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US 5,227,938 AGranted
High resolution magneto-optic read head
AssigneeThomson-CSF
InventorsJoseph Colineau, Sophie Neubert
Life of this patent
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Abstract
The magnetic head of the invention is composed of several micro-heads each of which comprises, on a substrate (2'), a garnet (3') and two pole pieces (7, 8) separated by a narrow air-gap (9).
Claims14
A high resolution magneto-optic read head, comprising:
- a substrate comprising a magneto-optic transducer material, said magneto-optic transducer material having a first major flat surface which is substantially parallel to a magnetic media;
- a first set of first and second pole pieces comprising magnetic material, the first pole piece of the first set disposed on a first region of said first major flat surface, the second pole piece of the first set disposed on a second region of said first major flat surface, wherein said second region is distinct from said first region, and an edge of each of the first and second pole pieces of the first set oppose one another across a gap.
A high resolution magneto-optic read head, comprising:
- a substrate comprising a magneto-optic transducer material having non-parallel first and second major flat surfaces;
- a first pole piece disposed on the first major flat surface;
- and
- a second pole piece disposed on the second major flat surface, wherein a first edge of the first pole piece opposes a second edge of the second pole piece across a gap, wherein the first pole piece and second pole piece comprise magnetic material.
1 more element
A method of reading a magneto-optic read head, comprising the steps of:
- projecting a beam towards at least one pole piece of a pair of pole pieces comprising magnetic material which are opposed to one another across a gap and which are disposed on separate regions of a flat surface of a magneto-optic transducer material, said flat surface being substantially parallel to a magnetic media;
- and
- detecting the intensity of light reflected from the magneto-optic transducer material of the head.
Dependencies are inferred from the claim text.