 220 made of polycarbonate or the like. On the side, signal recording surfaces 211 and 221 are formed by pit rows or the like, and reflection films 240 and 250 made of aluminum or the like are formed thereon.
Note that the plate thickness of the DVD 200 is specified to a value of about 1.2 mm as a whole, for example.

In such a DVD 200, the light beam 280 is irradiated from the transparent substrates 210 and 220 on both sides, and the pit row is read by the reflected light from the reflection films 240 and 250.
When the above-described IC memory chip and antenna coil are provided in such a DVD 200, it is difficult to provide the information in the information recording area, and since the structure does not have a center portion like the CD 100, for example, FIG. As shown in FIG. 4, the disk is provided in a state of being embedded in the joint portion of the transparent substrates 210 and 220 at the center of the disk. That is, a minute IC memory chip 290 is provided near the center of the DVD 200, and an annular antenna coil 300 having a concentric structure with respect to the DVD 200 is disposed through the minute IC memory chip 290.
Therefore, in this DVD 200, the lower surface side in FIG. 10B is the disc reproduction surface 200A, and the upper surface side is the chip reproduction surface 200B.
Japanese Patent Laid-Open No. 2001-210057 JP-A-9-245381

Therefore, in the conventional optical disk, when an IC memory chip or an antenna coil is provided, it is necessary to select and arrange a very limited area from the relationship of the light transmission area, the film thickness condition, and the like. There is a problem that it is often disadvantageous in terms of design and manufacturing.
SUMMARY OF THE INVENTION An object of the present invention is to provide an optical disc that can secure a wide arrangement area of a small memory device with a communication function called an IC tag or an RF tag, can be easily designed and manufactured, and can improve functions. .

  To achieve the above object, an optical disc according to the present invention includes a substrate having a signal reading surface on a first surface, a reflective layer provided on the signal reading surface of the substrate, and a cover provided on the reflective layer. And a small memory device with a communication function is provided on the side opposite to the signal reading surface of the substrate.

  According to such an optical disc of the present invention, in a disc structure for reading signals by providing a reflection layer and a cover layer on the signal reading surface side of the substrate, a small memory having a communication function on the side opposite to the signal reading surface of the substrate. Since the device is provided, it is possible to secure a wide arrangement area of the small memory device with a communication function without worrying about the range of the recording area, etc., and it is easy to design and manufacture the optical disc and achieve improvement of the function. .

In the embodiment of the present invention, a small optical disc with a communication function is provided on a substrate opposite to the optical reading surface or in a substrate, such as a BD (blue laser disc), for optical reading from the cover layer side. A chip-on-optical disk in which an IC memory chip and an antenna coil constituting a memory device are arranged is provided. In this optical disk, since the cover layer side of the disk is an optical reading surface, an IC memory chip and an antenna coil can be arranged over a wide range on the substrate side.
In addition, a board | substrate can be said to be a mere foundation, for example, in the case of BD, it has a thickness of 1.1 mm. Therefore, as long as the disc thickness and weight standards are satisfied, the substrate may be processed on or in the substrate, and the IC memory chip and the antenna coil can be freely arranged.
Further, as a method of providing the IC memory chip and the antenna coil, a structure in which these are provided in one label and this label is attached on the substrate opposite to the optical reading surface of the disc may be adopted. .

1A and 1B are a plan view and a cross-sectional view showing a configuration of a BD provided with an IC memory chip and an antenna coil according to Embodiment 1 of the present invention.
As shown in FIG. 1, in the BD 400 of the first embodiment, a signal recording surface 411 such as a pit row is formed on the lower surface (first surface) of a substrate 410 made of polycarbonate or the like, and a reflection layer made of a layer such as aluminum is formed thereon. A film 420 is formed. A transparent resin cover layer 430 is formed on the reflective film 420.
Further, a center portion 440 to which a disc chuck (not shown) is fitted is provided at the center of the BD 400. Note that the overall thickness of the BD 400 is, for example, a value of about 1.2 mm, the thickness of the substrate 410 is 1.1 mm, and the thickness of the cover layer 430 is 0.1 mm.
In the BD 400, the light beam 450 is irradiated from the cover layer 430 side, and the pit row is read by the reflected light from the reflective film 420.

