Abstract: An improved method of forming a multicolor cathode-ray tube display screen to minimize phosphor contamination. A light-absorbing matrix is first formed on the inner surface of a CRT faceplate, preferably by photoetching of a substantially black metallic layer. Then, multiple color dot patterns are deposited in the matrix openings by (a) depositing a layer of positive photoresist on the matrix and any previously-deposited dot pattern; (b) exposing the resist through a shadow mask to light from a point source positioned to simulate an electron gun; (c) developing the resist to form an integral mask containing a pattern of holes aligned with the matrix openings for one color phosphor; (d) coating the developed resist layer with a photohardenable phosphor slurry; (e) exposing the slurry coating through the faceplate to light from a diffuse source; (f) developing the slurry to remove the unexposed portions, leaving a pattern of dots of one color; and (g) stripping away the photoresist masking layer.

Abstract: A single pass multicolor thermal transfer printer for recording color images on plain paper by transferring spots of different colored materials from a carrier sheet as it and a sheet of paper are moved across a printhead in contiguous relation. The printhead includes a plurality of individual thermal elements that are selectively energized in timed relation to transfer colored materials from discrete areas of the carrier to the paper as the sheets pass over the printhead. The carrier includes separate, repeating patterns of four different color materials--three primary colors plus black--permitting the formation of multicolor images by energizing the appropriate elements as areas of the desired color materials are moved into registration with them.

Abstract: An improved erase cycle for direct-viewing bistable storage tubes that substantially eliminates the bright flash characteristic of conventional erasure methods. As applied to the backplate of a meshless storage tube, the improved cycle suitably comprises two or more short (about 2 to 10 ms) fade positive pulses separated by a negative, decaying recovery pulse about 50-100 ms in length and optionally, a "dead time" of about 200 ms at the target operating level. The final fade positive pulse is followed by a longer recovery interval that gradually increases the backplate voltage to its previous operating level while the flood guns retain the storage phosphor in an erased, unwritten condition.

Abstract: An improved, ultra high speed (2GHz) CMOS inverter structure comprising a double-diffused, planar p-channel transistor and a nonplanar n-channel transistor formed within adjacent surface fields on the same substrate. The n-channel device includes a source region formed in an elevated, plateau region on the substrate, and a narrow, implanted channel-forming layer that extends through the plateau beneath the source region and terminates at a slope joining the plateau to surrounding lower elevation portions of the substrate. A drain region is formed adjacent the foot of the slope, spaced from the channel to provide a drift region between them.

Abstract: An improved, high speed n-channel MOS inverter structure including a self-aligned silicon gate depletion-mode load device integrated in series with a nonplanar, submicron channel enhancement-mode switching transistor. The enhancement-mode switching device is formed on a field of the substrate that includes an elevated, plateau region joined to a surrounding planar area by a slope. The MOS load transistor is formed on an adjoining planar portion of the surface. The process for fabricating the devices features successive ion implation of boron and arsenic through an oxide layer that includes a smoothly tapered "beak" formed by a local oxidation technique.

Abstract: An improved method of screening a color cathode ray tube of the shadow mask type is disclosed. The shadow mask is used to form a corresponding virtual mask on the outer or viewing surface of the CRT faceplate. The virtual mask then is employed as a substitute for the shadow mask in the subsequent photoprinting of a color display screen on the faceplates's inner surface. Advantages include reduced handling of the fragile shadow mask, which reduces the costs associated with replacing such masks if they become damaged, and better defined and registered phosphor deposits.

Abstract: Microcircuit structures including thin-film electrical components are provided with a multilayer passivation coating that permits laser trimming of the components through the coating without damaging it. Such a passivation coating suitably includes an underlayer of silicon oxide or other oxygen-containing material and an outer layer of silicon nitride.

Abstract: Improved, high performance MOS transistors are provided by a method that includes providing an oxygen-impermeable mask on a selected region of a semiconductor substrate, oxidizing the unmasked portion of the surface to provide a thick oxide at least partially recessed in the substrate, which layer includes a smoothly tapered beak that extends between the margin of the mask and the underlying silicon surface, and, after removing the mask, implanting a selected impurity in the substrate beneath the selected region to form a thin impurity layer that terminates at a sloped portion of the substrate formed by the oxidation step.

Abstract: Multilayer circuit boards having large area through-hole electrical connections are provided by a process that begins with the fabrication by known means of a drilled and through-hole plated single layer board. Next, a layer of insulating material is applied to either side of the board, leaving at least the through-hole plating exposed. A continuous layer of metal is then deposited on the body, completely covering the insulating layer and through-hole plating. Finally, the deposited metal layer is selectively masked and etched to form conductive circuit patterns on the insulating layer, overlying the original circuit patterns and electrically connected to them by the multiple layer through-hole plating.

