The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 21, 1995
Filed:
Jul. 31, 1992
Jean-Claude Lhureau, Saint Genevieve Des Bois, FR;
Christian Maillot, Orsay, FR;
Thomson-CSF, Puteaux, FR;
Abstract
The disclosure relates to a magneto-optical reading head. A magneto-optical head comprises an optically active part which is a very thin magnetic layer that causes the rotation of the plane of polarization of the light as a function of its magnetic polarization which is itself linked to the magnetic polarization of the magnetic tape that bears the information elements to be read and moves past the thin layer. Instead of using a focusing optical device to illuminate the optically active part, it is provided that the head will comprise an optical guide which ends directly before the active part and is such that the plane of incidence of the light rays on the optically active part is perpendicular to the general direction of elongation of a gap region before which the magnetic tape passes. There is also provision, preferably, for a photosensitive sensor (linear array) that is integrated into the head so as to be at a distance of less than a few micrometers from the optically active part on the path of the beam modulated by this part. FIG. 5.