RFID material tracking method and apparatus

• US 20020196145A1
• Filed: 08/28/2002
• Published: 12/26/2002
• Est. Priority Date: 08/09/1999
• Status: Active Grant

• Current Assignee: Round Rock Research LLC
• Original Assignee: Micron Technology, Inc.
• Inventors: Moore, Scott E.
• Granted Patent: US 7,053,775 B2
• Time in Patent Office: Days
• US Class Current: 340/572.5
• CPC Class Codes: G06K 17/00 Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
• CPC Class Codes: G06K 7/10336 the antenna being of the near field type, inductive coil
• CPC Class Codes: G08B 13/2462 Asset location systems combined with EAS inventory, tracking, logistic G06Q10/00; entrance control systems G07C9/00

Abstract

A method and apparatus for tracking items automatically is described. A passive RFID (Radio Frequency IDentification) tag is used with a material tracking system capable of real-time pinpoint location and identification of thousands of items in production and storage areas. Passive RFID tags are attached to the item to be tracked, remote sensing antennas are placed at each remote location to be monitored, interrogators with several antenna inputs are connected to the sensing antennas to multiplex the antenna signals, and a host computer communicates with the interrogators to determine item locations to an exacting measure.

Claims

1. An alert apparatus for an RFID tracking system, the alert apparatus comprising:

a tuned circuit comprising an inductor and a capacitor tuned to a tuned frequency;

a resistor; and

a light emitting diode connected in series with the resistor, wherein the series connection of the resistor and the light emitting diode is connected across the tuned circuit.

2. The alert apparatus of claim 1, wherein the capacitor has a capacitance of about 3000 picofarads and the inductor has an inductance of about 800 microhenrys.

3. The alert apparatus of claim 1, wherein the alert apparatus is connected to a lot location configured to be monitored by the RFID tracking system.

4. An alert apparatus for an RFID tracking system having a tuned circuit, the alert apparatus comprising:

a second tuned circuit, connected across the input to the RFID system tuned circuit, the second tuned circuit tuned to a different frequency than the RFID system tuned circuit, the second tuned circuit comprising;

a capacitor; and

an inductor and an indicator connected in parallel, the inductor and indicator parallel connection connected in series with the capacitor.

5. The alert apparatus of claim 4, wherein the tuned circuit of the RFID tracking system is an LC circuit with a capacitance of about 3000 picofarads and an inductance of about 800 microhenrys.

6. The alert apparatus of claim 4, wherein the alert apparatus is connected to a lot location configured to be monitored by the RFID tracking system.

7. An alert apparatus for an RFID tracking system, the alert apparatus comprising:

a tuned circuit including a sensing antenna and having a tuned frequency; and

an alphanumeric display operatively coupled across an input to the tuned circuit.

8. The alert apparatus of claim 7, wherein the tuned frequency is about 125 kHz.

9. The alert apparatus of claim 7, wherein the alert apparatus is connected to a lot location configured to be monitored by the RFID tracking system.

10. The alert apparatus of claim 7, wherein the alert apparatus further includes a power source for the alphanumeric display, the power source separate from the input to the tuned circuit.

11. The alert apparatus of claim 7, wherein the alphanumeric display is configured to receive an ASCII signal at a frequency other than the tuned frequency to display tag information related to a tag tracked by the sensing antenna.

13. The alert apparatus of claim 12, wherein the coordinate mapping system is configured to provide location information of a sensing antenna in response to the RFID tracking system activating the sensing antenna.

14. The alert apparatus of claim 12, wherein the computer is configured to provide a visual indication of a sensing antenna scanning a location identified by the coordinate mapping system in response to the RFID tracking system activating the sensing antenna.

15. The alert apparatus of claim 12, wherein the computer is configured to display a visual indication of a sensing antenna scanning a location in terms of a stack of shelves and a shelf in the stack of shelves.

17. The alert apparatus of claim 16, wherein the tuned frequency is about 125 kHz.

18. The alert apparatus of claim 16, wherein the tuned circuit, the resistor, and the light emitting diode are connected to a lot location configured to be monitored by the RFID tracking system.

19. The alert apparatus of claim 16, wherein the coordinate mapping system is configured to provide location information of the sensing antenna in response to the RFID tracking system activating the sensing antenna.

20. The alert apparatus of claim 16, wherein the computer is configured to provide a visual indication of the sensing antenna scanning a location identified by the coordinate mapping system in response to the RFID tracking system activating the sensing antenna.

21. The alert apparatus of claim 16, wherein the computer is configured to display a visual indication of the sensing antenna scanning a location in terms of a stack of shelves and a shelf in the stack of shelves.