In the BD 400, a micro IC memory chip 460 constituting a small memory device with a communication function and an antenna coil 470 connected to the micro IC memory chip 460 are embedded on the upper surface (second surface) side of the substrate 410. Has been placed.
Therefore, in the BD 400, the lower surface (first surface) side in FIG. 1B is the disc reproduction surface 400A, and the upper surface (second surface) side is the chip reproduction surface 400B.
As shown in the figure, the micro IC memory chip 460 is provided in the back surface area corresponding to the signal recording area of the signal recording surface 411, and the antenna coil 470 is concentric with the BD 400 and almost half of the BD 400. It is provided in an annular shape having a radius of. That is, the radius of the antenna coil 470 is formed larger than that of the conventional antenna coil shown in FIGS. 8 and 10 and has a high communication function. As a result, it is possible to obtain a sufficient function for receiving a high-frequency weak signal and a power radio wave.
In this example, both the micro IC memory chip 460 and the antenna coil 470 are embedded in the substrate 410. However, both or one of the micro IC memory chip 460 and the antenna coil 470 is uneven. It may be a structure mounted on the upper surface of the substrate 410 within an allowable range of the shape. The shape of the antenna coil 470 is not limited to the one-turn shape as shown.

As a function of a small memory device with a communication function, it is desirable that information stored in a memory IC can be read without being applied to a disk drive, and data on the disk can be read by some method such as using an unauthorized disk drive. Since it is often read, it is necessary to provide sufficient confidentiality. In other words, the data recorded on the disc is not really highly confidential information. Therefore, in the small memory device of this example, the memory for storing the key information encrypted to protect the information, the CPU for mutual authentication with the outside, communicate with the outside, and are necessary for the operation of the IC. It is assumed that the device has a built-in analog circuit for obtaining power. In addition, if it has the above structure, it is also possible to comprise by elements other than IC.
Also, the disc is not necessarily in a cartridge, etc., and it is not known how (at what angle) the playback device is chucked, and it rotates inside the device, so it is not in contact with the outside. An antenna coil 470 is provided to communicate and obtain the power required for these.

FIG. 2 is a plan view and a cross-sectional view showing the structure of a BD provided with an IC memory chip and an antenna coil according to Embodiment 2 of the present invention.
As shown in FIG. 2, in the BD 500 of the second embodiment, as in the example shown in FIG. 1, a signal recording surface 511 by pit rows or the like is formed on the lower surface (first surface) of the substrate 510, and aluminum is formed thereon. A reflective film 520 is formed by the method described above. A cover layer 530 made of transparent resin is formed on the reflective film 520. A center portion 540 is provided at the center of the BD 500.
In the BD 500, the light beam 550 is irradiated from the cover layer 530 side, and the pit row is read by the reflected light from the reflective film 520.

In the BD 500, a resin label 580 is attached to the upper surface (second surface) side of the substrate 510, and the micro memory device that constitutes a small memory device with a communication function is sealed in the label 580. An IC memory chip 560 and an antenna coil 570 connected to the micro IC memory chip 560 are arranged in an embedded structure.
Therefore, in the BD 500, the lower surface (first surface) side in FIG. 2B is the disc reproduction surface 500A, and the upper surface (second surface) side is the chip reproduction surface 500B. As shown in the figure, the micro IC memory chip 560 in the label 580 is provided in the back surface area corresponding to the signal recording area of the signal recording surface 511, the antenna coil 570 is concentric with the BD 500, and It is provided in an annular shape having a radius approximately half that of BD500. That is, similarly to the example shown in FIG. 1, the antenna coil 570 is formed with a larger diameter than the conventional antenna coil shown in FIGS. 8 and 10 and has a high communication function. As a result, it is possible to obtain a sufficient function for receiving a high-frequency weak signal and a power radio wave.
The thickness of the substrate 510 is 1.1 mm including the thickness of the label 580, and is within the standard range.

  FIG. 3 is a cross-sectional view showing a state in which a label 580 provided with a micro IC memory chip 560 and an antenna coil 570 is attached to the substrate 510. For example, when the adhesive or temperature condition permits, the label 580 is attached and fixed to the substrate 510 by thermal welding.

In the second embodiment, the example in which both the micro IC memory chip 560 and the antenna coil 570 are provided on the label 580 is shown. However, any one of them may be provided on the label and the other may be provided on the substrate. is there.
FIG. 4 shows an example in which a micro IC memory chip is embedded in a substrate and an antenna coil is provided on a label. In addition, the same code | symbol is attached | subjected about the same component as the example shown in FIG. 2, and description is abbreviate | omitted.

Further, for example, in the example shown in FIG. 2, there may be a case where wireless communication using the antenna coil does not function well due to the influence of the reflective film 520. Therefore, for example, it is effective to use a method of interposing a high permeability sheet between the label 580 and the substrate 510 to avoid the influence of the reflective film 520 on the radio.
FIG. 5 shows a specific example. As shown in the drawing, a high permeability sheet 590 corresponding to the area of the antenna coil 570 is interposed between the label 580 and the substrate 510, and the influence of the reflective film 520 on the radio is affected. It is avoiding. As the high magnetic permeability sheet material, for example, a composite material in which a soft magnetic powder plastic is blended at a predetermined ratio is formed into a thin film shape. Further, the permeability can be further increased by providing an insulating layer (not shown) on the surface of the high permeability sheet 590 that contacts the antenna coil. In addition, the same code | symbol is attached | subjected about the same component as the example shown in FIG. 2, and description is abbreviate | omitted.

