Magnetic head adjustment mechanism

Claim 1

Memory apparatus supported by a base for use in a digital computer system comprising in synergistic combination: at least one spinable rigid magnetic disc for recording digital information; magnetic head means for reading said information from and writing said information into said disc; positioning means for accurately positioning said magnetic head means parallel and adjacent to the plane of said disc; said positioning means including supporting means movably mounted on said base and movable in directions parallel to and perpendicular to the plane of said disc for supporting said magnetic head means, and shim means for displacing and supporting means in the direction perpendicular to the plane of said disc to accurately adjust the adjacent relationship between said magnetic head mean and said disc; motor means including a spinable shaft for driving said disc about its spin axis; a transducer system for measuring angular displacement of said spinable disc from a reference fixed to said base, said transducer system commprising: a transducer-related disc having means for communicating with said transducer mounted on said transducer-related disc, said transducer-related disc being mounted on said shaft and spinable therewith; a transducer having transmitting and receiving devices, and oriented to permit passage of said transducer-related disc between said devices to alternately permit and prevent communication between said devices; and an upright member for supporting said transducer, said upright member including a base lip for connection to said base, said base and said base lip having keying means for constraining the mounting of said transducer system to said base to a predetermined orientation, whereby said transducer-related disc is constrained to pass between said optical devices.