Magnetic transducer structure

Claim 2

A magnetic transducer structure formed of a stack of individually shaped thin layers coated on a dielectric nonmagnetic substrate having substantially parallel front and rear edges, the stack comprising a pair of magnetic layers having a front to rear axis of symmetry with respect to the substrate, spaced apart at one end to define an air-gap face end portion adjacent one edge of said substrate and contacting one another at their opposite end portions at a point between the front and rear edges of said substrate, and a flat helix insulated conductor coil at least a part of which surrounds the contacting portions of said magnetic layers wherein a plurality of insulating layers of the stack together define a flat insulating helix having portions of its turns surrounding said contacting portions of said magnetic layers and having portions of its turns positioned between the magnetic layers at the airgap faces thereof, wherein conductive layers of smaller dimensions in the plane parallel to said substrate are positioned between said insulating layers to define a conductive flat helix embedded within the insulating helix with the exception of rear terminal portions which extend substantially to the rear edge of said substrate, wherein the turns of the insulating helix are in substantially mutual registration and the turns of the conductive helix are also in substantially mutual registration and wherein each one of said insulating and conductive layers in the helixes either has an axis of symmetry coincident with the said front to rear axis of symmetry of the pair of magnetic layers or is a mirror image of another one of the layers with respect to said front to rear axis of symmetry.

Claim 3

A magnetic transducer structure as defined by claim 1 comprising the following minimal stack of layers on said substrate; a. a first magnetic layer, one edge thereof substantially registering with the front edge of the substrate and which extends over a pre-determined length towards the rear edge of said substrate with an axis of symmetry coincident with the front to rear direction of said substrate; b. a first insulating U-shaped layer the transverse branch of which substantially registers with said front edge of said substrate and layer (a) and the legs of which surround said layer (a) in close proximity thereto, each extending towards the rear edge of said substrate over a greater length than that of layer (a); c. a first U-shaped conductive layer, the transverse branch and legs of which are of smaller widths than those of layer (b) over which they are applied, one leg extending substantially up to the rear edge of said substrate and its other leg extending beyond the length of the legs of layer (b); d. a Second insulating layer identical to layer (b); e. a third insulating layer of asymmetrical shape with respect to the axis of symmetry of layer (a), masking the longer leg of layer (c) up to a distance from the rear edge of said substrate less than the distance of said rear edge to the other leg of layer (c); f. a transverse conductive layer contacting the exposed part of the shorter leg of layer (c) and symmetrically extending with respect to the axis of symmetry of layer (a); g. a fourth insulating layer, which is a mirror image of layer (a) with respect to the axis of symmetry of layer (a); h. a third conductive layer which is a mirror image of layer (c) with respect to the axis of symmetry of layer (a); j. a fifth insulating layer identical to layer (b); k. a second magnetic layer identical to layer (a); Such structure further comprising, respectively, for each additional coil turn, an insertion after layer (g), said insertion being:

Claim 4

A magnetic transducer structure according to claim 2, further comprising, for each intermediate tap of the coil; q. a conductive layer extending substantially up to the rear edge of the substrate from a distance from said rear edge enabling contact with a layer f) and inserted prior or after such a layer f) in the stack.

Claim 5

A magnetic transducer structure according to claim 2, wherein the occurrences of the layers d) and e), respectively the occurrences of the layers m) and h), are permutated in the stack.

Claim 6

A magnetic transducer structure according to claim 2, wherein the layers n) and p) are permutated in each turn requesting a reversal of its direction of progression with respect to the next preceding one in the stack.

Claim 7

A magnetic transducer structure according to claim 2, wherein, prior the layer a), respectively after the layer k), the stack includes at least one additional turn as per the sequence of layers 1) to p), the layers n) and p) in such sequences being permutated with respect to their order of occurrence in the turns established in the stack between the layers a) and k).