Abstract: A disc lacquering station, a laser beam recorder, a developing station and a metallizer are arranged in tandem. A cassette station (7) for the intermediate storage of substrates precedes and another follows the laser beam recorder. The cassette station (7) has a fixedly installed buffer magazine (9) for substrates and an extra magazine (10), removable from the apparatus, for additional substrates. In this manner substrates can be taken with the extra magazine from the cassette station preceding the laser beam recorder, recorded on a separate laser beam recorder, and then air-locked back into the production apparatus.

Abstract: In an apparatus for the laser beam exposure of a substrate disc (5), linked block tables (19, 29) are provided, which have each a piezotranslator (24, 31). This makes it possible to perform a fine correction of the movements very rapidly and very precisely.

Abstract: A vertically disposed drive spindle (5) rotates turntable (6) supporting a substrate (7) at high speed, the turntable having a smaller diameter than the substrate. Coaxial with the turntable (6), a centering ring (10) having a frustoconical inside surface can be raised vertically between a lower and upper position. The latter has on its upper side a greater diameter and on its lower side a smaller diameter than the substrate (7). In its lower position the centering ring (10) is at a distance from a substrate (7) lying on the turntable (6), but in its upper position its inside surface supports the substrate (7) at an axial distance above turntable (6).

Abstract: A plate made of silicate glass (glass master) (3) is provided with a pressing surface (surface coat) carrying the sound recording in the form of raised contours formed from a photoresist (5) with a layer of primer (adhesion promotor) (4) to hold the photoresist layer (5) to the glass plate (3). A first metal layer (6) is deposited on the photoresist (5) from a sputter target which consists of a NiV alloy; and a protective layer (7) of nickel is electrolytically deposited on the first layer. The metal master (8) consisting of first layer (6) and protective layer (7) is pulled from the photoresist layer (5).

Abstract: In an arrangement for contacting a mold with and holding it on a table, the outer edge of the mold is to be screened from undesired growths by electrodeposition through the use of an elastic collar which embraces the table, while holding and contacting the mold in a reliable manner. This object is achieved in that the table comprises a contact plate which together with the table and the mold forms an annular space for a radial annular flange of the collar, and in that the outer flange is stretched around the table in such a manner that further holding members of the collar urge the mold onto the contact plate through its annular circumferential surface.

Abstract: In a method of manufacturing a mould and providing it with a backing, the mould is derived from a parent information carrier by an electroforming process, after which electroforming process and prior to its separation from the parent information carrier the mould is provided with a backing. In order to reduce the cycle times and to improve the mechanical stability, the backing is formed by a UV-curable lacquer which is applied in liquid form and is distributed over the back of the mould, which is subsequently cured by exposure to ultraviolet light.

Abstract: In a method of marking optically readable disc-shaped information carriers which are manufactured, for example, by a transfer-moulding process using at least one mould serving as a stamper, which mould has been derived from a master via at least two electroforming replication steps, the mould is provided with a marking for the subsequent indentification of the mould, which marking is situated in an otherwise information-free area of the information carrier to be manufactured and allows the mould thus marked to be identified.

Abstract: The invention relates to disc-shaped information carriers which can be read optically in reflection and which contain an annular information zone which is bounded by a concentric inner zone and a concentric outer zone. The information carrier consists of a transparent substrate and has a readout side and opposite side (back) which at least in the information zone has a reflective coating. The light entering the outer zone from the readout side is reflected at least partially diffusely or absorbed by the information carrier. In this way, manufacturing defects such as, for example, inclusions, inhomogeneities etc. are at least partially masked or concealed.

Abstract: The invention relates to a method of replenishing and/or preparing water-displacing treating liquids or mixtures of these treating liquids and of water-absorbing liquids. Said liquids are contained in treating compartments and are used to remove water which adheres to the surface of objects immersed in the treating liquids. The objects may consist of, for example, glass, ceramic, nickel, copper, stainless steel or synthetic resin such as, for example, disc-shaped information carriers.

Abstract: The invention relates to disc-shaped information carriers which can be read optically in reflection and which contain an annular information zone which is bounded by a concentric inner zone and a concentric outer zone. The information carrier consists of a transparent substrate and has a readout side and an opposite side (back) which at least in the information zone has a reflective coating. The light entering the outer zone from the readout side is reflected at least partially diffusely or absorbed by the information carrier. In this way, manufacturing defects such as, for example, inclusions, inhomogeneities etc. are at least partially masked or concealed.

Abstract: A method for manufacturing high information density storage disks, suitable for optical reading, out of transparent synthetics having a high glass temperature and high dimensional stability. The present injection molding method avoids potential double diffraction disruptive effects created by frictional or shearing forces. The synthetic material which is to be pressed is injected into one of the mold halves at a temperature that significantly exceeds the pressing temperature of the compression form and is injected so as to form a lump of the material. The pressing step wherein the compression form is closed down to a squeezing gap width is initiated prior to the termination of the injection operation. Likewise the cooling operation is initiated prior to the termination of the pressing step and both the cooling and pressing operations chronologically proceed at approximately an exponential rate.

Abstract: An anode case is immersed within a deposition cell of a galvanic bath and is supported on an electrically conducting guide or support bar arrangement via a perforated contact plate which extends over the entire length of the anode case and is welded on in the vicinity of the feed opening of the anode case. The anode case is also covered by an anode enclosure which is not permeable to an anode slurry. The enclosure is slid into position in the vicinity of the contact plate in the slot between the contact plate and the anode case.