WO2003017265A1

WO2003017265A1 - Recording medium

Info

Publication number: WO2003017265A1
Application number: PCT/JP2002/007620
Authority: WO
Inventors: Nobutake Kagami
Original assignee: Sony Corporation
Priority date: 2001-08-21
Filing date: 2002-07-26
Publication date: 2003-02-27
Also published as: JP2003059115A

Abstract

A recording medium with reduced unbalance during the rotation and having a disk-like optical recording part and an IC chip mounted on the same substrate. The recording medium which has the disk-lie optical recording part (21) and the IC module (31) mounted on the same substrate (11) and is rotated with the center of the optical recording part (21) as the center (d) of rotation, characterized in that the center of gravity (o) of the recording medium agrees with the center (d) of rotation of the recording medium, i.e., the center of a hole part (12) in the optical recording part (21).

Description

Details ^: recording media

The present invention relates to a recording medium in which a disc-shaped optical recording section and an IC chip are mounted on the same substrate. Background art

In recent years, the playback infrastructure for CD-type discs such as compact discs for music (CDDA) and CD-Read Only Memory (CD-ROM) has become widespread. Following this trend, write-once or rewritable optical disks such as CD-Recordable (CD-R) and CD-ReWriteble (CD-RW) have become popular, and now 3.5-inch flexible disks (MFD) Has become widely accepted as a relatively inexpensive storage device.

Under these circumstances, card-shaped compact discs (CDs), namely CDDA and CD-ROM, have been developed, and instead of business cards, card-shaped CD-ROMs that record self-introductions, company descriptions, catalogs, etc. Has also appeared.

Although CD-Rs and CD-RWs, which have not yet been widely used but are expected to grow in the future, are also on sale, a printable type that can print the label side with an ink jet printer has been released. Inkjet printers corresponding to this are also available from several companies. Thus, with the spread of circular CD-based optical disks, it can be said that card-shaped CD-based disks have also begun to spread.

At the same time, the spread of IC cards with IC chips mounted on card-like substrates is accelerating. In particular, non-contact IC cards that do not touch the terminal device and the IC chip are: ①High security by advanced encryption processing and mutual authentication ②No physical contact between the terminal for reading and writing data overnight It has the following features: (3) low consumption, (3) high communication speed, and short processing time (approximately 1/10 of contact type).

The applications are also diverse, including (1) library management of books, rental management, (2) management of video ZCD / DVD rental stores, inventory management, (3) event venues, amusement parks, sports facilities ( For example, entry / exit management for ski lifts), (4) medical reception management, medical record management, medical record shelf search, (5) business VTR library management, (6) home delivery distribution management, (7 ) Customer management at cleaning stores, (8) Passenger luggage management at airports, (9) Security applications in various cases, (10) Inventory management in warehouses, (1 1) Electric train tickets, (1 2) It can be used for parking lot ticket applications, (13) toll road charging system applications, etc.

However, the data recording capacity of contactless IC cards is about 8 kBy te at the largest, and even if they are widely used, low-capacity data of 1 kBy te or less are the mainstream due to price restrictions, so multimedia It is not suitable for storing images, audio, and video.

Although non-contact IC cards are expected to be used in a variety of applications, their use has often been limited due to the limited storage capacity.

Therefore, a card-shaped recording medium in which a non-contact IC chip and an optical disk are mounted on the same substrate, especially a CD with a read-write infrastructure It is considered that the value of commercialization is high because the system equipped with a system-based optical disk is relatively inexpensive, has a large recording data capacity, and is excellent in portability and convenience due to its card form. , Attention has been paid.

Further, since it can be used in a conventional optical disk device, the manufacturing cost of peripheral devices can be reduced.

For an optical disk with a non-contact type IC chip mounted, an optical disk with a non-contact type IC chip mounted at the center of the disc-shaped optical disk, that is, at the outer peripheral edge of the hole for inserting the rotation center axis. It is disclosed in Japanese Patent Application Laid-Open No. 8-161790.

Japanese Patent Application Laid-Open No. HEI 10-101 discloses a recording medium in which a recording unit such as an optical disk or a magnetic disk and an integrated circuit (IC chip) are mounted on a card-like substrate, and a holder means for loading the recording medium into a disk drive. — It is disclosed in Japanese Patent Publication No. 171961.