Abstract: A modular form of construction for electrical probes featuring releasably interconnected, standardized modules that can be individually replaced in the field. Included are a modular probe head, a probe cable, and both releasably locking and non-locking output terminations, including a panel mounting termination for inclusion in an electrical instrument.

Abstract: An electron beam deflection structure for a high frequency cathode-ray tube incorporates a meanderline slow wave circuit that is supported directly by the same glass rods used to support other portions of the CRT's beam forming and deflection system. To accomplish this, elongate loops that serially interconnect a plurality of deflection plate segments are bent away from the plane of the segments (and the beam axis) and joined by integral support strips to the rods. The elimination of a separate support structure for the deflectors greatly reduces manufacturing costs.

Abstract: A switch apparatus is provided which closely approximates transmission medium parameters for reducing impedance discontinuities by utilizing a high frequency contact arrangement permitting high bandwidth operation. The apparatus is adaptable for use with both high and low impedance circuitry.

Abstract: An improved resistance-type sensor for an electrical temperature probe includes a thin-film platinum resistor deposited on an oxidized silicon chip. The chip is eutectically bonded to the planar reverse side of a beryllium oxide tip-piece having a hemispherical face adapted for contacting the surface of an object being measured. The tip-piece is set in a thermal insulating plastic mount, spaced from a pair of low resistance electrical leads held by the mount. Very fine wires bonded between the leads and platinum resistor form high thermal impedance electrical connections to the temperature-sensing element.

Abstract: A storage target for a cathode ray tube is formed by adhering a layer of glass to the rear of a glass faceplate and etching depressions or apertures in such layer. Secondary emissive dielectric or phosphor material applied in these depressions will have uniform depth and therefore uniform storage properties. A storage target according to the present invention is provided with a collector on the glass layer between the apertures therein, as well as with an undercollector between the glass layer and the faceplate.

Abstract: An improved shaft-operated rotary switch construction for printed circuitry applications is disclosed. The improved switch is a modular design incorporating a standardized rotor element accommodating the mounting of wiper contacts in different positions and different operational orientations. Also disclosed is an improved releasable clutch mechanism providing one mode of operation in which the rotors of different switch sections are coupled together for simultaneous rotation, and another mode in which they are rotatable independently, the operating mode being selected by axial movement of one section's operating shaft relative to that of the other.

Abstract: An electron beam scan conversion method and apparatus based on the gain recovery or "dead" time characteristic of channel electron multipliers. The waveform of an electrical signal is written on the input face of a channel multiplier plate with an electron beam. Then, within the dead time of the written channels (typically about 1-100 msec.), the plate's input face is scanned in a predetermined raster pattern with a constant current beam. During the scanning step, an output signal is derived that corresponds to the difference in emission in response to the scanning beam between the channels in the written area of the plate and those outside that area.

Abstract: A cathode ray tube is provided with a rectangular box-shaped lens intermediate the tube's screen and beam deflection plates for amplifying beam deflections in both the horizontal and vertical axes. In one form, useful in either monoaccelerator or PDA tubes, the lens includes four tubular elements disposed end-to-end and spaced apart a sufficient distance to isolate them electrically. The adjacent ends of each pair of the elements are oppositely curved to provide electron lenses having vertical cylindrical mid-surfaces. The radii of the cylindrical surfaces and the voltages applied to each element are adjusted to provide a lens system that produces minimum distortion and optimum linearity in the resultant display.

Abstract: An electrical signal transmission line connector having a switch-selectable termination resistor within the connector body. Use of the connector at the output of a signal acquisition probe allows it to be used with electrical instruments, such as oscilloscopes, having different input impedances.

Abstract: A lightweight stand that attaches to the bottom of a portable electronic instrument, such as an oscilloscope. Used in one assembled form to support the instrument at a convenient, working height and attitude, the stand can be dismantled easily and reassembled in compact, self-contained form for transit or storage.

Abstract: A light actuated switch apparatus is described in which no movable switch contacts are employed. The switch uses a light source and shutter to activate an array of light sensitive devices to generate a binary code that provides the switching function. One embodiment of the switch apparatus is employed inside a control knob providing a binary code generated by shutter action of a light source on an array of photo-transistors. Another embodiment .[.employes.]. .Iadd.employs .Iaddend.the above control knob including switch apparatus as well as a second knob and printed board to form a dual switch apparatus. As no switch contacts are employed there is considerable reduction in electrical components. Additionally, this also greatly reduces the space required for mounting the switch, is readily serviceable or replaceable as no parts are located within an instrument, and is less expensive as no contacts eliminate any wear and potential problems associated with movable through stationary contacts.