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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.
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公开(公告)号：JPS6376117A
公开(公告)日：1988-04-06
申请号：JP20200287
申请日：1987-08-14
Applicant: IBM
Inventor： JIPSON VICTOR B , RUGAR DANIEL
IPC: G02F1/33 , G11B7/085 , G11B7/09 , G11B11/105
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公开(公告)号：DE69126357T2
公开(公告)日：1997-12-11
申请号：DE69126357
申请日：1991-03-11
Applicant: IBM
Inventor： GUETHNER PETER HERMANN , MAMIN HARRY JONATHON , RUGAR DANIEL
IPC: G11B9/14 , B82B3/00 , G11B9/00 , H01J37/317 , G03F1/08
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公开(公告)号：DE69016831T2
公开(公告)日：1995-08-10
申请号：DE69016831
申请日：1990-05-21
Applicant: IBM
Inventor： DEWEY ANTHONY GEORGE , LENTH WILFRIED , RUGAR DANIEL
Abstract: An apparatus and method is described for detecting focus errors in an optical head by positioning a prism (17) in the optical path of a return light beam (14) reflected from an optical recording medium (16). The prism reduces the beam in one dimension by a factor of M and concurrently increases the divergence/convergence angle associated with a focus-error of the beam by a factor of M in said dimension, thereby desirably enhancing the focus error signal (FES) by a factor of M . A focus error is detected by a segmented photodetector (19) having inner and outer photosensitive regions. The photodetector generates an electrical signal indicative of the focus error from the difference in light intensities at the inner and outer regions. The photodetector preferably is segmented in such manner as to also provide a track error signal.
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公开(公告)号：AU623778B2
公开(公告)日：1992-05-21
申请号：AU5578490
申请日：1990-05-21
Applicant: IBM
Inventor： DEWEY ANTHONY GEORGE , LENTH WILFRIED , RUGAR DANIEL
Abstract: An apparatus and method is described for detecting focus errors in an optical head by positioning a prism (17) in the optical path of a return light beam (14) reflected from an optical recording medium (16). The prism reduces the beam in one dimension by a factor of M and concurrently increases the divergence/convergence angle associated with a focus-error of the beam by a factor of M in said dimension, thereby desirably enhancing the focus error signal (FES) by a factor of M . A focus error is detected by a segmented photodetector (19) having inner and outer photosensitive regions. The photodetector generates an electrical signal indicative of the focus error from the difference in light intensities at the inner and outer regions. The photodetector preferably is segmented in such manner as to also provide a track error signal.
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Patent Agency Ranking
公开(公告)号：AU5578490A
公开(公告)日：1990-11-29
申请号：AU5578490
申请日：1990-05-21
Applicant: IBM
Inventor： DEWEY ANTHONY GEORGE , LENTH WILFRIED , RUGAR DANIEL
Abstract: An apparatus and method is described for detecting focus errors in an optical head by positioning a prism (17) in the optical path of a return light beam (14) reflected from an optical recording medium (16). The prism reduces the beam in one dimension by a factor of M and concurrently increases the divergence/convergence angle associated with a focus-error of the beam by a factor of M in said dimension, thereby desirably enhancing the focus error signal (FES) by a factor of M . A focus error is detected by a segmented photodetector (19) having inner and outer photosensitive regions. The photodetector generates an electrical signal indicative of the focus error from the difference in light intensities at the inner and outer regions. The photodetector preferably is segmented in such manner as to also provide a track error signal.
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公开(公告)号：DE69126357D1
公开(公告)日：1997-07-10
申请号：DE69126357
申请日：1991-03-11
Applicant: IBM
Inventor： GUETHNER PETER HERMANN , MAMIN HARRY JONATHON , RUGAR DANIEL
IPC: G11B9/14 , B82B3/00 , G11B9/00 , H01J37/317 , G03F1/08
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公开(公告)号：DE69016831D1
公开(公告)日：1995-03-23
申请号：DE69016831
申请日：1990-05-21
Applicant: IBM
Inventor： DEWEY ANTHONY GEORGE , LENTH WILFRIED , RUGAR DANIEL
Abstract: An apparatus and method is described for detecting focus errors in an optical head by positioning a prism (17) in the optical path of a return light beam (14) reflected from an optical recording medium (16). The prism reduces the beam in one dimension by a factor of M and concurrently increases the divergence/convergence angle associated with a focus-error of the beam by a factor of M in said dimension, thereby desirably enhancing the focus error signal (FES) by a factor of M . A focus error is detected by a segmented photodetector (19) having inner and outer photosensitive regions. The photodetector generates an electrical signal indicative of the focus error from the difference in light intensities at the inner and outer regions. The photodetector preferably is segmented in such manner as to also provide a track error signal.
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公开(公告)号：DE69001386D1
公开(公告)日：1993-05-27
申请号：DE69001386
申请日：1990-05-04
Applicant: IBM
Inventor： MAMIN HARRY JONATHON , RUGAR DANIEL
Abstract: High sensitive position sensing apparatus and method for sensing the position of a movable member (14) comprises an optical directional coupler (10) providing four external ports (a,b,c,d). Light from a short coherence length diode laser (13) is injected into the first port (a). The coupler (10) serves as a beam splitter to direct one portion of the injected light to the member (14) via the second port (b) and a single mode optical fiber (11b). Part of this one portion is reflected concurrently from the member (14) and from the adjacent polished coating at the end face of said fiber (11b) back into said fiber (11b) and optically coupled via the third port (c) to a photodetector (15) to provide a signal whose amplitude is indicative of the position of the member (14), based upon the relative phase of said concurrent reflections. The other portion of the injected light is optically coupled to and via the fourth port (d) to another photodetector (18) for roviding, as a reference, a signal proportional to the intensity of the injected light. These two signals are supplied to a subtractive circuit (21) for providing an output in which power fluctuations of the laser are minimized.
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公开(公告)号：GB2470788A
公开(公告)日：2010-12-08
申请号：GB0913555
申请日：2009-08-04
Applicant: UNIV LEIDEN , IBM
Inventor： RUGAR DANIEL , MAMIN HARRY JONATHON , OOSTERKAMP TJERK HENDRIK
IPC: G01Q60/52
Abstract: A method of magnetic resonance force microscopy for which spins are flipped of nuclei or electrons in several discrete volumes of the sample simultaneously. This is accomplished by superposition of different radiofrequency components, each one associated with a specific volume. The method relies on the proportional excitement of the resonance frequency in different hemispherical volumes having differen field strengths depending on distance from the cantilever tip.
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