By the way, recently, the playback speed of CD-ROM drives also tends to be faster, such as 24x CAV (constant angular velocity), 32x speed, or 50x speed CAV. In addition, the recording speed of write-once CD-Rs is 16x CLV (constant linear velocity). In addition, the recording speed of rewritable CD-RWs has been increased from 4x CLV to 10x CLV.

With the speeding up of such drives, there is a demand for a recording medium loaded in the drive to have a balance that can withstand high-speed rotation.

However, the invention disclosed in Japanese Patent Application Laid-Open No. 8-161790 merely mounts an IC chip on an optical disk, and does not disclose suppression of imbalance due to mounting the IC chip. Therefore, the optical disk with the IC chip is mounted on the disk drive. When it was loaded and rotated, there was a possibility that imbalance would occur and stable recording or playback operation could not be performed.

Also, in the invention disclosed in Japanese Patent Application Laid-Open No. H10-171696, an optical disk or a magnetic disk and an IC chip are mounted on a card-shaped substrate. There is no mention of reducing the balance. As a result, the recording medium becomes unbalanced during rotation, and there is a possibility that an uncorrectable data error may occur in the recording or reproduction of the recording medium, and the operation may not be performed stably.

Further, in the present invention, it is considered that by mounting the recording medium on the holder means, the imbalance of the recording medium during rotation when the recording medium is loaded on the disk drive is reduced. Means had to be provided. Disclosure of the invention

The recording medium of the present invention comprises a disc-shaped optical recording unit and an IC chip mounted on the same substrate, and rotates about the center of the optical recording unit as a rotation center. It is characterized by the fact that it is aligned with the center of rotation.

According to the recording medium having the above configuration, it is possible to suppress the occurrence of vibration due to imbalance when the recording medium is loaded in the disk drive and rotated, so that the recording medium can be stably recorded or reproduced. Is possible. BRIEF DESCRIPTION OF THE FIGURES

1A to 1B are a plan view and an AA ′ sectional view showing an example of the recording medium of the first embodiment. 2A to 2B are a plan view and a cross-sectional view taken along the line CC 'showing an example of the recording medium of the second embodiment. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the recording medium of the present invention will be described in detail.

(First Embodiment)

FIG. 1A is a plan view of the recording medium of the first embodiment, and FIG. 1B is a cross-sectional view taken along the line AA ′ in FIG. 1A.

As shown in FIG. 1A, the recording medium in the present embodiment is a rectangular plate. For example, a disc-shaped optical recording unit 21 and an IC module 31 are mounted on a substrate 11 formed into a card shape. It was done.

It is assumed that the recording medium in the present embodiment is in the form of a card of 58 mm × 85 mm and has a thickness of 1.2 mm.

At the center of the optical recording unit 21, a hole 12 into which a rotation center axis is inserted when a recording medium is loaded into a disk drive is formed through the substrate 11.

Here, it is assumed that the hole diameter of the hole 12 is 15 mm.

In the present embodiment, an example in which the center c of the recording medium coincides with the center of the hole 12 of the optical recording unit 21 will be described. Specifically, in FIG. 1A, the intersection of two rectangular lines D and E drawn on the rectangular substrate 11 is defined as the center c of the recording medium. Hereafter, it is simply referred to as center c.

The recording medium of the present embodiment is loaded into a disk drive, and the recording medium is rotated with the center of the hole 12 (that is, the center c) as the center of rotation d. By irradiating, the optical recording unit 21 has information Information is recorded. The optical recording unit 21 is reproduced by picking up the reflected light of the laser light h from the optical recording unit 21. The optical recording unit 21 is configured according to the specification of the CD-R. Shall be As shown in FIG. 1B, when the surface of the substrate 11 on which the laser beam h is incident is the first surface 13 and the back surface is the second surface 14, the optical recording section 21 is formed on the second surface 14 side.

