公开(公告)号：CA1290054C

公开(公告)日：1991-10-01

申请号：CA519019

申请日：1986-09-24

Applicant: IBM

Inventor： POHL WOLFGANG D ,  GIMZEWSKI JAMES K ,  MURALT PAUL R

IPC: G11B5/60 ,  G11B21/21

Abstract: SZ 9-85-01C Method and Apparatus for Controlling the Flying Height of the Head in a Magnetic Storage Unit 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.

公开(公告)号：ES2003495A6

公开(公告)日：1988-11-01

申请号：ES8602974

申请日：1986-11-11

Applicant: IBM

Inventor： POHL WOLFGANG D ,  GIMZEWSKI JAMES K ,  MURALT PAUL R

IPC: G11B5/60 ,  G11B21/21

Abstract: METODO Y APARATO PARA CONTROLAR LA ALTURA DE FLOTACION DE UNA CABEZA MAGNETICA SOBRE UN MEDIO DE REGISTRO MOVIL, EN DONDE EL METODO IMPLICA BAJAR DICHA CABEZA HASTA LA DISTANCIA AERODINAMICA DE LA SUPERFICIE (16) DE DICHO MEDIO DE REGISTRO, BAJAR MAS DICHA CABEZA HASTA PRODUCIR UNA CORRIENTE TUNEL ENTRE ELLA Y DICHA SUPERFICIE, Y MANTENER CONSTANTE DICHA CORRIENTE UTILIZANDO SUS DESVIACIONES RESPECTO DE UN VALOR PREDETERMINADO. EL APARATO COMPRENDE UN ELECTRODO YUNEL (9) FIJADO A UN MECANISMO (5) DE CONTROL DE DISTANCIA Y DOTADO DE UN ASIENTO (45, 47) BISELADO PARA DETECTAR ANTICIPADAMENTE ASPEREZAS QUE SE APROXIMAN A LA CABEZA AL ASENTARSE SOBRE LA SUPERFICIE (16) DEL MEDIO DE REGISTRO (3). EL INVENTO ES APLICABLE A LAS UNIDADES DE MEMORIA MAGNETICA DE ALMACENAMIENTO DE DATOS.