FIG. 6 shows another specific example. Instead of the high permeability sheet 590 used in FIG. 5, at least a part of the substrate 510 is formed of a high permeability material 600. As a molding method, for example, the substrate 510 is formed in two colors to fill the inside of the substrate 510 made of synthetic resin such as polycarbonate with a high magnetic permeability material. As a result, similarly to the high magnetic permeability sheet 590 shown in FIG. In this example, since the high magnetic permeability material is covered with polycarbonate, this polycarbonate serves as an insulating layer between the antenna coil. Furthermore, in this example, there is no possibility of peeling because the sheet material is not stuck.
In the above example, the BD is described as an example of the optical disk whose cover layer side is the optical reading surface. However, the present invention can be similarly applied to other optical disks whose cover layer side is the optical reading surface. Further, the present invention is not limited to the above-described read-only optical disc but can be similarly applied to a recordable optical disc. In this case, the reflective film includes a recording layer (for example, the recording layer is superimposed on the reflective film), and data can be recorded by various methods. In general, a recordable disc does not have a data pit row on the substrate, but has a groove and an address pit.

In the optical disc of the present example as described above, the restriction on the area where the IC memory chip and the antenna coil are arranged becomes very loose, so that the design and manufacturing become easy, and the reliability can be improved and the manufacturing cost can be reduced. It becomes.
In addition, when the area restriction is loose, a large antenna coil (radius and number of turns) can be configured, communication efficiency and power efficiency can be improved, and a large amount of data can be processed at high speed.
In addition, since the thickness restriction is loose, the distance from the reflective film (metal) of the antenna coil can be increased, and the number of choices increases in selecting the material of the antenna coil. This also contributes to improvement of reliability, reduction of manufacturing cost, improvement of communication efficiency, and power efficiency.

It is explanatory drawing which shows the structure of the optical disk (BD) by Example 1 of this invention. It is explanatory drawing which shows the structure of the optical disk (BD) by Example 2 of this invention. It is explanatory drawing which shows the mode of the label affixing operation | work in the optical disk shown in FIG. It is explanatory drawing which shows the structure of the optical disk (BD) by Example 3 of this invention. It is explanatory drawing which shows the structure of the optical disk (BD) by Example 4 of this invention. It is explanatory drawing which shows the structure of the optical disk (BD) by Example 5 of this invention. It is explanatory drawing which shows the structure of the conventional CD. It is explanatory drawing which shows the structure at the time of providing an IC memory chip and an antenna coil in CD shown in FIG. It is explanatory drawing which shows the structure of the conventional DVD. It is explanatory drawing which shows the structure at the time of providing an IC memory chip and an antenna coil in DVD shown in FIG.

Explanation of symbols

  400 ... BD, 410 ... Substrate, 411 ... Signal recording surface, 420 ... Reflective film, 430 ... Cover layer, 440 ... Center part, 450 ... Light beam, 460 ... Micro IC memory chip, 470 …… Antenna coil.

Claims (13)

A substrate having a signal reading surface on the first surface, a reflective layer provided on the signal reading surface of the substrate, and a cover layer provided on the reflective layer;
Provided a small memory device with a communication function on the side opposite to the signal reading surface of the substrate,
An optical disc characterized by the above.   2. The optical disk according to claim 1, wherein the small memory device with a communication function includes an IC chip and an antenna coil.   2. The optical disk according to claim 1, wherein the small memory device with a communication function is arranged in an area corresponding to a signal recording area on the substrate.   The optical disk according to claim 2, wherein at least one of the IC chip and the antenna coil is embedded in the substrate.   3. The optical disk according to claim 2, wherein at least one of the IC chip and the antenna coil is mounted on a second surface opposite to the first surface of the substrate.   3. The optical disc according to claim 2, wherein the IC chip is embedded in the substrate, and the antenna coil is mounted on a second surface opposite to the first surface of the substrate.   2. The optical disk according to claim 1, wherein a label having a small memory device with a communication function is attached to a second surface opposite to the first surface of the substrate.   8. The optical disk according to claim 7, wherein the small memory device with a communication function includes an IC chip and an antenna coil.   9. The optical disk according to claim 8, further comprising a high permeability sheet provided corresponding to the area of the antenna coil between the label and the substrate.   9. The optical disk according to claim 8, wherein a part of the substrate is made of a high magnetic permeability material.   9. The optical disc according to claim 8, wherein at least one of the IC chip and the antenna coil is provided on the label.   9. The optical disc according to claim 8, wherein the IC chip is embedded in the substrate, and the antenna coil is provided on the label.   The optical disk according to claim 1, wherein the reflective layer includes a recording film capable of writing a signal.

Images