Method of integrating an identification circuit into a data medium

• US 8,502,677 B2
• Filed: 06/13/2007
• Issued: 08/06/2013
• Est. Priority Date: 06/28/2006
• Status: Expired due to Fees

• Current Assignee: InterDigital Madison Patent Holdings (InterDigital, Inc.)
• Original Assignee: Thomson Licensing (Vantiva SA)
• Inventors: Pintos, Jean-Francois, Minard, Philippe, Louzir, Ali
• Primary Examiner(s): Mehmood, Jennifer
• Assistant Examiner(s): BEE, ANDREW W.
• Application Number:
  US12/308,724
• Publication Number:
  US 20100045438A1
• Time in Patent Office: 2,246 Days
• Field of Search: 340/572.1, 340/572.5, 340/572.7, 343/767, 343/769, 343/770
• US Class Current: 340/572.7
• 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 having a part receiving data and a part without data, the method comprising the steps of:

etching in the part without data of the conductive layer on a first length L less than a perimeter of said part without data, at least a radiating slot forming an antenna, said first length L determining a resonating frequency, and

coupling an integrated circuit to the radiating slot and positioning said integrated circuit on said radiating slot, at a second length L′

from an end of said first length L, said second length L′

being selected to optimize an impedance of the radiating slot.

2. Method according to claim 1, wherein the first length L is such that L=λ

g/2 where λ

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

3. Method according to claim 1, wherein at least two 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 two 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 radiating slot.

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

7. 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.

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

9. A data medium formed by at least one dielectric substrate covered by a conductive layer, the conductive layer having a part receiving data and a part without data;

wherein the part without data of the conductive layer comprises etching on a first length L less than a perimeter of said part without data, at least a radiating slot forming an antenna, said first length L determining a resonating frequency; and

an integrated circuit coupled to said radiating slot and positioned on said radiating slot at a second length L′

from an end of said first length L, said second length L′

being selected to optimize an impedance of the radiating slot.