Antipilferage tags and their use

Details Antipilferage tags and their use Antipilferage tags and their use

1989-04-10

1991-02-12

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

310118, 340572, 340384E, G08B 1318

Patent

active

049927760

ABSTRACT:
A housing contains a pick-up coil for detecting an external magnetic field; a power supply; a tone generator; and an electric circuit powered by said power supply and arranged to activate said tone generator in response to an output from said magnetic field pick-up including a piezoelectric material surrounded about its circumference by a thin layer of magnetostrictive material. Since the electrical output of the piezoelectric material is dependent on the stress imparted to it by the magnetostrictive material, and since the dimensional change in the magnetostrictive material is proportional to the magnetic field in the environment in which the magnetostrictive material is located, the electrical output of the piezoelectric material provides a measure of magnetic field strength.

REFERENCES:
patent: 3781664 (1973-12-01), Rorden
patent: 4335377 (1982-06-01), Boslic
patent: 4812811 (1989-03-01), sbrink et al.

Affiliated with

Also associated with

Rating

Antipilferage tags and their use does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Antipilferage tags and their use, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Antipilferage tags and their use will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-22857