Abstract: In a novel method in the field of the production of discharge vessels, in particular for silent flat radiators, an exhaust tube 3 for evacuating and filling is inserted into an opening 2 in the discharge vessel, it being possible in a simple way by means of an adapter 4 to achieve optimum fitting and sealing between a square inner cross section of the opening 2 and a round outer cross section of the exhaust tube 3.

Abstract: A gas discharge lamp having a discharge vessel, for example composed of a base plate, front plate (2) and frame (3), has at least one closure element (6) which closes a discharge vessel opening in a gas-tight fashion by virtue of the fact that the closure element (6) was inserted into the discharge vessel opening and subsequently fused. The closure element (6) consists of a material which is low-melting by comparison with the remainder of the discharge vessel, for example sintered glass. It is possible to dispense with an additional connecting means between the closure element (6) and the adjacent wall of the discharge vessel (2).

Abstract: A discharge lamp, suitable for operating by means of a dielectrically impeded discharge, and having metal electrodes arranged on the wall of the discharge vessel has at least one dielectric impeding layer which covers at least a portion of the electrodes. According to the invention, the electrodes are additionally covered directly with a barrier layer, in particular made from sintered glass ceramic, that is to say the barrier layer is, if appropriate, respectively arranged between the electrode and the dielectric impeding layer. The result of this is to prevent metal ions from diffusing out of the electrodes into the dielectric impeding layer and undesirably influencing the properties thereof. Moreover, it is possible in this way to prevent the electrode tracks from evaporating or being sputtered away during operation of the lamp.

Abstract: The invention relates to a flat illumination device (1), comprising a base plate and a front plate which are connected to form an at least partially transparent vessel which, in its interior, has an ionizable fill. In a partial region of the vessel, at least one of the two plates is at least in part provided with a mirror surface. An unmirrored partial region (12) of the vessel is designed to realize an illumination function.

Abstract: A discharge lamp, suitable for operation by means of dielectrically impeded discharge, having electrodes arranged on the wall of the discharge vessel, has at least one dielectric layer which covers at least a part of the electrodes and, optionally, the discharge vessel wall as well. A phosphor and/or reflective layer is arranged on the at least one dielectric layer. According to the invention, at least the dielectric layer arranged directly underneath the phosphor or reflective layer consists of a glass solder whose viscosity variation as a function of temperature is irreversible, in particular of a sintered glass ceramic. This prevents this layer from re-melting during the fabrication process and thereby tearing the overlying porous reflective and/or phosphor layers.

Abstract: The invention relates to a method of contactlessly ascertaining chatter marks in finely-machined workpiece surfaces, with the following steps: a contactlessly operating, high-resolution surface-measuring method is used to generate from the workpiece surface a data record representing the actual microtopography of the workpiece surface, to take away from this a data record representing the idealized macroform of the workpiece surface, and in this way to generate a data record representing the flat-extended form of the microtopography of the workpiece surface. This data record is subjected to a digital in-phase bandpass filtering with respect to its circumferential waviness, the waviness of interest here of the chatter marks preferably being allowed through. The data record formed in this way is for its part subjected to a stationary multiple cross correlation with respect to the transverse direction.

Abstract: A fluorescent lamp, in particular for the backlighting of liquid crystal display screens, having a discharge vessel with a gas filling, the discharge vessel having a fluorescent layer and an electrode structure for a dielectric impeded discharge, the electrode structure fixing a geometric distribution of partial discharges and the fluorescent layer having a thickness variation in accordance to the geometrical distribution of the partial discharges.

Abstract: A process for grinding a cylindrical journal is provided, in which the workpiece is rotationally drivably received and held in a work spindle. The grinding disk, which is cylindrically trimmed on its outer circumference, is brought into engagement with the journal to be ground. In order to be able to avoid twist structures during the cylindrical grinding, or at least to keep them within tolerable limits, while approaching the desired circumferential speed of the grinding disk and that of the workpiece within a respectively permissible spread, the rotational disk speed under a load during the grinding and/or the rotational workpiece speed under a load is/are continuously changed during each grinding operation and/or adjusted such that the ratio of the rotational disk speed to the rotational workpiece speed is disharmonic to as high a degree as possible; that is, that integral or simple fractional ratios of the disk rotational speed to the workpiece rotational speed are avoided.

Abstract: A method for determining a torsional structure in the surface roughness of a finished shaft journal includes making a plurality of axial scores on a circumferential strip of the shaft journal, with a high axial measurement point density at different but exactly known circumferential positions as well as with exactly known axial positions. The individual local roughness profiles are printed out in a close sequence with respect to one another corresponding to their positions. The measurement charts are raised or elongated in the radial and axial directions and upset in the circumferential direction. Thus, a topography with multidimensional affinity showing the microstructure of the surface in three dimensions in a diagonal view is obtained. An autocorrelation function is formed from this topography, stochastic elements are eliminated, and a surface topography is obtained that essentially contains only the periodic elements.

Abstract: A process for the production of nitrides for ceramic materials, in particr ALN, is described in which the element to be converted to the nitride is anodically oxidized. This oxidation is carried out in the presence of a nitrogen compound which can be reduced under the electrolysis conditions and of a substance which increases the conductivity. The electrolysis is followed, if necessary, by removal of volatile constituents and calcination of the product.