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公开(公告)号：CA1127298A
公开(公告)日：1982-07-06
申请号：CA339634
申请日：1979-11-13
Applicant: IBM
Inventor： JONES ROBERT E JR , NYSTROM WALTHER
Abstract: THIN FILM INDUCTIVE TRANSDUCER This thin film inductive transducer comprises a yoke structure consisting of a pole tip region which joins a back region. To maximize resolution during reading of magnetic transitions from a moving magnetic recording medium, the pole tip region is of preselected constant relatively narrow width, and composed of magnetic layers having edges which extend in a direction normal to the medium for a distance D from an air bearing surface ABS to the back region and having a small thickness at least adjacent the ABS. To minimize the effects of spurious signals from adjacent tracks on the medium, distance D is at least 5/d, where d is the recording density on the medium; however, to maximize transducer efficiency, distance n is not increased significantly above 5/d. To oppose saturation of the yoke structure with applied current and enhance the efficiency of the transducer during recording, the cross-sectional area of the yoke structure is increased in the back region by progressively increasing its width rearward of the pole tip region and concurrently increasing the thickness of said magnetic layers at least about 60%. SA978036
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公开(公告)号：CA1126402A
公开(公告)日：1982-06-22
申请号：CA339625
申请日：1979-11-13
Applicant: IBM
Inventor： CHURCH MARK A , JONES ROBERT E JR
Abstract: THIN FILM MAGNETIC HEAD ASSEMBLY A thin film magnetic head assembly has a multi-turn electrical conducting coil, which is formed by deposition in an elliptical pattern. By virtue of the elliptical pattern, the coil turn portions between the back gap closure and transducing gap of the thin film head are relatively narrow, whereas the coil turn portions furthest from the transducing gap are widest. Corners and sharp ends are eliminated. Electrical resistance effects are thereby minimized and signal output is enhanced. SA978025
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Patent Agency Ranking
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公开(公告)号：CA1241111A
公开(公告)日：1988-08-23
申请号：CA503759
申请日：1986-03-11
Applicant: IBM
Inventor： JONES ROBERT E JR , LEE RODNEY E , YEH TSU-HSING
Abstract: SA984-022 A thin film magnetic transducer having a magnetic circuit having nickel-iron layers which encloses a portion of first and second windings. The portions of each winding traversing the nickel-iron layers have conductor segments equal in number and separated from each other in parallel planes. The conductor segments of each winding have a center-to-center spacing different from the remaining winding selected to avoid contact with the transition regions of the nickel-iron layers and which results in a common inductance for each winding. The windings are joined at one end to form a center tapped winding.
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公开(公告)号：CA1147855A
公开(公告)日：1983-06-07
申请号：CA339631
申请日：1979-11-13
Applicant: IBM
Inventor： JONES ROBERT E JR
Abstract: THIN FILM MAGNETIC HEAD A thin film magnetic transducer comprises a nonmagnetic substrate and a pair of magnetic pole pieces having different widths. The width of the first pole piece deposited on the substrate is greater than that of the second pole piece to prevent a problem associated with misregistration between the pole pieces, which may occur during manufacture. Such misregistration generally results in a "wraparound", so that the edge of the second pole piece would have an extended portion forming an angle to the normal magnetic transitions created by the pole pieces. The width of the second pole piece is slightly less than the effective width of the data track recorded on a magnetic medium, and the data track width is relatively independent of the dimension of the first pole piece. SA978024
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公开(公告)号：CA991828A
公开(公告)日：1976-06-29
申请号：CA159056
申请日：1972-12-13
Applicant: IBM
Inventor： SIMON PAUL , JONES ROBERT E JR
Abstract: This disclosure relates to a method for manufacturing a magnetic head. The steps of the method comprise forming a transformer having a first magnetic layer, a primary winding, a secondary winding separated from the primary winding, the primary and secondary windings being disposed on the first magnetic layer, and a second magnetic layer disposed over the primary and secondary windings. The first and second magnetic layers encircle portions of the primary and secondary windings thus forming a continuous magnetic path. Tests determinative of its magnetic properties are made on the transformer. Thereafter, the transformer is severed between the primary and the secondary windings and the secondary is discarded. The primary is then lapped to form a thin-film magnetic head.
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公开(公告)号：CA709574A
公开(公告)日：1965-05-18
申请号：CA709574D
Applicant: IBM
Inventor： REEBER MORTON D , JONES ROBERT E JR
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