Specifically, an optical pickup guide groove (group portion) (not shown) is formed along the recording track of the optical recording portion 21 located at the center of the second surface 14. In the group part, a wobble (meandering) is formed, and time information for addressing is recorded. In the part (lead-in area 25) that is accessed first in the group section, information indicating the start and end of the group section, the type of disk, information on the optimum recording conditions, etc. are recorded in advance in the page of the group section. Configuration. A lead-out area 26 is provided at the end of the dull section. On the upper surface of the concave / convex pattern (not shown) of the group portion formed on the optical recording portion 21 on the second surface 14, a recording layer 22 made of a cyanine-based material and a reflective layer 23 made of a silver alloy are provided. A protective film layer 24 made of a UV-curable resin is applied to the entire surface of the second surface 14 and sequentially laminated. Further, a label printing layer (not shown) is formed on the protective film layer 24. The label printing layer is formed by screen printing using an ultraviolet curing ink.

In FIG. 1B, the recording layer 22 and the reflection layer 2 are illustrated as being flat, but corresponding to the concave / convex pattern formed on the optical recording portion 21 on the second surface 14. 3 are also formed along the irregularities, respectively, and it is assumed that the protective film layer 24 is formed in a state where the irregularities are buried.

The recording medium on which the optical recording section 21 as described above is formed is loaded into a disk drive, and a laser beam h is irradiated from the first surface 13 side. As a result, areas having different reflectivities (recording pits) are formed in the recording layer 22 and recording is performed. Then, the optical recording section 21 is reproduced using the fact that the reflectivity of the laser beam h reflected by the reflection layer 23 is different between the recorded pit and the unrecorded section.

The IC module 31 includes, for example, a ROM (Read Only Memory) i for holding data, a RAM (Random Access Memory) power, an IC chip, and an antenna coil pattern. Are mounted on a thin film.

The IC module 31 is housed and fixed in a concave portion 41 formed on the first surface 13 of the substrate 11, and the upper portion thereof is subjected to laminating processing by a transparent over sheet, and the IC module is processed. 3 1 is enclosed.

By enclosing the IC module 31 in this way, it is possible to process information on the recording medium in a non-contact state. Although the non-contact type IC module 31 is used in the present embodiment, a contact type may be used.

Here, the concave portion 41 in which the IC module 31 is sealed is formed outside the lead-out area 26 of the optical recording portion 21 in order to secure the data area of the optical recording portion 21 to the maximum. I have.

When the recess 41 is formed inside the lead-out area 26 of the optical recording section 21, the laser that enters the optical recording section 21 from the first surface 13 side by the enclosed IC module 31 Light h may be obstructed.

Also, the concave portion 41 is preferably formed on the first surface 13 of the substrate 11, and when formed on the second surface 14, the entire surface of the optical recording portion 21 is coated with the recording layer 22 and the like. In the step of forming, there is a possibility that the unevenness is caused by the concave portions 41 and the appearance is impaired. However, if there is no problem with the application state of the recording layer 22 on the second surface 14, the concave portion 41 may be formed on the second surface 14. In a recording medium in which the IC module 31 and the optical recording unit 21 having the above-described configuration are mounted on the same substrate 11, in particular, the recording medium of the present embodiment includes a center of gravity o of the entire recording medium, It is adjusted so that the rotation center d of the medium matches.

Here, as shown in FIG. 1B, when the recording medium is rotated around BB ′ as the rotation axis, the center of gravity o of the recording medium becomes the rotation center d of the recording medium d (indicated by an arrow in FIG. 1B). Line), the center of gravity o of the recording medium coincides with the rotation center d.

In the present embodiment, since the center c of the recording medium coincides with the center of rotation d, it is considered that the center of gravity o and the center of rotation d substantially coincide with each other when the IC module 31 is not mounted. Therefore, the volume of the concave portion 41 is adjusted so that the weight of the IC module 31 mounted on the recording medium is equal to the weight of the substrate 11 corresponding to the volume of the concave portion 41, or By adding a balance to 31, the bias of the center of gravity o due to the mounting of the IC module 31 can be eliminated, and the center of gravity o and the center of rotation d can be matched.

In this case, the position of the concave portion 41 only needs to be outside the lead-out area 26 of the optical recording portion 21 and there is no other limitation.

