Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1992-10-09
1994-10-11
Peng, John K.
Communications: electrical
Condition responsive indicating system
Specific condition
340551, G08B 1314
Patent
active
053551206
ABSTRACT:
The tag includes an active strip of magnetic material that, when in the presence of a magnetic bias field within a predetermined magnetic field intensity range, responds to excitation by electromagnetic radiation of a first predetermined frequency by radiating electromagnetic radiation of a second predetermined frequency that is a frequency-divided quotient of the first predetermined frequency; and a pair of bias strips of magnetic material disposed in relation to the active strip in a common housing with the active strip for magnetically biasing the active strip with a magnetic bias field within the predetermined magnetic field intensity range. The bias strips are cut from an extruded magnetic material ribbon having a width less than the length of the active strip and a magnetic moment parallel to the lateral dimension of the ribbon. The bias strips are cut at an oblique angle to the lateral dimension of the ribbon so that each bias strip has an oblique magnetic moment having longitudinal and lateral components. The bias strips are disposed in the housing such that their respective longitudinal components have the same orientation and their respective lateral components oppose each other. The active strip is disposed in a cavity for vibration. The cavity walls are coated with a permanent anti-static material to prevent the active strip from being attracted thereto. In one embodiment, a first set of an active strip and a pair of bias strips is disposed perpendicular to a second set of an active strip and a pair of bias strips.
REFERENCES:
patent: 4682154 (1987-07-01), Fearon et al.
patent: 4727360 (1988-02-01), Ferguson et al.
patent: 4727668 (1988-03-01), Anderson et al.
patent: 4829288 (1989-05-01), Eisenbeis
patent: 4882569 (1989-11-01), Dey
patent: 4910499 (1990-03-01), Benge et al.
patent: 4935724 (1990-06-01), Smith
patent: 4940966 (1990-07-01), Pettigrew et al.
patent: 4956636 (1990-09-01), Sansom et al.
Ferguson Lucian G.
Thomas William D.
Callan Edward W.
Mullen Jr. Thomas J.
Peng John K.
Security Tag Systems, Inc.
LandOfFree
Frequency-dividing-transponder tag does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Frequency-dividing-transponder tag, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency-dividing-transponder tag will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1661992