R.F. suppression technique for collective objects management system using R.F. object identification

• US 6,664,895 B2
• Filed: 01/02/2001
• Issued: 12/16/2003
• Est. Priority Date: 01/02/2001
• Status: Active Grant

• Current Assignee: Magnex Corporation
• Original Assignee: Magnex Corporation
• Inventors: Zhu, Shengbo
• Primary Examiner(s): Horabik, Michael
• Assistant Examiner(s): Nguyen, Nam V
• Application Number:
  US09/751,198
• Publication Number:
  US 20020084911A1
• Time in Patent Office: 1,078 Days
• Field of Search: 340/825.49, 340/540, 340/572.4, 340/570, 340/691.1, 340/691.6, 340/691.8, 340/815.45, 340/815.9, 340/539, 340/815.4, 340/635, 340/572.1, 340/572.2, 340/572.3, 327/187, 326/104, 326/125
• US Class Current: 340/570
• 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

Abstract

A collective objects management system for objects such as documents contained in file folders in drawers of file cabinets. Each file folder has an electrical circuit with a visible indicator mounted on the file folder. Each folder circuit has a crystal which is responsive to an R.F. signal of a specific frequency, the frequency being different for each folder circuit. An associated computer operates an R.F. signal generator to produce an R.F. signal at the frequency of the particular folder circuit of the file folder selected for retrieval. To aid the user, each file drawer has a visible indicator mounted on the front panel, the panel indicator being illuminated when the sought folder is contained in that drawer. Each folder circuit includes a latch having an input coupled to the respective crystal and an output coupled to the associated indicator, the latch being responsive to the resonant state of the crystal for activating the indicator and for providing a resonant state feedback signal for terminating the r.f. signal. The R.F. signal generator can be operated in a sweep mode for checking the integrity of the file. A collective objects management system can be applied to a wide variety of collective objects management systems, such as supermarkets, automobile parts distributors, and various manufacturing operations.

Claims

1. In a system for managing objects distributed in an object location space, said system comprising a receptacle for a plurality of objects, said receptacle having a pair of electrically conductive members;

a pair of electrically conductive signal leads coupled to said pair of electrically conductive members; and

a plurality of r.f. circuits each associated to a different one of said objects, each of said plurality of r.f. circuits having a pair of electrically conductive terminals in electrical contact with said electrically conductive members when the associated object is located in said receptacle, a crystal resonant at a specific frequency and an indicator activated whenever the associated crystal detects an r.f. signal at the specific frequency of that crystal, the resonant frequency of each of said crystals being different from the remaining ones of said crystals so that an r.f. signal applied to said pair of electrically conductive signal leads causes only one of said plurality of crystals to resonate and only the associated indicator to be activated;

the improvement wherein each of said plurality of r.f. circuits includes a latch having an input coupled to the respective crystal and an output coupled to the associated indicator, said latch being responsive to the resonant state of said crystal for activating said indicator and for providing a resonant state feedback signal for terminating said r.f. signal.

2. The system of claim 1 wherein said indicator is a visible indicator.

3. The system of claim 2 wherein said visible indicator is an LED.

4. The system of claim 1 wherein said object location space comprises a file cabinet and wherein said objects are file folders.

5. In a system for managing objects distributed in an object location space, said system comprising a plurality of receptacles for a plurality of objects, each of said receptacles having a pair of electrically conductive members;

a plurality of pairs of electrically conductive signal leads each coupled to a different one of said plurality of pairs of electrically conductive members, each of said plurality of pairs of electrically conductive signal leads being coupled in parallel to a common signal input terminal; and

a plurality of r.f. circuits each associated to a different one of said objects, each of said plurality of r.f. circuits having a pair of electrically conductive terminals in electrical contact with one of said plurality of pairs of electrically conductive members when the associated object is located in one of said receptacles, a crystal resonant at a specific frequency and an indicator activated whenever the associated crystal detects an r.f. signal at the specific frequency of that crystal, the resonant frequency of each of said crystals being different from the remaining ones of said crystals so that an r.f. signal applied to said common input terminal causes only one of said plurality of crystals to resonate and only the associated indicator to be activated;

the improvement wherein each of said plurality of r.f. circuits includes a latch having an input coupled to the respective crystal and an output coupled to the associated indicator, said latch being responsive to the resonant state of said crystal for activating said indicator and for providing a resonant state feedback signal for terminating said r.f. signal.

6. The system of claim 5 wherein said indicator is a visible indicator.

7. The system of claim 6 wherein said visible indicator is an LED.

8. The system of claim 5 wherein said object location space comprises a file cabinet and wherein said objects are file folders.

9. For use in a system for managing objects distributed in an object location space having at least one receptacle with a pair of electrically conductive members;

a plurality of r.f. circuits each associated to a different object, each of said plurality of r.f. circuits having a pair of electrically conductive terminals in electrical contact with said electrically conductive members when the associated object is located in said receptacle, a crystal resonant at a specific frequency and an indicator activated whenever the associated crystal detects an r.f. signal at the specific frequency of that crystal, the resonant frequency of each of said crystals being different from the remaining ones of said crystals so that an r.f. signal applied to said pair of electrically conductive members causes only one of said plurality of crystals to resonate and only the associated indicator to be activated;

the improvement wherein each of said plurality of r.f. circuits includes a latch having an input coupled to the respective crystal and an output coupled to the associated indicator, said latch being responsive to the resonant state of said crystal for activating said indicator and for providing a resonant state feedback signal for terminating said r.f. signal.

10. The improvement of claim 9 wherein said indicator is a visible indicator.

11. The improvement of claim 10 wherein said visible indicator is an LED.

12. The improvement of claim 9 wherein said object location space comprises a file cabinet and wherein said objects are file folders.