Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
217 words
A thin film magnetic transducer of the kind that can be used for both reading and writing with respect to a track on a magnetic recording medium and that is formed of layers built up by deposition on a deposition surface of a non-magnetic substrate (20), an air bearing surface (ABS) being provided at right angles to the deposition surface, the deposited layers including two layers of magnetic material (14, 15) defining a yoke (13) with a pole tip region (P), with a transducing gap (18) at the air bearing surface (ABS), and a back region (B) and a read/write coil (10) in coupling juxtaposition relative to the back region (B) characterised in that (a) the layers (14, 15) at the pole tip region (P), for a distance (D) from the air bearing surface (ABS) parallel to the deposition surface, are of width (W) parallel to both surfaces and (b) the thickness and width of the layers (14, 15) in the back region (B) are greater than those dimensions of the layers on the pole tip region, the increase in width being accommodate by a taper of angle 0 whereby, in the unitary deposited structure, reading definition is provided by the polo tip region (P) and resistance to writing saturation is provided by the back region (B).
Claim 2
Dependent Claim
217 words
A thin film magnetic transducer of the kind that can be used for both reading and writing with respect to a track on a magnetic recording medium and that is formed of layers built up by deposition on a deposition surface of a non-magnetic substrate (20), an air bearing surface (ABS) being provided at right angles to the deposition surface, the deposited layers including two layers of magnetic material (14, 15) defining a yoke (13) with a pole tip region (P), with a transducing gap (18) at the air bearing surface (ABS), and a back region (B) and a read/write coil (10) in coupling juxtaposition relative to the back region (B) characterised in that (a) the layers (14, 15) at the pole tip region (P), for a distance (D) from the air bearing surface (ABS) parallel to the deposition surface, are of width (W) parallel to both surfaces and (b) the thickness and width of the layers (14, 15) in the back region (B) are greater than those dimensions of the layers on the pole tip region, the increase in width being accommodate by a taper of angle 0 whereby, in the unitary deposited structure, reading definition is provided by the polo tip region (P) and resistance to writing saturation is provided by the back region (B).
Claim 3
Dependent Claim
32 words
A transducer as claimed in claim 1, characterised in that the length (D) of the pole tip region (P) is approximately 5/d where d is the recording density on the recording medium.
Claim 4
Dependent Claim
41 words
A transducer as claimed in claim 1 or claim 2, characterised in that the length (D) of the pole tip region (P) is between 12 and 18 microns when the recording density or the medium is 400 flux charges per millimetre.
Claim 5
Dependent Claim
42 words
A transducer as claimed in any one of the preceding claims characterised in that the thickness of the back region (B) magnetic layers (14, 15) is at least 60% greater than the thickness of the pole tip region (P) layers (14, 15).
Claim 6
Dependent Claim
27 words
A transducer as claimed in any one of the preceding claims characterised in that the back region (B) tapers by an angle 0 between 30° and 60°.
Claim 7
Dependent Claim
40 words
A transducer as claimed in any one of the preceding claims characterised in that the two magnetic layers (14, 15) are parallel (to X) to form transducing gap (18) and then diverge (X to Y) to the back region (B).