Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
248 words
A magnetic scanning transducer comprising an inner pole piece (1) comprised of a pair of poles (3, 3'') with first opposed ends forming a recording gap, a pair of outer pole pieces (6, 6''), ends (198, 198'') of which magnetically couple with the respective poles (3, 3'') of said inner pole piece (1), at least one signal coil magnetically coupled with said inner pole piece, a pair of scanning electromagnets (7, 7''), magnetically coupled across both sides of the other ends (4) of said poles of said inner pole piece (1) and both sides of the outer ends of said outer pole pieces (6, 6''), respectively, said pair of scanning electromagnets (7, 7'') being provided with scanning coils (10, 10'') which are energized for applying magnetizing forces to said inner pole piece, said magnetizing forces being of one polarity at one end of the recording gap and decreasing in value to zero between both ends of said gap and then reversing in polarity and increasing in value toward the other end of said gap, characterized in that the inner pole piece (1) is made of at least one plate of material having anisotropic soft magnetic characteristiCs, wherein the direction of greater permeability is at right angles with the axis of the recording gap and wherein said signal coil (11) is wound around the outer pole piece (6) and a central part (39) between said first end (3) and the other end (4) of said inner pole piece (1).
Claim 2
Dependent Claim
248 words
A magnetic scanning transducer comprising an inner pole piece (1) comprised of a pair of poles (3, 3'') with first opposed ends forming a recording gap, a pair of outer pole pieces (6, 6''), ends (198, 198'') of which magnetically couple with the respective poles (3, 3'') of said inner pole piece (1), at least one signal coil magnetically coupled with said inner pole piece, a pair of scanning electromagnets (7, 7''), magnetically coupled across both sides of the other ends (4) of said poles of said inner pole piece (1) and both sides of the outer ends of said outer pole pieces (6, 6''), respectively, said pair of scanning electromagnets (7, 7'') being provided with scanning coils (10, 10'') which are energized for applying magnetizing forces to said inner pole piece, said magnetizing forces being of one polarity at one end of the recording gap and decreasing in value to zero between both ends of said gap and then reversing in polarity and increasing in value toward the other end of said gap, characterized in that the inner pole piece (1) is made of at least one plate of material having anisotropic soft magnetic characteristiCs, wherein the direction of greater permeability is at right angles with the axis of the recording gap and wherein said signal coil (11) is wound around the outer pole piece (6) and a central part (39) between said first end (3) and the other end (4) of said inner pole piece (1).
Claim 3
Dependent Claim
41 words
The magnetic recording head of claim 1, wherein the material having anisotropic soft magnetic characteristic is a metal of soft magnetic characteristic having a plurality of fine parallel slits, the direction of the slits being in the direction of greater permeability.
Claim 4
Dependent Claim
36 words
The magnetic recording head of claim 1, wherein the plate of material having anisotropic soft magnetic characteristic is a non-magnetic plate, one face of which has a coating of a material of anisotropic soft magnetic characteristic.
Claim 5
Dependent Claim
42 words
The magnetic recording head of claim 3, wherein the non-magnetic plate is a glass plate and the coating is a metal of soft magnetic characteristic with a plurality of fine slits at right angles to the axis of said recording gap (2).
Claim 6
Dependent Claim
36 words
The magnetic recording head of claim 3, wherein the non-magnetic plate is a glass plate and the coating is a layer of vacuum-deposited permalloy, the layer having anistropic characteristic produced by a deposition under magnetic field.
Claim 7
Dependent Claim
97 words
The magnetic recording head of claim 3, wherein the inner pole piece (1) comprises a pair of poles (3, 3'') opposing each other across the recording gap 102, a pair of magnetic plates (139, 139''), respective first ends of which contact and are magnetically coupled to the respective rear faces of the pole pieces (3, 3''), and a constant permeability block (105) magnetically coupled to said magnetic plates (139, 139'') and to the scanning electromagnet (7, 7''), the constant permeability block being of material having a ratio of maximum permeability to initial permeability of less than 2.