JPH09245381A - Optical disk - Google Patents

Optical disk

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Publication number
JPH09245381A
JPH09245381A JP8073205A JP7320596A JPH09245381A JP H09245381 A JPH09245381 A JP H09245381A JP 8073205 A JP8073205 A JP 8073205A JP 7320596 A JP7320596 A JP 7320596A JP H09245381 A JPH09245381 A JP H09245381A
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Japan
Prior art keywords
disk
circuit
data
disc
memory
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JP8073205A
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Japanese (ja)
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JP3882218B2 (en
Inventor
Takao Hiramoto
Tadashi Osue
Yoshihisa Takayama
匡 尾末
隆夫 平本
佳久 高山
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Sony Corp
ソニー株式会社
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Application filed by Sony Corp, ソニー株式会社 filed Critical Sony Corp
Priority to JP07320596A priority Critical patent/JP3882218B2/en
Publication of JPH09245381A publication Critical patent/JPH09245381A/en
Application granted granted Critical
Publication of JP3882218B2 publication Critical patent/JP3882218B2/en
Anticipated expiration legal-status Critical
Application status is Expired - Fee Related legal-status Critical

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Abstract

PROBLEM TO BE SOLVED: To make possible storing information of a disk in the disk without losing the compatibility of the disk.
SOLUTION: An optical disk 1 is formed by sticking the disk 1A to the disk 1B each other. A circuit part 6 consisting of a CPU, a memory, a transmission and reception circuit and a power source circuit, and a coil part 7 led out from the circuit part are buried between the disk 1A and the disk 1B. Then, the data are inputted/outputted without contacting between with the outside by connection of the coil part. Since the circuit part 6 and the coil part 7 are buried in the disk, the external size of the disk isn't changed, and the compatibility is secured. Further, since the input/output of the data between with the outside are performed without contacting, the reliability is improved.
COPYRIGHT: (C)1997,JPO

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】この発明は、ディスクの内容や履歴等を記録できる光ディスクに関するもので、特に、DVDに用いて好適な光ディスクに関わる。 BACKGROUND OF THE INVENTION This invention relates to an optical disc capable of recording the content of the disk and history, etc., in particular, relating to a preferred optical disk with a DVD.

【0002】 [0002]

【従来の技術】波長の短いレーザ光を使用すると共に対物レンズの開口数を大きくすることにより、現行のコンパクトディスクの数倍の約8〜10Gバイトの記録容量を有するようにした光ディスク(DVDと称される)が開発されている。 By increasing the numerical aperture of the objective lens together with the Related Art using short laser beam wavelength, and an optical disk (DVD to have a recording capacity of several times about 8~10G byte of the current compact disc referred to) has been developed. このようなDVDには、例えば、MP Such DVD, for example, MP
EG2により圧縮されたディジタルビデオ信号を記録して、動画再生用として用いるばかりでなく、大容量のディジタルデータ記録する記録媒体として用いることが期待されている。 EG2 record the digital video signal compressed by not only used for the video playback, are expected to be used as a recording medium for digital data recording large capacity.

【0003】DVDのような大容量の記録媒体では、記録されるデータ量も膨大になることから、データの管理が困難になる。 [0003] In large-capacity recording medium such as a DVD, since the amount of data to be recorded becomes enormous, the management of data becomes difficult. また、DVDには、ディジタルビデオ信号が記録されることから、記録番組の内容、記録年月日、記録回数等の履歴の管理、プロテクトの有無等のI Further, in the DVD, since the digital video signal is recorded, the contents of the recorded program, recording date, management of the history of such recording frequency, such as the presence or absence of protection I
D情報の管理等が必要になってくる。 Management of D information becomes necessary. そこで、ディスクに関する情報を記憶するメモリを設け、このメモリにディスクのファイルや番組の内容、記録年月日、履歴、I Therefore, a memory for storing information about the disk provided, the contents of the disk files and programs in the memory, recording date, history, I
D等を記録することが考えられる。 It is conceivable to record the D or the like.

