Dynamic magnetic information storage or retrieval – Record medium – In container
Patent
1993-07-19
1994-04-26
Pianalto, Bernard
Dynamic magnetic information storage or retrieval
Record medium
In container
360133, 360134, 360135, 427128, 428900, 428694R, H01F 1002
Patent
active
053072286
ABSTRACT:
A magnetic field indicator is provided which visually indicates the presence of a potentially harmful magnetic field by means of a magnetically responsive additive. In one embodiment, the additive comprises ferrite-encapsulating microspheres which contain ferrite flakes. The ferrite flakes are movably suspended within the microspheres so that the flakes are free to align with the lines of flux of a magnetic field. In the presence of a magnetic field, the ferrite flakes align themselves with the lines of flux of the magnetic field, thereby changing the reflectivity and other visual characteristics of the material which incorporates the ferrite flakes, so that an observer is able to visually detect the presence of a magnetic field. The magnetic field indicator may be embodied in accordance with a variety of applications. These embodiments include a coating, a solid, a gel, and a cloth, each of which may be affixed to, or incorporated within, the housing of a magnetic storage device, so that a visual indication of the presence of a potentially damaging magnetic field is provided. In a preferred embodiment of the invention, a pattern is magnetically written on the surface of a material which incorporates the magnetically responsive additive. This pattern provides a higher contrast between the activated state (that state in which a magnetic field is detected) and the unactivated state of the magnetic field indicator device. The present invention may also be employed as a display means for electro-magnetically controlling visual displays, polarizing windows, and shutters.
REFERENCES:
patent: 4283438 (1981-08-01), Lee
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