Abstract: A video disc comprises a grooved disc having video information in the form of a surface relief pattern within the groove, the disc made from a plastic material containing finely divided conductive particles such that the bulk resistivity at 900 MHz is less than 500 ohm-centimeters.

Abstract: High-density information records are lubricated with a methyl alkyl siloxane lubricant containing an effective amount of a donor-acceptor complex to reduce moisture sensitivity.

Abstract: A method of producing a high frequency III-V FET and the resultant structure is described wherein a doped layer is formed on a wafer of undoped, semi-insulating III-V material. The structure is then etched to form a mesa after which, a channel region is regrown from an exposed portion of the III-V substrate. The formation of the channel region defines the source and drain regions. Ohmic contacts are then made to the source and drain regions after which a Schottky contact is made to the channel region.

Abstract: A photovoltaic array comprises a continuous semiconductor body with a plurality of spaced apart first and second electrical contacts on respective opposed surfaces of the body, thereby forming a plurality of photovoltaic cells with the cells series-connected to provide a higher output voltage. The invention is a series-connected array wherein the series connection between a pair of adjacent photovoltaic cells comprises a plurality of openings extending through the semiconductor body with an electrical contact of one cell extending into the plurality of openings to provide a connection with an opposed electrical contact of the next adjacent cell.

Abstract: An improvement in the rapid alloying of aluminum metallization on a silicon substrate is provided. The structure is heated to alloying temperature for under a minute in a suitable heating means in a reducing atmosphere and rapidly cooled to under 200.degree. C. in not longer than about one minute after cessation of heating. A preferred reducing atmosphere is forming gas.

Abstract: The formation of silicon dioxide isolated silicon islands on the surface of a substrate is improved by utilizing as an oxidation mask a patterned layer of silicon nitride which is deposited by LPCVD directly onto the surface of the silicon wafer. The subject method substantially reduces the incidence of stress related defects in the silicon surface and therefore eliminates the need for a layer of pad oxide which, if present, would cause "bird's beak" formation.

Abstract: A laminated recorded disc of the type having a core material surrounded by a surface layer of a conductive material is made from a preform having a core surrounded by the conductive material. The preform is made in a mold in which the conductive material is first injected into the mold and then the core material is injected into the conductive material. The disc is made from the preform by placing the preform between the platens of a compression mold and closing the heated platens against the preform. The heated platens heat and apply pressure to the preform to cause the materials of the preform to flow radially outwardly until the materials fill the mold cavity formed by the completely closed platens.

Abstract: An optical recording medium comprising a substrate, a light absorptive layer overlying the substrate, a buffer layer overlying the absorptive layer and a masking layer having slots therethrough overlying the buffer layer. The invention also includes an information record having information recorded in the absorptive layer as a series of regions of the absorptive layer, underlying the slots in the masking layer, whose optical properties differ from those of the remainder of the absorptive layer. The presence of the slots in this medium can provide a spatially varying recording sensitivity, track identification and a means for obtaining a radial tracking error signal.

Abstract: Video discs are dried by first spraying the surface with liquid fluorocarbon to remove water and heating the disc so as to prevent water condensation during evaporation of the fluorocarbon, preferably in a fluorocarbon vapor.

Abstract: An improved overcoated optical recording medium comprises a light absorptive layer and an overcoat overlying the absorptive layer wherein the overcoat has a plurality of indentations in the surface which contacts the absorptive layer thereby forming a first region of the recording medium wherein the overcoat layer does not contact the absorptive layer and a second region wherein the overcoat layer does contact the absorptive layer. The recording sensitivity in the first region is greater since the heat loss to the overcoat layer in these regions is reduced and the mechanical constraints on the formation of deformations in the absorptive layer are relaxed. The invention also includes an improved information record having information recorded in a portion of the first region as a change in the local optical properties.

Abstract: A process for defining improved tapered contact openings in glass coatings comprising the deposition of a layer of low temperature flowable passivating glass and the deposition of a masking layer to initially approximately define contact areas over portions of the active regions and over portions of a gate line. The first contact openings are then etched and the passivating layer caused to reflow followed by a second etch, in the previously etched areas, which second etch accurately defines the contact openings. The final etch rounds off any corners produced by the second etch to produce smoothly tapered contact openings. .circle.

Abstract: A workpiece loader includes a processing tray having two parallel sets of substantially V-shaped grooves adjacent a surface thereof, the grooves of one set alternating with and having a depth greater than the depth of the grooves of the other set. The workpiece loader further comprises an aligning tray having a plurality of substantially V-shaped grooves adjacent a surface thereof and parallel to each other, the grooves of the aligning tray having a depth greater than the depth of the grooves of the other set and having a periodicity equal to the periodicity of the grooves of the other set, the aligning and processing trays being positioned in tandem so that the grooves of the other set are aligned with the grooves of the aligning tray.

Abstract: A method for the preparation of a mold for use in molding high density information discs includes treating the exposed surfaces of the mold with a solvent to remove any foreign matter therefrom. This step is followed by treating the exposed surfaces of the mold with a cleaning and drying agent to remove any remaining solvent. This is followed by applying a coating of an antistatic agent to the surfaces of the mold. The method is completed by applying a coating of a mold lubricant to the surfaces of the mold.

Abstract: An improved apparatus and method of molding a high density information disc which includes maintaining the molding composition at an elevated temperature between the extrusion step and the record pressing step, such that the resultant disc is of improved quality. A heated shot cup is provided to maintain the extruded molding composition at the elevated temperature and in which the same is molded into a preform from which the disc is pressed.

Abstract: Polyvinyl chloride base molding compositions containing conductive carbon particles which have been treated with a fatty acid chloride have reduced melt viscosities, improved processabilities, and increased electrical conductivities, as well as improved dispersion of the carbon particles in the molding compositions. High density information discs having improved playback performance can be readily molded from these compositions.

Abstract: A method of applying thin metal sensitizing deposits to the exposed silicon areas of a silicon substrate having areas of exposed silicon and silicon oxide, including the steps of immersing the silicon substrate in a basic, aqueous solution containing a metal salt of the metal to be deposited, particularly a nickel, cobalt, or platinum salt, and thereafter reducing the metal ion of the salt to the elemental metal by use of the exposed silicon as the reducing agent.

Abstract: An etching solution for etching composite structures of silicon nitride on silicon oxide on silicon substrates which etches the silicon nitride at a rate equal to or faster than the silicon oxide which comprises concentrated aqueous hydrogen fluoride in a high boiling, organic solvent.

Abstract: Video disc nickel stampers are coated with a very thin, e.g., 100-250 angstroms, non-grainy layer of chromium which imparts increased scratch resistance to carbon-filled polyvinylchloride resins during compression molding.

Abstract: A method of fabricating a low-resistivity polycrystalline silicon film deposited on a substrate comprises the steps of doping the polycrystalline silicon film with boron in situ while depositing the film, to a concentration greater than 1.times.10.sup.20 atoms/cm.sup.3, and then irradiating the film with a laser pulse. The present method may be utilized to fabricate a polycrystalline silicon film having a relatively small temperature coefficient of resistivity by electrically connecting a first irradiated part of the film with a second non-irradiated part in a manner allowing the two parts, having different temperature coefficients of resistivity, to compensate each other.

Abstract: A method of passivating a silicon semiconductor device having at least one active component disposed in a crystalline region thereof comprises the steps of bombarding a surface of the crystalline region with ions to convert a part of the region adjacent the surface into an amorphous layer of graded crystallinity, and then exposing the amorphous layer to atomic hydrogen, whereby an integral layer of hydrogenated amorphous silicon is formed adjacent the crystalline region.