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Internal drum communication using a capacitor

  • US 6,158,857 A
  • Filed: 04/29/1999
  • Issued: 12/12/2000
  • Est. Priority Date: 04/29/1999
  • Status: Expired due to Term
First Claim
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1. A printer for printing onto a print media, comprising:

  • a rotating drum platen for holding a print medium on an outer surface thereof, the drum platen having an interior volume defined therein and an end wall extending transversely to the outer surface;

    apparatus for rotating the drum to move the print medium during printing operations;

    a printer controller mounted in a fixed position relative to a printer chassis;

    an electronic circuit disposed in said interior volume of said drum platen; and

    a data communication link for passing data between the printer controller and the electronic circuit, the link comprising a capacitor comprising a first capacitive structure mounted to the end wall of the drum platen, and a second capacitive structure mounted in fixed relation to the drum platen adjacent the end surface and in close proximity to the first capacitive structure, wherein data is passed through said capacitor.

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