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US 4,901,177 AGranted
Magnetic read head for a very narrow track
AssigneeCommissariat a l'Energie Atomique
InventorJean-Pierre Lazzari
Life of this patent
Estimating the term…
Abstract
Magnetic read head for very narrow track and production process. On a silicon substrate (10) is formed a magnetic circuit (P1, P2, P3), whose thickness is equal to the width of the track to be read. This magnetic circuit is interrupted by a magnetic spacer (20) and two slots (F1, F2), in which are inserted elements sensitive to the magnetic field, e.g. magnetoresistors. The latter are connected to an integrated circuit (12) in the silicon substrate. Application to the reading of information recorded on a magnetic track.
Claims2
A magnetic read head comprising:
- a semiconductor substrate having an upper face;
- a spacer formed by a magnetic vertical wall perpendicular to said upper face, said spacer having a height at least equal to the width of a track to be read;
- a loop-like magnetic circuit formed by a magnetic coating, said circuit having two pole pieces separated by said spacer, said magnetic circuit being interrupted by two slots arranged symmetrically with respect to a plane passing through said spacer;
- two elements having an electric property sensitive to a magnetic field, said two elements being inserted in said slots,
- an electronic circuit integrated in said semiconductor substrate, said circuit having at least one regulated current generator (G) and a differential amplifier (A) with two inputs respectively connected to the two elements sensitive to the magnetic field and connected in opposition, said amplifier having an output supplying a reading signal.
2 more elements
Dependencies are inferred from the claim text.