Optical disc

• US 8,081,541 B2
• Filed: 12/03/2008
• Issued: 12/20/2011
• Est. Priority Date: 06/30/2006
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Dokai, Yuya, Kato, Noboru, Kimura, Ikuhei
• Primary Examiner(s): Neyzari, Ali
• Application Number:
  US12/326,916
• Publication Number:
  US 20090080296A1
• Time in Patent Office: 1,112 Days
• Field of Search: 369/13.38, 369/13.35, 369/13.4, 369/13.41, 369/13.42, 369/13.23, 235/486, 235/435, 257/678
• US Class Current: 369/13.38
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/00094 involving measures which result in a restriction to authorised record carriers
• CPC Class Codes: G11B 20/00173 wherein the origin of the content is checked, e.g. determining whether the content has originally been retrieved from a legal disc copy or another trusted source
• CPC Class Codes: G11B 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/00253 wherein the key is stored on the record carrier
• CPC Class Codes: G11B 20/00275 the key being stored on a chip attached to the record carrier
• CPC Class Codes: G11B 20/00492 wherein content or user data is encrypted
• CPC Class Codes: G11B 20/00695 said measures preventing that data are read from the recording medium
• CPC Class Codes: G11B 20/00876 wherein physical copy protection means are attached to the medium, e.g. holograms, sensors, or additional semiconductor circuitry
• CPC Class Codes: G11B 2220/2537 Optical discs
• CPC Class Codes: G11B 23/286 Antitheft arrangements, e.g. Electronic Article Surveillance [EAS] tags
• CPC Class Codes: G11B 23/30 with provision for auxiliary signals
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation

Abstract

An optical disc includes an electromagnetic coupling module mounted therein. The electromagnetic coupling module includes a wireless IC chip and a feeder circuit substrate in which a feeder circuit including a resonant circuit having a predetermined resonant frequency is disposed. The electromagnetic coupling module is electromagnetically coupled to a reflective film defining a metal thin film of the optical disc, and the reflective film defines an antenna or radiation pattern of the electromagnetic coupling module.

Claims

1. An optical disc comprising:

an electromagnetic coupling module provided adjacent to a reflective film defining a metal thin film of the optical disc;

wherein

the electromagnetic coupling module includes a wireless IC chip and a feeder circuit substrate;

the feeder circuit substrate includes a feeder circuit including a matching circuit; and

the electromagnetic coupling module is electromagnetically coupled to the reflective film defining the metal thin film of the optical disc, and the reflective film defines an antenna or radiation pattern of the electromagnetic coupling module.

2. The optical disc according to claim 1, wherein the wireless IC chip is disposed on the feeder circuit substrate, and the reflective film faces a surface of the feeder circuit substrate on which the wireless IC chip is not disposed.

3. The optical disc according to claim 1, wherein the electromagnetic coupling module is disposed in a region of the optical disc other than a signal recordable region of the optical disc.

4. The optical disc according to claim 1, wherein the feeder circuit substrate includes a resonant circuit having a predetermined resonant frequency disposed therein;

and

the resonant circuit includes an inductance element defined by a linear electrode.

5. The optical disc according to claim 4, wherein the resonant circuit disposed in the feeder circuit substrate includes a plurality of resonant circuits.

6. The optical disc according to claim 1, wherein the optical disc is one of a digital versatile disc and a compact disc, a soft key for playback is set in a recording surface of the one of the digital versatile disc and the compact disc, and the soft key for playback is stored in the wireless IC chip.