摘要:
Multi-layer magnetic thin film disks comprising a synthetic resin layer on an aluminum-containing substrate and an overlying metallic magnetic layer, are liable to have pin holes in the synthetic resin layer caused by galvanic corrosion of the aluminum in the substrate. The pin holes are passivated by aluminum oxide produced therein by anodically oxidizing the aluminum of the substrate in an electrolytic bath, the electric voltage of which is well below the normal passivation voltage for aluminum.
摘要:
A method and apparatus is provided for characterizing magnetic coating compositions that contain magnetic particles dispersed in a solvent resin matrix. The coating composition, as it passes through a tube, is subjected to an alternating magnetic field and perpendicular thereto a constant magnetic field of appropriate field strength and duration. Via a measuring coil surrounding the tube the induced signal in the composition is monitored and the degree of dispersion, is measured by measuring the magnetic susceptibility of the coating material. By applying a constant magnetic field the degree of dispersion cna be changed at least for a certain time. The method and apparatus of the present invention can be incorporated into a coating apparatus to monitor and improve the magnetic characteristics of the coating material being applied to a substrate.
摘要:
Grooved substrates and multilayer structures, especially suitable for optical disks, are taught. The major process steps include spin coating of a supporting plate with dissolved material forming a soft layer thereon, stamping grooves into the soft layer to form a structured soft layer showing the negative image of the stamp and hardening the structured soft layer by thermal treatment. The dissolved material contains polymeric organometal compounds comprising polymer siloxane and/or polymer silicates. In one embodiment the structured soft layer is a dielectric layer containing various combinations of the oxides SiO.sub.2, La.sub.2 O.sub.3, PbO and TiO.sub.2. The multilayer structure completed by a magneto-optic layer, a reflector layer and a passivation layer.
摘要翻译:教导了特别适用于光盘的凹槽基板和多层结构。 主要工艺步骤包括在其上形成软层的溶解材料的支撑板的旋涂,将软质层压入软层中以形成显示印模的负像的结构化软层,并通过热处理硬化结构化软层。 溶解的材料含有包含聚合物硅氧烷和/或聚合物硅酸盐的聚合物有机金属化合物。 在一个实施例中,结构化软层是包含氧化物SiO 2,La 2 O 3,PbO和TiO 2的各种组合的介电层。 由磁光层,反射层和钝化层完成的多层结构。
摘要:
An optical storage disk consists of a glass substrate (1) into which guide tracks (3) for servo-controlling the focussed light beams are directly stamped by a hot stamp process. After stamping, the glass substrate is thermally quenched in the stamping device to increase its breaking resistance through thermal curing. In order to achieve uniform guide tracks over the entire surface of an optical storage disk, flexible stamp stencils (35) in a flexible holder (34) are used whose curvature can be changed by applying hydro-static pressure. Suitable stamp stencils consist of monocristalline silicon disks with surface hardening, or of metal disks, structured in photolithographic processes. The stamp lands are made with bevelled edges to facilitate the separating of stamp and glass substrate after cooling.
摘要:
An optical storage disk includes a glass substrate (1) into which guide tracks (3) for servo-controlling the focussed light beams are directly stamped in by hot stamp process. After stamping, the glass substrate is thermally quenched in the stamping device to increase its breaking resistance through thermal curing. In order to achieve uniform guide tracks over the entire surface of an optical storage disk, flexible stamp stencils (35) in a flexible holder (34) are used whose curvature can be changed by applying hydro-static pressure. Suitable stamp stencils include monocristalline silicon disks with surface hardening, or of metal disks, structured photolithographic processes. The stamp lands are made with bevelled edges to facilitate the separating of stamp and glass substrate after cooling.
摘要:
The magnetic disk contains on a disk substrate a magnetic layer comprising a binder, magnetic particles and abrasion-resistant particles, the abrasion-resistant particles being enveloped with a layer intensifying the bond between binder and abrasion-resistant particles. The enveloping layer either has a large specific surface and consists e.g. of SiO.sub.2 /Al.sub.2 O.sub.3 produced by processing the particles with an alkali metal silicate solution and an aluminum sulphate solution, or it is chemically bonded to the binder by enveloping the particles with poly(tetrafluroethylene) and coupling the latter, via an amino bridge to the binder, e.g. an epoxide resin.The magnetic disk according to the invention minimizes the abrasion of the magnetic layer as well as the damaging of the magnetic layer and of the magnetic head by knocked-out abrasion-resistant particles.
摘要翻译:磁盘在磁盘基板上包含包含粘合剂,磁性颗粒和耐磨颗粒的磁性层,耐磨颗粒被包裹着增强粘合剂和耐磨颗粒之间的粘结的层。 包络层具有大的比表面积, 通过用碱金属硅酸盐溶液和硫酸铝溶液处理颗粒而制备的SiO 2 / Al 2 O 3,或者通过用聚(四氟乙烯)包封颗粒并将其与氨基桥连接到粘合剂上而与粘合剂化学键合 ,例如 环氧树脂。 根据本发明的磁盘使得磁性层的磨损以及被破坏的耐磨颗粒对磁性层和磁头的损害最小化。
摘要:
For characterizing coating compositions with magnetic particles the coating composition is subjected to an alternating magnetic field of variable frequency. The field induced by the coating composition after energization is recorded, and thus the susceptibility of the coating composition is measured. Depending on the variable frequency, conclusions can be made regarding the degree of dispersion, particle density, and viscosity of the coating composition. The variable frequency is between 1 and 100 cps, and the field intensity of the energizing field should be lower than 10 Oerstedt. The coating composition is fluid or stagnant in a pipe *1, 11 which is surrounded by field coil and measuring coil.
摘要:
A micromechanical pressure sensor and a method for producing a micromechanical pressure sensor. This pressure sensor has at least one membrane and a measuring element situated on the membrane. A pressure applied at the membrane or a pressure differential applied at the different sides of the membrane results in deformation of the membrane. Simultaneous with the deformation of the membrane, the measuring element is subjected to elastic elongation and/or compression. In a piezo-sensitive component, such elastic elongation and/or compression generates a measured variable in the measuring element, which represents the applied pressure or the applied pressure differential at the membrane. It is provided in this context that the measuring element have at least partially a NiCr(Si) layer. Due to an at least partial crystallization in the production of the micromechanical pressure sensor, this NiCr(Si) layer has more advantageous piezoelectrical characteristics than an amorphous NiCr(Si) layer.
摘要:
Disclosed is a method for determining relevant objects in the vicinity of a motor vehicle by an environmental detection sensor. A calculation of the probable trajectory of objects is thus not necessary. The only objects that are classified as relevant are those with a greater probability of a collision despite an average driver response such as evasive action and/or braking. The probability of a collision is determined in accordance with at least two values that are calculated from vehicle and environmental data. A first value describes future evasive action or evasive action that has already been initiated and a second value describes a deceleration operation. Each of the two or more values is delimited by a threshold value, which indicates the start of a critical range. The braking devices are activated if at least one of the determined values lies in the critical range.
摘要:
A process for the decontamination of materials such as soil, sediments and sludges contaminated with organic contaminants such as PCB's. The process comprises the steps of separating the material into a solid fraction and a liquid fraction when liquid is present leaching the solid fraction with a leaching solvent to obtain contaminated leaching solvent and a mixture of decontaminated solids and leaching solvent and stripping the contaminant, from the contaminated leaching solvent with a stripping solvent to concentrate the contaminants. When liquid is present in the material, adsorbing residual contaminants from the liquid fraction are adsorbed onto decomtaminated solids to produce decontaminated liquids and contaminated solids.