U.S. Philips Corporation

Theodorus C Bertens

Jan T Gerkema

Gerrit J Koel

Hendricus F Van Tongeren

Martinus M Sens

Johannes T Thijssen

Hendrikus Josephus Van Dijk

A laminated product comprising substrate (7) and a thin layer (11, 12) of a dielectric compound formed from the oxide or the suboxide of gallium antimonide or indium antimonide, an optical information carrier containing such a thin layer, whereby said thin layer, dependent upon the oxygen content, may function as a recording layer 11 or as a transparent distance layer 12, as well as the suboxide of gallium antimonide or indium antimonide used in the laminated product.

Laminated product, compound used in the laminated product and optical

A compressed dispenser cathode having 1-15% by weight of Ba.sub.2 Sc.sub.2 O.sub.5 in a porous metal cathode body has an emission having a larger current density (exceeding 6 A/cm.sup.2) and a longer life (more than 3000 hours).

Dispenser cathode

A method of manufacturing a magnetic head wherein a pattern is formed in a nickel-iron layer by means of a photo-etching process. The nickel-iron layer is provided with an auxiliary layer of titanium, titanium oxide or silicon oxide and with a photolacquer layer in a pattern which corresponds to the pattern desired in the nickel-iron layer. The lacquer layer pattern does not cover a part of the auxiliary layer and serves as an etching mask for the simultaneous etching of the auxiliary layer and the nickel-iron layer.

Method of manufacturing a magnetic head by photo-etching

The invention relates to a method of manufacturing a device, for example, a magnetic head for recording and playing back information on a magnetisable medium. In this method, a substrate of semiconductor material is profiled by a selective electrolytic etching process. Preceding the etching process, the part of the substrate to be removed by said process is formed by a local doping treatment, for example, by diffusion. The doping treatment may be carried out in several overlapping steps.

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Eindhoven, Netherlands

Theodorus C Bertens