Method of integrating an identification circuit into a data medium

• US 20100045438A1
• Filed: 06/13/2007
• Published: 02/25/2010
• Est. Priority Date: 06/28/2006
• Status: Active Grant

• Current Assignee: InterDigital Madison Patent Holdings (InterDigital, Inc.)
• Original Assignee: Thomson Licensing (Vantiva SA)
• Inventors: Minard, Philippe, Louzir, Ali, Pintos, Jean-Francois
• Granted Patent: US 8,502,677 B2
• Time in Patent Office: Days
• US Class Current: 340/10.100
• CPC Class Codes: G06K 19/045 the record carrier being of the non-contact type, e.g. RFID, and being specially adapted for attachment to a disc, e.g. a CD or DVD
• CPC Class Codes: G06K 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
• CPC Class Codes: G11B 23/0042 with provision for auxiliary features sensing such features G11B17/00, G11B19/02
• CPC Class Codes: H01Q 1/2208 associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems methods or arrangements for sensing record carriers, e.g. for reading patterns G06K7/00; record carrier for use with machines and with at least a part designed to carry digital markings G06K19/00
• CPC Class Codes: H01Q 13/10 Resonant slot antennas

Abstract

The present invention relates to a method for integrating an identifier circuit in a data medium formed by at least one dielectric substrate covered by a conductive layer, the conductive layer comprising a part receiving data and a part without data. The method consists in etching in the part without data of the conductive layer, at least one resonating slot forming an antenna and coupling an integrated circuit to the slot.

Claims

1. Method for integrating an identification circuit in a data medium formed by at least one dielectric substrate covered by a conductive layer, the conductive layer comprising a part receiving data and a part without data consisting in:

etching in the part without data of the conductive layer, at least a radiating slot forming an antenna, and

coupling an integrated circuit to the slot.

2. Method according to claim 1, wherein the conductive layer is etched on a length L such that L=λ

g/2 where λ

g is equal to the wavelength in the slot at the resonating frequency.

3. Method according to claim 1, wherein at least 2 concentric resonating slots electromagnetically coupled together are etched in the part without data of the conductive layer.

4. Method according to claim 1, wherein at least 2 partially overlying resonating slots are etched in the part without data of the conductive layer.

5. Method according to claim 1, wherein the integrated circuit is electromagnetically coupled to the resonating slot.

6. Method according to claim 1, wherein the integrated circuit is connected directly to the resonating slot.

7. Method according to claim 1, wherein the integrated circuit is positioned on the resonating slot at a length L′

with respect to one end of the resonating slot optimising the impedance of the resonating slot.

8. Method according to claim 1, wherein the data medium is a disk such as a compact disk (CD), a digital versatile disk (DVD), or a mini-disk.

9. Method according to claim 1, wherein the integrated circuit is a RFID circuit or a RF circuit.

10. Data medium formed by at least a dielectric substrate covered by a conductive layer, the conductive layer comprising a part receiving data a part without data said medium further comprising:

an antenna formed by a radiating slot etched in the part without data of the conductive layer and,

an identification circuit formed by a chip coupled to the slot.