【0004】このように、ディスクに関する情報を記憶するメモリを設ける場合、ディスクが収納されるディスクカートリッジ内に、ディスクの情報を記録したメモリを設けることが考えられる。 [0004] Thus, in the case of providing a memory for storing information about the disk, in the disk cartridge disk is housed, it is conceivable to provide a memory which records the information of the disc. この場合、ディスクがプレーヤ本体内に装着されると、コネクタを介して、ディスクカートリッジ内のメモリとプレーヤ本体内のコントローラとの間が接続される。 In this case, when the disc is loaded into the player body, through the connector, between the memory and the controller in the player body in the disk cartridge is connected. ディスクカートリッジ内のメモリから、ファイルや番組の内容、記録年月日、履歴、 From memory in the disk cartridge, the contents of a file or program, recording date, history,
ID等、ディスクに関する情報が読み出され、これにより、ディスクが管理される。 ID, etc., information on the disc is read out, thereby, the disk is managed.

【0005】 [0005]

【発明が解決しようとする課題】ところが、DVDでは、現行のコンパクトディスクとの互換性を図るために、ディスクとディスクカートリッジとが一体化された構造とされていない。 The object of the invention is to be Solved However, in the DVD, in order to achieve compatibility with existing compact disc, not the disk and the disk cartridge and is integrated structure. このため、上述のように、ディスクカートリッジ内にメモリを設けるような構成とすることはできない。 Therefore, as described above, it can not be configured as providing memory in the disk cartridge.

【0006】そこで、ディスクカートリッジを有していない光ディスクの場合にも対処できるように、ディスクの情報が格納されるメモリをディスク内に取り付けることが考えられる。 [0006] Therefore, to handle in the case of an optical disc having no disk cartridge, it is conceivable to mount a memory in which information of the disk is stored in the disk. ところが、この場合、ディスクは回転しているため、ディスクに取り付けられたメモリとプレーヤ本体内のコントローラとをコネクタで接続することができない。 However, in this case, the disk since the rotating, it is not possible to connect the controller in the memory and the player body attached to the disc by the connector. ディスク内のメモリ側から導出された信号線をディスクの円周上に沿って環状に配設し、この環状の信号線上にブラシを摺動させる構造とすることが考えられるが、このようにな構造では、信頼性に問題がある。 A signal line derived from the memory side of the disk along the circumference of the disk is disposed in an annular, it is considered to have a structure for sliding the brush on the annular signal line, it thus in the structure, there is a problem with reliability.

【0007】そこで、例えば、ディスク内のメモリと、 [0007] Thus, for example, and the memory of the disk,
プレーヤ本体内のコントローラとを、電磁波で結ぶことが考えられる。 A controller within the player body, it is conceivable to connect an electromagnetic wave. ところが、ディスク内にこのような機能をもたせたために、ディスクの厚みやディスクの形状が従来のディスクと変わってしまうと、互換性に問題が生じている。 However, in order to remembering such a function in the disc, the shape of the disc thickness and disc would change the conventional disk, compatibility problems have occurred.

【0008】したがって、この発明の目的は、ディスクの互換性が失われずに、ディスクの情報をディスク内に格納することができる光ディスクを提供することにある。 It is therefore an object of this invention is not lost compatible disk, is to provide an optical disc that can store information in disk in the disk.

【0009】 [0009]

【課題を解決するための手段】この発明は、第1の信号記録面と第2の信号記録面とを有し、第1の信号記録面と第2の信号記録面とを貼り合わせるようにした光ディスクにおいて、第1の信号記録面と第2の信号記録面との間に、ディスクに関わる情報が記録されるメモリと、 SUMMARY OF THE INVENTION The present invention has a first signal recording surface and a second signal recording surface, to attach the first signal recording surface and the second signal recording surface in an optical disk, between the first signal recording surface and the second signal recording surface, and a memory in which information relating to the disc is recorded,
メモリに対して非接触で情報の入出力を行う入出力部とを配設するようにしたことを特徴とする光ディスクである。 That the optical disc is characterized in that so as to arrange the input and output unit for performing input and output of information in non-contact with the memory.

