Ted Bildplatten Aktiengesellschaft, Aeg-telefunken, Teldec

Dmm Master Technik Gmbh Fur Informationstrager

Gunter Joschko

Horst Redlich

Peter Albrecht

Karl-Ekkehard Schriefl

An arrangement for the recording of a digital information signal, in particular onto a plate-shaped, metallic recording carrier with the aid of a penetrating element is specified, in which the latter preferably has a pyramid shape with three side surfaces and three edges. The edge (6) forming the runner of the penetrating element lies, in its projection onto the recording carrier, in the direction of the velocity vector at the point of recording. The edge forms with the velocity vector an angle of &gt;135.degree.. The projections of the two further edges onto the recording carrier lie perpendicular to the velocity vector. With the aid of such a penetrating element, an engraving of a digital signal is possible, which is read out by a laser beam.

Arrangement for the recording of an information signal

A method for producing a prerecorded disk-shaped die is specified in which the information signal is recorded onto a metallic recording medium. According to the invention, the information carrier layer consisting of base metal is first vapor-deposited onto a glass base. Then the information signal is recorded onto the surface of the information layer with the aid of a cutting or stamping tool. Following this, a metallic interlayer of precious metal is galvanized on, onto which another base layer particularly of metal, is then galvanized. After the glass base has been mechanically separated, the information carrier layer can then simply be removed by a chemical medium which does not attack the interlayer. The method according to the invention is particularly suitable for producing dies for digital sound recording according to the compact disk process.

Method for producing a prerecorded disk-shaped die

A process is provided for producing a grinding agent carrier comprised of a carrier body and a layer of grinding agent on the surface of the carrier body. The grinding agent layer is initially produced on a planar substrate by sedimentation from a suspension comprised of a suspension medium and grinding agent, and the grinding agent layer is then transferred from the substrate and bonded to the carrier body. The substrate is maintained in a horizontal position and the sedimentation is effected on the horizontal substrate from a liquid column of the suspension wherein the liquid column has a height in millimeters which is at most around 0.4 times the square root of the width in millimeters of the liquid column.

Method for producing a grinding agent carrier

In order to effect repeated reworking of a body, whose tip, during use, engages a record carrier track to guide a playback or recording member along the track, the reworking involving subjecting the body to successive reworking operations after successive periods of use, the tip of the body being worn down to a certain extent during each period of use and material being removed from the tip to restore its original shape during each reworking operation, the useful life of the body is effectively increased by adjusting the maximum removal depth occurring during each successive reworking operation as a function of the depth to which the tip is worn during the corresponding preceding period of use.

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Berlin, Germany

Gunter Joschko