Three pole tip read after write transducer
阅读：984发布：2023-04-25
专利汇可以提供Three pole tip read after write transducer专利检索，专利查询，专利分析的服务。并且A magnetic recording head is provided with a pair of pole tips separated by a high-reluctance gap, and the pole tips are coupled together by a low-reluctance path. The head is further provided with a third pole tip. A magnetic medium, such as a tape, is passed over the head in such a manner that any point on the medium passes over the gap and thereafter over the third pole tip. A pair of coils are wound around the low-reluctance coupling path, one of which is used to cause a magnetic field to exist in the gap and thereby be applied to the medium, and the other of which is used to detect any change in the direction of the magnetic field on the medium as it passes in the vicinity of the third pole tip. Means are further provided to determine whether the signal provided by the detecting coil corresponds to an expected signal.，下面是Three pole tip read after write transducer专利的具体信息内容。
1. A magnetic head core element comprising: a member having a first and a second pole tip, there being a low-reluctance path connecting said first and said second pole tips, said first and said second pole tips being separated by a given distance, such that a high-reluctance gap is formed between said first and second pole tips; said member further having a third pole tip which is coupled by said low-reluctance path to said first and second pole tips, said second and third pole tips being separated from one anothEr by less than said given distance; said third pole tip being capable of sensing any change in a magnetic field existing in the vicinity thereof.
2. The invention according to claim 1 wherein said third pole tip senses any directional change in a magnetic field existing in the vicinity thereof by causing a change in magnitude of the flux flowing in said low-reluctance path coupling said first and third pole tips due to the existence of said magnetic field.
3. A magnetic recording and reproducing head for recording on and reading from a passing medium comprising: a magnetic core structure which includes first and second pole tips separated by a nonmagnetic gap and a third pole tip, said first, second, and third pole tips being arranged so that any point on said medium passes said first pole tip before passing second pole tip and passes said second pole tip before passing said third pole tip; first means responsive to a signal applied thereto for causing a first magnetic field to exist in said gap to thereby cause a magnetic field to exist on said medium between a first and a second point of said medium, said second point being a function of the position of said medium with respect to said second pole tip at the time said magnetic field exists in said gap; and second means responsive to the existence of any change in the magnetic field of said second point passing in the vicinity of said third pole tip for providing a signal indicative of a change in the magnetic field of said medium at said second point.
4. The invention according to claim 3 wherein said head is capable of causing to exist on a medium which is capable of being magnetized and which is passed in the vicinity of said head, a plurality of incremental magnetic fields, each one of which exists along a unique incremental length of said medium, each of said fields being capable of having one of two directions.
5. The invention according to claim 4: wherein each of said incremental lengths have a given distance; and wherein the distance separating said first and second pole tips is greater than said given distance and less than twice said given distance.
6. The invention according to claim 4: wherein each of said incremental lengths have a given distance; and wherein the distance separating said second pole tip and said third pole tip is a certain distance plus a fixed whole number multiple, including zero, of said given distance.
7. The invention according to claim 6 wherein said distance separating said second pole tip and said third pole tip is a certain distance which is less than said given distance.
8. The invention according to claim 3: wherein said core structure further includes a low-reluctance path connecting said first, second, and third pole tips; wherein said first means includes a first coil wound on said path such that whenever a voltage is applied across said first coil, a flux is induced in said path which causes said first field to exist; wherein said second means includes a second coil wound on said path; and wherein whenever said second magnetic field exists in the vicinity of said third pole tip, a second flux is caused to flow through said path, said second flux being dependent upon the intensity and direction of said second magnetic field, said second flux causing a voltage to appear across said second coil which is proportional to the time rate of change of said second flux.
9. The invention according to claim 8: wherein said first means further includes means to cause said first voltage to be selectively applied across said first coil and further to cause said first voltage to have one value during one application to said first coil and a different value during another application to said coil; and wherein said second means further includes means for selectively sensing the voltage across said second coil during a time when there is no voltage applied to said first coil.
10. In a magnetic recording And reproducing system which includes a magnetic head having a nearly closed loop low-reluctance path separated by a narrow gap, said gap separating a leading pole tip from a trailing pole tip; means for causing a medium capable of being magnetized to pass in the vicinity of said gap in a direction form said leading pole tip to said trailing pole tip; bit recording means, including a first winding positioned on said low-reluctance path, which in response to intermittently occurring voltage pulses applied to said first winding causes a magnetic fields to exist in said gap during the occurrance of each of said voltage pulses, said pulses occurring in accordance with a given binary code which is to be recorded on said medium, wherein adjacent increments of said medium become magnetized as said medium passes in the vicinity of said gap; the direction of the field in each of said increments being determined by said magnetic fields caused to exist in said gap such that certain of the junctions of adjacent ones of said increments have opposite magnetic poles; an improvement comprising: a reproducing pole tip positioned a fixed distance away from said trailing pole tip on said low-reluctance path such that any point on said medium passes in the vicinity of said reproducing pole tip after it has passed in the vicinity of said trailing pole tip; and bit reproducing means, including a second winding positioned on said low-reluctance path, for providing a signal indicative of any flux change in said low-reluctance path resulting from one of said certain increment junctions passing in the vicinity of said reproducing pole tip.
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