Core structure with L-shaped back member and magnetic bonding material
OwnerAllen G. Rumplerinventor
Life of this patent
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Abstract
The present invention relates to a magnetic recording head and specifically the back bar of a multi-channel magnetic recording head for use in high performance multitrack disc files. Crosstalk is substantially reduced by incorporating a specially shaped back bar, such as a back bar having an L-shaped cross section to enclose and reduce the crosscoupling fringing fields from the back gaps. In addition, the use of an epoxy with a magnetic filler material is included to further reduce the back gap fringing fields. The above-mentioned techniques when used in combination with a limited dimension intertrack shield can greatly reduce the crosstalk between cores of a high track density flying head.
Claims9
A magnetic head capable of converting electrical variations into magnetic variations, and magnetic variations into electrical variations to impinge a magnetic media, said magnetic head comprising:
- a plurality of magnetic cores each comprising:
- a U-type core having a non-magnetic gap adjacent said magnetic media;
- a magnetic bar having a plurality of legs, forming the shape of a prism and having surfaces contiguous to said U-type core to provide a closed magnetic circuit;
- a bonding means for bonding said magnetic bar to said U-type core and for magnetically coupling said magnetic bar with said U-type core, said bonding means containing a magnetic material;
- and a plurality of magnetic flux shields, one of said plurality disposed between each pair of magnetic cores of said plurality of magnetic cores.
A magnetic head for a disc file, said head capable of converting electric variations into magnetic variations impinging a magnetic media, comprising
- an assembly body means to provide rigid structural support for a plurality of magnetic cores, to provide electrically insulative separation between each of said magnetic cores, and to provide a rigid, mechanical separation and spacing to fix the relative position of each magnetic core with respect to every other magnetic core;
- a plurality of magnetic cores fixed in said assembly body each comprising:
- a ferrite U-type core embedded in and extending through said body to, with said body, provide a smooth surface proximate said magnetic media;
- a non-magnetic front gap in said U-type core;
- a ferrite back bar contiguous to said U-type core and in the shape of a prism with an L-shaped cross section, said bar positioned to form a closed magnetic circuit across said U-type core;
- a ferrite filled epoxy disposed to bond said bar to said U-type core whereby magnetic flux leakage is substantially reduced;
- and
- a plurality of magnetic shields separating each magnetic core from the adjacent magnetic core.
A magnetic head capable of converting electrical variations into magnetic variations to impinge a magnetic media, said magnetic head comprising:
- a plurality of magnetic cores each comprising:
- a U-type core having a non-magnetic gap adjacent said magnetic media;
- a magnetic bar having an L-shaped cross section and formed in the shape of a prism, said magnetic bar having surfaces contiguous to said U-type core to provide a closed magnetic circuit;
- and
- a bonding means disposed to bond said U-type core and bar together.
A magnetic head capable of converting electric variations into magnetic variations impinging a magnetic media, comprising:
- an assembly body means to provide rigid structural support for a plurality of magnetic cores, to provide electrically insulative separation between each of said magnetic cores, and to provide a rigid, mechanical separation and spacing to fix the relative position of each magnetic core with respect to every other magnetic core;
- a plurality of magnetic cores fixed in said assembly body each comprising:
- a ferrite U-type core embedded in and extending through said body to, with said body, provide a smooth surface proximate said magnetic media;
- a non-magnetic front gap in said U-type core;
- a ferrite back bar contiguous to said U-type core and in the shape of a prism with an L-shaped cross section, said bar positioned to form a closed magnetic circuit across said U-type core;
- a ferrite filled epoxy disposed to bond said bar to said U-type core whereby magnetic flux leakage is substantially reduced;
- and
- a plurality of magnetic shields separating each magnetic core from the adjacent magnetic core.
Dependencies are inferred from the claim text.