Transparent data card

• US 20040046034A1
• Filed: 10/02/2003
• Published: 03/11/2004
• Est. Priority Date: 07/07/2000
• Status: Abandoned Application

• Current Assignee: Schlumberger Systemes
• Original Assignee: Schlumberger Systemes
• Inventors: Perben, Cedric, Ey Yamani, Hayat, Limelette, Yann
• Application Number:
  US10/332,182
• Publication Number:
  US 20040046034A1
• Time in Patent Office: Days
• US Class Current: 235/487
• CPC Class Codes: G06K 19/041 Constructional details G06K19/06 takes precedence
• CPC Class Codes: G06K 19/077 Constructional details, e.g. mounting of circuits in the carrier

Abstract

A data card comprises a data storage medium embedded in a card body. The card body comprises a filter layer (5) having substantially the same dimensions in terms of length and width as the card body. The filter layer is substantially transparent to electromagnetic radiation in a wavelength range that comprises electromagnetic radiation perceptible by the human whereas the filter layer is substantially opaque to electromagnetic radiation in another wavelength range.

Claims

1. A data card comprising a data storage medium embedded in a card body, characterized in that the card body comprises a filter layer (5) having substantially the same dimensions in terms of length and width as the card body, the filter layer being substantially transparent to electromagnetic radiation in a wavelength range that comprises electromagnetic radiation perceptible by the human eye, the filter layer being substantially opaque to electromagnetic radiation in another wavelength range.

2. A data card according to claim 1, characterized in that filter layer (5) is substantially opaque to electromagnetic radiation in a wavelength range associated with infrared radiation.

3. A data card according to claim 2, characterized in that the filter layer (5) comprises a silver-based sub-layers (6) that is sandwiched between two antireflection sub-layer (7).

4. A card according to claim 3, characterized in that the antireflection sub-layer (7) is made from titanium oxide.

5. A card according to claim 4, characterized in that the filter layer (5) has a thickness comprised in the range between 150 nm and 250 nm.

6. A card according to claim 3, characterized in that said the silver-based sub-layer (6) has a thickness of comprised in a range between 5 and 15 nm.