12. An alert apparatus for an RFID tracking system having a plurality of sensing antennas, the alert apparatus comprising:

a coordinate mapping system coupled to the RFID tracking system; and

a computer coupled to the coordinate mapping system, the computer system configured with a graphics display representative of the RFID tracking system to provide a visual indication of a sensing antenna scanning a location identified by the coordinate mapping system.

16. An alert apparatus for an RFID tracking system, the alert apparatus comprising:

a tuned circuit including a sensing antenna and having a tuned frequency;

a resistor;

a light emitting diode connected in series with the resistor, the series connection of the resistor and the light emitting diode connected across the tuned circuit;

a computer coupled to an interrogator of the RFID tracking system, the interrogator driving the tuned circuit, the computer system configured with a graphics display representative of the RFID tracking system; and

a coordinate mapping system operatively coupled to the computer, wherein the coordinate mapping system is configured to provide location information of the sensing antenna.

22. An alert apparatus for an RFID tracking system, the alert apparatus comprising:

a second tuned circuit connected across an input to a tuned circuit of the RFID tracking system, the tuned circuit of the RFID tracking system including a sensing antenna, the second tuned circuit tuned to a different frequency than the tuned circuit of the RFID tracking system, the second tuned circuit including a capacitor and inductor;

an indicator connected in series with the second tuned circuit, the series connection of the indicator and the second tuned circuit connected across the tuned circuit of the RFID tracking system;

a computer coupled to an interrogator of the RFID tracking system, the interrogator driving the tuned circuit of the RFID tracking system, the computer system configured with a graphics display representative of the RFID tracking system; and

a coordinate mapping system operatively coupled to the computer, wherein the coordinate mapping system is configured to provide location information of the sensing antenna.

23. The alert apparatus of claim 22, wherein the tuned circuit of the RFID tracking system is an LC circuit with a capacitance of about 3000 picofarads and an inductance of about 800 microhenrys.

24. The alert apparatus of claim 22, wherein the second tuned circuit and the indicator are connected to a lot location configured to be monitored by the RFID tracking system.

25. The alert apparatus of claim 22, wherein the coordinate mapping system is configured to provide location information of the sensing antenna in response to the RFID tracking system activating the sensing antenna.

26. The alert apparatus of claim 22, wherein the computer is configured to provide a visual indication of the sensing antenna scanning a location identified by the coordinate mapping system in response to the RFID tracking system activating the sensing antenna.

27. The alert apparatus of claim 22, wherein the computer is configured to display a visual indication of the sensing antenna scanning a location in terms of a stack of shelves and a shelf in the stack of shelves.

29. The alert apparatus of claim 28, wherein the tuned frequency is about 125 kHz.

30. The alert apparatus of claim 28, wherein the tuned circuit and the alphanumeric display are connected to a lot location configured to be monitored by the RFID tracking system.

31. The alert apparatus of claim 28, wherein the alphanumeric display is configured to receive an ASCII signal at a frequency other than the tuned frequency to display tag information related to a tag tracked by the sensing antenna.

32. The alert apparatus of claim 28, wherein the coordinate mapping system is configured to provide location information of the sensing antenna in response to the RFID tracking system activating the sensing antenna.

33. The alert apparatus of claim 28, wherein the computer is configured to provide a visual indication of the sensing antenna scanning a location identified by the coordinate mapping system in response to the RFID tracking system activating the sensing antenna.

34. The alert apparatus of claim 28, wherein the computer is configured to display a visual indication of the sensing antenna scanning a location in terms of a stack of shelves and a shelf in the stack of shelves.

36. The alert apparatus of claim 35, wherein the tuned circuit of the RFID tracking system is an LC circuit with a capacitance of about 3000 picofarads and an inductance of about 800 microhenrys.

37. The alert apparatus of claim 35, wherein the alert apparatus is connected to a lot location configured to be monitored by the RFID tracking system.

38. The alert apparatus of claim 35, wherein the bipolar driver circuit is configured to apply a reverse bias to the light emitting diode during a scan operation of the sensing antenna.

28. An alert apparatus for an RFID tracking system, the alert apparatus comprising:

a tuned circuit including a sensing antenna and having a tuned frequency;

an alphanumeric display operatively coupled across an input to the tuned circuit.

a computer coupled to an interrogator of the RFID tracking system, the interrogator driving the tuned circuit, the computer system configured with a graphics display representative of the RFID tracking system; and

a coordinate mapping system operatively coupled to the computer, wherein the coordinate mapping system is configured to provide location information of the sensing antenna.

35. An alert apparatus for an RFID tracking system, the alert apparatus comprising:

a tuned circuit including a sensing antenna, the tuned circuit responsive to a signal from a bipolar driver circuit;

a resistor; and

a light emitting diode connected in series with the resistor, the series combination of the resistor and the light emitting diode coupled across the tuned circuit, wherein the light emitting diode is configured with reverse polarity with respect to the tuned circuit.