×

Non-contact information storage medium and data transmission method for the medium

  • US 6,079,622 A
  • Filed: 10/24/1997
  • Issued: 06/27/2000
  • Est. Priority Date: 10/24/1996
  • Status: Expired due to Term
First Claim
Patent Images

1. A non-contact information storage medium for receiving power from a received radio wave from outside of the medium, and transmitting data in a form of a transmission wave to the outside, comprising:

  • an antenna for obtaining power from a received radio wave;

    a rectifier circuit for converting the power obtained by the antenna into a power current for powering a circuit incorporated in the medium;

    a switching circuit connected to an output of the rectifier circuit for switching on and off a current path from the rectifier circuit in accordance with the transmission wave;

    a smoothing capacitor connected to the output of the rectifier circuit through the switching circuit for accumulating the output current of the rectifier circuit and smoothing an output voltage; and

    a voltage stabilizing circuit connected to the smoothing capacitor for keeping at a constant value a charge voltage of the smoothing capacitor.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×