Wangtek

Hamid Baheri

Jefferson H Harman

Daniel L Griffith

Peter Campbell

A magnetic recording head positioning system includes a Terfenol-D magnetostrictive rod prestressed by a lever arm to operate in a linear range to microposition the magnetic recording head in accordance with an electromagnetic field. The mechanical advantage of the lever arm amplifies changes in the magnetostrictive rod to position the head. The varying electromagnetic field is applied to the rod by a coil in response to a position error signal produced from servo data tracks on the magnetic tape. A permanent magnet system biases the magnetostrictive element with a DC field so that varying the field provides bi-directional motion of the magnetic recording head. The DC field also reduces coil current and size requirements. The position signal is filtered so that changes in length of the magnetostrictive rod provide fast, fine positioning of the head while a stepper motor and lead screw subassembly system provide slow, coarse positioning of the magnetic recording head by moving the magnetostrictive element assembly in an open loop and/or closed or servo loop mode.

Servo controlled magnetic head positioner

An adjustable head mounting system for a magnetic recording device. The head mounting system includes a head tray for receiving a magnetic head and a bracket. The head tray is formed of a resilient material and has a first portion for receiving the head, a second portion intersecting the first portion along a first joining line, and a third portion intersecting the second portion along a second joining line. The three portions of the head tray each have a substantially planar surface and an adjustable coupling device to connect the surface to the bracket. The orientation and position of the head can be adjusted by adjusting the coupling device to pivot the head about the joining lines.

Adjustable magnetic head mounting system

A magnetic head positioning system operates with a lead screw stepper motor assembly and a recording or reading head. The lead screw of the lead screw stepper motor assembly extends through and coaxially with a hollow cylindrical tube. Two slots are provided through the peripheral wall of the tube and extend from one end of the tube towards the second end. A floating nut is shaped to be placed on the lead screw so as to move in a first and second direction as the lead screw is moved in a first and second direction by the motor assembly. The floating nut is provided with two outwardly extending wings, each shaped to fit in one of the slots provided in the tube. A carriage assembly is secured to the head and includes a tubular structure having an inside diameter larger than the outside diameter of the slotted tube. The tubular structure also includes two slots extending from one end toward a second end of the structure. The tubular structure is placed over the slotted tube, floating nut, and lead screw with the wings of the floating nut extending through the slots and with the closed ends of the slots resting against the wings of the floating nut to maintain the head position in dependence upon the position of the lead screw. As the lead screw is moved parallel to the axis of the slotted tube, such movement is transferred to the head.

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Sherman Oaks, CA, United States of America

Hamid Baheri