【0010】光ディスクの内部に、CPU、メモリ、送受信回路、電源回路からなる回路部と、回路部から導出されたコイル部とが埋め込まれる。 [0010] inside of the optical disk, CPU, memory, transceiver circuits, a circuit section composed of the power supply circuit, and a coil portion which is derived from the circuit unit is embedded. そして、コイル部の結合により、外部との間で、非接触でデータの入出力を行うことができる。 By coupling the coil portion can be between the external input and output data without contact. 回路部及びコイル部がディスク内に埋め込まれているので、ディスクの外形は変化せず、互換性が保てる。 Since the circuit portion and the coil portion is embedded in the disk, the outer shape of the disk does not change, maintain compatibility. また、外部との間のデータの入出力を非接触で行なえるので、信頼性が向上される。 Further, since the performed input and output of data between the external in a non-contact, reliability is improved.

【0011】 [0011]

【発明の実施の形態】以下、この発明の実施の形態について図面を参照して説明する。 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, will be explained with reference to the drawings showing preferred embodiments of the present invention. 図1において、1は光ディスクである。 In Figure 1, 1 is an optical disk. 光ディスク1は、直径120mm、厚さ1.2mmで、現行のコンパクトディスクと外形状の互換性を保ち、波長の短いレーザ光を使用すると共に対物レンズの開口数を大きくすることにより、現行のコンパクトディスクの数倍の約8〜10Gバイトの記録容量を有するようにした光ディスク(DVD)である。 Optical disc 1 has a diameter of 120 mm, a thickness of 1.2 mm, maintaining compatibility with existing compact disc and the outer shape, by increasing the numerical aperture of the objective lens with using short laser beam wavelength, the current compact is an optical disk which is to have a recording capacity of several times about 8~10G byte disk (DVD). 光ディスク1の中心部には、孔10が形成される。 At the center of the optical disc 1, holes 10 are formed. 光ディスク1がプレーヤに装着されると、光ディスク1は、孔10 When the optical disc 1 is mounted on the player, the optical disc 1, holes 10
を中心に回転される。 It is rotated about the.

【0012】光ディスク1は、図2に示すように、2枚のディスク1A、1Bを貼り合わせた構造とされている。 [0012] the optical disc 1, as shown in FIG. 2, two disks 1A, there is a combined structure attached to 1B. すなわち、図2は、光ディスク1の断面構造を示すものである。 That is, FIG. 2 shows a cross-sectional structure of the optical disc 1. 厚さ0.6mmの基板2Aに、例えばアルミニュームの第1の反射膜3Aが積層され、これに保護膜4Aが積層され、ディスク1Aが形成される。 The substrate 2A having a thickness of 0.6 mm, for example, the first reflection film 3A of aluminum is laminated, protective film 4A is laminated thereto, the disc 1A is formed. また、 Also,
厚さ0.6mmの基板2Bに、例えばアルミニュームの第2の反射膜3Bが積層され、これに保護膜4Bが積層され、光ディスク1Bが形成される。 The substrate 2B thickness 0.6 mm, for example, a second reflection film 3B of aluminum is laminated to the protective layer. 4B which are stacked, the optical disc 1B is formed. これら2枚のディスク1AとディスクBへとが、接着層5を介して貼り合わされる。 To these two disks 1A and disk B but is bonded via an adhesive layer 5.

【0013】図1において、光ディスク1のエリアA1 [0013] In FIG. 1, the optical disc 1 area A1
にデータが記録される。 Data is recorded on. そして、データ記録エリアA1 Then, the data recording area A1
の内周側の、データ記録に用いられないエリアA2に、 Inner circumferential side, in the area A2 which is not used for data recording,
ディスクの情報を記憶させるための回路部6と、回路部6から導出されたコイル部7とが配設される。 A circuit portion 6 for storing the information of the disc, and the coil part 7, which is derived from the circuit portion 6 is disposed. コイル部7は、光ディスク1と同一の中心軸となるように埋設される。 Coil unit 7 is embedded so that the same center axis and the optical disk 1.

