-
Patent Agency Ranking
公开(公告)号：JPH10320855A
公开(公告)日：1998-12-04
申请号：JP7470498
申请日：1998-03-23
Applicant: IBM
Inventor： RUGAR DANIEL , TERRIS BRUCE DAVID
Abstract: PROBLEM TO BE SOLVED: To provide an AFM(Atomic Force Microscope) data storage system equipped with a tracking servo system, which is capable of maintaining a stylus on a track in a very small distance. SOLUTION: Groups of three timing or tracking lines 70, 71 and 72 are formed, groups 50, 51, 52 and 53 are separated from one another in the circumferential direction of a disk 10, and surface irregular parts for forming machine readable information are dispersed. Data tracks 60, 61 and 62 and the groups of tracking lines separated in the circumferential direction are grouped in zones separated on a disk in its radial direction. The tracking lines 70 and 72 are non-radial lines. By using another group of in identification mark 80 related to each data zone, a timing gate possible for detecting tracking lines is started. By using comparison between time for tracking line detection interval and specified target time, an actuator is controlled.
-
公开(公告)号：DE69802451T2
公开(公告)日：2002-06-13
申请号：DE69802451
申请日：1998-02-16
Applicant: IBM
Inventor： RUGER DANIEL , TERRIS BRUCE DAVID
Abstract: A high density data storage system based on atomic force microscopy uses a tracking servo system based on timing or tracking lines (70,71,72) placed on the data storage medium. In a disk drive embodiment with a read-only disk (10), the timing or tracking lines are formed in sets of triplets with the sets being circumferentially spaced around the disk (10) and interspersed with the surface incongruences (12) that form the machine-readable data features. The data tracks (60,61,62) and circumferentially-spaced sets of tracking lines are grouped into radially-spaced bands on the disk. Each set of tracking lines includes at least two lines, one of which (70) is a nonradial line. A separate set of identification (ID) marks associated with each data band are used to initiate a timing gate during which the tracking lines are expected to be detected. A comparison of the time between the detection of at least two of the lines with a predetermined target time is used to generate a tracking error signal (TES) that is used to control the actuator (22) and move the stylus (19) back on track or to the desired track.
-
公开(公告)号：AU6049301A
公开(公告)日：2002-01-02
申请号：AU6049301
申请日：2001-06-01
Applicant: IBM
Inventor： TERRIS BRUCE DAVID , WELLER DIETER KLAUS
Abstract: A magnetic recording disk is patterned into discrete magnetic and nonmagnetic regions with the magnetic regions serving as the magnetic recording data bits. The magnetic recording layer comprises two ferromagnetic films separated by a nonferromagnetic spacer film. The spacer film material composition and thickness is selected such that the first and second ferromagnetic films are antiferromagnetically coupled across the spacer film. After this magnetic recording layer has been formed on the disk substrate, ions are irradiated onto it through a patterned mask. The ions disrupt the spacer film and thereby destroy the antiferromagnetic coupling between the two ferromagnetic films. As a result, in the regions of the magnetic recording layer that are ion-irradiated the first and second ferromagnetic films are essentially ferromagnetically coupled so that the magnetic moments from the ferromagnetic films are parallel and produce a magnetic moment that is essentially the sum of the moments from the two films. In the non-irradiated regions of the magnetic recording layer, the first and second ferromagnetic films remain antiferromagnetically coupled so that their magnetic moments are oriented antiparallel. The composition and thicknesses of the first and second ferromagnetic films are selected such that essentially no magnetic field is detectable at a predetermined distance above the magnetic recording layer corresponding to the height that the magnetic recording head would be located.
-
公开(公告)号：DE69802451D1
公开(公告)日：2001-12-20
申请号：DE69802451
申请日：1998-02-16
Applicant: IBM
Inventor： RUGER DANIEL , TERRIS BRUCE DAVID
Abstract: A high density data storage system based on atomic force microscopy uses a tracking servo system based on timing or tracking lines (70,71,72) placed on the data storage medium. In a disk drive embodiment with a read-only disk (10), the timing or tracking lines are formed in sets of triplets with the sets being circumferentially spaced around the disk (10) and interspersed with the surface incongruences (12) that form the machine-readable data features. The data tracks (60,61,62) and circumferentially-spaced sets of tracking lines are grouped into radially-spaced bands on the disk. Each set of tracking lines includes at least two lines, one of which (70) is a nonradial line. A separate set of identification (ID) marks associated with each data band are used to initiate a timing gate during which the tracking lines are expected to be detected. A comparison of the time between the detection of at least two of the lines with a predetermined target time is used to generate a tracking error signal (TES) that is used to control the actuator (22) and move the stylus (19) back on track or to the desired track.
-
公开(公告)号：CA2392487A1
公开(公告)日：2001-12-27
申请号：CA2392487
申请日：2001-06-01
Applicant: IBM
Inventor： WELLER DIETER KLAUS , TERRIS BRUCE DAVID , FULLERTON ERIC EDWARD
Abstract: A magnetic recording disk is patterned into discrete magnetic and nonmagneti c regions with the magnetic regions serving as the magnetic recording data bit s. The magnetic recording layer (20) comprises two ferromagnetic films (22, 24) separated by a nonferromagnetic spacer film (26). The spacer film (26) material composition and thickness is selected such that the first and secon d ferromagnetic films (22, 24) are antiferromagnetically coupled across the spacer film (26). After this magnetic recording layer (20) has been formed o n the disk substrate (11), ions (62) are irradiated onto it through a patterne d mask (60). The ions disrupt the spacer film (62) and thereby destroy the antiferromagnetic coupling between the two ferromagnetic films (22, 24). As a result, in the regions (55) of the magnetic recording layer (20) that are io n- irradiated the first and second ferromagnetic films (22, 24) are essentially ferromagnetically coupled so that the magnetic moments from the ferromagneti c films (22, 24) are parallel and produce a magnetic moment that is essentiall y the sum of the moments from the two films (22, 24). In the non-irradiated regions (52, 54) of the magnetic recording layer (20), the first and second ferromagnetic films (22, 24) remain antiferromagnetically coupled so that their magnetic moments are oriented antiparallel. The composition and thicknesses of the first and second ferromagnetic films (22, 24) are selecte d such that essentially no magnetic field is detectable at a predetermined distance above the magnetic recording layer (20) corresponding to the height that the magnetic recording head would be located.
-
-
-
-
Search Results
5
records
(took 0.016 seconds)
