Radio frequency identification tag based tray and tray receiving method and apparatus

• US 7,411,502 B2
• Filed: 04/28/2006
• Issued: 08/12/2008
• Est. Priority Date: 04/28/2006
• Status: Expired due to Fees

• Current Assignee: Motorola Solutions, Inc.
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Collins, Timothy J., Perri, Robert A., Khan, Andrew M., Rachwalski, Richard S., Bullock, Michael K.
• Primary Examiner(s): Bugg; George A
• Assistant Examiner(s): Pham; Lam P
• Application Number:
  US11/380,729
• Publication Number:
  US 20070252694A1
• Time in Patent Office: 837 Days
• Field of Search: 340/10.1, 340/10.51, 340/568.1, 340/568.7, 3405721-5727, 340/825.49, 235375-385, 235/492, 700/214, 700/215
• US Class Current: 340/572.1
• CPC Class Codes: A47J 39/006 for either storing and preparing or for preparing food on serving trays, e.g. heating, thawing, preserving

Abstract

A tray (201) comprises electrically conductive material and has at least one hand-graspable fixture (203). This hand-graspable fixture comprises an electrical conductor (301) disposed in a location that is likely to be operably interacted with by a human who grasps the hand-graspable fixture. A capacitively-coupled RFID tag is then disposed on the hand-graspable fixture with a first antenna plate (303) being electrically coupled to the tray and a second antenna plate (304) that electrically couples to the electrical conductor. A corresponding tray receiving compartment (400) has a front lip (401) over which the tray must pass and upon which the tray will rest when properly disposed within the tray receiving compartment. One or more capacitively-coupled RFID tag reader antennas (402) are disposed proximal to the front lip. These antennas may be positioned to facilitate reading the capacitively-coupled RFID tag when the tray is properly disposed within the tray receiving compartment.

Claims

1. A apparatus comprising:

a tray comprised, at least in part, of electrically conductive material;

at least one hand-graspable fixture affixed to the tray wherein the hand-graspable fixture comprises, at least in part, an electrical conductor that is disposed in a location to be operably interacted with by a human who grasps the hand-graspable fixture;

a capacitively-coupled radio frequency identification tag disposed on the hand-graspable fixture and having a first antenna plate that is electrically coupled to the tray and a second antenna plate that is electrically coupled to the electrical conductor.

2. The apparatus of claim 1 wherein the tray is fully comprised of electrically conductive material.

3. The apparatus of claim 1 wherein the tray further comprises sidewalls disposed about a perimeter of the tray.

4. The apparatus of claim 1 further comprising at least two of the hand-graspable fixtures affixed to the tray.

5. The apparatus of claim 4 wherein two of the hand-graspable fixtures are affixed on opposing sides of the tray.

6. The apparatus of claim 1 wherein the at least one hand-graspable fixture is comprised, in part, of electrically non-conductive material.

7. The apparatus of claim 1 wherein the capacitively-coupled radio frequency identification tag contains information identifying components as are properly contained within the tray.

8. The apparatus of claim 1 wherein the electrical conductor comprises an exposed electrical conductor that is disposed in a location likely to be contacted by a human who grasps the hand-graspable fixture.

9. An apparatus comprising:

a tray receiving compartment having a front lip over which the tray must pass when inserted;

the front lip comprises at least one exposed electrical conductor that is electrically coupled to a corresponding one of at least one capacitively-coupled radio frequency identification tag reader antenna, such that a tray which is only partially inserted at rest within the tray receiving compartment will complete an electrical circuit path between the at least one exposed electrical conductor and a grounded electrically conductive surface to thereby facilitate detecting incomplete insertion of the tray within the tray receiving compartment;

at least one capacitively-coupled radio frequency identification tag reader antenna disposed proximal to the front lip and being positioned to facilitate reading a capacitively-coupled radio frequency identification tag as comprises a part of the tray when the tray is properly disposed within the tray receiving compartment.

10. The apparatus of claim 9 wherein the front lip is comprised of electrically non-conductive material.

11. The apparatus of claim 9 wherein the tray receiving compartment is sized to properly receive a plurality of the trays.

12. The apparatus of claim 9 wherein the at least one capacitively-coupled radio frequency identification tag reader antenna comprises a plurality of capacitively-coupled radio frequency identification tag reader antennas.

13. The apparatus of claim 9 wherein the tray receiving compartment further comprises the grounded electrically conductive surface upon which the tray will rest when the tray is only partially inserted at rest within the tray receiving compartment.

14. The apparatus of claim 9 wherein the front lip is one of:

substantially flush with a surface of the tray receiving compartment;

protruding above the surface of the tray receiving compartment.

15. A method comprising:

providing a tray comprised, at least in part, of;

electrically conductive material;

at least one hand-graspable fixture wherein the hand-graspable fixture comprises, at least in part, an electrical conductor that is disposed in a location to be operably interacted with by a human who grasps the hand-graspable fixture;

a capacitively-coupled radio frequency identification tag disposed on the hand-graspable fixture and having a first antenna plate that is electrically coupled to the electrically conductive material and a second antenna plate that is electrically coupled to the electrical conductor;

providing a tray receiving compartment having a front lip over which the tray must pass when inserted;

providing at least one capacitively-coupled radio frequency identification tag reader antenna disposed proximal to the front lip and being positioned to facilitate reading the capacitively-coupled radio frequency identification tag when the tray is properly disposed within the tray receiving compartment.

16. The method of claim 15 wherein the tray comprises at least two of the hand-graspable fixtures.

17. The method of claim 16 wherein two of the hand-graspable fixtures are affixed on opposing sides of the tray.

18. The method of claim 15 wherein providing a tray receiving compartment further comprises providing a grounded electrically conductive surface upon which the tray will rest when the tray is only partially inserted at rest within the tray receiving compartment.

19. The method of claim 16 wherein providing a tray receiving compartment having a front lip further comprises providing at least one exposed electrical conductor that is electrically coupled to the at least one capacitively-coupled radio frequency identification tag reader antenna, such that a tray which is only partially inserted at rest within the tray receiving compartment will complete an electrical circuit path between the at least one exposed electrical conductor and the grounded electrically conductive surface to thereby facilitate detecting incomplete insertion of the tray within the tray receiving compartment.