【0014】前述したように、光ディスク1は、2枚のディスク1A及び1Bを貼り合わせた構成とされており、回路部6及びコイル部7は、この2枚のディスク1 [0014] As described above, the optical disc 1 is configured by bonding two disks 1A and 1B, the circuit portion 6 and the coil unit 7, the two discs 1
AとディスクBとの間に配置される。 It is disposed between the A and the disc B. すなわち、図3に示すように、ディスク1Aの回路部6及びコイル部7が配置される部分には、凹部8Aが形成され、同様に、光ディスク1Bの回路部6及びコイル部7が配置される部分には、凹部8Bが形成される。 That is, as shown in FIG. 3, in the portion where the circuit portion 6 and the coil portion 7 of the disc 1A is arranged, the recess 8A is formed, similarly, the circuit portion 6 and the coil portion 7 of the optical disc 1B is located in part, the recess 8B are formed. ディスク1A及び1B Disc 1A and 1B
を貼り合わせたときに、凹部8Aと凹部8Bとの間に形成される間隙に、回路部6及びコイル部7が配置される。 When bonding the, the gap formed between the recess 8A and the recess 8B, are disposed circuit 6 and the coil 7. このように、回路部6及びコイル部7は、2枚のディスク1A及び1Bとの間に埋め込まれているため、回路部6及びコイル部7を配置しても、ディスクの物理的な形状は変わらない。 Thus, the circuit portion 6 and the coil unit 7, since they are embedded between the two disks 1A and 1B, be arranged circuit portion 6 and the coil 7, the physical shape of the disc does not change.

【0015】図4は、回路部6の構成を示すものである。 [0015] Figure 4 shows a configuration of a circuit portion 6. 図4において、メモリ12に、ファイルや番組の内容、記録年月日、履歴、ID等が記憶される。 4, the memory 12, the contents of a file or a program, recording date, history, ID and the like are stored. このメモリ12に対するデータの読出し/書込みは、CPU11 Read / write of data to the memory 12, CPU 11
により制御される。 It is controlled by. 外部とのデータの入出力は、コイル部7及び送受信回路13により、電磁波により非接触で行われる。 Input and output of data with the outside, by the coil portion 7 and the receiving circuit 13 is carried out in a non-contact manner by electromagnetic wave. また、外部から与えられる搬送波を平滑して、電源が形成される。 Further, by smoothing the carrier externally applied power supply is formed. 形成された電源は、電源回路1 Formed power, the power supply circuit 1
4から、CPU11、メモリ12、送受信回路13に供給される。 From 4, CPU 11, memory 12, is supplied to the transceiver circuit 13.

【0016】図5は、光ディスク1内の回路部6との間で、データの授受を行うための外部回路の構成を示すものである。 [0016] Figure 5, between the circuit portion 6 in the optical disc 1 showing the configuration of an external circuit for exchanging data. 図5において、CPU21に対して、メモリ22と、キーボード23と、送受信回路24が設けられる。 5, with respect to CPU 21, a memory 22, a keyboard 23, transceiver circuit 24 is provided. 送受信回路24からは、コイル部25が導出される。 From reception circuit 24, the coil portion 25 are derived. データの入出力は、コイル部25及び送受信回路1 Input and output data, the coil unit 25 and the transceiver circuit 1
4により行われる。 It is carried out by 4. 送受信回路14に対して、電源回路26が設けられている。 Against transceiver circuit 14, the power supply circuit 26 is provided.

【0017】図4に示した光ディスク1内の回路部6 The circuit portion 6 in the optical disc 1 shown in FIG. 4
と、図5に示した外部の回路との間のデータの入出力は、図6に示すようにして行われる。 When input and output of data between the external of the circuit shown in FIG. 5 is performed as shown in FIG. 図6に示すように、光ディスク1のコイル部7と外部の回路のコイル部25とは、対向して配置される。 As shown in FIG. 6, the coil portion 25 of the coil portion 7 and the external circuit of the optical disc 1, it is arranged opposite. 前述したように、光ディスク1のコイル部7は、光ディスク1の回転軸と同じ回転軸上に配設されている。 As described above, the coil portion 7 of the optical disk 1 is arranged on the same rotation axis on the axis of rotation the optical disc 1. 外部のコイル部25も、光ディスク1の回転軸と同じ回転軸上に配置される。 External coil unit 25 are also disposed on the same rotation axis on the optical disc 1 rotating shaft. このように、コイル部7とコイル部25とを対向して配置すると、コイル部7とコイル部25とは結合する。 Thus, when disposed opposite the coil portion 7 and the coil unit 25, coupled to the coil portion 7 and the coil unit 25.

