Abstract: An oscillatory drive mechanism for a member to be driven comprises a flexural element (12) having a first portion (14) rigidly attached to a datum with respect to which the member is to be driven, and a second portion (15) rigidly attached to the member, the first and second portions (14,15) being interconnected by one or more first interconnecting members (17) which in the main determine the spring characteristics of the flexural element (12), and one or more second interconnecting members (18) having a dimension, generally in the direction of drive, less than the corresponding dimension of each first interconnecting member (17) and at least one of the second interconnecting members (18) having drive means (21) attached which, when energized, flexes the associated second interconnecting member, which in turn moves the second portion (15) of the flexural element relative to the first portion (14) so as to oscillate the driven member.

Abstract: A method of bonding laminations of a magnetic core is disclosed in which photo-resist material consisting of a co-polymer is applied as a film to a sheet of magnetic material to define lamination shapes to enable the laminations to be formed by etching. The film of photo-resist material on the laminations is then utilized to bond the laminations together in a stack. In order to permit the core to operate at temperatures higher than the softening temperature of the photo-resist material, the bonded stack is irradiated to cause changes to the bonding material such that the material does not soften at the operating temperature of the core.

Abstract: A process for producing magnetic elements is disclosed in which magnetic material having a low copper content is utilized and, prior to deposition of copper for acting as a non-magnetic spacer, a layer of isolating material such as nickel is deposited to isolate the copper from the magnetic material so that, after mechanical working of the magnetic material to form an element and the element is annealed to restore its initial magnetic properties, the isolating layer acts to prevent the magnetic properties of the magnetic material from being degraded by the copper layer.

Abstract: A process for the manufacture of pole structures for magnetic transducing heads is described in which the configuration of the non-magnetic gaps is formed by abrading the ferrite pole structure through a mask to erode recesses in the gap area which have inclined walls. The final dimension of the gap defining face of one or the magnetic elements is determined by removing material from the masked face of the structure until the dimension between the recesses has the desired value.

Abstract: A construction of a multi-track read and write head assembly is disclosed in which conductive shielding elements are interconnected with low resistance conductive paths by means of electrically conductive layers plated onto the shielding elements.