Next, a method for manufacturing the recording medium of the present invention will be described.

First, a stamper for the optical recording unit 21 that has been cut using a CD-R formatter is created.

Here, the present stamper is for forming a concavo-convex pattern formed on the substrate 11 such as a concave portion and a land portion of the optical recording portion 21 in a spiral shape. Here, time information is recorded by forming a wobble (meandering shape) in the group portion, but the start time of the door area 26 recorded in the lead-in area 25 is determined by the recording medium. De When the disc is loaded into the disk drive, make settings in consideration of the maximum recordable time so that the drive does not accidentally access the outside of the optical recording section 21.

Next, the substrate 11 is formed using a card-shaped mold.

On the side of the mold where the second surface 14 of the substrate 11 is formed, a stamper for forming a concavo-convex pattern of the optical recording section 21 is arranged. Also, on the side where the first surface 13 is formed, a concave portion 41 for enclosing the IC module and a convex portion for forming the hole 12 of the optical recording portion 21 are formed. Shall be.

The substrate 11 is molded into a card shape by injecting a resin such as a polycarbonate by an injection molding machine using a mold as described above.

The second surface 14 of the card-shaped substrate 11 molded in this way, that is, the surface on which the concave / convex pattern of the optical recording section 21 is formed, is a cyanine-based recording material serving as the recording layer 22. That is, a dye having a molecular structure represented by the following formula (1) (1-1 butyl- [5- (1-butyl-3,3-dimethylpentes [e] indrin-2-ylidene) -1, 3-pentagenenyl] -3 , 3-Dimethyl-1H-benz [e] indolinium) dissolved in an organic solvent to prepare a dye solution, and the solution was dropped at the center of the substrate surface with the guide groove, and then dried. And a film thickness of 100 nm was obtained. Here, a cyanine-based recording material was used as the recording material, but the recording material is not limited to this, and a phthalocyanine-based dye, an azo-based dye, or the like may be used.

Further, a reflection layer 23 having a thickness of 40 nm is formed on the recording layer 22 by using a silver alloy (AgPdO.9Cu1.0% by weight) using a sputtering apparatus. Here, a silver alloy is used as the material, but gold may be used. The RF magnetron sputtering method was used as sputtering conditions. The ultimate pressure was 4 × 10-3 (Pa), the sputter pressure was 0.76 (Pa), and the deposition power was 500 (W). The sputtering gas and atmosphere were Ar, and the gas flow rate was 20 (sc cm, standard cubic centimeters per minute). Then, a protective film layer 24 made of an ultraviolet curable resin containing an oligoester acrylate having a methacrylate group or an acrylate group is further formed on the reflection layer 23 by spinning all over, and a film thickness of 10 jm I got An optical recording section 21 (CD-R section) is formed. A label printing layer is formed on the protective film layer 24 by screen printing using an ultraviolet curable ink.

Next, the IC module 31 is housed and fixed in the concave portion 41 formed on the first surface 13 (the surface on which the laser light h is incident) of the substrate 11.

After that, the transparent oversheet is covered and press-laminated to obtain the recording medium of the present invention.

Then, optical information was reproduced at a linear velocity of 1.2 m / s and a laser power of 0.7 mW in a room temperature environment, and a reflectance of 72% was obtained.

With the recording medium having the above-described configuration, for example, information recorded in the IC module 31 can be confirmed in a non-contact state, and the optical recording unit 21 has a relatively large capacity. Information can be recorded in advance, and recording or reproduction can be performed.

Further, since the center of gravity o of the entire recording medium is adjusted to coincide with the rotation center d of the recording medium, the imbalance of the recording medium can be suppressed to, for example, 5 g · mm or less. For this reason, even when the recording medium is loaded in the disk drive and the recording medium is rotated at a high speed, the vibration during the rotation does not occur. As a result, the tracking support and the focus support of the optical pickup of the drive are stabilized, and the recording / reproducing operation can be performed reliably.

In addition, since the position of the center of gravity is adjusted by the recording medium itself, there is no need for a holder means corresponding to the recording medium, and a normal optical disk drive can be used. Absent. Further, in the present embodiment, since the center c of the recording medium coincides with the center of rotation d, the recording medium can be more reliably switched to the disk drive, and the recording or reproducing operation can be performed stably. Can be done.

