Method and device for orientating and fixing in a determined dir

Details Method and device for orientating and fixing in a determined dir Method and device for orientating and fixing in a determined dir

1978-10-23

1980-04-08

Wolff, John H.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

G11B 502

Patent

active

041975634

ABSTRACT:
The invention comes within the field of magnetic recording. A method of ontating and fixing in a determined direction magnetic particles contained in a polymerizable ink (2) spread on a support (1), characterized by the following operations; the support is conveyed towards a zone (5) subjected to a magnetic field whose orientation and direction are adjusted as a function of time in accordance with the message to be written, the support passing through the zone at an adjustable speed, and while the support is passing therethrough, the ink deposited on it is polymerized by means of ultraviolet radiation from a lamp (10) which reaches only a part of the zone submitted to the magnetic field, said part corresponding to that through which said inked support last passes.
The invention applies in particular to identity documents.

REFERENCES:
patent: 3879754 (1975-04-01), Ballinger
patent: 3982334 (1976-09-01), Tate
patent: 3998160 (1976-12-01), Pearce
patent: 4013462 (1977-03-01), Goffe

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