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公开(公告)号：DE3578017D1
公开(公告)日：1990-07-05
申请号：DE3578017
申请日：1985-11-19
Applicant: IBM
Abstract: The method involves the steps of lowering the magnetic head (8) to within aerodynamic distance from the surface (16) of a moving recording medium, enforced further lowering of the head (8) until a tunnel current occurs across the gap between head (8) and surface (16), and maintaining said tunnel current constant by using the deviations of the current from a predetermined value (which corresponds to a certain flying height).The apparatus comprises a tunnel electrode (9) forming an integral part of the head assembly which is attached to a distance control mechanism (5) permitting the positioning of the head assembly with a one-nanometer accuracy. The tunnel electrode (9) has a very slightly beveled shoulder (45, 47) ensuring early detection of asperities approaching the head while sitting on the surface (16) of the moving recording medium (3). Gradation of the potential between tunnel electrode (9) and surface (16) of the recording medium (3) is used to enhance the response to asperities.
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Patent Agency Ranking
公开(公告)号：DE69223789D1
公开(公告)日：1998-02-05
申请号：DE69223789
申请日：1992-10-22
Applicant: IBM
Inventor： COURJON DANIEL DR , POHL WOLFGANG DIETER DR
IPC: G01B11/30 , G01N37/00 , G01Q30/12 , G01Q60/18 , G01Q60/20 , G01Q60/22 , G02B21/00 , G11B7/12 , G02B6/28 , G11B11/00 , G11B9/00
Abstract: This scanning near-field optical microscope is of the type where a light beam (19) with a diameter of at maximum lambda /20 is emitted, or received, by a sharply pointed probe tip (13) which is scanned across the surface of a sample (11) to be investigated. The light reflected by, and/or transmitted through, the sample (11) is detected by a detector (16) and/or further processed by a computer (24). The distance between the light-emitting probe tip (13) and the sample (11) under investigation is on the order of lambda /20 as well, so that the surface of the sample (11) is within the near-field of said probe tip (13). This optical microscope is characterized in that the gap between the probe tip (13) and the sample (11) is filled with a liquid (40) of high opacity, including any liquids with a large negative dielectric constant epsilon , so as to attenuate the intensity of the lightwaves emitted or received by the probe tip (13) to such an extent that the penetration depth z0 of the lightwaves inside the liquid, defined as the distance over which their intensity decreases to 1/e, is below 100 nm.
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公开(公告)号：DE69220951D1
公开(公告)日：1997-08-21
申请号：DE69220951
申请日：1992-10-22
Applicant: IBM
Inventor： POHL WOLFGANG DIETER DR
Abstract: The near-field photon tunneling devices consist of a plurality of optical waveguides, such as optical fibers (1, 2), arranged in juxtaposition with a variable tunnel gap (13) through which photons from at least one of said optical fibers (1, 2) can be caused to tunnel, and wherein the said tunnel gap (13) is filled with a metal (16) that is liquid at room temperature or at moderately elevated temperature. The width of the tunnel gap (13), -and with it the thickness of the liquid metal layer- is remotely controllable. The proposed control mechanisms include optical means, piezo-electric elements (8) and temperature- sensitive means. The devices proposed include optical couplers of the head-on and side-on types, optical modulators and switches, as well as display units.
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公开(公告)号：DE3477271D1
公开(公告)日：1989-04-20
申请号：DE3477271
申请日：1984-12-28
Applicant: IBM
Abstract: The waveguide comprises a transparent body (13) having a very sharp point at one end and being coated with a first opaque layer (14) such as metal. Said opaque layer (14) carries a layer (15) of an optically transparent material which, in turn, is covered by a second opaque layer (16). The apex of the point is removed so as to expose said transparent body (13) in a first aperture (18) and to expose said transparent layer (15) in a second aperture 17, said first aperture occupying an area below 0,01µm 2 .Light entering the transparent body (13) from its remote end is shone onto an object (4), the reflected light enters said second aperture (17) and is guided to a light detector (19) for further processing.
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公开(公告)号：DE3474380D1
公开(公告)日：1988-11-03
申请号：DE3474380
申请日：1984-05-03
Applicant: IBM
Inventor： BEDNORZ JOHANNES GEORG DR , LANZ MARTIN ALFRED , NIEVERGELT HERMANN , POHL WOLFGANG DIETER DR
Abstract: The piezoelectric bimorph (4) is supported on a block (3) pivoted by gudgeon pins (2). The electrodes of the bimorph are energised so as to lift an end orthogonally to its long axis. The object to be inspected or tool or electrode (7), to be moved, is clamped to the bimorph by a shoe (6). When no potential is applied to two further bimorphs (10,11), their respective clamps (14,15,16,17) rest against a block (3), and the shoe respectively. For a given energisation the clamps (15,17) are freed from the shoe allowing the first bimorph, when energised, to bend upwards. Now, if the potential is removed from the second and third bimorphs, the clamps (15,17) clamp the raised shoe.
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