Note that, in the present embodiment, an example in which the center c of the recording medium and the center of rotation d and the center of gravity o coincide with each other has been described. However, the present invention is not limited to this, and I just want to.

To make the position of the center of gravity o of the recording medium coincide with the rotation center d when the center c of the recording medium does not coincide with the rotation center d, for example, the weight of the IC module 31 and the IC module 3 The weight added by mounting the IC module 31 is calculated based on the weight of the substrate 11 corresponding to the volume of the concave portion 4 1 for enclosing the concave portion 4 1, and the concave portion 4 1 with respect to the rotation center d is obtained. Adjust the position. Alternatively, by fixing the position of the concave portion 41 and adjusting the position of the center of rotation d, that is, the position of the center of the hole 12 in the optical recording portion 21, the center of gravity o of the recording medium and the center of rotation d are adjusted. They may be matched. Further, similarly to the case where the center c of the recording medium and the center of rotation d coincide with each other, the center of gravity o of the recording medium may coincide with the center of rotation d by adjusting the volume of the concave portion 41.

(Second embodiment) FIG. 2A is a plan view of the recording medium in the present embodiment, and FIG. 2B is a cross-sectional view taken along the line CC ′ in FIG. 2A.

As shown in FIG. 2A, the recording medium of the present embodiment is provided with a balance 32 that serves as a weight for adjusting the center of gravity so that the center of gravity o and the center of rotation d of the recording medium match. Although different from the recording medium of the first embodiment, the other configuration is the same, and the description of the same configuration is omitted.

The balance 3 2 is mounted on the first surface 13 of the substrate 11 similarly to the IC module 31 in the first embodiment, and the balance 3 is mounted on the first surface 13 of the substrate 11. A recess 42 for enclosing 2 is formed.

Here, the concave portion 42 is formed outside the lead-out area 26 of the optical recording portion 21 similarly to the concave portion 41.

In the present embodiment, as shown in FIG. 2B, the concave portion 42 is formed at a position symmetrical to the concave portion 41 with respect to the rotation center d provided at the center c of the recording medium. For example, an IC module can be used as the balance 32 sealed in the recess 42.

By using the IC module, it can be used not only as a weight for adjusting the position of the center of gravity but also as an information recording unit.

As described above, when two IC modules are mounted on one recording medium, such as the balance 32 and the IC module 31, an IC module having the same weight is mounted on the rotation center d. By arranging them at symmetrical positions, it is possible to relatively easily adjust the center of gravity o of the entire recording medium to coincide with the rotation center d of the recording medium.

The IC module used as the balance 32 need not be used as an information recording unit, and may function as a weight for adjusting the position of the center of gravity の of the recording medium. Therefore, as balance 3 2, alloy weights etc. It may be used, and it is preferable to use a material such as stainless steel which has a large specific gravity and is hard to crack.

Further, in the present embodiment, the case where one balance 32 is arranged has been described, but a plurality of balances 32 are arranged around the rotation center d of the recording medium. Evenly arranged so as to surround the optical recording unit 21 And adjust the position of the center of gravity o.

In the method of manufacturing the recording medium of the present embodiment, a convex portion for forming a concave portion 42 for enclosing the balance 32 is formed on the side on which the first surface of the mold for molding the substrate 11 is formed. It can be manufactured in the same process as in the first embodiment except that a mold is used. Here, this convex portion is formed at a position symmetrical with respect to the convex portion for forming the concave portion 41 enclosing the IC module 31 with respect to the rotation center d.

In the recording medium of the present embodiment, the balance 32 for adjusting the position of the center of gravity is mounted to match the center of gravity o of the entire recording medium with the rotation center d of the recording medium. For example, it can be suppressed to 5 g · mm or less. Therefore, even when the recording medium is rotated at a high speed by being loaded in a disk drive, the vibration during rotation is suppressed, and the tracking servo and focus servo of the optical pickup of the drive are stabilized. Recording and playback operations can be performed reliably. In addition, by mounting the balance 32, the position of the center of gravity o can be adjusted by the weight of the balance 32 without adjusting the volume and position of the concave portion 41, so that the center of gravity of the recording medium can be adjusted. And the rotation center d can be more easily matched.