【0018】外部の回路から光ディスク1内の回路部6 [0018] The circuit from the outside of the circuit in the optical disc 1 part 6
にデータを送る場合には、CPU21からのデータが送受信回路24に送られる。 When sending the data, the data from the CPU21 is transmitted to the reception circuit 24. 送受信回路24でデータが変調される。 Data is modulated by the transmission and reception circuit 24. この変調されたデータは、コイル部25に供給される。 The modulated data is supplied to the coil unit 25. コイル部25とコイル部7とは結合されているため、このコイル部25の出力は、コイル部7に伝達され、コイル部7の出力が送受信回路13に供給される。 Because it is coupled to the coil portion 25 and the coil unit 7, the output of the coil portion 25 is transmitted to the coil 7, the output of the coil unit 7 is supplied to the transceiver circuit 13. 送受信回路13で、このデータが復調されると共に、送られてきたデータの搬送波が整流され、電源が形成される。 Receive circuit 13, together with the data is demodulated, the carrier of the data sent is rectified, the power is formed. この電源は、CPU11、メモリ12、送受信回路13に供給される。 The power supply, CPU 11, memory 12, is supplied to the transceiver circuit 13. 送受信回路13で復調されたデータは、CPU11の制御の基に、メモリ12に記憶される。 Data demodulated by the transmission and reception circuit 13 under the control of the CPU 11, is stored in the memory 12.

【0019】光ディスク1内の回路部6から外部の回路にデータを出力する場合には、CPU11の制御の基に、メモリ12からのデータが読み出される。 [0019] When outputting the data from the circuit portion 6 in the optical disc 1 to the outside of the circuit, under the control of the CPU 11, the data from the memory 12 is read out. このデータは、送受信回路13に供給される。 This data is supplied to the transceiver circuit 13. 送受信回路13 Transmission and reception circuit 13
で、このデータが変調される。 In, this data is modulated. 送受信回路13の出力がコイル部7に供給される。 The output of the transceiver circuit 13 is supplied to the coil unit 7. コイル部7とコイル部25とは結合されているため、このコイル部7の出力は、コイル部25に伝達され、コイル部25の出力が送受信回路24に供給される。 Because it is coupled to the coil portion 7 and the coil unit 25, the output of the coil portion 7 is transmitted to the coil 25, the output of the coil portion 25 is supplied to the transceiver circuit 24. 送受信回路24で、送られてきたデータが復調される。 Receive circuit 24, data transmitted is demodulated. 復調されたデータは、送受信回路2 The demodulated data, transmitting and receiving circuit 2
4からCPU21に送られる。 4 is sent to the CPU 21.

【0020】このように、この発明が適用された光ディスクでは、光ディスク1の内部に、CPU11、メモリ12、送受信回路13、電源回路14からなる回路部6 [0020] Thus, in the optical disc to which the invention is applied, the inside of the optical disc 1, CPU 11, memory 12, transceiver circuit 13, the circuit portion 6 consisting of a power supply circuit 14
と、コイル部7とが埋め込まれる。 When, embedded a coil portion 7. そして、外部の回路との間で、非接触でデータの入出力を行うことができる。 Then, it is possible with an external circuit, to input and output data without contact. 回路部6及びコイル部7が光ディスク1内に埋め込まれているので、ディスクの外形は変化せず、互換性が保てる。 Since the circuit section 6 and a coil part 7 is embedded in the optical disc 1, the outer shape of the disk does not change, maintain compatibility. また、外部との間のデータの入出力を非接触で行なえるので、信頼性が向上される。 Further, since the performed input and output of data between the external in a non-contact, reliability is improved.

【0021】なお、上述の例では、ディスクの内周側のエリアA2に回路部6とコイル部7とを配設しているが、ディスクの外周側のエリアA3に回路部6及びコイル部7を配設するようにしても良い。 [0021] In the above example, although disposed a circuit portion 6 and the coil portion 7 in the area A2 of the inner peripheral side of the disc, the circuit portion 6 and the coil portion 7 in the area A3 of the outer peripheral side of the disc it may be disposed.

