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Bar code, as well as process and apparatus for reading the same

  • US 5,430,278 A
  • Filed: 11/16/1992
  • Issued: 07/04/1995
  • Est. Priority Date: 09/23/1989
  • Status: Expired due to Fees
First Claim
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1. Process for reading a bar code including diamagnetic or paramagnetic bars and gaps therebetween, said diamagnetic or paramagnetic bars having different electrical conductivities, the process comprising the steps of:

  • bringing the bar code under a combined generating and reading head,generating an electromagnetic A.C. field by the bar code, said electromagnetic A.C. field generating a rotational field in the electrically, conducting bars of the bar code, anddetecting at the same time the generated rotational field as a measuring field altered by the bar code, thereby enabling the bar code to be read by said combined generating and reading head,whereby said bar code having different electrical conductivities is brought under said combined generating and reading head and said electromagnetic A.C. field is generated by the bar code and generates said rotational field in the electrically conducting bars of the bar code and the generated rotational field is simultaneously detected as the measuring field altered by the bar code so as to enable the bar code to be read by said combined generating and reading head.

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