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US 6,151,192 AGranted
Magneto-optic multitrack reading head with a kerr effect layer
AssigneeThomson Consumer Electronics, Inc.
InventorFran.cedilla.ois Maurice
Life of this patent
Estimating the term…
Abstract
A magneto-optic multitrack reading head which features a structure with plane layers deposited in a course of a same deposition procedure. These layers include a magnetic layer exhibiting a Kerr effect, an inter-iron gap layer and a magnetic layer for magnetic circuit closing. The magnetic layers define adjacent elementary heads, so as to be able to read multitrack media.
Claims18
A magneto-optic multitrack reading head comprising:
- a magneto-optic transducer with a plane structure having at least one Kerr effect thin magnetic layer;
- at least one layer made of non-magnetic material;
- and
- one element made of magnetic material with magnetic circuit closing permeance, the one element made of magnetic material including a rejoining portion contacting the at least one Kerr effect thin magnetic layer, wherein the at least one layer made of non-magnetic material is positioned between the at least one Kerr effect thin magnetic layer and the one element made of magnetic material except at least at the rejoining portion;
- wherein an edge perpendicular to a main surface of the at least one Kerr effect thin magnetic layer, an edge perpendicular to a main surface of the at least one layer made of non-magnetic material, and an edge perpendicular to a main surface of the element made of magnetic material, are applied to a tape to be read.
2 more elements
A magneto-optic multitrack reading head, comprising:
- a first layer made of magnetic material with high permeance having a first thickness;
- a second layer made of non-magnetic material formed on the first layer and having a second thickness which is less than the first thickness;
- a third layer made of magnetic material exhibiting a Kerr effect formed on the second layer and having a third thickness which is less than the first thickness, said third layer receiving an incident optical beam, and wherein said second layer and said third layer are at least partially transparent to the incident optical beam;
- and
- wherein an edge perpendicular to a main surface of the first, second and third layers is applied to a tape to be read.
2 more elements
Dependencies are inferred from the claim text.