【0022】 [0022]

【発明の効果】この発明によれば、光ディスクが2枚のディスクを貼り合わせて形成され、この2枚のディスクの間に、CPU、メモリ、送受信回路、電源回路からなる回路部と、回路部から導出されたコイル部とが埋め込まれる。 Effects of the Invention According to the present invention, an optical disc is formed by bonding two discs, between the two discs, and a circuit portion comprising a CPU, a memory, sending and receiving circuit, from the power supply circuit, the circuit section a coil portion that is derived from is embedded. 回路部及びコイル部がディスク内に埋め込まれているので、ディスクの外形は変化せず、互換性が保てる。 Since the circuit portion and the coil portion is embedded in the disk, the outer shape of the disk does not change, maintain compatibility. また、光ディスクに埋め込まれたコイル部と外部の回路のコイル部とが対向して配置され、結合される。 Further, a coil portion of the coil portion and the outside of the circuit embedded in the optical disk is disposed opposite and coupled. このため、光ディスクの内部の回路部と、外部の回路部との間で、非接触でデータの入出力を行うことができる。 Therefore, the circuit portion of the interior of the optical disc, can be with an external circuit, to input and output data without contact.
そして、光ディスクに埋め込まれたコイル部は、その回転軸がディスクの回転軸と同一であるため、ディスクが回転している間でも、外部の回路のコイル部との間の結合状態が安定に保たれる。 The coil portion embedded in the optical disk, therefore the rotation axis is identical to the rotation axis of the disk, even while the disk is rotating, coupling state stably holding between the coil portion of the external circuitry dripping.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】この発明が適用された光ディスクの説明に用いる平面図である。 1 is a plan view used for explaining the optical disc to which the invention is applied.

【図2】この発明が適用された光ディスクの説明に用いる断面図である。 2 is a sectional view used for explaining the optical disc to which the invention is applied.

【図3】この発明が適用された光ディスクの説明に用いる断面図である。 3 is a sectional view used for explaining the optical disc to which the invention is applied.

【図4】この発明が適用された光ディスクの説明に用いるブロック図である。 4 is a block diagram for use in explanation of an optical disc to which the invention is applied.

【図5】この発明が適用された光ディスクの説明に用いるブロック図である。 5 is a block diagram for use in explanation of an optical disc to which the invention is applied.

【図6】この発明が適用された光ディスクの説明に用いるブロック図である。 6 is a block diagram for use in explanation of an optical disc to which the invention is applied.

【符号の説明】 DESCRIPTION OF SYMBOLS

1・・・光ディスク,1A,1B・・・ディスク,6・ 1 ... optical disk, 1A, 1B ... disc, 6-
・・回路部,7・・・コイル部 ... circuit section, 7 ... coil portion

Claims (2)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 第1の信号記録面と第2の信号記録面とを有し、上記第1の信号記録面と上記第2の信号記録面とを貼り合わせるようにした光ディスクにおいて、 上記第1の信号記録面と上記第2の信号記録面との間に、上記ディスクに関わる情報が記録されたメモリと、 1. A and a first signal recording surface and the second signal recording surface, the optical disk so as to bond the said first signal recording surface and the second signal recording surface, said first between the first signal recording surface and the second signal recording surface, and a memory in which information relating to the disc is recorded,
    上記メモリに対して非接触で情報の入出力を行う入出力部とを配設するようにしたことを特徴とする光ディスク。 Optical disc is characterized in that so as to arrange the input and output unit for performing input and output of information in non-contact with the memory.
  2. 【請求項2】 上記入出力部は、上記ディスクの中心軸と同一の中心軸を有するコイルで形成されるようにした請求項1記載の光ディスク。 Wherein said input-output unit, an optical disk according to claim 1, wherein the to be formed by a coil having the same central axis and the central axis of the disc.
JP07320596A 1996-03-04 1996-03-04 optical disk Expired - Fee Related JP3882218B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP07320596A JP3882218B2 (en) 1996-03-04 1996-03-04 optical disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP07320596A JP3882218B2 (en) 1996-03-04 1996-03-04 optical disk

Publications (2)

Publication Number Publication Date
JPH09245381A true JPH09245381A (en) 1997-09-19
JP3882218B2 JP3882218B2 (en) 2007-02-14

Family

ID=13511427

Family Applications (1)

Application Number Title Priority Date Filing Date
JP07320596A Expired - Fee Related JP3882218B2 (en) 1996-03-04 1996-03-04 optical disk

Country Status (1)

Country Link
JP (1) JP3882218B2 (en)

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