Magnetic head assembly
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorKowhei Nishikawa
Life of this patent
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Abstract
A magnetic head formed by coupling a plurality of U-shaped cores via a spacer plate close to both surfaces of a shield layer forming magnetic plates each with a width of the cores equal to a desired width of magnetic track, forming a spacer auxiliary slot in a shield plate comprising the magnetic plate and the spacer plate, bisecting the coupled cores to define a gap therebetween with reference to the auxiliary slot and forming a desired magnetic gap by interposing a spacer into the gap of the bisected cores.
Claims7
A magnetic head of the type having a plurality of head elements and coil windings comprising:
- a shield plate assembly comprising first and second nonmagnetic spacer plates disposed on each side of a magnetic plate, each of said spacer plates containing an aperture for receiving the windings of a head coil and having an auxillary slot;
- first and second U-shaped cores on the free side of each spacer plate and first and second back cores;
- said first and second back cores each having a head coil winding supported thereon, said back cores being located on the free side of each of said U-shaped cores with said head coils disposed within said apertures, said back cores being in magnetic coupling relationship with an adjacent U-shaped core;
- said shield plate assembly and U-shaped cores having a common magnetic gap located therein adjacent an edge thereof and remote from said head coils;
- a spacer located within said common magnetic gap for maintaining the spacing of said magnetic gap;
- and
- a shield case for housing said shield plate assembly, back cores, and U-shaped cores, said shield case having an opening for exposing said magnetic gap to a record medium, wherein two magnetic circuits are formed, each having a gap which is in precise alignment with the remaining gap but separated therefrom.
A multichannel magnetic head comprising:
- a shield plate assembly comprising at least one magnetic plate defining a predetermined channel spacing, said magnetic plate having a longitudinal slot, and at least one spacer plate of non-magnetic material located on each surface of said magnetic plate, said spacer plate having a longitudinal slot coincident with said magnetic plate slot, and a larger slot at the midsection of said longitudinal slot;
- first and second U-shaped cores each comprising a plurality of U-shaped magnetic plates to define a predetermined channel width, said cores being located against each spacer plate whereby said predetermined channel width is centered with respect to said longitudinal slot;
- first and second back cores located on each of said U-shaped cores, said back cores having a core portion disposed over said larger slot for supporting a winding in said slot, said back cores forming a magnetic circuit with an adjacent U-shaped core;
- said U-shaped cores, shield plate assembly having a common slot formed along an outside surface adjacent an edge thereof and remote from said head coils for providing a magnetic gap;
- a spacer inserted in said gap;
- and
- a shield case for enclosing said shield plate assembly, U-shaped cores and two back cores, said shield core having an opening corresponding to the location of said gap whereby said gap is exposed for contacting a recording surface, said gap being common to two magnetic circuits whereby said magnetic circuits are maintained in precise alignment.
Dependencies are inferred from the claim text.