Further, by using an IC module as the balance 32, the number of IC chips to be mounted increases, so that the memory capacity increases. As described above, in the first embodiment and the second embodiment, the recording medium in which the optical recording unit 21 is irradiated with the laser light h from the first surface 13 side has been described. . However, the present invention is also applicable to a recording medium in which the laser beam h is irradiated to the optical recording section 21 from the protective film layer 24 side, and the same effect can be obtained.

In this case, the IC module 31 or the balance 32 sealed on the first surface 13 side does not hinder the laser beam h entering the optical recording unit 21. The positions of the recesses 41 and the recesses 42 may be inside the lead-out area 26 of the optical recording unit 21.

However, the recording layer 22 and the reflection layer 23 are formed in the reverse arrangement. The label printing layer is formed on the first surface 13 side of the substrate 11. Also, an example has been described in which a CD-R is formed as the optical recording section 21, but it is also possible to form a CD-ROM or CD-RW.

When a CD-RW is formed, for example, a first dielectric layer is formed on the second surface 14 side of the substrate 11 on which the concavo-convex pattern such as the group portion and the pit portion of the CD-RW is formed. zinc oxide silicon sulfide _{(Z n S- S i 0 2} ), silver-Injiumu antimony tellurium alloy phase is a change recording layer (Ag I n S bT e alloy), a second dielectric layer Z n S · S i O ₂ , and a silver alloy (AgPdCu) as a reflective layer are sequentially laminated. The film thicknesses are 85 nm, 30 nm, 30 nm and 40 nm. Further, a protective film layer made of an ultraviolet curable resin was formed by a spin coater, and a film thickness of 10 was obtained.

Thereafter, the optical recording portion 21 of the disk is irradiated with high-power laser light using an initialization device to initialize the AgInSbTe alloy phase change recording layer by changing its phase to a crystalline state. And get a CD-RW.

Further, in the first and second embodiments, the substrate 11 was formed using a card-shaped mold, but the center of gravity o of the entire recording medium and the recording were performed. If the rotation center d of the medium is aligned, the substrate 11 on which the concave portion 41 for enclosing the IC module 31 is formed is formed into a circular shape, and after the optical recording portion 21 is completed, It may be a method of cutting into a card shape with a single laser beam. In addition, the optical recording unit 21 is made as an optical disk separate from the substrate 11. It is later combined with the card-shaped substrate 11. <As described above, according to the recording medium of the present invention, since the center of gravity of the entire recording medium is aligned with the rotation center of the recording medium, when the recording medium is loaded on a disc drive However, unbalance due to rotation can be reduced. For this reason, even when the recording medium is loaded in a disk drive and the recording medium is rotated at high speed, the occurrence of vibration during rotation is suppressed, and it is possible to prevent a data error of the recording medium due to the vibration. Recording or playback operation can be performed stably.

Claims

The scope of the claims

1. In a recording medium in which a disc-shaped optical recording unit and an IC chip are mounted on the same substrate, and the optical recording unit rotates about the center of the optical recording unit, the center of gravity of the recording medium and the center of the recording medium A recording medium characterized by being aligned with the center of rotation.

2. The recording medium according to claim 1, wherein a center of the recording medium is aligned with a rotation center of the recording medium.

3. The recording medium according to claim 1, wherein said substrate is formed in a rectangular plate shape.

4. The recording medium according to claim 1, wherein a balance for adjusting a position of a center of gravity is mounted on the substrate.

5. The recording medium according to claim 4, wherein said balance is an IC chip.

6. The optical recording section on one main surface of the substrate, wherein a land section and a group section are formed in an uneven pattern, and the group section is formed in a meandering shape. recoding media.

7. The optical recording portion on one main surface of the substrate, wherein at least a recording layer, a reflective layer, a protective layer, and a label printing layer are sequentially laminated on the concave / convex pattern. The recording medium according to item 1.

8. The recording medium according to claim 7, wherein said recording layer is made of a cyanine-based material having a molecular structure represented by the following formula (1).