Claims
- 1. Anti-counterfeit security device for documents in general, comprising a tape like supporting element supporting:
- a first security element constituted by regions that are made of a material which can be statically detected by magnetoresistors, said regions being arranged in succession and being formed by ink containing iron dust, said regions comprising at least one first region made of said ink which contains a first percentage of iron dust and at least one second region made of said ink which contains a second percentage of iron dust which differs from said first percentage, thereby to generate a coded signal that can be statically detected by said magnetoresistors; and
- a second security element, visually detectable in transmitted light, which is constituted by portions of at least some of said regions which are free from said ink in order to form graphic markings that can be perceived optically in transmitted light.
- 2. Security device according to claim 1, comprising an additional security element constituted by regions made of magnetic material that form a read code, said regions made of magnetic material being located in different points with respect to said regions that are free from said ink.
- 3. Security device according to claim 1, wherein said ink forms regions that have a different response to reading by means of said magnetoresistors by varying a thickness of said region.
Priority Claims (1)
Number |
Date |
Country |
Kind |
MI93A0251 |
Feb 1993 |
ITX |
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Parent Case Info
This is a continuation application of application Ser. No. 08/194,975 filed on Feb. 14, 1994, now abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (7)
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0057520 |
Aug 1982 |
EPX |
0094775 |
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EPX |
0310707 |
Apr 1989 |
EPX |
0185396 |
Jun 1989 |
EPX |
0330733 |
Sep 1989 |
EPX |
9208226 |
May 1992 |
WOX |
9211142 |
Jul 1992 |
WOX |
Continuations (1)
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Number |
Date |
Country |
Parent |
194975 |
Feb 1994 |
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